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2170017a1c
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>
84 lines
2.5 KiB
Makefile
84 lines
2.5 KiB
Makefile
FATE_LIBAVUTIL += fate-adler32
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fate-adler32: libavutil/tests/adler32$(EXESUF)
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fate-adler32: CMD = run libavutil/tests/adler32
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fate-adler32: REF = /dev/null
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FATE_LIBAVUTIL += fate-aes
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fate-aes: libavutil/tests/aes$(EXESUF)
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fate-aes: CMD = run libavutil/tests/aes
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fate-aes: REF = /dev/null
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FATE_LIBAVUTIL += fate-avstring
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fate-avstring: libavutil/tests/avstring$(EXESUF)
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fate-avstring: CMD = run libavutil/tests/avstring
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FATE_LIBAVUTIL += fate-base64
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fate-base64: libavutil/tests/base64$(EXESUF)
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fate-base64: CMD = run libavutil/tests/base64
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FATE_LIBAVUTIL += fate-blowfish
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fate-blowfish: libavutil/tests/blowfish$(EXESUF)
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fate-blowfish: CMD = run libavutil/tests/blowfish
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FATE_LIBAVUTIL += fate-cpu
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fate-cpu: libavutil/tests/cpu$(EXESUF)
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fate-cpu: CMD = run libavutil/tests/cpu $(CPUFLAGS:%=-c%) $(THREADS:%=-t%)
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fate-cpu: REF = /dev/null
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FATE_LIBAVUTIL-$(HAVE_THREADS) += fate-cpu_init
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fate-cpu_init: libavutil/tests/cpu_init$(EXESUF)
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fate-cpu_init: CMD = run libavutil/tests/cpu_init
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fate-cpu_init: REF = /dev/null
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FATE_LIBAVUTIL += fate-crc
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fate-crc: libavutil/tests/crc$(EXESUF)
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fate-crc: CMD = run libavutil/tests/crc
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FATE_LIBAVUTIL += fate-des
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fate-des: libavutil/tests/des$(EXESUF)
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fate-des: CMD = run libavutil/tests/des
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fate-des: REF = /dev/null
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FATE_LIBAVUTIL += fate-eval
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fate-eval: libavutil/tests/eval$(EXESUF)
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fate-eval: CMD = run libavutil/tests/eval
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FATE_LIBAVUTIL += fate-fifo
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fate-fifo: libavutil/tests/fifo$(EXESUF)
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fate-fifo: CMD = run libavutil/tests/fifo
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FATE_LIBAVUTIL += fate-float-dsp
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fate-float-dsp: libavutil/tests/float_dsp$(EXESUF)
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fate-float-dsp: CMD = run libavutil/tests/float_dsp
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fate-float-dsp: CMP = null
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fate-float-dsp: REF = /dev/null
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FATE_LIBAVUTIL += fate-hmac
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fate-hmac: libavutil/tests/hmac$(EXESUF)
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fate-hmac: CMD = run libavutil/tests/hmac
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FATE_LIBAVUTIL += fate-md5
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fate-md5: libavutil/tests/md5$(EXESUF)
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fate-md5: CMD = run libavutil/tests/md5
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FATE_LIBAVUTIL += fate-parseutils
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fate-parseutils: libavutil/tests/parseutils$(EXESUF)
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fate-parseutils: CMD = run libavutil/tests/parseutils
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FATE_LIBAVUTIL += fate-sha
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fate-sha: libavutil/tests/sha$(EXESUF)
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fate-sha: CMD = run libavutil/tests/sha
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FATE_LIBAVUTIL += fate-tree
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fate-tree: libavutil/tests/tree$(EXESUF)
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fate-tree: CMD = run libavutil/tests/tree
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fate-tree: REF = /dev/null
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FATE_LIBAVUTIL += fate-xtea
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fate-xtea: libavutil/tests/xtea$(EXESUF)
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fate-xtea: CMD = run libavutil/tests/xtea
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FATE_LIBAVUTIL += $(FATE_LIBAVUTIL-yes)
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FATE-$(CONFIG_AVUTIL) += $(FATE_LIBAVUTIL)
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fate-libavutil: $(FATE_LIBAVUTIL)
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