30 lines
665 B
C
30 lines
665 B
C
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#ifndef __has_builtin
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#define __has_builtin(x) 0
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#endif
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#ifndef __has_feature
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#define __has_feature(x) 0
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#endif
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/**
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* Swap macro that enforces a happens-before relationship with a corresponding
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* ATOMIC_LOAD.
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*/
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#if __has_feature(cxx_atomic)
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#define ATOMIC_SWAP(addr, val)\
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__atomic_exchange(addr, val, __ATOMIC_ACQ_REL)
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#elif __has_builtin(__sync_swap)
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#define ATOMIC_SWAP(addr, val)\
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__sync_swap(addr, val)
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#else
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#define ATOMIC_SWAP(addr, val)\
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__sync_lock_test_and_set(addr, val)
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#endif
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#if __has_feature(cxx_atomic)
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#define ATOMIC_LOAD(addr)\
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__atomic_load(addr, __ATOMIC_ACQUIRE)
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#else
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#define ATOMIC_LOAD(addr)\
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(__sync_synchronize(), *addr)
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#endif
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