faa62fcf4b
git-svn-id: svn://10.0.0.236/branches/THREADS_20060213_BRANCH@190050 18797224-902f-48f8-a5cc-f745e15eee43
121 lines
3.3 KiB
C++
121 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla code.
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*
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* The Initial Developer of the Original Code is Google Inc.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Darin Fisher <darin@meer.net>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsTaskQueue.h"
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#include "nsAutoLock.h"
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#include "nsCOMPtr.h"
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nsTaskQueue::nsTaskQueue()
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: mMonitor(nsAutoMonitor::NewMonitor("xpcom.taskqueue"))
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, mHead(nsnull)
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, mTail(nsnull)
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, mOffsetHead(0)
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, mOffsetTail(0)
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{
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}
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nsTaskQueue::~nsTaskQueue()
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{
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nsAutoMonitor::DestroyMonitor(mMonitor);
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}
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PRBool
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nsTaskQueue::GetPendingTask(PRBool wait, nsIRunnable **result)
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{
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nsAutoMonitor mon(mMonitor);
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while (IsEmpty()) {
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if (!wait) {
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if (result)
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*result = nsnull;
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return PR_FALSE;
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}
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mon.Wait();
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}
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if (result)
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*result = mHead->mTasks[mOffsetHead++];
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// Check if mHead points to empty Page
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if (mOffsetHead == TASKS_PER_PAGE) {
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Page *dead = mHead;
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mHead = mHead->mNext;
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FreePage(dead);
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mOffsetHead = 0;
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}
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return PR_TRUE;
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}
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PRBool
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nsTaskQueue::PutTask(nsIRunnable *runnable)
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{
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// Avoid calling AddRef+Release while holding our monitor.
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nsCOMPtr<nsIRunnable> task(runnable);
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PRBool rv = PR_TRUE;
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{
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nsAutoMonitor mon(mMonitor);
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if (!mHead) {
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mHead = NewPage();
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if (!mHead) {
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rv = PR_FALSE;
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} else {
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mTail = mHead;
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mOffsetHead = 0;
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mOffsetTail = 0;
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}
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} else if (mOffsetTail == TASKS_PER_PAGE) {
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Page *page = NewPage();
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if (!page) {
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rv = PR_FALSE;
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} else {
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mTail->mNext = page;
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mTail = page;
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mOffsetTail = 0;
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}
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}
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if (rv) {
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task.swap(mTail->mTasks[mOffsetTail]);
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++mOffsetTail;
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mon.NotifyAll();
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}
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}
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return rv;
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}
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