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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef CHROME_FRAME_SCOPED_INITIALIZATION_MANAGER_H_ | |
| 6 #define CHROME_FRAME_SCOPED_INITIALIZATION_MANAGER_H_ | |
| 7 | |
| 8 #include "base/basictypes.h" | |
| 9 #include "base/lazy_instance.h" | |
| 10 #include "base/synchronization/lock.h" | |
| 11 | |
| 12 namespace chrome_frame { | |
| 13 | |
| 14 // A class intended to be instantiated on the stack in a dyanmically loaded | |
| 15 // shared object to initialize and shutdown the object's dependencies. |Traits| | |
| 16 // must be a type with two public static void(void) functions named Initialize | |
| 17 // and Shutdown. Traits::Initialize will be invoked when the first instance of | |
| 18 // this class is created and Traits::Shutdown will be invoked when the last one | |
| 19 // is destroyed. | |
| 20 template<class Traits> | |
| 21 class ScopedInitializationManager { | |
| 22 public: | |
| 23 ScopedInitializationManager() { AddRef(); } | |
| 24 ~ScopedInitializationManager() { Release(); } | |
| 25 | |
| 26 private: | |
| 27 static void AddRef() { | |
| 28 base::AutoLock auto_lock(lock_.Get()); | |
| 29 DCHECK_LT(ref_count_, kuint32max); | |
| 30 if (++ref_count_ == 1) | |
| 31 Traits::Initialize(); | |
| 32 } | |
| 33 | |
| 34 static void Release() { | |
| 35 base::AutoLock auto_lock(lock_.Get()); | |
| 36 DCHECK_GT(ref_count_, 0U); | |
| 37 if (--ref_count_ == 0) | |
| 38 Traits::Shutdown(); | |
| 39 } | |
| 40 | |
| 41 static base::LazyInstance<base::Lock>::Leaky lock_; | |
| 42 static uint32 ref_count_; | |
| 43 DISALLOW_COPY_AND_ASSIGN(ScopedInitializationManager); | |
| 44 }; | |
| 45 | |
| 46 template<class Traits> base::LazyInstance<base::Lock>::Leaky | |
| 47 ScopedInitializationManager<Traits>::lock_ = LAZY_INSTANCE_INITIALIZER; | |
| 48 | |
| 49 template<class Traits> uint32 | |
| 50 ScopedInitializationManager<Traits>::ref_count_ = 0; | |
| 51 | |
| 52 } // namespace chrome_frame | |
| 53 | |
| 54 #endif // CHROME_FRAME_SCOPED_INITIALIZATION_MANAGER_H_ | |
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