1 // Protocol Buffers - Google's data interchange format
2 // Copyright 2012 Google Inc. All rights reserved.
3 // https://developers.google.com/protocol-buffers/
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6 // modification, are permitted provided that the following conditions are
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10 // notice, this list of conditions and the following disclaimer.
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12 // copyright notice, this list of conditions and the following disclaimer
13 // in the documentation and/or other materials provided with the
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17 // this software without specific prior written permission.
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29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 // This file is an internal atomic implementation, use atomicops.h instead.
33 #ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_MACOSX_H_
34 #define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_MACOSX_H_
36 #include <libkern/OSAtomic.h>
42 inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
47 if (OSAtomicCompareAndSwap32(old_value, new_value,
48 const_cast<Atomic32*>(ptr))) {
52 } while (prev_value == old_value);
56 inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
61 } while (!OSAtomicCompareAndSwap32(old_value, new_value,
62 const_cast<Atomic32*>(ptr)));
66 inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
68 return OSAtomicAdd32(increment, const_cast<Atomic32*>(ptr));
71 inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
73 return OSAtomicAdd32Barrier(increment, const_cast<Atomic32*>(ptr));
76 inline void MemoryBarrier() {
80 inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
85 if (OSAtomicCompareAndSwap32Barrier(old_value, new_value,
86 const_cast<Atomic32*>(ptr))) {
90 } while (prev_value == old_value);
94 inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
97 return Acquire_CompareAndSwap(ptr, old_value, new_value);
100 inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
104 inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
109 inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
114 inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
118 inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
119 Atomic32 value = *ptr;
124 inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
131 // 64-bit implementation on 64-bit platform
133 inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
135 Atomic64 new_value) {
138 if (OSAtomicCompareAndSwap64(old_value, new_value,
139 reinterpret_cast<volatile int64_t*>(ptr))) {
143 } while (prev_value == old_value);
147 inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
148 Atomic64 new_value) {
152 } while (!OSAtomicCompareAndSwap64(old_value, new_value,
153 reinterpret_cast<volatile int64_t*>(ptr)));
157 inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
158 Atomic64 increment) {
159 return OSAtomicAdd64(increment, reinterpret_cast<volatile int64_t*>(ptr));
162 inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
163 Atomic64 increment) {
164 return OSAtomicAdd64Barrier(increment,
165 reinterpret_cast<volatile int64_t*>(ptr));
168 inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
170 Atomic64 new_value) {
173 if (OSAtomicCompareAndSwap64Barrier(
174 old_value, new_value, reinterpret_cast<volatile int64_t*>(ptr))) {
178 } while (prev_value == old_value);
182 inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
184 Atomic64 new_value) {
185 // The lib kern interface does not distinguish between
186 // Acquire and Release memory barriers; they are equivalent.
187 return Acquire_CompareAndSwap(ptr, old_value, new_value);
190 inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
194 inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
199 inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
204 inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
208 inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
209 Atomic64 value = *ptr;
214 inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
219 #endif // defined(__LP64__)
221 } // namespace internal
222 } // namespace protobuf
223 } // namespace google
225 #endif // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_MACOSX_H_