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- // Copyright (c) 2012 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- // This file is an internal atomic implementation, use base/atomicops.h instead.
- #ifndef BASE_ATOMICOPS_INTERNALS_MAC_H_
- #define BASE_ATOMICOPS_INTERNALS_MAC_H_
- #include <libkern/OSAtomic.h>
- namespace base {
- namespace subtle {
- inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
- Atomic32 old_value,
- Atomic32 new_value) {
- Atomic32 prev_value;
- do {
- if (OSAtomicCompareAndSwap32(old_value, new_value,
- const_cast<Atomic32*>(ptr))) {
- return old_value;
- }
- prev_value = *ptr;
- } while (prev_value == old_value);
- return prev_value;
- }
- inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
- Atomic32 new_value) {
- Atomic32 old_value;
- do {
- old_value = *ptr;
- } while (!OSAtomicCompareAndSwap32(old_value, new_value,
- const_cast<Atomic32*>(ptr)));
- return old_value;
- }
- inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
- Atomic32 increment) {
- return OSAtomicAdd32(increment, const_cast<Atomic32*>(ptr));
- }
- inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
- Atomic32 increment) {
- return OSAtomicAdd32Barrier(increment, const_cast<Atomic32*>(ptr));
- }
- inline void MemoryBarrier() {
- OSMemoryBarrier();
- }
- inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
- Atomic32 old_value,
- Atomic32 new_value) {
- Atomic32 prev_value;
- do {
- if (OSAtomicCompareAndSwap32Barrier(old_value, new_value,
- const_cast<Atomic32*>(ptr))) {
- return old_value;
- }
- prev_value = *ptr;
- } while (prev_value == old_value);
- return prev_value;
- }
- inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
- Atomic32 old_value,
- Atomic32 new_value) {
- return Acquire_CompareAndSwap(ptr, old_value, new_value);
- }
- inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
- *ptr = value;
- }
- inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
- *ptr = value;
- MemoryBarrier();
- }
- inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
- MemoryBarrier();
- *ptr = value;
- }
- inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
- return *ptr;
- }
- inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
- Atomic32 value = *ptr;
- MemoryBarrier();
- return value;
- }
- inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
- MemoryBarrier();
- return *ptr;
- }
- #ifdef __LP64__
- // 64-bit implementation on 64-bit platform
- inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
- Atomic64 old_value,
- Atomic64 new_value) {
- Atomic64 prev_value;
- do {
- if (OSAtomicCompareAndSwap64(old_value, new_value,
- reinterpret_cast<volatile int64_t*>(ptr))) {
- return old_value;
- }
- prev_value = *ptr;
- } while (prev_value == old_value);
- return prev_value;
- }
- inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
- Atomic64 new_value) {
- Atomic64 old_value;
- do {
- old_value = *ptr;
- } while (!OSAtomicCompareAndSwap64(old_value, new_value,
- reinterpret_cast<volatile int64_t*>(ptr)));
- return old_value;
- }
- inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
- Atomic64 increment) {
- return OSAtomicAdd64(increment, reinterpret_cast<volatile int64_t*>(ptr));
- }
- inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
- Atomic64 increment) {
- return OSAtomicAdd64Barrier(increment,
- reinterpret_cast<volatile int64_t*>(ptr));
- }
- inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
- Atomic64 old_value,
- Atomic64 new_value) {
- Atomic64 prev_value;
- do {
- if (OSAtomicCompareAndSwap64Barrier(
- old_value, new_value, reinterpret_cast<volatile int64_t*>(ptr))) {
- return old_value;
- }
- prev_value = *ptr;
- } while (prev_value == old_value);
- return prev_value;
- }
- inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
- Atomic64 old_value,
- Atomic64 new_value) {
- // The lib kern interface does not distinguish between
- // Acquire and Release memory barriers; they are equivalent.
- return Acquire_CompareAndSwap(ptr, old_value, new_value);
- }
- inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
- *ptr = value;
- }
- inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
- *ptr = value;
- MemoryBarrier();
- }
- inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
- MemoryBarrier();
- *ptr = value;
- }
- inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
- return *ptr;
- }
- inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
- Atomic64 value = *ptr;
- MemoryBarrier();
- return value;
- }
- inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
- MemoryBarrier();
- return *ptr;
- }
- #endif // defined(__LP64__)
- } // namespace base::subtle
- } // namespace base
- #endif // BASE_ATOMICOPS_INTERNALS_MAC_H_
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