[FFmpeg-trac] #11456(avcodec:open): ffvp9 race

[FFmpeg]

#11456: ffvp9 race
-------------------------------------+-------------------------------------
             Reporter:  Ronald S.    |                    Owner:  (none)
  Bultje                             |
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Comment (by Ronald S. Bultje):

 This might be a mundane tsan issue. I can get the report to disappear with
 this patch:

 {{{
 $ git diff
 diff --git a/libavcodec/threadprogress.c b/libavcodec/threadprogress.c
 index 62c4fd898b..aa72ff80e7 100644
 --- a/libavcodec/threadprogress.c
 +++ b/libavcodec/threadprogress.c
 @@ -55,9 +55,8 @@ void ff_thread_progress_report(ThreadProgress *pro, int
 n)
      if (atomic_load_explicit(&pro->progress, memory_order_relaxed) >= n)
          return;

 -    atomic_store_explicit(&pro->progress, n, memory_order_release);
 -
      ff_mutex_lock(&pro->progress_mutex);
 +    atomic_store_explicit(&pro->progress, n, memory_order_release);
      ff_cond_broadcast(&pro->progress_cond);
      ff_mutex_unlock(&pro->progress_mutex);
  }
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11456#comment:2>
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