[apple/xnu.git] / osfmk / man / policy_rr_info.html

<h2>policy_rr_info</h2>\r<hr>\r<p>\r<strong>Structure</strong> - Specifies information associated with the system's Round Robin scheduling policy.\r<h3>SYNOPSIS</h3>\r<pre>\r<strong>struct policy_rr_limit</strong>\r<strong>{</strong>\r       <strong>int</strong>          <var>max_priority</var><strong>;</strong>\r<strong>};</strong>\r\r<strong>struct policy_rr_base</strong>\r<strong>{</strong>\r       <strong>int</strong>         <var>base_priority</var><strong>;</strong>\r       <strong>int</strong>               <var>quantum</var><strong>;</strong>\r<strong>};</strong>\r\r<strong>struct policy_rr_info</strong>\r<strong>{</strong>\r       <strong>int</strong>          <var>max_priority</var><strong>;</strong>\r       <strong>int</strong>         <var>base_priority</var><strong>;</strong>\r       <strong>int</strong>               <var>quantum</var><strong>;</strong>\r       <strong>boolean_t</strong>       <var>depressed</var><strong>;</strong>\r       <strong>int</strong>      <var>depress_priority</var><strong>;</strong>\r<strong>};</strong>\r</pre>\r<h3>FIELDS</h3>\r<dl>\r<dt> <var>max_priority</var>\r<dd>\rMaximum scheduling priority\r<p>\r<dt> <var>base_priority</var>\r<dd>\rScheduling priority\r<p>\r<dt> <var>quantum</var>\r<dd>\rScheduling quantum (in milliseconds)\r<p>\r<dt> <var>depressed</var>\r<dd>\rTrue if scheduling priority is depressed\r<p>\r<dt> <var>depress_priority</var>\r<dd>\rScheduling priority from which depressed\r</dl>\r<h3>DESCRIPTION</h3>\r<p>\rThe <strong>policy_rr_info</strong> structure defines the round-robin\rscheduling policy information.\rRound-robin threads have two priorities associated with them by the system:\r<ul>\r  <p>\r<li>\rA maximum priority value which can be raised only via privileged operation \rso that users may not unfairly compete with other users in their processor \rset.  Newly created threads obtain their maximum priority from that of their \rassigned processor set.\r     <p>\r<li>\rA priority value which can be set by the thread to any value up to a\rmaximum priority.  Newly created threads obtain their priority from their task.\r</ul>\r<h3>RELATED INFORMATION</h3>\r<p>\rFunctions:\r<a href="thread_info.html"><strong>thread_info</strong></a>,\r<a href="task_info.html"><strong>task_info</strong></a>,\r<a href="processor_set_info.html"><strong>processor_set_info</strong></a>,\r<a href="P_set_policy_control.html"><strong>processor_set_policy_control</strong></a>,\r<a href="P_set_policy_disable.html"><strong>processor_set_policy_disable</strong></a>,\r<a href="P_set_policy_enable.html"><strong>processor_set_policy_enable</strong></a>,\r<a href="task_policy.html"><strong>task_policy</strong></a>,\r<a href="thread_policy.html"><strong>thread_policy</strong></a>,\r<a href="thread_set_policy.html"><strong>thread_set_policy</strong></a>.\r<p>\rData Structures:\r<a href="policy_fifo_info.html"><strong>policy_fifo_info</strong></a>,\r<a href="policy_timeshare_info.html"><strong>policy_timeshare_info</strong></a>.\r