readbarrier.md

description	title	ms.date	f1_keywords	helpviewer_keywords	ms.assetid
Learn more about: _ReadBarrier	_ReadBarrier	09/02/2019	_ReadBarrier	_ReadBarrier intrinsic	f9e54a92-61bc-4f55-8195-b8932065a796

_ReadBarrier

Microsoft Specific

Limits the compiler optimizations that can reorder memory access operations across the point of the call.

Caution

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. For hardware access, use the /volatile:iso compiler option together with the volatile keyword.

Syntax

void _ReadBarrier(void);

Requirements

Intrinsic	Architecture
_ReadBarrier	x86, x64

Header file <intrin.h>

Remarks

The _ReadBarrier intrinsic limits the compiler optimizations that can remove or reorder memory access operations across the point of the call.

END Microsoft Specific

See also

Compiler intrinsics
Keywords