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/****************************************************************************
**
** Cross-platform QThread implementation.
**
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the kernel module of the Qt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free Qt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.QPL
** included in the packaging of this file. Licensees holding valid Qt
** Commercial licenses may use this file in accordance with the Qt
** Commercial License Agreement provided with the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#ifdef QT_THREAD_SUPPORT
#include "qplatformdefs.h"
#include "qthread.h"
#include <private/qthreadinstance_p.h>
#ifndef QT_H
# include "qapplication.h"
#endif // QT_H
#if QT_VERSION >= 0x040000
# error "Remove QThread::QThread() and QThread::start()."
#endif
/*!
\class QThread qthread.h
\threadsafe
\brief The QThread class provides platform-independent threads.
\ingroup thread
\ingroup environment
A QThread represents a separate thread of control within the
program; it shares data with all the other threads within the
process but executes independently in the way that a separate
program does on a multitasking operating system. Instead of
starting in main(), QThreads begin executing in run(). You inherit
run() to include your code. For example:
\code
class MyThread : public QThread {
public:
virtual void run();
};
void MyThread::run()
{
for( int count = 0; count < 20; count++ ) {
sleep( 1 );
qDebug( "Ping!" );
}
}
int main()
{
MyThread a;
MyThread b;
a.start();
b.start();
a.wait();
b.wait();
}
\endcode
This will start two threads, each of which writes Ping! 20 times
to the screen and exits. The wait() calls at the end of main() are
necessary because exiting main() ends the program, unceremoniously
killing all other threads. Each MyThread stops executing when it
reaches the end of MyThread::run(), just as an application does
when it leaves main().
\sa \link threads.html Thread Support in Qt\endlink.
*/
/*!
\enum QThread::Priority
This enum type indicates how the operating system should schedule
newly created threads.
\value IdlePriority scheduled only when no other threads are
running.
\value LowestPriority scheduled less often than LowPriority.
\value LowPriority scheduled less often than NormalPriority.
\value NormalPriority the default priority of the operating
system.
\value HighPriority scheduled more often than NormalPriority.
\value HighestPriority scheduled more often then HighPriority.
\value TimeCriticalPriority scheduled as often as possible.
\value InheritPriority use the same priority as the creating
thread. This is the default.
*/
QThread::QThread()
{
d = new QThreadInstance;
d->init(0);
}
/*!
Constructs a new thread. The thread does not begin executing until
start() is called.
If \a stackSize is greater than zero, the maximum stack size is
set to \a stackSize bytes, otherwise the maximum stack size is
automatically determined by the operating system.
\warning Most operating systems place minimum and maximum limits
on thread stack sizes. The thread will fail to start if the stack
size is outside these limits.
*/
QThread::QThread( unsigned int stackSize )
{
d = new QThreadInstance;
d->init(stackSize);
}
/*!
QThread destructor.
Note that deleting a QThread object will not stop the execution of
the thread it represents. Deleting a running QThread (i.e.
finished() returns FALSE) will probably result in a program crash.
You can wait() on a thread to make sure that it has finished.
*/
QThread::~QThread()
{
QMutexLocker locker( d->mutex() );
if ( d->running && !d->finished ) {
#ifdef QT_CHECK_STATE
qWarning("QThread object destroyed while thread is still running.");
#endif
d->orphan = TRUE;
return;
}
d->deinit();
delete d;
}
/*!
This function terminates the execution of the thread. The thread
may or may not be terminated immediately, depending on the
operating system's scheduling policies. Use QThread::wait()
after terminate() for synchronous termination.
When the thread is terminated, all threads waiting for the
the thread to finish will be woken up.
\warning This function is dangerous, and its use is discouraged.
The thread can be terminated at any point in its code path. Threads
can be terminated while modifying data. There is no chance for
the thread to cleanup after itself, unlock any held mutexes, etc.
In short, use this function only if \e absolutely necessary.
*/
void QThread::terminate()
{
QMutexLocker locker( d->mutex() );
if ( d->finished || !d->running )
return;
d->terminate();
}
/*!
Returns TRUE if the thread is finished; otherwise returns FALSE.
*/
bool QThread::finished() const
{
QMutexLocker locker( d->mutex() );
return d->finished;
}
/*!
Returns TRUE if the thread is running; otherwise returns FALSE.
*/
bool QThread::running() const
{
QMutexLocker locker( d->mutex() );
return d->running;
}
/*!
\fn void QThread::run()
This method is pure virtual, and must be implemented in derived
classes in order to do useful work. Returning from this method
will end the execution of the thread.
\sa wait()
*/
#ifndef QT_NO_COMPAT
/*! \obsolete
Use QApplication::postEvent() instead.
*/
void QThread::postEvent( QObject * receiver, QEvent * event )
{
QApplication::postEvent( receiver, event );
}
#endif
#endif // QT_THREAD_SUPPORT
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