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• avutil : fix data race in av_get_cpu_flags()

  8 décembre 2016, par Wan-Teh Chang

  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>
  

  • [DBH] libavutil/Makefile
  • [DBH] libavutil/cpu.c
  • [DBH] libavutil/cpu.h
  • [DBH] libavutil/tests/.gitignore
  • [DBH] libavutil/tests/cpu_init.c
  • [DBH] tests/fate/libavutil.mak

• dxva2 : Adjust multiple inclusion guard names to follow convention

  7 décembre 2016, par Diego Biurrun

  dxva2: Adjust multiple inclusion guard names to follow convention
  

  • [DBH] libavcodec/dxva2.h
  • [DBH] libavcodec/dxva2_internal.h

• configure : Fail if cuda was enabled and is not available

  7 décembre 2016, par Diego Biurrun

  configure: Fail if cuda was enabled and is not available
  
  This is the standard behavior for external libraries.
  

  • [DBH] configure

• build : Ensure that the "all" target appears before all Makefile includes

  7 décembre 2016, par Diego Biurrun

  build: Ensure that the "all" target appears before all Makefile includes
  
  Otherwise builds without explicit target result in silent no-ops.
  

  • [DBH] Makefile
  • [DBH] common.mak

• build : Drop stray golomb dependencies

  7 décembre 2016, par Diego Biurrun

  build: Drop stray golomb dependencies
  

  • [DBH] configure