1*0f4c859eSApple OSS Distributions<h2>thread_sample</h2> 2*0f4c859eSApple OSS Distributions<hr> 3*0f4c859eSApple OSS Distributions<p> 4*0f4c859eSApple OSS Distributions<strong>Function</strong> - Perform periodic PC sampling for a thread. 5*0f4c859eSApple OSS Distributions<h3>SYNOPSIS</h3> 6*0f4c859eSApple OSS Distributions<pre> 7*0f4c859eSApple OSS Distributions<strong>kern_return_t thread_sample</strong> 8*0f4c859eSApple OSS Distributions <strong>(thread_act_t</strong> <var>sample_thread</var>, 9*0f4c859eSApple OSS Distributions <strong>mach_port_make_send_t</strong> <var>reply_port</var><strong>);</strong> 10*0f4c859eSApple OSS Distributions</pre> 11*0f4c859eSApple OSS Distributions<h3>PARAMETERS</h3> 12*0f4c859eSApple OSS Distributions<dl> 13*0f4c859eSApple OSS Distributions<p> 14*0f4c859eSApple OSS Distributions<dt> <var>sample_thread</var> 15*0f4c859eSApple OSS Distributions<dd> 16*0f4c859eSApple OSS Distributions[in thread send right] 17*0f4c859eSApple OSS DistributionsThread whose PC is to be sampled 18*0f4c859eSApple OSS Distributions<p> 19*0f4c859eSApple OSS Distributions<dt> <var>reply_port</var> 20*0f4c859eSApple OSS Distributions<dd> 21*0f4c859eSApple OSS Distributions[in sample receive (to be converted to send) right] 22*0f4c859eSApple OSS DistributionsPort to which PC 23*0f4c859eSApple OSS Distributionssample buffers are sent. A value of <strong>MACH_PORT_NULL</strong> stops PC 24*0f4c859eSApple OSS Distributionssampling for the thread. 25*0f4c859eSApple OSS Distributions</dl> 26*0f4c859eSApple OSS Distributions<h3>DESCRIPTION</h3> 27*0f4c859eSApple OSS Distributions<p> 28*0f4c859eSApple OSS DistributionsThe <strong>thread_sample</strong> function causes the program counter 29*0f4c859eSApple OSS Distributions(PC) of the specified 30*0f4c859eSApple OSS Distributions<var>sample_thread</var> to be sampled periodically (whenever the thread happens to be 31*0f4c859eSApple OSS Distributionsrunning at the time of the kernel's "hardclock" interrupt). 32*0f4c859eSApple OSS DistributionsThe set of PC sample 33*0f4c859eSApple OSS Distributionsvalues obtained are saved in buffers which are sent to the specified 34*0f4c859eSApple OSS Distributions<var>reply_port</var> in 35*0f4c859eSApple OSS Distributions<strong>receive_samples</strong> messages. 36*0f4c859eSApple OSS Distributions<h3>RETURN VALUES</h3> 37*0f4c859eSApple OSS Distributions<p> 38*0f4c859eSApple OSS DistributionsOnly generic errors apply. 39*0f4c859eSApple OSS Distributions<h3>RELATED INFORMATION</h3> 40*0f4c859eSApple OSS Distributions<p> 41*0f4c859eSApple OSS DistributionsFunctions: 42*0f4c859eSApple OSS Distributions<a href="task_sample.html"><strong>task_sample</strong></a>, 43*0f4c859eSApple OSS Distributions<a href="receive_samples.html"><strong>receive_samples</strong></a>. 44