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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 
     10 #include <stdint.h>
     11 
     12 #include "build/build_config.h"
     13 
     14 // AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32_t,
     15 // which in turn means int. On some LP32 platforms, intptr_t is an int, but
     16 // on others, it's a long. When AtomicWord and Atomic32 are based on different
     17 // fundamental types, their pointers are incompatible.
     18 //
     19 // This file defines function overloads to allow both AtomicWord and Atomic32
     20 // data to be used with this interface.
     21 //
     22 // On LP64 platforms, AtomicWord and Atomic64 are both always long,
     23 // so this problem doesn't occur.
     24 
     25 #if !defined(ARCH_CPU_64_BITS)
     26 
     27 namespace base {
     28 namespace subtle {
     29 
     30 inline AtomicWord NoBarrier_CompareAndSwap(volatile AtomicWord* ptr,
     31                                            AtomicWord old_value,
     32                                            AtomicWord new_value) {
     33   return NoBarrier_CompareAndSwap(
     34       reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
     35 }
     36 
     37 inline AtomicWord NoBarrier_AtomicExchange(volatile AtomicWord* ptr,
     38                                            AtomicWord new_value) {
     39   return NoBarrier_AtomicExchange(
     40       reinterpret_cast<volatile Atomic32*>(ptr), new_value);
     41 }
     42 
     43 inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr,
     44                                             AtomicWord increment) {
     45   return NoBarrier_AtomicIncrement(
     46       reinterpret_cast<volatile Atomic32*>(ptr), increment);
     47 }
     48 
     49 inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr,
     50                                           AtomicWord increment) {
     51   return Barrier_AtomicIncrement(
     52       reinterpret_cast<volatile Atomic32*>(ptr), increment);
     53 }
     54 
     55 inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr,
     56                                          AtomicWord old_value,
     57                                          AtomicWord new_value) {
     58   return base::subtle::Acquire_CompareAndSwap(
     59       reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
     60 }
     61 
     62 inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr,
     63                                          AtomicWord old_value,
     64                                          AtomicWord new_value) {
     65   return base::subtle::Release_CompareAndSwap(
     66       reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
     67 }
     68 
     69 inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) {
     70   NoBarrier_Store(
     71       reinterpret_cast<volatile Atomic32*>(ptr), value);
     72 }
     73 
     74 inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) {
     75   return base::subtle::Acquire_Store(
     76       reinterpret_cast<volatile Atomic32*>(ptr), value);
     77 }
     78 
     79 inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) {
     80   return base::subtle::Release_Store(
     81       reinterpret_cast<volatile Atomic32*>(ptr), value);
     82 }
     83 
     84 inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) {
     85   return NoBarrier_Load(
     86       reinterpret_cast<volatile const Atomic32*>(ptr));
     87 }
     88 
     89 inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
     90   return base::subtle::Acquire_Load(
     91       reinterpret_cast<volatile const Atomic32*>(ptr));
     92 }
     93 
     94 inline AtomicWord Release_Load(volatile const AtomicWord* ptr) {
     95   return base::subtle::Release_Load(
     96       reinterpret_cast<volatile const Atomic32*>(ptr));
     97 }
     98 
     99 }  // namespace subtle
    100 }  // namespace base
    101 
    102 #endif  // !defined(ARCH_CPU_64_BITS)
    103 
    104 #endif  // BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
    105