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w32pthreads: Map MemoryBarrier to __sync_synchronize on mingw
This fixes building on older mingw (both mingw.org and mingw64; mingw64 from before May 2011). Signed-off-by: Martin Storsjö <martin@martin.st>
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@ -39,9 +39,9 @@
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#include <windows.h>
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#include <process.h>
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/* MinGW requires the intrinsics header for the pthread_once fallback code */
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#if _WIN32_WINNT < 0x0600 && defined(__MINGW32__)
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#include <intrin.h>
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#undef MemoryBarrier
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#define MemoryBarrier __sync_synchronize
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#endif
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#include "libavutil/attributes.h"
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