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| author | Pavel Tumakaev <p.tumakaev@lgepartner.com> | 2019-07-31 13:26:51 +0300 |
|---|---|---|
| committer | Pavel Tumakaev <p.tumakaev@lgepartner.com> | 2019-09-04 14:38:29 +0300 |
| commit | 33d2062f8ac9419ec1c6504be47fe48119e605bb (patch) | |
| tree | 1119566b5658e59e1d4e15b13741c98eefafd125 /src | |
| parent | 2e9c90aaefdfe5f1e9b90159c5e6981230627055 (diff) | |
| download | qtwayland-33d2062f8ac9419ec1c6504be47fe48119e605bb.tar.gz | |
Fix deadlock in QWaylandWindow::waitForFrameSync
Calling the QOpenGLContext::swapBuffers from
QGuiApplicationPrivate::processExposeEvent in some cases leads to
recursive calls of QWaylandWindow::waitForFrameSync. Since the
mWaitingForFrameCallback check in WaylandWindow::waitForFrameSync
is performed after the mutex is locked, the QMutexLocker tries to lock the
mFrameSyncMutex mutex in every recursive call, that leads to a deadlock.
This patch moves the performing of the mWaitingForFrameCallback check
before locking the mutex.
Change-Id: Ia2d834b7dd03fcd91bbe29a3a897b4db2d155527
Reviewed-by: Johan Helsing <johan.helsing@qt.io>
Diffstat (limited to 'src')
| -rw-r--r-- | src/client/qwaylandwindow.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/client/qwaylandwindow.cpp b/src/client/qwaylandwindow.cpp index abc54f58..95358232 100644 --- a/src/client/qwaylandwindow.cpp +++ b/src/client/qwaylandwindow.cpp @@ -657,10 +657,11 @@ QMutex QWaylandWindow::mFrameSyncMutex; bool QWaylandWindow::waitForFrameSync(int timeout) { - QMutexLocker locker(&mFrameSyncMutex); if (!mWaitingForFrameCallback) return true; + QMutexLocker locker(&mFrameSyncMutex); + wl_proxy_set_queue(reinterpret_cast<wl_proxy *>(mFrameCallback), mFrameQueue); mDisplay->dispatchQueueWhile(mFrameQueue, [&]() { return mWaitingForFrameCallback; }, timeout); |