sanitizer_atomic_clang_other.h [plain text]
#ifndef SANITIZER_ATOMIC_CLANG_OTHER_H
#define SANITIZER_ATOMIC_CLANG_OTHER_H
namespace __sanitizer {
INLINE void proc_yield(int cnt) {
__asm__ __volatile__("" ::: "memory");
}
template<typename T>
INLINE typename T::Type atomic_load(
const volatile T *a, memory_order mo) {
DCHECK(mo & (memory_order_relaxed | memory_order_consume
| memory_order_acquire | memory_order_seq_cst));
DCHECK(!((uptr)a % sizeof(*a)));
typename T::Type v;
if (sizeof(*a) < 8 || sizeof(void*) == 8) {
if (mo == memory_order_relaxed) {
v = a->val_dont_use;
} else if (mo == memory_order_consume) {
__asm__ __volatile__("" ::: "memory");
v = a->val_dont_use;
__asm__ __volatile__("" ::: "memory");
} else if (mo == memory_order_acquire) {
__asm__ __volatile__("" ::: "memory");
v = a->val_dont_use;
__sync_synchronize();
} else { __sync_synchronize();
v = a->val_dont_use;
__sync_synchronize();
}
} else {
v = __sync_fetch_and_add(
const_cast<typename T::Type volatile *>(&a->val_dont_use), 0);
}
return v;
}
template<typename T>
INLINE void atomic_store(volatile T *a, typename T::Type v, memory_order mo) {
DCHECK(mo & (memory_order_relaxed | memory_order_release
| memory_order_seq_cst));
DCHECK(!((uptr)a % sizeof(*a)));
if (sizeof(*a) < 8 || sizeof(void*) == 8) {
if (mo == memory_order_relaxed) {
a->val_dont_use = v;
} else if (mo == memory_order_release) {
__sync_synchronize();
a->val_dont_use = v;
__asm__ __volatile__("" ::: "memory");
} else { __sync_synchronize();
a->val_dont_use = v;
__sync_synchronize();
}
} else {
typename T::Type cmp = a->val_dont_use;
typename T::Type cur;
for (;;) {
cur = __sync_val_compare_and_swap(&a->val_dont_use, cmp, v);
if (cmp == v)
break;
cmp = cur;
}
}
}
}
#endif // #ifndef SANITIZER_ATOMIC_CLANG_OTHER_H