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+/* $Xorg: NextEvent.c,v 1.8 2001/02/09 02:03:55 xorgcvs Exp $ */
+
+/***********************************************************
+Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts,
+Copyright 1993 by Sun Microsystems, Inc. Mountain View, CA.
+
+ 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 Sun not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL 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.
+
+SUN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FIT-
+NESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SUN BE LI-
+ABLE 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.
+
+******************************************************************/
+
+/*
+
+Copyright 1987, 1988, 1994, 1998, 2001 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.
+
+*/
+/* $XFree86: xc/lib/Xt/NextEvent.c,v 3.26 2002/06/04 21:55:42 dawes Exp $ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "IntrinsicI.h"
+#include <stdio.h>
+#include <errno.h>
+
+#ifdef __UNIXOS2__
+#include <sys/time.h>
+#endif
+
+static TimerEventRec* freeTimerRecs;
+static WorkProcRec* freeWorkRecs;
+static SignalEventRec* freeSignalRecs;
+
+/* Some systems running NTP daemons are known to return strange usec
+ * values from gettimeofday.
+ */
+
+#ifndef NEEDS_NTPD_FIXUP
+# if defined(sun) || defined(MOTOROLA) || (defined(__osf__) && defined(__alpha))
+# define NEEDS_NTPD_FIXUP 1
+# else
+# define NEEDS_NTPD_FIXUP 0
+# endif
+#endif
+
+#if NEEDS_NTPD_FIXUP
+#define FIXUP_TIMEVAL(t) { \
+ while ((t).tv_usec >= 1000000) { \
+ (t).tv_usec -= 1000000; \
+ (t).tv_sec++; \
+ } \
+ while ((t).tv_usec < 0) { \
+ if ((t).tv_sec > 0) { \
+ (t).tv_usec += 1000000; \
+ (t).tv_sec--; \
+ } else { \
+ (t).tv_usec = 0; \
+ break; \
+ } \
+ }}
+#else
+#define FIXUP_TIMEVAL(t)
+#endif /*NEEDS_NTPD_FIXUP*/
+
+/*
+ * Private routines
+ */
+#define ADD_TIME(dest, src1, src2) { \
+ if(((dest).tv_usec = (src1).tv_usec + (src2).tv_usec) >= 1000000) {\
+ (dest).tv_usec -= 1000000;\
+ (dest).tv_sec = (src1).tv_sec + (src2).tv_sec + 1 ; \
+ } else { (dest).tv_sec = (src1).tv_sec + (src2).tv_sec ; \
+ if(((dest).tv_sec >= 1) && (((dest).tv_usec <0))) { \
+ (dest).tv_sec --;(dest).tv_usec += 1000000; } } }
+
+
+#define TIMEDELTA(dest, src1, src2) { \
+ if(((dest).tv_usec = (src1).tv_usec - (src2).tv_usec) < 0) {\
+ (dest).tv_usec += 1000000;\
+ (dest).tv_sec = (src1).tv_sec - (src2).tv_sec - 1;\
+ } else (dest).tv_sec = (src1).tv_sec - (src2).tv_sec; }
+
+#define IS_AFTER(t1, t2) (((t2).tv_sec > (t1).tv_sec) \
+ || (((t2).tv_sec == (t1).tv_sec)&& ((t2).tv_usec > (t1).tv_usec)))
+
+#define IS_AT_OR_AFTER(t1, t2) (((t2).tv_sec > (t1).tv_sec) \
+ || (((t2).tv_sec == (t1).tv_sec)&& ((t2).tv_usec >= (t1).tv_usec)))
+
+#ifdef USE_POLL
+#ifndef XT_DEFAULT_FDLIST_SIZE
+#define XT_DEFAULT_FDLIST_SIZE 32
+#endif
+#endif
+
+static void AdjustHowLong (
+ unsigned long *howlong,
+ struct timeval *start_time)
+{
+ struct timeval new_time, time_spent, lstart_time;
+
+ lstart_time = *start_time;
+ X_GETTIMEOFDAY (&new_time);
+ FIXUP_TIMEVAL(new_time);
+ TIMEDELTA(time_spent, new_time, lstart_time);
+ if(*howlong <= (unsigned long)(time_spent.tv_sec*1000+time_spent.tv_usec/1000))
+ *howlong = (unsigned long)0; /* Timed out */
+ else
+ *howlong -= (time_spent.tv_sec*1000+time_spent.tv_usec/1000);
+}
+
+typedef struct {
+ struct timeval cur_time;
+ struct timeval start_time;
+ struct timeval wait_time;
+ struct timeval new_time;
+ struct timeval time_spent;
+ struct timeval max_wait_time;
+#ifndef USE_POLL
+ struct timeval *wait_time_ptr;
+#else
+ int poll_wait;
+#endif
+} wait_times_t, *wait_times_ptr_t;
+
+static struct timeval zero_time = { 0 , 0};
+#ifndef USE_POLL
+static fd_set zero_fd;
+#else
+#define X_BLOCK -1
+#define X_DONT_BLOCK 0
+#endif
+
+static void InitTimes (
+ Boolean block,
+ unsigned long* howlong,
+ wait_times_ptr_t wt)
+{
+ if (block) {
+ X_GETTIMEOFDAY (&wt->cur_time);
+ FIXUP_TIMEVAL(wt->cur_time);
+ wt->start_time = wt->cur_time;
+ if(howlong == NULL) { /* special case for ever */
+#ifndef USE_POLL
+ wt->wait_time_ptr = NULL;
+#else
+ wt->poll_wait = X_BLOCK;
+#endif
+ } else { /* block until at most */
+ wt->max_wait_time.tv_sec = *howlong/1000;
+ wt->max_wait_time.tv_usec = (*howlong %1000)*1000;
+#ifndef USE_POLL
+ wt->wait_time_ptr = &wt->max_wait_time;
+#else
+ wt->poll_wait = *howlong;
+#endif
+ }
+ } else { /* don't block */
+ wt->max_wait_time = zero_time;
+#ifndef USE_POLL
+ wt->wait_time_ptr = &wt->max_wait_time;
+#else
+ wt->poll_wait = X_DONT_BLOCK;
