Page Speed Optimization Libraries
1.4.26.1
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00001 /* 00002 * Copyright 2010 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_ABSTRACT_MUTEX_H_ 00020 #define NET_INSTAWEB_UTIL_PUBLIC_ABSTRACT_MUTEX_H_ 00021 00022 #include "net/instaweb/util/public/basictypes.h" 00023 00024 namespace net_instaweb { 00025 00027 class AbstractMutex { 00028 public: 00029 virtual ~AbstractMutex(); 00031 virtual bool TryLock() = 0; 00033 virtual void Lock() = 0; 00035 virtual void Unlock() = 0; 00038 virtual void DCheckLocked(); 00041 virtual void DCheckUnlocked(); 00042 }; 00043 00045 class ScopedMutex { 00046 public: 00047 explicit ScopedMutex(AbstractMutex* mutex) : mutex_(mutex) { 00048 mutex_->Lock(); 00049 } 00050 00051 void Release() { 00052 if (mutex_ != NULL) { 00053 mutex_->Unlock(); 00054 mutex_ = NULL; 00055 } 00056 } 00057 00058 ~ScopedMutex() { 00059 Release(); 00060 } 00061 00062 private: 00063 AbstractMutex* mutex_; 00064 00065 DISALLOW_COPY_AND_ASSIGN(ScopedMutex); 00066 }; 00069 #define ScopedMutex(x) COMPILE_ASSERT(0, mutex_lock_decl_missing_var_name) 00070 00071 } 00072 00073 #endif ///< NET_INSTAWEB_UTIL_PUBLIC_ABSTRACT_MUTEX_H_