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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2015 Olivier Goffart <ogoffart@woboq.com>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qplatformdefs.h"
#include "qmutex.h"
#include "qstring.h"
#include "qelapsedtimer.h"
#include "qatomic.h"
#include "qmutex_p.h"
#include <errno.h>
#include <sys/time.h>
#include <time.h>
#include "private/qcore_unix_p.h"
#if defined(Q_OS_VXWORKS) && defined(wakeup)
#undef wakeup
#endif
QT_BEGIN_NAMESPACE
static void report_error(int code, const char *where, const char *what)
{
if (code != 0)
qErrnoWarning(code, "%s: %s failure", where, what);
}
#ifdef QT_UNIX_SEMAPHORE
QMutexPrivate::QMutexPrivate()
{
report_error(sem_init(&semaphore, 0, 0), "QMutex", "sem_init");
}
QMutexPrivate::~QMutexPrivate()
{
report_error(sem_destroy(&semaphore), "QMutex", "sem_destroy");
}
bool QMutexPrivate::wait(int timeout)
{
int errorCode;
if (timeout < 0) {
do {
errorCode = sem_wait(&semaphore);
} while (errorCode && errno == EINTR);
report_error(errorCode, "QMutex::lock()", "sem_wait");
} else {
timespec ts;
report_error(clock_gettime(CLOCK_REALTIME, &ts), "QMutex::lock()", "clock_gettime");
ts.tv_sec += timeout / 1000;
ts.tv_nsec += timeout % 1000 * Q_UINT64_C(1000) * 1000;
normalizedTimespec(ts);
do {
errorCode = sem_timedwait(&semaphore, &ts);
} while (errorCode && errno == EINTR);
if (errorCode && errno == ETIMEDOUT)
return false;
report_error(errorCode, "QMutex::lock()", "sem_timedwait");
}
return true;
}
void QMutexPrivate::wakeUp() noexcept
{
report_error(sem_post(&semaphore), "QMutex::unlock", "sem_post");
}
#else // QT_UNIX_SEMAPHORE
QMutexPrivate::QMutexPrivate()
: wakeup(false)
{
report_error(pthread_mutex_init(&mutex, NULL), "QMutex", "mutex init");
qt_initialize_pthread_cond(&cond, "QMutex");
}
QMutexPrivate::~QMutexPrivate()
{
report_error(pthread_cond_destroy(&cond), "QMutex", "cv destroy");
report_error(pthread_mutex_destroy(&mutex), "QMutex", "mutex destroy");
}
bool QMutexPrivate::wait(int timeout)
{
report_error(pthread_mutex_lock(&mutex), "QMutex::lock", "mutex lock");
int errorCode = 0;
while (!wakeup) {
if (timeout < 0) {
errorCode = pthread_cond_wait(&cond, &mutex);
} else {
timespec ti;
qt_abstime_for_timeout(&ti, QDeadlineTimer(timeout));
errorCode = pthread_cond_timedwait(&cond, &mutex, &ti);
}
if (errorCode) {
if (errorCode == ETIMEDOUT) {
if (wakeup)
errorCode = 0;
break;
}
report_error(errorCode, "QMutex::lock()", "cv wait");
}
}
bool ret = wakeup;
wakeup = false;
report_error(pthread_mutex_unlock(&mutex), "QMutex::lock", "mutex unlock");
return ret;
}
void QMutexPrivate::wakeUp() noexcept
{
report_error(pthread_mutex_lock(&mutex), "QMutex::unlock", "mutex lock");
wakeup = true;
report_error(pthread_cond_signal(&cond), "QMutex::unlock", "cv signal");
report_error(pthread_mutex_unlock(&mutex), "QMutex::unlock", "mutex unlock");
}
#endif
QT_END_NAMESPACE
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