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+/* $Xorg: sync.c,v 1.4 2001/02/09 02:04:33 xorgcvs Exp $ */
+/*
+
+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.
+
+*/
+/* $XFree86: xc/programs/Xserver/Xext/sync.c,v 3.13 2003/09/02 18:19:01 tsi Exp $ */
+
+#define NEED_REPLIES
+#define NEED_EVENTS
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#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"
+#define _SYNC_SERVER
+#include <X11/extensions/sync.h>
+#include <X11/extensions/syncstr.h>
+
+#ifdef EXTMODULE
+#include "xf86_ansic.h"
+#else
+#include <stdio.h>
+#if !defined(WIN32) && !defined(Lynx)
+#include <sys/time.h>
+#endif
+#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 int
+FreeAlarm(
+ pointer /* addr */,
+ XID /* id */
+);
+
+static int
+FreeAlarmClient(
+ pointer /* value */,
+ XID /* id */
+);
+
+static int
+FreeAwait(
+ pointer /* addr */,
+ XID /* id */
+);
+
+static void
+ServertimeBracketValues(
+ pointer /* pCounter */,
+ CARD64 * /* pbracket_less */,
+ CARD64 * /* pbracket_greater */
+);
+
+static void
+ServertimeQueryValue(
+ pointer /* pCounter */,
+ CARD64 * /* pValue_return */
+);
+
+static void
+ServertimeWakeupHandler(
+ pointer /* env */,
+ int /* rc */,
+ pointer /* LastSelectMask */
+);
+
+static int
+SyncInitTrigger(
+ ClientPtr /* client */,
+ SyncTrigger * /* pTrigger */,
+ XSyncCounter /* counter */,
+ Mask /* changes */
+);
+
+static void
+SAlarmNotifyEvent(
+ xSyncAlarmNotifyEvent * /* from */,
+ xSyncAlarmNotifyEvent * /* to */
+);
+
+static void
+SCounterNotifyEvent(
+ xSyncCounterNotifyEvent * /* from */,
+ xSyncCounterNotifyEvent * /* to */
+);
+
+static void
+ServertimeBlockHandler(
+ pointer /* env */,
+ struct timeval ** /* wt */,
+ pointer /* LastSelectMask */
+);
+
+static int
+SyncAddTriggerToCounter(
+ SyncTrigger * /* pTrigger */
+);
+
+extern void
+SyncAlarmCounterDestroyed(
+ SyncTrigger * /* pTrigger */
+);
+
+static void
+SyncAlarmTriggerFired(
+ SyncTrigger * /* pTrigger */
+);
+
+static void
+SyncAwaitTriggerFired(
+ SyncTrigger * /* pTrigger */
+);
+
+static int
+SyncChangeAlarmAttributes(
+ ClientPtr /* client */,
+ SyncAlarm * /* pAlarm */,
+ Mask /* mask */,
+ CARD32 * /* values */
+);
+
+static Bool
+SyncCheckTriggerNegativeComparison(
+ SyncTrigger * /* pTrigger */,
+ CARD64 /* oldval */
+);
+
+static Bool
+SyncCheckTriggerNegativeTransition(
+ SyncTrigger * /* pTrigger */,
+ CARD64 /* oldval */
+);
+
+static Bool
+SyncCheckTriggerPositiveComparison(
+ SyncTrigger * /* pTrigger */,
+ CARD64 /* oldval */
+);
+
+static Bool
+SyncCheckTriggerPositiveTransition(
+ SyncTrigger * /* pTrigger */,
+ CARD64 /* oldval */
+);
+
+static SyncCounter *
+SyncCreateCounter(
+ ClientPtr /* client */,
+ XSyncCounter /* id */,
+ CARD64 /* initialvalue */
+);
+
+static void SyncComputeBracketValues(
+ SyncCounter * /* pCounter */,
+ Bool /* startOver */
+);
+
+static void
+SyncDeleteTriggerFromCounter(
+ SyncTrigger * /* pTrigger */
+);
+
+static Bool
+SyncEventSelectForAlarm(
+ SyncAlarm * /* pAlarm */,
+ ClientPtr /* client */,
+ Bool /* wantevents */
+);
+
+static void
+SyncInitServerTime(
+ void
+);
+
+static void
+SyncResetProc(
+ ExtensionEntry * /* extEntry */
+);
+
+static void
+SyncSendAlarmNotifyEvents(
+ SyncAlarm * /* pAlarm */
+);
+
+static void
+SyncSendCounterNotifyEvents(
+ ClientPtr /* client */,
+ SyncAwait ** /* ppAwait */,
+ int /* num_events */
+);
