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membarrier: introduce qemu/sys_membarrier.h

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This new header file provides heavy-weight "global" memory barriers that
enforce memory ordering on each running thread belonging to the current
process. For now, use a dummy implementation that issues memory barriers
on both sides (matching what QEMU has been doing so far).

Backports commit c8d3877e48c4f57381d72eaf8d016bff12ce2d7c from qemu
This commit is contained in:
Paolo Bonzini 2018-03-17 19:19:23 -04:00 committed by Lioncash
parent 37117a74ed
commit 67cb6d16ff
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qemu/include/qemu/sys_membarrier.h Normal file
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/*
* Process-global memory barriers
*
* Copyright (c) 2018 Red Hat, Inc.
*
* Author: Paolo Bonzini <pbonzini@redhat.com>
*/
#ifndef QEMU_SYS_MEMBARRIER_H
#define QEMU_SYS_MEMBARRIER_H 1
/* Keep it simple, execute a real memory barrier on both sides. */
static inline void smp_mb_global_init(void) {}
#define smp_mb_global() smp_mb()
#define smp_mb_placeholder() smp_mb()
#endif