+#endif
+ }
+}
+
+typedef struct {
+#ifndef USE_POLL
+ fd_set rmask, wmask, emask;
+ int nfds;
+#else
+ struct pollfd* fdlist;
+ struct pollfd* stack;
+ int fdlistlen, num_dpys;
+#endif
+} wait_fds_t, *wait_fds_ptr_t;
+
+static void InitFds (
+ XtAppContext app,
+ Boolean ignoreEvents,
+ Boolean ignoreInputs,
+ wait_fds_ptr_t wf)
+{
+ int ii;
+ app->rebuild_fdlist = FALSE;
+#ifndef USE_POLL
+ wf->nfds = app->fds.nfds;
+ if( !ignoreInputs ) {
+ wf->rmask = app->fds.rmask;
+ wf->wmask = app->fds.wmask;
+ wf->emask = app->fds.emask;
+ } else
+ wf->rmask = wf->wmask = wf->emask = zero_fd;
+
+ if (!ignoreEvents)
+ for (ii = 0; ii < app->count; ii++) {
+ FD_SET (ConnectionNumber(app->list[ii]), &wf->rmask);
+ }
+#else
+#ifndef POLLRDNORM
+#define POLLRDNORM 0
+#endif
+
+#ifndef POLLRDBAND
+#define POLLRDBAND 0
+#endif
+
+#ifndef POLLWRNORM
+#define POLLWRNORM 0
+#endif
+
+#ifndef POLLWRBAND
+#define POLLWRBAND 0
+#endif
+
+#define XPOLL_READ (POLLIN|POLLRDNORM|POLLPRI|POLLRDBAND)
+#define XPOLL_WRITE (POLLOUT|POLLWRNORM|POLLWRBAND)
+#define XPOLL_EXCEPT 0
+
+ if (!ignoreEvents)
+ wf->fdlistlen = wf->num_dpys = app->count;
+ else
+ wf->fdlistlen = wf->num_dpys = 0;
+
+ if (!ignoreInputs && app->input_list != NULL) {
+ int ii;
+ for (ii = 0; ii < (int) app->input_max; ii++)
+ if (app->input_list[ii] != NULL)
+ wf->fdlistlen++;
+ }
+
+ if (!wf->fdlist || wf->fdlist == wf->stack) {
+ wf->fdlist = (struct pollfd*)
+ XtStackAlloc (sizeof (struct pollfd) * wf->fdlistlen, wf->stack);
+ } else {
+ wf->fdlist = (struct pollfd*)
+ XtRealloc ((char*) wf->fdlist,
+ sizeof (struct pollfd) * wf->fdlistlen);
+ }
+
+ if (wf->fdlistlen) {
+ struct pollfd* fdlp = wf->fdlist;
+ InputEvent* iep;
+
+ if (!ignoreEvents)
+ for (ii = 0 ; ii < wf->num_dpys; ii++, fdlp++) {
+ fdlp->fd = ConnectionNumber (app->list[ii]);
+ fdlp->events = POLLIN;
+ }
+ if (!ignoreInputs && app->input_list != NULL)
+ for (ii = 0; ii < app->input_max; ii++)
+ if (app->input_list[ii] != NULL) {
+ iep = app->input_list[ii];
+ fdlp->fd = ii;
+ fdlp->events = 0;
+ for ( ; iep; iep = iep->ie_next) {
+ if (iep->ie_condition & XtInputReadMask)
+ fdlp->events |= XPOLL_READ;
+ if (iep->ie_condition & XtInputWriteMask)
+ fdlp->events |= XPOLL_WRITE;
+ if (iep->ie_condition & XtInputExceptMask)
+ fdlp->events |= XPOLL_EXCEPT;
+ }
+ fdlp++;
+ }
+ }
+#endif
+}
+
+static void AdjustTimes (
+ XtAppContext app,
+ Boolean block,
+ unsigned long* howlong,
+ Boolean ignoreTimers,
+ wait_times_ptr_t wt)
+{
+ if (app->timerQueue != NULL && !ignoreTimers && block) {
+ if (IS_AFTER (wt->cur_time, app->timerQueue->te_timer_value)) {
+ TIMEDELTA (wt->wait_time, app->timerQueue->te_timer_value, wt->cur_time);
+ if (howlong == NULL || IS_AFTER (wt->wait_time, wt->max_wait_time))
+#ifndef USE_POLL
+ wt->wait_time_ptr = &wt->wait_time;
+ else
+ wt->wait_time_ptr = &wt->max_wait_time;
+ } else
+ wt->wait_time_ptr = &zero_time;
+ }
+#else
+ wt->poll_wait = wt->wait_time.tv_sec * 1000 + wt->wait_time.tv_usec / 1000;
+ else
+ wt->poll_wait = wt->max_wait_time.tv_sec * 1000 + wt->max_wait_time.tv_usec / 1000;
+ } else
+ wt->poll_wait = X_DONT_BLOCK;
+ }
+#endif
+}
+
+
+static int IoWait (
+ wait_times_ptr_t wt,
+ wait_fds_ptr_t wf)
+{
+#ifndef USE_POLL
+ return Select (wf->nfds, &wf->rmask, &wf->wmask, &wf->emask,
+ wt->wait_time_ptr);
+#else
+ return poll (wf->fdlist, wf->fdlistlen, wt->poll_wait);
+#endif
+}
+
+
+static void FindInputs (
+ XtAppContext app,
+ wait_fds_ptr_t wf,
+ int nfds,
+ Boolean ignoreEvents,
+ Boolean ignoreInputs,
+ int* dpy_no,
+ int* found_input)
+{
+ XtInputMask condition;
+ InputEvent *ep;
+ int ii;
+#ifndef USE_POLL /* { check ready file descriptors block */
+#ifdef XTHREADS
+ fd_set rmask;
+#endif
+ int dd;
+ *dpy_no = -1;
+ *found_input = False;
+
+#ifdef XTHREADS
+ rmask = app->fds.rmask;
+ for (dd = app->count; dd-- > 0; )
+ FD_SET (ConnectionNumber (app->list[dd]), &rmask);
+#endif
+
+ for (ii = 0; ii < wf->nfds && nfds > 0; ii++) {
+ condition = 0;
+ if (FD_ISSET (ii, &wf->rmask)
+#ifdef XTHREADS
+ && FD_ISSET (ii, &rmask)
+#endif
+ ) {
+ nfds--;
+ if (!ignoreEvents) {
+ for (dd = 0; dd < app->count; dd++) {
+ if (ii == ConnectionNumber (app->list[dd])) {
+ if (*dpy_no == -1) {
+ if (XEventsQueued (app->list[dd], QueuedAfterReading ))
+ *dpy_no = dd;
+ /*
+ * An error event could have arrived
+ * without any real events, or events
+ * could have been swallowed by Xlib,
+ * or the connection may be broken.
+ * We can't tell the difference, so
+ * assume Xlib will eventually discover
+ * a broken connection.
