Root/
Source at commit 1322 created 12 years 7 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 |