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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // The LazyInstance<Type, Traits> class manages a single instance of Type, | 5 // The LazyInstance<Type, Traits> class manages a single instance of Type, |
6 // which will be lazily created on the first time it's accessed. This class is | 6 // which will be lazily created on the first time it's accessed. This class is |
7 // useful for places you would normally use a function-level static, but you | 7 // useful for places you would normally use a function-level static, but you |
8 // need to have guaranteed thread-safety. The Type constructor will only ever | 8 // need to have guaranteed thread-safety. The Type constructor will only ever |
9 // be called once, even if two threads are racing to create the object. Get() | 9 // be called once, even if two threads are racing to create the object. Get() |
10 // and Pointer() will always return the same, completely initialized instance. | 10 // and Pointer() will always return the same, completely initialized instance. |
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33 // } | 33 // } |
34 | 34 |
35 #ifndef BASE_LAZY_INSTANCE_H_ | 35 #ifndef BASE_LAZY_INSTANCE_H_ |
36 #define BASE_LAZY_INSTANCE_H_ | 36 #define BASE_LAZY_INSTANCE_H_ |
37 | 37 |
38 #include <new> // For placement new. | 38 #include <new> // For placement new. |
39 | 39 |
40 #include "base/atomicops.h" | 40 #include "base/atomicops.h" |
41 #include "base/base_export.h" | 41 #include "base/base_export.h" |
42 #include "base/debug/leak_annotations.h" | 42 #include "base/debug/leak_annotations.h" |
43 #include "base/lazy_instance.h" | |
grt (UTC plus 2)
2016/07/25 10:57:10
ping
chrisha
2016/07/26 21:21:17
Doh!
| |
43 #include "base/logging.h" | 44 #include "base/logging.h" |
44 #include "base/memory/aligned_memory.h" | 45 #include "base/memory/aligned_memory.h" |
45 #include "base/threading/thread_restrictions.h" | 46 #include "base/threading/thread_restrictions.h" |
46 | 47 |
47 // LazyInstance uses its own struct initializer-list style static | 48 // LazyInstance uses its own struct initializer-list style static |
48 // initialization, as base's LINKER_INITIALIZED requires a constructor and on | 49 // initialization, as base's LINKER_INITIALIZED requires a constructor and on |
49 // some compilers (notably gcc 4.4) this still ends up needing runtime | 50 // some compilers (notably gcc 4.4) this still ends up needing runtime |
50 // initialization. | 51 // initialization. |
51 #define LAZY_INSTANCE_INITIALIZER {0} | 52 #define LAZY_INSTANCE_INITIALIZER {0} |
52 | 53 |
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198 LazyInstance<Type, Traits>* me = | 199 LazyInstance<Type, Traits>* me = |
199 reinterpret_cast<LazyInstance<Type, Traits>*>(lazy_instance); | 200 reinterpret_cast<LazyInstance<Type, Traits>*>(lazy_instance); |
200 Traits::Delete(me->instance()); | 201 Traits::Delete(me->instance()); |
201 subtle::NoBarrier_Store(&me->private_instance_, 0); | 202 subtle::NoBarrier_Store(&me->private_instance_, 0); |
202 } | 203 } |
203 }; | 204 }; |
204 | 205 |
205 } // namespace base | 206 } // namespace base |
206 | 207 |
207 #endif // BASE_LAZY_INSTANCE_H_ | 208 #endif // BASE_LAZY_INSTANCE_H_ |
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