+ */
+ }
+ goto ENDILOOP;
+ }
+ }
+ }
+ condition = XtInputReadMask;
+ }
+ if (FD_ISSET (ii, &wf->wmask)
+#ifdef XTHREADS
+ && FD_ISSET (ii, &app->fds.wmask)
+#endif
+ ) {
+ condition |= XtInputWriteMask;
+ nfds--;
+ }
+ if (FD_ISSET (ii, &wf->emask)
+#ifdef XTHREADS
+ && FD_ISSET (ii, &app->fds.emask)
+#endif
+ ) {
+ condition |= XtInputExceptMask;
+ nfds--;
+ }
+ if (condition) {
+ for (ep = app->input_list[ii]; ep; ep = ep->ie_next)
+ if (condition & ep->ie_condition) {
+ /* make sure this input isn't already marked outstanding */
+ InputEvent *oq;
+ for (oq = app->outstandingQueue; oq; oq = oq->ie_oq)
+ if (oq == ep)
+ break;
+ if (!oq)
+ {
+ ep->ie_oq = app->outstandingQueue;
+ app->outstandingQueue = ep;
+ }
+ }
+ *found_input = True;
+ }
+ENDILOOP: ;
+ } /* endfor */
+#else /* }{ */
+ struct pollfd* fdlp;
+
+ *dpy_no = -1;
+ *found_input = False;
+
+ if (!ignoreEvents) {
+ fdlp = wf->fdlist;
+ for (ii = 0; ii < wf->num_dpys; ii++, fdlp++) {
+ if (*dpy_no == -1 && fdlp->revents & (POLLIN|POLLHUP|POLLERR) &&
+#ifdef XTHREADS
+ !(fdlp->revents & POLLNVAL) &&
+#endif
+ XEventsQueued (app->list[ii], QueuedAfterReading)) {
+ *dpy_no = ii;
+ break;
+ }
+ }
+ }
+
+ if (!ignoreInputs) {
+ fdlp = &wf->fdlist[wf->num_dpys];
+ for (ii = wf->num_dpys; ii < wf->fdlistlen; ii++, fdlp++) {
+ condition = 0;
+ if (fdlp->revents) {
+ if (fdlp->revents & (XPOLL_READ|POLLHUP|POLLERR)
+#ifdef XTHREADS
+ && !(fdlp->revents & POLLNVAL)
+#endif
+ )
+ condition = XtInputReadMask;
+ if (fdlp->revents & XPOLL_WRITE)
+ condition |= XtInputWriteMask;
+ if (fdlp->revents & XPOLL_EXCEPT)
+ condition |= XtInputExceptMask;
+ }
+ if (condition) {
+ *found_input = True;
+ for (ep = app->input_list[fdlp->fd]; ep; ep = ep->ie_next)
+ if (condition & ep->ie_condition) {
+ InputEvent *oq;
+ /* make sure this input isn't already marked outstanding */
+ for (oq = app->outstandingQueue; oq; oq = oq->ie_oq)
+ if (oq == ep)
+ break;
+ if (!oq)
+ {
+ ep->ie_oq = app->outstandingQueue;
+ app->outstandingQueue = ep;
+ }
+ }
+ }
+ }
+ }
+#endif /* } */
+}
+
+/*
+ * Routine to block in the toolkit. This should be the only call to select.
+ *
+ * This routine returns when there is something to be done.
+ *
+ * Before calling this with ignoreInputs==False, app->outstandingQueue should
+ * be checked; this routine will not verify that an alternate input source
+ * has not already been enqueued.
+ *
+ *
+ * _XtWaitForSomething( appContext,
+ * ignoreEvent, ignoreTimers, ignoreInputs, ignoreSignals,
+ * block, drop_lock, howlong)
+ * XtAppContext app; (Displays to check wait on)
+ *
+ * Boolean ignoreEvents; (Don't return if XEvents are available
+ * Also implies forget XEvents exist)
+ *
+ * Boolean ignoreTimers; (Ditto for timers)
+ *
+ * Boolean ignoreInputs; (Ditto for input callbacks )
+ *
+ * Boolean ignoreSignals; (Ditto for signals)
+ *
+ * Boolean block; (Okay to block)
+ *
+ * Boolean drop_lock (drop lock before going into select/poll)
+ *
+ * TimeVal howlong; (howlong to wait for if blocking and not
+ * doing Timers... Null means forever.
+ * Maybe should mean shortest of both)
+ * Returns display for which input is available, if any
+ * and if ignoreEvents==False, else returns -1
+ *
+ * if ignoring everything && block=True && howlong=NULL, you'll have
+ * lots of time for coffee; better not try it! In fact, it probably
+ * makes little sense to do this regardless of the value of howlong
+ * (bottom line is, we don't bother checking here).
+ *
+ * If drop_lock is FALSE, the app->lock->mutex is not unlocked before
+ * entering select/poll. It is illegal for drop_lock to be FALSE if
+ * ignoreTimers, ignoreInputs, or ignoreSignals is FALSE.
+ */
+int _XtWaitForSomething(
+ XtAppContext app,
+ _XtBoolean ignoreEvents,
+ _XtBoolean ignoreTimers,
+ _XtBoolean ignoreInputs,
+ _XtBoolean ignoreSignals,
+ _XtBoolean block,
+#ifdef XTHREADS
+ _XtBoolean drop_lock,
+#endif
+ unsigned long *howlong)
+{
+ wait_times_t wt;
+ wait_fds_t wf;
+ int nfds, dpy_no, found_input, dd;
+#ifdef XTHREADS
+ Boolean push_thread = TRUE;
+ Boolean pushed_thread = FALSE;
+ int level = 0;
+#endif
+#ifdef USE_POLL
+ struct pollfd fdlist[XT_DEFAULT_FDLIST_SIZE];
+#endif
+
+#ifdef XTHREADS
+ /* assert ((ignoreTimers && ignoreInputs && ignoreSignals) || drop_lock); */
+ /* If not multi-threaded, never drop lock */
+ if (app->lock == (ThreadAppProc) NULL)
+ drop_lock = FALSE;
+#endif
+
+ InitTimes (block, howlong, &wt);
+
+#ifdef USE_POLL
+ wf.fdlist = NULL;
+ wf.stack = fdlist;
+ wf.fdlistlen = wf.num_dpys = 0;
+#endif
+
+WaitLoop:
+ app->rebuild_fdlist = TRUE;
+
+ while (1) {
+ AdjustTimes (app, block, howlong, ignoreTimers, &wt);
+
+ if (block && app->block_hook_list) {
+ BlockHook hook;
+ for (hook = app->block_hook_list;
+ hook != NULL;
+ hook = hook->next)
+ (*hook->proc) (hook->closure);
+
+ if (!ignoreEvents)
+ /* see if the hook(s) generated any protocol */
+ for (dd = 0; dd < app->count; dd++)
+ if (XEventsQueued(app->list[dd], QueuedAlready)) {
+#ifdef USE_POLL
+ XtStackFree ((XtPointer) wf.fdlist, fdlist);
+#endif
+ return dd;
+ }
+ }
+
+ if (app->rebuild_fdlist)
+ InitFds (app, ignoreEvents, ignoreInputs, &wf);
+
+#ifdef XTHREADS /* { */
+ if (drop_lock) {
+ YIELD_APP_LOCK(app, &push_thread, &pushed_thread, &level);
+ nfds = IoWait (&wt, &wf);
+ RESTORE_APP_LOCK(app, level, &pushed_thread);
+ } else
+#endif /* } */
+ nfds = IoWait (&wt, &wf);
+ if (nfds == -1) {
+ /*
+ * interrupt occured recalculate time value and wait again.
