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>Execution Scheduling [POSIX Section 13]</TITLE
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><A
NAME="POSIX-EXECUTION-SCHEDULING">Execution Scheduling &#0091;POSIX Section 13&#0093;</H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN13195">Functions Implemented</H2
><TABLE
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>int sched&#0095;yield(void); 
int sched&#0095;get&#0095;priority&#0095;max(int policy); 
int sched&#0095;get&#0095;priority&#0095;min(int policy); 
int sched&#0095;rr&#0095;get&#0095;interval(pid&#0095;t pid, struct timespec &#0042;t); 
int pthread&#0095;attr&#0095;setscope(pthread&#0095;attr&#0095;t &#0042;attr, int scope); 
int pthread&#0095;attr&#0095;getscope(const pthread&#0095;attr&#0095;t &#0042;attr, int &#0042;scope); 
int pthread&#0095;attr&#0095;setinheritsched(pthread&#0095;attr&#0095;t &#0042;attr, int inherit); 
int pthread&#0095;attr&#0095;getinheritsched(const pthread&#0095;attr&#0095;t &#0042;attr, int &#0042;inherit); 
int pthread&#0095;attr&#0095;setschedpolicy(pthread&#0095;attr&#0095;t &#0042;attr, int policy); 
int pthread&#0095;attr&#0095;getschedpolicy(const pthread&#0095;attr&#0095;t &#0042;attr, int &#0042;policy);
int pthread&#0095;attr&#0095;setschedparam( pthread&#0095;attr&#0095;t &#0042;attr, const struct sched&#0095;param &#0042;param); 
int pthread&#0095;attr&#0095;getschedparam( const pthread&#0095;attr&#0095;t &#0042;attr,
	                        struct sched&#0095;param &#0042;param); 
int pthread&#0095;setschedparam(pthread&#0095;t thread, int policy,
	                  const struct sched&#0095;param &#0042;param); 
int pthread&#0095;getschedparam(pthread&#0095;t thread, int &#0042;policy,
	                  struct sched&#0095;param &#0042;param); 
int pthread&#0095;mutexattr&#0095;setprotocol( pthread&#0095;mutexattr&#0095;t &#0042;attr,
                                   int protocol);
int pthread&#0095;mutexattr&#0095;getprotocol( pthread&#0095;mutexattr&#0095;t &#0042;attr,
                                   int &#0042;protocol); 
int pthread&#0095;mutexattr&#0095;setprioceiling( pthread&#0095;mutexattr&#0095;t &#0042;attr,
                                      int prioceiling); 
int pthread&#0095;mutexattr&#0095;getprioceiling( pthread&#0095;mutexattr&#0095;t &#0042;attr,
	                              int &#0042;prioceiling);
int pthread&#0095;mutex&#0095;setprioceiling( pthread&#0095;mutex&#0095;t &#0042;mutex,
	                          int prioceiling,
	                          int &#0042;old&#0095;ceiling); 
int pthread&#0095;mutex&#0095;getprioceiling( pthread&#0095;mutex&#0095;t &#0042;mutex,
                                  int &#0042;prioceiling);</PRE
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CLASS="SECT2"
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CLASS="SECT2"
><A
NAME="AEN13198">Functions Omitted</H2
><TABLE
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><PRE
CLASS="SCREEN"
>int sched&#0095;setparam(pid&#0095;t pid, const struct sched&#0095;param &#0042;param); 
int sched&#0095;getparam(pid&#0095;t pid, struct sched&#0095;param &#0042;param); 
int sched&#0095;setscheduler(pid&#0095;t pid, int policy,
	               const struct sched&#0095;param &#0042;param); 
int sched&#0095;getscheduler(pid&#0095;t pid);</PRE
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CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN13201">Notes</H2
><P
></P
><UL
><LI
><P
>	  The functions <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>sched&#0095;setparam()</I
></SPAN
>, 
	  <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>sched&#0095;getparam()</I
></SPAN
>,
	  <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>sched&#0095;setscheduler()</I
></SPAN
> and
	  <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>sched&#0095;getscheduler()</I
></SPAN
> are present
	  but always return an error.
	  </P
></LI
><LI
><P
>	  The scheduler policy <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>SCHED&#0095;OTHER</I
></SPAN
> is
	  equivalent to <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>SCHED&#0095;RR</I
></SPAN
>.
	  </P
></LI
><LI
><P
>	  Only <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>PTHREAD&#0095;SCOPE&#0095;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&#0095;SCOPE&#0095;SYSTEM
	  inheritsched             PTHREAD&#0095;INHERIT&#0095;SCHED
	  schedpolicy              SCHED&#0095;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&#0095;KERNEL&#0095;SYNCH&#0095;MUTEX&#0095;PRIORITY&#0095;INVERSION&#0095;PROTOCOL&#0095;INHERIT
	  is defined then
	  &#0123;&#0095;POSIX&#0095;THREAD&#0095;PRIO&#0095;INHERIT&#0125;
	  will be defined and PTHREAD&#0095;PRIO&#0095;INHERIT may
	  be set as the protocol in a
	  <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>pthread&#0095;mutexattr&#0095;t</I
></SPAN
>
	  object.
	  If CYGSEM&#0095;KERNEL&#0095;SYNCH&#0095;MUTEX&#0095;PRIORITY&#0095;INVERSION&#0095;PROTOCOL&#0095;CEILING
	  is defined then
	  &#0123;&#0095;POSIX&#0095;THREAD&#0095;PRIO&#0095;PROTECT&#0125;
	  will be defined and PTHREAD&#0095;PRIO&#0095;PROTECT may
	  be set as the protocol in a
	  <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>pthread&#0095;mutexattr&#0095;t</I
></SPAN
> object.
          </P
></LI
><LI
><P
>	  The default attribute values set by
	  <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>pthread&#0095;mutexattr&#0095;init()</I
></SPAN
>
	  is to set the protocol attribute to
	  PTHREAD&#0095;PRIO&#0095;NONE and the prioceiling
	  attribute to zero.
	  </P
></LI
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