xserver git update 19/10/2010

1 files changed, 2399 insertions, 2399 deletions

diff --git a/xorg-server/Xext/sync.c b/xorg-server/Xext/sync.c
index 8faab0d1d..d46087a68 100644
--- a/xorg-server/Xext/sync.c
+++ b/xorg-server/Xext/sync.c
@@ -1,2399 +1,2399 @@
-/*

-

-Copyright 1991, 1993, 1998  The Open Group

-

-Permission to use, copy, modify, distribute, and sell this software and its

-documentation for any purpose is hereby granted without fee, provided that

-the above copyright notice appear in all copies and that both that

-copyright notice and this permission notice appear in supporting

-documentation.

-

-The above copyright notice and this permission notice shall be included

-in all copies or substantial portions of the Software.

-

-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

-OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

-IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR

-OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

-ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

-OTHER DEALINGS IN THE SOFTWARE.

-

-Except as contained in this notice, the name of The Open Group shall

-not be used in advertising or otherwise to promote the sale, use or

-other dealings in this Software without prior written authorization

-from The Open Group.

-

-

-Copyright 1991, 1993 by Digital Equipment Corporation, Maynard, Massachusetts,

-and Olivetti Research Limited, Cambridge, England.

-

-                        All Rights Reserved

-

-Permission to use, copy, modify, and distribute this software and its

-documentation for any purpose and without fee is hereby granted,

-provided that the above copyright notice appear in all copies and that

-both that copyright notice and this permission notice appear in

-supporting documentation, and that the names of Digital or Olivetti

-not be used in advertising or publicity pertaining to distribution of the

-software without specific, written prior permission.  Digital and Olivetti

-make no representations about the suitability of this software

-for any purpose.  It is provided "as is" without express or implied warranty.

-

-DIGITAL AND OLIVETTI DISCLAIM ALL WARRANTIES WITH REGARD TO THIS

-SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND

-FITNESS, IN NO EVENT SHALL THEY BE LIABLE FOR ANY SPECIAL, INDIRECT OR

-CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF

-USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR

-OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR

-PERFORMANCE OF THIS SOFTWARE.

-

-*/

-

-#ifdef HAVE_DIX_CONFIG_H

-#include <dix-config.h>

-#endif

-

-#include <string.h>

-

-#include <X11/X.h>

-#include <X11/Xproto.h>

-#include <X11/Xmd.h>

-#include "misc.h"

-#include "os.h"

-#include "extnsionst.h"

-#include "dixstruct.h"

-#include "resource.h"

-#include "opaque.h"

-#include <X11/extensions/syncproto.h>

-#include "syncsrv.h"

-

-#include <stdio.h>

-#if !defined(WIN32)

-#include <sys/time.h>

-#endif

-

-#include "modinit.h"

-

-/*

- * Local Global Variables

- */

-static int      SyncEventBase;

-static int      SyncErrorBase;

-static RESTYPE  RTCounter = 0;

-static RESTYPE  RTAwait;

-static RESTYPE  RTAlarm;

-static RESTYPE  RTAlarmClient;

-static int SyncNumSystemCounters = 0;

-static SyncCounter **SysCounterList = NULL;

-

-#define IsSystemCounter(pCounter) \

-    (pCounter && (pCounter->client == NULL))

-

-/* these are all the alarm attributes that pertain to the alarm's trigger */

-#define XSyncCAAllTrigger \

-    (XSyncCACounter | XSyncCAValueType | XSyncCAValue | XSyncCATestType)

-

-static void SyncComputeBracketValues(SyncCounter *);

-

-static void SyncInitServerTime(void);

-

-static void SyncInitIdleTime(void);

-

-static DISPATCH_PROC(ProcSyncAwait);

-static DISPATCH_PROC(ProcSyncChangeAlarm);

-static DISPATCH_PROC(ProcSyncChangeCounter);

-static DISPATCH_PROC(ProcSyncCreateAlarm);

-static DISPATCH_PROC(ProcSyncCreateCounter);

-static DISPATCH_PROC(ProcSyncDestroyAlarm);

-static DISPATCH_PROC(ProcSyncDestroyCounter);

-static DISPATCH_PROC(ProcSyncDispatch);

-static DISPATCH_PROC(ProcSyncGetPriority);

-static DISPATCH_PROC(ProcSyncInitialize);

-static DISPATCH_PROC(ProcSyncListSystemCounters);

-static DISPATCH_PROC(ProcSyncQueryAlarm);

-static DISPATCH_PROC(ProcSyncQueryCounter);

-static DISPATCH_PROC(ProcSyncSetCounter);

-static DISPATCH_PROC(ProcSyncSetPriority);

-static DISPATCH_PROC(SProcSyncAwait);

-static DISPATCH_PROC(SProcSyncChangeAlarm);

-static DISPATCH_PROC(SProcSyncChangeCounter);

-static DISPATCH_PROC(SProcSyncCreateAlarm);

-static DISPATCH_PROC(SProcSyncCreateCounter);

-static DISPATCH_PROC(SProcSyncDestroyAlarm);

-static DISPATCH_PROC(SProcSyncDestroyCounter);

-static DISPATCH_PROC(SProcSyncDispatch);

-static DISPATCH_PROC(SProcSyncGetPriority);

-static DISPATCH_PROC(SProcSyncInitialize);

-static DISPATCH_PROC(SProcSyncListSystemCounters);

-static DISPATCH_PROC(SProcSyncQueryAlarm);

-static DISPATCH_PROC(SProcSyncQueryCounter);

-static DISPATCH_PROC(SProcSyncSetCounter);

-static DISPATCH_PROC(SProcSyncSetPriority);

-

-/*  Each counter maintains a simple linked list of triggers that are

- *  interested in the counter.  The two functions below are used to

- *  delete and add triggers on this list.

- */

-static void

-SyncDeleteTriggerFromCounter(SyncTrigger *pTrigger)

-{

-    SyncTriggerList *pCur;

-    SyncTriggerList *pPrev;

-

-    /* pCounter needs to be stored in pTrigger before calling here. */

-

-    if (!pTrigger->pCounter)

-	return;

-

-    pPrev = NULL;

-    pCur = pTrigger->pCounter->pTriglist;

-

-    while (pCur)

-    {

-	if (pCur->pTrigger == pTrigger)

-	{

-	    if (pPrev)

-		pPrev->next = pCur->next;

-	    else

-		pTrigger->pCounter->pTriglist = pCur->next;

-

-	    free(pCur);

-	    break;

-	}

-	

-	pPrev = pCur;

-	pCur = pCur->next;

-    }

-

-    if (IsSystemCounter(pTrigger->pCounter))

-	SyncComputeBracketValues(pTrigger->pCounter);

-}

-

-

-static int

-SyncAddTriggerToCounter(SyncTrigger *pTrigger)

-{

-    SyncTriggerList *pCur;

-

-    if (!pTrigger->pCounter)

-	return Success;

-

-    /* don't do anything if it's already there */

-    for (pCur = pTrigger->pCounter->pTriglist; pCur; pCur = pCur->next)

-    {

-	if (pCur->pTrigger == pTrigger)

-	    return Success;

-    }

-

-    if (!(pCur = malloc(sizeof(SyncTriggerList))))

-	return BadAlloc;

-

-    pCur->pTrigger = pTrigger;

-    pCur->next = pTrigger->pCounter->pTriglist;

-    pTrigger->pCounter->pTriglist = pCur;

-

-    if (IsSystemCounter(pTrigger->pCounter))

-	SyncComputeBracketValues(pTrigger->pCounter);

-

-    return Success;

-}

-

-

-/*  Below are four possible functions that can be plugged into

- *  pTrigger->CheckTrigger, corresponding to the four possible

- *  test-types.  These functions are called after the counter's

- *  value changes but are also passed the old counter value

- *  so they can inspect both the old and new values.

- *  (PositiveTransition and NegativeTransition need to see both

- *  pieces of information.)  These functions return the truth value

- *  of the trigger.

- *

- *  All of them include the condition pTrigger->pCounter == NULL.

- *  This is because the spec says that a trigger with a counter value

- *  of None is always TRUE.

- */

-

-static Bool

-SyncCheckTriggerPositiveComparison(SyncTrigger *pTrigger, CARD64 oldval)

-{

-    return (pTrigger->pCounter == NULL ||

-	    XSyncValueGreaterOrEqual(pTrigger->pCounter->value,

-				     pTrigger->test_value));

-}

-

-static Bool

-SyncCheckTriggerNegativeComparison(SyncTrigger *pTrigger,  CARD64 oldval)

-{

-    return (pTrigger->pCounter == NULL ||

-	    XSyncValueLessOrEqual(pTrigger->pCounter->value,

-				  pTrigger->test_value));

-}

-

-static Bool

-SyncCheckTriggerPositiveTransition(SyncTrigger *pTrigger, CARD64 oldval)

-{

-    return (pTrigger->pCounter == NULL ||

-	    (XSyncValueLessThan(oldval, pTrigger->test_value) &&

-	     XSyncValueGreaterOrEqual(pTrigger->pCounter->value,

-				      pTrigger->test_value)));

-}

-

-static Bool

-SyncCheckTriggerNegativeTransition(SyncTrigger *pTrigger, CARD64 oldval)

-{

-    return (pTrigger->pCounter == NULL ||

-	    (XSyncValueGreaterThan(oldval, pTrigger->test_value) &&

-	     XSyncValueLessOrEqual(pTrigger->pCounter->value,

-				   pTrigger->test_value)));

-}

-

-static int

-SyncInitTrigger(ClientPtr client, SyncTrigger *pTrigger, XSyncCounter counter,

-		Mask changes)

-{

-    SyncCounter *pCounter = pTrigger->pCounter;

-    int		rc;

-    Bool	newcounter = FALSE;

-

-    if (changes & XSyncCACounter)

-    {

-	if (counter == None)

-	    pCounter = NULL;

-	else if (Success != (rc = dixLookupResourceByType ((pointer *)&pCounter,

-				counter, RTCounter, client, DixReadAccess)))

-	{

-	    client->errorValue = counter;

-	    return (rc == BadValue) ? SyncErrorBase + XSyncBadCounter : rc;

-	}

-	if (pCounter != pTrigger->pCounter)

-	{ /* new counter for trigger */

-	    SyncDeleteTriggerFromCounter(pTrigger);

-	    pTrigger->pCounter = pCounter;

-	    newcounter = TRUE;

-	}

-    }

-

-    /* if system counter, ask it what the current value is */

-

-    if (IsSystemCounter(pCounter))

-    {

-	(*pCounter->pSysCounterInfo->QueryValue) ((pointer) pCounter,

-						  &pCounter->value);

-    }

-

-    if (changes & XSyncCAValueType)

-    {

-	if (pTrigger->value_type != XSyncRelative &&

-	    pTrigger->value_type != XSyncAbsolute)

-	{

-	    client->errorValue = pTrigger->value_type;

-	    return BadValue;

-	}

-    }

-

-    if (changes & XSyncCATestType)

-    {

-	if (pTrigger->test_type != XSyncPositiveTransition &&

-	    pTrigger->test_type != XSyncNegativeTransition &&

-	    pTrigger->test_type != XSyncPositiveComparison &&

-	    pTrigger->test_type != XSyncNegativeComparison)

-	{

-	    client->errorValue = pTrigger->test_type;

-	    return BadValue;

-	}

-	/* select appropriate CheckTrigger function */

-

-	switch (pTrigger->test_type)

-	{

-        case XSyncPositiveTransition:

-	    pTrigger->CheckTrigger = SyncCheckTriggerPositiveTransition;

-	    break;

-        case XSyncNegativeTransition:

-	    pTrigger->CheckTrigger = SyncCheckTriggerNegativeTransition;

-	    break;

-        case XSyncPositiveComparison:

-	    pTrigger->CheckTrigger = SyncCheckTriggerPositiveComparison;

-	    break;

-        case XSyncNegativeComparison:

-	    pTrigger->CheckTrigger = SyncCheckTriggerNegativeComparison;

-	    break;

-	}

-    }

-

-    if (changes & (XSyncCAValueType | XSyncCAValue))

-    {

-	if (pTrigger->value_type == XSyncAbsolute)

-	    pTrigger->test_value = pTrigger->wait_value;

-	else /* relative */

-	{

-	    Bool overflow;

-	    if (pCounter == NULL)

-		return BadMatch;

-

-	    XSyncValueAdd(&pTrigger->test_value, pCounter->value,

-			  pTrigger->wait_value, &overflow);

-	    if (overflow)

-	    {

-		client->errorValue = XSyncValueHigh32(pTrigger->wait_value);

-		return BadValue;

-	    }

-	}

-    }

-

-    /*  we wait until we're sure there are no errors before registering

-     *  a new counter on a trigger

-     */

-    if (newcounter)

-    {

-	if ((rc = SyncAddTriggerToCounter(pTrigger)) != Success)

-	    return rc;

-    }

-    else if (IsSystemCounter(pCounter))

-    {

-	SyncComputeBracketValues(pCounter);

-    }

-

-    return Success;

-}

-

-/*  AlarmNotify events happen in response to actions taken on an Alarm or

- *  the counter used by the alarm.  AlarmNotify may be sent to multiple

- *  clients.  The alarm maintains a list of clients interested in events.

- */

-static void

-SyncSendAlarmNotifyEvents(SyncAlarm *pAlarm)

-{

-    SyncAlarmClientList *pcl;

-    xSyncAlarmNotifyEvent ane;

-    SyncTrigger *pTrigger = &pAlarm->trigger;

-

-    UpdateCurrentTime();

-

-    ane.type = SyncEventBase + XSyncAlarmNotify;

-    ane.kind = XSyncAlarmNotify;

-    ane.sequenceNumber = pAlarm->client->sequence;

-    ane.alarm = pAlarm->alarm_id;

-    if (pTrigger->pCounter)

-    {

-	ane.counter_value_hi = XSyncValueHigh32(pTrigger->pCounter->value);

-	ane.counter_value_lo = XSyncValueLow32(pTrigger->pCounter->value);

-    }

-    else

-    { /* XXX what else can we do if there's no counter? */

-	ane.counter_value_hi = ane.counter_value_lo = 0;

-    }

-

-    ane.alarm_value_hi = XSyncValueHigh32(pTrigger->test_value);

-    ane.alarm_value_lo = XSyncValueLow32(pTrigger->test_value);

-    ane.time = currentTime.milliseconds;

-    ane.state = pAlarm->state;

-

-    /* send to owner */

-    if (pAlarm->events && !pAlarm->client->clientGone)

-	WriteEventsToClient(pAlarm->client, 1, (xEvent *) &ane);

-

-    /* send to other interested clients */

-    for (pcl = pAlarm->pEventClients; pcl; pcl = pcl->next)

-    {

-	if (!pAlarm->client->clientGone)

-	{

-	    ane.sequenceNumber = pcl->client->sequence;

-	    WriteEventsToClient(pcl->client, 1, (xEvent *) &ane);

-	}

-    }

-}

-

-

-/*  CounterNotify events only occur in response to an Await.  The events

- *  go only to the Awaiting client.

- */

-static void

-SyncSendCounterNotifyEvents(ClientPtr client, SyncAwait **ppAwait,

-			    int num_events)

-{

-    xSyncCounterNotifyEvent *pEvents, *pev;

-    int i;

-

-    if (client->clientGone)

-	return;

-    pev = pEvents = malloc(num_events * sizeof(xSyncCounterNotifyEvent));

-    if (!pEvents)

-	return;

-    UpdateCurrentTime();

-    for (i = 0; i < num_events; i++, ppAwait++, pev++)

-    {

-	SyncTrigger *pTrigger = &(*ppAwait)->trigger;

-	pev->type = SyncEventBase + XSyncCounterNotify;

-	pev->kind = XSyncCounterNotify;

-	pev->sequenceNumber = client->sequence;

-	pev->counter = pTrigger->pCounter->id;

-	pev->wait_value_lo = XSyncValueLow32(pTrigger->test_value);

-	pev->wait_value_hi = XSyncValueHigh32(pTrigger->test_value);

-	pev->counter_value_lo = XSyncValueLow32(pTrigger->pCounter->value);

-	pev->counter_value_hi = XSyncValueHigh32(pTrigger->pCounter->value);

-	pev->time = currentTime.milliseconds;

-	pev->count = num_events - i - 1; /* events remaining */

-	pev->destroyed = pTrigger->pCounter->beingDestroyed;

-    }

-    /* swapping will be taken care of by this */

-    WriteEventsToClient(client, num_events, (xEvent *)pEvents);

-    free(pEvents);

-}

-

-

-/* This function is called when an alarm's counter is destroyed.

- * It is plugged into pTrigger->CounterDestroyed (for alarm triggers).

- */

-static void

-SyncAlarmCounterDestroyed(SyncTrigger *pTrigger)

-{

-    SyncAlarm *pAlarm = (SyncAlarm *)pTrigger;

-

-    pAlarm->state = XSyncAlarmInactive;

-    SyncSendAlarmNotifyEvents(pAlarm);

-    pTrigger->pCounter = NULL;

-}

-

-

-/*  This function is called when an alarm "goes off."

- *  It is plugged into pTrigger->TriggerFired (for alarm triggers).

- */

-static void

-SyncAlarmTriggerFired(SyncTrigger *pTrigger)

-{

-    SyncAlarm *pAlarm = (SyncAlarm *)pTrigger;

-    CARD64 new_test_value;

-

-    /* no need to check alarm unless it's active */

-    if (pAlarm->state != XSyncAlarmActive)

-	return;

-

-    /*  " if the counter value is None, or if the delta is 0 and

-     *    the test-type is PositiveComparison or NegativeComparison,

-     *    no change is made to value (test-value) and the alarm

-     *    state is changed to Inactive before the event is generated."

-     */

-    if (pAlarm->trigger.pCounter == NULL

-	|| (XSyncValueIsZero(pAlarm->delta)

-	    && (pAlarm->trigger.test_type == XSyncPositiveComparison

-		|| pAlarm->trigger.test_type == XSyncNegativeComparison)))

-	pAlarm->state = XSyncAlarmInactive;

-

-    new_test_value = pAlarm->trigger.test_value;

-

-    if (pAlarm->state == XSyncAlarmActive)

-    {

-	Bool overflow;

-	CARD64 oldvalue;

-	SyncTrigger *paTrigger = &pAlarm->trigger;

-

-	/* "The alarm is updated by repeatedly adding delta to the

-	 *  value of the trigger and re-initializing it until it

-	 *  becomes FALSE."

-	 */

-	oldvalue = paTrigger->test_value;

-

-	/* XXX really should do something smarter here */

-

-	do

-	{

-	    XSyncValueAdd(&paTrigger->test_value, paTrigger->test_value,

-			  pAlarm->delta, &overflow);

-	} while (!overflow &&

-	      (*paTrigger->CheckTrigger)(paTrigger,

-					paTrigger->pCounter->value));

-

-	new_test_value = paTrigger->test_value;

-	paTrigger->test_value = oldvalue;

-

-	/* "If this update would cause value to fall outside the range

-	 *  for an INT64...no change is made to value (test-value) and

-	 *  the alarm state is changed to Inactive before the event is

-	 *  generated."

-	 */

-	if (overflow)

-	{

-	    new_test_value = oldvalue;

-	    pAlarm->state = XSyncAlarmInactive;

-	}

-    }

-    /*  The AlarmNotify event has to have the "new state of the alarm"

-     *  which we can't be sure of until this point.  However, it has

-     *  to have the "old" trigger test value.  That's the reason for

-     *  all the newvalue/oldvalue shuffling above.  After we send the

-     *  events, give the trigger its new test value.

-     */

-    SyncSendAlarmNotifyEvents(pAlarm);

-    pTrigger->test_value = new_test_value;

-}

-

-

-/*  This function is called when an Await unblocks, either as a result

- *  of the trigger firing OR the counter being destroyed.

- *  It goes into pTrigger->TriggerFired AND pTrigger->CounterDestroyed

- *  (for Await triggers).