+ */
+ if (errno == EINTR || errno == EAGAIN) {
+ if (errno == EAGAIN) {
+ errno = 0; /* errno is not self reseting */
+ continue;
+ }
+ errno = 0; /* errno is not self reseting */
+
+ /* was it interrupted by a signal that we care about? */
+ if (!ignoreSignals && app->signalQueue != NULL) {
+ SignalEventRec *se_ptr = app->signalQueue;
+ while (se_ptr != NULL) {
+ if (se_ptr->se_notice) {
+ if (block && howlong != NULL)
+ AdjustHowLong (howlong, &wt.start_time);
+#ifdef USE_POLL
+ XtStackFree ((XtPointer) wf.fdlist, fdlist);
+#endif
+ return -1;
+ }
+ se_ptr = se_ptr->se_next;
+ }
+ }
+
+ if (!ignoreEvents)
+ /* get Xlib to detect a bad connection */
+ for (dd = 0; dd < app->count; dd++)
+ if (XEventsQueued(app->list[dd], QueuedAfterReading)) {
+#ifdef USE_POLL
+ XtStackFree ((XtPointer) wf.fdlist, fdlist);
+#endif
+ return dd;
+ }
+
+ if (block) {
+#ifndef USE_POLL
+ if (wt.wait_time_ptr == NULL)
+#else
+ if (wt.poll_wait == X_BLOCK)
+#endif
+ continue;
+ X_GETTIMEOFDAY (&wt.new_time);
+ FIXUP_TIMEVAL (wt.new_time);
+ TIMEDELTA (wt.time_spent, wt.new_time, wt.cur_time);
+ wt.cur_time = wt.new_time;
+#ifndef USE_POLL
+ if (IS_AFTER (wt.time_spent, *wt.wait_time_ptr)) {
+ TIMEDELTA (wt.wait_time, *wt.wait_time_ptr, wt.time_spent);
+ wt.wait_time_ptr = &wt.wait_time;
+ continue;
+ } else
+#else
+ if ((wt.time_spent.tv_sec * 1000 + wt.time_spent.tv_usec / 1000) < wt.poll_wait) {
+ wt.poll_wait -= (wt.time_spent.tv_sec * 1000 + wt.time_spent.tv_usec / 1000);
+ continue;
+ } else
+#endif
+ nfds = 0;
+ }
+ } else {
+ char Errno[12];
+ String param = Errno;
+ Cardinal param_count = 1;
+
+ sprintf( Errno, "%d", errno);
+ XtAppWarningMsg(app, "communicationError","select",
+ XtCXtToolkitError,"Select failed; error code %s",
+ &param, &param_count);
+ continue;
+ }
+ } /* timed out or input available */
+ break;
+ }
+
+ if (nfds == 0) {
+ /* Timed out */
+ if (howlong)
+ *howlong = (unsigned long)0;
+#ifdef USE_POLL
+ XtStackFree ((XtPointer) wf.fdlist, fdlist);
+#endif
+ return -1;
+ }
+
+ if (block && howlong != NULL)
+ AdjustHowLong (howlong, &wt.start_time);
+
+ if (ignoreInputs && ignoreEvents) {
+#ifdef USE_POLL
+ XtStackFree ((XtPointer) wf.fdlist, fdlist);
+#endif
+ return -1;
+ } else
+ FindInputs (app, &wf, nfds,
+ ignoreEvents, ignoreInputs,
+ &dpy_no, &found_input);
+
+ if (dpy_no >= 0 || found_input) {
+#ifdef USE_POLL
+ XtStackFree ((XtPointer) wf.fdlist, fdlist);
+#endif
+ return dpy_no;
+ }
+ goto WaitLoop;
+}
+
+#define IeCallProc(ptr) \
+ (*ptr->ie_proc) (ptr->ie_closure, &ptr->ie_source, (XtInputId*)&ptr);
+
+#define TeCallProc(ptr) \
+ (*ptr->te_proc) (ptr->te_closure, (XtIntervalId*)&ptr);
+
+#define SeCallProc(ptr) \
+ (*ptr->se_proc) (ptr->se_closure, (XtSignalId*)&ptr);
+
+/*
+ * Public Routines
+ */
+
+XtIntervalId XtAddTimeOut(
+ unsigned long interval,
+ XtTimerCallbackProc proc,
+ XtPointer closure)
+{
+ return XtAppAddTimeOut(_XtDefaultAppContext(),
+ interval, proc, closure);
+}
+
+static void QueueTimerEvent(
+ XtAppContext app,
+ TimerEventRec *ptr)
+{
+ TimerEventRec *t,**tt;
+ tt = &app->timerQueue;
+ t = *tt;
+ while (t != NULL &&
+ IS_AFTER(t->te_timer_value, ptr->te_timer_value)) {
+ tt = &t->te_next;
+ t = *tt;
+ }
+ ptr->te_next = t;
+ *tt = ptr;
+}
+
+XtIntervalId XtAppAddTimeOut(
+ XtAppContext app,
+ unsigned long interval,
+ XtTimerCallbackProc proc,
+ XtPointer closure)
+{
+ TimerEventRec *tptr;
+ struct timeval current_time;
+
+ LOCK_APP(app);
+ LOCK_PROCESS;
+ if (freeTimerRecs) {
+ tptr = freeTimerRecs;
+ freeTimerRecs = tptr->te_next;
+ }
+ else tptr = XtNew(TimerEventRec);
+ UNLOCK_PROCESS;
+
+ tptr->te_next = NULL;
+ tptr->te_closure = closure;
+ tptr->te_proc = proc;
+ tptr->app = app;
+ tptr->te_timer_value.tv_sec = interval/1000;
+ tptr->te_timer_value.tv_usec = (interval%1000)*1000;
+ X_GETTIMEOFDAY (&current_time);
