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Merge "thread_utils: release mutex before signaling"

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James Zern 2019-06-12 06:15:22 +00:00 committed by Gerrit Code Review
commit bd39c063ce
1 changed files with 11 additions and 1 deletions
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12
src/utils/thread_utils.c
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@ -217,8 +217,12 @@ static THREADFN ThreadLoop(void* ptr) {
done = 1;
}
// signal to the main thread that we're done (for Sync())
pthread_cond_signal(&impl->condition_);
// Note the associated mutex does not need to be held when signaling the
// condition. Unlocking the mutex first may improve performance in some
// implementations, avoiding the case where the waiting thread can't
// reacquire the mutex when woken.
pthread_mutex_unlock(&impl->mutex_);
pthread_cond_signal(&impl->condition_);
}
return THREAD_RETURN(NULL); // Thread is finished
}
@ -240,7 +244,13 @@ static void ChangeState(WebPWorker* const worker, WebPWorkerStatus new_status) {
// assign new status and release the working thread if needed
if (new_status != OK) {
worker->status_ = new_status;
// Note the associated mutex does not need to be held when signaling the
// condition. Unlocking the mutex first may improve performance in some
// implementations, avoiding the case where the waiting thread can't
// reacquire the mutex when woken.
pthread_mutex_unlock(&impl->mutex_);
pthread_cond_signal(&impl->condition_);
return;
}
}
pthread_mutex_unlock(&impl->mutex_);