diff options
author | Olivier Goffart <olivier.goffart@nokia.com> | 2011-07-02 15:13:12 +0200 |
---|---|---|
committer | Qt by Nokia <qt-info@nokia.com> | 2011-07-29 10:32:07 +0200 |
commit | 86a237929e2b67ce333b635b760e78c628effb60 (patch) | |
tree | 290ad9a01a9bcf19ef02f4455728823d136b7193 /src/corelib/thread/qmutex_mac.cpp | |
parent | 487583459ea7958f24cd579888a662bcce26caf3 (diff) |
QMutex is now just a pointer
And added a POD QBasicMutex. (QBasicMutex* can safely be
static_cast'ed to QMutex*)
The d pointer is not anymore always a QMutexPrivate.
If d == 0x0: the mutex is unlocked
If d == 0x1: the mutex is locked, uncontended
On linux:
if d == 0x3: the mutex is locked contended, waiting on a futex
If d is a pointer, it is a recursive mutex.
On non-linux platforms:
When a thread tries to lock a mutex for which d == 0x1, it will try to
assing it a QMutexPrivated (allocated from a freelist) in order to wait
for it.
Change-Id: Ie1431cd9402a576fdd9a693cfd747166eebf5622
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>
Reviewed-on: http://codereview.qt.nokia.com/2116
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Olivier Goffart <olivier.goffart@nokia.com>
Diffstat (limited to 'src/corelib/thread/qmutex_mac.cpp')
-rw-r--r-- | src/corelib/thread/qmutex_mac.cpp | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/src/corelib/thread/qmutex_mac.cpp b/src/corelib/thread/qmutex_mac.cpp new file mode 100644 index 0000000000..f63feebca4 --- /dev/null +++ b/src/corelib/thread/qmutex_mac.cpp @@ -0,0 +1,96 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtCore module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qplatformdefs.h" +#include "qmutex.h" + +#if !defined(QT_NO_THREAD) + +#include "qmutex_p.h" + +#include <mach/mach.h> +#include <mach/task.h> + +#include <errno.h> + +QT_BEGIN_NAMESPACE + +QMutexPrivate::QMutexPrivate(QMutex::RecursionMode mode) + : recursive(mode == QMutex::Recursive) +{ + kern_return_t r = semaphore_create(mach_task_self(), &mach_semaphore, SYNC_POLICY_FIFO, 0); + if (r != KERN_SUCCESS) + qWarning("QMutex: failed to create semaphore, error %d", r); +} + +QMutexPrivate::~QMutexPrivate() +{ + kern_return_t r = semaphore_destroy(mach_task_self(), mach_semaphore); + if (r != KERN_SUCCESS) + qWarning("QMutex: failed to destroy semaphore, error %d", r); +} + +bool QMutexPrivate::wait(int timeout) +{ + kern_return_t r; + if (timeout < 0) { + do { + r = semaphore_wait(mach_semaphore); + } while (r == KERN_ABORTED); + Q_ASSERT(r == KERN_SUCCESS); + } else { + mach_timespec_t ts; + ts.tv_nsec = ((timeout % 1000) * 1000) * 1000; + ts.tv_sec = (timeout / 1000); + r = semaphore_timedwait(mach_semaphore, ts); + } + return (r == KERN_SUCCESS); +} + +void QMutexPrivate::wakeUp() +{ + semaphore_signal(mach_semaphore); +} + + +QT_END_NAMESPACE + +#endif //QT_NO_THREAD |