qemu

FORK: QEMU emulator
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sys_membarrier.h (737B)

      1 /*
      2  * Process-global memory barriers
      3  *
      4  * Copyright (c) 2018 Red Hat, Inc.
      5  *
      6  * Author: Paolo Bonzini <pbonzini@redhat.com>
      7  */
      8 
      9 #ifndef QEMU_SYS_MEMBARRIER_H
     10 #define QEMU_SYS_MEMBARRIER_H
     11 
     12 #ifdef CONFIG_MEMBARRIER
     13 /* Only block reordering at the compiler level in the performance-critical
     14  * side.  The slow side forces processor-level ordering on all other cores
     15  * through a system call.
     16  */
     17 extern void smp_mb_global_init(void);
     18 extern void smp_mb_global(void);
     19 #define smp_mb_placeholder()       barrier()
     20 #else
     21 /* Keep it simple, execute a real memory barrier on both sides.  */
     22 static inline void smp_mb_global_init(void) {}
     23 #define smp_mb_global()            smp_mb()
     24 #define smp_mb_placeholder()       smp_mb()
     25 #endif
     26 
     27 #endif