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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // This file is an internal atomic implementation, use base/atomicops.h instead.
      6 
      7 #ifndef BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
      8 #define BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
      9 #pragma once
     10 
     11 // AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32,
     12 // which in turn means int. On some LP32 platforms, intptr_t is an int, but
     13 // on others, it's a long. When AtomicWord and Atomic32 are based on different
     14 // fundamental types, their pointers are incompatible.
     15 //
     16 // This file defines function overloads to allow both AtomicWord and Atomic32
     17 // data to be used with this interface.
     18 //
     19 // On LP64 platforms, AtomicWord and Atomic64 are both always long,
     20 // so this problem doesn't occur.
     21 
     22 #if !defined(ARCH_CPU_64_BITS)
     23 
     24 namespace base {
     25 namespace subtle {
     26 
     27 inline AtomicWord NoBarrier_CompareAndSwap(volatile AtomicWord* ptr,
     28                                            AtomicWord old_value,
     29                                            AtomicWord new_value) {
     30   return NoBarrier_CompareAndSwap(
     31       reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
     32 }
     33 
     34 inline AtomicWord NoBarrier_AtomicExchange(volatile AtomicWord* ptr,
     35                                            AtomicWord new_value) {
     36   return NoBarrier_AtomicExchange(
     37       reinterpret_cast<volatile Atomic32*>(ptr), new_value);
     38 }
     39 
     40 inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr,
     41                                             AtomicWord increment) {
     42   return NoBarrier_AtomicIncrement(
     43       reinterpret_cast<volatile Atomic32*>(ptr), increment);
     44 }
     45 
     46 inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr,
     47                                           AtomicWord increment) {
     48   return Barrier_AtomicIncrement(
     49       reinterpret_cast<volatile Atomic32*>(ptr), increment);
     50 }
     51 
     52 inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr,
     53                                          AtomicWord old_value,
     54                                          AtomicWord new_value) {
     55   return base::subtle::Acquire_CompareAndSwap(
     56       reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
     57 }
     58 
     59 inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr,
     60                                          AtomicWord old_value,
     61                                          AtomicWord new_value) {
     62   return base::subtle::Release_CompareAndSwap(
     63       reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
     64 }
     65 
     66 inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) {
     67   NoBarrier_Store(
     68       reinterpret_cast<volatile Atomic32*>(ptr), value);
     69 }
     70 
     71 inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) {
     72   return base::subtle::Acquire_Store(
     73       reinterpret_cast<volatile Atomic32*>(ptr), value);
     74 }
     75 
     76 inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) {
     77   return base::subtle::Release_Store(
     78       reinterpret_cast<volatile Atomic32*>(ptr), value);
     79 }
     80 
     81 inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) {
     82   return NoBarrier_Load(
     83       reinterpret_cast<volatile const Atomic32*>(ptr));
     84 }
     85 
     86 inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
     87   return base::subtle::Acquire_Load(
     88       reinterpret_cast<volatile const Atomic32*>(ptr));
     89 }
     90 
     91 inline AtomicWord Release_Load(volatile const AtomicWord* ptr) {
     92   return base::subtle::Release_Load(
     93       reinterpret_cast<volatile const Atomic32*>(ptr));
     94 }
     95 
     96 }   // namespace base::subtle
     97 }   // namespace base
     98 
     99 #endif  // !defined(ARCH_CPU_64_BITS)
    100 
    101 #endif  // BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
    102