+
+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(pTrigger)
+ SyncTrigger *pTrigger;
+{
+ SyncTriggerList *pCur, *pPrev = NULL;
+
+ /* pCounter needs to be stored in pTrigger before calling here. */
+
+ if (!pTrigger->pCounter)
+ return;
+
+ for (pCur = pTrigger->pCounter->pTriglist; pCur; pCur = pCur->next)
+ {
+ if (pCur->pTrigger == pTrigger)
+ {
+ if (pPrev)
+ pPrev->next = pCur->next;
+ else
+ pTrigger->pCounter->pTriglist = pCur->next;
+ xfree(pCur);
+ break;
+ }
+ }
+
+ if (IsSystemCounter(pTrigger->pCounter))
+ SyncComputeBracketValues(pTrigger->pCounter, /*startOver*/ TRUE);
+}
+
+
+static int
+SyncAddTriggerToCounter(pTrigger)
+ 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 = (SyncTriggerList *)xalloc(sizeof(SyncTriggerList))))
+ return BadAlloc;
+
+ pCur->pTrigger = pTrigger;
+ pCur->next = pTrigger->pCounter->pTriglist;
+ pTrigger->pCounter->pTriglist = pCur;
+
+ if (IsSystemCounter(pTrigger->pCounter))
+ SyncComputeBracketValues(pTrigger->pCounter, /*startOver*/ TRUE);
+
+ 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(pTrigger, oldval)
+ SyncTrigger *pTrigger;
+ CARD64 oldval;
+{
+ return (pTrigger->pCounter == NULL ||
+ XSyncValueGreaterOrEqual(pTrigger->pCounter->value,
+ pTrigger->test_value));
+}
+
+static Bool
+SyncCheckTriggerNegativeComparison(pTrigger, oldval)
+ SyncTrigger *pTrigger;
+ CARD64 oldval;
+{
+ return (pTrigger->pCounter == NULL ||
+ XSyncValueLessOrEqual(pTrigger->pCounter->value,
+ pTrigger->test_value));
+}
+
+static Bool
+SyncCheckTriggerPositiveTransition(pTrigger, oldval)
+ SyncTrigger *pTrigger;
+ CARD64 oldval;
+{
+ return (pTrigger->pCounter == NULL ||
+ (XSyncValueLessThan(oldval, pTrigger->test_value) &&
+ XSyncValueGreaterOrEqual(pTrigger->pCounter->value,
+ pTrigger->test_value)));
+}
+
+static Bool
+SyncCheckTriggerNegativeTransition(pTrigger, oldval)
+ SyncTrigger *pTrigger;
+ CARD64 oldval;
+{
+ return (pTrigger->pCounter == NULL ||
+ (XSyncValueGreaterThan(oldval, pTrigger->test_value) &&
+ XSyncValueLessOrEqual(pTrigger->pCounter->value,
+ pTrigger->test_value)));
+}
+
+
+
+static int
+SyncInitTrigger(client, pTrigger, counter, changes)
+ ClientPtr client; /* so we can set errorValue */
+ SyncTrigger *pTrigger;
+ XSyncCounter counter;
+ Mask changes;
+{
+ SyncCounter *pCounter = pTrigger->pCounter;
+ int status;
+ Bool newcounter = FALSE;
+
+ if (changes & XSyncCACounter)
+ {
+ if (counter == None)
+ pCounter = NULL;
+ else if (!(pCounter = (SyncCounter *)SecurityLookupIDByType(
+ client, counter, RTCounter, SecurityReadAccess)))
+ {
+ client->errorValue = counter;
+ return SyncErrorBase + XSyncBadCounter;
+ }
+ 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 ((status = SyncAddTriggerToCounter(pTrigger)) != Success)
+ return status;
+ }
+ else if (IsSystemCounter(pCounter))
+ {
+ SyncComputeBracketValues(pCounter, /*startOver*/ TRUE);
+ }
+
+ 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(pAlarm)
+ 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(client, ppAwait, num_events)
+ ClientPtr client;
+ SyncAwait **ppAwait;
+ int num_events;
+{
+ xSyncCounterNotifyEvent *pEvents, *pev;
+ int i;
+
+ if (client->clientGone)
+ return;
+ pev = pEvents = (xSyncCounterNotifyEvent *)
+ ALLOCATE_LOCAL(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);
+ DEALLOCATE_LOCAL(pEvents);
+}
+
+
+/* This function is called when an alarm's counter is destroyed.
