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