- */

-static void

-SyncAwaitTriggerFired(SyncTrigger *pTrigger)

-{

-    SyncAwait *pAwait = (SyncAwait *)pTrigger;

-    int numwaits;

-    SyncAwaitUnion *pAwaitUnion;

-    SyncAwait **ppAwait;

-    int num_events = 0;

-

-    pAwaitUnion = (SyncAwaitUnion *)pAwait->pHeader;

-    numwaits = pAwaitUnion->header.num_waitconditions;

-    ppAwait = malloc(numwaits * sizeof(SyncAwait *));

-    if (!ppAwait)

-	goto bail;

-

-    pAwait = &(pAwaitUnion+1)->await;

-

-    /* "When a client is unblocked, all the CounterNotify events for

-     *  the Await request are generated contiguously. If count is 0

-     *  there are no more events to follow for this request. If

-     *  count is n, there are at least n more events to follow."

-     *

-     *  Thus, it is best to find all the counters for which events

-     *  need to be sent first, so that an accurate count field can

-     *  be stored in the events.

-     */

-    for ( ; numwaits; numwaits--, pAwait++)

-    {

-	CARD64 diff;

-	Bool overflow, diffgreater, diffequal;

-

-	/* "A CounterNotify event with the destroyed flag set to TRUE is

-	 *  always generated if the counter for one of the triggers is

-	 *  destroyed."

-	 */

-	if (pAwait->trigger.pCounter->beingDestroyed)

-	{

-	    ppAwait[num_events++] = pAwait;

-	    continue;

-	}

-

-	/* "The difference between the counter and the test value is

-	 *  calculated by subtracting the test value from the value of

-	 *  the counter."

-	 */

-	XSyncValueSubtract(&diff, pAwait->trigger.pCounter->value,

-			   pAwait->trigger.test_value, &overflow);

-

-	/* "If the difference lies outside the range for an INT64, an

-	 *  event is not generated."

-	 */

-	if (overflow)

-	    continue;

-	diffgreater = XSyncValueGreaterThan(diff, pAwait->event_threshold);

-	diffequal   = XSyncValueEqual(diff, pAwait->event_threshold);

-

-	/* "If the test-type is PositiveTransition or

-	 *  PositiveComparison, a CounterNotify event is generated if

-	 *  the difference is at least event-threshold. If the test-type

-	 *  is NegativeTransition or NegativeComparison, a CounterNotify

-	 *  event is generated if the difference is at most

-	 *  event-threshold."

-	 */

-

-	if ( ((pAwait->trigger.test_type == XSyncPositiveComparison ||

-	       pAwait->trigger.test_type == XSyncPositiveTransition)

-	       && (diffgreater || diffequal))

-	     ||

-	     ((pAwait->trigger.test_type == XSyncNegativeComparison ||

-	       pAwait->trigger.test_type == XSyncNegativeTransition)

-	      && (!diffgreater) /* less or equal */

-	      )

-	   )

-	{

-	    ppAwait[num_events++] = pAwait;

-	}

-    }

-    if (num_events)

-	SyncSendCounterNotifyEvents(pAwaitUnion->header.client, ppAwait,

-				    num_events);

-    free(ppAwait);

-

-bail:

-    /* unblock the client */

-    AttendClient(pAwaitUnion->header.client);

-    /* delete the await */

-    FreeResource(pAwaitUnion->header.delete_id, RT_NONE);

-}

-

-

-/*  This function should always be used to change a counter's value so that

- *  any triggers depending on the counter will be checked.

- */

-void

-SyncChangeCounter(SyncCounter *pCounter, CARD64 newval)

-{

-    SyncTriggerList       *ptl, *pnext;

-    CARD64 oldval;

-

-    oldval = pCounter->value;

-    pCounter->value = newval;

-

-    /* run through triggers to see if any become true */

-    for (ptl = pCounter->pTriglist; ptl; ptl = pnext)

-    {

-	pnext = ptl->next;

-	if ((*ptl->pTrigger->CheckTrigger)(ptl->pTrigger, oldval))

-	    (*ptl->pTrigger->TriggerFired)(ptl->pTrigger);

-    }

-

-    if (IsSystemCounter(pCounter))

-    {

-	SyncComputeBracketValues(pCounter);

-    }

-}

-

-

-/* loosely based on dix/events.c/EventSelectForWindow */

-static Bool

-SyncEventSelectForAlarm(SyncAlarm *pAlarm, ClientPtr client, Bool wantevents)

-{

-    SyncAlarmClientList *pClients;

-

-    if (client == pAlarm->client) /* alarm owner */

-    {

-	pAlarm->events = wantevents;

-	return Success;

-    }

-

-    /* see if the client is already on the list (has events selected) */

-

-    for (pClients = pAlarm->pEventClients; pClients;

-	 pClients = pClients->next)

-    {

-	if (pClients->client == client)

-	{

-	    /* client's presence on the list indicates desire for

-	     * events.  If the client doesn't want events, remove it

-	     * from the list.  If the client does want events, do

-	     * nothing, since it's already got them.

-	     */

-	    if (!wantevents)

-	    {

-		FreeResource(pClients->delete_id, RT_NONE);

-	    }

-	    return Success;

-	}

-    }

-

-    /*  if we get here, this client does not currently have

-     *  events selected on the alarm

-     */

-

-    if (!wantevents)

-	/* client doesn't want events, and we just discovered that it

-	 * doesn't have them, so there's nothing to do.

-	 */

-	return Success;

-

-    /* add new client to pAlarm->pEventClients */

-

-    pClients = malloc(sizeof(SyncAlarmClientList));

-    if (!pClients)

-	return BadAlloc;

-

-    /*  register it as a resource so it will be cleaned up

-     *  if the client dies

-     */

-

-    pClients->delete_id = FakeClientID(client->index);

-    if (!AddResource(pClients->delete_id, RTAlarmClient, pAlarm))

-    {

-	free(pClients);

-	return BadAlloc;

-    }

-

-    /* link it into list after we know all the allocations succeed */

-

-    pClients->next = pAlarm->pEventClients;

-    pAlarm->pEventClients = pClients;

-    pClients->client = client;

-    return Success;

-}

-

-/*

- * ** SyncChangeAlarmAttributes ** This is used by CreateAlarm and ChangeAlarm

- */

-static int

-SyncChangeAlarmAttributes(ClientPtr client, SyncAlarm *pAlarm, Mask mask,

-			  CARD32 *values)

-{

-    int		   status;

-    XSyncCounter   counter;

-    Mask	   origmask = mask;

-

-    counter = pAlarm->trigger.pCounter ? pAlarm->trigger.pCounter->id : None;

-

-    while (mask)

-    {

-	int    index2 = lowbit(mask);

-	mask &= ~index2;

-	switch (index2)

-	{

-	  case XSyncCACounter:

-	    mask &= ~XSyncCACounter;

-	    /* sanity check in SyncInitTrigger */

-	    counter = *values++;

-	    break;

-

-	  case XSyncCAValueType:

-	    mask &= ~XSyncCAValueType;

-	    /* sanity check in SyncInitTrigger */

-	    pAlarm->trigger.value_type = *values++;

-	    break;

-

-	  case XSyncCAValue:

-	    mask &= ~XSyncCAValue;

-	    XSyncIntsToValue(&pAlarm->trigger.wait_value, values[1], values[0]);

-	    values += 2;

-	    break;

-

-	  case XSyncCATestType:

-	    mask &= ~XSyncCATestType;

-	    /* sanity check in SyncInitTrigger */

-	    pAlarm->trigger.test_type = *values++;

-	    break;

-

-	  case XSyncCADelta:

-	    mask &= ~XSyncCADelta;

-	    XSyncIntsToValue(&pAlarm->delta, values[1], values[0]);

-	    values += 2;

-	    break;

-

-	  case XSyncCAEvents:

-	    mask &= ~XSyncCAEvents;

-	    if ((*values != xTrue) && (*values != xFalse))

-	    {

-		client->errorValue = *values;

-		return BadValue;

-	    }

-	    status = SyncEventSelectForAlarm(pAlarm, client,

-					     (Bool)(*values++));

-	    if (status != Success)

-		return status;

-	    break;

-

-	  default:

-	    client->errorValue = mask;

-	    return BadValue;

-	}

-    }

-

-    /* "If the test-type is PositiveComparison or PositiveTransition

-     *  and delta is less than zero, or if the test-type is

-     *  NegativeComparison or NegativeTransition and delta is

-     *  greater than zero, a Match error is generated."

-     */

-    if (origmask & (XSyncCADelta|XSyncCATestType))

-    {

-	CARD64 zero;

-	XSyncIntToValue(&zero, 0);

-	if ((((pAlarm->trigger.test_type == XSyncPositiveComparison) ||

-	      (pAlarm->trigger.test_type == XSyncPositiveTransition))

-	     && XSyncValueLessThan(pAlarm->delta, zero))

-	    ||

-	    (((pAlarm->trigger.test_type == XSyncNegativeComparison) ||

-	      (pAlarm->trigger.test_type == XSyncNegativeTransition))

-	     && XSyncValueGreaterThan(pAlarm->delta, zero))

-	   )

-	{

-	    return BadMatch;

-	}

-    }

-

-    /* postpone this until now, when we're sure nothing else can go wrong */

-    if ((status = SyncInitTrigger(client, &pAlarm->trigger, counter,

-			     origmask & XSyncCAAllTrigger)) != Success)

-	return status;

-

-    /* XXX spec does not really say to do this - needs clarification */

-    pAlarm->state = XSyncAlarmActive;

-    return Success;

-}

-

-

-static SyncCounter *

-SyncCreateCounter(ClientPtr client, XSyncCounter id, CARD64 initialvalue)

-{

-    SyncCounter *pCounter;

-

-    if (!(pCounter = malloc(sizeof(SyncCounter))))

-	return NULL;

-

-    if (!AddResource(id, RTCounter, (pointer) pCounter))

-    {

-	free(pCounter);

-	return NULL;

-    }

-

-    pCounter->client = client;

-    pCounter->id = id;

-    pCounter->value = initialvalue;

-    pCounter->pTriglist = NULL;

-    pCounter->beingDestroyed = FALSE;

-    pCounter->pSysCounterInfo = NULL;

-    return pCounter;

-}

-

-static int FreeCounter(void *, XID);

-

-/*

- * ***** System Counter utilities

- */

-

-pointer

-SyncCreateSystemCounter(

-	char *name,

-	CARD64 initial,

-	CARD64 resolution,

-	SyncCounterType counterType,

-	void (*QueryValue)(pointer /* pCounter */,

-	      	           CARD64 * /* pValue_return */),

-	void (*BracketValues)(pointer /* pCounter */,

-	       	              CARD64 * /* pbracket_less */,

-	                      CARD64 * /* pbracket_greater */)

-	)

-{

-    SyncCounter    *pCounter;

-

-    SysCounterList = realloc(SysCounterList,

-			    (SyncNumSystemCounters+1)*sizeof(SyncCounter *));

-    if (!SysCounterList)

-	return NULL;

-

-    /* this function may be called before SYNC has been initialized, so we

-     * have to make sure RTCounter is created.

-     */

-    if (RTCounter == 0)

-    {

-	RTCounter = CreateNewResourceType(FreeCounter, "SyncCounter");

-	if (RTCounter == 0)

-	{

-	    return NULL;

-	}

-    }

-

-    pCounter = SyncCreateCounter(NULL, FakeClientID(0), initial);

-

-    if (pCounter)

-    {

-	SysCounterInfo *psci;

-

-	psci = malloc(sizeof(SysCounterInfo));

-	if (!psci)

-	{

-	    FreeResource(pCounter->id, RT_NONE);

-	    return pCounter;

-	}

-	pCounter->pSysCounterInfo = psci;

-	psci->name = name;

-	psci->resolution = resolution;

-	psci->counterType = counterType;

-	psci->QueryValue = QueryValue;

-	psci->BracketValues = BracketValues;

-	XSyncMaxValue(&psci->bracket_greater);

-	XSyncMinValue(&psci->bracket_less);

-	SysCounterList[SyncNumSystemCounters++] = pCounter;

-    }

-    return pCounter;

-}

-

-void

-SyncDestroySystemCounter(pointer pSysCounter)

-{

-    SyncCounter *pCounter = (SyncCounter *)pSysCounter;

-    FreeResource(pCounter->id, RT_NONE);

-}

-

-static void

-SyncComputeBracketValues(SyncCounter *pCounter)

-{

-    SyncTriggerList *pCur;

-    SyncTrigger *pTrigger;

-    SysCounterInfo *psci;

-    CARD64 *pnewgtval = NULL;

-    CARD64 *pnewltval = NULL;

-    SyncCounterType ct;

-

-    if (!pCounter)

-	return;

-

-    psci = pCounter->pSysCounterInfo;

-    ct = pCounter->pSysCounterInfo->counterType;

-    if (ct == XSyncCounterNeverChanges)

-	return;

-

-    XSyncMaxValue(&psci->bracket_greater);

-    XSyncMinValue(&psci->bracket_less);

-

-    for (pCur = pCounter->pTriglist; pCur; pCur = pCur->next)

-    {

-	pTrigger = pCur->pTrigger;

-	

-        if (pTrigger->test_type == XSyncPositiveComparison &&

-	    ct != XSyncCounterNeverIncreases)

-	{

-	    if (XSyncValueLessThan(pCounter->value, pTrigger->test_value) &&

-		XSyncValueLessThan(pTrigger->test_value,

-				   psci->bracket_greater))

-	    {

-		psci->bracket_greater = pTrigger->test_value;

-		pnewgtval = &psci->bracket_greater;

-	    }

-	}

-	else if (pTrigger->test_type == XSyncNegativeComparison &&

-		 ct != XSyncCounterNeverDecreases)

-	{

-	    if (XSyncValueGreaterThan(pCounter->value, pTrigger->test_value) &&

-		XSyncValueGreaterThan(pTrigger->test_value,

-				      psci->bracket_less))

-	    {

-		psci->bracket_less = pTrigger->test_value;

-		pnewltval = &psci->bracket_less;

-	    }

-	}

-	else if (pTrigger->test_type == XSyncNegativeTransition &&

-		   ct != XSyncCounterNeverIncreases)

-	{

-	    if (XSyncValueGreaterThan(pCounter->value, pTrigger->test_value) &&

-		XSyncValueGreaterThan(pTrigger->test_value, psci->bracket_less))

-	    {

-		psci->bracket_less = pTrigger->test_value;

-		pnewltval = &psci->bracket_less;

-	    }

-	}

-        else if (pTrigger->test_type == XSyncPositiveTransition &&

-		  ct != XSyncCounterNeverDecreases)

-	{

-	    if (XSyncValueLessThan(pCounter->value, pTrigger->test_value) &&

-		XSyncValueLessThan(pTrigger->test_value, psci->bracket_greater))

-	    {

-		psci->bracket_greater = pTrigger->test_value;

-		pnewgtval = &psci->bracket_greater;

-	    }

-	}

-    } /* end for each trigger */

-

-    if (pnewgtval || pnewltval)

-    {

-	(*psci->BracketValues)((pointer)pCounter, pnewltval, pnewgtval);

-    }

-}

-

-/*

- * *****  Resource delete functions

- */

-

-/* ARGSUSED */

-static int

-FreeAlarm(void *addr, XID id)

-{

-    SyncAlarm      *pAlarm = (SyncAlarm *) addr;

-

-    pAlarm->state = XSyncAlarmDestroyed;

-

-    SyncSendAlarmNotifyEvents(pAlarm);

-

-    /* delete event selections */

-

-    while (pAlarm->pEventClients)

-	FreeResource(pAlarm->pEventClients->delete_id, RT_NONE);

-

-    SyncDeleteTriggerFromCounter(&pAlarm->trigger);

-

-    free(pAlarm);

-    return Success;

-}

-

-

-/*

- * ** Cleanup after the destruction of a Counter

- */

-/* ARGSUSED */

-static int

-FreeCounter(void *env, XID id)

-{

-    SyncCounter     *pCounter = (SyncCounter *) env;

-    SyncTriggerList *ptl, *pnext;

-

-    pCounter->beingDestroyed = TRUE;

-    /* tell all the counter's triggers that the counter has been destroyed */

-    for (ptl = pCounter->pTriglist; ptl; ptl = pnext)

-    {

-	(*ptl->pTrigger->CounterDestroyed)(ptl->pTrigger);

-	pnext = ptl->next;

-	free(ptl); /* destroy the trigger list as we go */

-    }

-    if (IsSystemCounter(pCounter))

-    {

-	int i, found = 0;

-

-	free(pCounter->pSysCounterInfo);

-

-	/* find the counter in the list of system counters and remove it */

-

-	if (SysCounterList)

-	{

-	    for (i = 0; i < SyncNumSystemCounters; i++)

-	    {

-		if (SysCounterList[i] == pCounter)

-		{

-		    found = i;

-		    break;

-		}

-	    }

-	    if (found < (SyncNumSystemCounters-1))

-	    {

-		for (i = found; i < SyncNumSystemCounters-1; i++)

-		{

-		    SysCounterList[i] = SysCounterList[i+1];

-		}

-	    }

-	}

-	SyncNumSystemCounters--;

-    }

-    free(pCounter);

-    return Success;

-}

-

-/*

- * ** Cleanup after Await

- */

-/* ARGSUSED */

-static int

-FreeAwait(void *addr, XID id)

-{

-    SyncAwaitUnion *pAwaitUnion = (SyncAwaitUnion *) addr;

-    SyncAwait *pAwait;

-    int numwaits;

-

-    pAwait = &(pAwaitUnion+1)->await; /* first await on list */

-

-    /* remove triggers from counters */

-

-    for (numwaits = pAwaitUnion->header.num_waitconditions; numwaits;

-	 numwaits--, pAwait++)

-    {

-	/* If the counter is being destroyed, FreeCounter will delete

-	 * the trigger list itself, so don't do it here.

