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include/qemu/atomic.h: Add signal_barrier

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We have some potential race conditions vs our user-exec signal
handler that will be solved with this barrier.

Backports commit 359896dfa4e9707e1acea99129d324250fccab04 from qemu
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Richard Henderson 2019-08-08 19:26:40 -04:00 committed by Lioncash
parent d291a311ee
commit ec81aef8c0
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1 changed files with 11 additions and 0 deletions
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11
qemu/include/qemu/atomic.h
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@ -96,6 +96,13 @@ void _ReadWriteBarrier(void);
#define smp_read_barrier_depends() barrier() #define smp_read_barrier_depends() barrier()
#endif #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". /* 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 * 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 * want to use them because we ought not need them, and this lets us do a
@ -325,6 +332,10 @@ void _ReadWriteBarrier(void);
#define smp_read_barrier_depends() barrier() #define smp_read_barrier_depends() barrier()
#endif #endif
#ifndef signal_barrier
#define signal_barrier() barrier()
#endif
/* These will only be atomic if the processor does the fetch or store /* These will only be atomic if the processor does the fetch or store
* in a single issue memory operation * in a single issue memory operation
*/ */