1 /****************************************************************************
3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4 ** Contact: Nokia Corporation (qt-info@nokia.com)
6 ** This file is part of the QtCore module of the Qt Toolkit.
8 ** $QT_BEGIN_LICENSE:LGPL$
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.
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.
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
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.
36 ** If you are unsure which license is appropriate for your use, please
37 ** contact the sales department at http://www.qtsoftware.com/contact.
40 ****************************************************************************/
42 #include "qwaitcondition.h"
46 #define MIN(a,b) ((a)<(b)?(a):(b))
48 static void report_error(int code, const char *where, const char *what)
51 qWarning("%s: %s failure: %d", where, what, code);
54 class QWaitConditionPrivate
57 pthread_mutex_t mutex;
67 code = pthread_cond_wait(&cond, &mutex);
68 if (code == 0 && wakeups == 0)
70 // many vendors warn of spurios wakeups from
71 // pthread_cond_wait(), especially after signal delivery,
72 // even though POSIX doesn't allow for it... sigh
85 report_error(code, "QWaitCondition::wait()", "cv wait");
87 report_error(pthread_mutex_unlock(&mutex), "QWaitCondition::wait()", "mutex unlock");
92 QWaitCondition::QWaitCondition()
94 d = new QWaitConditionPrivate;
95 report_error(pthread_mutex_init(&d->mutex, NULL), "QWaitCondition", "mutex init");
96 report_error(pthread_cond_init(&d->cond, NULL), "QWaitCondition", "cv init");
97 d->waiters = d->wakeups = 0;
101 QWaitCondition::~QWaitCondition()
103 report_error(pthread_cond_destroy(&d->cond), "QWaitCondition", "cv destroy");
104 report_error(pthread_mutex_destroy(&d->mutex), "QWaitCondition", "mutex destroy");
108 void QWaitCondition::wakeOne()
110 report_error(pthread_mutex_lock(&d->mutex), "QWaitCondition::wakeOne()", "mutex lock");
111 d->wakeups = MIN(d->wakeups + 1, d->waiters);
112 report_error(pthread_cond_signal(&d->cond), "QWaitCondition::wakeOne()", "cv signal");
113 report_error(pthread_mutex_unlock(&d->mutex), "QWaitCondition::wakeOne()", "mutex unlock");
116 void QWaitCondition::wakeAll()
118 report_error(pthread_mutex_lock(&d->mutex), "QWaitCondition::wakeAll()", "mutex lock");
119 d->wakeups = d->waiters;
120 report_error(pthread_cond_broadcast(&d->cond), "QWaitCondition::wakeAll()", "cv broadcast");
121 report_error(pthread_mutex_unlock(&d->mutex), "QWaitCondition::wakeAll()", "mutex unlock");
124 void QWaitCondition::wait(QMutex *mutex)
128 report_error(pthread_mutex_lock(&d->mutex), "QWaitCondition::wait()", "mutex lock");