| |
| #ifndef __has_builtin |
| #define __has_builtin(x) 0 |
| #endif |
| #ifndef __has_feature |
| #define __has_feature(x) 0 |
| #endif |
| /** |
| * Swap macro that enforces a happens-before relationship with a corresponding |
| * ATOMIC_LOAD. |
| */ |
| #if __has_builtin(__c11_atomic_exchange) |
| #define ATOMIC_SWAP(addr, val)\ |
| __c11_atomic_exchange((_Atomic(__typeof__(val))*)addr, val, __ATOMIC_ACQ_REL) |
| #elif __has_builtin(__sync_swap) |
| #define ATOMIC_SWAP(addr, val)\ |
| __sync_swap(addr, val) |
| #else |
| #define ATOMIC_SWAP(addr, val)\ |
| __sync_lock_test_and_set(addr, val) |
| #endif |
| |
| #if __has_builtin(__c11_atomic_load) |
| #define ATOMIC_LOAD(addr)\ |
| __c11_atomic_load((_Atomic(__typeof__(*addr))*)addr, __ATOMIC_ACQUIRE) |
| #else |
| #define ATOMIC_LOAD(addr)\ |
| (__sync_synchronize(), *addr) |
| #endif |
| |
