michael@0: // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: // This file is an internal atomic implementation, use base/atomicops.h instead.
michael@0: 
michael@0: #ifndef BASE_ATOMICOPS_INTERNALS_X86_MACOSX_H_
michael@0: #define BASE_ATOMICOPS_INTERNALS_X86_MACOSX_H_
michael@0: 
michael@0: #include <libkern/OSAtomic.h>
michael@0: 
michael@0: namespace base {
michael@0: namespace subtle {
michael@0: 
michael@0: inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32 *ptr,
michael@0:                                          Atomic32 old_value,
michael@0:                                          Atomic32 new_value) {
michael@0:   Atomic32 prev_value;
michael@0:   do {
michael@0:     if (OSAtomicCompareAndSwap32(old_value, new_value,
michael@0:                                  const_cast<Atomic32*>(ptr))) {
michael@0:       return old_value;
michael@0:     }
michael@0:     prev_value = *ptr;
michael@0:   } while (prev_value == old_value);
michael@0:   return prev_value;
michael@0: }
michael@0: 
michael@0: inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32 *ptr,
michael@0:                                          Atomic32 new_value) {
michael@0:   Atomic32 old_value;
michael@0:   do {
michael@0:     old_value = *ptr;
michael@0:   } while (!OSAtomicCompareAndSwap32(old_value, new_value,
michael@0:                                      const_cast<Atomic32*>(ptr)));
michael@0:   return old_value;
michael@0: }
michael@0: 
michael@0: inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32 *ptr,
michael@0:                                           Atomic32 increment) {
michael@0:   return OSAtomicAdd32(increment, const_cast<Atomic32*>(ptr));
michael@0: }
michael@0: 
michael@0: inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32 *ptr,
michael@0:                                           Atomic32 increment) {
michael@0:   return OSAtomicAdd32Barrier(increment, const_cast<Atomic32*>(ptr));
michael@0: }
michael@0: 
michael@0: inline void MemoryBarrier() {
michael@0:   OSMemoryBarrier();
michael@0: }
michael@0: 
michael@0: inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32 *ptr,
michael@0:                                        Atomic32 old_value,
michael@0:                                        Atomic32 new_value) {
michael@0:   Atomic32 prev_value;
michael@0:   do {
michael@0:     if (OSAtomicCompareAndSwap32Barrier(old_value, new_value,
michael@0:                                         const_cast<Atomic32*>(ptr))) {
michael@0:       return old_value;
michael@0:     }
michael@0:     prev_value = *ptr;
michael@0:   } while (prev_value == old_value);
michael@0:   return prev_value;
michael@0: }
michael@0: 
michael@0: inline Atomic32 Release_CompareAndSwap(volatile Atomic32 *ptr,
michael@0:                                        Atomic32 old_value,
michael@0:                                        Atomic32 new_value) {
michael@0:   return Acquire_CompareAndSwap(ptr, old_value, new_value);
michael@0: }
michael@0: 
michael@0: inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
michael@0:   *ptr = value;
michael@0: }
michael@0: 
michael@0: inline void Acquire_Store(volatile Atomic32 *ptr, Atomic32 value) {
michael@0:   *ptr = value;
michael@0:   MemoryBarrier();
michael@0: }
michael@0: 
michael@0: inline void Release_Store(volatile Atomic32 *ptr, Atomic32 value) {
michael@0:   MemoryBarrier();
michael@0:   *ptr = value;
michael@0: }
michael@0: 
michael@0: inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
michael@0:   return *ptr;
michael@0: }
michael@0: 
michael@0: inline Atomic32 Acquire_Load(volatile const Atomic32 *ptr) {
michael@0:   Atomic32 value = *ptr;
michael@0:   MemoryBarrier();
michael@0:   return value;
michael@0: }
michael@0: 
michael@0: inline Atomic32 Release_Load(volatile const Atomic32 *ptr) {
michael@0:   MemoryBarrier();
michael@0:   return *ptr;
michael@0: }
michael@0: 
michael@0: #ifdef __LP64__
