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+><HEAD
+><TITLE
+>Execution Scheduling [POSIX Section 13]</TITLE
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+TITLE="POSIX Standard Support"
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+TITLE="Memory Management [POSIX Section 12]"
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+>eCos Reference Manual</TH
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+><TR
+><TD
+WIDTH="10%"
+ALIGN="left"
+VALIGN="bottom"
+><A
+HREF="posix-memory-management.html"
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+>Prev</A
+></TD
+><TD
+WIDTH="80%"
+ALIGN="center"
+VALIGN="bottom"
+>Chapter 31. POSIX Standard Support</TD
+><TD
+WIDTH="10%"
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+VALIGN="bottom"
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+ACCESSKEY="N"
+>Next</A
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+><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
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