+ * It is plugged into pTrigger->CounterDestroyed (for alarm triggers).
+ */
+void
+SyncAlarmCounterDestroyed(pTrigger)
+ 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(pTrigger)
+ 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(pTrigger)
+ 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 = (SyncAwait **)ALLOCATE_LOCAL(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);
+ DEALLOCATE_LOCAL(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(pCounter, newval)
+ 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, /* startOver */ FALSE);
+ }
+}
+
+
+/* loosely based on dix/events.c/EventSelectForWindow */
+static Bool
+SyncEventSelectForAlarm(pAlarm, client, wantevents)
+ 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 = (SyncAlarmClientList *) xalloc(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))
+ {
+ xfree(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(client, pAlarm, mask, values)
+ 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(client, id, initialvalue)
+ ClientPtr client;
+ XSyncCounter id;
+ CARD64 initialvalue;
+{
+ SyncCounter *pCounter;
+
+ if (!(pCounter = (SyncCounter *) xalloc(sizeof(SyncCounter))))
+ return (SyncCounter *)NULL;
+
+ if (!AddResource(id, RTCounter, (pointer) pCounter))
+ {
+ xfree((pointer) pCounter);
+ return (SyncCounter *)NULL;
+ }
+
+ pCounter->client = client;
+ pCounter->id = id;
+ pCounter->value = initialvalue;
+ pCounter->pTriglist = NULL;
+ pCounter->beingDestroyed = FALSE;
+ pCounter->pSysCounterInfo = NULL;
+ return pCounter;
+}
+
+static int FreeCounter(
+ pointer /*env*/,
+ XID /*id*/
+);
+
+/*
+ * ***** System Counter utilities
+ */
+
+pointer
+SyncCreateSystemCounter(name, initial, resolution, counterType,
+ QueryValue, BracketValues)
+ 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 = (SyncCounter **)xrealloc(SysCounterList,
+ (SyncNumSystemCounters+1)*sizeof(SyncCounter *));
+ if (!SysCounterList)
+ return (pointer)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);
+ if (RTCounter == 0)
+ {
+ return (pointer)NULL;
+ }
+ }
+
+ pCounter = SyncCreateCounter((ClientPtr)NULL, FakeClientID(0), initial);
+
+ if (pCounter)
+ {
+ SysCounterInfo *psci;
+
+ psci = (SysCounterInfo *)xalloc(sizeof(SysCounterInfo));
+ if (!psci)
+ {
+ FreeResource(pCounter->id, RT_NONE);
+ return (pointer) 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 (pointer) pCounter;
+}
+
+void
+SyncDestroySystemCounter(pSysCounter)
+ pointer pSysCounter;
+{
+ SyncCounter *pCounter = (SyncCounter *)pSysCounter;
+ FreeResource(pCounter->id, RT_NONE);
+}
+
+static void
+SyncComputeBracketValues(pCounter, startOver)
+ SyncCounter *pCounter;
+ Bool startOver;
+{
+ SyncTriggerList *pCur;
+ SyncTrigger *pTrigger;
+ SysCounterInfo *psci = pCounter->pSysCounterInfo;
+ CARD64 *pnewgtval = NULL;
+ CARD64 *pnewltval = NULL;
+ SyncCounterType ct;
+
+ if (!pCounter)
+ return;
+
+ ct = pCounter->pSysCounterInfo->counterType;
+ if (ct == XSyncCounterNeverChanges)
+ return;
+
+ if (startOver)
+ {
+ 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 == XSyncPositiveTransition &&
+ ct != XSyncCounterNeverIncreases)
+ ||
+ (pTrigger->test_type == XSyncNegativeTransition &&
+ ct != XSyncCounterNeverDecreases)
+ )
+ {
+ if (XSyncValueLessThan(pCounter->value, pTrigger->test_value))
+ {
+ if (XSyncValueLessThan(pTrigger->test_value,
+ psci->bracket_greater))
+ {
