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| author | Ronald S. Bultje <rsbultje@gmail.com> | 2017-04-03 09:48:53 -0400 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-04-13 02:29:26 +0200 |
| commit | b51217381dd748fd831ba9403cdcdc8277bd63d5 (patch) | |
| tree | 477a4c67d8160f5fead8aacadae30da9d589d317 /libavcodec/blockdsp.h | |
| parent | f5f0b2f44ce9df08f7a79b32d9209b23ba6b3447 (diff) | |
| download | ffmpeg-b51217381dd748fd831ba9403cdcdc8277bd63d5.tar.gz | |
pthread_frame: call update_context_from_user() after acquiring lock.
Otherwise the thread may still be in the middle of decoding a previous
frame, which would effectively trigger a race condition on any field
concurrently read and written.
In practice, this fixes tsan warnings like the following:
WARNING: ThreadSanitizer: data race (pid=17380)
Write of size 4 at 0x7d64000160fc by main thread:
#0 update_context_from_user src/libavcodec/pthread_frame.c:335 (ffmpeg+0x000000dca515)
[..]
Previous read of size 4 at 0x7d64000160fc by thread T2 (mutexes: write M1821):
#0 ff_thread_report_progress src/libavcodec/pthread_frame.c:565 (ffmpeg+0x000000dcb08a)
(cherry picked from commit 1269cd5b6f540bef5913bf134d2f461aac50d70b)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/blockdsp.h')
0 files changed, 0 insertions, 0 deletions