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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_android_DEFINED
#define SkAtomics_android_DEFINED
/** Android framework atomics. */
#include <cutils/atomic.h>
#include <stdint.h>
static inline __attribute__((always_inline)) int32_t sk_atomic_inc(int32_t* addr) {
return android_atomic_inc(addr);
}
static inline __attribute__((always_inline)) int32_t sk_atomic_add(int32_t* addr, int32_t inc) {
return android_atomic_add(inc, addr);
}
static inline __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t* addr) {
return android_atomic_dec(addr);
}
static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_dec() {
//HACK: Android is actually using full memory barriers.
// Should this change, uncomment below.
//int dummy;
//android_atomic_acquire_store(0, &dummy);
}
static inline __attribute__((always_inline)) int32_t sk_atomic_conditional_inc(int32_t* addr) {
while (true) {
int32_t value = *addr;
if (value == 0) {
return 0;
}
if (0 == android_atomic_release_cas(value, value + 1, addr)) {
return value;
}
}
}
static inline __attribute__((always_inline)) bool sk_atomic_cas(int32_t* addr,
int32_t before,
int32_t after) {
// android_atomic_release_cas returns 0 for success (if *addr == before and it wrote after).
return android_atomic_release_cas(before, after, addr) == 0;
}
static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_conditional_inc() {
//HACK: Android is actually using full memory barriers.
// Should this change, uncomment below.
//int dummy;
//android_atomic_acquire_store(0, &dummy);
}
#endif
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