diff options
| -rw-r--r-- | src/util/u_queue.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/util/u_queue.c b/src/util/u_queue.c index 449da7dc9ab..3b05110e9f8 100644 --- a/src/util/u_queue.c +++ b/src/util/u_queue.c @@ -120,6 +120,19 @@ void util_queue_fence_destroy(struct util_queue_fence *fence) { assert(fence->signalled); + + /* Ensure that another thread is not in the middle of + * util_queue_fence_signal (having set the fence to signalled but still + * holding the fence mutex). + * + * A common contract between threads is that as soon as a fence is signalled + * by thread A, thread B is allowed to destroy it. Since + * util_queue_fence_is_signalled does not lock the fence mutex (for + * performance reasons), we must do so here. + */ + mtx_lock(&fence->mutex); + mtx_unlock(&fence->mutex); + cnd_destroy(&fence->cond); mtx_destroy(&fence->mutex); } |