64f077bf7b
connected, this was introduced with the xcb fix and would result in the server eating 100% cpu while waiting for clients bump PKGNAME ok dim@ (maintainer)
72 lines
2.5 KiB
Plaintext
72 lines
2.5 KiB
Plaintext
$OpenBSD: patch-lib_platform_CXWindowsEventQueueBuffer_cpp,v 1.2 2009/12/23 09:08:44 sturm Exp $
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--- lib/platform/CXWindowsEventQueueBuffer.cpp.orig Sun Apr 24 05:02:16 2005
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+++ lib/platform/CXWindowsEventQueueBuffer.cpp Mon Dec 21 22:26:21 2009
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@@ -84,6 +84,8 @@ CXWindowsEventQueueBuffer::waitForEvent(double dtimeou
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pfds[0].events = POLLIN;
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int timeout = (dtimeout < 0.0) ? -1 :
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static_cast<int>(1000.0 * dtimeout);
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+ int remaining = timeout;
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+ int retval = 0;
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#else
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struct timeval timeout;
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struct timeval* timeoutPtr;
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@@ -102,19 +104,43 @@ CXWindowsEventQueueBuffer::waitForEvent(double dtimeou
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FD_ZERO(&rfds);
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FD_SET(ConnectionNumber(m_display), &rfds);
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#endif
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+ // It's possible that the X server has queued events locally
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+ // in xlib's event buffer and not pushed on to the fd. Hence we
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+ // can't simply monitor the fd as we may never be woken up.
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+ // ie addEvent calls flush, XFlush may not send via the fd hence
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+ // there is an event waiting to be sent but we must exit the poll
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+ // before it can.
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+ // Instead we poll for a brief period of time (so if events
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+ // queued locally in the xlib buffer can be processed)
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+ // and continue doing this until timeout is reached.
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+ // The human eye can notice 60hz (ansi) which is 16ms, however
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+ // we want to give the cpu a chance s owe up this to 25ms
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+#define TIMEOUT_DELAY 25
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- // wait for message from X server or for timeout. also check
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- // if the thread has been cancelled. poll() should return -1
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- // with EINTR when the thread is cancelled.
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+ if (timeout == -1) {
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#if HAVE_POLL
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- poll(pfds, 1, timeout);
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+ poll(pfds, 1, timeout);
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#else
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- select(ConnectionNumber(m_display) + 1,
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+ select(ConnectionNumber(m_display) + 1,
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+ SELECT_TYPE_ARG234 &rfds,
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+ SELECT_TYPE_ARG234 NULL,
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+ SELECT_TYPE_ARG234 NULL,
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+ SELECT_TYPE_ARG5 timeoutPtr);
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+#endif
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+ } else {
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+ while( remaining > 0 && QLength(m_display)==0 && retval==0){
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+#if HAVE_POLL
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+ retval = poll(pfds, 1, TIMEOUT_DELAY); //16ms = 60hz, but we make it > to play nicely with the cpu
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+#else
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+ retval = select(ConnectionNumber(m_display) + 1,
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SELECT_TYPE_ARG234 &rfds,
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SELECT_TYPE_ARG234 NULL,
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SELECT_TYPE_ARG234 NULL,
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- SELECT_TYPE_ARG5 timeoutPtr);
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+ SELECT_TYPE_ARG5 TIMEOUT_DELAY);
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#endif
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+ remaining-=TIMEOUT_DELAY;
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+ }
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+ }
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{
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// we're no longer waiting for events
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@@ -179,7 +205,7 @@ bool
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CXWindowsEventQueueBuffer::isEmpty() const
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{
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CLock lock(&m_mutex);
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- return (XPending(m_display) == 0);
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+ return (QLength(m_display) == 0 );
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}
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CEventQueueTimer*
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