83 lines
2.2 KiB
C++
83 lines
2.2 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/at_exit.h"
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#include <stddef.h>
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#include <ostream>
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#include "base/bind.h"
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#include "base/callback.h"
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#include "base/logging.h"
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namespace base {
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// Keep a stack of registered AtExitManagers. We always operate on the most
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// recent, and we should never have more than one outside of testing (for a
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// statically linked version of this library). Testing may use the shadow
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// version of the constructor, and if we are building a dynamic library we may
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// end up with multiple AtExitManagers on the same process. We don't protect
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// this for thread-safe access, since it will only be modified in testing.
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static AtExitManager* g_top_manager = NULL;
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AtExitManager::AtExitManager() : next_manager_(g_top_manager) {
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// If multiple modules instantiate AtExitManagers they'll end up living in this
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// module... they have to coexist.
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#if !defined(COMPONENT_BUILD)
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DCHECK(!g_top_manager);
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#endif
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g_top_manager = this;
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}
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AtExitManager::~AtExitManager() {
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if (!g_top_manager) {
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NOTREACHED() << "Tried to ~AtExitManager without an AtExitManager";
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return;
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}
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DCHECK_EQ(this, g_top_manager);
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ProcessCallbacksNow();
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g_top_manager = next_manager_;
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}
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// static
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void AtExitManager::RegisterCallback(AtExitCallbackType func, void* param) {
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DCHECK(func);
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RegisterTask(base::Bind(func, param));
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}
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// static
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void AtExitManager::RegisterTask(base::Closure task) {
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if (!g_top_manager) {
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NOTREACHED() << "Tried to RegisterCallback without an AtExitManager";
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return;
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}
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AutoLock lock(g_top_manager->lock_);
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g_top_manager->stack_.push(task);
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}
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// static
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void AtExitManager::ProcessCallbacksNow() {
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if (!g_top_manager) {
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NOTREACHED() << "Tried to ProcessCallbacksNow without an AtExitManager";
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return;
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}
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AutoLock lock(g_top_manager->lock_);
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while (!g_top_manager->stack_.empty()) {
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base::Closure task = g_top_manager->stack_.top();
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task.Run();
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g_top_manager->stack_.pop();
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}
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}
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AtExitManager::AtExitManager(bool shadow) : next_manager_(g_top_manager) {
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DCHECK(shadow || !g_top_manager);
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g_top_manager = this;
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}
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} // namespace base
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