[Mesa-dev] [Bug 98172] Concurrent call to glClientWaitSync results in segfault in one of the waiters.

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Oct 17 20:14:39 UTC 2016


https://bugs.freedesktop.org/show_bug.cgi?id=98172

--- Comment #22 from Marek Olšák <maraeo at gmail.com> ---
It would be better to call fence_finish while not holding the mutex. For
example:

mtx_lock(&so->mtx);
/* If the fence doesn't exist, assume it's signalled. */
if (so->fence) {
   struct pipe_fence_handle *fence = NULL;
   screen->fence_reference(screen, &fence, so->fence);
   mtx_unlock(&so->mtx);

   if (screen->fence_finish(screen, fence, timeout)) {
      mtx_lock(&so->mtx);
      screen->fence_reference(screen, &so->fence, NULL);
      so->b.StatusFlag = GL_TRUE;
      mtx_unlock(&so->mtx);
   }
   screen->fence_reference(screen, &fence, NULL);
} else {
   mtx_unlock(&so->mtx);
}

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