gecko-dev/xpcom/glue/nsProxyRelease.cpp

66 lines
1.6 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsProxyRelease.h"
#include "nsThreadUtils.h"
#include "nsAutoPtr.h"
class nsProxyReleaseEvent : public nsRunnable
{
public:
nsProxyReleaseEvent(nsISupports* aDoomed) : mDoomed(aDoomed) {}
NS_IMETHOD Run()
{
mDoomed->Release();
return NS_OK;
}
private:
nsISupports* mDoomed;
};
nsresult
NS_ProxyRelease(nsIEventTarget* aTarget, nsISupports* aDoomed,
bool aAlwaysProxy)
{
nsresult rv;
if (!aDoomed) {
// nothing to do
return NS_OK;
}
if (!aTarget) {
NS_RELEASE(aDoomed);
return NS_OK;
}
if (!aAlwaysProxy) {
bool onCurrentThread = false;
rv = aTarget->IsOnCurrentThread(&onCurrentThread);
if (NS_SUCCEEDED(rv) && onCurrentThread) {
NS_RELEASE(aDoomed);
return NS_OK;
}
}
nsRefPtr<nsIRunnable> ev = new nsProxyReleaseEvent(aDoomed);
if (!ev) {
// we do not release aDoomed here since it may cause a delete on the
// wrong thread. better to leak than crash.
return NS_ERROR_OUT_OF_MEMORY;
}
rv = aTarget->Dispatch(ev, NS_DISPATCH_NORMAL);
if (NS_FAILED(rv)) {
NS_WARNING("failed to post proxy release event");
// again, it is better to leak the aDoomed object than risk crashing as
// a result of deleting it on the wrong thread.
}
return rv;
}