зеркало из https://github.com/mozilla/pjs.git
131 строка
3.9 KiB
C++
131 строка
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set sw=2 ts=8 et ft=cpp : */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at:
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Code.
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*
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* The Initial Developer of the Original Code is
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* The Mozilla Foundation
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Justin Lebar <justin.lebar@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef mozilla_ClearOnShutdown_h
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#define mozilla_ClearOnShutdown_h
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#include "mozilla/LinkedList.h"
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#include "nsThreadUtils.h"
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/*
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* This header exports one public method in the mozilla namespace:
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*
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* template<class SmartPtr>
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* void ClearOnShutdown(SmartPtr *aPtr)
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*
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* This function takes a pointer to a smart pointer (i.e., nsCOMPtr<T>*,
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* nsRefPtr<T>*, or nsAutoPtr<T>*) and nulls the smart pointer on shutdown.
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*
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* This is useful if you have a global smart pointer object which you don't
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* want to "leak" on shutdown.
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*
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* There is no way to undo a call to ClearOnShutdown, so you can call it only
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* on smart pointers which you know will live until the program shuts down.
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*
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* ClearOnShutdown is currently main-thread only because we don't want to
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* accidentally free an object from a different thread than the one it was
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* created on.
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*/
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namespace mozilla {
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namespace ClearOnShutdown_Internal {
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class ShutdownObserver : public LinkedListElement<ShutdownObserver>
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{
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public:
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virtual void Shutdown() = 0;
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};
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template<class SmartPtr>
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class PointerClearer : public ShutdownObserver
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{
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public:
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PointerClearer(SmartPtr *aPtr)
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: mPtr(aPtr)
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{}
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virtual void Shutdown()
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{
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if (mPtr) {
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*mPtr = NULL;
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}
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}
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private:
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SmartPtr *mPtr;
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};
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extern bool sHasShutDown;
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extern LinkedList<ShutdownObserver> sShutdownObservers;
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} // namespace ClearOnShutdown_Internal
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template<class SmartPtr>
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inline void ClearOnShutdown(SmartPtr *aPtr)
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{
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using namespace ClearOnShutdown_Internal;
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(!sHasShutDown);
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ShutdownObserver *observer = new PointerClearer<SmartPtr>(aPtr);
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sShutdownObservers.insertBack(observer);
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}
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// Called when XPCOM is shutting down, after all shutdown notifications have
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// been sent and after all threads' event loops have been purged.
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inline void KillClearOnShutdown()
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{
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using namespace ClearOnShutdown_Internal;
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MOZ_ASSERT(NS_IsMainThread());
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ShutdownObserver *observer;
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while ((observer = sShutdownObservers.popFirst())) {
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observer->Shutdown();
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delete observer;
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}
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sHasShutDown = true;
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}
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} // namespace mozilla
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#endif
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