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+<h2>thread_sample</h2>
+<hr>
+<p>
+<strong>Function</strong> - Perform periodic PC sampling for a thread.
+<h3>SYNOPSIS</h3>
+<pre>
+<strong>kern_return_t   thread_sample</strong>
+                <strong>(thread_act_t</strong>                     <var>sample_thread</var>,
+                 <strong>mach_port_make_send_t</strong>               <var>reply_port</var><strong>);</strong>
+</pre>
+<h3>PARAMETERS</h3>
+<dl>
+<p>
+<dt> <var>sample_thread</var> 
+<dd>
+[in thread send right]
+Thread whose PC is to be sampled
+<p>
+<dt> <var>reply_port</var> 
+<dd>
+[in sample receive (to be converted to send) right]
+Port to which PC 
+sample buffers are sent.  A value of <strong>MACH_PORT_NULL</strong> stops PC 
+sampling for the thread.
+</dl>
+<h3>DESCRIPTION</h3>
+<p>
+The <strong>thread_sample</strong> function causes the program counter
+(PC) of the specified 
+<var>sample_thread</var> to be sampled periodically (whenever the thread happens to be 
+running at the time of the kernel's "hardclock" interrupt). 
+The set of PC sample 
+values obtained are saved in buffers which are sent to the specified
+<var>reply_port</var> in 
+<strong>receive_samples</strong> messages.
+<h3>RETURN VALUES</h3>
+<p>
+Only generic errors apply.
+<h3>RELATED INFORMATION</h3>
+<p>
+Functions:
+<a href="task_sample.html"><strong>task_sample</strong></a>,
+<a href="receive_samples.html"><strong>receive_samples</strong></a>.