Page Speed Optimization Libraries  1.2.24.1
net/instaweb/util/public/atomic_int32.h
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00001 /*
00002  * Copyright 2011 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00018 
00019 #ifndef NET_INSTAWEB_UTIL_PUBLIC_ATOMIC_INT32_H_
00020 #define NET_INSTAWEB_UTIL_PUBLIC_ATOMIC_INT32_H_
00021 
00022 #include "net/instaweb/util/public/atomicops.h"
00023 #include "net/instaweb/util/public/basictypes.h"
00024 
00025 namespace net_instaweb {
00026 
00072 class AtomicInt32 {
00073  public:
00074   explicit AtomicInt32(int32 value) {
00075     set_value(value);
00076   }
00077   AtomicInt32() {
00078     set_value(0);
00079   }
00080   ~AtomicInt32() {}
00081 
00083   int32 value() const {
00084     return base::subtle::Acquire_Load(&value_);
00085   }
00086 
00090   int32 increment(int32 amount) {
00091     return base::subtle::NoBarrier_AtomicIncrement(&value_, amount);
00092   }
00093 
00095   void set_value(int32 value) {
00096     base::subtle::Release_Store(&value_, value);
00097   }
00098 
00109   int32 CompareAndSwap(int32 expected_value, int32 new_value) {
00110     return base::subtle::Release_CompareAndSwap(
00111         &value_, expected_value, new_value);
00112   }
00113 
00114  private:
00115   base::subtle::AtomicWord value_;
00116   DISALLOW_COPY_AND_ASSIGN(AtomicInt32);
00117 };
00118 
00119 }  
00120 
00121 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_ATOMIC_INT32_H_
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