Back to index

lightning-sunbird  0.9+nobinonly
nsPSMBackgroundThread.cpp
Go to the documentation of this file.
00001 /* ***** BEGIN LICENSE BLOCK *****
00002  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00003  *
00004  * The contents of this file are subject to the Mozilla Public License Version
00005  * 1.1 (the "License"); you may not use this file except in compliance with
00006  * the License. You may obtain a copy of the License at
00007  * http://www.mozilla.org/MPL/
00008  *
00009  * Software distributed under the License is distributed on an "AS IS" basis,
00010  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00011  * for the specific language governing rights and limitations under the
00012  * License.
00013  *
00014  * The Original Code is mozilla.org code.
00015  *
00016  * The Initial Developer of the Original Code is
00017  * Red Hat, Inc.
00018  * Portions created by the Initial Developer are Copyright (C) 2006
00019  * the Initial Developer. All Rights Reserved.
00020  *
00021  * Contributor(s):
00022  *   Kai Engert <kengert@redhat.com>
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
00029  * under the terms of either the GPL or the LGPL, and not to allow others to
00030  * use your version of this file under the terms of the MPL, indicate your
00031  * decision by deleting the provisions above and replace them with the notice
00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #include "nsPSMBackgroundThread.h"
00039 #include "nsAutoLock.h"
00040 
00041 void PR_CALLBACK nsPSMBackgroundThread::nsThreadRunner(void *arg)
00042 {
00043   nsPSMBackgroundThread *self = NS_STATIC_CAST(nsPSMBackgroundThread *, arg);
00044   self->Run();
00045 }
00046 
00047 nsPSMBackgroundThread::nsPSMBackgroundThread()
00048 : mThreadHandle(nsnull),
00049   mMutex(nsnull),
00050   mCond(nsnull),
00051   mExitRequested(PR_FALSE)
00052 {
00053   mMutex = PR_NewLock();
00054   mCond = PR_NewCondVar(mMutex);
00055 }
00056 
00057 nsresult nsPSMBackgroundThread::startThread()
00058 {
00059   if (!mMutex || !mCond)
00060     return NS_ERROR_OUT_OF_MEMORY;
00061 
00062   mThreadHandle = PR_CreateThread(PR_USER_THREAD, nsThreadRunner, NS_STATIC_CAST(void*, this), 
00063     PR_PRIORITY_NORMAL, PR_LOCAL_THREAD, PR_JOINABLE_THREAD, 0);
00064 
00065   NS_ASSERTION(mThreadHandle, "Could not create nsPSMBackgroundThread\n");
00066   
00067   if (!mThreadHandle)
00068     return NS_ERROR_OUT_OF_MEMORY;
00069 
00070   return NS_OK;
00071 }
00072 
00073 nsPSMBackgroundThread::~nsPSMBackgroundThread()
00074 {
00075   if (mCond)
00076     PR_DestroyCondVar(mCond);
00077 
00078   if (mMutex)
00079     PR_DestroyLock(mMutex);
00080 }
00081 
00082 void nsPSMBackgroundThread::requestExit()
00083 {
00084   if (!mThreadHandle)
00085     return;
00086 
00087   {
00088     nsAutoLock threadLock(mMutex);
00089 
00090     if (mExitRequested)
00091       return;
00092 
00093     mExitRequested = PR_TRUE;
00094     PR_NotifyAllCondVar(mCond);
00095   }
00096 
00097   PR_JoinThread(mThreadHandle);
00098   mThreadHandle = nsnull;
00099 }