1 // Copyright 2010 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 // This file is an internal atomic implementation, use atomicops.h instead.
7 #ifndef V8_BASE_ATOMICOPS_INTERNALS_MAC_H_
8 #define V8_BASE_ATOMICOPS_INTERNALS_MAC_H_
10 #include <libkern/OSAtomic.h>
15 #define ATOMICOPS_COMPILER_BARRIER() __asm__ __volatile__("" : : : "memory")
17 inline void MemoryBarrier() { OSMemoryBarrier(); }
19 inline void AcquireMemoryBarrier() {
20 // On x86 processors, loads already have acquire semantics, so
21 // there is no need to put a full barrier here.
22 #if V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64
23 ATOMICOPS_COMPILER_BARRIER();
29 inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
34 if (OSAtomicCompareAndSwap32(old_value, new_value,
35 const_cast<Atomic32*>(ptr))) {
39 } while (prev_value == old_value);
43 inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
48 } while (!OSAtomicCompareAndSwap32(old_value, new_value,
49 const_cast<Atomic32*>(ptr)));
53 inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
55 return OSAtomicAdd32(increment, const_cast<Atomic32*>(ptr));
58 inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
60 return OSAtomicAdd32Barrier(increment, const_cast<Atomic32*>(ptr));
63 inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
68 if (OSAtomicCompareAndSwap32Barrier(old_value, new_value,
69 const_cast<Atomic32*>(ptr))) {
73 } while (prev_value == old_value);
77 inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
80 return Acquire_CompareAndSwap(ptr, old_value, new_value);
83 inline void NoBarrier_Store(volatile Atomic8* ptr, Atomic8 value) {
87 inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
91 inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
96 inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
101 inline Atomic8 NoBarrier_Load(volatile const Atomic8* ptr) {
105 inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
109 inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
110 Atomic32 value = *ptr;
111 AcquireMemoryBarrier();
115 inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
122 // 64-bit implementation on 64-bit platform
124 inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
126 Atomic64 new_value) {
129 if (OSAtomicCompareAndSwap64(old_value, new_value,
130 reinterpret_cast<volatile int64_t*>(ptr))) {
134 } while (prev_value == old_value);
138 inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
139 Atomic64 new_value) {
143 } while (!OSAtomicCompareAndSwap64(old_value, new_value,
144 reinterpret_cast<volatile int64_t*>(ptr)));
148 inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
149 Atomic64 increment) {
150 return OSAtomicAdd64(increment, reinterpret_cast<volatile int64_t*>(ptr));
153 inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
154 Atomic64 increment) {
155 return OSAtomicAdd64Barrier(increment,
156 reinterpret_cast<volatile int64_t*>(ptr));
159 inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
161 Atomic64 new_value) {
164 if (OSAtomicCompareAndSwap64Barrier(
165 old_value, new_value, reinterpret_cast<volatile int64_t*>(ptr))) {
169 } while (prev_value == old_value);
173 inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
175 Atomic64 new_value) {
176 // The lib kern interface does not distinguish between
177 // Acquire and Release memory barriers; they are equivalent.
178 return Acquire_CompareAndSwap(ptr, old_value, new_value);
181 inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
185 inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
190 inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
195 inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
199 inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
200 Atomic64 value = *ptr;
201 AcquireMemoryBarrier();
205 inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
210 #endif // defined(__LP64__)
212 #undef ATOMICOPS_COMPILER_BARRIER
213 } } // namespace v8::base
215 #endif // V8_BASE_ATOMICOPS_INTERNALS_MAC_H_