Limits the compiler optimizations that can reorder memory access operations across the point of the call.
The _ReadBarrier, _WriteBarrier, and _ReadWriteBarrier compiler intrinsics and the MemoryBarrier macro are all deprecated and should not be used. For inter-thread communication, use mechanisms such as atomic_thread_fence and std::atomic<T> that are defined in the C++ Standard Library Reference. For hardware access, use the /volatile:iso compiler option together with the volatile (C++) keyword.
Header file <intrin.h>
The _ReadBarrier intrinsic limits the compiler optimizations that can remove or reorder memory access operations across the point of the call.