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n3.2.11
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n0.9
n0.8.15
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n0.7.13
n0.7.12
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n0.7.6
n0.7.5
n0.7.4
n0.7.3
n0.7.2
n0.7.1
n0.6.7
n0.6.6
n0.6.5
n0.6.4
ffmpeg-0.6.3
n0.5.15
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n0.5.13
n0.5.12
n0.5.11
n0.5.10
n0.5.9
n0.5.8
n0.5.7
n0.5.6
n0.5.5
N
1 Commits (acfa7a2178f08fd81b66279959cd55ec3ae237e2)
1 Commits (acfa7a2178f08fd81b66279959cd55ec3ae237e2)
| Author | SHA1 | Message | Date |
|---|---|---|---|
 Wan-Teh Chang
|
2170017a1c |
avutil: fix data race in av_get_cpu_flags()
Make the one-time initialization in av_get_cpu_flags() thread-safe. The
static variables |flags|, |cpuflags_mask|, and |checked| in
libavutil/cpu.c are read and written using normal load and store
operations. These are considered as data races. The fix is to use atomic
load and store operations.
Remove the |checked| variable because the invalid value of -1 for
|flags| can be used to indicate the same condition. Rename |flags| to
|cpu_flags| and move it to file scope.
The fix can be verified by running the libavutil/tests/cpu_init.c test
program under ThreadSanitizer:
./configure --toolchain=clang-tsan
make libavutil/tests/cpu_init
libavutil/tests/cpu_init
There should be no warnings from ThreadSanitizer.
Co-author: Dmitry Vyukov of Google, who suggested the data race fix.
Signed-off-by: Wan-Teh Chang <wtc@google.com>
|
9 years ago |