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hw/xwin: Process one Windows message per wakeup, rather than all of them. 

De-queuing Windows messages and X events happens in the same thread of
execution.  Draining the windows message queue can lead to the X event queue
overflowing if lots of those windows messages cause X events (e.g. if a keyboard
macro program has just dumped thousands of keypresses into the Windows message
queue).  See the mailing list thread [1] for more details.

Processing one Windows message per wakeup, rather than all of them gives the X
server a chance to do stuff as well after each message.

[1] http://cygwin.com/ml/cygwin-xfree/2010-01/msg00056.html

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Reviewed-by: Colin Harrison <colin.harrison@virgin.net>
This commit is contained in:
Jon TURNEY 2010-02-23 13:38:48 +00:00
parent e30e1ea987
commit f57100bb36
2 changed files with 18 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
hw/xwin/winblock.c
View File

@ -42,14 +42,26 @@ winBlockHandler(ScreenPtr pScreen,
#if defined(XWIN_CLIPBOARD) || defined(XWIN_MULTIWINDOW)
winScreenPriv(pScreen);
#endif
MSG msg;
#ifndef HAS_DEVWINDOWS
struct timeval **tvp = pTimeout;
if (*tvp != NULL) {
if (GetQueueStatus(QS_ALLINPUT | QS_ALLPOSTMESSAGE) != 0) {
/* If there are still messages to process on the Windows message
queue, make sure select() just polls rather than blocking.
*/
(*tvp)->tv_sec = 0;
(*tvp)->tv_usec = 0;
}
else {
/* Otherwise, lacking /dev/windows, we must wake up again in
a reasonable time to check the Windows message queue. without
noticeable delay.
*/
(*tvp)->tv_sec = 0;
(*tvp)->tv_usec = 100;
}
}
#endif
@ -68,25 +80,13 @@ winBlockHandler(ScreenPtr pScreen,
if (iReturn != 0) {
ErrorF("winBlockHandler - pthread_mutex_unlock () failed: %d\n",
iReturn);
goto winBlockHandler_ProcessMessages;
}
winDebug("winBlockHandler - pthread_mutex_unlock () returned\n");
else {
winDebug("winBlockHandler - pthread_mutex_unlock () returned\n");
}
}
winBlockHandler_ProcessMessages:
#endif
/* Process all messages on our queue */
while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
if ((g_hDlgDepthChange == 0
|| !IsDialogMessage(g_hDlgDepthChange, &msg))
&& (g_hDlgExit == 0 || !IsDialogMessage(g_hDlgExit, &msg))
&& (g_hDlgAbout == 0 || !IsDialogMessage(g_hDlgAbout, &msg))) {
DispatchMessage(&msg);
}
}
/*
At least one X client has asked to suspend the screensaver, so
reset Windows' display idle timer

4
hw/xwin/winwakeup.c
View File

@ -43,8 +43,8 @@ winWakeupHandler(ScreenPtr pScreen,
{
MSG msg;
/* Process all messages on our queue */
while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
/* Process one message from our queue */
if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
if ((g_hDlgDepthChange == 0
|| !IsDialogMessage(g_hDlgDepthChange, &msg))
&& (g_hDlgExit == 0 || !IsDialogMessage(g_hDlgExit, &msg))