зеркало из https://github.com/mozilla/pjs.git
138 строки
4.5 KiB
C++
138 строки
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set sw=2 ts=8 et ft=cpp : */
|
|
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* The contents of this file are subject to the Mozilla Public License Version
|
|
* 1.1 (the "License"); you may not use this file except in compliance with
|
|
* the License. You may obtain a copy of the License at:
|
|
* http://www.mozilla.org/MPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|
* for the specific language governing rights and limitations under the
|
|
* License.
|
|
*
|
|
* The Original Code is Mozilla Code.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* The Mozilla Foundation
|
|
* Portions created by the Initial Developer are Copyright (C) 2011
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
* Justin Lebar <justin.lebar@gmail.com>
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either the GNU General Public License Version 2 or later (the "GPL"), or
|
|
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the MPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
#ifndef mozilla_ClearOnShutdown_h
|
|
|
|
#include <nsAutoPtr.h>
|
|
#include <nsCOMPtr.h>
|
|
#include <nsIObserver.h>
|
|
#include <nsIObserverService.h>
|
|
#include <mozilla/Services.h>
|
|
|
|
/*
|
|
* This header exports one method in the mozilla namespace:
|
|
*
|
|
* template<class SmartPtr>
|
|
* void ClearOnShutdown(SmartPtr *aPtr)
|
|
*
|
|
* This function takes a pointer to a smart pointer (i.e., nsCOMPtr<T>*,
|
|
* nsRefPtr<T>*, or nsAutoPtr<T>*) and nulls the smart pointer on shutdown.
|
|
*
|
|
* This is useful if you have a global smart pointer object which you don't
|
|
* want to "leak" on shutdown.
|
|
*
|
|
* There is no way to undo a call to ClearOnShutdown, so you can call it only
|
|
* on smart pointers which you know will live until the program shuts down.
|
|
*/
|
|
|
|
namespace mozilla {
|
|
namespace ClearOnShutdown_Internal {
|
|
|
|
template<class SmartPtr>
|
|
class ShutdownObserver : public nsIObserver
|
|
{
|
|
public:
|
|
ShutdownObserver(SmartPtr *aPtr)
|
|
: mPtr(aPtr)
|
|
{}
|
|
|
|
virtual ~ShutdownObserver()
|
|
{}
|
|
|
|
NS_DECL_ISUPPORTS
|
|
|
|
NS_IMETHOD Observe(nsISupports *aSubject, const char *aTopic,
|
|
const PRUnichar *aData)
|
|
{
|
|
MOZ_ASSERT(strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0);
|
|
|
|
if (mPtr) {
|
|
*mPtr = NULL;
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
private:
|
|
SmartPtr *mPtr;
|
|
};
|
|
|
|
// Give the full namespace in the NS_IMPL macros because NS_IMPL_ADDREF/RELEASE
|
|
// stringify the class name (using the "#" operator) and use this in
|
|
// trace-malloc. If we didn't fully-qualify the class name and someone else
|
|
// had a refcounted class named "ShutdownObserver<SmartPtr>" in any namespace,
|
|
// trace-malloc would assert (bug 711602).
|
|
//
|
|
// (Note that because macros happen before templates, trace-malloc sees this
|
|
// class name as "ShutdownObserver<SmartPtr>"; therefore, it would also assert
|
|
// if ShutdownObserver<T> had a different size than ShutdownObserver<S>.)
|
|
|
|
template<class SmartPtr>
|
|
NS_IMPL_ADDREF(mozilla::ClearOnShutdown_Internal::
|
|
ShutdownObserver<SmartPtr>)
|
|
|
|
template<class SmartPtr>
|
|
NS_IMPL_RELEASE(mozilla::ClearOnShutdown_Internal::
|
|
ShutdownObserver<SmartPtr>)
|
|
|
|
template<class SmartPtr>
|
|
NS_IMPL_QUERY_INTERFACE1(mozilla::ClearOnShutdown_Internal::
|
|
ShutdownObserver<SmartPtr>,
|
|
nsIObserver)
|
|
|
|
} // namespace ClearOnShutdown_Internal
|
|
|
|
template<class SmartPtr>
|
|
void ClearOnShutdown(SmartPtr *aPtr)
|
|
{
|
|
nsRefPtr<ClearOnShutdown_Internal::ShutdownObserver<SmartPtr> > observer =
|
|
new ClearOnShutdown_Internal::ShutdownObserver<SmartPtr>(aPtr);
|
|
|
|
nsCOMPtr<nsIObserverService> os = services::GetObserverService();
|
|
if (!os) {
|
|
NS_WARNING("Could not get observer service!");
|
|
return;
|
|
}
|
|
os->AddObserver(observer, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false);
|
|
}
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif
|