michael@0: 
michael@0: // 64-bit implementation on 64-bit platform
michael@0: 
michael@0: inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64 *ptr,
michael@0:                                          Atomic64 old_value,
michael@0:                                          Atomic64 new_value) {
michael@0:   Atomic64 prev_value;
michael@0:   do {
michael@0:     if (OSAtomicCompareAndSwap64(old_value, new_value,
michael@0:                                  const_cast<Atomic64*>(ptr))) {
michael@0:       return old_value;
michael@0:     }
michael@0:     prev_value = *ptr;
michael@0:   } while (prev_value == old_value);
michael@0:   return prev_value;
michael@0: }
michael@0: 
michael@0: inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64 *ptr,
michael@0:                                          Atomic64 new_value) {
michael@0:   Atomic64 old_value;
michael@0:   do {
michael@0:     old_value = *ptr;
michael@0:   } while (!OSAtomicCompareAndSwap64(old_value, new_value,
michael@0:                                      const_cast<Atomic64*>(ptr)));
michael@0:   return old_value;
michael@0: }
michael@0: 
michael@0: inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64 *ptr,
michael@0:                                           Atomic64 increment) {
michael@0:   return OSAtomicAdd64(increment, const_cast<Atomic64*>(ptr));
michael@0: }
michael@0: 
michael@0: inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64 *ptr,
michael@0:                                         Atomic64 increment) {
michael@0:   return OSAtomicAdd64Barrier(increment, const_cast<Atomic64*>(ptr));
michael@0: }
michael@0: 
michael@0: inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64 *ptr,
michael@0:                                        Atomic64 old_value,
michael@0:                                        Atomic64 new_value) {
michael@0:   Atomic64 prev_value;
michael@0:   do {
michael@0:     if (OSAtomicCompareAndSwap64Barrier(old_value, new_value,
michael@0:                                         const_cast<Atomic64*>(ptr))) {
michael@0:       return old_value;
michael@0:     }
michael@0:     prev_value = *ptr;
michael@0:   } while (prev_value == old_value);
michael@0:   return prev_value;
michael@0: }
michael@0: 
michael@0: inline Atomic64 Release_CompareAndSwap(volatile Atomic64 *ptr,
michael@0:                                        Atomic64 old_value,
michael@0:                                        Atomic64 new_value) {
michael@0:   // The lib kern interface does not distinguish between
michael@0:   // Acquire and Release memory barriers; they are equivalent.
michael@0:   return Acquire_CompareAndSwap(ptr, old_value, new_value);
michael@0: }
michael@0: 
michael@0: inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
michael@0:   *ptr = value;
michael@0: }
michael@0: 
michael@0: inline void Acquire_Store(volatile Atomic64 *ptr, Atomic64 value) {
michael@0:   *ptr = value;
michael@0:   MemoryBarrier();
michael@0: }
michael@0: 
michael@0: inline void Release_Store(volatile Atomic64 *ptr, Atomic64 value) {
michael@0:   MemoryBarrier();
michael@0:   *ptr = value;
michael@0: }
michael@0: 
michael@0: inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
michael@0:   return *ptr;
michael@0: }
michael@0: 
michael@0: inline Atomic64 Acquire_Load(volatile const Atomic64 *ptr) {
michael@0:   Atomic64 value = *ptr;
michael@0:   MemoryBarrier();
michael@0:   return value;
michael@0: }
michael@0: 
michael@0: inline Atomic64 Release_Load(volatile const Atomic64 *ptr) {
michael@0:   MemoryBarrier();
michael@0:   return *ptr;
michael@0: }
michael@0: 
michael@0: #endif  // defined(__LP64__)
michael@0: 
michael@0: // MacOS uses long for intptr_t, AtomicWord and Atomic32 are always different
michael@0: // on the Mac, even when they are the same size.  We need to explicitly cast
michael@0: // from AtomicWord to Atomic32/64 to implement the AtomicWord interface.
