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<HTML
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>Execution Scheduling [POSIX Section 13]</TITLE
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><H1
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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
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>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
></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&#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
></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&#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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1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
4			`<!-- or later (the latest version is presently available at -->`
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6			`<!-- Distribution of the work or derivative of the work in any -->`
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8			`<!-- permission is obtained from the copyright holder. -->`
9			`<HTML`
10			`><HEAD`
11			`><TITLE`
12			`>Execution Scheduling [POSIX Section 13]</TITLE`
13			`><meta name="MSSmartTagsPreventParsing" content="TRUE">`
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22			`TITLE="POSIX Standard Support"`
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24			`REL="PREVIOUS"`
25			`TITLE="Memory Management [POSIX Section 12]"`
26			`HREF="posix-memory-management.html"><LINK`
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45			`><TR`
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47			`COLSPAN="3"`
48			`ALIGN="center"`
49			`>eCos Reference Manual</TH`
50			`></TR`
51			`><TR`
52			`><TD`
53			`WIDTH="10%"`
54			`ALIGN="left"`
55			`VALIGN="bottom"`
56			`><A`
57			`HREF="posix-memory-management.html"`
58			`ACCESSKEY="P"`
59			`>Prev</A`
60			`></TD`
61			`><TD`
62			`WIDTH="80%"`
63			`ALIGN="center"`
64			`VALIGN="bottom"`
65			`>Chapter 31. POSIX Standard Support</TD`
66			`><TD`
67			`WIDTH="10%"`
68			`ALIGN="right"`
69			`VALIGN="bottom"`
70			`><A`
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80			`><DIV`
81			`CLASS="SECT1"`
82			`><H1`
83			`CLASS="SECT1"`
84			`><A`
85			`NAME="POSIX-EXECUTION-SCHEDULING">Execution Scheduling [POSIX Section 13]</H1`
86			`><DIV`
87			`CLASS="SECT2"`
88			`><H2`
89			`CLASS="SECT2"`
90			`><A`
91			`NAME="AEN13195">Functions Implemented</H2`
92			`><TABLE`
93			`BORDER="5"`
94			`BGCOLOR="#E0E0F0"`
95			`WIDTH="70%"`
96			`><TR`
97			`><TD`
98			`><PRE`
99			`CLASS="SCREEN"`
100			`>int sched_yield(void);`
101			`int sched_get_priority_max(int policy);`
102			`int sched_get_priority_min(int policy);`
103			`int sched_rr_get_interval(pid_t pid, struct timespec *t);`
104			`int pthread_attr_setscope(pthread_attr_t *attr, int scope);`
105			`int pthread_attr_getscope(const pthread_attr_t attr, int scope);`
106			`int pthread_attr_setinheritsched(pthread_attr_t *attr, int inherit);`
107			`int pthread_attr_getinheritsched(const pthread_attr_t attr, int inherit);`
108			`int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy);`
109			`int pthread_attr_getschedpolicy(const pthread_attr_t attr, int policy);`
110			`int pthread_attr_setschedparam( pthread_attr_t attr, const struct sched_param param);`
