15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2011 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/at_exit.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <stddef.h> 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <ostream> 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/bind.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/callback.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace base { 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Keep a stack of registered AtExitManagers. We always operate on the most 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// recent, and we should never have more than one outside of testing (for a 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// statically linked version of this library). Testing may use the shadow 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// version of the constructor, and if we are building a dynamic library we may 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// end up with multiple AtExitManagers on the same process. We don't protect 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// this for thread-safe access, since it will only be modified in testing. 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static AtExitManager* g_top_manager = NULL; 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AtExitManager::AtExitManager() : next_manager_(g_top_manager) { 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// If multiple modules instantiate AtExitManagers they'll end up living in this 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// module... they have to coexist. 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if !defined(COMPONENT_BUILD) 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!g_top_manager); 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) g_top_manager = this; 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AtExitManager::~AtExitManager() { 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!g_top_manager) { 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "Tried to ~AtExitManager without an AtExitManager"; 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_EQ(this, g_top_manager); 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ProcessCallbacksNow(); 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) g_top_manager = next_manager_; 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// static 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AtExitManager::RegisterCallback(AtExitCallbackType func, void* param) { 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(func); 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RegisterTask(base::Bind(func, param)); 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// static 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AtExitManager::RegisterTask(base::Closure task) { 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!g_top_manager) { 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "Tried to RegisterCallback without an AtExitManager"; 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AutoLock lock(g_top_manager->lock_); 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) g_top_manager->stack_.push(task); 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// static 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AtExitManager::ProcessCallbacksNow() { 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!g_top_manager) { 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "Tried to ProcessCallbacksNow without an AtExitManager"; 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AutoLock lock(g_top_manager->lock_); 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (!g_top_manager->stack_.empty()) { 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::Closure task = g_top_manager->stack_.top(); 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) task.Run(); 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) g_top_manager->stack_.pop(); 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AtExitManager::AtExitManager(bool shadow) : next_manager_(g_top_manager) { 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(shadow || !g_top_manager); 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) g_top_manager = this; 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace base 83