You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
253 lines
11 KiB
253 lines
11 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
|
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qthread.cpp:52 -->
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
|
<title>TQThread Class</title>
|
|
<style type="text/css"><!--
|
|
fn { margin-left: 1cm; text-indent: -1cm; }
|
|
a:link { color: #004faf; text-decoration: none }
|
|
a:visited { color: #672967; text-decoration: none }
|
|
body { background: #ffffff; color: black; }
|
|
--></style>
|
|
</head>
|
|
<body>
|
|
|
|
<table border="0" cellpadding="0" cellspacing="0" width="100%">
|
|
<tr bgcolor="#E5E5E5">
|
|
<td valign=center>
|
|
<a href="index.html">
|
|
<font color="#004faf">Home</font></a>
|
|
| <a href="classes.html">
|
|
<font color="#004faf">All Classes</font></a>
|
|
| <a href="mainclasses.html">
|
|
<font color="#004faf">Main Classes</font></a>
|
|
| <a href="annotated.html">
|
|
<font color="#004faf">Annotated</font></a>
|
|
| <a href="groups.html">
|
|
<font color="#004faf">Grouped Classes</font></a>
|
|
| <a href="functions.html">
|
|
<font color="#004faf">Functions</font></a>
|
|
</td>
|
|
<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQThread Class Reference</h1>
|
|
|
|
<p>The TQThread class provides platform-independent threads.
|
|
<a href="#details">More...</a>
|
|
<p>All the functions in this class are <a href="threads.html#threadsafe">thread-safe</a> when TQt is built with thread support.</p>
|
|
<p><tt>#include <<a href="qthread-h.html">ntqthread.h</a>></tt>
|
|
<p>Inherits <a href="ntqt.html">TQt</a>.
|
|
<p><a href="qthread-members.html">List of all member functions.</a>
|
|
<h2>Public Members</h2>
|
|
<ul>
|
|
<li class=fn><a href="#TQThread"><b>TQThread</b></a> ( unsigned int stackSize = 0 )</li>
|
|
<li class=fn>virtual <a href="#~TQThread"><b>~TQThread</b></a> ()</li>
|
|
<li class=fn>bool <a href="#wait"><b>wait</b></a> ( unsigned long time = ULONG_MAX )</li>
|
|
<li class=fn>enum <a href="#Priority-enum"><b>Priority</b></a> { IdlePriority, LowestPriority, LowPriority, NormalPriority, HighPriority, HighestPriority, TimeCriticalPriority, InheritPriority }</li>
|
|
<li class=fn>void <a href="#start"><b>start</b></a> ( Priority priority = InheritPriority )</li>
|
|
<li class=fn>void <a href="#terminate"><b>terminate</b></a> ()</li>
|
|
<li class=fn>bool <a href="#finished"><b>finished</b></a> () const</li>
|
|
<li class=fn>bool <a href="#running"><b>running</b></a> () const</li>
|
|
</ul>
|
|
<h2>Static Public Members</h2>
|
|
<ul>
|
|
<li class=fn>TQt::HANDLE <a href="#currentThread"><b>currentThread</b></a> ()</li>
|
|
<li class=fn>void postEvent ( TQObject * receiver, TQEvent * event ) <em>(obsolete)</em></li>
|
|
<li class=fn>void <a href="#exit"><b>exit</b></a> ()</li>
|
|
</ul>
|
|
<h2>Protected Members</h2>
|
|
<ul>
|
|
<li class=fn>virtual void <a href="#run"><b>run</b></a> () = 0</li>
|
|
</ul>
|
|
<h2>Static Protected Members</h2>
|
|
<ul>
|
|
<li class=fn>void <a href="#sleep"><b>sleep</b></a> ( unsigned long secs )</li>
|
|
<li class=fn>void <a href="#msleep"><b>msleep</b></a> ( unsigned long msecs )</li>
|
|
<li class=fn>void <a href="#usleep"><b>usleep</b></a> ( unsigned long usecs )</li>
|
|
</ul>
|
|
<hr><a name="details"></a><h2>Detailed Description</h2>
|
|
|
|
|
|
|
|
The TQThread class provides platform-independent threads.
