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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>.