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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.
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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.
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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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41
42#include <errno.h>
43#include <pthread.h>
44
45#include "qglobal.h"
46#include "qmutex.h"
47#include "qmutex_p.h"
48
49static pthread_mutex_t qAtomicMutex = PTHREAD_MUTEX_INITIALIZER;
50
51static void report_error(int code, const char *where, const char *what)
52{
53 if (code != 0)
54 qWarning("%s: %s failure: %d", where, what, code);
55}
56
57
58QMutexPrivate::QMutexPrivate()
59 : contenders(0), wakeup(FALSE)
60{
61 report_error(pthread_mutex_init(&mutex, NULL), "QMutex", "mutex init");
62 report_error(pthread_cond_init(&cond, NULL), "QMutex", "cv init");
63}
64
65QMutexPrivate::~QMutexPrivate()
66{
67 report_error(pthread_cond_destroy(&cond), "QMutex", "cv destroy");
68 report_error(pthread_mutex_destroy(&mutex), "QMutex", "mutex destroy");
69}
70
71void QMutexPrivate::wait()
72{
73 report_error(pthread_mutex_lock(&mutex), "QMutex::lock", "mutex lock");
74 int errorCode = 0;
75 while (!wakeup)
76 {
77 errorCode = pthread_cond_wait(&cond, &mutex);
78 if (errorCode)
79 {
80 report_error(errorCode, "QMutex::lock()", "cv wait");
81 }
82 }
83 wakeup = FALSE;
84 report_error(pthread_mutex_unlock(&mutex), "QMutex::lock", "mutex unlock");
85}
86
87void QMutexPrivate::wakeUp()
88{
89 report_error(pthread_mutex_lock(&mutex), "QMutex::unlock", "mutex lock");
90 wakeup = TRUE;
91 report_error(pthread_cond_signal(&cond), "QMutex::unlock", "cv signal");
92 report_error(pthread_mutex_unlock(&mutex), "QMutex::unlock", "mutex unlock");
93}
94
95bool QAtomicInt::testAndSet(int expectedValue,int newValue)
96{
97 bool returnValue = false;
98 pthread_mutex_lock(&qAtomicMutex);
99 if (m_value == expectedValue)
100 {
101 m_value = newValue;
102 returnValue = true;
103 }
104 pthread_mutex_unlock(&qAtomicMutex);
105 return returnValue;
106}
107
108int QAtomicInt::fetchAndAdd(int valueToAdd)
109{
110 int returnValue;
111 pthread_mutex_lock(&qAtomicMutex);
112 returnValue = m_value;
113 m_value += valueToAdd;
114 pthread_mutex_unlock(&qAtomicMutex);
115 return returnValue;
116}
117
118

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