+ FIXUP_TIMEVAL(current_time);
+ ADD_TIME(tptr->te_timer_value,tptr->te_timer_value,current_time);
+ QueueTimerEvent(app, tptr);
+ UNLOCK_APP(app);
+ return( (XtIntervalId) tptr);
+}
+
+void XtRemoveTimeOut(
+ XtIntervalId id)
+{
+ TimerEventRec *t, *last, *tid = (TimerEventRec *) id;
+ XtAppContext app = tid->app;
+
+ /* find it */
+ LOCK_APP(app);
+ for(t = app->timerQueue, last = NULL;
+ t != NULL && t != tid;
+ t = t->te_next) last = t;
+
+ if (t == NULL) {
+ UNLOCK_APP(app);
+ return; /* couldn't find it */
+ }
+ if(last == NULL) { /* first one on the list */
+ app->timerQueue = t->te_next;
+ } else last->te_next = t->te_next;
+
+ LOCK_PROCESS;
+ t->te_next = freeTimerRecs;
+ freeTimerRecs = t;
+ UNLOCK_PROCESS;
+ UNLOCK_APP(app);
+}
+
+XtWorkProcId XtAddWorkProc(
+ XtWorkProc proc,
+ XtPointer closure)
+{
+ return XtAppAddWorkProc(_XtDefaultAppContext(), proc, closure);
+}
+
+XtWorkProcId XtAppAddWorkProc(
+ XtAppContext app,
+ XtWorkProc proc,
+ XtPointer closure)
+{
+ WorkProcRec *wptr;
+
+ LOCK_APP(app);
+ LOCK_PROCESS;
+ if (freeWorkRecs) {
+ wptr = freeWorkRecs;
+ freeWorkRecs = wptr->next;
+ } else wptr = XtNew(WorkProcRec);
+ UNLOCK_PROCESS;
+ wptr->next = app->workQueue;
+ wptr->closure = closure;
+ wptr->proc = proc;
+ wptr->app = app;
+ app->workQueue = wptr;
+ UNLOCK_APP(app);
+ return (XtWorkProcId) wptr;
+}
+
+void XtRemoveWorkProc(
+ XtWorkProcId id)
+{
+ WorkProcRec *wid= (WorkProcRec *) id, *w, *last;
+ XtAppContext app = wid->app;
+
+ LOCK_APP(app);
+ /* find it */
+ for(w = app->workQueue, last = NULL;
+ w != NULL && w != wid; w = w->next) last = w;
+
+ if (w == NULL) {
+ UNLOCK_APP(app);
+ return; /* couldn't find it */
+ }
+
+ if(last == NULL) app->workQueue = w->next;
+ else last->next = w->next;
+ LOCK_PROCESS;
+ w->next = freeWorkRecs;
+ freeWorkRecs = w;
+ UNLOCK_PROCESS;
+ UNLOCK_APP(app);
+}
+
+XtSignalId XtAddSignal(
+ XtSignalCallbackProc proc,
+ XtPointer closure)
+{
+ return XtAppAddSignal(_XtDefaultAppContext(), proc, closure);
+}
+
+XtSignalId XtAppAddSignal(
+ XtAppContext app,
+ XtSignalCallbackProc proc,
+ XtPointer closure)
+{
+ SignalEventRec *sptr;
+
+ LOCK_APP(app);
+ LOCK_PROCESS;
+ if (freeSignalRecs) {
+ sptr = freeSignalRecs;
+ freeSignalRecs = sptr->se_next;
+ } else
+ sptr = XtNew(SignalEventRec);
+ UNLOCK_PROCESS;
+ sptr->se_next = app->signalQueue;
+ sptr->se_closure = closure;
+ sptr->se_proc = proc;
+ sptr->app = app;
+ sptr->se_notice = FALSE;
+ app->signalQueue = sptr;
+ UNLOCK_APP(app);
+ return (XtSignalId) sptr;
+}
+
+void XtRemoveSignal(
+ XtSignalId id)
+{
+ SignalEventRec *sid = (SignalEventRec*) id, *s, *last = NULL;
+ XtAppContext app = sid->app;
+
+ LOCK_APP(app);
+ for (s = app->signalQueue; s != NULL && s != sid; s = s->se_next)
+ last = s;
+ if (s == NULL) {
+ UNLOCK_APP(app);
+ return;
+ }
+ if (last == NULL)
+ app->signalQueue = s->se_next;
+ else
+ last->se_next = s->se_next;
+ LOCK_PROCESS;
+ s->se_next = freeSignalRecs;
+ freeSignalRecs = s;
+ UNLOCK_PROCESS;
+ UNLOCK_APP(app);
+}
+
+void XtNoticeSignal(
+ XtSignalId id)
+{
+ /*
+ * It would be overkill to lock the app to set this flag.
+ * In the worst case, 2..n threads would be modifying this
+ * flag. The last one wins. Since signals occur asynchronously
+ * anyway, this can occur with or without threads.
+ *
+ * The other issue is that thread t1 sets the flag in a
+ * signalrec that has been deleted in thread t2. We rely
+ * on a detail of the implementation, i.e. free'd signalrecs
+ * aren't really free'd, they're just moved to a list of
+ * free recs, so deref'ing one won't hurt anything.
+ *
+ * Lastly, and perhaps most importantly, since POSIX threads
+ * says that the handling of asynchronous signals in a synchronous
+ * threads environment is undefined. Therefor it would be an
+ * error for both signals and threads to be in use in the same
+ * program.
