gecko-dev/xpcom/proxy/tests/proxy-create-threadsafety.cpp

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** 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.org code.
*
* The Initial Developer of the Original Code is
* Mark 'Mook' Yen <mook@songbirdnest.com>
* Portions created by the Initial Developer are Copyright (C) 2008
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 <stdio.h>
#include "nsXPCOM.h"
#include "nsXPCOMCIDInternal.h"
#include "nsIComponentManager.h"
#include "nsIComponentRegistrar.h"
#include "nsIServiceManager.h"
#include "nsAutoPtr.h"
#include "nsCOMPtr.h"
#include "nscore.h"
#include "nspr.h"
#include "nsITestProxy.h"
#include "nsISupportsPrimitives.h"
#include "mozilla/ReentrantMonitor.h"
#include "mozilla/Mutex.h"
#include "nsIRunnable.h"
#include "nsIProxyObjectManager.h"
#include "nsXPCOMCIDInternal.h"
#include "nsComponentManagerUtils.h"
#include "nsServiceManagerUtils.h"
#include "nsThreadUtils.h"
#include "nsISupportsUtils.h"
using namespace mozilla;
/*
A quick diagram of how this test works:
This tests for bug 400450, where the creation of a proxy event object
causes a deadlock. We use a counter and a monitor to make things
be more deterministic.
The leftmost column marks the thread that is running.
M Create two threads
1 Get a proxy
1 proxy event object created
1 (Proxy object QIs the target)
1 Lock [*]
2 Get a proxy
2 proxy event object created
2 (Proxy object calls QI)
2 Unlock [*]
2 proxy event object stored
2 proxy obtained
1 proxy event object released
*/
/***************************************************************************/
/* ProxyTest */
/***************************************************************************/
class ProxyTest : public nsIRunnable,
public nsITestProxy,
public nsISupportsPrimitive
{
public:
ProxyTest()
: mCounterLock("ProxyTest.mCounterLock")
, mEvilReentrantMonitor("ProxyTest.mEvilReentrantMonitor")
, mCounter(0)
{}
NS_IMETHOD Run()
{
nsresult rv;
nsCOMPtr<nsIProxyObjectManager> pom =
do_GetService(NS_XPCOMPROXY_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsISupportsPrimitive> prim;
rv = pom->GetProxyForObject(NS_PROXY_TO_MAIN_THREAD,
NS_GET_IID(nsISupportsPrimitive),
NS_ISUPPORTS_CAST(nsIRunnable*, this),
NS_PROXY_SYNC | NS_PROXY_ALWAYS,
getter_AddRefs(prim));
NS_ENSURE_SUCCESS(rv, rv);
/* we don't actually need to use the proxied object */
return NS_OK;
}
NS_IMETHOD Test(PRInt32 p1, PRInt32 p2, PRInt32 *_retval)
{
nsresult rv;
if (!NS_IsMainThread())
return NS_ERROR_UNEXPECTED;
/* note that we don't have an event queue... */
rv = NS_NewThread(getter_AddRefs(mThreadOne),
static_cast<nsIRunnable*>(this));
NS_ENSURE_SUCCESS(rv, rv);
rv = NS_NewThread(getter_AddRefs(mThreadTwo),
static_cast<nsIRunnable*>(this));
NS_ENSURE_SUCCESS(rv, rv);
rv = mThreadOne->Shutdown();
NS_ENSURE_SUCCESS(rv, rv);
rv = mThreadTwo->Shutdown();
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
NS_IMETHOD Test2(void)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHOD Test3(nsISupports *p1, nsISupports **p2)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHOD GetType(PRUint16 *_retval)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr)
{
NS_ASSERTION(aInstancePtr,
"QueryInterface requires a non-NULL destination!");
nsISupports* foundInterface;
if ( aIID.Equals(NS_GET_IID(nsIRunnable)) ) {
foundInterface = static_cast<nsIRunnable*>(this);
} else if ( aIID.Equals(NS_GET_IID(nsITestProxy)) ) {
foundInterface = static_cast<nsITestProxy*>(this);
} else if ( aIID.Equals(NS_GET_IID(nsISupports)) ) {
foundInterface = NS_ISUPPORTS_CAST(nsIRunnable*, this);
} else if ( aIID.Equals(NS_GET_IID(nsISupportsPrimitive)) ) {
{
MutexAutoLock counterLock(mCounterLock);
switch(mCounter) {
case 0:
++mCounter;
{
/* be evil here and hang */
MutexAutoUnlock counterUnlock(mCounterLock);
ReentrantMonitorAutoEnter evilReentrantMonitor(mEvilReentrantMonitor);
nsresult rv = evilReentrantMonitor.Wait();
NS_ENSURE_SUCCESS(rv, rv);
break;
}
case 1:
++mCounter;
{
/* okay, we had our fun, un-hang */
MutexAutoUnlock counterUnlock(mCounterLock);
ReentrantMonitorAutoEnter evilReentrantMonitor(mEvilReentrantMonitor);
nsresult rv = evilReentrantMonitor.Notify();
NS_ENSURE_SUCCESS(rv, rv);
break;
}
default: {
/* nothing special here */
++mCounter;
}
}
++mCounter;
}
// remeber to admit to supporting this interface
foundInterface = static_cast<nsISupportsPrimitive*>(this);
} else {
foundInterface = nsnull;
}
nsresult status;
if (!foundInterface) {
status = NS_ERROR_NO_INTERFACE;
} else {
NS_ADDREF(foundInterface);
status = NS_OK;
}
*aInstancePtr = foundInterface;
return status;
}
NS_IMETHOD_(nsrefcnt) AddRef(void);
NS_IMETHOD_(nsrefcnt) Release(void);
protected:
nsAutoRefCnt mRefCnt;
NS_DECL_OWNINGTHREAD
private:
Mutex mCounterLock;
ReentrantMonitor mEvilReentrantMonitor;
PRInt32 mCounter;
nsCOMPtr<nsIThread> mThreadOne;
nsCOMPtr<nsIThread> mThreadTwo;
};
NS_IMPL_THREADSAFE_ADDREF(ProxyTest)
NS_IMPL_THREADSAFE_RELEASE(ProxyTest)
int
main(int argc, char **argv)
{
NS_InitXPCOM2(nsnull, nsnull, nsnull);
// Scope code so everything is destroyed before we run call NS_ShutdownXPCOM
{
nsCOMPtr<nsITestProxy> tester = new ProxyTest();
tester->Test(0, 0, nsnull);
}
NS_ShutdownXPCOM(nsnull);
return 0;
}