libcxxrt

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atomic.h (784B)

      1 
      2 #ifndef __has_builtin
      3 #define __has_builtin(x) 0
      4 #endif
      5 #ifndef __has_feature
      6 #define __has_feature(x) 0
      7 #endif
      8 /**
      9  * Swap macro that enforces a happens-before relationship with a corresponding
     10  * ATOMIC_LOAD.
     11  */
     12 #if __has_builtin(__c11_atomic_exchange)
     13 #define ATOMIC_SWAP(addr, val)\
     14 	__c11_atomic_exchange(reinterpret_cast<_Atomic(__typeof__(val))*>(addr), val, __ATOMIC_ACQ_REL)
     15 #elif __has_builtin(__sync_swap)
     16 #define ATOMIC_SWAP(addr, val)\
     17 	__sync_swap(addr, val)
     18 #else
     19 #define ATOMIC_SWAP(addr, val)\
     20 	__sync_lock_test_and_set(addr, val)
     21 #endif
     22 
     23 #if __has_builtin(__c11_atomic_load)
     24 #define ATOMIC_LOAD(addr)\
     25 	__c11_atomic_load(reinterpret_cast<_Atomic(__typeof__(*addr))*>(addr), __ATOMIC_ACQUIRE)
     26 #else
     27 #define ATOMIC_LOAD(addr)\
     28 	(__sync_synchronize(), *addr)
     29 #endif
     30