Details
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Type:
Bug
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Status: Reported
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Priority:
P3: Somewhat important
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Resolution: Unresolved
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Affects Version/s: 6.2.4
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Fix Version/s: None
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Component/s: Core: Threads
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Labels:None
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Platform/s:
Windows
Description
Found this while investigating QTBUG-103922:
Sample code:
for (int i = 0; i < 1000; ++i) { QThread thread; thread.start(); thread.terminate(); thread.wait(); }
Sometimes this causes a hung at least on Windows - probably due to some internal race condition.
Pay attention that terminate() sometimes may have no any effect here, it just returns early because termination is not yet enabled in QThreadPrivate::start().
see src/corelib/thread/qthread_win.cpp:
unsigned int __stdcall QT_ENSURE_STACK_ALIGNED_FOR_SSE QThreadPrivate::start(void *arg) noexcept { ... QThread::setTerminationEnabled(false); ... QThread::setTerminationEnabled(true); ... }
void QThread::terminate()
{
...
if (!d->terminationEnabled) {
d->terminatePending = true;
return; // <----
}
...
}
Attachments
Issue Links
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- Closed
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