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lightning-sunbird  0.9+nobinonly
imgThread.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
00002  *
00003  * ***** BEGIN LICENSE BLOCK *****
00004  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00005  *
00006  * The contents of this file are subject to the Mozilla Public License Version
00007  * 1.1 (the "License"); you may not use this file except in compliance with
00008  * the License. You may obtain a copy of the License at
00009  * http://www.mozilla.org/MPL/
00010  *
00011  * Software distributed under the License is distributed on an "AS IS" basis,
00012  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00013  * for the specific language governing rights and limitations under the
00014  * License.
00015  *
00016  * The Original Code is mozilla.org code.
00017  *
00018  * The Initial Developer of the Original Code is
00019  * Netscape Communications Corporation.
00020  * Portions created by the Initial Developer are Copyright (C) 2001
00021  * the Initial Developer. All Rights Reserved.
00022  *
00023  * Contributor(s):
00024  *   Stuart Parmenter <pavlov@netscape.com>
00025  *
00026  * Alternatively, the contents of this file may be used under the terms of
00027  * either the GNU General Public License Version 2 or later (the "GPL"), or
00028  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00029  * in which case the provisions of the GPL or the LGPL are applicable instead
00030  * of those above. If you wish to allow use of your version of this file only
00031  * under the terms of either the GPL or the LGPL, and not to allow others to
00032  * use your version of this file under the terms of the MPL, indicate your
00033  * decision by deleting the provisions above and replace them with the notice
00034  * and other provisions required by the GPL or the LGPL. If you do not delete
00035  * the provisions above, a recipient may use your version of this file under
00036  * the terms of any one of the MPL, the GPL or the LGPL.
00037  *
00038  * ***** END LICENSE BLOCK ***** */
00039 
00040 #include "imgThread.h"
00041 
00042 #include "nsIEventQueueService.h"
00043 
00044 #include "nsIComponentManager.h"
00045 #include "nsIServiceManager.h"
00046 
00047 #include "prlock.h"
00048 
00049 #include "nsAutoLock.h"
00050 
00051 NS_IMPL_THREADSAFE_ISUPPORTS1(imgThread, nsIRunnable)
00052 
00053 imgThread::imgThread()
00054 {
00055   /* member initializers and constructor code */
00056   mLock = PR_NewLock();
00057   mMonitor = PR_NewMonitor(); 
00058 }
00059 
00060 imgThread::~imgThread()
00061 {
00062   /* destructor code */
00063   PR_DestroyLock(mLock);
00064   PR_DestroyMonitor(mMonitor);
00065 }
00066 
00067 nsresult imgThread::Init()
00068 {
00069   if (!mThread) {
00070     nsresult rv = NS_NewThread(getter_AddRefs(mThread),
00071                                NS_STATIC_CAST(nsIRunnable*, this),
00072                                0,
00073                                PR_UNJOINABLE_THREAD,
00074                                PR_PRIORITY_NORMAL,
00075                                PR_GLOBAL_THREAD);
00076     if (NS_FAILED(rv))
00077       return rv;
00078   }
00079 
00080   return NS_OK;
00081 }
00082 
00083 nsresult imgThread::GetEventQueue(nsIEventQueue **aEventQueue)
00084 {
00085   PR_EnterMonitor(mMonitor);
00086 
00087   if (!mEventQueue)
00088     PR_Wait(mMonitor, PR_INTERVAL_NO_TIMEOUT);
00089 
00090   *aEventQueue = mEventQueue;
00091   NS_ADDREF(*aEventQueue);
00092 
00093   PR_ExitMonitor(mMonitor);
00094   return NS_OK;
00095 }
00096 
00097 
00100 /* void Run(); */
00101 NS_IMETHODIMP imgThread::Run()
00102 {
00103   nsresult rv;
00104 
00105   nsCOMPtr<nsIEventQueue> currentThreadQ;
00106 
00107   PR_EnterMonitor(mMonitor);
00108 
00109   nsCOMPtr<nsIEventQueueService> eventService(do_GetService("@mozilla.org/event-queue-service;1", &rv));
00110   if (NS_FAILED(rv)) return rv;
00111 
00112   rv = eventService->CreateMonitoredThreadEventQueue();
00113   if (NS_FAILED(rv)) return rv;
00114 
00115   rv = eventService->GetThreadEventQueue(NS_CURRENT_THREAD, getter_AddRefs(mEventQueue));
00116 
00117   NS_ASSERTION(NS_SUCCEEDED(rv), "unable to create event queue");
00118   if (NS_FAILED(rv)) return rv;
00119 
00120   PR_Notify(mMonitor);
00121 
00122   PR_ExitMonitor(mMonitor);
00123 
00124   PLEvent *event;
00125   while (1) {
00126      rv = mEventQueue->WaitForEvent(&event);
00127      if (NS_FAILED(rv)) return rv;
00128 
00129      rv = mEventQueue->HandleEvent(event);
00130      if (NS_FAILED(rv)) return rv;
00131   }
00132 
00133   rv = eventService->DestroyThreadEventQueue();
00134   if (NS_FAILED(rv)) return rv;
00135 
00136   mEventQueue = nsnull;
00137 
00138   return NS_OK;
00139 }