-	 */

-	SyncCounter *pCounter = pAwait->trigger.pCounter;

-	if (pCounter && !pCounter->beingDestroyed)

-	    SyncDeleteTriggerFromCounter(&pAwait->trigger);

-    }

-    free(pAwaitUnion);

-    return Success;

-}

-

-/* loosely based on dix/events.c/OtherClientGone */

-static int

-FreeAlarmClient(void *value, XID id)

-{

-    SyncAlarm *pAlarm = (SyncAlarm *)value;

-    SyncAlarmClientList *pCur, *pPrev;

-

-    for (pPrev = NULL, pCur = pAlarm->pEventClients;

-	 pCur;

-	 pPrev = pCur, pCur = pCur->next)

-    {

-	if (pCur->delete_id == id)

-	{

-	    if (pPrev)

-		pPrev->next = pCur->next;

-	    else

-		pAlarm->pEventClients = pCur->next;

-	    free(pCur);

-	    return Success;

-	}

-    }

-    FatalError("alarm client not on event list");

-    /*NOTREACHED*/

-}

-

-

-/*

- * *****  Proc functions

- */

-

-

-/*

- * ** Initialize the extension

- */

-static int

-ProcSyncInitialize(ClientPtr client)

-{

-    xSyncInitializeReply  rep;

-    int   n;

-

-    REQUEST_SIZE_MATCH(xSyncInitializeReq);

-

-    memset(&rep, 0, sizeof(xSyncInitializeReply));

-    rep.type = X_Reply;

-    rep.sequenceNumber = client->sequence;

-    rep.majorVersion = SYNC_MAJOR_VERSION;

-    rep.minorVersion = SYNC_MINOR_VERSION;

-    rep.length = 0;

-

-    if (client->swapped)

-    {

-	swaps(&rep.sequenceNumber, n);

-    }

-    WriteToClient(client, sizeof(rep), (char *) &rep);

-    return Success;

-}

-

-/*

- * ** Get list of system counters available through the extension

- */

-static int

-ProcSyncListSystemCounters(ClientPtr client)

-{

-    xSyncListSystemCountersReply  rep;

-    int i, len;

-    xSyncSystemCounter *list = NULL, *walklist = NULL;

-

-    REQUEST_SIZE_MATCH(xSyncListSystemCountersReq);

-

-    rep.type = X_Reply;

-    rep.sequenceNumber = client->sequence;

-    rep.nCounters = SyncNumSystemCounters;

-

-    for (i = len = 0; i < SyncNumSystemCounters; i++)

-    {

-	char *name = SysCounterList[i]->pSysCounterInfo->name;

-	/* pad to 4 byte boundary */

-	len += pad_to_int32(sz_xSyncSystemCounter + strlen(name));

-    }

-

-    if (len)

-    {

-	walklist = list = malloc(len);

-	if (!list)

-	    return BadAlloc;

-    }

-

-    rep.length = bytes_to_int32(len);

-

-    if (client->swapped)

-    {

-	char n;

-	swaps(&rep.sequenceNumber, n);

-	swapl(&rep.length, n);

-	swapl(&rep.nCounters, n);

-    }

-

-    for (i = 0; i < SyncNumSystemCounters; i++)

-    {

-	int namelen;

-	char *pname_in_reply;

-	SysCounterInfo *psci = SysCounterList[i]->pSysCounterInfo;

-

-	walklist->counter = SysCounterList[i]->id;

-	walklist->resolution_hi = XSyncValueHigh32(psci->resolution);

-	walklist->resolution_lo = XSyncValueLow32(psci->resolution);

-	namelen = strlen(psci->name);

-	walklist->name_length = namelen;

-

-	if (client->swapped)

-	{

-	    char n;

-	    swapl(&walklist->counter, n);

-	    swapl(&walklist->resolution_hi, n);

-	    swapl(&walklist->resolution_lo, n);

-	    swaps(&walklist->name_length, n);

-	}

-

-	pname_in_reply = ((char *)walklist) + sz_xSyncSystemCounter;

-	strncpy(pname_in_reply, psci->name, namelen);

-	walklist = (xSyncSystemCounter *) (((char *)walklist) +

-				pad_to_int32(sz_xSyncSystemCounter + namelen));

-    }

-

-    WriteToClient(client, sizeof(rep), (char *) &rep);

-    if (len)

-    {

-	WriteToClient(client, len, (char *) list);

-	free(list);

-    }

-

-    return Success;

-}

-

-/*

- * ** Set client Priority

- */

-static int

-ProcSyncSetPriority(ClientPtr client)

-{

-    REQUEST(xSyncSetPriorityReq);

-    ClientPtr priorityclient;

-    int rc;

-

-    REQUEST_SIZE_MATCH(xSyncSetPriorityReq);

-

-    if (stuff->id == None)

-	priorityclient = client;

-    else {

-	rc = dixLookupClient(&priorityclient, stuff->id, client,

-			     DixSetAttrAccess);

-	if (rc != Success)

-	    return rc;

-    }

-

-    if (priorityclient->priority != stuff->priority)

-    {

-	priorityclient->priority = stuff->priority;

-

-	/*  The following will force the server back into WaitForSomething

-	 *  so that the change in this client's priority is immediately

-	 *  reflected.

-	 */

-	isItTimeToYield = TRUE;

-	dispatchException |= DE_PRIORITYCHANGE;

-    }

-    return Success;

-}

-

-/*

- * ** Get client Priority

- */

-static int

-ProcSyncGetPriority(ClientPtr client)

-{

-    REQUEST(xSyncGetPriorityReq);

-    xSyncGetPriorityReply rep;

-    ClientPtr priorityclient;

-    int rc;

-

-    REQUEST_SIZE_MATCH(xSyncGetPriorityReq);

-

-    if (stuff->id == None)

-	priorityclient = client;

-    else {

-	rc = dixLookupClient(&priorityclient, stuff->id, client,

-			     DixGetAttrAccess);

-	if (rc != Success)

-	    return rc;

-    }

-

-    rep.type = X_Reply;

-    rep.length = 0;

-    rep.sequenceNumber = client->sequence;

-    rep.priority = priorityclient->priority;

-

-    if (client->swapped)

-    {

-	char n;

-	swaps(&rep.sequenceNumber, n);

-	swapl(&rep.priority, n);

-    }

-

-    WriteToClient(client, sizeof(xSyncGetPriorityReply), (char *) &rep);

-

-    return Success;

-}

-

-/*

- * ** Create a new counter

- */

-static int

-ProcSyncCreateCounter(ClientPtr client)

-{

-    REQUEST(xSyncCreateCounterReq);

-    CARD64          initial;

-

-    REQUEST_SIZE_MATCH(xSyncCreateCounterReq);

-

-    LEGAL_NEW_RESOURCE(stuff->cid, client);

-

-    XSyncIntsToValue(&initial, stuff->initial_value_lo, stuff->initial_value_hi);

-    if (!SyncCreateCounter(client, stuff->cid, initial))

-	return BadAlloc;

-

-    return Success;

-}

-

-/*

- * ** Set Counter value

- */

-static int

-ProcSyncSetCounter(ClientPtr client)

-{

-    REQUEST(xSyncSetCounterReq);

-    SyncCounter    *pCounter;

-    CARD64	   newvalue;

-    int	rc;

-

-    REQUEST_SIZE_MATCH(xSyncSetCounterReq);

-

-    rc = dixLookupResourceByType((pointer *)&pCounter, stuff->cid, RTCounter,

-				 client, DixWriteAccess);

-    if (rc != Success)

-	return (rc == BadValue) ? SyncErrorBase + XSyncBadCounter : rc;

-

-    if (IsSystemCounter(pCounter))

-    {

-	client->errorValue = stuff->cid;

-	return BadAccess;

-    }

-

-    XSyncIntsToValue(&newvalue, stuff->value_lo, stuff->value_hi);

-    SyncChangeCounter(pCounter, newvalue);

-    return Success;

-}

-

-/*

- * ** Change Counter value

- */

-static int

-ProcSyncChangeCounter(ClientPtr client)

-{

-    REQUEST(xSyncChangeCounterReq);

-    SyncCounter    *pCounter;

-    CARD64          newvalue;

-    Bool	    overflow;

-    int	rc;

-

-    REQUEST_SIZE_MATCH(xSyncChangeCounterReq);

-

-    rc = dixLookupResourceByType((pointer *)&pCounter, stuff->cid, RTCounter,

-				 client, DixWriteAccess);

-    if (rc != Success)

-	return (rc == BadValue) ? SyncErrorBase + XSyncBadCounter : rc;

-

-    if (IsSystemCounter(pCounter))

-    {

-	client->errorValue = stuff->cid;

-	return BadAccess;

-    }

-

-    XSyncIntsToValue(&newvalue, stuff->value_lo, stuff->value_hi);

-    XSyncValueAdd(&newvalue, pCounter->value, newvalue, &overflow);

-    if (overflow)

-    {

-	/* XXX 64 bit value can't fit in 32 bits; do the best we can */

-	client->errorValue = stuff->value_hi;

-	return BadValue;

-    }

-    SyncChangeCounter(pCounter, newvalue);

-    return Success;

-}

-

-/*

- * ** Destroy a counter

- */

-static int

-ProcSyncDestroyCounter(ClientPtr client)

-{

-    REQUEST(xSyncDestroyCounterReq);

-    SyncCounter    *pCounter;

-    int rc;

-

-    REQUEST_SIZE_MATCH(xSyncDestroyCounterReq);

-

-    rc = dixLookupResourceByType((pointer *)&pCounter, stuff->counter, RTCounter,

-				 client, DixDestroyAccess);

-    if (rc != Success)

-	return (rc == BadValue) ? SyncErrorBase + XSyncBadCounter : rc;

-

-    if (IsSystemCounter(pCounter))

-    {

-	client->errorValue = stuff->counter;

-	return BadAccess;

-    }

-    FreeResource(pCounter->id, RT_NONE);

-    return Success;

-}

-

-

-/*

- * ** Await

- */

-static int

-ProcSyncAwait(ClientPtr client)

-{

-    REQUEST(xSyncAwaitReq);

-    int             len, items;

-    int             i;

-    xSyncWaitCondition *pProtocolWaitConds;

-    SyncAwaitUnion *pAwaitUnion;

-    SyncAwait	   *pAwait;

-    int		   status;

-

-    REQUEST_AT_LEAST_SIZE(xSyncAwaitReq);

-

-    len = client->req_len << 2;

-    len -= sz_xSyncAwaitReq;

-    items = len / sz_xSyncWaitCondition;

-

-    if (items * sz_xSyncWaitCondition != len)

-    {

-	return BadLength;

-    }

-    if (items == 0)

-    {

-	client->errorValue = items; /* XXX protocol change */

-	return BadValue;

-    }

-

-    pProtocolWaitConds = (xSyncWaitCondition *) & stuff[1];

-

-    /*  all the memory for the entire await list is allocated

-     *  here in one chunk

-     */

-    pAwaitUnion = malloc((items+1) * sizeof(SyncAwaitUnion));

-    if (!pAwaitUnion)

-	return BadAlloc;

-

-    /* first item is the header, remainder are real wait conditions */

-

-    pAwaitUnion->header.delete_id = FakeClientID(client->index);

-    if (!AddResource(pAwaitUnion->header.delete_id, RTAwait, pAwaitUnion))

-    {

-	free(pAwaitUnion);

-	return BadAlloc;

-    }

-

-    /* don't need to do any more memory allocation for this request! */

-

-    pAwaitUnion->header.client = client;

-    pAwaitUnion->header.num_waitconditions = 0;

-

-    pAwait = &(pAwaitUnion+1)->await; /* skip over header */

-    for (i = 0; i < items; i++, pProtocolWaitConds++, pAwait++)

-    {

-	if (pProtocolWaitConds->counter == None) /* XXX protocol change */

-	{

-	    /*  this should take care of removing any triggers created by

-	     *  this request that have already been registered on counters

-	     */

-	    FreeResource(pAwaitUnion->header.delete_id, RT_NONE);

-	    client->errorValue = pProtocolWaitConds->counter;

-	    return SyncErrorBase + XSyncBadCounter;

-	}

-

-	/* sanity checks are in SyncInitTrigger */

-	pAwait->trigger.pCounter = NULL;

-	pAwait->trigger.value_type = pProtocolWaitConds->value_type;

-	XSyncIntsToValue(&pAwait->trigger.wait_value,

-			 pProtocolWaitConds->wait_value_lo,

-			 pProtocolWaitConds->wait_value_hi);

-	pAwait->trigger.test_type = pProtocolWaitConds->test_type;

-

-	status = SyncInitTrigger(client, &pAwait->trigger,

-			 pProtocolWaitConds->counter, XSyncCAAllTrigger);

-	if (status != Success)

-	{

-	    /*  this should take care of removing any triggers created by

-	     *  this request that have already been registered on counters

-	     */

-	    FreeResource(pAwaitUnion->header.delete_id, RT_NONE);

-	    return status;

-	}

-	/* this is not a mistake -- same function works for both cases */

-	pAwait->trigger.TriggerFired = SyncAwaitTriggerFired;

-	pAwait->trigger.CounterDestroyed = SyncAwaitTriggerFired;

-	XSyncIntsToValue(&pAwait->event_threshold,

-			 pProtocolWaitConds->event_threshold_lo,

-			 pProtocolWaitConds->event_threshold_hi);

-	pAwait->pHeader = &pAwaitUnion->header;

-	pAwaitUnion->header.num_waitconditions++;

-    }

-

-    IgnoreClient(client);

-

-    /* see if any of the triggers are already true */

-

-    pAwait = &(pAwaitUnion+1)->await; /* skip over header */

-    for (i = 0; i < items; i++, pAwait++)

-    {

-	/*  don't have to worry about NULL counters because the request

-	 *  errors before we get here out if they occur

-	 */

-	if ((*pAwait->trigger.CheckTrigger)(&pAwait->trigger,

-					    pAwait->trigger.pCounter->value))

-	{

-	    (*pAwait->trigger.TriggerFired)(&pAwait->trigger);

-	    break; /* once is enough */

-	}

-    }

-    return Success;

-}

-

-

-/*

- * ** Query a counter

- */

-static int

-ProcSyncQueryCounter(ClientPtr client)

-{

-    REQUEST(xSyncQueryCounterReq);

-    xSyncQueryCounterReply rep;

-    SyncCounter    *pCounter;

-    int rc;

-

-    REQUEST_SIZE_MATCH(xSyncQueryCounterReq);

-

-    rc = dixLookupResourceByType((pointer *)&pCounter, stuff->counter,

-				 RTCounter, client, DixReadAccess);

-    if (rc != Success)

-	return (rc == BadValue) ? SyncErrorBase + XSyncBadCounter : rc;

-

-    rep.type = X_Reply;

-    rep.length = 0;

-    rep.sequenceNumber = client->sequence;

-

-    /* if system counter, ask it what the current value is */

-

-    if (IsSystemCounter(pCounter))

-    {

-	(*pCounter->pSysCounterInfo->QueryValue) ((pointer) pCounter,

-						  &pCounter->value);

-    }

-

-    rep.value_hi = XSyncValueHigh32(pCounter->value);

-    rep.value_lo = XSyncValueLow32(pCounter->value);

-    if (client->swapped)

-    {

-	char n;

-	swaps(&rep.sequenceNumber, n);

-	swapl(&rep.length, n);

-	swapl(&rep.value_hi, n);

-	swapl(&rep.value_lo, n);

-    }

-    WriteToClient(client, sizeof(xSyncQueryCounterReply), (char *) &rep);

-    return Success;

-}

-

-

-/*

- * ** Create Alarm

- */

-static int

-ProcSyncCreateAlarm(ClientPtr client)

-{

-    REQUEST(xSyncCreateAlarmReq);

-    SyncAlarm      *pAlarm;

-    int             status;

-    unsigned long   len, vmask;

-    SyncTrigger	    *pTrigger;

-

-    REQUEST_AT_LEAST_SIZE(xSyncCreateAlarmReq);

-

-    LEGAL_NEW_RESOURCE(stuff->id, client);

-

-    vmask = stuff->valueMask;

-    len = client->req_len - bytes_to_int32(sizeof(xSyncCreateAlarmReq));

-    /* the "extra" call to Ones accounts for the presence of 64 bit values */

-    if (len != (Ones(vmask) + Ones(vmask & (XSyncCAValue|XSyncCADelta))))

-	return BadLength;

-

-    if (!(pAlarm = malloc(sizeof(SyncAlarm))))

-    {

-	return BadAlloc;

-    }

-

-    /* set up defaults */

-

-    pTrigger = &pAlarm->trigger;

-    pTrigger->pCounter = NULL;

-    pTrigger->value_type = XSyncAbsolute;

-    XSyncIntToValue(&pTrigger->wait_value, 0L);

-    pTrigger->test_type = XSyncPositiveComparison;

-    pTrigger->TriggerFired = SyncAlarmTriggerFired;

-    pTrigger->CounterDestroyed = SyncAlarmCounterDestroyed;

-    status = SyncInitTrigger(client, pTrigger, None, XSyncCAAllTrigger);

-    if (status != Success)

-    {

-	free(pAlarm);

-	return status;

-    }

-

-    pAlarm->client = client;

-    pAlarm->alarm_id = stuff->id;

-    XSyncIntToValue(&pAlarm->delta, 1L);

-    pAlarm->events = TRUE;

-    pAlarm->state = XSyncAlarmInactive;

-    pAlarm->pEventClients = NULL;

-    status = SyncChangeAlarmAttributes(client, pAlarm, vmask,

-				       (CARD32 *)&stuff[1]);

-    if (status != Success)

-    {

-	free(pAlarm);

-	return status;

-    }

-

-    if (!AddResource(stuff->id, RTAlarm, pAlarm))

-    {

-	free(pAlarm);

-	return BadAlloc;

-    }

-

-    /*  see if alarm already triggered.  NULL counter will not trigger

-     *  in CreateAlarm and sets alarm state to Inactive.

-     */

-

-    if (!pTrigger->pCounter)

-    {

-	pAlarm->state = XSyncAlarmInactive; /* XXX protocol change */

-    }

-    else if ((*pTrigger->CheckTrigger)(pTrigger, pTrigger->pCounter->value))

-    {

-	(*pTrigger->TriggerFired)(pTrigger);

-    }

-

-    return Success;

-}

-

-/*

- * ** Change Alarm

- */

-static int

-ProcSyncChangeAlarm(ClientPtr client)

-{

-    REQUEST(xSyncChangeAlarmReq);

-    SyncAlarm   *pAlarm;

-    long        vmask;

-    int         len, status;

-

-    REQUEST_AT_LEAST_SIZE(xSyncChangeAlarmReq);

-

-    status = dixLookupResourceByType((pointer *)&pAlarm, stuff->alarm, RTAlarm,

-				     client, DixWriteAccess);

-    if (status != Success)

-	return (status == BadValue) ? SyncErrorBase + XSyncBadAlarm : status;

-

-    vmask = stuff->valueMask;

-    len = client->req_len - bytes_to_int32(sizeof(xSyncChangeAlarmReq));

-    /* the "extra" call to Ones accounts for the presence of 64 bit values */

-    if (len != (Ones(vmask) + Ones(vmask & (XSyncCAValue|XSyncCADelta))))

-	return BadLength;

-

-    if ((status = SyncChangeAlarmAttributes(client, pAlarm, vmask,

-					    (CARD32 *)&stuff[1])) != Success)

-	return status;

-

-    /*  see if alarm already triggered.  NULL counter WILL trigger

-     *  in ChangeAlarm.

-     */

-

-    if (!pAlarm->trigger.pCounter ||

-	(*pAlarm->trigger.CheckTrigger)(&pAlarm->trigger,

-					pAlarm->trigger.pCounter->value))

-    {

-	(*pAlarm->trigger.TriggerFired)(&pAlarm->trigger);

-    }

-    return Success;

-}

-

-static int

-ProcSyncQueryAlarm(ClientPtr client)

-{

-    REQUEST(xSyncQueryAlarmReq);

-    SyncAlarm      *pAlarm;

-    xSyncQueryAlarmReply rep;

-    SyncTrigger    *pTrigger;

-    int rc;

-

-    REQUEST_SIZE_MATCH(xSyncQueryAlarmReq);

-

-    rc = dixLookupResourceByType((pointer *)&pAlarm, stuff->alarm, RTAlarm,

-				 client, DixReadAccess);

-    if (rc != Success)

-	return (rc == BadValue) ? SyncErrorBase + XSyncBadAlarm : rc;

-

-    rep.type = X_Reply;

-    rep.length = bytes_to_int32(sizeof(xSyncQueryAlarmReply) - sizeof(xGenericReply));

-    rep.sequenceNumber = client->sequence;

-

-    pTrigger = &pAlarm->trigger;

-    rep.counter = (pTrigger->pCounter) ? pTrigger->pCounter->id : None;

-

-#if 0 /* XXX unclear what to do, depends on whether relative value-types

-       * are "consumed" immediately and are considered absolute from then

-       * on.

