gecko-dev/xpcom/glue/nsProxyRelease.cpp

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/* vim:set ts=4 sw=4 sts=4 et cin: */
/* ***** 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.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2003
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@meer.net>
*
* 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 ***** */
#include "nsProxyRelease.h"
#include "nsThreadUtils.h"
#include "nsAutoPtr.h"
class nsProxyReleaseEvent : public nsRunnable
{
public:
nsProxyReleaseEvent(nsISupports *doomed)
: mDoomed(doomed) {
}
NS_IMETHOD Run()
{
mDoomed->Release();
return NS_OK;
}
private:
nsISupports *mDoomed;
};
nsresult
NS_ProxyRelease(nsIEventTarget *target, nsISupports *doomed,
bool alwaysProxy)
{
nsresult rv;
if (!target) {
NS_RELEASE(doomed);
return NS_OK;
}
if (!alwaysProxy) {
bool onCurrentThread = false;
rv = target->IsOnCurrentThread(&onCurrentThread);
if (NS_SUCCEEDED(rv) && onCurrentThread) {
NS_RELEASE(doomed);
return NS_OK;
}
}
nsRefPtr<nsIRunnable> ev = new nsProxyReleaseEvent(doomed);
if (!ev) {
// we do not release doomed here since it may cause a delete on the
// wrong thread. better to leak than crash.
return NS_ERROR_OUT_OF_MEMORY;
}
rv = target->Dispatch(ev, NS_DISPATCH_NORMAL);
if (NS_FAILED(rv)) {
NS_WARNING("failed to post proxy release event");
// again, it is better to leak the doomed object than risk crashing as
// a result of deleting it on the wrong thread.
}
return rv;
}