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