+ psci->bracket_greater = pTrigger->test_value;
+ pnewgtval = &psci->bracket_greater;
+ }
+ else
+ if (XSyncValueGreaterThan(pTrigger->test_value,
+ psci->bracket_less))
+ {
+ psci->bracket_less = pTrigger->test_value;
+ pnewltval = &psci->bracket_less;
+ }
+ }
+ }
+ } /* end for each trigger */
+
+ if (pnewgtval || pnewltval)
+ {
+ (*psci->BracketValues)((pointer)pCounter, pnewltval, pnewgtval);
+ }
+}
+
+/*
+ * ***** Resource delete functions
+ */
+
+/* ARGSUSED */
+static int
+FreeAlarm(addr, id)
+ pointer 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);
+
+ xfree(pAlarm);
+ return Success;
+}
+
+
+/*
+ * ** Cleanup after the destruction of a Counter
+ */
+/* ARGSUSED */
+static int
+FreeCounter(env, id)
+ pointer 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;
+ xfree(ptl); /* destroy the trigger list as we go */
+ }
+ if (IsSystemCounter(pCounter))
+ {
+ int i, found = 0;
+
+ xfree(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--;
+ }
+ xfree(pCounter);
+ return Success;
+}
+
+/*
+ * ** Cleanup after Await
+ */
+/* ARGSUSED */
+static int
+FreeAwait(addr, id)
+ pointer 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);
+ }
+ xfree(pAwaitUnion);
+ return Success;
+}
+
+/* loosely based on dix/events.c/OtherClientGone */
+static int
+FreeAlarmClient(value, id)
+ pointer value; /* must conform to DeleteType */
+ 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;
+ xfree(pCur);
+ return(Success);
+ }
+ }
+ FatalError("alarm client not on event list");
+ /*NOTREACHED*/
+}
+
+
+/*
+ * ***** Proc functions
+ */
+
+
+/*
+ * ** Initialize the extension
+ */
+static int
+ProcSyncInitialize(client)
+ ClientPtr client;
+{
+ xSyncInitializeReply rep;
+ int n;
+
+ REQUEST_SIZE_MATCH(xSyncInitializeReq);
+
+ 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 (client->noClientException);
+}
+
+/*
+ * ** Get list of system counters available through the extension
+ */
+static int
+ProcSyncListSystemCounters(client)
+ 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 += (sz_xSyncSystemCounter + strlen(name) + 3) & ~3;
+ }
+
+ if (len)
+ {
+ walklist = list = (xSyncSystemCounter *) ALLOCATE_LOCAL(len);
+ if (!list)
+ return BadAlloc;
+ }
+
+ rep.length = len >> 2;
+
+ if (client->swapped)
+ {
+ register 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)
+ {
+ register 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) +
+ ((sz_xSyncSystemCounter + namelen + 3) & ~3));
+ }
+
+ WriteToClient(client, sizeof(rep), (char *) &rep);
+ if (len)
+ {
+ WriteToClient(client, len, (char *) list);
+ DEALLOCATE_LOCAL(list);
+ }
+
+ return (client->noClientException);
+}
+
+/*
+ * ** Set client Priority
+ */
+static int
+ProcSyncSetPriority(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncSetPriorityReq);
+ ClientPtr priorityclient;
+
+ REQUEST_SIZE_MATCH(xSyncSetPriorityReq);
+
+ if (stuff->id == None)
+ priorityclient = client;
+ else if (!(priorityclient = LookupClient(stuff->id, client)))
+ {
+ client->errorValue = stuff->id;
+ return BadMatch;
+ }
+
+ 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(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncGetPriorityReq);
+ xSyncGetPriorityReply rep;
+ ClientPtr priorityclient;
+
+ REQUEST_SIZE_MATCH(xSyncGetPriorityReq);
+
+ if (stuff->id == None)
+ priorityclient = client;
+ else if (!(priorityclient = LookupClient(stuff->id, client)))
+ {
+ client->errorValue = stuff->id;
