onnxruntime

abb626ff - Provide alternative std::mutex implementation on Windows (#3000)

Provide alternative std::mutex implementation on Windows (#3000) Provide alternative std::mutex implementation on Windows. OrtMutex is no longer an alias of std::mutex. We do it because: 1. This new thing is faster and much much simpler. 2. Static constructors are considered harmful. We should avoid such thing as possible as we can.