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Source at commit 1322 created 9 years 5 months ago.
By meklort, Add doxygen to utils folder
1/****************************************************************************
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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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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
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41
42#include "qwaitcondition.h"
43#include "qmutex.h"
44#include <pthread.h>
45
46#define MIN(a,b) ((a)<(b)?(a):(b))
47
48static void report_error(int code, const char *where, const char *what)
49{
50 if (code != 0)
51 qWarning("%s: %s failure: %d", where, what, code);
52}
53
54struct QWaitConditionPrivate
55{
56 pthread_mutex_t mutex;
57 pthread_cond_t cond;
58 int waiters;
59 int wakeups;
60
61 void wait()
62 {
63 int code;
64 for (;;)
65 {
66 code = pthread_cond_wait(&cond, &mutex);
67 if (code == 0 && wakeups == 0)
68 {
69 // many vendors warn of spurios wakeups from
70 // pthread_cond_wait(), especially after signal delivery,
71 // even though POSIX doesn't allow for it... sigh
72 continue;
73 }
74 break;
75 }
76
77 --waiters;
78 if (code == 0)
79 {
80 --wakeups;
81 }
82 else
83 {
84 report_error(code, "QWaitCondition::wait()", "cv wait");
85 }
86 report_error(pthread_mutex_unlock(&mutex), "QWaitCondition::wait()", "mutex unlock");
87 }
88};
89
90
91QWaitCondition::QWaitCondition()
92{
93 d = new QWaitConditionPrivate;
94 report_error(pthread_mutex_init(&d->mutex, NULL), "QWaitCondition", "mutex init");
95 report_error(pthread_cond_init(&d->cond, NULL), "QWaitCondition", "cv init");
96 d->waiters = d->wakeups = 0;
97}
98
99
100QWaitCondition::~QWaitCondition()
101{
102 report_error(pthread_cond_destroy(&d->cond), "QWaitCondition", "cv destroy");
103 report_error(pthread_mutex_destroy(&d->mutex), "QWaitCondition", "mutex destroy");
104 delete d;
105}
106
107void QWaitCondition::wakeOne()
108{
109 report_error(pthread_mutex_lock(&d->mutex), "QWaitCondition::wakeOne()", "mutex lock");
110 d->wakeups = MIN(d->wakeups + 1, d->waiters);
111 report_error(pthread_cond_signal(&d->cond), "QWaitCondition::wakeOne()", "cv signal");
112 report_error(pthread_mutex_unlock(&d->mutex), "QWaitCondition::wakeOne()", "mutex unlock");
113}
114
115void QWaitCondition::wakeAll()
116{
117 report_error(pthread_mutex_lock(&d->mutex), "QWaitCondition::wakeAll()", "mutex lock");
118 d->wakeups = d->waiters;
119 report_error(pthread_cond_broadcast(&d->cond), "QWaitCondition::wakeAll()", "cv broadcast");
120 report_error(pthread_mutex_unlock(&d->mutex), "QWaitCondition::wakeAll()", "mutex unlock");
121}
122
123void QWaitCondition::wait(QMutex *mutex)
124{
125 if (!mutex) return;
126
127 report_error(pthread_mutex_lock(&d->mutex), "QWaitCondition::wait()", "mutex lock");
128 ++d->waiters;
129 mutex->unlock();
130 d->wait();
131 mutex->lock();
132}
133
134

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