michael@0: #ifdef __LP64__
michael@0: #define AtomicWordCastType Atomic64
michael@0: #else
michael@0: #define AtomicWordCastType Atomic32
michael@0: #endif
michael@0: 
michael@0: inline AtomicWord NoBarrier_CompareAndSwap(volatile AtomicWord* ptr,
michael@0:                                            AtomicWord old_value,
michael@0:                                            AtomicWord new_value) {
michael@0:   return NoBarrier_CompareAndSwap(
michael@0:       reinterpret_cast<volatile AtomicWordCastType*>(ptr),
michael@0:       old_value, new_value);
michael@0: }
michael@0: 
michael@0: inline AtomicWord NoBarrier_AtomicExchange(volatile AtomicWord* ptr,
michael@0:                                            AtomicWord new_value) {
michael@0:   return NoBarrier_AtomicExchange(
michael@0:       reinterpret_cast<volatile AtomicWordCastType*>(ptr), new_value);
michael@0: }
michael@0: 
michael@0: inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr,
michael@0:                                             AtomicWord increment) {
michael@0:   return NoBarrier_AtomicIncrement(
michael@0:       reinterpret_cast<volatile AtomicWordCastType*>(ptr), increment);
michael@0: }
michael@0: 
michael@0: inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr,
michael@0:                                           AtomicWord increment) {
michael@0:   return Barrier_AtomicIncrement(
michael@0:       reinterpret_cast<volatile AtomicWordCastType*>(ptr), increment);
michael@0: }
michael@0: 
michael@0: inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr,
michael@0:                                          AtomicWord old_value,
michael@0:                                          AtomicWord new_value) {
michael@0:   return base::subtle::Acquire_CompareAndSwap(
michael@0:       reinterpret_cast<volatile AtomicWordCastType*>(ptr),
michael@0:       old_value, new_value);
michael@0: }
michael@0: 
michael@0: inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr,
michael@0:                                          AtomicWord old_value,
michael@0:                                          AtomicWord new_value) {
michael@0:   return base::subtle::Release_CompareAndSwap(
michael@0:       reinterpret_cast<volatile AtomicWordCastType*>(ptr),
michael@0:       old_value, new_value);
michael@0: }
michael@0: 
michael@0: inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) {
michael@0:   NoBarrier_Store(
michael@0:       reinterpret_cast<volatile AtomicWordCastType*>(ptr), value);
michael@0: }
michael@0: 
michael@0: inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) {
michael@0:   return base::subtle::Acquire_Store(
michael@0:       reinterpret_cast<volatile AtomicWordCastType*>(ptr), value);
michael@0: }
michael@0: 
michael@0: inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) {
michael@0:   return base::subtle::Release_Store(
michael@0:       reinterpret_cast<volatile AtomicWordCastType*>(ptr), value);
michael@0: }
michael@0: 
michael@0: inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) {
michael@0:   return NoBarrier_Load(
michael@0:       reinterpret_cast<volatile const AtomicWordCastType*>(ptr));
michael@0: }
michael@0: 
michael@0: inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
michael@0:   return base::subtle::Acquire_Load(
michael@0:       reinterpret_cast<volatile const AtomicWordCastType*>(ptr));
michael@0: }
michael@0: 
michael@0: inline AtomicWord Release_Load(volatile const AtomicWord* ptr) {
michael@0:   return base::subtle::Release_Load(
michael@0:       reinterpret_cast<volatile const AtomicWordCastType*>(ptr));
michael@0: }
michael@0: 
michael@0: #undef AtomicWordCastType
michael@0: 
michael@0: }   // namespace base::subtle
michael@0: }   // namespace base
michael@0: 
michael@0: #endif  // BASE_ATOMICOPS_INTERNALS_X86_MACOSX_H_