+ return BadMatch;
+ }
+
+ rep.type = X_Reply;
+ rep.length = 0;
+ rep.sequenceNumber = client->sequence;
+ rep.priority = priorityclient->priority;
+
+ if (client->swapped)
+ {
+ register char n;
+ swaps(&rep.sequenceNumber, n);
+ swapl(&rep.priority, n);
+ }
+
+ WriteToClient(client, sizeof(xSyncGetPriorityReply), (char *) &rep);
+
+ return (client->noClientException);
+}
+
+/*
+ * ** Create a new counter
+ */
+static int
+ProcSyncCreateCounter(client)
+ 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 (client->noClientException);
+}
+
+/*
+ * ** Set Counter value
+ */
+static int
+ProcSyncSetCounter(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncSetCounterReq);
+ SyncCounter *pCounter;
+ CARD64 newvalue;
+
+ REQUEST_SIZE_MATCH(xSyncSetCounterReq);
+
+ pCounter = (SyncCounter *)SecurityLookupIDByType(client, stuff->cid,
+ RTCounter, SecurityWriteAccess);
+ if (pCounter == NULL)
+ {
+ client->errorValue = stuff->cid;
+ return SyncErrorBase + XSyncBadCounter;
+ }
+
+ 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(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncChangeCounterReq);
+ SyncCounter *pCounter;
+ CARD64 newvalue;
+ Bool overflow;
+
+ REQUEST_SIZE_MATCH(xSyncChangeCounterReq);
+
+ pCounter = (SyncCounter *) SecurityLookupIDByType(client, stuff->cid,
+ RTCounter, SecurityWriteAccess);
+ if (pCounter == NULL)
+ {
+ client->errorValue = stuff->cid;
+ return SyncErrorBase + XSyncBadCounter;
+ }
+
+ 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(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncDestroyCounterReq);
+ SyncCounter *pCounter;
+
+ REQUEST_SIZE_MATCH(xSyncDestroyCounterReq);
+
+ pCounter = (SyncCounter *)SecurityLookupIDByType(client, stuff->counter,
+ RTCounter, SecurityDestroyAccess);
+ if (pCounter == NULL)
+ {
+ client->errorValue = stuff->counter;
+ return SyncErrorBase + XSyncBadCounter;
+ }
+ if (IsSystemCounter(pCounter))
+ {
+ client->errorValue = stuff->counter;
+ return BadAccess;
+ }
+ FreeResource(pCounter->id, RT_NONE);
+ return Success;
+}
+
+
+/*
+ * ** Await
+ */
+static int
+ProcSyncAwait(client)
+ 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 = (SyncAwaitUnion *)xalloc((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))
+ {
+ xfree(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(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncQueryCounterReq);
+ xSyncQueryCounterReply rep;
+ SyncCounter *pCounter;
+
+ REQUEST_SIZE_MATCH(xSyncQueryCounterReq);
+
+ pCounter = (SyncCounter *)SecurityLookupIDByType(client, stuff->counter,
+ RTCounter, SecurityReadAccess);
+ if (pCounter == NULL)
+ {
+ client->errorValue = stuff->counter;
+ return SyncErrorBase + XSyncBadCounter;
+ }
+
+ 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)
+ {
+ register 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 (client->noClientException);
+}
+
+
+/*
+ * ** Create Alarm
+ */
+static int
+ProcSyncCreateAlarm(client)
+ 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 - (sizeof(xSyncCreateAlarmReq) >> 2);
+ /* 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 = (SyncAlarm *) xalloc(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)
+ {
+ xfree(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)
+ {
+ xfree(pAlarm);
+ return status;
+ }
+
+ if (!AddResource(stuff->id, RTAlarm, pAlarm))
+ {