|
|
<p>
|
|
|
|
<p> A TQThread 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(), TQThreads begin executing in <a href="#run">run</a>(). You inherit
|
|
run() to include your code. For example:
|
|
<p> <pre>
|
|
class MyThread : public TQThread {
|
|
|
|
public:
|
|
|
|
virtual void run();
|
|
|
|
};
|
|
|
|
void MyThread::<a href="#run">run</a>()
|
|
{
|
|
for( int count = 0; count < 20; count++ ) {
|
|
<a href="#sleep">sleep</a>( 1 );
|
|
<a href="ntqapplication.html#qDebug">tqDebug</a>( "Ping!" );
|
|
}
|
|
}
|
|
|
|
int main()
|
|
{
|
|
MyThread a;
|
|
MyThread b;
|
|
a.<a href="#start">start</a>();
|
|
b.<a href="#start">start</a>();
|
|
a.<a href="#wait">wait</a>();
|
|
b.<a href="#wait">wait</a>();
|
|
}
|
|
</pre>
|
|
|
|
<p> This will start two threads, each of which writes Ping! 20 times
|
|
to the screen and exits. The <a href="#wait">wait</a>() 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().
|
|
<p> <p>See also <a href="threads.html">Thread Support in TQt</a>, <a href="environment.html">Environment Classes</a>, and <a href="thread.html">Threading</a>.
|
|
|
|
<hr><h2>Member Type Documentation</h2>
|
|
<h3 class=fn><a name="Priority-enum"></a>TQThread::Priority</h3>
|
|
|
|
<p> This enum type indicates how the operating system should schedule
|
|
newly created threads.
|
|
<ul>
|
|
<li><tt>TQThread::IdlePriority</tt> - scheduled only when no other threads are
|
|
running.
|
|
<li><tt>TQThread::LowestPriority</tt> - scheduled less often than LowPriority.
|
|
<li><tt>TQThread::LowPriority</tt> - scheduled less often than NormalPriority.
|
|
<li><tt>TQThread::NormalPriority</tt> - the default priority of the operating
|
|
system.
|
|
<li><tt>TQThread::HighPriority</tt> - scheduled more often than NormalPriority.
|
|
<li><tt>TQThread::HighestPriority</tt> - scheduled more often then HighPriority.
|
|
<li><tt>TQThread::TimeCriticalPriority</tt> - scheduled as often as possible.
|
|
<li><tt>TQThread::InheritPriority</tt> - use the same priority as the creating
|
|
thread. This is the default.
|
|
</ul>
|
|
<hr><h2>Member Function Documentation</h2>
|
|
<h3 class=fn><a name="TQThread"></a>TQThread::TQThread ( unsigned int stackSize = 0 )
|
|
</h3>
|
|
Constructs a new thread. The thread does not begin executing until
|
|
<a href="#start">start</a>() is called.
|
|
<p> If <em>stackSize</em> is greater than zero, the maximum stack size is
|
|
set to <em>stackSize</em> bytes, otherwise the maximum stack size is
|
|
automatically determined by the operating system.
|
|
<p> <b>Warning:</b> 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.
|
|
|
|
<h3 class=fn><a name="~TQThread"></a>TQThread::~TQThread ()<tt> [virtual]</tt>
|
|
</h3>
|
|
TQThread destructor.
|
|
<p> Note that deleting a TQThread object will not stop the execution of
|
|
the thread it represents. Deleting a running TQThread (i.e.
|
|
<a href="#finished">finished</a>() returns FALSE) will probably result in a program crash.
|
|
You can <a href="#wait">wait</a>() on a thread to make sure that it has finished.
|
|
|
|
<h3 class=fn>TQt::HANDLE <a name="currentThread"></a>TQThread::currentThread ()<tt> [static]</tt>
|
|
</h3>
|
|
This returns the thread handle of the currently executing thread.
|
|
<p> <b>Warning:</b> The handle returned by this function is used for internal
|
|
purposes and should <em>not</em> 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.
|
|
|
|
<h3 class=fn>void <a name="exit"></a>TQThread::exit ()<tt> [static]</tt>
|
|
</h3>
|
|
Ends the execution of the calling thread and wakes up any threads
|
|
waiting for its termination.
