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48bb0da050
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release/0.5
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release/0.9
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release/2.7
release/2.8
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release/3.3
release/3.4
release/4.0
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release/4.2
release/4.3
release/4.4
v0.6.1
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v0.5.1
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n4.0.4
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n4.0.2
n4.0.1
n4.0
n3.4.8
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n3.4.6
n3.4.5
n3.4.4
n3.4.3
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n3.3.8
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n3.3.6
n3.3.5
n3.3.4
n3.3.3
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n3.3.1
n3.3
n3.2.15
n3.2.14
n3.2.13
n3.2.12
n3.2.11
n3.2.10
n3.2.9
n3.2.8
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n3.2.3
n3.2.2
n3.2.1
n3.2
n3.1.11
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n3.1.2
n3.1.1
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n3.0.10
n3.0.9
n3.0.8
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n3.0
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n2.7.7
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n2.7.3
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n2.6.5
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n2.6
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n2.4.11
n2.4.10
n2.4.9
n2.4.8
n2.4.7
n2.4.6
n2.4.5
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n2.4.3
n2.4.2
n2.4.1
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n2.3.2
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n2.2.12
n2.2.11
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n2.2.1
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n2.1.8
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n2.1.1
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n0.9.3
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n0.9
n0.8.15
n0.8.14
n0.8.13
n0.8.12
n0.8.11
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n0.8.9
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n0.8.4
n0.8.3
n0.8.2
n0.8.1
n0.8
n0.7.17
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n0.7.15
n0.7.14
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
n0.5.14
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 (48bb0da050329e5111b00a12dfc154b7e78fb3a3)
1 Commits (48bb0da050329e5111b00a12dfc154b7e78fb3a3)
| 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 |