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<!-- Copyright (C) 2003 Red Hat, Inc. --> <!-- This material may be distributed only subject to the terms --> <!-- and conditions set forth in the Open Publication License, v1.0 --> <!-- or later (the latest version is presently available at --> <!-- http://www.opencontent.org/openpub/). --> <!-- Distribution of the work or derivative of the work in any --> <!-- standard (paper) book form is prohibited unless prior --> <!-- permission is obtained from the copyright holder. --> <HTML ><HEAD ><TITLE >Execution Scheduling [POSIX Section 13]</TITLE ><meta name="MSSmartTagsPreventParsing" content="TRUE"> <META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ "><LINK REL="HOME" TITLE="eCos Reference Manual" HREF="ecos-ref.html"><LINK REL="UP" TITLE="POSIX Standard Support" HREF="posix-standard-support.html"><LINK REL="PREVIOUS" TITLE="Memory Management [POSIX Section 12]" HREF="posix-memory-management.html"><LINK REL="NEXT" TITLE="Clocks and Timers [POSIX Section 14]" HREF="posix-clocks-and-timers.html"></HEAD ><BODY CLASS="SECT1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >eCos Reference Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="posix-memory-management.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 31. POSIX Standard Support</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="posix-clocks-and-timers.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="POSIX-EXECUTION-SCHEDULING">Execution Scheduling [POSIX Section 13]</H1 ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN13195">Functions Implemented</H2 ><TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" >int sched_yield(void); int sched_get_priority_max(int policy); int sched_get_priority_min(int policy); int sched_rr_get_interval(pid_t pid, struct timespec *t); int pthread_attr_setscope(pthread_attr_t *attr, int scope); int pthread_attr_getscope(const pthread_attr_t *attr, int *scope); int pthread_attr_setinheritsched(pthread_attr_t *attr, int inherit); int pthread_attr_getinheritsched(const pthread_attr_t *attr, int *inherit); int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy); int pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy); int pthread_attr_setschedparam( pthread_attr_t *attr, const struct sched_param *param); int pthread_attr_getschedparam( const pthread_attr_t *attr, struct sched_param *param); int pthread_setschedparam(pthread_t thread, int policy, const struct sched_param *param); int pthread_getschedparam(pthread_t thread, int *policy, struct sched_param *param); int pthread_mutexattr_setprotocol( pthread_mutexattr_t *attr, int protocol); int pthread_mutexattr_getprotocol( pthread_mutexattr_t *attr, int *protocol); int pthread_mutexattr_setprioceiling( pthread_mutexattr_t *attr, int prioceiling); int pthread_mutexattr_getprioceiling( pthread_mutexattr_t *attr, int *prioceiling); int pthread_mutex_setprioceiling( pthread_mutex_t *mutex, int prioceiling, int *old_ceiling); int pthread_mutex_getprioceiling( pthread_mutex_t *mutex, int *prioceiling);</PRE ></TD ></TR ></TABLE ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN13198">Functions Omitted</H2 ><TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" >int sched_setparam(pid_t pid, const struct sched_param *param); int sched_getparam(pid_t pid, struct sched_param *param); int sched_setscheduler(pid_t pid, int policy, const struct sched_param *param); int sched_getscheduler(pid_t pid);</PRE ></TD ></TR ></TABLE ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN13201">Notes</H2 ><P ></P ><UL ><LI ><P > The functions <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >sched_setparam()</I ></SPAN >, <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >sched_getparam()</I ></SPAN >, <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >sched_setscheduler()</I ></SPAN > and <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >sched_getscheduler()</I ></SPAN > are present but always return an error. </P ></LI ><LI ><P > The scheduler policy <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >SCHED_OTHER</I ></SPAN > is equivalent to <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >SCHED_RR</I ></SPAN >. </P ></LI ><LI ><P > Only <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >PTHREAD_SCOPE_SYSTEM</I ></SPAN > is supported as a <SPAN CLASS="strong" ><B CLASS="EMPHASIS" >contentionscope</B ></SPAN > attribute. </P ></LI ><LI ><P > The default thread scheduling attributes are: <TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" > contentionscope PTHREAD_SCOPE_SYSTEM inheritsched PTHREAD_INHERIT_SCHED schedpolicy SCHED_OTHER schedparam.sched 0 </PRE ></TD ></TR ></TABLE > </P ></LI ><LI ><P > Mutex priority inversion protection is controlled by a number of kernel configuration options. If CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_INHERIT is defined then {_POSIX_THREAD_PRIO_INHERIT} will be defined and PTHREAD_PRIO_INHERIT may be set as the protocol in a <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >pthread_mutexattr_t</I ></SPAN > object. If CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING is defined then {_POSIX_THREAD_PRIO_PROTECT} will be defined and PTHREAD_PRIO_PROTECT may be set as the protocol in a <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >pthread_mutexattr_t</I ></SPAN > object. </P ></LI ><LI ><P > The default attribute values set by <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >pthread_mutexattr_init()</I ></SPAN > is to set the protocol attribute to PTHREAD_PRIO_NONE and the prioceiling attribute to zero. </P ></LI ></UL ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="posix-memory-management.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ecos-ref.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="posix-clocks-and-timers.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Memory Management [POSIX Section 12]</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="posix-standard-support.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Clocks and Timers [POSIX Section 14]</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
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