-       */

-    rep.value_type = pTrigger->value_type;

-    rep.wait_value_hi = XSyncValueHigh32(pTrigger->wait_value);

-    rep.wait_value_lo = XSyncValueLow32(pTrigger->wait_value);

-#else

-    rep.value_type = XSyncAbsolute;

-    rep.wait_value_hi = XSyncValueHigh32(pTrigger->test_value);

-    rep.wait_value_lo = XSyncValueLow32(pTrigger->test_value);

-#endif

-

-    rep.test_type = pTrigger->test_type;

-    rep.delta_hi = XSyncValueHigh32(pAlarm->delta);

-    rep.delta_lo = XSyncValueLow32(pAlarm->delta);

-    rep.events = pAlarm->events;

-    rep.state = pAlarm->state;

-

-    if (client->swapped)

-    {

-	char n;

-	swaps(&rep.sequenceNumber, n);

-	swapl(&rep.length, n);

-	swapl(&rep.counter, n);

-	swapl(&rep.wait_value_hi, n);

-	swapl(&rep.wait_value_lo, n);

-	swapl(&rep.test_type, n);

-	swapl(&rep.delta_hi, n);

-	swapl(&rep.delta_lo, n);

-    }

-

-    WriteToClient(client, sizeof(xSyncQueryAlarmReply), (char *) &rep);

-    return Success;

-}

-

-static int

-ProcSyncDestroyAlarm(ClientPtr client)

-{

-    SyncAlarm *pAlarm;

-    int rc;

-    REQUEST(xSyncDestroyAlarmReq);

-

-    REQUEST_SIZE_MATCH(xSyncDestroyAlarmReq);

-

-    rc = dixLookupResourceByType((pointer *)&pAlarm, stuff->alarm, RTAlarm,

-				 client, DixDestroyAccess);

-    if (rc != Success)

-	return (rc == BadValue) ? SyncErrorBase + XSyncBadAlarm : rc;

-

-    FreeResource(stuff->alarm, RT_NONE);

-    return Success;

-}

-

-/*

- * ** Given an extension request, call the appropriate request procedure

- */

-static int

-ProcSyncDispatch(ClientPtr client)

-{

-    REQUEST(xReq);

-

-    switch (stuff->data)

-    {

-      case X_SyncInitialize:

-	return ProcSyncInitialize(client);

-      case X_SyncListSystemCounters:

-	return ProcSyncListSystemCounters(client);

-      case X_SyncCreateCounter:

-	return ProcSyncCreateCounter(client);

-      case X_SyncSetCounter:

-	return ProcSyncSetCounter(client);

-      case X_SyncChangeCounter:

-	return ProcSyncChangeCounter(client);

-      case X_SyncQueryCounter:

-	return ProcSyncQueryCounter(client);

-      case X_SyncDestroyCounter:

-	return ProcSyncDestroyCounter(client);

-      case X_SyncAwait:

-	return ProcSyncAwait(client);

-      case X_SyncCreateAlarm:

-	return ProcSyncCreateAlarm(client);

-      case X_SyncChangeAlarm:

-	return ProcSyncChangeAlarm(client);

-      case X_SyncQueryAlarm:

-	return ProcSyncQueryAlarm(client);

-      case X_SyncDestroyAlarm:

-	return ProcSyncDestroyAlarm(client);

-      case X_SyncSetPriority:

-	return ProcSyncSetPriority(client);

-      case X_SyncGetPriority:

-	return ProcSyncGetPriority(client);

-      default:

-	return BadRequest;

-    }

-}

-

-/*

- * Boring Swapping stuff ...

- */

-

-static int

-SProcSyncInitialize(ClientPtr client)

-{

-    REQUEST(xSyncInitializeReq);

-    char   n;

-

-    swaps(&stuff->length, n);

-    REQUEST_SIZE_MATCH (xSyncInitializeReq);

-

-    return ProcSyncInitialize(client);

-}

-

-static int

-SProcSyncListSystemCounters(ClientPtr client)

-{

-    REQUEST(xSyncListSystemCountersReq);

-    char   n;

-

-    swaps(&stuff->length, n);

-    REQUEST_SIZE_MATCH (xSyncListSystemCountersReq);

-

-    return ProcSyncListSystemCounters(client);

-}

-

-static int

-SProcSyncCreateCounter(ClientPtr client)

-{

-    REQUEST(xSyncCreateCounterReq);

-    char   n;

-

-    swaps(&stuff->length, n);

-    REQUEST_SIZE_MATCH (xSyncCreateCounterReq);

-    swapl(&stuff->cid, n);

-    swapl(&stuff->initial_value_lo, n);

-    swapl(&stuff->initial_value_hi, n);

-

-    return ProcSyncCreateCounter(client);

-}

-

-static int

-SProcSyncSetCounter(ClientPtr client)

-{

-    REQUEST(xSyncSetCounterReq);

-    char   n;

-

-    swaps(&stuff->length, n);

-    REQUEST_SIZE_MATCH (xSyncSetCounterReq);

-    swapl(&stuff->cid, n);

-    swapl(&stuff->value_lo, n);

-    swapl(&stuff->value_hi, n);

-

-    return ProcSyncSetCounter(client);

-}

-

-static int

-SProcSyncChangeCounter(ClientPtr client)

-{

-    REQUEST(xSyncChangeCounterReq);

-    char   n;

-

-    swaps(&stuff->length, n);

-    REQUEST_SIZE_MATCH (xSyncChangeCounterReq);

-    swapl(&stuff->cid, n);

-    swapl(&stuff->value_lo, n);

-    swapl(&stuff->value_hi, n);

-

-    return ProcSyncChangeCounter(client);

-}

-

-static int

-SProcSyncQueryCounter(ClientPtr client)

-{

-    REQUEST(xSyncQueryCounterReq);

-    char   n;

-

-    swaps(&stuff->length, n);

-    REQUEST_SIZE_MATCH (xSyncQueryCounterReq);

-    swapl(&stuff->counter, n);

-

-    return ProcSyncQueryCounter(client);

-}

-

-static int

-SProcSyncDestroyCounter(ClientPtr client)

-{

-    REQUEST(xSyncDestroyCounterReq);

-    char   n;

-

-    swaps(&stuff->length, n);

-    REQUEST_SIZE_MATCH (xSyncDestroyCounterReq);

-    swapl(&stuff->counter, n);

-

-    return ProcSyncDestroyCounter(client);

-}

-

-static int

-SProcSyncAwait(ClientPtr client)

-{

-    REQUEST(xSyncAwaitReq);

-    char   n;

-

-    swaps(&stuff->length, n);

-    REQUEST_AT_LEAST_SIZE(xSyncAwaitReq);

-    SwapRestL(stuff);

-

-    return ProcSyncAwait(client);

-}

-

-static int

-SProcSyncCreateAlarm(ClientPtr client)

-{

-    REQUEST(xSyncCreateAlarmReq);

-    char   n;

-

-    swaps(&stuff->length, n);

-    REQUEST_AT_LEAST_SIZE(xSyncCreateAlarmReq);

-    swapl(&stuff->id, n);

-    swapl(&stuff->valueMask, n);

-    SwapRestL(stuff);

-

-    return ProcSyncCreateAlarm(client);

-}

-

-static int

-SProcSyncChangeAlarm(ClientPtr client)

-{

-    REQUEST(xSyncChangeAlarmReq);

-    char   n;

-

-    swaps(&stuff->length, n);

-    REQUEST_AT_LEAST_SIZE(xSyncChangeAlarmReq);

-    swapl(&stuff->alarm, n);

-    swapl(&stuff->valueMask, n);

-    SwapRestL(stuff);

-    return ProcSyncChangeAlarm(client);

-}

-

-static int

-SProcSyncQueryAlarm(ClientPtr client)

-{

-    REQUEST(xSyncQueryAlarmReq);

-    char   n;

-

-    swaps(&stuff->length, n);

-    REQUEST_SIZE_MATCH (xSyncQueryAlarmReq);

-    swapl(&stuff->alarm, n);

-

-    return ProcSyncQueryAlarm(client);

-}

-

-static int

-SProcSyncDestroyAlarm(ClientPtr client)

-{

-    REQUEST(xSyncDestroyAlarmReq);

-    char   n;

-

-    swaps(&stuff->length, n);

-    REQUEST_SIZE_MATCH (xSyncDestroyAlarmReq);

-    swapl(&stuff->alarm, n);

-

-    return ProcSyncDestroyAlarm(client);

-}

-

-static int

-SProcSyncSetPriority(ClientPtr client)

-{

-    REQUEST(xSyncSetPriorityReq);

-    char   n;

-

-    swaps(&stuff->length, n);

-    REQUEST_SIZE_MATCH (xSyncSetPriorityReq);

-    swapl(&stuff->id, n);

-    swapl(&stuff->priority, n);

-

-    return ProcSyncSetPriority(client);

-}

-

-static int

-SProcSyncGetPriority(ClientPtr client)

-{

-    REQUEST(xSyncGetPriorityReq);

-    char   n;

-

-    swaps(&stuff->length, n);

-    REQUEST_SIZE_MATCH (xSyncGetPriorityReq);

-    swapl(&stuff->id, n);

-

-    return ProcSyncGetPriority(client);

-}

-

-

-static int

-SProcSyncDispatch(ClientPtr client)

-{

-    REQUEST(xReq);

-

-    switch (stuff->data)

-    {

-      case X_SyncInitialize:

-	return SProcSyncInitialize(client);

-      case X_SyncListSystemCounters:

-	return SProcSyncListSystemCounters(client);

-      case X_SyncCreateCounter:

-	return SProcSyncCreateCounter(client);

-      case X_SyncSetCounter:

-	return SProcSyncSetCounter(client);

-      case X_SyncChangeCounter:

-	return SProcSyncChangeCounter(client);

-      case X_SyncQueryCounter:

-	return SProcSyncQueryCounter(client);

-      case X_SyncDestroyCounter:

-	return SProcSyncDestroyCounter(client);

-      case X_SyncAwait:

-	return SProcSyncAwait(client);

-      case X_SyncCreateAlarm:

-	return SProcSyncCreateAlarm(client);

-      case X_SyncChangeAlarm:

-	return SProcSyncChangeAlarm(client);

-      case X_SyncQueryAlarm:

-	return SProcSyncQueryAlarm(client);

-      case X_SyncDestroyAlarm:

-	return SProcSyncDestroyAlarm(client);

-      case X_SyncSetPriority:

-	return SProcSyncSetPriority(client);

-      case X_SyncGetPriority:

-	return SProcSyncGetPriority(client);

-      default:

-	return BadRequest;

-    }

-}

-

-/*

- * Event Swapping

- */

-

-static void

-SCounterNotifyEvent(xSyncCounterNotifyEvent *from, xSyncCounterNotifyEvent *to)

-{

-    to->type = from->type;

-    to->kind = from->kind;

-    cpswaps(from->sequenceNumber, to->sequenceNumber);

-    cpswapl(from->counter, to->counter);

-    cpswapl(from->wait_value_lo, to->wait_value_lo);

-    cpswapl(from->wait_value_hi, to->wait_value_hi);

-    cpswapl(from->counter_value_lo, to->counter_value_lo);

-    cpswapl(from->counter_value_hi, to->counter_value_hi);

-    cpswapl(from->time, to->time);

-    cpswaps(from->count, to->count);

-    to->destroyed = from->destroyed;

-}

-

-

-static void

-SAlarmNotifyEvent(xSyncAlarmNotifyEvent *from, xSyncAlarmNotifyEvent *to)

-{

-    to->type = from->type;

-    to->kind = from->kind;

-    cpswaps(from->sequenceNumber, to->sequenceNumber);

-    cpswapl(from->alarm, to->alarm);

-    cpswapl(from->counter_value_lo, to->counter_value_lo);

-    cpswapl(from->counter_value_hi, to->counter_value_hi);

-    cpswapl(from->alarm_value_lo, to->alarm_value_lo);

-    cpswapl(from->alarm_value_hi, to->alarm_value_hi);

-    cpswapl(from->time, to->time);

-    to->state = from->state;

-}

-

-/*

- * ** Close everything down. ** This is fairly simple for now.

- */

-/* ARGSUSED */

-static void

-SyncResetProc(ExtensionEntry *extEntry)

-{

-    free(SysCounterList);

-    SysCounterList = NULL;

-    RTCounter = 0;

-}

-

-

-/*

- * ** Initialise the extension.

- */

-void

-SyncExtensionInit(void)

-{

-    ExtensionEntry *extEntry;

-

-    if (RTCounter == 0)

-    {

-	RTCounter = CreateNewResourceType(FreeCounter, "SyncCounter");

-    }

-    RTAlarm = CreateNewResourceType(FreeAlarm, "SyncAlarm");

-    RTAwait = CreateNewResourceType(FreeAwait, "SyncAwait");

-    if (RTAwait)

-	RTAwait |= RC_NEVERRETAIN;

-    RTAlarmClient = CreateNewResourceType(FreeAlarmClient, "SyncAlarmClient");

-    if (RTAlarmClient)

-	RTAlarmClient |= RC_NEVERRETAIN;

-

-    if (RTCounter == 0 || RTAwait == 0 || RTAlarm == 0 ||

-	RTAlarmClient == 0 ||

-	(extEntry = AddExtension(SYNC_NAME,

-				 XSyncNumberEvents, XSyncNumberErrors,

-				 ProcSyncDispatch, SProcSyncDispatch,

-				 SyncResetProc,

-				 StandardMinorOpcode)) == NULL)

-    {

-	ErrorF("Sync Extension %d.%d failed to Initialise\n",

-		SYNC_MAJOR_VERSION, SYNC_MINOR_VERSION);

-	return;

-    }

-

-    SyncEventBase = extEntry->eventBase;

-    SyncErrorBase = extEntry->errorBase;

-    EventSwapVector[SyncEventBase + XSyncCounterNotify] = (EventSwapPtr) SCounterNotifyEvent;

-    EventSwapVector[SyncEventBase + XSyncAlarmNotify] = (EventSwapPtr) SAlarmNotifyEvent;

-

-    /*

-     * Although SERVERTIME is implemented by the OS layer, we initialise it

-     * here because doing it in OsInit() is too early. The resource database

-     * is not initialised when OsInit() is called. This is just about OK

-     * because there is always a servertime counter.

-     */

-    SyncInitServerTime();

-    SyncInitIdleTime();

-

-#ifdef DEBUG

-    fprintf(stderr, "Sync Extension %d.%d\n",

-	    SYNC_MAJOR_VERSION, SYNC_MINOR_VERSION);

-#endif

-}

-

-

-/*

- * ***** SERVERTIME implementation - should go in its own file in OS directory?

- */

-

-

-

-static pointer ServertimeCounter;

-static XSyncValue Now;

-static XSyncValue *pnext_time;

-

-#define GetTime()\

-{\

-    unsigned long millis = GetTimeInMillis();\

-    unsigned long maxis = XSyncValueHigh32(Now);\

-    if (millis < XSyncValueLow32(Now)) maxis++;\

-    XSyncIntsToValue(&Now, millis, maxis);\

-}

-

-/*

-*** Server Block Handler

-*** code inspired by multibuffer extension (now deprecated)

- */

-/*ARGSUSED*/

-static void

-ServertimeBlockHandler(void *env, struct timeval **wt, void *LastSelectMask)

-{

-    XSyncValue delay;

-    unsigned long timeout;

-

-    if (pnext_time)

-    {

-        GetTime();

-

-        if (XSyncValueGreaterOrEqual(Now, *pnext_time))

-	{

-            timeout = 0;

-        }

-	else

-	{

-	    Bool overflow;

-            XSyncValueSubtract(&delay, *pnext_time, Now, &overflow);

-	    (void)overflow;

-            timeout = XSyncValueLow32(delay);

-        }

-        AdjustWaitForDelay(wt, timeout); /* os/utils.c */

-    }

-}

-

-/*

-*** Wakeup Handler

- */

-/*ARGSUSED*/

-static void

-ServertimeWakeupHandler(void *env, int rc, void *LastSelectMask)

-{

-    if (pnext_time)

-    {

-        GetTime();

-

-        if (XSyncValueGreaterOrEqual(Now, *pnext_time))

-	{

-            SyncChangeCounter(ServertimeCounter, Now);

-        }

-    }

-}

-

-static void

-ServertimeQueryValue(void *pCounter, CARD64 *pValue_return)

-{

-    GetTime();

-    *pValue_return = Now;

-}

-

-static void

-ServertimeBracketValues(void *pCounter, CARD64 *pbracket_less,

-			CARD64 *pbracket_greater)

-{

-    if (!pnext_time && pbracket_greater)

-    {

-	RegisterBlockAndWakeupHandlers(ServertimeBlockHandler,

-				       ServertimeWakeupHandler,

-				       NULL);

-    }

-    else if (pnext_time && !pbracket_greater)

-    {

-	RemoveBlockAndWakeupHandlers(ServertimeBlockHandler,

-				     ServertimeWakeupHandler,

-				     NULL);

-    }

-    pnext_time = pbracket_greater;

-}

-

-static void

-SyncInitServerTime(void)

-{

-    CARD64 resolution;

-

-    XSyncIntsToValue(&Now, GetTimeInMillis(), 0);

-    XSyncIntToValue(&resolution, 4);

-    ServertimeCounter = SyncCreateSystemCounter("SERVERTIME", Now, resolution,

-			    XSyncCounterNeverDecreases,

-			    ServertimeQueryValue, ServertimeBracketValues);

-    pnext_time = NULL;

-}

-

-

-

-/*

- * IDLETIME implementation

- */

-

-static SyncCounter *IdleTimeCounter;

-static XSyncValue *pIdleTimeValueLess;

-static XSyncValue *pIdleTimeValueGreater;

-

-static void

-IdleTimeQueryValue (pointer pCounter, CARD64 *pValue_return)

-{

-    CARD32 idle = GetTimeInMillis() - lastDeviceEventTime.milliseconds;

-    XSyncIntsToValue (pValue_return, idle, 0);

-}

-

-static void

-IdleTimeBlockHandler(pointer env, struct timeval **wt, pointer LastSelectMask)

-{

-    XSyncValue idle, old_idle;

-    SyncTriggerList *list = IdleTimeCounter->pTriglist;

-    SyncTrigger *trig;

-

-    if (!pIdleTimeValueLess && !pIdleTimeValueGreater)

-	return;

-

-    old_idle = IdleTimeCounter->value;

-    IdleTimeQueryValue (NULL, &idle);

-    IdleTimeCounter->value = idle; /* push, so CheckTrigger works */

-

-    if (pIdleTimeValueLess &&

-        XSyncValueLessOrEqual (idle, *pIdleTimeValueLess))

-    {

-	/*

-	 * We've been idle for less than the threshold value, and someone

-	 * wants to know about that, but now we need to know whether they

-	 * want level or edge trigger.  Check the trigger list against the

-	 * current idle time, and if any succeed, bomb out of select()

-	 * immediately so we can reschedule.

-	 */

-

-	for (list = IdleTimeCounter->pTriglist; list; list = list->next) {

-	    trig = list->pTrigger;

-	    if (trig->CheckTrigger(trig, old_idle)) {

-		AdjustWaitForDelay(wt, 0);

-		break;

-	    }

-	}

-    }

-    else if (pIdleTimeValueGreater)

-    {

-	/*

-	 * There's a threshold in the positive direction.  If we've been

-	 * idle less than it, schedule a wakeup for sometime in the future.

-	 * If we've been idle more than it, and someone wants to know about

-	 * that level-triggered, schedule an immediate wakeup.

