Page Speed Optimization Libraries  1.5.27.2
net/instaweb/util/public/abstract_mutex.h
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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_
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