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QWaylandDisplay: fix data race on m_quitting

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WARNING: ThreadSanitizer: data race (pid=247514)
   Write of size 1 at 0x7214000026f5 by main thread (mutexes: write M0):
     #0 QtWaylandClient::EventThread::stop() (libQt6WaylandClient_tsan.so.6+0xbb696)

   Previous read of size 1 at 0x7214000026f5 by thread T3:
     #0 QtWaylandClient::EventThread::waitForReading() (libQt6WaylandClient_tsan.so.6+0xbbbf9)
     #1 QtWaylandClient::EventThread::run() (libQt6WaylandClient_tsan.so.6+0xbba27)

Pick-to: 6.9 6.8
Change-Id: I4a5dc95668619d337181e6c5055cc94bbc5fc7ae
Reviewed-by: David Edmundson <davidedmundson@kde.org>
This commit is contained in:
David Faure 2025-03-09 13:04:39 +01:00
parent 9155b2ecb4
commit 7d77e1d9f8
1 changed files with 7 additions and 10 deletions
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17
src/plugins/platforms/wayland/qwaylanddisplay.cpp
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@ -106,13 +106,13 @@ public:
* not only the one issued from event thread's waitForReading(), which means functions
* called from dispatch_pending() can safely spin an event loop.
*/
if (m_quitting)
if (m_quitting.loadRelaxed())
return;
for (;;) {
if (dispatchQueuePending() < 0) {
Q_EMIT waylandError();
m_quitting = true;
m_quitting.storeRelaxed(true);
return;
}
@ -139,11 +139,8 @@ public:
if (m_pipefd[1] != -1 && write(m_pipefd[1], "\0", 1) == -1)
qWarning("Failed to write to the pipe: %s.", strerror(errno));
{
QMutexLocker l(&m_mutex);
m_quitting = true;
m_cond.wakeOne();
}
m_quitting.storeRelaxed(true);
m_cond.wakeOne();
wait();
}
@ -216,11 +213,11 @@ private:
QMutexLocker lock(&m_mutex);
// m_reading might be set from our emit or some other invocation of
// readAndDispatchEvents().
while (!m_reading.loadRelaxed() && !m_quitting)
while (!m_reading.loadRelaxed() && !m_quitting.loadRelaxed())
m_cond.wait(&m_mutex);
}
return !m_quitting;
return !m_quitting.loadRelaxed();
}
int dispatchQueuePending()
@ -255,7 +252,7 @@ private:
*/
QAtomicInteger<bool> m_reading;
bool m_quitting;
QAtomicInteger<bool> m_quitting;
QMutex m_mutex;
QWaitCondition m_cond;
};