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      1 // Protocol Buffers - Google's data interchange format
      2 // Copyright 2012 Google Inc.  All rights reserved.
      3 // http://code.google.com/p/protobuf/
      4 //
      5 // Redistribution and use in source and binary forms, with or without
      6 // modification, are permitted provided that the following conditions are
      7 // met:
      8 //
      9 //     * Redistributions of source code must retain the above copyright
     10 // notice, this list of conditions and the following disclaimer.
     11 //     * Redistributions in binary form must reproduce the above
     12 // copyright notice, this list of conditions and the following disclaimer
     13 // in the documentation and/or other materials provided with the
     14 // distribution.
     15 //     * Neither the name of Google Inc. nor the names of its
     16 // contributors may be used to endorse or promote products derived from
     17 // this software without specific prior written permission.
     18 //
     19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30 
     31 // This file is an internal atomic implementation, use atomicops.h instead.
     32 
     33 #ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_PNACL_H_
     34 #define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_PNACL_H_
     35 
     36 namespace google {
     37 namespace protobuf {
     38 namespace internal {
     39 
     40 inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
     41                                          Atomic32 old_value,
     42                                          Atomic32 new_value) {
     43   return __sync_val_compare_and_swap(ptr, old_value, new_value);
     44 }
     45 
     46 inline void MemoryBarrier() {
     47   __sync_synchronize();
     48 }
     49 
     50 inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
     51                                        Atomic32 old_value,
     52                                        Atomic32 new_value) {
     53   Atomic32 ret = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
     54   MemoryBarrier();
     55   return ret;
     56 }
     57 
     58 inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
     59   MemoryBarrier();
     60   *ptr = value;
     61 }
     62 
     63 inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
     64   Atomic32 value = *ptr;
     65   MemoryBarrier();
     66   return value;
     67 }
     68 
     69 }  // namespace internal
     70 }  // namespace protobuf
     71 }  // namespace google
     72 
     73 #endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_PNACL_H_
     74