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| 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 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 #include "base/lazy_instance.h" | 5 #include <stdbool.h> |
| 6 | 6 |
| 7 #include "base/at_exit.h" | 7 #include "base/at_exit.h" |
| 8 #include "base/atomicops.h" | 8 #include "base/atomicops_internals_x86_macosx.h" |
| 9 #include "base/basictypes.h" | 9 #include "base/lazy_instance.h" |
| 10 #include "base/third_party/dynamic_annotations/dynamic_annotations.h" |
| 10 #include "base/threading/platform_thread.h" | 11 #include "base/threading/platform_thread.h" |
| 11 #include "base/third_party/dynamic_annotations/dynamic_annotations.h" | |
| 12 | 12 |
| 13 namespace base { | 13 namespace base { |
| 14 | 14 |
| 15 bool LazyInstanceHelper::NeedsInstance() { | 15 bool LazyInstanceHelper::NeedsInstance() { |
| 16 // Try to create the instance, if we're the first, will go from EMPTY | 16 // Try to create the instance, if we're the first, will go from EMPTY |
| 17 // to CREATING, otherwise we've already been beaten here. | 17 // to CREATING, otherwise we've already been beaten here. |
| 18 if (base::subtle::Acquire_CompareAndSwap( | 18 if (base::subtle::Acquire_CompareAndSwap( |
| 19 &state_, STATE_EMPTY, STATE_CREATING) == STATE_EMPTY) { | 19 &state_, STATE_EMPTY, STATE_CREATING) == STATE_EMPTY) { |
| 20 // Caller must create instance | 20 // Caller must create instance |
| 21 return true; | 21 return true; |
| (...skipping 13 matching lines...) Expand all Loading... |
| 35 | 35 |
| 36 // Instance is created, go from CREATING to CREATED. | 36 // Instance is created, go from CREATING to CREATED. |
| 37 base::subtle::Release_Store(&state_, STATE_CREATED); | 37 base::subtle::Release_Store(&state_, STATE_CREATED); |
| 38 | 38 |
| 39 // Make sure that the lazily instantiated object will get destroyed at exit. | 39 // Make sure that the lazily instantiated object will get destroyed at exit. |
| 40 if (dtor) | 40 if (dtor) |
| 41 base::AtExitManager::RegisterCallback(dtor, instance); | 41 base::AtExitManager::RegisterCallback(dtor, instance); |
| 42 } | 42 } |
| 43 | 43 |
| 44 } // namespace base | 44 } // namespace base |
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