+ xfree(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(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncChangeAlarmReq);
+ SyncAlarm *pAlarm;
+ long vmask;
+ int len, status;
+
+ REQUEST_AT_LEAST_SIZE(xSyncChangeAlarmReq);
+
+ if (!(pAlarm = (SyncAlarm *)SecurityLookupIDByType(client, stuff->alarm,
+ RTAlarm, SecurityWriteAccess)))
+ {
+ client->errorValue = stuff->alarm;
+ return SyncErrorBase + XSyncBadAlarm;
+ }
+
+ vmask = stuff->valueMask;
+ len = client->req_len - (sizeof(xSyncChangeAlarmReq) >> 2);
+ /* 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(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncQueryAlarmReq);
+ SyncAlarm *pAlarm;
+ xSyncQueryAlarmReply rep;
+ SyncTrigger *pTrigger;
+
+ REQUEST_SIZE_MATCH(xSyncQueryAlarmReq);
+
+ pAlarm = (SyncAlarm *)SecurityLookupIDByType(client, stuff->alarm,
+ RTAlarm, SecurityReadAccess);
+ if (!pAlarm)
+ {
+ client->errorValue = stuff->alarm;
+ return (SyncErrorBase + XSyncBadAlarm);
+ }
+
+ rep.type = X_Reply;
+ rep.length = (sizeof(xSyncQueryAlarmReply) - sizeof(xGenericReply)) >> 2;
+ 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)
+ {
+ register 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 (client->noClientException);
+}
+
+
+static int
+ProcSyncDestroyAlarm(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncDestroyAlarmReq);
+
+ REQUEST_SIZE_MATCH(xSyncDestroyAlarmReq);
+
+ if (!((SyncAlarm *)SecurityLookupIDByType(client, stuff->alarm,
+ RTAlarm, SecurityDestroyAccess)))
+ {
+ client->errorValue = stuff->alarm;
+ return SyncErrorBase + XSyncBadAlarm;
+ }
+
+ FreeResource(stuff->alarm, RT_NONE);
+ return (client->noClientException);
+}
+
+/*
+ * ** Given an extension request, call the appropriate request procedure
+ */
+static int
+ProcSyncDispatch(client)
+ 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(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncInitializeReq);
+ register char n;
+
+ swaps(&stuff->length, n);
+ REQUEST_SIZE_MATCH (xSyncInitializeReq);
+
+ return ProcSyncInitialize(client);
+}
+
+static int
+SProcSyncListSystemCounters(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncListSystemCountersReq);
+ register char n;
+
+ swaps(&stuff->length, n);
+ REQUEST_SIZE_MATCH (xSyncListSystemCountersReq);
+
+ return ProcSyncListSystemCounters(client);
+}
+
+static int
+SProcSyncCreateCounter(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncCreateCounterReq);
+ register 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(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncSetCounterReq);
+ register 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(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncChangeCounterReq);
+ register 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(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncQueryCounterReq);
+ register char n;
+
+ swaps(&stuff->length, n);
+ REQUEST_SIZE_MATCH (xSyncQueryCounterReq);
+ swapl(&stuff->counter, n);
+
+ return ProcSyncQueryCounter(client);
+}
+
+static int
+SProcSyncDestroyCounter(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncDestroyCounterReq);
+ register char n;
+
+ swaps(&stuff->length, n);
+ REQUEST_SIZE_MATCH (xSyncDestroyCounterReq);
+ swapl(&stuff->counter, n);
+
+ return ProcSyncDestroyCounter(client);
+}
+
+static int
+SProcSyncAwait(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncAwaitReq);
+ register char n;
+
+ swaps(&stuff->length, n);
