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<html><title>Programming Ruby: The Pragmatic Programmer's Guide</title><head><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><STYLE TYPE="text/css"><!--
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</STYLE><table bgcolor="#a03030" cellpadding="3" border="0" cellspacing="0"><tr><td colspan="3"><table bgcolor="#902020" cellpadding="20"><tr><td><h1 class="header">Programming Ruby</h1><h3 class="subheader">The Pragmatic Programmer's Guide</h3></td></tr></table></td></tr><tr><td width="33%" align="left"><a class="subheader" href="ref_c_thread.html">Previous <</a></td><td width="33%" align="center" valign="middle"><a class="subheader" href="builtins.html">Contents ^</a><br></td><td width="33%" align="right"><a class="subheader" href="ref_c_time.html">Next ></a><br></td></tr></table></head><body bgcolor="white">
<!--
Copyright (c) 2001 by Addison Wesley Longman. This
material may be distributed only subject to the terms and
conditions set forth in the Open Publication License, v1.0 or
later (the latest version is presently available at
http://www.opencontent.org/openpub/).
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<table><tr><td height="20"><img src="dot.gif" width="1" height="20"></td></tr></table><table border="0" width="100%" bgcolor="660066" cellpadding="10"><tr><td valign="center"><font color="white" size="7">class ThreadGroup</font></td><td><table border="0"><tr><td><font color="white">
Parent:
</font></td><td><font color="white">Object</font></td></tr><tr><td><font color="white">
Version:
</font></td><td><font color="white">
1.6
</font></td></tr></table></td></tr></table><p></p><H3>Index:</H3><a href="#new">new</a> <a href="#add"><i>add</i></a> <a href="#list"><i>list</i></a> <p></p><hr>
<P></P>
<code>ThreadGroup</code> provides a means of keeping track of a number of
threads as a group. A <code>Thread</code> can belong to only one
<code>ThreadGroup</code> at a time; adding a thread to a new group will
remove it from any previous group.
<P></P>
Newly created threads belong to the same group as the thread from
which they were created.
<table border="0" width="100%" cellpadding="10"><tr><td valign="center" colspan="3" bgcolor="990066"><font color="white" size="6">
constants
</font></td></tr></table><table border="2" cellpadding="5">
<tr>
<td valign="top"><tr>
<td><a name="Default"><code>Default</code></a></td>
<td></td>
<td>Default thread group.</td>
</tr>
</td>
</tr>
</table><p></p>
<P></P>
<table border="0" width="100%" cellpadding="10"><tr><td valign="center" colspan="2" bgcolor="990066"><font color="white" size="6">class methods
</font></td></tr><tr><td valign="center" bgcolor="#ff9999"><font size="4"><a name="new"><b>new</b></a></font></td><td bgcolor="#ffaaaa">
ThreadGroup.new
-> <i>thgrp</i>
</td></tr><td></td><td>
<P></P>
Returns a newly created <code>ThreadGroup</code>. The group is initially
empty.
<P></P>
</td></table>
<P></P>
<table border="0" width="100%" cellpadding="10"><tr><td valign="center" colspan="2" bgcolor="990066"><font color="white" size="6">instance methods
</font></td></tr><tr><td valign="center" bgcolor="#ff9999"><font size="4"><a name="add"><b>add</b></a></font></td><td bgcolor="#ffaaaa">
<i>thgrp</i>.add( <i>aThread</i> )
-> <i>thgrp</i>
</td></tr><td></td><td>
<P></P>
Adds the given thread to this group, removing it from any other
group to which it may have previously belonged.
<P></P>
<table bgcolor="#fff0f0" cellspacing="0" border="0" cellpadding="3" width="400"><tr><td><pre>
puts "Initial group is #{ThreadGroup::Default.list}"
tg = ThreadGroup.new
t1 = Thread.new { sleep 10 }
t2 = Thread.new { sleep 10 }
puts "t1 is #{t1}"
puts "t2 is #{t2}"
tg.add( t1 )
puts "Initial group now #{ThreadGroup::Default.list}"
puts "tg group now #{tg.list}"
</pre></td></tr></table>
<em>produces:</em>
<table bgcolor="#fff0f0" cellspacing="0" border="0" cellpadding="3" width="400"><tr><td><pre>
Initial group is #<Thread:0x40196528>
t1 is #<Thread:0x4018d400>
t2 is #<Thread:0x4018d3c4>
Initial group now #<Thread:0x4018d3c4>#<Thread:0x40196528>
tg group now #<Thread:0x4018d400>
</pre></td></tr></table>
<P></P>
</td><tr><td valign="center" bgcolor="#ff9999"><font size="4"><a name="list"><b>list</b></a></font></td><td bgcolor="#ffaaaa">
<i>thgrp</i>.list
-> <i>anArray</i>
</td></tr><td></td><td>
<P></P>
Returns an array of all existing <code>Thread</code> objects that belong
to this group.
<P></P>
<table bgcolor="#fff0f0" cellspacing="0" border="0" cellpadding="3" width="500">
<tr>
<td valign="top"><code>ThreadGroup::Default.list</code></td>
<td valign="top"></td>
<td valign="top"><code>[#<Thread:0x40196528 run>]</code></td>
</tr>
</table>
<P></P>
<P></P>
</td></table>
<P></P>
<p></p><hr><table bgcolor="#a03030" cellpadding="10" border="0" cellspacing="0"><tr><td width="33%" align="left"><a class="subheader" href="ref_c_thread.html">Previous <</a></td><td width="33%" align="center" valign="middle"><a class="subheader" href="builtins.html">Contents ^</a><br></td><td width="33%" align="right"><a class="subheader" href="ref_c_time.html">Next ></a><br></td></tr></table><p></p><font size="-1">Extracted from the book "Programming Ruby -
The Pragmatic Programmer's Guide"</font><br><font size="-3">
Copyright
©
2000 Addison Wesley Longman, Inc. Released under the terms of the
<a href="http://www.opencontent.org/openpub/">Open Publication License</a> V1.0.
<br>
This reference is available for
<a href="http://www.pragmaticprogrammer.com/ruby/downloads/book.html">download</a>.
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