MSLEEP(9) Driver Basics MSLEEP(9)NAME
msleep - sleep safely even with waitqueue interruptions
SYNOPSIS
void msleep(unsigned int msecs);
ARGUMENTS
msecs
Time in milliseconds to sleep for
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QThread(3qt)QThread(3qt)NAME
QThread - Platform-independent threads
SYNOPSIS
All the functions in this class are thread-safe when Qt is built with thread support.</p>
#include <qthread.h>
Inherits Qt.
Public Members
QThread ()
QThread ( unsigned int stackSize )
virtual ~QThread ()
bool wait ( unsigned long time = ULONG_MAX )
void start ()
void terminate ()
bool finished () const
bool running () const
Static Public Members
Qt::HANDLE currentThread ()
void postEvent ( QObject * receiver, QEvent * event ) (obsolete)
void exit ()
Protected Members
virtual void run () = 0
Static Protected Members
void sleep ( unsigned long secs )
void msleep ( unsigned long msecs )
void usleep ( unsigned long usecs )
DESCRIPTION
The QThread class provides platform-independent threads.
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:
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();
}
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().
See also Thread Support in Qt, Environment Classes, and Threading.
MEMBER FUNCTION DOCUMENTATION QThread::QThread ()
Constructs a new thread. The thread does not begin executing until start() is called.
QThread::QThread ( unsigned int stackSize )
Constructs a new thread. The thread does not begin executing until start() is called.
If stackSize is greater than zero, the maximum stack size is set to 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 () [virtual]
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.
Qt::HANDLE QThread::currentThread () [static]
This returns the thread handle of the currently executing thread.
Warning: The handle returned by this function is used for internal purposes and should not be used in any application code. On Windows, the
returned value is a pseudo handle for the current thread, and it cannot be used for numerical comparison.
void QThread::exit () [static]
Ends the execution of the calling thread and wakes up any threads waiting for its termination.
bool QThread::finished () const
Returns TRUE is the thread is finished; otherwise returns FALSE.
void QThread::msleep ( unsigned long msecs ) [static protected]
System independent sleep. This causes the current thread to sleep for msecs milliseconds
void QThread::postEvent ( QObject * receiver, QEvent * event ) [static]
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Use QApplication::postEvent() instead.
void QThread::run () [pure virtual protected]
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.
See also wait().
bool QThread::running () const
Returns TRUE if the thread is running; otherwise returns FALSE.
void QThread::sleep ( unsigned long secs ) [static protected]
System independent sleep. This causes the current thread to sleep for secs seconds.
void QThread::start ()
This begins the execution of the thread by calling run(), which should be reimplemented in a QThread subclass to contain your code. If you
try to start a thread that is already running, this call will wait until the thread has finished, and then restart the thread.
void QThread::terminate ()
This function terminates the execution of the thread. The thread may or may not be terminated immediately, depending on the operating
systems 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 terminate 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 absolutely necessary.
void QThread::usleep ( unsigned long usecs ) [static protected]
System independent sleep. This causes the current thread to sleep for usecs microseconds
bool QThread::wait ( unsigned long time = ULONG_MAX )
This provides similar functionality to POSIX pthread_join. A thread calling this will block until either of these conditions is met:
The thread associated with this QThread object has finished execution (i.e. when it returns from run()). This function will return TRUE if
the thread has finished. It also returns TRUE if the thread has not been started yet.
time milliseconds has elapsed. If time is ULONG_MAX (the
default), then the wait will never timeout (the thread must return from run()). This function will return FALSE if the wait timed
out.
SEE ALSO
http://doc.trolltech.com/qthread.html http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2001 Trolltech AS, http://www.trolltech.com. See the license file included in the distribution for a complete license
statement.
AUTHOR
Generated automatically from the source code.
BUGS
If you find a bug in Qt, please report it as described in http://doc.trolltech.com/bughowto.html. Good bug reports help us to help you.
Thank you.
The definitive Qt documentation is provided in HTML format; it is located at $QTDIR/doc/html and can be read using Qt Assistant or with a
web browser. This man page is provided as a convenience for those users who prefer man pages, although this format is not officially
supported by Trolltech.
If you find errors in this manual page, please report them to qt-bugs@trolltech.com. Please include the name of the manual page
(qthread.3qt) and the Qt version (3.1.1).
Trolltech AS 9 December 2002 QThread(3qt)