1*699cd480SApple OSS Distributions<h2>thread_sample</h2> 2*699cd480SApple OSS Distributions<hr> 3*699cd480SApple OSS Distributions<p> 4*699cd480SApple OSS Distributions<strong>Function</strong> - Perform periodic PC sampling for a thread. 5*699cd480SApple OSS Distributions<h3>SYNOPSIS</h3> 6*699cd480SApple OSS Distributions<pre> 7*699cd480SApple OSS Distributions<strong>kern_return_t thread_sample</strong> 8*699cd480SApple OSS Distributions <strong>(thread_act_t</strong> <var>sample_thread</var>, 9*699cd480SApple OSS Distributions <strong>mach_port_make_send_t</strong> <var>reply_port</var><strong>);</strong> 10*699cd480SApple OSS Distributions</pre> 11*699cd480SApple OSS Distributions<h3>PARAMETERS</h3> 12*699cd480SApple OSS Distributions<dl> 13*699cd480SApple OSS Distributions<p> 14*699cd480SApple OSS Distributions<dt> <var>sample_thread</var> 15*699cd480SApple OSS Distributions<dd> 16*699cd480SApple OSS Distributions[in thread send right] 17*699cd480SApple OSS DistributionsThread whose PC is to be sampled 18*699cd480SApple OSS Distributions<p> 19*699cd480SApple OSS Distributions<dt> <var>reply_port</var> 20*699cd480SApple OSS Distributions<dd> 21*699cd480SApple OSS Distributions[in sample receive (to be converted to send) right] 22*699cd480SApple OSS DistributionsPort to which PC 23*699cd480SApple OSS Distributionssample buffers are sent. A value of <strong>MACH_PORT_NULL</strong> stops PC 24*699cd480SApple OSS Distributionssampling for the thread. 25*699cd480SApple OSS Distributions</dl> 26*699cd480SApple OSS Distributions<h3>DESCRIPTION</h3> 27*699cd480SApple OSS Distributions<p> 28*699cd480SApple OSS DistributionsThe <strong>thread_sample</strong> function causes the program counter 29*699cd480SApple OSS Distributions(PC) of the specified 30*699cd480SApple OSS Distributions<var>sample_thread</var> to be sampled periodically (whenever the thread happens to be 31*699cd480SApple OSS Distributionsrunning at the time of the kernel's "hardclock" interrupt). 32*699cd480SApple OSS DistributionsThe set of PC sample 33*699cd480SApple OSS Distributionsvalues obtained are saved in buffers which are sent to the specified 34*699cd480SApple OSS Distributions<var>reply_port</var> in 35*699cd480SApple OSS Distributions<strong>receive_samples</strong> messages. 36*699cd480SApple OSS Distributions<h3>RETURN VALUES</h3> 37*699cd480SApple OSS Distributions<p> 38*699cd480SApple OSS DistributionsOnly generic errors apply. 39*699cd480SApple OSS Distributions<h3>RELATED INFORMATION</h3> 40*699cd480SApple OSS Distributions<p> 41*699cd480SApple OSS DistributionsFunctions: 42*699cd480SApple OSS Distributions<a href="task_sample.html"><strong>task_sample</strong></a>, 43*699cd480SApple OSS Distributions<a href="receive_samples.html"><strong>receive_samples</strong></a>. 44