-	 */

-	unsigned long timeout = -1;

-

-	if (XSyncValueLessThan (idle, *pIdleTimeValueGreater)) {

-	    XSyncValue value;

-	    Bool overflow;

-

-	    XSyncValueSubtract (&value, *pIdleTimeValueGreater,

-	                        idle, &overflow);

-	    timeout = min(timeout, XSyncValueLow32 (value));

-	} else {

-	    for (list = IdleTimeCounter->pTriglist; list; list = list->next) {

-		trig = list->pTrigger;

-		if (trig->CheckTrigger(trig, old_idle)) {

-		    timeout = min(timeout, 0);

-		    break;

-		}

-	    }

-	}

-

-	AdjustWaitForDelay (wt, timeout);

-    }

-

-    IdleTimeCounter->value = old_idle; /* pop */

-}

-

-static void

-IdleTimeWakeupHandler (pointer env, int rc, pointer LastSelectMask)

-{

-    XSyncValue idle;

-

-    if (!pIdleTimeValueLess && !pIdleTimeValueGreater)

-	return;

-

-    IdleTimeQueryValue (NULL, &idle);

-

-    if ((pIdleTimeValueGreater &&

-         XSyncValueGreaterOrEqual (idle, *pIdleTimeValueGreater)) ||

-        (pIdleTimeValueLess &&

-	 XSyncValueLessOrEqual (idle, *pIdleTimeValueLess)))

-    {

-	SyncChangeCounter (IdleTimeCounter, idle);

-    }

-}

-

-static void

-IdleTimeBracketValues (pointer pCounter, CARD64 *pbracket_less,

-                       CARD64 *pbracket_greater)

-{

-    Bool registered = (pIdleTimeValueLess || pIdleTimeValueGreater);

-

-    if (registered && !pbracket_less && !pbracket_greater)

-    {

-	RemoveBlockAndWakeupHandlers(IdleTimeBlockHandler,

-	                             IdleTimeWakeupHandler,

-	                             NULL);

-    }

-    else if (!registered && (pbracket_less || pbracket_greater))

-    {

-	RegisterBlockAndWakeupHandlers(IdleTimeBlockHandler,

-	                               IdleTimeWakeupHandler,

-	                               NULL);

-    }

-

-    pIdleTimeValueGreater = pbracket_greater;

-    pIdleTimeValueLess    = pbracket_less;

-}

-

-static void

-SyncInitIdleTime (void)

-{

-    CARD64 resolution;

-    XSyncValue idle;

-

-    IdleTimeQueryValue (NULL, &idle);

-    XSyncIntToValue (&resolution, 4);

-

-    IdleTimeCounter = SyncCreateSystemCounter ("IDLETIME", idle, resolution,

-                                               XSyncCounterUnrestricted,

-                                               IdleTimeQueryValue,

-                                               IdleTimeBracketValues);

-

-    pIdleTimeValueLess = pIdleTimeValueGreater = NULL;