+ */
+ SignalEventRec *sid = (SignalEventRec*) id;
+ sid->se_notice = TRUE;
+}
+
+XtInputId XtAddInput(
+ int source,
+ XtPointer Condition,
+ XtInputCallbackProc proc,
+ XtPointer closure)
+{
+ return XtAppAddInput(_XtDefaultAppContext(),
+ source, Condition, proc, closure);
+}
+
+XtInputId XtAppAddInput(
+ XtAppContext app,
+ int source,
+ XtPointer Condition,
+ XtInputCallbackProc proc,
+ XtPointer closure)
+{
+ InputEvent* sptr;
+ XtInputMask condition = (XtInputMask) Condition;
+
+ LOCK_APP(app);
+ if (!condition ||
+ condition & ~(XtInputReadMask|XtInputWriteMask|XtInputExceptMask))
+ XtAppErrorMsg(app,"invalidParameter","xtAddInput",XtCXtToolkitError,
+ "invalid condition passed to XtAppAddInput",
+ (String *)NULL, (Cardinal *)NULL);
+
+ if (app->input_max <= source) {
+ Cardinal n = source + 1;
+ int ii;
+ app->input_list = (InputEvent**)XtRealloc((char*) app->input_list,
+ n * sizeof(InputEvent*));
+ for (ii = app->input_max; ii < (int) n; ii++)
+ app->input_list[ii] = (InputEvent*) NULL;
+ app->input_max = n;
+ }
+ sptr = XtNew(InputEvent);
+ sptr->ie_proc = proc;
+ sptr->ie_closure = closure;
+ sptr->app = app;
+ sptr->ie_oq = NULL;
+ sptr->ie_source = source;
+ sptr->ie_condition = condition;
+ sptr->ie_next = app->input_list[source];
+ app->input_list[source] = sptr;
+
+#ifndef USE_POLL
+ if (condition & XtInputReadMask) FD_SET(source, &app->fds.rmask);
+ if (condition & XtInputWriteMask) FD_SET(source, &app->fds.wmask);
+ if (condition & XtInputExceptMask) FD_SET(source, &app->fds.emask);
+
+ if (app->fds.nfds < (source+1)) app->fds.nfds = source+1;
+#else
+ if (sptr->ie_next == NULL)
+ app->fds.nfds++;
+#endif
+ app->input_count++;
+ app->rebuild_fdlist = TRUE;
+ UNLOCK_APP(app);
+ return((XtInputId)sptr);
+}
+
+void XtRemoveInput(
+ register XtInputId id)
+{
+ register InputEvent *sptr, *lptr;
+ XtAppContext app = ((InputEvent *)id)->app;
+ register int source = ((InputEvent *)id)->ie_source;
+ Boolean found = False;
+
+ LOCK_APP(app);
+ sptr = app->outstandingQueue;
+ lptr = NULL;
+ for (; sptr != NULL; sptr = sptr->ie_oq) {
+ if (sptr == (InputEvent *)id) {
+ if (lptr == NULL) app->outstandingQueue = sptr->ie_oq;
+ else lptr->ie_oq = sptr->ie_oq;
+ }
+ lptr = sptr;
+ }
+
+ if(app->input_list && (sptr = app->input_list[source]) != NULL) {
+ for( lptr = NULL ; sptr; sptr = sptr->ie_next ){
+ if(sptr == (InputEvent *) id) {
+#ifndef USE_POLL
+ XtInputMask condition = 0;
+#endif
+ if(lptr == NULL) {
+ app->input_list[source] = sptr->ie_next;
+ } else {
+ lptr->ie_next = sptr->ie_next;
+ }
+#ifndef USE_POLL
+ for (lptr = app->input_list[source];
+ lptr; lptr = lptr->ie_next)
+ condition |= lptr->ie_condition;
+ if ((sptr->ie_condition & XtInputReadMask) &&
+ !(condition & XtInputReadMask))
+ FD_CLR(source, &app->fds.rmask);
+ if ((sptr->ie_condition & XtInputWriteMask) &&
+ !(condition & XtInputWriteMask))
+ FD_CLR(source, &app->fds.wmask);
+ if ((sptr->ie_condition & XtInputExceptMask) &&
+ !(condition & XtInputExceptMask))
+ FD_CLR(source, &app->fds.emask);
+#endif
+ XtFree((char *) sptr);
+ found = True;
+ break;
+ }
+ lptr = sptr;
+ }
+ }
+
+ if (found) {
+ app->input_count--;
+#ifdef USE_POLL
+ if (app->input_list[source] == NULL)
+ app->fds.nfds--;
+#endif
+ app->rebuild_fdlist = TRUE;
+ } else
+ XtAppWarningMsg(app, "invalidProcedure","inputHandler",
+ XtCXtToolkitError,
+ "XtRemoveInput: Input handler not found",
+ (String *)NULL, (Cardinal *)NULL);
+ UNLOCK_APP(app);
+}
+
+void _XtRemoveAllInputs(
+ XtAppContext app)
+{
+ int i;
+ for (i = 0; i < app->input_max; i++) {
+ InputEvent* ep = app->input_list[i];
+ while (ep) {
+ InputEvent *next = ep->ie_next;
+ XtFree( (char*)ep );
+ ep = next;
+ }
+ }
+ XtFree((char *) app->input_list);
+}
+
+/* Do alternate input and timer callbacks if there are any */
+
+static void DoOtherSources(
+ XtAppContext app)
+{
+ TimerEventRec *te_ptr;
+ InputEvent *ie_ptr;
+ struct timeval cur_time;
+
+#define DrainQueue() \
+ for (ie_ptr = app->outstandingQueue; ie_ptr != NULL;) { \
+ app->outstandingQueue = ie_ptr->ie_oq; \
+ ie_ptr ->ie_oq = NULL; \
+ IeCallProc(ie_ptr); \
+ ie_ptr = app->outstandingQueue; \
+ }
+/*enddef*/
+ DrainQueue();
+ if (app->input_count > 0) {
+ /* Call _XtWaitForSomething to get input queued up */
+ (void) _XtWaitForSomething (app,
+ TRUE, TRUE, FALSE, TRUE,
+ FALSE,
+#ifdef XTHREADS
+ TRUE,
+#endif
+ (unsigned long *)NULL);
+ DrainQueue();
+ }
+ if (app->timerQueue != NULL) { /* check timeout queue */
+ X_GETTIMEOFDAY (&cur_time);
+ FIXUP_TIMEVAL(cur_time);
+ while(IS_AT_OR_AFTER (app->timerQueue->te_timer_value, cur_time)) {
+ te_ptr = app->timerQueue;
+ app->timerQueue = te_ptr->te_next;
+ te_ptr->te_next = NULL;
+ if (te_ptr->te_proc != NULL)
+ TeCallProc(te_ptr);
+ LOCK_PROCESS;
+ te_ptr->te_next = freeTimerRecs;
+ freeTimerRecs = te_ptr;
+ UNLOCK_PROCESS;
+ if (app->timerQueue == NULL) break;
+ }
+ }
+ if (app->signalQueue != NULL) {
+ SignalEventRec *se_ptr = app->signalQueue;
+ while (se_ptr != NULL) {
