Page Speed Optimization Libraries
1.2.24.1
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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_