1*1031c584SApple OSS Distributions<h2>thread_sample</h2> 2*1031c584SApple OSS Distributions<hr> 3*1031c584SApple OSS Distributions<p> 4*1031c584SApple OSS Distributions<strong>Function</strong> - Perform periodic PC sampling for a thread. 5*1031c584SApple OSS Distributions<h3>SYNOPSIS</h3> 6*1031c584SApple OSS Distributions<pre> 7*1031c584SApple OSS Distributions<strong>kern_return_t thread_sample</strong> 8*1031c584SApple OSS Distributions <strong>(thread_act_t</strong> <var>sample_thread</var>, 9*1031c584SApple OSS Distributions <strong>mach_port_make_send_t</strong> <var>reply_port</var><strong>);</strong> 10*1031c584SApple OSS Distributions</pre> 11*1031c584SApple OSS Distributions<h3>PARAMETERS</h3> 12*1031c584SApple OSS Distributions<dl> 13*1031c584SApple OSS Distributions<p> 14*1031c584SApple OSS Distributions<dt> <var>sample_thread</var> 15*1031c584SApple OSS Distributions<dd> 16*1031c584SApple OSS Distributions[in thread send right] 17*1031c584SApple OSS DistributionsThread whose PC is to be sampled 18*1031c584SApple OSS Distributions<p> 19*1031c584SApple OSS Distributions<dt> <var>reply_port</var> 20*1031c584SApple OSS Distributions<dd> 21*1031c584SApple OSS Distributions[in sample receive (to be converted to send) right] 22*1031c584SApple OSS DistributionsPort to which PC 23*1031c584SApple OSS Distributionssample buffers are sent. A value of <strong>MACH_PORT_NULL</strong> stops PC 24*1031c584SApple OSS Distributionssampling for the thread. 25*1031c584SApple OSS Distributions</dl> 26*1031c584SApple OSS Distributions<h3>DESCRIPTION</h3> 27*1031c584SApple OSS Distributions<p> 28*1031c584SApple OSS DistributionsThe <strong>thread_sample</strong> function causes the program counter 29*1031c584SApple OSS Distributions(PC) of the specified 30*1031c584SApple OSS Distributions<var>sample_thread</var> to be sampled periodically (whenever the thread happens to be 31*1031c584SApple OSS Distributionsrunning at the time of the kernel's "hardclock" interrupt). 32*1031c584SApple OSS DistributionsThe set of PC sample 33*1031c584SApple OSS Distributionsvalues obtained are saved in buffers which are sent to the specified 34*1031c584SApple OSS Distributions<var>reply_port</var> in 35*1031c584SApple OSS Distributions<strong>receive_samples</strong> messages. 36*1031c584SApple OSS Distributions<h3>RETURN VALUES</h3> 37*1031c584SApple OSS Distributions<p> 38*1031c584SApple OSS DistributionsOnly generic errors apply. 39*1031c584SApple OSS Distributions<h3>RELATED INFORMATION</h3> 40*1031c584SApple OSS Distributions<p> 41*1031c584SApple OSS DistributionsFunctions: 42*1031c584SApple OSS Distributions<a href="task_sample.html"><strong>task_sample</strong></a>, 43*1031c584SApple OSS Distributions<a href="receive_samples.html"><strong>receive_samples</strong></a>. 44