|
|
|
|
<h3 class=fn>bool <a name="finished"></a>TQThread::finished () const
|
|
</h3>
|
|
Returns TRUE if the thread is finished; otherwise returns FALSE.
|
|
|
|
<h3 class=fn>void <a name="msleep"></a>TQThread::msleep ( unsigned long msecs )<tt> [static protected]</tt>
|
|
</h3>
|
|
System independent sleep. This causes the current thread to sleep
|
|
for <em>msecs</em> milliseconds
|
|
|
|
<h3 class=fn>void <a name="postEvent"></a>TQThread::postEvent ( <a href="ntqobject.html">TQObject</a> * receiver, <a href="ntqevent.html">TQEvent</a> * event )<tt> [static]</tt>
|
|
</h3> <b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
|
|
<p> Use <a href="ntqapplication.html#postEvent">TQApplication::postEvent</a>() instead.
|
|
|
|
<h3 class=fn>void <a name="run"></a>TQThread::run ()<tt> [pure virtual protected]</tt>
|
|
</h3>
|
|
|
|
<p> 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.
|
|
<p> <p>See also <a href="#wait">wait</a>().
|
|
|
|
<h3 class=fn>bool <a name="running"></a>TQThread::running () const
|
|
</h3>
|
|
Returns TRUE if the thread is running; otherwise returns FALSE.
|
|
|
|
<h3 class=fn>void <a name="sleep"></a>TQThread::sleep ( unsigned long secs )<tt> [static protected]</tt>
|
|
</h3>
|
|
System independent sleep. This causes the current thread to sleep
|
|
for <em>secs</em> seconds.
|
|
|
|
<h3 class=fn>void <a name="start"></a>TQThread::start ( <a href="ntqthread.html#Priority-enum">Priority</a> priority = InheritPriority )
|
|
</h3>
|
|
Begins execution of the thread by calling <a href="#run">run</a>(), which should be
|
|
reimplemented in a TQThread subclass to contain your code. The
|
|
operating system will schedule the thread according to the <em>priority</em> argument.
|
|
<p> If you try to start a thread that is already running, this
|
|
function will wait until the the thread has finished and then
|
|
restart the thread.
|
|
<p> <p>See also <a href="#Priority-enum">Priority</a>.
|
|
|
|
<h3 class=fn>void <a name="terminate"></a>TQThread::terminate ()
|
|
</h3>
|
|
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 <a href="#wait">TQThread::wait</a>()
|
|
after <a href="#terminate">terminate</a>() for synchronous termination.
|
|
<p> When the thread is terminated, all threads waiting for the
|
|
the thread to finish will be woken up.
|
|
<p> <b>Warning:</b> 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 <em>absolutely</em> necessary.
|
|
|
|
<h3 class=fn>void <a name="usleep"></a>TQThread::usleep ( unsigned long usecs )<tt> [static protected]</tt>
|
|
</h3>
|
|
System independent sleep. This causes the current thread to sleep
|
|
for <em>usecs</em> microseconds
|
|
|
|
<h3 class=fn>bool <a name="wait"></a>TQThread::wait ( unsigned long time = ULONG_MAX )
|
|
</h3>
|
|
A thread calling this function will block until either of these
|
|
conditions is met:
|
|
<p> <ul>
|
|
<li> The thread associated with this TQThread object has finished
|
|
execution (i.e. when it returns from <a href="#run">run</a>()). This function
|
|
will return TRUE if the thread has finished. It also returns
|
|
TRUE if the thread has not been started yet.
|
|
<li> <em>time</em> milliseconds has elapsed. If <em>time</em> is ULONG_MAX (the
|
|
default), then the wait will never timeout (the thread must
|
|
return from <a href="#run">run</a>()). This function will return FALSE if the
|
|
wait timed out.
|
|
</ul>
|
|
<p> This provides similar functionality to the POSIX <tt>pthread_join()</tt> function.
|
|
|
|
<!-- eof -->
|
|
<hr><p>
|
|
This file is part of the <a href="index.html">TQt toolkit</a>.
|
|
Copyright © 1995-2007
|
|
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
|
|
<table width=100% cellspacing=0 border=0><tr>
|
|
<td>Copyright © 2007
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
|
<td align=right><div align=right>TQt 3.3.8</div>
|
|
</table></div></address></body>
|
|
</html>
|