1*e13b1fa5SApple OSS Distributions<h2>thread_sample</h2> 2*e13b1fa5SApple OSS Distributions<hr> 3*e13b1fa5SApple OSS Distributions<p> 4*e13b1fa5SApple OSS Distributions<strong>Function</strong> - Perform periodic PC sampling for a thread. 5*e13b1fa5SApple OSS Distributions<h3>SYNOPSIS</h3> 6*e13b1fa5SApple OSS Distributions<pre> 7*e13b1fa5SApple OSS Distributions<strong>kern_return_t thread_sample</strong> 8*e13b1fa5SApple OSS Distributions <strong>(thread_act_t</strong> <var>sample_thread</var>, 9*e13b1fa5SApple OSS Distributions <strong>mach_port_make_send_t</strong> <var>reply_port</var><strong>);</strong> 10*e13b1fa5SApple OSS Distributions</pre> 11*e13b1fa5SApple OSS Distributions<h3>PARAMETERS</h3> 12*e13b1fa5SApple OSS Distributions<dl> 13*e13b1fa5SApple OSS Distributions<p> 14*e13b1fa5SApple OSS Distributions<dt> <var>sample_thread</var> 15*e13b1fa5SApple OSS Distributions<dd> 16*e13b1fa5SApple OSS Distributions[in thread send right] 17*e13b1fa5SApple OSS DistributionsThread whose PC is to be sampled 18*e13b1fa5SApple OSS Distributions<p> 19*e13b1fa5SApple OSS Distributions<dt> <var>reply_port</var> 20*e13b1fa5SApple OSS Distributions<dd> 21*e13b1fa5SApple OSS Distributions[in sample receive (to be converted to send) right] 22*e13b1fa5SApple OSS DistributionsPort to which PC 23*e13b1fa5SApple OSS Distributionssample buffers are sent. A value of <strong>MACH_PORT_NULL</strong> stops PC 24*e13b1fa5SApple OSS Distributionssampling for the thread. 25*e13b1fa5SApple OSS Distributions</dl> 26*e13b1fa5SApple OSS Distributions<h3>DESCRIPTION</h3> 27*e13b1fa5SApple OSS Distributions<p> 28*e13b1fa5SApple OSS DistributionsThe <strong>thread_sample</strong> function causes the program counter 29*e13b1fa5SApple OSS Distributions(PC) of the specified 30*e13b1fa5SApple OSS Distributions<var>sample_thread</var> to be sampled periodically (whenever the thread happens to be 31*e13b1fa5SApple OSS Distributionsrunning at the time of the kernel's "hardclock" interrupt). 32*e13b1fa5SApple OSS DistributionsThe set of PC sample 33*e13b1fa5SApple OSS Distributionsvalues obtained are saved in buffers which are sent to the specified 34*e13b1fa5SApple OSS Distributions<var>reply_port</var> in 35*e13b1fa5SApple OSS Distributions<strong>receive_samples</strong> messages. 36*e13b1fa5SApple OSS Distributions<h3>RETURN VALUES</h3> 37*e13b1fa5SApple OSS Distributions<p> 38*e13b1fa5SApple OSS DistributionsOnly generic errors apply. 39*e13b1fa5SApple OSS Distributions<h3>RELATED INFORMATION</h3> 40*e13b1fa5SApple OSS Distributions<p> 41*e13b1fa5SApple OSS DistributionsFunctions: 42*e13b1fa5SApple OSS Distributions<a href="task_sample.html"><strong>task_sample</strong></a>, 43*e13b1fa5SApple OSS Distributions<a href="receive_samples.html"><strong>receive_samples</strong></a>. 44