QEventDispatcher(Win): Always honor interrupted status to avoid races

There may be a race where e.g. thread 'B' is woken up by a queued invoke.
At the same time thread 'A' asks 'B' to quit, which will set various
atomics (some important ones are 'interrupt' in the dispatcher and
'exit' in the event loop), but it does _not_ try to send another wake
since there is already an unhandled wake triggered by 'B' itself.
Sadly 'B' reads the 'exit' atomic before 'A' updates it.
Then, slightly before, 'B' sets 'interrupt' back to 0, 'A' write 1 to
it, meaning 'A's interrupt is ignored. Then, since there is no
interrupt, 'B' goes back to waiting for events, leaving the thread alive
and running instead of quitting.

Maybe this has unforeseen consequences (one consequence is that it will
return and re-enter the event dispatcher once more, possible
unnecessarily)

Fixes: QTBUG-91539
Change-Id: Ie6f861f42ffddf4817d5c8af2d764abe9d9103c2
Reviewed-by: Alex Trotsenko <alex1973tr@gmail.com>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit f274f91cebb0a4fd2ebe37bb3a605c47d6acd404)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/corelib/kernel/qeventdispatcher_win.cpp b/src/corelib/kernel/qeventdispatcher_win.cpp
index 19604de32f..80297feef1 100644
--- a/src/corelib/kernel/qeventdispatcher_win.cpp
+++ b/src/corelib/kernel/qeventdispatcher_win.cpp
@@ -475,13 +475,17 @@ bool QEventDispatcherWin32::processEvents(QEventLoop::ProcessEventsFlags flags)
 {
     Q_D(QEventDispatcherWin32);
 
-    d->interrupt.storeRelaxed(false);
+    // We don't know _when_ the interrupt occurred so we have to honor it.
+    const bool wasInterrupted = d->interrupt.fetchAndStoreRelaxed(false);
     emit awake();
 
     // To prevent livelocks, send posted events once per iteration.
     // QCoreApplication::sendPostedEvents() takes care about recursions.
     sendPostedEvents();
 
+    if (wasInterrupted)
+        return false;
+
     auto threadData = d->threadData.loadRelaxed();
     bool canWait;
     bool retVal = false;