101 lines
3.6 KiB
C
101 lines
3.6 KiB
C
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// This file is an internal atomic implementation, use base/atomicops.h instead.
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#ifndef BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
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#define BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
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// AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32,
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// which in turn means int. On some LP32 platforms, intptr_t is an int, but
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// on others, it's a long. When AtomicWord and Atomic32 are based on different
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// fundamental types, their pointers are incompatible.
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//
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// This file defines function overloads to allow both AtomicWord and Atomic32
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// data to be used with this interface.
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//
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// On LP64 platforms, AtomicWord and Atomic64 are both always long,
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// so this problem doesn't occur.
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#if !defined(ARCH_CPU_64_BITS)
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namespace base {
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namespace subtle {
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inline AtomicWord NoBarrier_CompareAndSwap(volatile AtomicWord* ptr,
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AtomicWord old_value,
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AtomicWord new_value) {
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return NoBarrier_CompareAndSwap(
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reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
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}
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inline AtomicWord NoBarrier_AtomicExchange(volatile AtomicWord* ptr,
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AtomicWord new_value) {
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return NoBarrier_AtomicExchange(
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reinterpret_cast<volatile Atomic32*>(ptr), new_value);
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}
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inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr,
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AtomicWord increment) {
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return NoBarrier_AtomicIncrement(
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reinterpret_cast<volatile Atomic32*>(ptr), increment);
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}
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inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr,
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AtomicWord increment) {
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return Barrier_AtomicIncrement(
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reinterpret_cast<volatile Atomic32*>(ptr), increment);
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}
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inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr,
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AtomicWord old_value,
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AtomicWord new_value) {
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return base::subtle::Acquire_CompareAndSwap(
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reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
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}
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inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr,
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AtomicWord old_value,
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AtomicWord new_value) {
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return base::subtle::Release_CompareAndSwap(
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reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
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}
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inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) {
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NoBarrier_Store(
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reinterpret_cast<volatile Atomic32*>(ptr), value);
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}
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inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) {
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return base::subtle::Acquire_Store(
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reinterpret_cast<volatile Atomic32*>(ptr), value);
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}
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inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) {
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return base::subtle::Release_Store(
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reinterpret_cast<volatile Atomic32*>(ptr), value);
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}
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inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) {
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return NoBarrier_Load(
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reinterpret_cast<volatile const Atomic32*>(ptr));
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}
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inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
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return base::subtle::Acquire_Load(
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reinterpret_cast<volatile const Atomic32*>(ptr));
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}
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inline AtomicWord Release_Load(volatile const AtomicWord* ptr) {
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return base::subtle::Release_Load(
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reinterpret_cast<volatile const Atomic32*>(ptr));
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}
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} // namespace base::subtle
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} // namespace base
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#endif // !defined(ARCH_CPU_64_BITS)
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#endif // BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
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