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Commit Graph

3 Commits (fccba32b4c4f16682b2c34a4c84449a84f91d4d9)

Author	SHA1	Message	Date
Wan-Teh Chang	3703f13333	avutil/tests: run the cpu_init.c test conditionally on HAVE_THREADS ... Suggested by Diego Biurrun and James Almer. Signed-off-by: Wan-Teh Chang <wtc@google.com> Signed-off-by: James Almer <jamrial@gmail.com>	8 years ago
Wan-Teh Chang	8986885801	avutil/cpu_init: remove unnecessary arguments to the main() function ... Signed-off-by: James Almer <jamrial@gmail.com>	8 years ago
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>	8 years ago
Wan-Teh Chang	d84a21207e	avutil/tests: Add cpu_init.c to check whether the one-time initialization in av_get_cpu_flags() has data races. ... Co-author: Dmitry Vyukov of Google Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>	8 years ago