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Root/branches/xZenu/src/util/doxygen/qtools/qmutex.cpp

Source at commit 1322 created 9 years 5 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** $QT_BEGIN_LICENSE:LGPL$
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10** This file contains pre-release code and may not be distributed.
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13** Beta Release License Agreement.
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15** GNU Lesser General Public License Usage
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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
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28** GNU General Public License Usage
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30** General Public License version 3.0 as published by the Free Software
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40****************************************************************************/
41
42#include <stdio.h>
43
44#include "qglobal.h"
45
46#include "qmutex.h"
47#include "qmutex_p.h"
48
49QMutex::QMutex() : d(new QMutexPrivate())
50{
51}
52
53QMutex::~QMutex()
54{
55 delete d;
56}
57
58void 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
79bool QMutex::tryLock()
80{
81 bool isLocked = d->contenders == 0 &&
82 d->contenders.testAndSet(0, 1);
83 return isLocked;
84}
85
86void 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

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