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Diffstat (limited to 'chromium/v8/src/base/atomicops_internals_mac.h')
| -rw-r--r-- | chromium/v8/src/base/atomicops_internals_mac.h | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/chromium/v8/src/base/atomicops_internals_mac.h b/chromium/v8/src/base/atomicops_internals_mac.h new file mode 100644 index 00000000000..a046872e4d0 --- /dev/null +++ b/chromium/v8/src/base/atomicops_internals_mac.h @@ -0,0 +1,204 @@ +// Copyright 2010 the V8 project 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 atomicops.h instead. + +#ifndef V8_BASE_ATOMICOPS_INTERNALS_MAC_H_ +#define V8_BASE_ATOMICOPS_INTERNALS_MAC_H_ + +#include <libkern/OSAtomic.h> + +namespace v8 { +namespace base { + +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 Atomic8* ptr, Atomic8 value) { + *ptr = 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 Atomic8 NoBarrier_Load(volatile const Atomic8* ptr) { + return *ptr; +} + +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 v8::base + +#endif // V8_BASE_ATOMICOPS_INTERNALS_MAC_H_ |