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| Source at commit 1322 created 12 years 8 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 "qwaitcondition.h"␊ |
| 43 | #include "qmutex.h"␊ |
| 44 | #include <pthread.h>␊ |
| 45 | ␊ |
| 46 | #define MIN(a,b) ((a)<(b)?(a):(b))␊ |
| 47 | ␊ |
| 48 | static 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 | ␊ |
| 54 | struct 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 | ␊ |
| 91 | QWaitCondition::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 | ␊ |
| 100 | QWaitCondition::~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 | ␊ |
| 107 | void 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 | ␊ |
| 115 | void 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 | ␊ |
| 123 | void 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 | |
