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140 lines
3.9 KiB
C++
140 lines
3.9 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 "nsEventQueue.h"
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#include "nsAutoPtr.h"
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#include "prlog.h"
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#include "nsThreadUtils.h"
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using namespace mozilla;
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#ifdef PR_LOGGING
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static PRLogModuleInfo *sLog = PR_NewLogModule("nsEventQueue");
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#endif
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#define LOG(args) PR_LOG(sLog, PR_LOG_DEBUG, args)
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nsEventQueue::nsEventQueue()
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: mReentrantMonitor("nsEventQueue.mReentrantMonitor")
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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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nsEventQueue::~nsEventQueue()
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{
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// It'd be nice to be able to assert that no one else is holding the monitor,
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// but NSPR doesn't really expose APIs for it.
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NS_ASSERTION(IsEmpty(), "Non-empty event queue being destroyed; events being leaked.");
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if (mHead)
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FreePage(mHead);
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}
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bool
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nsEventQueue::GetEvent(bool mayWait, nsIRunnable **result)
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{
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{
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ReentrantMonitorAutoEnter mon(mReentrantMonitor);
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while (IsEmpty()) {
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if (!mayWait) {
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if (result)
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*result = nsnull;
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return false;
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}
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LOG(("EVENTQ(%p): wait begin\n", this));
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mon.Wait();
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LOG(("EVENTQ(%p): wait end\n", this));
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}
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if (result) {
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*result = mHead->mEvents[mOffsetHead++];
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// Check if mHead points to empty Page
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if (mOffsetHead == EVENTS_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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}
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}
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return true;
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}
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bool
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nsEventQueue::PutEvent(nsIRunnable *runnable)
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{
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// Avoid calling AddRef+Release while holding our monitor.
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nsRefPtr<nsIRunnable> event(runnable);
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bool rv = true;
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{
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ReentrantMonitorAutoEnter mon(mReentrantMonitor);
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if (!mHead) {
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mHead = NewPage();
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if (!mHead) {
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rv = 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 == EVENTS_PER_PAGE) {
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Page *page = NewPage();
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if (!page) {
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rv = 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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event.swap(mTail->mEvents[mOffsetTail]);
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++mOffsetTail;
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LOG(("EVENTQ(%p): notify\n", this));
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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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