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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkAtomics_sync_DEFINED
#define SkAtomics_sync_DEFINED
/** GCC/Clang __sync based atomics. */
#include <stdint.h>
static inline __attribute__((always_inline)) int32_t sk_atomic_inc(int32_t* addr) {
return __sync_fetch_and_add(addr, 1);
}
static inline __attribute__((always_inline)) int32_t sk_atomic_add(int32_t* addr, int32_t inc) {
return __sync_fetch_and_add(addr, inc);
}
static inline __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t* addr) {
return __sync_fetch_and_add(addr, -1);
}
static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_dec() { }
static inline __attribute__((always_inline)) int32_t sk_atomic_conditional_inc(int32_t* addr) {
int32_t value = *addr;
while (true) {
if (value == 0) {
return 0;
}
int32_t before = __sync_val_compare_and_swap(addr, value, value + 1);
if (before == value) {
return value;
} else {
value = before;
}
}
}
static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_conditional_inc() { }
#endif
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