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* Abstract rwlocks into a class, provide a SRW lock implementation for windowsMartin Storsjo2017-10-231-0/+77
This requires _WIN32_WINNT >= 0x0600. If someone wants to spend effort on supporting earlier versions, one can easily add another fallback implementation based on critical sections, or try to load SRW lock functions dynamically. This makes sure that the FDE cache is thread safe on windows. Differential Revision: https://reviews.llvm.org/D38704 llvm-svn: 316364
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