Root/
| Source at commit 1322 created 12 years 8 months ago. By meklort, Add doxygen to utils folder | |
|---|---|
| 1 | /****************************************************************************␊ |
| 2 | **␊ |
| 3 | ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).␊ |
| 4 | ** Contact: Nokia Corporation (qt-info@nokia.com)␊ |
| 5 | **␊ |
| 6 | ** This file is part of the QtCore module of the Qt Toolkit.␊ |
| 7 | **␊ |
| 8 | ** $QT_BEGIN_LICENSE:LGPL$␊ |
| 9 | ** No Commercial Usage␊ |
| 10 | ** This file contains pre-release code and may not be distributed.␊ |
| 11 | ** You may use this file in accordance with the terms and conditions␊ |
| 12 | ** contained in the either Technology Preview License Agreement or the␊ |
| 13 | ** Beta Release License Agreement.␊ |
| 14 | **␊ |
| 15 | ** GNU Lesser General Public License Usage␊ |
| 16 | ** Alternatively, this file may be used under the terms of the GNU Lesser␊ |
| 17 | ** General Public License version 2.1 as published by the Free Software␊ |
| 18 | ** Foundation and appearing in the file LICENSE.LGPL included in the␊ |
| 19 | ** packaging of this file. Please review the following information to␊ |
| 20 | ** ensure the GNU Lesser General Public License version 2.1 requirements␊ |
| 21 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.␊ |
| 22 | **␊ |
| 23 | ** In addition, as a special exception, Nokia gives you certain␊ |
| 24 | ** additional rights. These rights are described in the Nokia Qt LGPL␊ |
| 25 | ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this␊ |
| 26 | ** package.␊ |
| 27 | **␊ |
| 28 | ** GNU General Public License Usage␊ |
| 29 | ** Alternatively, this file may be used under the terms of the GNU␊ |
| 30 | ** General Public License version 3.0 as published by the Free Software␊ |
| 31 | ** Foundation and appearing in the file LICENSE.GPL included in the␊ |
| 32 | ** packaging of this file. Please review the following information to␊ |
| 33 | ** ensure the GNU General Public License version 3.0 requirements will be␊ |
| 34 | ** met: http://www.gnu.org/copyleft/gpl.html.␊ |
| 35 | **␊ |
| 36 | ** If you are unsure which license is appropriate for your use, please␊ |
| 37 | ** contact the sales department at http://www.qtsoftware.com/contact.␊ |
| 38 | ** $QT_END_LICENSE$␊ |
| 39 | **␊ |
| 40 | ****************************************************************************/␊ |
| 41 | ␊ |
| 42 | #include <stdio.h>␊ |
| 43 | ␊ |
| 44 | #include "qglobal.h"␊ |
| 45 | ␊ |
| 46 | #include "qmutex.h"␊ |
| 47 | #include "qmutex_p.h"␊ |
| 48 | ␊ |
| 49 | QMutex::QMutex() : d(new QMutexPrivate())␊ |
| 50 | {␊ |
| 51 | }␊ |
| 52 | ␊ |
| 53 | QMutex::~QMutex()␊ |
| 54 | {␊ |
| 55 | delete d;␊ |
| 56 | }␊ |
| 57 | ␊ |
| 58 | void QMutex::lock()␊ |
| 59 | {␊ |
| 60 | //printf("%p: QMutex::lock(): enter\n",this);␊ |
| 61 | bool isLocked;␊ |
| 62 | isLocked = d->contenders == 0 && d->contenders.testAndSet(0, 1);␊ |
| 63 | if (!isLocked)␊ |
| 64 | {␊ |
| 65 | isLocked = d->contenders.fetchAndAdd(1)==0;␊ |
| 66 | if (!isLocked)␊ |
| 67 | {␊ |
| 68 | // didn't get the lock, wait for it␊ |
| 69 | //printf("%p: QMutex::lock(): wait() %d\n",this,(int)d->contenders);␊ |
| 70 | d->wait();␊ |
| 71 | ␊ |
| 72 | // release lock␊ |
| 73 | d->contenders.fetchAndAdd(-1);␊ |
| 74 | }␊ |
| 75 | }␊ |
| 76 | //printf("%p: QMutex::lock(): leave\n",this);␊ |
| 77 | }␊ |
| 78 | ␊ |
| 79 | bool QMutex::tryLock()␊ |
| 80 | {␊ |
| 81 | bool isLocked = d->contenders == 0 &&␊ |
| 82 | d->contenders.testAndSet(0, 1);␊ |
| 83 | return isLocked;␊ |
| 84 | }␊ |
| 85 | ␊ |
| 86 | void QMutex::unlock()␊ |
| 87 | {␊ |
| 88 | //printf("%p: QMutex::unlock(): enter %d\n",this,(int)d->contenders);␊ |
| 89 | if (!d->contenders.testAndSet(1, 0))␊ |
| 90 | {␊ |
| 91 | //printf("%p: QMutex::unlock(): wakeUp()\n",this);␊ |
| 92 | d->wakeUp();␊ |
| 93 | }␊ |
| 94 | //printf("%p: QMutex::unlock(): leave\n",this);␊ |
| 95 | }␊ |
| 96 | ␊ |
| 97 | |
