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// Copyright (c) 2011 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_ATOMICWORD_COMPAT_H_
#define BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
// AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32,
// which in turn means int. On some LP32 platforms, intptr_t is an int, but
// on others, it's a long. When AtomicWord and Atomic32 are based on different
// fundamental types, their pointers are incompatible.
//
// This file defines function overloads to allow both AtomicWord and Atomic32
// data to be used with this interface.
//
// On LP64 platforms, AtomicWord and Atomic64 are both always long,
// so this problem doesn't occur.
#if !defined(ARCH_CPU_64_BITS)
namespace base {
namespace subtle {
inline AtomicWord NoBarrier_CompareAndSwap(volatile AtomicWord* ptr,
AtomicWord old_value,
AtomicWord new_value) {
return NoBarrier_CompareAndSwap(
reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
}
inline AtomicWord NoBarrier_AtomicExchange(volatile AtomicWord* ptr,
AtomicWord new_value) {
return NoBarrier_AtomicExchange(
reinterpret_cast<volatile Atomic32*>(ptr), new_value);
}
inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr,
AtomicWord increment) {
return NoBarrier_AtomicIncrement(
reinterpret_cast<volatile Atomic32*>(ptr), increment);
}
inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr,
AtomicWord increment) {
return Barrier_AtomicIncrement(
reinterpret_cast<volatile Atomic32*>(ptr), increment);
}
inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr,
AtomicWord old_value,
AtomicWord new_value) {
return base::subtle::Acquire_CompareAndSwap(
reinterpret_cast<volatile Atomic32*>(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 Atomic32*>(ptr), old_value, new_value);
}
inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) {
NoBarrier_Store(
reinterpret_cast<volatile Atomic32*>(ptr), value);
}
inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) {
return base::subtle::Acquire_Store(
reinterpret_cast<volatile Atomic32*>(ptr), value);
}
inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) {
return base::subtle::Release_Store(
reinterpret_cast<volatile Atomic32*>(ptr), value);
}
inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) {
return NoBarrier_Load(
reinterpret_cast<volatile const Atomic32*>(ptr));
}
inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
return base::subtle::Acquire_Load(
reinterpret_cast<volatile const Atomic32*>(ptr));
}
inline AtomicWord Release_Load(volatile const AtomicWord* ptr) {
return base::subtle::Release_Load(
reinterpret_cast<volatile const Atomic32*>(ptr));
}
} // namespace base::subtle
} // namespace base
#endif // !defined(ARCH_CPU_64_BITS)
#endif // BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
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