-}

+/*
+
+Copyright 1991, 1993, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall
+not be used in advertising or otherwise to promote the sale, use or
+other dealings in this Software without prior written authorization
+from The Open Group.
+
+
+Copyright 1991, 1993 by Digital Equipment Corporation, Maynard, Massachusetts,
+and Olivetti Research Limited, Cambridge, England.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the names of Digital or Olivetti
+not be used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.  Digital and Olivetti
+make no representations about the suitability of this software
+for any purpose.  It is provided "as is" without express or implied warranty.
+
+DIGITAL AND OLIVETTI DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL THEY BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
+USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.
+
+*/
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <string.h>
+
+#include <X11/X.h>
+#include <X11/Xproto.h>
+#include <X11/Xmd.h>
+#include "misc.h"
+#include "os.h"
+#include "extnsionst.h"
+#include "dixstruct.h"
+#include "resource.h"
+#include "opaque.h"
+#include <X11/extensions/syncproto.h>
+#include "syncsrv.h"
+
+#include <stdio.h>
+#if !defined(WIN32)
+#include <sys/time.h>
+#endif
+
+#include "modinit.h"
+
+/*
+ * Local Global Variables
+ */
+static int      SyncEventBase;
+static int      SyncErrorBase;
+static RESTYPE  RTCounter = 0;
+static RESTYPE  RTAwait;
+static RESTYPE  RTAlarm;
+static RESTYPE  RTAlarmClient;
+static int SyncNumSystemCounters = 0;
+static SyncCounter **SysCounterList = NULL;
+
+#define IsSystemCounter(pCounter) \
+    (pCounter && (pCounter->client == NULL))
+
+/* these are all the alarm attributes that pertain to the alarm's trigger */
+#define XSyncCAAllTrigger \
+    (XSyncCACounter | XSyncCAValueType | XSyncCAValue | XSyncCATestType)
+
+static void SyncComputeBracketValues(SyncCounter *);
+
+static void SyncInitServerTime(void);
+
+static void SyncInitIdleTime(void);
+
+static DISPATCH_PROC(ProcSyncAwait);
+static DISPATCH_PROC(ProcSyncChangeAlarm);
+static DISPATCH_PROC(ProcSyncChangeCounter);
+static DISPATCH_PROC(ProcSyncCreateAlarm);
+static DISPATCH_PROC(ProcSyncCreateCounter);
+static DISPATCH_PROC(ProcSyncDestroyAlarm);
+static DISPATCH_PROC(ProcSyncDestroyCounter);
+static DISPATCH_PROC(ProcSyncDispatch);
+static DISPATCH_PROC(ProcSyncGetPriority);
+static DISPATCH_PROC(ProcSyncInitialize);
+static DISPATCH_PROC(ProcSyncListSystemCounters);
+static DISPATCH_PROC(ProcSyncQueryAlarm);
+static DISPATCH_PROC(ProcSyncQueryCounter);
+static DISPATCH_PROC(ProcSyncSetCounter);
+static DISPATCH_PROC(ProcSyncSetPriority);
+static DISPATCH_PROC(SProcSyncAwait);
+static DISPATCH_PROC(SProcSyncChangeAlarm);
+static DISPATCH_PROC(SProcSyncChangeCounter);
+static DISPATCH_PROC(SProcSyncCreateAlarm);
+static DISPATCH_PROC(SProcSyncCreateCounter);
+static DISPATCH_PROC(SProcSyncDestroyAlarm);
+static DISPATCH_PROC(SProcSyncDestroyCounter);
+static DISPATCH_PROC(SProcSyncDispatch);
+static DISPATCH_PROC(SProcSyncGetPriority);
+static DISPATCH_PROC(SProcSyncInitialize);
+static DISPATCH_PROC(SProcSyncListSystemCounters);
+static DISPATCH_PROC(SProcSyncQueryAlarm);
+static DISPATCH_PROC(SProcSyncQueryCounter);
+static DISPATCH_PROC(SProcSyncSetCounter);
+static DISPATCH_PROC(SProcSyncSetPriority);
+
+/*  Each counter maintains a simple linked list of triggers that are
+ *  interested in the counter.  The two functions below are used to
+ *  delete and add triggers on this list.
+ */
+static void
+SyncDeleteTriggerFromCounter(SyncTrigger *pTrigger)
+{
+    SyncTriggerList *pCur;
+    SyncTriggerList *pPrev;
+
+    /* pCounter needs to be stored in pTrigger before calling here. */
+
+    if (!pTrigger->pCounter)
+	return;
+
+    pPrev = NULL;
+    pCur = pTrigger->pCounter->pTriglist;
+
+    while (pCur)
+    {
+	if (pCur->pTrigger == pTrigger)
+	{
+	    if (pPrev)
+		pPrev->next = pCur->next;
+	    else
+		pTrigger->pCounter->pTriglist = pCur->next;
+
+	    free(pCur);
+	    break;
+	}
+	
+	pPrev = pCur;
+	pCur = pCur->next;
+    }
+
+    if (IsSystemCounter(pTrigger->pCounter))
+	SyncComputeBracketValues(pTrigger->pCounter);
+}
+
+
+static int
+SyncAddTriggerToCounter(SyncTrigger *pTrigger)
+{
+    SyncTriggerList *pCur;
+
+    if (!pTrigger->pCounter)
+	return Success;
+
+    /* don't do anything if it's already there */
+    for (pCur = pTrigger->pCounter->pTriglist; pCur; pCur = pCur->next)
+    {
+	if (pCur->pTrigger == pTrigger)
+	    return Success;
+    }
+
+    if (!(pCur = malloc(sizeof(SyncTriggerList))))
+	return BadAlloc;
+
+    pCur->pTrigger = pTrigger;
+    pCur->next = pTrigger->pCounter->pTriglist;
+    pTrigger->pCounter->pTriglist = pCur;
+
+    if (IsSystemCounter(pTrigger->pCounter))
+	SyncComputeBracketValues(pTrigger->pCounter);
+
+    return Success;
+}
+
+
+/*  Below are four possible functions that can be plugged into
+ *  pTrigger->CheckTrigger, corresponding to the four possible
+ *  test-types.  These functions are called after the counter's
+ *  value changes but are also passed the old counter value
+ *  so they can inspect both the old and new values.
+ *  (PositiveTransition and NegativeTransition need to see both
+ *  pieces of information.)  These functions return the truth value
+ *  of the trigger.
+ *
+ *  All of them include the condition pTrigger->pCounter == NULL.
+ *  This is because the spec says that a trigger with a counter value
+ *  of None is always TRUE.
+ */
+
+static Bool
+SyncCheckTriggerPositiveComparison(SyncTrigger *pTrigger, CARD64 oldval)
+{
+    return (pTrigger->pCounter == NULL ||
+	    XSyncValueGreaterOrEqual(pTrigger->pCounter->value,
+				     pTrigger->test_value));
+}
+
+static Bool
+SyncCheckTriggerNegativeComparison(SyncTrigger *pTrigger,  CARD64 oldval)
+{
+    return (pTrigger->pCounter == NULL ||
+	    XSyncValueLessOrEqual(pTrigger->pCounter->value,
+				  pTrigger->test_value));
+}
+
+static Bool
+SyncCheckTriggerPositiveTransition(SyncTrigger *pTrigger, CARD64 oldval)
+{
+    return (pTrigger->pCounter == NULL ||
+	    (XSyncValueLessThan(oldval, pTrigger->test_value) &&
+	     XSyncValueGreaterOrEqual(pTrigger->pCounter->value,
+				      pTrigger->test_value)));
+}
+
+static Bool
+SyncCheckTriggerNegativeTransition(SyncTrigger *pTrigger, CARD64 oldval)
+{
+    return (pTrigger->pCounter == NULL ||
+	    (XSyncValueGreaterThan(oldval, pTrigger->test_value) &&
+	     XSyncValueLessOrEqual(pTrigger->pCounter->value,
+				   pTrigger->test_value)));
+}
+
+static int
+SyncInitTrigger(ClientPtr client, SyncTrigger *pTrigger, XSyncCounter counter,
+		Mask changes)
+{
+    SyncCounter *pCounter = pTrigger->pCounter;
+    int		rc;
+    Bool	newcounter = FALSE;
+
+    if (changes & XSyncCACounter)
+    {
+	if (counter == None)
+	    pCounter = NULL;
+	else if (Success != (rc = dixLookupResourceByType ((pointer *)&pCounter,
+				counter, RTCounter, client, DixReadAccess)))
+	{
+	    client->errorValue = counter;
+	    return (rc == BadValue) ? SyncErrorBase + XSyncBadCounter : rc;
+	}
+	if (pCounter != pTrigger->pCounter)
+	{ /* new counter for trigger */
+	    SyncDeleteTriggerFromCounter(pTrigger);
+	    pTrigger->pCounter = pCounter;
+	    newcounter = TRUE;
+	}
+    }
+
+    /* if system counter, ask it what the current value is */
+
+    if (IsSystemCounter(pCounter))
+    {
+	(*pCounter->pSysCounterInfo->QueryValue) ((pointer) pCounter,
+						  &pCounter->value);
+    }
+
+    if (changes & XSyncCAValueType)
+    {
+	if (pTrigger->value_type != XSyncRelative &&
+	    pTrigger->value_type != XSyncAbsolute)
+	{
+	    client->errorValue = pTrigger->value_type;
+	    return BadValue;
+	}
+    }
+
+    if (changes & XSyncCATestType)
+    {
+	if (pTrigger->test_type != XSyncPositiveTransition &&
+	    pTrigger->test_type != XSyncNegativeTransition &&
+	    pTrigger->test_type != XSyncPositiveComparison &&
+	    pTrigger->test_type != XSyncNegativeComparison)
+	{
+	    client->errorValue = pTrigger->test_type;
+	    return BadValue;
+	}
+	/* select appropriate CheckTrigger function */
+
+	switch (pTrigger->test_type)
+	{
+        case XSyncPositiveTransition:
+	    pTrigger->CheckTrigger = SyncCheckTriggerPositiveTransition;
+	    break;
+        case XSyncNegativeTransition:
+	    pTrigger->CheckTrigger = SyncCheckTriggerNegativeTransition;
+	    break;
+        case XSyncPositiveComparison:
+	    pTrigger->CheckTrigger = SyncCheckTriggerPositiveComparison;
+	    break;
+        case XSyncNegativeComparison:
+	    pTrigger->CheckTrigger = SyncCheckTriggerNegativeComparison;
+	    break;
+	}
+    }
+
+    if (changes & (XSyncCAValueType | XSyncCAValue))
+    {
+	if (pTrigger->value_type == XSyncAbsolute)
+	    pTrigger->test_value = pTrigger->wait_value;
+	else /* relative */
+	{
+	    Bool overflow;
+	    if (pCounter == NULL)
+		return BadMatch;
+
+	    XSyncValueAdd(&pTrigger->test_value, pCounter->value,
+			  pTrigger->wait_value, &overflow);
+	    if (overflow)
+	    {
+		client->errorValue = XSyncValueHigh32(pTrigger->wait_value);
+		return BadValue;
+	    }
+	}
+    }
+
+    /*  we wait until we're sure there are no errors before registering
+     *  a new counter on a trigger
+     */
+    if (newcounter)
+    {
+	if ((rc = SyncAddTriggerToCounter(pTrigger)) != Success)
+	    return rc;
+    }
+    else if (IsSystemCounter(pCounter))
+    {
+	SyncComputeBracketValues(pCounter);
+    }
+
+    return Success;
+}
+
+/*  AlarmNotify events happen in response to actions taken on an Alarm or
+ *  the counter used by the alarm.  AlarmNotify may be sent to multiple
+ *  clients.  The alarm maintains a list of clients interested in events.
+ */
+static void
+SyncSendAlarmNotifyEvents(SyncAlarm *pAlarm)
+{
+    SyncAlarmClientList *pcl;
+    xSyncAlarmNotifyEvent ane;
+    SyncTrigger *pTrigger = &pAlarm->trigger;
+
+    UpdateCurrentTime();
+
+    ane.type = SyncEventBase + XSyncAlarmNotify;
+    ane.kind = XSyncAlarmNotify;
+    ane.sequenceNumber = pAlarm->client->sequence;
+    ane.alarm = pAlarm->alarm_id;
+    if (pTrigger->pCounter)
+    {
+	ane.counter_value_hi = XSyncValueHigh32(pTrigger->pCounter->value);
+	ane.counter_value_lo = XSyncValueLow32(pTrigger->pCounter->value);
+    }
+    else
+    { /* XXX what else can we do if there's no counter? */
+	ane.counter_value_hi = ane.counter_value_lo = 0;
+    }
+
+    ane.alarm_value_hi = XSyncValueHigh32(pTrigger->test_value);
+    ane.alarm_value_lo = XSyncValueLow32(pTrigger->test_value);
+    ane.time = currentTime.milliseconds;
+    ane.state = pAlarm->state;
+
+    /* send to owner */
+    if (pAlarm->events && !pAlarm->client->clientGone)
+	WriteEventsToClient(pAlarm->client, 1, (xEvent *) &ane);
+
+    /* send to other interested clients */
+    for (pcl = pAlarm->pEventClients; pcl; pcl = pcl->next)
+    {
+	if (!pcl->client->clientGone)
+	{
+	    ane.sequenceNumber = pcl->client->sequence;
+	    WriteEventsToClient(pcl->client, 1, (xEvent *) &ane);
+	}
+    }
+}
+
+
+/*  CounterNotify events only occur in response to an Await.  The events
+ *  go only to the Awaiting client.
+ */
+static void
+SyncSendCounterNotifyEvents(ClientPtr client, SyncAwait **ppAwait,
+			    int num_events)
+{
+    xSyncCounterNotifyEvent *pEvents, *pev;
+    int i;
+
+    if (client->clientGone)
+	return;
+    pev = pEvents = malloc(num_events * sizeof(xSyncCounterNotifyEvent));
+    if (!pEvents)
+	return;
+    UpdateCurrentTime();
+    for (i = 0; i < num_events; i++, ppAwait++, pev++)
+    {
+	SyncTrigger *pTrigger = &(*ppAwait)->trigger;
+	pev->type = SyncEventBase + XSyncCounterNotify;
+	pev->kind = XSyncCounterNotify;
+	pev->sequenceNumber = client->sequence;
+	pev->counter = pTrigger->pCounter->id;
+	pev->wait_value_lo = XSyncValueLow32(pTrigger->test_value);
+	pev->wait_value_hi = XSyncValueHigh32(pTrigger->test_value);
+	pev->counter_value_lo = XSyncValueLow32(pTrigger->pCounter->value);
+	pev->counter_value_hi = XSyncValueHigh32(pTrigger->pCounter->value);
+	pev->time = currentTime.milliseconds;
+	pev->count = num_events - i - 1; /* events remaining */
+	pev->destroyed = pTrigger->pCounter->beingDestroyed;
+    }
+    /* swapping will be taken care of by this */
+    WriteEventsToClient(client, num_events, (xEvent *)pEvents);
+    free(pEvents);
+}
+
+
+/* This function is called when an alarm's counter is destroyed.
+ * It is plugged into pTrigger->CounterDestroyed (for alarm triggers).
+ */
+static void
+SyncAlarmCounterDestroyed(SyncTrigger *pTrigger)
+{
+    SyncAlarm *pAlarm = (SyncAlarm *)pTrigger;
+
+    pAlarm->state = XSyncAlarmInactive;
+    SyncSendAlarmNotifyEvents(pAlarm);
+    pTrigger->pCounter = NULL;
+}
+
+
+/*  This function is called when an alarm "goes off."
+ *  It is plugged into pTrigger->TriggerFired (for alarm triggers).
+ */
+static void
+SyncAlarmTriggerFired(SyncTrigger *pTrigger)
+{
+    SyncAlarm *pAlarm = (SyncAlarm *)pTrigger;
+    CARD64 new_test_value;
+
+    /* no need to check alarm unless it's active */
+    if (pAlarm->state != XSyncAlarmActive)
+	return;
+
+    /*  " if the counter value is None, or if the delta is 0 and
+     *    the test-type is PositiveComparison or NegativeComparison,
+     *    no change is made to value (test-value) and the alarm
+     *    state is changed to Inactive before the event is generated."
+     */
+    if (pAlarm->trigger.pCounter == NULL
+	|| (XSyncValueIsZero(pAlarm->delta)
+	    && (pAlarm->trigger.test_type == XSyncPositiveComparison
+		|| pAlarm->trigger.test_type == XSyncNegativeComparison)))
+	pAlarm->state = XSyncAlarmInactive;
+
+    new_test_value = pAlarm->trigger.test_value;
+
+    if (pAlarm->state == XSyncAlarmActive)
+    {
+	Bool overflow;
+	CARD64 oldvalue;
+	SyncTrigger *paTrigger = &pAlarm->trigger;
+
+	/* "The alarm is updated by repeatedly adding delta to the
+	 *  value of the trigger and re-initializing it until it
+	 *  becomes FALSE."
+	 */
+	oldvalue = paTrigger->test_value;
+
+	/* XXX really should do something smarter here */
+
+	do
+	{
+	    XSyncValueAdd(&paTrigger->test_value, paTrigger->test_value,
+			  pAlarm->delta, &overflow);
+	} while (!overflow &&
+	      (*paTrigger->CheckTrigger)(paTrigger,
+					paTrigger->pCounter->value));
+
+	new_test_value = paTrigger->test_value;
+	paTrigger->test_value = oldvalue;
+
+	/* "If this update would cause value to fall outside the range
+	 *  for an INT64...no change is made to value (test-value) and
+	 *  the alarm state is changed to Inactive before the event is
+	 *  generated."
+	 */
+	if (overflow)
+	{
+	    new_test_value = oldvalue;
+	    pAlarm->state = XSyncAlarmInactive;
+	}
+    }
+    /*  The AlarmNotify event has to have the "new state of the alarm"
+     *  which we can't be sure of until this point.  However, it has
+     *  to have the "old" trigger test value.  That's the reason for
+     *  all the newvalue/oldvalue shuffling above.  After we send the
+     *  events, give the trigger its new test value.
+     */
+    SyncSendAlarmNotifyEvents(pAlarm);
+    pTrigger->test_value = new_test_value;
+}
+
+
+/*  This function is called when an Await unblocks, either as a result
+ *  of the trigger firing OR the counter being destroyed.
+ *  It goes into pTrigger->TriggerFired AND pTrigger->CounterDestroyed
+ *  (for Await triggers).
+ */
+static void
+SyncAwaitTriggerFired(SyncTrigger *pTrigger)
+{
+    SyncAwait *pAwait = (SyncAwait *)pTrigger;
+    int numwaits;
+    SyncAwaitUnion *pAwaitUnion;
+    SyncAwait **ppAwait;
+    int num_events = 0;
+
+    pAwaitUnion = (SyncAwaitUnion *)pAwait->pHeader;
+    numwaits = pAwaitUnion->header.num_waitconditions;
+    ppAwait = malloc(numwaits * sizeof(SyncAwait *));
+    if (!ppAwait)
+	goto bail;
+
+    pAwait = &(pAwaitUnion+1)->await;
+
+    /* "When a client is unblocked, all the CounterNotify events for
+     *  the Await request are generated contiguously. If count is 0
+     *  there are no more events to follow for this request. If
+     *  count is n, there are at least n more events to follow."
+     *
+     *  Thus, it is best to find all the counters for which events
+     *  need to be sent first, so that an accurate count field can
+     *  be stored in the events.
+     */
+    for ( ; numwaits; numwaits--, pAwait++)
+    {
+	CARD64 diff;
+	Bool overflow, diffgreater, diffequal;
+
+	/* "A CounterNotify event with the destroyed flag set to TRUE is
+	 *  always generated if the counter for one of the triggers is
+	 *  destroyed."
+	 */
+	if (pAwait->trigger.pCounter->beingDestroyed)
+	{
+	    ppAwait[num_events++] = pAwait;
+	    continue;
+	}
+
+	/* "The difference between the counter and the test value is
+	 *  calculated by subtracting the test value from the value of
+	 *  the counter."
+	 */
+	XSyncValueSubtract(&diff, pAwait->trigger.pCounter->value,
+			   pAwait->trigger.test_value, &overflow);
+
+	/* "If the difference lies outside the range for an INT64, an
+	 *  event is not generated."
+	 */
+	if (overflow)
+	    continue;
+	diffgreater = XSyncValueGreaterThan(diff, pAwait->event_threshold);
+	diffequal   = XSyncValueEqual(diff, pAwait->event_threshold);
+
+	/* "If the test-type is PositiveTransition or
+	 *  PositiveComparison, a CounterNotify event is generated if
+	 *  the difference is at least event-threshold. If the test-type
+	 *  is NegativeTransition or NegativeComparison, a CounterNotify
+	 *  event is generated if the difference is at most
+	 *  event-threshold."
+	 */
+
+	if ( ((pAwait->trigger.test_type == XSyncPositiveComparison ||
+	       pAwait->trigger.test_type == XSyncPositiveTransition)
+	       && (diffgreater || diffequal))
+	     ||
+	     ((pAwait->trigger.test_type == XSyncNegativeComparison ||
+	       pAwait->trigger.test_type == XSyncNegativeTransition)
+	      && (!diffgreater) /* less or equal */
+	      )
+	   )
+	{
+	    ppAwait[num_events++] = pAwait;
+	}
+    }
+    if (num_events)
+	SyncSendCounterNotifyEvents(pAwaitUnion->header.client, ppAwait,
+				    num_events);
+    free(ppAwait);
+
+bail:
+    /* unblock the client */
+    AttendClient(pAwaitUnion->header.client);
+    /* delete the await */
+    FreeResource(pAwaitUnion->header.delete_id, RT_NONE);
+}
+
+
+/*  This function should always be used to change a counter's value so that
+ *  any triggers depending on the counter will be checked.
+ */
+void
+SyncChangeCounter(SyncCounter *pCounter, CARD64 newval)
+{
+    SyncTriggerList       *ptl, *pnext;
+    CARD64 oldval;
+
+    oldval = pCounter->value;
+    pCounter->value = newval;
+
+    /* run through triggers to see if any become true */
+    for (ptl = pCounter->pTriglist; ptl; ptl = pnext)
+    {
+	pnext = ptl->next;
+	if ((*ptl->pTrigger->CheckTrigger)(ptl->pTrigger, oldval))
+	    (*ptl->pTrigger->TriggerFired)(ptl->pTrigger);
+    }
+
+    if (IsSystemCounter(pCounter))
+    {
+	SyncComputeBracketValues(pCounter);
+    }
+}
+
+
+/* loosely based on dix/events.c/EventSelectForWindow */
+static Bool
+SyncEventSelectForAlarm(SyncAlarm *pAlarm, ClientPtr client, Bool wantevents)
+{
+    SyncAlarmClientList *pClients;
+
+    if (client == pAlarm->client) /* alarm owner */
+    {
+	pAlarm->events = wantevents;
+	return Success;
+    }
+
+    /* see if the client is already on the list (has events selected) */
+
+    for (pClients = pAlarm->pEventClients; pClients;
+	 pClients = pClients->next)
+    {
+	if (pClients->client == client)
+	{
+	    /* client's presence on the list indicates desire for
+	     * events.  If the client doesn't want events, remove it
+	     * from the list.  If the client does want events, do
+	     * nothing, since it's already got them.
+	     */
+	    if (!wantevents)
+	    {
+		FreeResource(pClients->delete_id, RT_NONE);
+	    }
+	    return Success;
+	}
+    }
+
+    /*  if we get here, this client does not currently have
+     *  events selected on the alarm
+     */
+
+    if (!wantevents)
+	/* client doesn't want events, and we just discovered that it
+	 * doesn't have them, so there's nothing to do.
+	 */
+	return Success;
+
+    /* add new client to pAlarm->pEventClients */
+
+    pClients = malloc(sizeof(SyncAlarmClientList));
+    if (!pClients)
+	return BadAlloc;
+
+    /*  register it as a resource so it will be cleaned up
+     *  if the client dies
+     */
+
+    pClients->delete_id = FakeClientID(client->index);
+    if (!AddResource(pClients->delete_id, RTAlarmClient, pAlarm))
+    {
+	free(pClients);
+	return BadAlloc;
+    }
+
+    /* link it into list after we know all the allocations succeed */
+
+    pClients->next = pAlarm->pEventClients;
+    pAlarm->pEventClients = pClients;
+    pClients->client = client;
+    return Success;
+}
+
+/*
+ * ** SyncChangeAlarmAttributes ** This is used by CreateAlarm and ChangeAlarm
+ */
+static int
+SyncChangeAlarmAttributes(ClientPtr client, SyncAlarm *pAlarm, Mask mask,
+			  CARD32 *values)
+{
+    int		   status;
+    XSyncCounter   counter;
+    Mask	   origmask = mask;
+
+    counter = pAlarm->trigger.pCounter ? pAlarm->trigger.pCounter->id : None;
+
+    while (mask)
+    {
+	int    index2 = lowbit(mask);
+	mask &= ~index2;
+	switch (index2)
+	{
+	  case XSyncCACounter:
+	    mask &= ~XSyncCACounter;
+	    /* sanity check in SyncInitTrigger */
+	    counter = *values++;
