diff options
| -rw-r--r-- | include/qemu/atomic.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/qemu/atomic.h b/include/qemu/atomic.h index a6ac188188..f9cd24c899 100644 --- a/include/qemu/atomic.h +++ b/include/qemu/atomic.h @@ -88,6 +88,13 @@ #define smp_read_barrier_depends() barrier() #endif +/* + * A signal barrier forces all pending local memory ops to be observed before + * a SIGSEGV is delivered to the *same* thread. In practice this is exactly + * the same as barrier(), but since we have the correct builtin, use it. + */ +#define signal_barrier() __atomic_signal_fence(__ATOMIC_SEQ_CST) + /* Sanity check that the size of an atomic operation isn't "overly large". * Despite the fact that e.g. i686 has 64-bit atomic operations, we do not * want to use them because we ought not need them, and this lets us do a @@ -308,6 +315,10 @@ #define smp_read_barrier_depends() barrier() #endif +#ifndef signal_barrier +#define signal_barrier() barrier() +#endif + /* These will only be atomic if the processor does the fetch or store * in a single issue memory operation */ |