1 // Copyright (c) 2006-2008 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/at_exit.h" 6 #include "base/logging.h" 7 8 namespace base { 9 10 // Keep a stack of registered AtExitManagers. We always operate on the most 11 // recent, and we should never have more than one outside of testing, when we 12 // use the shadow version of the constructor. We don't protect this for 13 // thread-safe access, since it will only be modified in testing. 14 static AtExitManager* g_top_manager = NULL; 15 AtExitManager()16AtExitManager::AtExitManager() : next_manager_(NULL) { 17 DCHECK(!g_top_manager); 18 g_top_manager = this; 19 } 20 AtExitManager(bool shadow)21AtExitManager::AtExitManager(bool shadow) : next_manager_(g_top_manager) { 22 DCHECK(shadow || !g_top_manager); 23 g_top_manager = this; 24 } 25 ~AtExitManager()26AtExitManager::~AtExitManager() { 27 if (!g_top_manager) { 28 NOTREACHED() << "Tried to ~AtExitManager without an AtExitManager"; 29 return; 30 } 31 DCHECK(g_top_manager == this); 32 33 ProcessCallbacksNow(); 34 g_top_manager = next_manager_; 35 } 36 37 // static RegisterCallback(AtExitCallbackType func,void * param)38void AtExitManager::RegisterCallback(AtExitCallbackType func, void* param) { 39 if (!g_top_manager) { 40 NOTREACHED() << "Tried to RegisterCallback without an AtExitManager"; 41 return; 42 } 43 44 DCHECK(func); 45 46 AutoLock lock(g_top_manager->lock_); 47 g_top_manager->stack_.push(CallbackAndParam(func, param)); 48 } 49 50 // static ProcessCallbacksNow()51void AtExitManager::ProcessCallbacksNow() { 52 if (!g_top_manager) { 53 NOTREACHED() << "Tried to ProcessCallbacksNow without an AtExitManager"; 54 return; 55 } 56 57 AutoLock lock(g_top_manager->lock_); 58 59 while (!g_top_manager->stack_.empty()) { 60 CallbackAndParam callback_and_param = g_top_manager->stack_.top(); 61 g_top_manager->stack_.pop(); 62 63 callback_and_param.func_(callback_and_param.param_); 64 } 65 } 66 67 } // namespace base 68