R6.6 is the Xorg base-lineXORG-MAIN

1 files changed, 1643 insertions, 0 deletions

diff --git a/src/NextEvent.c b/src/NextEvent.c
new file mode 100644
index 0000000..0e6c45f
--- /dev/null
+++ b/src/NextEvent.c
@@ -0,0 +1,1643 @@
+/* $Xorg: NextEvent.c,v 1.11 2001/03/19 14:27:27 coskrey 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  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.
+
+*/
+
+#include "IntrinsicI.h"
+#include <stdio.h>
+#include <errno.h>
+#ifdef X_NOT_STDC_ENV
+extern int errno;
+#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(sco324) || (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 (howlong, start_time)
+	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 <= (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 = { 0 };
+#else
+#define X_BLOCK -1
+#define X_DONT_BLOCK 0
+#endif
+
+static void InitTimes (block, howlong, wt)
+    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 (app, ignoreEvents, ignoreInputs, wf)
+    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 (app, block, howlong, ignoreTimers, wt)
+    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 (wt, wf)
+    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 (app, wf, nfds, ignoreEvents, ignoreInputs, dpy_no, found_input)
+    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) {
+		    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) {
+			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.
+ */
+#if NeedFunctionPrototypes
+int _XtWaitForSomething(
+    XtAppContext app,
+    _XtBoolean ignoreEvents,
+    _XtBoolean ignoreTimers,
+    _XtBoolean ignoreInputs,
+    _XtBoolean ignoreSignals,
+    _XtBoolean block,
+#ifdef XTHREADS
+    _XtBoolean drop_lock,
+#endif
+    unsigned long *howlong)
+#else
+int _XtWaitForSomething(app,
+			ignoreEvents, ignoreTimers, ignoreInputs, ignoreSignals,
+			block, 
+#ifdef XTHREADS
+			drop_lock, 
+#endif
+			howlong)
+    XtAppContext app;
+    Boolean ignoreEvents;
+    Boolean ignoreTimers;
+    Boolean ignoreInputs;
+    Boolean ignoreSignals;
+    Boolean block;
+#ifdef XTHREADS
+    Boolean drop_lock;
+#endif
+    unsigned long *howlong;
+#endif
+{
+    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;
+#endif
+
+    app->rebuild_fdlist = TRUE;
+
+    while (1) {
+WaitLoop:
+	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(interval, proc, closure)
+	unsigned long interval;
+	XtTimerCallbackProc proc;
+	XtPointer closure;
+{
+	return XtAppAddTimeOut(_XtDefaultAppContext(), 
+		interval, proc, closure); 
+}
+
+static void QueueTimerEvent(app, ptr)
+    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(app, interval, proc, closure)
+	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(id)
+	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(proc, closure)
+	XtWorkProc proc;
+	XtPointer closure;
+{
+	return XtAppAddWorkProc(_XtDefaultAppContext(), proc, closure);
+}
+
+XtWorkProcId XtAppAddWorkProc(app, proc, closure)
+	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(id)
+	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(proc, closure)
+	XtSignalCallbackProc proc;
+	XtPointer closure;
+{
+	return XtAppAddSignal(_XtDefaultAppContext(), proc, closure);
+}
+
+XtSignalId XtAppAddSignal(app, proc, closure)
+	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(id)
+	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(id)
+	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( source, Condition, proc, closure)
+	int source;
+	XtPointer Condition;
+	XtInputCallbackProc proc;
+	XtPointer closure;
+{
+	return XtAppAddInput(_XtDefaultAppContext(),
+		source, Condition, proc, closure);
+}
+
+XtInputId XtAppAddInput(app, source, Condition, proc, closure)
+	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( id )
+	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--;
+	    if (app->input_list[source] == NULL)
+
+#ifdef USE_POLL
+
+		app->fds.nfds--;
+
+#else
+
+	    {
+		int display;
+		int source;
+
+		/*
+		 * Search through list[] for largest connection number
+		 */
+
+		app->fds.nfds = 0;
+
+		for (display = 0; display < app->count; display++) {
+		    if ((ConnectionNumber(app->list[display]) + 1) > app->fds.nfds) {
+ 			app->fds.nfds = ConnectionNumber(app->list[display]) + 1;
+		    }
+		}
+
+		/*
+		 * Search through input_list[] for largest input source, i.e.
+		 * file descriptor
+		 */
+
+		for (source = (app->input_max - 1); ((source >= 0) && ((source +1) > app->fds.nfds)); source--) {
+		    if (app->input_list[source] != (InputEvent *) NULL) {
+			app->fds.nfds = (source + 1);
+			break;
+		    }
+		}
+	    }
+
+#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(app)
+    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(app)
+	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(app)
+	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(event)
+	XEvent *event;
+{
+	XtAppNextEvent(_XtDefaultAppContext(), event);
+}
+
+#if NeedFunctionPrototypes
+void _XtRefreshMapping(
+    XEvent* event,
+    _XtBoolean dispatch)
+#else
+void _XtRefreshMapping(event, dispatch)
+    XEvent *event;
+    Boolean dispatch;
+#endif
+{
+    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(app, event)
+	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(mask)
+	XtInputMask mask;
+{
+	XtAppProcessEvent(_XtDefaultAppContext(), mask);
+}
+
+void XtAppProcessEvent(app, mask)
+	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()
+{
+	return (XtAppPending(_XtDefaultAppContext()) != 0);
+}
+
+XtInputMask XtAppPending(app)
+	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 != 0)) {
+		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(app)
+	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(event)
+	XEvent *event;
+{
+	return XtAppPeekEvent(_XtDefaultAppContext(), event);
+}
+
+Boolean XtAppPeekEvent(app, event)
+	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) {  /* 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);
+					LOCK_PROCESS;
+					did_timer = True;
+					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 */
+				}
+			}
+			if (app->signalQueue != NULL) {  /* signal */
+			/* spec is vague here; we'll assume signals also return FALSE */
+				event->xany.type = 0;
+				event->xany.display = NULL;
+				event->xany.window = 0;
+				UNLOCK_APP(app);
+				return FALSE;
+			}
+			else {  /* input */
+				event->xany.type = 0;   
+				event->xany.display = NULL;
+				event->xany.window = 0;
+				UNLOCK_APP(app);
+				return FALSE;
+			}
+		}
+	} /* end while */
+}