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[email protected]2edc2862011-04-04 18:04:371// Copyright (c) 2011 The Chromium Authors. All rights reserved.
[email protected]b2e97292008-09-02 18:20:342// 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"
[email protected]2edc2862011-04-04 18:04:376
7#include <stddef.h>
8#include <ostream>
9
[email protected]b2e97292008-09-02 18:20:3410#include "base/logging.h"
11
12namespace base {
13
14// Keep a stack of registered AtExitManagers. We always operate on the most
[email protected]5ceb1b02011-04-22 22:09:3515// recent, and we should never have more than one outside of testing (for a
16// statically linked version of this library). Testing may use the shadow
17// version of the constructor, and if we are building a dynamic library we may
18// end up with multiple AtExitManagers on the same process. We don't protect
19// this for thread-safe access, since it will only be modified in testing.
[email protected]b2e97292008-09-02 18:20:3420static AtExitManager* g_top_manager = NULL;
21
[email protected]5ceb1b02011-04-22 22:09:3522AtExitManager::AtExitManager() : next_manager_(g_top_manager) {
23// If multiple modules instantiate AtExitManagers they'll end up living in this
24// module... they have to coexist.
[email protected]63e39a282011-07-13 20:41:2825#if !defined(COMPONENT_BUILD)
[email protected]b2e97292008-09-02 18:20:3426 DCHECK(!g_top_manager);
[email protected]5ceb1b02011-04-22 22:09:3527#endif
[email protected]b2e97292008-09-02 18:20:3428 g_top_manager = this;
29}
30
[email protected]b2e97292008-09-02 18:20:3431AtExitManager::~AtExitManager() {
32 if (!g_top_manager) {
33 NOTREACHED() << "Tried to ~AtExitManager without an AtExitManager";
34 return;
35 }
[email protected]5e0be642011-04-28 18:20:0936 DCHECK_EQ(this, g_top_manager);
[email protected]b2e97292008-09-02 18:20:3437
38 ProcessCallbacksNow();
39 g_top_manager = next_manager_;
40}
41
42// static
[email protected]9795ec12008-09-08 09:06:5143void AtExitManager::RegisterCallback(AtExitCallbackType func, void* param) {
[email protected]b2e97292008-09-02 18:20:3444 if (!g_top_manager) {
45 NOTREACHED() << "Tried to RegisterCallback without an AtExitManager";
46 return;
47 }
48
[email protected]9795ec12008-09-08 09:06:5149 DCHECK(func);
50
[email protected]b2e97292008-09-02 18:20:3451 AutoLock lock(g_top_manager->lock_);
[email protected]9795ec12008-09-08 09:06:5152 g_top_manager->stack_.push(CallbackAndParam(func, param));
[email protected]b2e97292008-09-02 18:20:3453}
54
55// static
56void AtExitManager::ProcessCallbacksNow() {
57 if (!g_top_manager) {
58 NOTREACHED() << "Tried to ProcessCallbacksNow without an AtExitManager";
59 return;
60 }
61
62 AutoLock lock(g_top_manager->lock_);
63
64 while (!g_top_manager->stack_.empty()) {
[email protected]9795ec12008-09-08 09:06:5165 CallbackAndParam callback_and_param = g_top_manager->stack_.top();
[email protected]b2e97292008-09-02 18:20:3466 g_top_manager->stack_.pop();
[email protected]9795ec12008-09-08 09:06:5167
68 callback_and_param.func_(callback_and_param.param_);
[email protected]b2e97292008-09-02 18:20:3469 }
70}
71
[email protected]eae9c062011-01-11 00:50:5972AtExitManager::AtExitManager(bool shadow) : next_manager_(g_top_manager) {
73 DCHECK(shadow || !g_top_manager);
74 g_top_manager = this;
75}
76
[email protected]b2e97292008-09-02 18:20:3477} // namespace base