LCOV - code coverage report
Current view: directory - xpcom/threads - nsEventQueue.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 52 50 96.2 %
Date: 2012-06-02 Functions: 7 6 85.7 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* vim:set ts=2 sw=2 sts=2 et cindent: */
       3                 : /* ***** BEGIN LICENSE BLOCK *****
       4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       5                 :  *
       6                 :  * The contents of this file are subject to the Mozilla Public License Version
       7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       8                 :  * the License. You may obtain a copy of the License at
       9                 :  * http://www.mozilla.org/MPL/
      10                 :  *
      11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      13                 :  * for the specific language governing rights and limitations under the
      14                 :  * License.
      15                 :  *
      16                 :  * The Original Code is Mozilla code.
      17                 :  *
      18                 :  * The Initial Developer of the Original Code is Google Inc.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 2006
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *  Darin Fisher <darin@meer.net>
      24                 :  *
      25                 :  * Alternatively, the contents of this file may be used under the terms of
      26                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      27                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      28                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      29                 :  * of those above. If you wish to allow use of your version of this file only
      30                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      31                 :  * use your version of this file under the terms of the MPL, indicate your
      32                 :  * decision by deleting the provisions above and replace them with the notice
      33                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      34                 :  * the provisions above, a recipient may use your version of this file under
      35                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      36                 :  *
      37                 :  * ***** END LICENSE BLOCK ***** */
      38                 : 
      39                 : #include "nsEventQueue.h"
      40                 : #include "nsAutoPtr.h"
      41                 : #include "prlog.h"
      42                 : #include "nsThreadUtils.h"
      43                 : 
      44                 : using namespace mozilla;
      45                 : 
      46                 : #ifdef PR_LOGGING
      47            1464 : static PRLogModuleInfo *sLog = PR_NewLogModule("nsEventQueue");
      48                 : #endif
      49                 : #define LOG(args) PR_LOG(sLog, PR_LOG_DEBUG, args)
      50                 : 
      51           10504 : nsEventQueue::nsEventQueue()
      52                 :   : mReentrantMonitor("nsEventQueue.mReentrantMonitor")
      53                 :   , mHead(nsnull)
      54                 :   , mTail(nsnull)
      55                 :   , mOffsetHead(0)
      56           10504 :   , mOffsetTail(0)
      57                 : {
      58           10504 : }
      59                 : 
      60           20978 : nsEventQueue::~nsEventQueue()
      61                 : {
      62                 :   // It'd be nice to be able to assert that no one else is holding the monitor,
      63                 :   // but NSPR doesn't really expose APIs for it.
      64           10489 :   NS_ASSERTION(IsEmpty(), "Non-empty event queue being destroyed; events being leaked.");
      65                 : 
      66           10489 :   if (mHead)
      67            7652 :     FreePage(mHead);
      68           10489 : }
      69                 : 
      70                 : bool
      71          814915 : nsEventQueue::GetEvent(bool mayWait, nsIRunnable **result)
      72                 : {
      73                 :   {
      74         1629834 :     ReentrantMonitorAutoEnter mon(mReentrantMonitor);
      75                 :     
      76         1689492 :     while (IsEmpty()) {
      77          212004 :       if (!mayWait) {
      78          152322 :         if (result)
      79           22903 :           *result = nsnull;
      80          152322 :         return false;
      81                 :       }
      82           59682 :       LOG(("EVENTQ(%p): wait begin\n", this)); 
      83           59682 :       mon.Wait();
      84           59682 :       LOG(("EVENTQ(%p): wait end\n", this)); 
      85                 :     }
      86                 :     
      87          662597 :     if (result) {
      88          293881 :       *result = mHead->mEvents[mOffsetHead++];
      89                 :       
      90                 :       // Check if mHead points to empty Page
      91          293881 :       if (mOffsetHead == EVENTS_PER_PAGE) {
      92             621 :         Page *dead = mHead;
      93             621 :         mHead = mHead->mNext;
      94             621 :         FreePage(dead);
      95             621 :         mOffsetHead = 0;
      96                 :       }
      97                 :     }
      98                 :   }
      99                 : 
     100          662601 :   return true;
     101                 : }
     102                 : 
     103                 : bool
     104          293883 : nsEventQueue::PutEvent(nsIRunnable *runnable)
     105                 : {
     106                 :   // Avoid calling AddRef+Release while holding our monitor.
     107          587765 :   nsRefPtr<nsIRunnable> event(runnable);
     108          293883 :   bool rv = true;
     109                 :   {
     110          587766 :     ReentrantMonitorAutoEnter mon(mReentrantMonitor);
     111                 : 
     112          293883 :     if (!mHead) {
     113            7965 :       mHead = NewPage();
     114            7965 :       if (!mHead) {
     115               0 :         rv = false;
     116                 :       } else {
     117            7965 :         mTail = mHead;
     118            7965 :         mOffsetHead = 0;
     119            7965 :         mOffsetTail = 0;
     120                 :       }
     121          285918 :     } else if (mOffsetTail == EVENTS_PER_PAGE) {
     122             319 :       Page *page = NewPage();
     123             319 :       if (!page) {
     124               0 :         rv = false;
     125                 :       } else {
     126             319 :         mTail->mNext = page;
     127             319 :         mTail = page;
     128             319 :         mOffsetTail = 0;
     129                 :       }
     130                 :     }
     131          293883 :     if (rv) {
     132          293883 :       event.swap(mTail->mEvents[mOffsetTail]);
     133          293883 :       ++mOffsetTail;
     134          293883 :       LOG(("EVENTQ(%p): notify\n", this)); 
     135          293883 :       mon.NotifyAll();
     136                 :     }
     137                 :   }
     138          293882 :   return rv;
     139            4392 : }

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