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abstract_mutex.h
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2  * Copyright 2010 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
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8  * http:///www.apache.org/licenses/LICENSE-2.0
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13  * See the License for the specific language governing permissions and
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16 
18 
19 #ifndef PAGESPEED_KERNEL_BASE_ABSTRACT_MUTEX_H_
20 #define PAGESPEED_KERNEL_BASE_ABSTRACT_MUTEX_H_
21 
23 #include "pagespeed/kernel/base/thread_annotations.h"
24 
25 namespace net_instaweb {
26 
28 class LOCKABLE AbstractMutex {
29  public:
30  virtual ~AbstractMutex();
32  virtual bool TryLock() EXCLUSIVE_TRYLOCK_FUNCTION(true) = 0;
34  virtual void Lock() EXCLUSIVE_LOCK_FUNCTION() = 0;
36  virtual void Unlock() UNLOCK_FUNCTION() = 0;
39  virtual void DCheckLocked();
42  virtual void DCheckUnlocked();
43 };
44 
46 class SCOPED_LOCKABLE ScopedMutex {
47  public:
48  explicit ScopedMutex(AbstractMutex* mutex) EXCLUSIVE_LOCK_FUNCTION(mutex)
49  : mutex_(mutex) {
50  mutex_->Lock();
51  }
52 
53  void Release() UNLOCK_FUNCTION() {
54  if (mutex_ != NULL) {
55  mutex_->Unlock();
56  mutex_ = NULL;
57  }
58  }
59 
60  ~ScopedMutex() UNLOCK_FUNCTION() { Release(); }
61 
62  private:
63  AbstractMutex* mutex_;
64 
65 
66 };
69 #define ScopedMutex(x) COMPILE_ASSERT(0, mutex_lock_decl_missing_var_name)
70 
71 }
72 
73 #endif
Abstract interface for implementing a mutex.
Definition: abstract_mutex.h:28
#define ScopedMutex(x)
Definition: abstract_mutex.h:69
Helper class for lexically scoped mutexing.
Definition: abstract_mutex.h:46