28 lines
737 B
C
28 lines
737 B
C
/*
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* Process-global memory barriers
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*
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* Copyright (c) 2018 Red Hat, Inc.
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*
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* Author: Paolo Bonzini <pbonzini@redhat.com>
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*/
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#ifndef QEMU_SYS_MEMBARRIER_H
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#define QEMU_SYS_MEMBARRIER_H
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#ifdef CONFIG_MEMBARRIER
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/* Only block reordering at the compiler level in the performance-critical
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* side. The slow side forces processor-level ordering on all other cores
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* through a system call.
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*/
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extern void smp_mb_global_init(void);
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extern void smp_mb_global(void);
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#define smp_mb_placeholder() barrier()
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#else
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/* Keep it simple, execute a real memory barrier on both sides. */
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static inline void smp_mb_global_init(void) {}
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#define smp_mb_global() smp_mb()
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#define smp_mb_placeholder() smp_mb()
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#endif
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#endif
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