+ if (se_ptr->se_notice) {
+ se_ptr->se_notice = FALSE;
+ if (se_ptr->se_proc != NULL)
+ SeCallProc(se_ptr);
+ }
+ se_ptr = se_ptr->se_next;
+ }
+ }
+#undef DrainQueue
+}
+
+/* If there are any work procs, call them. Return whether we did so */
+
+static Boolean CallWorkProc(
+ XtAppContext app)
+{
+ register WorkProcRec *w = app->workQueue;
+ Boolean delete;
+
+ if (w == NULL) return FALSE;
+
+ app->workQueue = w->next;
+
+ delete = (*(w->proc)) (w->closure);
+
+ if (delete) {
+ LOCK_PROCESS;
+ w->next = freeWorkRecs;
+ freeWorkRecs = w;
+ UNLOCK_PROCESS;
+ }
+ else {
+ w->next = app->workQueue;
+ app->workQueue = w;
+ }
+ return TRUE;
+}
+
+/*
+ * XtNextEvent()
+ * return next event;
+ */
+
+void XtNextEvent(
+ XEvent *event)
+{
+ XtAppNextEvent(_XtDefaultAppContext(), event);
+}
+
+void _XtRefreshMapping(
+ XEvent* event,
+ _XtBoolean dispatch)
+{
+ XtPerDisplay pd;
+
+ LOCK_PROCESS;
+ pd = _XtGetPerDisplay(event->xmapping.display);
+ if (event->xmapping.request != MappingPointer &&
+ pd && pd->keysyms && (event->xmapping.serial >= pd->keysyms_serial))
+ _XtBuildKeysymTables( event->xmapping.display, pd );
+ XRefreshKeyboardMapping(&event->xmapping);
+ if (dispatch && pd && pd->mapping_callbacks)
+ XtCallCallbackList((Widget) NULL,
+ (XtCallbackList)pd->mapping_callbacks,
+ (XtPointer)event );
+ UNLOCK_PROCESS;
+}
+
+void XtAppNextEvent(
+ XtAppContext app,
+ XEvent *event)
+{
+ int i, d;
+
+ LOCK_APP(app);
+ for (;;) {
+ if (app->count == 0)
+ DoOtherSources(app);
+ else {
+ for (i = 1; i <= app->count; i++) {
+ d = (i + app->last) % app->count;
+ if (d == 0) DoOtherSources(app);
+ if (XEventsQueued(app->list[d], QueuedAfterReading))
+ goto GotEvent;
+ }
+ for (i = 1; i <= app->count; i++) {
+ d = (i + app->last) % app->count;
+ if (XEventsQueued(app->list[d], QueuedAfterFlush))
+ goto GotEvent;
+ }
+ }
+
+ /* We're ready to wait...if there is a work proc, call it */
+ if (CallWorkProc(app)) continue;
+
+ d = _XtWaitForSomething (app,
+ FALSE, FALSE, FALSE, FALSE,
+ TRUE,
+#ifdef XTHREADS
+ TRUE,
+#endif
+ (unsigned long *) NULL);
+
+ if (d != -1) {
+ GotEvent:
+ XNextEvent (app->list[d], event);
+#ifdef XTHREADS
+ /* assert(app->list[d] == event->xany.display); */
+#endif
+ app->last = d;
+ if (event->xany.type == MappingNotify)
+ _XtRefreshMapping(event, False);
+ UNLOCK_APP(app);
+ return;
+ }
+
+ } /* for */
+}
+
+void XtProcessEvent(
+ XtInputMask mask)
+{
+ XtAppProcessEvent(_XtDefaultAppContext(), mask);
+}
+
+void XtAppProcessEvent(
+ XtAppContext app,
+ XtInputMask mask)
+{
+ int i, d;
+ XEvent event;
+ struct timeval cur_time;
+
+ LOCK_APP(app);
+ if (mask == 0) {
+ UNLOCK_APP(app);
+ return;
+ }
+
+ for (;;) {
+
+ if (mask & XtIMSignal && app->signalQueue != NULL) {
+ SignalEventRec *se_ptr = app->signalQueue;
+ while (se_ptr != NULL) {
+ if (se_ptr->se_notice) {
+ se_ptr->se_notice = FALSE;
+ SeCallProc(se_ptr);
+ UNLOCK_APP(app);
+ return;
+ }
+ se_ptr = se_ptr->se_next;
+ }
+ }
+
+ if (mask & XtIMTimer && app->timerQueue != NULL) {
+ X_GETTIMEOFDAY (&cur_time);
+ FIXUP_TIMEVAL(cur_time);
+ if (IS_AT_OR_AFTER(app->timerQueue->te_timer_value, cur_time)){
+ TimerEventRec *te_ptr = app->timerQueue;
+ app->timerQueue = app->timerQueue->te_next;
+ te_ptr->te_next = NULL;
+ if (te_ptr->te_proc != NULL)
+ TeCallProc(te_ptr);
+ LOCK_PROCESS;
+ te_ptr->te_next = freeTimerRecs;
+ freeTimerRecs = te_ptr;
+ UNLOCK_PROCESS;
+ UNLOCK_APP(app);
+ return;
+ }
+ }
+
+ if (mask & XtIMAlternateInput) {
+ if (app->input_count > 0 && app->outstandingQueue == NULL) {
+ /* Call _XtWaitForSomething to get input queued up */
+ (void) _XtWaitForSomething (app,
+ TRUE, TRUE, FALSE, TRUE,
+ FALSE,
+#ifdef XTHREADS
+ TRUE,
+#endif
+ (unsigned long *)NULL);
+ }
+ if (app->outstandingQueue != NULL) {
+ InputEvent *ie_ptr = app->outstandingQueue;
+ app->outstandingQueue = ie_ptr->ie_oq;
+ ie_ptr->ie_oq = NULL;
+ IeCallProc(ie_ptr);
+ UNLOCK_APP(app);
+ return;
+ }
+ }
+
+ if (mask & XtIMXEvent) {
+ for (i = 1; i <= app->count; i++) {
+ d = (i + app->last) % app->count;
+ if (XEventsQueued(app->list[d], QueuedAfterReading))
+ goto GotEvent;
+ }
+ for (i = 1; i <= app->count; i++) {
+ d = (i + app->last) % app->count;
+ if (XEventsQueued(app->list[d], QueuedAfterFlush))
+ goto GotEvent;
+ }
+ }
+
+ /* Nothing to do...wait for something */
+
+ if (CallWorkProc(app)) continue;
+
+ d = _XtWaitForSomething (app,
+ (mask & XtIMXEvent ? FALSE : TRUE),
+ (mask & XtIMTimer ? FALSE : TRUE),
+ (mask & XtIMAlternateInput ? FALSE : TRUE),
+ (mask & XtIMSignal ? FALSE : TRUE),
+ TRUE,
+#ifdef XTHREADS
+ TRUE,
+#endif
+ (unsigned long *) NULL);
+
+ if (mask & XtIMXEvent && d != -1) {
+ GotEvent:
+ XNextEvent(app->list[d], &event);
+#ifdef XTHREADS
+ /* assert(app->list[d] == event.xany.display); */
+#endif
+ app->last = d;
+ if (event.xany.type == MappingNotify) {
+ _XtRefreshMapping(&event, False);
+ }
+ XtDispatchEvent(&event);
+ UNLOCK_APP(app);
+ return;
+ }
+
+ }
+}
+
+Boolean XtPending(void)
+{
