94 lines
2.2 KiB
C++
94 lines
2.2 KiB
C++
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// 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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// Ported by wrt(guangguang)
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// Date: 2013/09/17
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#include "base/util/at_exit.h"
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#include <stddef.h>
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#include <ostream>
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//#include "base/log/log.h"
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namespace nbase
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{
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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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{
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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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{
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if (!g_top_manager) {
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//LOG_ASS("Tried to ~AtExitManager without an AtExitManager");
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return;
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}
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//DCHECK(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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{
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//DCHECK(func);
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RegisterTask(nbase::Bind(func, param));
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}
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// static
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void AtExitManager::RegisterTask(StdClosure task)
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{
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if (!g_top_manager)
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{
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//LOG_ASS("Tried to RegisterCallback without an AtExitManager");
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return;
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}
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NAutoLock 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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{
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if (!g_top_manager)
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{
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//LOG_ASS("Tried to ProcessCallbacksNow without an AtExitManager");
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return;
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}
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NAutoLock lock(&g_top_manager->lock_);
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while (!g_top_manager->stack_.empty())
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{
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StdClosure task = g_top_manager->stack_.top();
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task();
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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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{
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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 nbase
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