+	    break;
+
+	  case XSyncCAValueType:
+	    mask &= ~XSyncCAValueType;
+	    /* sanity check in SyncInitTrigger */
+	    pAlarm->trigger.value_type = *values++;
+	    break;
+
+	  case XSyncCAValue:
+	    mask &= ~XSyncCAValue;
+	    XSyncIntsToValue(&pAlarm->trigger.wait_value, values[1], values[0]);
+	    values += 2;
+	    break;
+
+	  case XSyncCATestType:
+	    mask &= ~XSyncCATestType;
+	    /* sanity check in SyncInitTrigger */
+	    pAlarm->trigger.test_type = *values++;
+	    break;
+
+	  case XSyncCADelta:
+	    mask &= ~XSyncCADelta;
+	    XSyncIntsToValue(&pAlarm->delta, values[1], values[0]);
+	    values += 2;
+	    break;
+
+	  case XSyncCAEvents:
+	    mask &= ~XSyncCAEvents;
+	    if ((*values != xTrue) && (*values != xFalse))
+	    {
+		client->errorValue = *values;
+		return BadValue;
+	    }
+	    status = SyncEventSelectForAlarm(pAlarm, client,
+					     (Bool)(*values++));
+	    if (status != Success)
+		return status;
+	    break;
+
+	  default:
+	    client->errorValue = mask;
+	    return BadValue;
+	}
+    }
+
+    /* "If the test-type is PositiveComparison or PositiveTransition
+     *  and delta is less than zero, or if the test-type is
+     *  NegativeComparison or NegativeTransition and delta is
+     *  greater than zero, a Match error is generated."
+     */
+    if (origmask & (XSyncCADelta|XSyncCATestType))
+    {
+	CARD64 zero;
+	XSyncIntToValue(&zero, 0);
+	if ((((pAlarm->trigger.test_type == XSyncPositiveComparison) ||
+	      (pAlarm->trigger.test_type == XSyncPositiveTransition))
+	     && XSyncValueLessThan(pAlarm->delta, zero))
+	    ||
+	    (((pAlarm->trigger.test_type == XSyncNegativeComparison) ||
+	      (pAlarm->trigger.test_type == XSyncNegativeTransition))
+	     && XSyncValueGreaterThan(pAlarm->delta, zero))
+	   )
+	{
+	    return BadMatch;
+	}
+    }
+
+    /* postpone this until now, when we're sure nothing else can go wrong */
+    if ((status = SyncInitTrigger(client, &pAlarm->trigger, counter,
+			     origmask & XSyncCAAllTrigger)) != Success)
+	return status;
+
+    /* XXX spec does not really say to do this - needs clarification */
+    pAlarm->state = XSyncAlarmActive;
+    return Success;
+}
+
+
+static SyncCounter *
+SyncCreateCounter(ClientPtr client, XSyncCounter id, CARD64 initialvalue)
+{
+    SyncCounter *pCounter;
+
+    if (!(pCounter = malloc(sizeof(SyncCounter))))
+	return NULL;
+
+    if (!AddResource(id, RTCounter, (pointer) pCounter))
+    {
+	free(pCounter);
+	return NULL;
+    }
+
+    pCounter->client = client;
+    pCounter->id = id;
+    pCounter->value = initialvalue;
+    pCounter->pTriglist = NULL;
+    pCounter->beingDestroyed = FALSE;
+    pCounter->pSysCounterInfo = NULL;
+    return pCounter;
+}
+
+static int FreeCounter(void *, XID);
+
+/*
+ * ***** System Counter utilities
+ */
+
+pointer
+SyncCreateSystemCounter(
+	char *name,
+	CARD64 initial,
+	CARD64 resolution,
+	SyncCounterType counterType,
+	void (*QueryValue)(pointer /* pCounter */,
+	      	           CARD64 * /* pValue_return */),
+	void (*BracketValues)(pointer /* pCounter */,
+	       	              CARD64 * /* pbracket_less */,
+	                      CARD64 * /* pbracket_greater */)
+	)
+{
+    SyncCounter    *pCounter;
+
+    SysCounterList = realloc(SysCounterList,
+			    (SyncNumSystemCounters+1)*sizeof(SyncCounter *));
+    if (!SysCounterList)
+	return NULL;
+
+    /* this function may be called before SYNC has been initialized, so we
+     * have to make sure RTCounter is created.
+     */
+    if (RTCounter == 0)
+    {
+	RTCounter = CreateNewResourceType(FreeCounter, "SyncCounter");
+	if (RTCounter == 0)
+	{
+	    return NULL;
+	}
+    }
+
+    pCounter = SyncCreateCounter(NULL, FakeClientID(0), initial);
+
+    if (pCounter)
+    {
+	SysCounterInfo *psci;
+
+	psci = malloc(sizeof(SysCounterInfo));
+	if (!psci)
+	{
+	    FreeResource(pCounter->id, RT_NONE);
+	    return pCounter;
+	}
+	pCounter->pSysCounterInfo = psci;
+	psci->name = name;
+	psci->resolution = resolution;
+	psci->counterType = counterType;
+	psci->QueryValue = QueryValue;
+	psci->BracketValues = BracketValues;
+	XSyncMaxValue(&psci->bracket_greater);
+	XSyncMinValue(&psci->bracket_less);
+	SysCounterList[SyncNumSystemCounters++] = pCounter;
+    }
+    return pCounter;
+}
+
+void
+SyncDestroySystemCounter(pointer pSysCounter)
+{
+    SyncCounter *pCounter = (SyncCounter *)pSysCounter;
+    FreeResource(pCounter->id, RT_NONE);
+}
+
+static void
+SyncComputeBracketValues(SyncCounter *pCounter)
+{
+    SyncTriggerList *pCur;
+    SyncTrigger *pTrigger;
+    SysCounterInfo *psci;
+    CARD64 *pnewgtval = NULL;
+    CARD64 *pnewltval = NULL;
+    SyncCounterType ct;
+
+    if (!pCounter)
+	return;
+
+    psci = pCounter->pSysCounterInfo;
+    ct = pCounter->pSysCounterInfo->counterType;
+    if (ct == XSyncCounterNeverChanges)
+	return;
+
+    XSyncMaxValue(&psci->bracket_greater);
+    XSyncMinValue(&psci->bracket_less);
+
+    for (pCur = pCounter->pTriglist; pCur; pCur = pCur->next)
+    {
+	pTrigger = pCur->pTrigger;
+	
+        if (pTrigger->test_type == XSyncPositiveComparison &&
+	    ct != XSyncCounterNeverIncreases)
+	{
+	    if (XSyncValueLessThan(pCounter->value, pTrigger->test_value) &&
+		XSyncValueLessThan(pTrigger->test_value,
+				   psci->bracket_greater))
+	    {
+		psci->bracket_greater = pTrigger->test_value;
+		pnewgtval = &psci->bracket_greater;
+	    }
+	}
+	else if (pTrigger->test_type == XSyncNegativeComparison &&
+		 ct != XSyncCounterNeverDecreases)
+	{
+	    if (XSyncValueGreaterThan(pCounter->value, pTrigger->test_value) &&
+		XSyncValueGreaterThan(pTrigger->test_value,
+				      psci->bracket_less))
+	    {
+		psci->bracket_less = pTrigger->test_value;
+		pnewltval = &psci->bracket_less;
+	    }
+	}
+	else if (pTrigger->test_type == XSyncNegativeTransition &&
+		   ct != XSyncCounterNeverIncreases)
+	{
+	    if (XSyncValueGreaterThan(pCounter->value, pTrigger->test_value) &&
+		XSyncValueGreaterThan(pTrigger->test_value, psci->bracket_less))
+	    {
+		psci->bracket_less = pTrigger->test_value;
+		pnewltval = &psci->bracket_less;
+	    }
+	}
+        else if (pTrigger->test_type == XSyncPositiveTransition &&
+		  ct != XSyncCounterNeverDecreases)
+	{
+	    if (XSyncValueLessThan(pCounter->value, pTrigger->test_value) &&
+		XSyncValueLessThan(pTrigger->test_value, psci->bracket_greater))
+	    {
+		psci->bracket_greater = pTrigger->test_value;
+		pnewgtval = &psci->bracket_greater;
+	    }
+	}
+    } /* end for each trigger */
+
+    if (pnewgtval || pnewltval)
+    {
+	(*psci->BracketValues)((pointer)pCounter, pnewltval, pnewgtval);
+    }
+}
+
+/*
+ * *****  Resource delete functions
+ */
+
+/* ARGSUSED */
+static int
+FreeAlarm(void *addr, XID id)
+{
+    SyncAlarm      *pAlarm = (SyncAlarm *) addr;
+
+    pAlarm->state = XSyncAlarmDestroyed;
+
+    SyncSendAlarmNotifyEvents(pAlarm);
+
+    /* delete event selections */
+
+    while (pAlarm->pEventClients)
+	FreeResource(pAlarm->pEventClients->delete_id, RT_NONE);
+
+    SyncDeleteTriggerFromCounter(&pAlarm->trigger);
+
+    free(pAlarm);
+    return Success;
+}
+
+
+/*
+ * ** Cleanup after the destruction of a Counter
+ */
+/* ARGSUSED */
+static int
+FreeCounter(void *env, XID id)
+{
+    SyncCounter     *pCounter = (SyncCounter *) env;
+    SyncTriggerList *ptl, *pnext;
+
+    pCounter->beingDestroyed = TRUE;
+    /* tell all the counter's triggers that the counter has been destroyed */
+    for (ptl = pCounter->pTriglist; ptl; ptl = pnext)
+    {
+	(*ptl->pTrigger->CounterDestroyed)(ptl->pTrigger);
+	pnext = ptl->next;
+	free(ptl); /* destroy the trigger list as we go */
+    }
+    if (IsSystemCounter(pCounter))
+    {
+	int i, found = 0;
+
+	free(pCounter->pSysCounterInfo);
+
+	/* find the counter in the list of system counters and remove it */
+
+	if (SysCounterList)
+	{
+	    for (i = 0; i < SyncNumSystemCounters; i++)
+	    {
+		if (SysCounterList[i] == pCounter)
+		{
+		    found = i;
+		    break;
+		}
+	    }
+	    if (found < (SyncNumSystemCounters-1))
+	    {
+		for (i = found; i < SyncNumSystemCounters-1; i++)
+		{
+		    SysCounterList[i] = SysCounterList[i+1];
+		}
+	    }
+	}
+	SyncNumSystemCounters--;
+    }
+    free(pCounter);
+    return Success;
+}
+
+/*
+ * ** Cleanup after Await
+ */
+/* ARGSUSED */
+static int
+FreeAwait(void *addr, XID id)
+{
+    SyncAwaitUnion *pAwaitUnion = (SyncAwaitUnion *) addr;
+    SyncAwait *pAwait;
+    int numwaits;
+
+    pAwait = &(pAwaitUnion+1)->await; /* first await on list */
+
+    /* remove triggers from counters */
+
+    for (numwaits = pAwaitUnion->header.num_waitconditions; numwaits;
+	 numwaits--, pAwait++)
+    {
+	/* If the counter is being destroyed, FreeCounter will delete
+	 * the trigger list itself, so don't do it here.
+	 */
+	SyncCounter *pCounter = pAwait->trigger.pCounter;
+	if (pCounter && !pCounter->beingDestroyed)
+	    SyncDeleteTriggerFromCounter(&pAwait->trigger);
+    }
+    free(pAwaitUnion);
+    return Success;
+}
+
+/* loosely based on dix/events.c/OtherClientGone */
+static int
+FreeAlarmClient(void *value, XID id)
+{
+    SyncAlarm *pAlarm = (SyncAlarm *)value;
+    SyncAlarmClientList *pCur, *pPrev;
+
+    for (pPrev = NULL, pCur = pAlarm->pEventClients;
+	 pCur;
+	 pPrev = pCur, pCur = pCur->next)
+    {
+	if (pCur->delete_id == id)
+	{
+	    if (pPrev)
+		pPrev->next = pCur->next;
+	    else
+		pAlarm->pEventClients = pCur->next;
+	    free(pCur);
+	    return Success;
+	}
+    }
+    FatalError("alarm client not on event list");
+    /*NOTREACHED*/
+}
+
+
+/*
+ * *****  Proc functions
+ */
+
+
+/*
+ * ** Initialize the extension
+ */
+static int
+ProcSyncInitialize(ClientPtr client)
+{
+    xSyncInitializeReply  rep;
+    int   n;
+
+    REQUEST_SIZE_MATCH(xSyncInitializeReq);
+
+    memset(&rep, 0, sizeof(xSyncInitializeReply));
+    rep.type = X_Reply;
+    rep.sequenceNumber = client->sequence;
+    rep.majorVersion = SYNC_MAJOR_VERSION;
+    rep.minorVersion = SYNC_MINOR_VERSION;
+    rep.length = 0;
+
+    if (client->swapped)
+    {
+	swaps(&rep.sequenceNumber, n);
+    }
+    WriteToClient(client, sizeof(rep), (char *) &rep);
+    return Success;
+}
+
+/*
+ * ** Get list of system counters available through the extension
+ */
+static int
+ProcSyncListSystemCounters(ClientPtr client)
+{
+    xSyncListSystemCountersReply  rep;
+    int i, len;
+    xSyncSystemCounter *list = NULL, *walklist = NULL;
+
+    REQUEST_SIZE_MATCH(xSyncListSystemCountersReq);
+
+    rep.type = X_Reply;
+    rep.sequenceNumber = client->sequence;
+    rep.nCounters = SyncNumSystemCounters;
+
+    for (i = len = 0; i < SyncNumSystemCounters; i++)
+    {
+	char *name = SysCounterList[i]->pSysCounterInfo->name;
+	/* pad to 4 byte boundary */
+	len += pad_to_int32(sz_xSyncSystemCounter + strlen(name));
+    }
+
+    if (len)
+    {
+	walklist = list = malloc(len);
+	if (!list)
+	    return BadAlloc;
+    }
+
+    rep.length = bytes_to_int32(len);
+
+    if (client->swapped)
+    {
+	char n;
+	swaps(&rep.sequenceNumber, n);
+	swapl(&rep.length, n);
+	swapl(&rep.nCounters, n);
+    }
+
+    for (i = 0; i < SyncNumSystemCounters; i++)
+    {
+	int namelen;
+	char *pname_in_reply;
+	SysCounterInfo *psci = SysCounterList[i]->pSysCounterInfo;
+
+	walklist->counter = SysCounterList[i]->id;
+	walklist->resolution_hi = XSyncValueHigh32(psci->resolution);
+	walklist->resolution_lo = XSyncValueLow32(psci->resolution);
+	namelen = strlen(psci->name);
+	walklist->name_length = namelen;
+
+	if (client->swapped)
+	{
+	    char n;
+	    swapl(&walklist->counter, n);
+	    swapl(&walklist->resolution_hi, n);
+	    swapl(&walklist->resolution_lo, n);
+	    swaps(&walklist->name_length, n);
+	}
+
+	pname_in_reply = ((char *)walklist) + sz_xSyncSystemCounter;
+	strncpy(pname_in_reply, psci->name, namelen);
+	walklist = (xSyncSystemCounter *) (((char *)walklist) +
+				pad_to_int32(sz_xSyncSystemCounter + namelen));
+    }
+
+    WriteToClient(client, sizeof(rep), (char *) &rep);
+    if (len)
+    {
+	WriteToClient(client, len, (char *) list);
+	free(list);
+    }
+
+    return Success;
+}
+
+/*
+ * ** Set client Priority
+ */
+static int
+ProcSyncSetPriority(ClientPtr client)
+{
+    REQUEST(xSyncSetPriorityReq);
+    ClientPtr priorityclient;
+    int rc;
+
+    REQUEST_SIZE_MATCH(xSyncSetPriorityReq);
+
+    if (stuff->id == None)
+	priorityclient = client;
+    else {
+	rc = dixLookupClient(&priorityclient, stuff->id, client,
+			     DixSetAttrAccess);
+	if (rc != Success)
+	    return rc;
+    }
+
+    if (priorityclient->priority != stuff->priority)
+    {
+	priorityclient->priority = stuff->priority;
+
+	/*  The following will force the server back into WaitForSomething
+	 *  so that the change in this client's priority is immediately
+	 *  reflected.
+	 */
+	isItTimeToYield = TRUE;
+	dispatchException |= DE_PRIORITYCHANGE;
+    }
+    return Success;
+}
+
+/*
+ * ** Get client Priority
+ */
+static int
+ProcSyncGetPriority(ClientPtr client)
+{
+    REQUEST(xSyncGetPriorityReq);
+    xSyncGetPriorityReply rep;
+    ClientPtr priorityclient;
+    int rc;
+
+    REQUEST_SIZE_MATCH(xSyncGetPriorityReq);
+
+    if (stuff->id == None)
+	priorityclient = client;
+    else {
+	rc = dixLookupClient(&priorityclient, stuff->id, client,
+			     DixGetAttrAccess);
+	if (rc != Success)
+	    return rc;
+    }
+
+    rep.type = X_Reply;
+    rep.length = 0;
+    rep.sequenceNumber = client->sequence;
+    rep.priority = priorityclient->priority;
+
+    if (client->swapped)
+    {
+	char n;
+	swaps(&rep.sequenceNumber, n);
+	swapl(&rep.priority, n);
+    }
+
+    WriteToClient(client, sizeof(xSyncGetPriorityReply), (char *) &rep);
+
+    return Success;
+}
+
+/*
+ * ** Create a new counter
+ */
+static int
+ProcSyncCreateCounter(ClientPtr client)
+{
+    REQUEST(xSyncCreateCounterReq);
+    CARD64          initial;
+
+    REQUEST_SIZE_MATCH(xSyncCreateCounterReq);
+
+    LEGAL_NEW_RESOURCE(stuff->cid, client);
+
+    XSyncIntsToValue(&initial, stuff->initial_value_lo, stuff->initial_value_hi);
+    if (!SyncCreateCounter(client, stuff->cid, initial))
+	return BadAlloc;
+
+    return Success;
+}
+
+/*
+ * ** Set Counter value
+ */
+static int
+ProcSyncSetCounter(ClientPtr client)
+{
+    REQUEST(xSyncSetCounterReq);
+    SyncCounter    *pCounter;
+    CARD64	   newvalue;
+    int	rc;
+
+    REQUEST_SIZE_MATCH(xSyncSetCounterReq);
+
+    rc = dixLookupResourceByType((pointer *)&pCounter, stuff->cid, RTCounter,
+				 client, DixWriteAccess);
+    if (rc != Success)
+	return (rc == BadValue) ? SyncErrorBase + XSyncBadCounter : rc;
+
+    if (IsSystemCounter(pCounter))
+    {
+	client->errorValue = stuff->cid;
+	return BadAccess;
+    }
+
+    XSyncIntsToValue(&newvalue, stuff->value_lo, stuff->value_hi);
+    SyncChangeCounter(pCounter, newvalue);
+    return Success;
+}
+
+/*
+ * ** Change Counter value
+ */
+static int
+ProcSyncChangeCounter(ClientPtr client)
+{
+    REQUEST(xSyncChangeCounterReq);
+    SyncCounter    *pCounter;
+    CARD64          newvalue;
+    Bool	    overflow;
+    int	rc;
+
+    REQUEST_SIZE_MATCH(xSyncChangeCounterReq);
+
+    rc = dixLookupResourceByType((pointer *)&pCounter, stuff->cid, RTCounter,
+				 client, DixWriteAccess);
+    if (rc != Success)
+	return (rc == BadValue) ? SyncErrorBase + XSyncBadCounter : rc;
+
+    if (IsSystemCounter(pCounter))
+    {
+	client->errorValue = stuff->cid;
+	return BadAccess;
+    }
+
+    XSyncIntsToValue(&newvalue, stuff->value_lo, stuff->value_hi);
+    XSyncValueAdd(&newvalue, pCounter->value, newvalue, &overflow);
+    if (overflow)
+    {
+	/* XXX 64 bit value can't fit in 32 bits; do the best we can */
+	client->errorValue = stuff->value_hi;
+	return BadValue;
+    }
+    SyncChangeCounter(pCounter, newvalue);
+    return Success;
+}
+
+/*
+ * ** Destroy a counter
+ */
+static int
+ProcSyncDestroyCounter(ClientPtr client)
+{
+    REQUEST(xSyncDestroyCounterReq);
+    SyncCounter    *pCounter;
+    int rc;
+
+    REQUEST_SIZE_MATCH(xSyncDestroyCounterReq);
+
+    rc = dixLookupResourceByType((pointer *)&pCounter, stuff->counter, RTCounter,
+				 client, DixDestroyAccess);
+    if (rc != Success)
+	return (rc == BadValue) ? SyncErrorBase + XSyncBadCounter : rc;
+
+    if (IsSystemCounter(pCounter))
+    {
+	client->errorValue = stuff->counter;
+	return BadAccess;
+    }
+    FreeResource(pCounter->id, RT_NONE);
+    return Success;
+}
+
+
+/*
+ * ** Await
+ */
+static int
+ProcSyncAwait(ClientPtr client)
+{
+    REQUEST(xSyncAwaitReq);
+    int             len, items;
+    int             i;
+    xSyncWaitCondition *pProtocolWaitConds;
+    SyncAwaitUnion *pAwaitUnion;
+    SyncAwait	   *pAwait;
+    int		   status;
+
+    REQUEST_AT_LEAST_SIZE(xSyncAwaitReq);
+
+    len = client->req_len << 2;
+    len -= sz_xSyncAwaitReq;
+    items = len / sz_xSyncWaitCondition;
+
+    if (items * sz_xSyncWaitCondition != len)
+    {
+	return BadLength;
+    }
+    if (items == 0)
+    {
+	client->errorValue = items; /* XXX protocol change */
+	return BadValue;
+    }
+
+    pProtocolWaitConds = (xSyncWaitCondition *) & stuff[1];
+
+    /*  all the memory for the entire await list is allocated
+     *  here in one chunk
+     */
+    pAwaitUnion = malloc((items+1) * sizeof(SyncAwaitUnion));
+    if (!pAwaitUnion)
+	return BadAlloc;
+
+    /* first item is the header, remainder are real wait conditions */
+
+    pAwaitUnion->header.delete_id = FakeClientID(client->index);
+    if (!AddResource(pAwaitUnion->header.delete_id, RTAwait, pAwaitUnion))
+    {
+	free(pAwaitUnion);
+	return BadAlloc;
+    }
+
+    /* don't need to do any more memory allocation for this request! */
+
+    pAwaitUnion->header.client = client;
+    pAwaitUnion->header.num_waitconditions = 0;
+
+    pAwait = &(pAwaitUnion+1)->await; /* skip over header */
+    for (i = 0; i < items; i++, pProtocolWaitConds++, pAwait++)
+    {
+	if (pProtocolWaitConds->counter == None) /* XXX protocol change */
+	{
+	    /*  this should take care of removing any triggers created by
+	     *  this request that have already been registered on counters
+	     */
+	    FreeResource(pAwaitUnion->header.delete_id, RT_NONE);
+	    client->errorValue = pProtocolWaitConds->counter;
+	    return SyncErrorBase + XSyncBadCounter;
+	}
+
+	/* sanity checks are in SyncInitTrigger */
+	pAwait->trigger.pCounter = NULL;
+	pAwait->trigger.value_type = pProtocolWaitConds->value_type;
+	XSyncIntsToValue(&pAwait->trigger.wait_value,
+			 pProtocolWaitConds->wait_value_lo,
+			 pProtocolWaitConds->wait_value_hi);
+	pAwait->trigger.test_type = pProtocolWaitConds->test_type;
+
+	status = SyncInitTrigger(client, &pAwait->trigger,
+			 pProtocolWaitConds->counter, XSyncCAAllTrigger);
+	if (status != Success)
+	{
+	    /*  this should take care of removing any triggers created by
+	     *  this request that have already been registered on counters
+	     */
+	    FreeResource(pAwaitUnion->header.delete_id, RT_NONE);
+	    return status;
+	}
+	/* this is not a mistake -- same function works for both cases */
+	pAwait->trigger.TriggerFired = SyncAwaitTriggerFired;
+	pAwait->trigger.CounterDestroyed = SyncAwaitTriggerFired;
+	XSyncIntsToValue(&pAwait->event_threshold,
+			 pProtocolWaitConds->event_threshold_lo,
+			 pProtocolWaitConds->event_threshold_hi);
+	pAwait->pHeader = &pAwaitUnion->header;
+	pAwaitUnion->header.num_waitconditions++;
+    }
+
+    IgnoreClient(client);
+
+    /* see if any of the triggers are already true */
+
+    pAwait = &(pAwaitUnion+1)->await; /* skip over header */
+    for (i = 0; i < items; i++, pAwait++)
+    {
+	/*  don't have to worry about NULL counters because the request
+	 *  errors before we get here out if they occur
+	 */
+	if ((*pAwait->trigger.CheckTrigger)(&pAwait->trigger,
+					    pAwait->trigger.pCounter->value))
+	{
+	    (*pAwait->trigger.TriggerFired)(&pAwait->trigger);
+	    break; /* once is enough */
+	}
+    }
+    return Success;
+}
+
+
+/*
+ * ** Query a counter
+ */
+static int
+ProcSyncQueryCounter(ClientPtr client)
+{
+    REQUEST(xSyncQueryCounterReq);
+    xSyncQueryCounterReply rep;
+    SyncCounter    *pCounter;
+    int rc;
+
+    REQUEST_SIZE_MATCH(xSyncQueryCounterReq);
+
+    rc = dixLookupResourceByType((pointer *)&pCounter, stuff->counter,
+				 RTCounter, client, DixReadAccess);
+    if (rc != Success)
+	return (rc == BadValue) ? SyncErrorBase + XSyncBadCounter : rc;
+
+    rep.type = X_Reply;
+    rep.length = 0;
+    rep.sequenceNumber = client->sequence;
+
+    /* if system counter, ask it what the current value is */
+
+    if (IsSystemCounter(pCounter))
+    {
+	(*pCounter->pSysCounterInfo->QueryValue) ((pointer) pCounter,
+						  &pCounter->value);
+    }
+
+    rep.value_hi = XSyncValueHigh32(pCounter->value);
+    rep.value_lo = XSyncValueLow32(pCounter->value);
+    if (client->swapped)
+    {
+	char n;
+	swaps(&rep.sequenceNumber, n);
+	swapl(&rep.length, n);
+	swapl(&rep.value_hi, n);
+	swapl(&rep.value_lo, n);
+    }
+    WriteToClient(client, sizeof(xSyncQueryCounterReply), (char *) &rep);
+    return Success;
+}
+
+
+/*
+ * ** Create Alarm
+ */
+static int
+ProcSyncCreateAlarm(ClientPtr client)
+{
+    REQUEST(xSyncCreateAlarmReq);
+    SyncAlarm      *pAlarm;
+    int             status;
+    unsigned long   len, vmask;
+    SyncTrigger	    *pTrigger;
+