+ return (XtAppPending(_XtDefaultAppContext()) != 0);
+}
+
+XtInputMask XtAppPending(
+ XtAppContext app)
+{
+ struct timeval cur_time;
+ int d;
+ XtInputMask ret = 0;
+
+/*
+ * Check for pending X events
+ */
+ LOCK_APP(app);
+ for (d = 0; d < app->count; d++) {
+ if (XEventsQueued(app->list[d], QueuedAfterReading)) {
+ ret = XtIMXEvent;
+ break;
+ }
+ }
+ if (ret == 0) {
+ for (d = 0; d < app->count; d++) {
+ if (XEventsQueued(app->list[d], QueuedAfterFlush)) {
+ ret = XtIMXEvent;
+ break;
+ }
+ }
+ }
+
+ if (app->signalQueue != NULL) {
+ SignalEventRec *se_ptr = app->signalQueue;
+ while (se_ptr != NULL) {
+ if (se_ptr->se_notice) {
+ ret |= XtIMSignal;
+ break;
+ }
+ se_ptr = se_ptr->se_next;
+ }
+ }
+
+/*
+ * Check for pending alternate input
+ */
+ if (app->timerQueue != NULL) { /* check timeout queue */
+ X_GETTIMEOFDAY (&cur_time);
+ FIXUP_TIMEVAL(cur_time);
+ if ((IS_AT_OR_AFTER(app->timerQueue->te_timer_value, cur_time)) &&
+ (app->timerQueue->te_proc != NULL)) {
+ ret |= XtIMTimer;
+ }
+ }
+
+ if (app->outstandingQueue != NULL) ret |= XtIMAlternateInput;
+ else {
+ /* This won't cause a wait, but will enqueue any input */
+
+ if(_XtWaitForSomething (app,
+ FALSE, TRUE, FALSE, TRUE,
+ FALSE,
+#ifdef XTHREADS
+ TRUE,
+#endif
+ (unsigned long *) NULL) != -1)
+ ret |= XtIMXEvent;
+ if (app->outstandingQueue != NULL) ret |= XtIMAlternateInput;
+ }
+ UNLOCK_APP(app);
+ return ret;
+}
+
+/* Peek at alternate input and timer callbacks if there are any */
+
+static Boolean PeekOtherSources(
+ XtAppContext app)
+{
+ struct timeval cur_time;
+
+ if (app->outstandingQueue != NULL) return TRUE;
+
+ if (app->signalQueue != NULL) {
+ SignalEventRec *se_ptr = app->signalQueue;
+ while (se_ptr != NULL) {
+ if (se_ptr->se_notice)
+ return TRUE;
+ se_ptr = se_ptr->se_next;
+ }
+ }
+
+ if (app->input_count > 0) {
+ /* Call _XtWaitForSomething to get input queued up */
+ (void) _XtWaitForSomething (app,
+ TRUE, TRUE, FALSE, TRUE,
+ FALSE,
+#ifdef XTHREADS
+ TRUE,
+#endif
+ (unsigned long *)NULL);
+ if (app->outstandingQueue != NULL) return TRUE;
+ }
+
+ if (app->timerQueue != NULL) { /* check timeout queue */
+ X_GETTIMEOFDAY (&cur_time);
+ FIXUP_TIMEVAL(cur_time);
+ if (IS_AT_OR_AFTER (app->timerQueue->te_timer_value, cur_time))
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+Boolean XtPeekEvent(
+ XEvent *event)
+{
+ return XtAppPeekEvent(_XtDefaultAppContext(), event);
+}
+
+Boolean XtAppPeekEvent_SkipTimer;
+
+Boolean XtAppPeekEvent(
+ XtAppContext app,
+ XEvent *event)
+{
+ int i, d;
+ Boolean foundCall = FALSE;
+
+ LOCK_APP(app);
+ for (i = 1; i <= app->count; i++) {
+ d = (i + app->last) % app->count;
+ if (d == 0) foundCall = PeekOtherSources(app);
+ if (XEventsQueued(app->list[d], QueuedAfterReading))
+ goto GotEvent;
+ }
+ for (i = 1; i <= app->count; i++) {
+ d = (i + app->last) % app->count;
+ if (XEventsQueued(app->list[d], QueuedAfterFlush))
+ goto GotEvent;
+ }
+
+ if (foundCall) {
+ event->xany.type = 0;
+ event->xany.display = NULL;
+ event->xany.window = 0;
+ UNLOCK_APP(app);
+ return FALSE;
+ }
+
+ while (1) {
+ d = _XtWaitForSomething (app,
+ FALSE, FALSE, FALSE, FALSE,
+ TRUE,
+#ifdef XTHREADS
+ TRUE,
+#endif
+ (unsigned long *) NULL);
+
+ if (d != -1) { /* event */
+ GotEvent:
+ XPeekEvent(app->list[d], event);
+ app->last = (d == 0 ? app->count : d) - 1;
+ UNLOCK_APP(app);
+ return TRUE;
+ }
+ else { /* input or timer or signal */
+ /*
+ * Check to see why a -1 was returned, if a timer expired,
+ * call it and block some more
+ */
+ if ((app->timerQueue != NULL) && ! XtAppPeekEvent_SkipTimer) { /* timer */
+ struct timeval cur_time;
+ Bool did_timer = False;
+
+ X_GETTIMEOFDAY (&cur_time);
+ FIXUP_TIMEVAL(cur_time);
+ while (IS_AT_OR_AFTER(app->timerQueue->te_timer_value, cur_time)) {
+ TimerEventRec *te_ptr = app->timerQueue;
+ app->timerQueue = app->timerQueue->te_next;
+ te_ptr->te_next = NULL;
+ if (te_ptr->te_proc != NULL) {
+ TeCallProc(te_ptr);
+ did_timer = True;
+ }
+ LOCK_PROCESS;
+ te_ptr->te_next = freeTimerRecs;
+ freeTimerRecs = te_ptr;
+ UNLOCK_PROCESS;
+ if (app->timerQueue == NULL) break;
+ }
+ if (did_timer)
+ {
+ for (d = 0; d < app->count; d++)
+ /* the timer's procedure may have caused an event */
+ if (XEventsQueued(app->list[d], QueuedAfterFlush)) {
+ goto GotEvent;
+ }
+ continue; /* keep blocking */
+ }
+ }
+ /*
+ * spec is vague here; we'll assume signals also return FALSE,
+ * of course to determine whether a signal is pending requires
+ * walking the signalQueue looking for se_notice flags which
+ * this code doesn't do.
+ */
+#if 0
+ if (app->signalQueue != NULL) { /* signal */
+ event->xany.type = 0;
+ event->xany.display = NULL;
+ event->xany.window = 0;
+ UNLOCK_APP(app);
+ return FALSE;
+ }
+ else
+#endif
+ { /* input */
+ event->xany.type = 0;
+ event->xany.display = NULL;
+ event->xany.window = 0;
+ UNLOCK_APP(app);
+ return FALSE;
+ }
+ }
+ } /* end while */
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 20:03:29 +0000