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Fixed the queue filling up with sentinel events when the WaitEvent call is passed NULL for the event

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The use case is an application that waits for events on the main thread and dispatches them on a separate thread.
This commit is contained in:
Sam Lantinga 2022-01-25 12:37:43 -08:00
parent f0e768da43
commit 84320266f2
1 changed files with 5 additions and 1 deletions
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6
src/events/SDL_events.c
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@ -891,7 +891,11 @@ SDL_WaitEventTimeout_Device(_THIS, SDL_Window *wakeup_window, SDL_Event * event,
c) Periodic processing that takes place in some platform PumpEvents() functions happens
d) Signals received in WaitEventTimeout() are turned into SDL events
*/
SDL_PumpEventsInternal(SDL_TRUE);
/* We only want a single sentinel in the queue. We could get more than one if event is NULL,
* since the SDL_PeepEvents() call below won't remove it in that case.
*/
SDL_bool add_sentinel = (SDL_AtomicGet(&SDL_sentinel_pending) == 0) ? SDL_TRUE : SDL_FALSE;
SDL_PumpEventsInternal(add_sentinel);
if (!_this->wakeup_lock || SDL_LockMutex(_this->wakeup_lock) == 0) {
int status = SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_FIRSTEVENT, SDL_LASTEVENT);