+    REQUEST_AT_LEAST_SIZE(xSyncCreateAlarmReq);
+
+    LEGAL_NEW_RESOURCE(stuff->id, client);
+
+    vmask = stuff->valueMask;
+    len = client->req_len - bytes_to_int32(sizeof(xSyncCreateAlarmReq));
+    /* the "extra" call to Ones accounts for the presence of 64 bit values */
+    if (len != (Ones(vmask) + Ones(vmask & (XSyncCAValue|XSyncCADelta))))
+	return BadLength;
+
+    if (!(pAlarm = malloc(sizeof(SyncAlarm))))
+    {
+	return BadAlloc;
+    }
+
+    /* set up defaults */
+
+    pTrigger = &pAlarm->trigger;
+    pTrigger->pCounter = NULL;
+    pTrigger->value_type = XSyncAbsolute;
+    XSyncIntToValue(&pTrigger->wait_value, 0L);
+    pTrigger->test_type = XSyncPositiveComparison;
+    pTrigger->TriggerFired = SyncAlarmTriggerFired;
+    pTrigger->CounterDestroyed = SyncAlarmCounterDestroyed;
+    status = SyncInitTrigger(client, pTrigger, None, XSyncCAAllTrigger);
+    if (status != Success)
+    {
+	free(pAlarm);
+	return status;
+    }
+
+    pAlarm->client = client;
+    pAlarm->alarm_id = stuff->id;
+    XSyncIntToValue(&pAlarm->delta, 1L);
+    pAlarm->events = TRUE;
+    pAlarm->state = XSyncAlarmInactive;
+    pAlarm->pEventClients = NULL;
+    status = SyncChangeAlarmAttributes(client, pAlarm, vmask,
+				       (CARD32 *)&stuff[1]);
+    if (status != Success)
+    {
+	free(pAlarm);
+	return status;
+    }
+
+    if (!AddResource(stuff->id, RTAlarm, pAlarm))
+    {
+	free(pAlarm);
+	return BadAlloc;
+    }
+
+    /*  see if alarm already triggered.  NULL counter will not trigger
+     *  in CreateAlarm and sets alarm state to Inactive.
+     */
+
+    if (!pTrigger->pCounter)
+    {
+	pAlarm->state = XSyncAlarmInactive; /* XXX protocol change */
+    }
+    else if ((*pTrigger->CheckTrigger)(pTrigger, pTrigger->pCounter->value))
+    {
+	(*pTrigger->TriggerFired)(pTrigger);
+    }
+
+    return Success;
+}
+
+/*
+ * ** Change Alarm
+ */
+static int
+ProcSyncChangeAlarm(ClientPtr client)
+{
+    REQUEST(xSyncChangeAlarmReq);
+    SyncAlarm   *pAlarm;
+    long        vmask;
+    int         len, status;
+
+    REQUEST_AT_LEAST_SIZE(xSyncChangeAlarmReq);
+
+    status = dixLookupResourceByType((pointer *)&pAlarm, stuff->alarm, RTAlarm,
+				     client, DixWriteAccess);
+    if (status != Success)
+	return (status == BadValue) ? SyncErrorBase + XSyncBadAlarm : status;
+
+    vmask = stuff->valueMask;
+    len = client->req_len - bytes_to_int32(sizeof(xSyncChangeAlarmReq));
+    /* the "extra" call to Ones accounts for the presence of 64 bit values */
+    if (len != (Ones(vmask) + Ones(vmask & (XSyncCAValue|XSyncCADelta))))
+	return BadLength;
+
+    if ((status = SyncChangeAlarmAttributes(client, pAlarm, vmask,
+					    (CARD32 *)&stuff[1])) != Success)
+	return status;
+
+    /*  see if alarm already triggered.  NULL counter WILL trigger
+     *  in ChangeAlarm.
+     */
+
+    if (!pAlarm->trigger.pCounter ||
+	(*pAlarm->trigger.CheckTrigger)(&pAlarm->trigger,
+					pAlarm->trigger.pCounter->value))
+    {
+	(*pAlarm->trigger.TriggerFired)(&pAlarm->trigger);
+    }
+    return Success;
+}
+
+static int
+ProcSyncQueryAlarm(ClientPtr client)
+{
+    REQUEST(xSyncQueryAlarmReq);
+    SyncAlarm      *pAlarm;
+    xSyncQueryAlarmReply rep;
+    SyncTrigger    *pTrigger;
+    int rc;
+
+    REQUEST_SIZE_MATCH(xSyncQueryAlarmReq);
+
+    rc = dixLookupResourceByType((pointer *)&pAlarm, stuff->alarm, RTAlarm,
+				 client, DixReadAccess);
+    if (rc != Success)
+	return (rc == BadValue) ? SyncErrorBase + XSyncBadAlarm : rc;
+
+    rep.type = X_Reply;
+    rep.length = bytes_to_int32(sizeof(xSyncQueryAlarmReply) - sizeof(xGenericReply));
+    rep.sequenceNumber = client->sequence;
+
+    pTrigger = &pAlarm->trigger;
+    rep.counter = (pTrigger->pCounter) ? pTrigger->pCounter->id : None;
+
+#if 0 /* XXX unclear what to do, depends on whether relative value-types
+       * are "consumed" immediately and are considered absolute from then
+       * on.
+       */
+    rep.value_type = pTrigger->value_type;
+    rep.wait_value_hi = XSyncValueHigh32(pTrigger->wait_value);
+    rep.wait_value_lo = XSyncValueLow32(pTrigger->wait_value);
+#else
+    rep.value_type = XSyncAbsolute;
+    rep.wait_value_hi = XSyncValueHigh32(pTrigger->test_value);
+    rep.wait_value_lo = XSyncValueLow32(pTrigger->test_value);
+#endif
+
+    rep.test_type = pTrigger->test_type;
+    rep.delta_hi = XSyncValueHigh32(pAlarm->delta);
+    rep.delta_lo = XSyncValueLow32(pAlarm->delta);
+    rep.events = pAlarm->events;
+    rep.state = pAlarm->state;
+
+    if (client->swapped)
+    {
+	char n;
+	swaps(&rep.sequenceNumber, n);
+	swapl(&rep.length, n);
+	swapl(&rep.counter, n);
+	swapl(&rep.wait_value_hi, n);
+	swapl(&rep.wait_value_lo, n);
+	swapl(&rep.test_type, n);
+	swapl(&rep.delta_hi, n);
+	swapl(&rep.delta_lo, n);
+    }
+
+    WriteToClient(client, sizeof(xSyncQueryAlarmReply), (char *) &rep);
+    return Success;
+}
+
+static int
+ProcSyncDestroyAlarm(ClientPtr client)
+{
+    SyncAlarm *pAlarm;
+    int rc;
+    REQUEST(xSyncDestroyAlarmReq);
+
+    REQUEST_SIZE_MATCH(xSyncDestroyAlarmReq);
+
+    rc = dixLookupResourceByType((pointer *)&pAlarm, stuff->alarm, RTAlarm,
+				 client, DixDestroyAccess);
+    if (rc != Success)
+	return (rc == BadValue) ? SyncErrorBase + XSyncBadAlarm : rc;
+
+    FreeResource(stuff->alarm, RT_NONE);
+    return Success;
+}
+
+/*
+ * ** Given an extension request, call the appropriate request procedure
+ */
+static int
+ProcSyncDispatch(ClientPtr client)
+{
+    REQUEST(xReq);
+
+    switch (stuff->data)
+    {
+      case X_SyncInitialize:
+	return ProcSyncInitialize(client);
+      case X_SyncListSystemCounters:
+	return ProcSyncListSystemCounters(client);
+      case X_SyncCreateCounter:
+	return ProcSyncCreateCounter(client);
+      case X_SyncSetCounter:
+	return ProcSyncSetCounter(client);
+      case X_SyncChangeCounter:
+	return ProcSyncChangeCounter(client);
+      case X_SyncQueryCounter:
+	return ProcSyncQueryCounter(client);
+      case X_SyncDestroyCounter:
+	return ProcSyncDestroyCounter(client);
+      case X_SyncAwait:
+	return ProcSyncAwait(client);
+      case X_SyncCreateAlarm:
+	return ProcSyncCreateAlarm(client);
+      case X_SyncChangeAlarm:
+	return ProcSyncChangeAlarm(client);
+      case X_SyncQueryAlarm:
+	return ProcSyncQueryAlarm(client);
+      case X_SyncDestroyAlarm:
+	return ProcSyncDestroyAlarm(client);
+      case X_SyncSetPriority:
+	return ProcSyncSetPriority(client);
+      case X_SyncGetPriority:
+	return ProcSyncGetPriority(client);
+      default:
+	return BadRequest;
+    }
+}
+
+/*
+ * Boring Swapping stuff ...
+ */
+
+static int
+SProcSyncInitialize(ClientPtr client)
+{
+    REQUEST(xSyncInitializeReq);
+    char   n;
+
+    swaps(&stuff->length, n);
+    REQUEST_SIZE_MATCH (xSyncInitializeReq);
+
+    return ProcSyncInitialize(client);
+}
+
+static int
+SProcSyncListSystemCounters(ClientPtr client)
+{
+    REQUEST(xSyncListSystemCountersReq);
+    char   n;
+
+    swaps(&stuff->length, n);
+    REQUEST_SIZE_MATCH (xSyncListSystemCountersReq);
+
+    return ProcSyncListSystemCounters(client);
+}
+
+static int
+SProcSyncCreateCounter(ClientPtr client)
+{
+    REQUEST(xSyncCreateCounterReq);
+    char   n;
+
+    swaps(&stuff->length, n);
+    REQUEST_SIZE_MATCH (xSyncCreateCounterReq);
+    swapl(&stuff->cid, n);
+    swapl(&stuff->initial_value_lo, n);
+    swapl(&stuff->initial_value_hi, n);
+
+    return ProcSyncCreateCounter(client);
+}
+
+static int
+SProcSyncSetCounter(ClientPtr client)
+{
+    REQUEST(xSyncSetCounterReq);
+    char   n;
+
+    swaps(&stuff->length, n);
+    REQUEST_SIZE_MATCH (xSyncSetCounterReq);
+    swapl(&stuff->cid, n);
+    swapl(&stuff->value_lo, n);
+    swapl(&stuff->value_hi, n);
+
+    return ProcSyncSetCounter(client);
+}
+
+static int
+SProcSyncChangeCounter(ClientPtr client)
+{
+    REQUEST(xSyncChangeCounterReq);
+    char   n;
+
+    swaps(&stuff->length, n);
+    REQUEST_SIZE_MATCH (xSyncChangeCounterReq);
+    swapl(&stuff->cid, n);
+    swapl(&stuff->value_lo, n);
+    swapl(&stuff->value_hi, n);
+
+    return ProcSyncChangeCounter(client);
+}
+
+static int
+SProcSyncQueryCounter(ClientPtr client)
+{
+    REQUEST(xSyncQueryCounterReq);
+    char   n;
+
+    swaps(&stuff->length, n);
+    REQUEST_SIZE_MATCH (xSyncQueryCounterReq);
+    swapl(&stuff->counter, n);
+
+    return ProcSyncQueryCounter(client);
+}
+
+static int
+SProcSyncDestroyCounter(ClientPtr client)
+{
+    REQUEST(xSyncDestroyCounterReq);
+    char   n;
+
+    swaps(&stuff->length, n);
+    REQUEST_SIZE_MATCH (xSyncDestroyCounterReq);
+    swapl(&stuff->counter, n);
+
+    return ProcSyncDestroyCounter(client);
+}
+
+static int
+SProcSyncAwait(ClientPtr client)
+{
+    REQUEST(xSyncAwaitReq);
+    char   n;
+
+    swaps(&stuff->length, n);
+    REQUEST_AT_LEAST_SIZE(xSyncAwaitReq);
+    SwapRestL(stuff);
+
+    return ProcSyncAwait(client);
+}
+
+static int
+SProcSyncCreateAlarm(ClientPtr client)
+{
+    REQUEST(xSyncCreateAlarmReq);
+    char   n;
+
+    swaps(&stuff->length, n);
+    REQUEST_AT_LEAST_SIZE(xSyncCreateAlarmReq);
+    swapl(&stuff->id, n);
+    swapl(&stuff->valueMask, n);
+    SwapRestL(stuff);
+
+    return ProcSyncCreateAlarm(client);
+}
+
+static int
+SProcSyncChangeAlarm(ClientPtr client)
+{
+    REQUEST(xSyncChangeAlarmReq);
+    char   n;
+
+    swaps(&stuff->length, n);
+    REQUEST_AT_LEAST_SIZE(xSyncChangeAlarmReq);
+    swapl(&stuff->alarm, n);
+    swapl(&stuff->valueMask, n);
+    SwapRestL(stuff);
+    return ProcSyncChangeAlarm(client);
+}
+
+static int
+SProcSyncQueryAlarm(ClientPtr client)
+{
+    REQUEST(xSyncQueryAlarmReq);
+    char   n;
+
+    swaps(&stuff->length, n);
+    REQUEST_SIZE_MATCH (xSyncQueryAlarmReq);
+    swapl(&stuff->alarm, n);
+
+    return ProcSyncQueryAlarm(client);
+}
+
+static int
+SProcSyncDestroyAlarm(ClientPtr client)
+{
+    REQUEST(xSyncDestroyAlarmReq);
+    char   n;
+
+    swaps(&stuff->length, n);
+    REQUEST_SIZE_MATCH (xSyncDestroyAlarmReq);
+    swapl(&stuff->alarm, n);
+
+    return ProcSyncDestroyAlarm(client);
+}
+
+static int
+SProcSyncSetPriority(ClientPtr client)
+{
+    REQUEST(xSyncSetPriorityReq);
+    char   n;
+
+    swaps(&stuff->length, n);
+    REQUEST_SIZE_MATCH (xSyncSetPriorityReq);
+    swapl(&stuff->id, n);
+    swapl(&stuff->priority, n);
+
+    return ProcSyncSetPriority(client);
+}
+
+static int
+SProcSyncGetPriority(ClientPtr client)
+{
+    REQUEST(xSyncGetPriorityReq);
+    char   n;
+
+    swaps(&stuff->length, n);
+    REQUEST_SIZE_MATCH (xSyncGetPriorityReq);
+    swapl(&stuff->id, n);
+
+    return ProcSyncGetPriority(client);
+}
+
+
+static int
+SProcSyncDispatch(ClientPtr client)
+{
+    REQUEST(xReq);
+
+    switch (stuff->data)
+    {
+      case X_SyncInitialize:
+	return SProcSyncInitialize(client);
+      case X_SyncListSystemCounters:
+	return SProcSyncListSystemCounters(client);
+      case X_SyncCreateCounter:
+	return SProcSyncCreateCounter(client);
+      case X_SyncSetCounter:
+	return SProcSyncSetCounter(client);
+      case X_SyncChangeCounter:
+	return SProcSyncChangeCounter(client);
+      case X_SyncQueryCounter:
+	return SProcSyncQueryCounter(client);
+      case X_SyncDestroyCounter:
+	return SProcSyncDestroyCounter(client);
+      case X_SyncAwait:
+	return SProcSyncAwait(client);
+      case X_SyncCreateAlarm:
+	return SProcSyncCreateAlarm(client);
+      case X_SyncChangeAlarm:
+	return SProcSyncChangeAlarm(client);
+      case X_SyncQueryAlarm:
+	return SProcSyncQueryAlarm(client);
+      case X_SyncDestroyAlarm:
+	return SProcSyncDestroyAlarm(client);
+      case X_SyncSetPriority:
+	return SProcSyncSetPriority(client);
+      case X_SyncGetPriority:
+	return SProcSyncGetPriority(client);
+      default:
+	return BadRequest;
+    }
+}
+
+/*
+ * Event Swapping
+ */
+
+static void
+SCounterNotifyEvent(xSyncCounterNotifyEvent *from, xSyncCounterNotifyEvent *to)
+{
+    to->type = from->type;
+    to->kind = from->kind;
+    cpswaps(from->sequenceNumber, to->sequenceNumber);
+    cpswapl(from->counter, to->counter);
+    cpswapl(from->wait_value_lo, to->wait_value_lo);
+    cpswapl(from->wait_value_hi, to->wait_value_hi);
+    cpswapl(from->counter_value_lo, to->counter_value_lo);
+    cpswapl(from->counter_value_hi, to->counter_value_hi);
+    cpswapl(from->time, to->time);
+    cpswaps(from->count, to->count);
+    to->destroyed = from->destroyed;
+}
+
+
+static void
+SAlarmNotifyEvent(xSyncAlarmNotifyEvent *from, xSyncAlarmNotifyEvent *to)
+{
+    to->type = from->type;
+    to->kind = from->kind;
+    cpswaps(from->sequenceNumber, to->sequenceNumber);
+    cpswapl(from->alarm, to->alarm);
+    cpswapl(from->counter_value_lo, to->counter_value_lo);
+    cpswapl(from->counter_value_hi, to->counter_value_hi);
+    cpswapl(from->alarm_value_lo, to->alarm_value_lo);
+    cpswapl(from->alarm_value_hi, to->alarm_value_hi);
+    cpswapl(from->time, to->time);
+    to->state = from->state;
+}
+
+/*
+ * ** Close everything down. ** This is fairly simple for now.
+ */
+/* ARGSUSED */
+static void
+SyncResetProc(ExtensionEntry *extEntry)
+{
+    free(SysCounterList);
+    SysCounterList = NULL;
+    RTCounter = 0;
+}
+
+
+/*
+ * ** Initialise the extension.
+ */
+void
+SyncExtensionInit(void)
+{
+    ExtensionEntry *extEntry;
+
+    if (RTCounter == 0)
+    {
+	RTCounter = CreateNewResourceType(FreeCounter, "SyncCounter");
+    }
+    RTAlarm = CreateNewResourceType(FreeAlarm, "SyncAlarm");
+    RTAwait = CreateNewResourceType(FreeAwait, "SyncAwait");
+    if (RTAwait)
+	RTAwait |= RC_NEVERRETAIN;
+    RTAlarmClient = CreateNewResourceType(FreeAlarmClient, "SyncAlarmClient");
+    if (RTAlarmClient)
+	RTAlarmClient |= RC_NEVERRETAIN;
+
+    if (RTCounter == 0 || RTAwait == 0 || RTAlarm == 0 ||
+	RTAlarmClient == 0 ||
+	(extEntry = AddExtension(SYNC_NAME,
+				 XSyncNumberEvents, XSyncNumberErrors,
+				 ProcSyncDispatch, SProcSyncDispatch,
+				 SyncResetProc,
+				 StandardMinorOpcode)) == NULL)
+    {
+	ErrorF("Sync Extension %d.%d failed to Initialise\n",
+		SYNC_MAJOR_VERSION, SYNC_MINOR_VERSION);
+	return;
+    }
+
+    SyncEventBase = extEntry->eventBase;
+    SyncErrorBase = extEntry->errorBase;
+    EventSwapVector[SyncEventBase + XSyncCounterNotify] = (EventSwapPtr) SCounterNotifyEvent;
+    EventSwapVector[SyncEventBase + XSyncAlarmNotify] = (EventSwapPtr) SAlarmNotifyEvent;
+
+    /*
+     * Although SERVERTIME is implemented by the OS layer, we initialise it
+     * here because doing it in OsInit() is too early. The resource database
+     * is not initialised when OsInit() is called. This is just about OK
+     * because there is always a servertime counter.
+     */
+    SyncInitServerTime();
+    SyncInitIdleTime();
+
+#ifdef DEBUG
+    fprintf(stderr, "Sync Extension %d.%d\n",
+	    SYNC_MAJOR_VERSION, SYNC_MINOR_VERSION);
+#endif
+}
+
+
+/*
+ * ***** SERVERTIME implementation - should go in its own file in OS directory?
+ */
+
+
+
+static pointer ServertimeCounter;
+static XSyncValue Now;
+static XSyncValue *pnext_time;
+
+#define GetTime()\
+{\
+    unsigned long millis = GetTimeInMillis();\
+    unsigned long maxis = XSyncValueHigh32(Now);\
+    if (millis < XSyncValueLow32(Now)) maxis++;\
+    XSyncIntsToValue(&Now, millis, maxis);\
+}
+
+/*
+*** Server Block Handler
+*** code inspired by multibuffer extension (now deprecated)
+ */
+/*ARGSUSED*/
+static void
+ServertimeBlockHandler(void *env, struct timeval **wt, void *LastSelectMask)
+{
+    XSyncValue delay;
+    unsigned long timeout;
+
+    if (pnext_time)
+    {
+        GetTime();
+
+        if (XSyncValueGreaterOrEqual(Now, *pnext_time))
+	{
+            timeout = 0;
+        }
+	else
+	{
+	    Bool overflow;
+            XSyncValueSubtract(&delay, *pnext_time, Now, &overflow);
+	    (void)overflow;
+            timeout = XSyncValueLow32(delay);
+        }
+        AdjustWaitForDelay(wt, timeout); /* os/utils.c */
+    }
+}
+
+/*
+*** Wakeup Handler
+ */
+/*ARGSUSED*/
+static void
+ServertimeWakeupHandler(void *env, int rc, void *LastSelectMask)
+{
+    if (pnext_time)
+    {
+        GetTime();
+
+        if (XSyncValueGreaterOrEqual(Now, *pnext_time))
+	{
+            SyncChangeCounter(ServertimeCounter, Now);
+        }
+    }
+}
+
+static void
+ServertimeQueryValue(void *pCounter, CARD64 *pValue_return)
+{
+    GetTime();
+    *pValue_return = Now;
+}
+
+static void
+ServertimeBracketValues(void *pCounter, CARD64 *pbracket_less,
+			CARD64 *pbracket_greater)
+{
+    if (!pnext_time && pbracket_greater)
+    {
+	RegisterBlockAndWakeupHandlers(ServertimeBlockHandler,
+				       ServertimeWakeupHandler,
+				       NULL);
+    }
+    else if (pnext_time && !pbracket_greater)
+    {
+	RemoveBlockAndWakeupHandlers(ServertimeBlockHandler,
+				     ServertimeWakeupHandler,
+				     NULL);
+    }
+    pnext_time = pbracket_greater;
+}
+
+static void
+SyncInitServerTime(void)
+{
+    CARD64 resolution;
+
+    XSyncIntsToValue(&Now, GetTimeInMillis(), 0);
+    XSyncIntToValue(&resolution, 4);
+    ServertimeCounter = SyncCreateSystemCounter("SERVERTIME", Now, resolution,
+			    XSyncCounterNeverDecreases,
+			    ServertimeQueryValue, ServertimeBracketValues);
+    pnext_time = NULL;
+}
+
+
+
+/*
+ * IDLETIME implementation
+ */
+
+static SyncCounter *IdleTimeCounter;
+static XSyncValue *pIdleTimeValueLess;
+static XSyncValue *pIdleTimeValueGreater;
+
+static void
+IdleTimeQueryValue (pointer pCounter, CARD64 *pValue_return)
+{
+    CARD32 idle = GetTimeInMillis() - lastDeviceEventTime.milliseconds;
+    XSyncIntsToValue (pValue_return, idle, 0);
+}
+
+static void
+IdleTimeBlockHandler(pointer env, struct timeval **wt, pointer LastSelectMask)
+{
+    XSyncValue idle, old_idle;
+    SyncTriggerList *list = IdleTimeCounter->pTriglist;
+    SyncTrigger *trig;
+
+    if (!pIdleTimeValueLess && !pIdleTimeValueGreater)
+	return;
+
+    old_idle = IdleTimeCounter->value;
+    IdleTimeQueryValue (NULL, &idle);
+    IdleTimeCounter->value = idle; /* push, so CheckTrigger works */
+
+    if (pIdleTimeValueLess &&
+        XSyncValueLessOrEqual (idle, *pIdleTimeValueLess))
+    {
+	/*
+	 * We've been idle for less than the threshold value, and someone
+	 * wants to know about that, but now we need to know whether they
+	 * want level or edge trigger.  Check the trigger list against the
+	 * current idle time, and if any succeed, bomb out of select()
+	 * immediately so we can reschedule.
+	 */
+
+	for (list = IdleTimeCounter->pTriglist; list; list = list->next) {
+	    trig = list->pTrigger;
+	    if (trig->CheckTrigger(trig, old_idle)) {
+		AdjustWaitForDelay(wt, 0);
+		break;
+	    }
+	}
+    }
+    else if (pIdleTimeValueGreater)
+    {
+	/*
+	 * There's a threshold in the positive direction.  If we've been
+	 * idle less than it, schedule a wakeup for sometime in the future.
+	 * If we've been idle more than it, and someone wants to know about
+	 * that level-triggered, schedule an immediate wakeup.
+	 */
+	unsigned long timeout = -1;
+
+	if (XSyncValueLessThan (idle, *pIdleTimeValueGreater)) {
+	    XSyncValue value;
+	    Bool overflow;
+
+	    XSyncValueSubtract (&value, *pIdleTimeValueGreater,
+	                        idle, &overflow);
+	    timeout = min(timeout, XSyncValueLow32 (value));
+	} else {
+	    for (list = IdleTimeCounter->pTriglist; list; list = list->next) {
+		trig = list->pTrigger;
+		if (trig->CheckTrigger(trig, old_idle)) {
+		    timeout = min(timeout, 0);
+		    break;
+		}
+	    }
+	}
+
+	AdjustWaitForDelay (wt, timeout);
+    }
+
+    IdleTimeCounter->value = old_idle; /* pop */
+}
+
+static void
+IdleTimeWakeupHandler (pointer env, int rc, pointer LastSelectMask)
+{
+    XSyncValue idle;
+
+    if (!pIdleTimeValueLess && !pIdleTimeValueGreater)
+	return;
+
+    IdleTimeQueryValue (NULL, &idle);
+
+    if ((pIdleTimeValueGreater &&
+         XSyncValueGreaterOrEqual (idle, *pIdleTimeValueGreater)) ||
+        (pIdleTimeValueLess &&
+	 XSyncValueLessOrEqual (idle, *pIdleTimeValueLess)))
+    {
+	SyncChangeCounter (IdleTimeCounter, idle);
+    }
+}
+
+static void
+IdleTimeBracketValues (pointer pCounter, CARD64 *pbracket_less,
+                       CARD64 *pbracket_greater)
+{
+    Bool registered = (pIdleTimeValueLess || pIdleTimeValueGreater);
+
+    if (registered && !pbracket_less && !pbracket_greater)
+    {
+	RemoveBlockAndWakeupHandlers(IdleTimeBlockHandler,
+	                             IdleTimeWakeupHandler,
+	                             NULL);
+    }
+    else if (!registered && (pbracket_less || pbracket_greater))
+    {
+	RegisterBlockAndWakeupHandlers(IdleTimeBlockHandler,
+	                               IdleTimeWakeupHandler,
+	                               NULL);
+    }
+
+    pIdleTimeValueGreater = pbracket_greater;
+    pIdleTimeValueLess    = pbracket_less;
+}
+
+static void
+SyncInitIdleTime (void)
+{
+    CARD64 resolution;
+    XSyncValue idle;
+
+    IdleTimeQueryValue (NULL, &idle);
+    XSyncIntToValue (&resolution, 4);
+
+    IdleTimeCounter = SyncCreateSystemCounter ("IDLETIME", idle, resolution,
+                                               XSyncCounterUnrestricted,
+                                               IdleTimeQueryValue,
+                                               IdleTimeBracketValues);
+
+    pIdleTimeValueLess = pIdleTimeValueGreater = NULL;
+}