+ REQUEST_AT_LEAST_SIZE(xSyncAwaitReq);
+ SwapRestL(stuff);
+
+ return ProcSyncAwait(client);
+}
+
+
+static int
+SProcSyncCreateAlarm(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncCreateAlarmReq);
+ register 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(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncChangeAlarmReq);
+ register 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(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncQueryAlarmReq);
+ register char n;
+
+ swaps(&stuff->length, n);
+ REQUEST_SIZE_MATCH (xSyncQueryAlarmReq);
+ swapl(&stuff->alarm, n);
+
+ return ProcSyncQueryAlarm(client);
+}
+
+static int
+SProcSyncDestroyAlarm(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncDestroyAlarmReq);
+ register char n;
+
+ swaps(&stuff->length, n);
+ REQUEST_SIZE_MATCH (xSyncDestroyAlarmReq);
+ swapl(&stuff->alarm, n);
+
+ return ProcSyncDestroyAlarm(client);
+}
+
+static int
+SProcSyncSetPriority(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncSetPriorityReq);
+ register char n;
+
+ swaps(&stuff->length, n);
+ REQUEST_SIZE_MATCH (xSyncSetPriorityReq);
+ swapl(&stuff->id, n);
+ swapl(&stuff->priority, n);
+
+ return ProcSyncSetPriority(client);
+}
+
+static int
+SProcSyncGetPriority(client)
+ ClientPtr client;
+{
+ REQUEST(xSyncGetPriorityReq);
+ register char n;
+
+ swaps(&stuff->length, n);
+ REQUEST_SIZE_MATCH (xSyncGetPriorityReq);
+ swapl(&stuff->id, n);
+
+ return ProcSyncGetPriority(client);
+}
+
+
+static int
+SProcSyncDispatch(client)
+ 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(from, to)
+ xSyncCounterNotifyEvent *from, *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(from, to)
+ xSyncAlarmNotifyEvent *from, *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(extEntry)
+ ExtensionEntry *extEntry;
+{
+ xfree(SysCounterList);
+ SysCounterList = NULL;
+ RTCounter = 0;
+}
+
+
+/*
+ * ** Initialise the extension.
+ */
+void
+SyncExtensionInit(INITARGS)
+{
+ ExtensionEntry *extEntry;
+
+ if (RTCounter == 0)
+ {
+ RTCounter = CreateNewResourceType(FreeCounter);
+ }
+ RTAlarm = CreateNewResourceType(FreeAlarm);
+ RTAwait = CreateNewResourceType(FreeAwait)|RC_NEVERRETAIN;
+ RTAlarmClient = CreateNewResourceType(FreeAlarmClient)|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();
+
+#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
+ */
+/*ARGSUSED*/
+static void ServertimeBlockHandler(env, wt, LastSelectMask)
+pointer env;
+struct timeval **wt;
+pointer 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(env, rc, LastSelectMask)
+pointer env;
+int rc;
+pointer LastSelectMask;
+{
+ if (pnext_time)
+ {
+ GetTime();
+
+ if (XSyncValueGreaterOrEqual(Now, *pnext_time))
+ {
+ SyncChangeCounter(ServertimeCounter, Now);
+ }
+ }
+}
+
+static void
+ServertimeQueryValue(pCounter, pValue_return)
+ pointer pCounter;
+ CARD64 *pValue_return;
+{
+ GetTime();
+ *pValue_return = Now;
+}
+
+static void
+ServertimeBracketValues(pCounter, pbracket_less, pbracket_greater)
+ pointer 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()
+{
+ CARD64 resolution;
+
+ XSyncIntsToValue(&Now, GetTimeInMillis(), 0);
+ XSyncIntToValue(&resolution, 4);
+ ServertimeCounter = SyncCreateSystemCounter("SERVERTIME", Now, resolution,
+ XSyncCounterNeverDecreases,
+ ServertimeQueryValue, ServertimeBracketValues);
+ pnext_time = NULL;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-06 05:47:15 +0000