michael@0: /* vim:set ts=4 sw=4 sts=4 et cin: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "nsProxyRelease.h"
michael@0: #include "nsThreadUtils.h"
michael@0: #include "nsAutoPtr.h"
michael@0: 
michael@0: class nsProxyReleaseEvent : public nsRunnable
michael@0: {
michael@0: public:
michael@0:     nsProxyReleaseEvent(nsISupports *doomed)
michael@0:         : mDoomed(doomed) {
michael@0:     }
michael@0: 
michael@0:     NS_IMETHOD Run()
michael@0:     {
michael@0:         mDoomed->Release();
michael@0:         return NS_OK;
michael@0:     }
michael@0: 
michael@0: private:
michael@0:     nsISupports *mDoomed;
michael@0: };
michael@0: 
michael@0: nsresult
michael@0: NS_ProxyRelease(nsIEventTarget *target, nsISupports *doomed,
michael@0:                 bool alwaysProxy)
michael@0: {
michael@0:     nsresult rv;
michael@0: 
michael@0:     if (!doomed) {
michael@0:         // nothing to do
michael@0:         return NS_OK;
michael@0:     }
michael@0: 
michael@0:     if (!target) {
michael@0:         NS_RELEASE(doomed);
michael@0:         return NS_OK;
michael@0:     }
michael@0: 
michael@0:     if (!alwaysProxy) {
michael@0:         bool onCurrentThread = false;
michael@0:         rv = target->IsOnCurrentThread(&onCurrentThread);
michael@0:         if (NS_SUCCEEDED(rv) && onCurrentThread) {
michael@0:             NS_RELEASE(doomed);
michael@0:             return NS_OK;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     nsRefPtr<nsIRunnable> ev = new nsProxyReleaseEvent(doomed);
michael@0:     if (!ev) {
michael@0:         // we do not release doomed here since it may cause a delete on the
michael@0:         // wrong thread.  better to leak than crash. 
michael@0:         return NS_ERROR_OUT_OF_MEMORY;
michael@0:     }
michael@0: 
michael@0:     rv = target->Dispatch(ev, NS_DISPATCH_NORMAL);
michael@0:     if (NS_FAILED(rv)) {
michael@0:         NS_WARNING("failed to post proxy release event");
michael@0:         // again, it is better to leak the doomed object than risk crashing as
michael@0:         // a result of deleting it on the wrong thread.
michael@0:     }
michael@0:     return rv;
michael@0: }