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Diffstat (limited to 'ipc/chromium/src/base/atomicops_internals_x86_macosx.h')
| -rw-r--r-- | ipc/chromium/src/base/atomicops_internals_x86_macosx.h | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/ipc/chromium/src/base/atomicops_internals_x86_macosx.h b/ipc/chromium/src/base/atomicops_internals_x86_macosx.h new file mode 100644 index 000000000..c8f3a67af --- /dev/null +++ b/ipc/chromium/src/base/atomicops_internals_x86_macosx.h @@ -0,0 +1,281 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +// Copyright (c) 2006-2008 The Chromium 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 base/atomicops.h instead. + +#ifndef BASE_ATOMICOPS_INTERNALS_X86_MACOSX_H_ +#define BASE_ATOMICOPS_INTERNALS_X86_MACOSX_H_ + +#include <libkern/OSAtomic.h> + +namespace base { +namespace subtle { + +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 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 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, + const_cast<Atomic64*>(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, + const_cast<Atomic64*>(ptr))); + return old_value; +} + +inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64 *ptr, + Atomic64 increment) { + return OSAtomicAdd64(increment, const_cast<Atomic64*>(ptr)); +} + +inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64 *ptr, + Atomic64 increment) { + return OSAtomicAdd64Barrier(increment, const_cast<Atomic64*>(ptr)); +} + +inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64 *ptr, + Atomic64 old_value, + Atomic64 new_value) { + Atomic64 prev_value; + do { + if (OSAtomicCompareAndSwap64Barrier(old_value, new_value, + const_cast<Atomic64*>(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__) + +// MacOS uses long for intptr_t, AtomicWord and Atomic32 are always different +// on the Mac, even when they are the same size. We need to explicitly cast +// from AtomicWord to Atomic32/64 to implement the AtomicWord interface. +#ifdef __LP64__ +#define AtomicWordCastType Atomic64 +#else +#define AtomicWordCastType Atomic32 +#endif + +inline AtomicWord NoBarrier_CompareAndSwap(volatile AtomicWord* ptr, + AtomicWord old_value, + AtomicWord new_value) { + return NoBarrier_CompareAndSwap( + reinterpret_cast<volatile AtomicWordCastType*>(ptr), + old_value, new_value); +} + +inline AtomicWord NoBarrier_AtomicExchange(volatile AtomicWord* ptr, + AtomicWord new_value) { + return NoBarrier_AtomicExchange( + reinterpret_cast<volatile AtomicWordCastType*>(ptr), new_value); +} + +inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr, + AtomicWord increment) { + return NoBarrier_AtomicIncrement( + reinterpret_cast<volatile AtomicWordCastType*>(ptr), increment); +} + +inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr, + AtomicWord increment) { + return Barrier_AtomicIncrement( + reinterpret_cast<volatile AtomicWordCastType*>(ptr), increment); +} + +inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr, + AtomicWord old_value, + AtomicWord new_value) { + return base::subtle::Acquire_CompareAndSwap( + reinterpret_cast<volatile AtomicWordCastType*>(ptr), + old_value, new_value); +} + +inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr, + AtomicWord old_value, + AtomicWord new_value) { + return base::subtle::Release_CompareAndSwap( + reinterpret_cast<volatile AtomicWordCastType*>(ptr), + old_value, new_value); +} + +inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) { + NoBarrier_Store( + reinterpret_cast<volatile AtomicWordCastType*>(ptr), value); +} + +inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) { + return base::subtle::Acquire_Store( + reinterpret_cast<volatile AtomicWordCastType*>(ptr), value); +} + +inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) { + return base::subtle::Release_Store( + reinterpret_cast<volatile AtomicWordCastType*>(ptr), value); +} + +inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) { + return NoBarrier_Load( + reinterpret_cast<volatile const AtomicWordCastType*>(ptr)); +} + +inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) { + return base::subtle::Acquire_Load( + reinterpret_cast<volatile const AtomicWordCastType*>(ptr)); +} + +inline AtomicWord Release_Load(volatile const AtomicWord* ptr) { + return base::subtle::Release_Load( + reinterpret_cast<volatile const AtomicWordCastType*>(ptr)); +} + +#undef AtomicWordCastType + +} // namespace base::subtle +} // namespace base + +#endif // BASE_ATOMICOPS_INTERNALS_X86_MACOSX_H_ |