| /**************************************************************************** |
| ** |
| ** 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 |
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| ** |
| ** 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 |
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| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #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 |