249 lines
7.3 KiB
C++
249 lines
7.3 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qplatformdefs.h"
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#include "qwaitcondition.h"
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#include "qmutex.h"
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#include "qreadwritelock.h"
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#include "qatomic.h"
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#include "qstring.h"
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#include "qmutex_p.h"
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#include "qreadwritelock_p.h"
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#include <errno.h>
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#ifdef Q_OS_GENODE
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#include <os/timed_semaphore.h>
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#endif /* Q_OS_GENODE */
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#ifndef QT_NO_THREAD
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QT_BEGIN_NAMESPACE
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#ifndef Q_OS_GENODE
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static void report_error(int code, const char *where, const char *what)
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{
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if (code != 0)
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qWarning("%s: %s failure: %s", where, what, qPrintable(qt_error_string(code)));
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}
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#endif /* Q_OS_GENODE */
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class QWaitConditionPrivate {
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public:
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#ifdef Q_OS_GENODE
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Genode::Lock mutex;
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Genode::Timed_semaphore sem;
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#else
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pthread_mutex_t mutex;
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pthread_cond_t cond;
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int waiters;
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int wakeups;
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bool wait(unsigned long time)
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{
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int code;
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forever {
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if (time != ULONG_MAX) {
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struct timeval tv;
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gettimeofday(&tv, 0);
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timespec ti;
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ti.tv_nsec = (tv.tv_usec + (time % 1000) * 1000) * 1000;
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ti.tv_sec = tv.tv_sec + (time / 1000) + (ti.tv_nsec / 1000000000);
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ti.tv_nsec %= 1000000000;
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code = pthread_cond_timedwait(&cond, &mutex, &ti);
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} else {
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code = pthread_cond_wait(&cond, &mutex);
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}
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if (code == 0 && wakeups == 0) {
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// many vendors warn of spurios wakeups from
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// pthread_cond_wait(), especially after signal delivery,
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// even though POSIX doesn't allow for it... sigh
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continue;
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}
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break;
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}
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Q_ASSERT_X(waiters > 0, "QWaitCondition::wait", "internal error (waiters)");
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--waiters;
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if (code == 0) {
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Q_ASSERT_X(wakeups > 0, "QWaitCondition::wait", "internal error (wakeups)");
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--wakeups;
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}
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report_error(pthread_mutex_unlock(&mutex), "QWaitCondition::wait()", "mutex unlock");
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if (code && code != ETIMEDOUT)
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report_error(code, "QWaitCondition::wait()", "cv wait");
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return (code == 0);
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}
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#endif /* Q_OS_GENODE */
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};
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QWaitCondition::QWaitCondition()
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{
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d = new QWaitConditionPrivate;
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#ifndef Q_OS_GENODE
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report_error(pthread_mutex_init(&d->mutex, NULL), "QWaitCondition", "mutex init");
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report_error(pthread_cond_init(&d->cond, NULL), "QWaitCondition", "cv init");
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d->waiters = d->wakeups = 0;
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#endif /* Q_OS_GENODE */
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}
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QWaitCondition::~QWaitCondition()
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{
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#ifndef Q_OS_GENODE
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report_error(pthread_cond_destroy(&d->cond), "QWaitCondition", "cv destroy");
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report_error(pthread_mutex_destroy(&d->mutex), "QWaitCondition", "mutex destroy");
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#endif /* Q_OS_GENODE */
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delete d;
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}
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void QWaitCondition::wakeOne()
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{
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#ifdef Q_OS_GENODE
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Genode::Lock::Guard lock_guard(d->mutex);
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if (d->sem.cnt() < 0) {
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d->sem.up();
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}
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#else
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report_error(pthread_mutex_lock(&d->mutex), "QWaitCondition::wakeOne()", "mutex lock");
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d->wakeups = qMin(d->wakeups + 1, d->waiters);
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report_error(pthread_cond_signal(&d->cond), "QWaitCondition::wakeOne()", "cv signal");
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report_error(pthread_mutex_unlock(&d->mutex), "QWaitCondition::wakeOne()", "mutex unlock");
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#endif /* Q_OS_GENODE */
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}
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void QWaitCondition::wakeAll()
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{
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#ifdef Q_OS_GENODE
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Genode::Lock::Guard lock_guard(d->mutex);
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while (d->sem.cnt() < 0) {
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d->sem.up();
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}
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#else
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report_error(pthread_mutex_lock(&d->mutex), "QWaitCondition::wakeAll()", "mutex lock");
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d->wakeups = d->waiters;
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report_error(pthread_cond_broadcast(&d->cond), "QWaitCondition::wakeAll()", "cv broadcast");
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report_error(pthread_mutex_unlock(&d->mutex), "QWaitCondition::wakeAll()", "mutex unlock");
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#endif /* Q_OS_GENODE */
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}
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bool QWaitCondition::wait(QMutex *mutex, unsigned long time)
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{
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if (! mutex)
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return false;
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if (mutex->isRecursive()) {
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qWarning("QWaitCondition: cannot wait on recursive mutexes");
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return false;
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}
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#ifndef Q_OS_GENODE
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report_error(pthread_mutex_lock(&d->mutex), "QWaitCondition::wait()", "mutex lock");
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++d->waiters;
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#endif /* Q_OS_GENODE */
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mutex->unlock();
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#ifdef Q_OS_GENODE
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bool returnValue;
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if (time == ULONG_MAX) {
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/* Timeout: never */
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d->sem.down();
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returnValue = true;
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} else {
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try {
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d->sem.down((Genode::Alarm::Time) time);
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returnValue = true;
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} catch (Genode::Timeout_exception) {
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returnValue = false;
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}
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}
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#else
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bool returnValue = d->wait(time);
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#endif /* Q_OS_GENODE */
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mutex->lock();
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return returnValue;
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}
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#ifndef Q_OS_GENODE
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bool QWaitCondition::wait(QReadWriteLock *readWriteLock, unsigned long time)
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{
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if (!readWriteLock || readWriteLock->d->accessCount == 0)
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return false;
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if (readWriteLock->d->accessCount < -1) {
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qWarning("QWaitCondition: cannot wait on QReadWriteLocks with recursive lockForWrite()");
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return false;
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}
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report_error(pthread_mutex_lock(&d->mutex), "QWaitCondition::wait()", "mutex lock");
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++d->waiters;
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int previousAccessCount = readWriteLock->d->accessCount;
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readWriteLock->unlock();
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bool returnValue = d->wait(time);
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if (previousAccessCount < 0)
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readWriteLock->lockForWrite();
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else
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readWriteLock->lockForRead();
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return returnValue;
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}
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#endif /* Q_OS_GENODE */
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QT_END_NAMESPACE
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#endif // QT_NO_THREAD
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