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comparison: ipc/chromium/src/base/lazy_instance.cc
ipc/chromium/src/base/lazy_instance.cc
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| 1 // Copyright (c) 2008 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 #include "base/lazy_instance.h" | |
| 6 | |
| 7 #include "base/at_exit.h" | |
| 8 #include "base/atomicops.h" | |
| 9 #include "base/basictypes.h" | |
| 10 #include "base/platform_thread.h" | |
| 11 | |
| 12 namespace base { | |
| 13 | |
| 14 void LazyInstanceHelper::EnsureInstance(void* instance, | |
| 15 void (*ctor)(void*), | |
| 16 void (*dtor)(void*)) { | |
| 17 // Try to create the instance, if we're the first, will go from EMPTY | |
| 18 // to CREATING, otherwise we've already been beaten here. | |
| 19 if (base::subtle::Acquire_CompareAndSwap( | |
| 20 &state_, STATE_EMPTY, STATE_CREATING) == STATE_EMPTY) { | |
| 21 // Created the instance in the space provided by |instance|. | |
| 22 ctor(instance); | |
| 23 // Instance is created, go from CREATING to CREATED. | |
| 24 base::subtle::Release_Store(&state_, STATE_CREATED); | |
| 25 // Register the destructor callback with AtExitManager. | |
| 26 base::AtExitManager::RegisterCallback(dtor, instance); | |
| 27 } else { | |
| 28 // It's either in the process of being created, or already created. Spin. | |
| 29 while (base::subtle::NoBarrier_Load(&state_) != STATE_CREATED) | |
| 30 PlatformThread::YieldCurrentThread(); | |
| 31 } | |
| 32 } | |
| 33 | |
| 34 } // namespace base |
