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https://github.com/lhmouse/mcfgthread/wiki

GCC with the MCF thread model

GCC with the MCF thread model is a series of x86 and x64 native toolchains built by LH_Mouse. The MCF thread model involves the mcfgthread library to provide minimum yet complete C++11 thread support. Disregarding POSIX or Windows XP compatibility, it implements (hopefully the most) efficient mutexes and condition variables that are competitive with even native slim reader/write (SRW) locks and condition variables since Windows Vista.

http://mingw-w64.org/doku.php/download