111			`int pthread_attr_getschedparam( const pthread_attr_t *attr,`
112			`struct sched_param *param);`
113			`int pthread_setschedparam(pthread_t thread, int policy,`
114			`const struct sched_param *param);`
115			`int pthread_getschedparam(pthread_t thread, int *policy,`
116			`struct sched_param *param);`
117			`int pthread_mutexattr_setprotocol( pthread_mutexattr_t *attr,`
118			`int protocol);`
119			`int pthread_mutexattr_getprotocol( pthread_mutexattr_t *attr,`
120			`int *protocol);`
121			`int pthread_mutexattr_setprioceiling( pthread_mutexattr_t *attr,`
122			`int prioceiling);`
123			`int pthread_mutexattr_getprioceiling( pthread_mutexattr_t *attr,`
124			`int *prioceiling);`
125			`int pthread_mutex_setprioceiling( pthread_mutex_t *mutex,`
126			`int prioceiling,`
127			`int *old_ceiling);`
128			`int pthread_mutex_getprioceiling( pthread_mutex_t *mutex,`
129			`int *prioceiling);</PRE`
130			`></TD`
131			`></TR`
132			`></TABLE`
133			`></DIV`
134			`><DIV`
135			`CLASS="SECT2"`
136			`><H2`
137			`CLASS="SECT2"`
138			`><A`
139			`NAME="AEN13198">Functions Omitted</H2`
140			`><TABLE`
141			`BORDER="5"`
142			`BGCOLOR="#E0E0F0"`
143			`WIDTH="70%"`
144			`><TR`
145			`><TD`
146			`><PRE`
147			`CLASS="SCREEN"`
148			`>int sched_setparam(pid_t pid, const struct sched_param *param);`
149			`int sched_getparam(pid_t pid, struct sched_param *param);`
150			`int sched_setscheduler(pid_t pid, int policy,`
151			`const struct sched_param *param);`
152			`int sched_getscheduler(pid_t pid);</PRE`
153			`></TD`
154			`></TR`
155			`></TABLE`
156			`></DIV`
157			`><DIV`
158			`CLASS="SECT2"`
159			`><H2`
160			`CLASS="SECT2"`
161			`><A`
162			`NAME="AEN13201">Notes</H2`
163			`><P`
164			`></P`
165			`><UL`
166			`><LI`
167			`><P`
168			`> The functions <SPAN`
169			`CLASS="emphasis"`
170			`><I`
171			`CLASS="EMPHASIS"`
172			`>sched_setparam()</I`
173			`></SPAN`
174			`>,`
175			`<SPAN`
176			`CLASS="emphasis"`
177			`><I`
178			`CLASS="EMPHASIS"`
179			`>sched_getparam()</I`
180			`></SPAN`
181			`>,`
182			`<SPAN`
183			`CLASS="emphasis"`
184			`><I`
185			`CLASS="EMPHASIS"`
186			`>sched_setscheduler()</I`
187			`></SPAN`
188			`> and`
189			`<SPAN`
190			`CLASS="emphasis"`
191			`><I`
192			`CLASS="EMPHASIS"`
193			`>sched_getscheduler()</I`
194			`></SPAN`
195			`> are present`
196			`but always return an error.`
197			`</P`
198			`></LI`
199			`><LI`
200			`><P`
201			`> The scheduler policy <SPAN`
202			`CLASS="emphasis"`
203			`><I`
204			`CLASS="EMPHASIS"`
205			`>SCHED_OTHER</I`
206			`></SPAN`
207			`> is`
208			`equivalent to <SPAN`
209			`CLASS="emphasis"`
210			`><I`
211			`CLASS="EMPHASIS"`
212			`>SCHED_RR</I`
213			`></SPAN`
214			`>.`
215			`</P`
216			`></LI`
217			`><LI`
218			`><P`
219			`> Only <SPAN`
220			`CLASS="emphasis"`
221			`><I`
222			`CLASS="EMPHASIS"`
223			`>PTHREAD_SCOPE_SYSTEM</I`
224			`></SPAN`
225			`>`
226			`is supported as a`
227			`<SPAN`
228			`CLASS="strong"`
229			`><B`
230			`CLASS="EMPHASIS"`
231			`>contentionscope</B`
232			`></SPAN`
233			`>`
234			`attribute.`
235			`</P`
236			`></LI`
237			`><LI`
238			`><P`
239			`> The default thread scheduling attributes are:`
240			`<TABLE`
241			`BORDER="5"`
242			`BGCOLOR="#E0E0F0"`
243			`WIDTH="70%"`
244			`><TR`
245			`><TD`
246			`><PRE`
247			`CLASS="SCREEN"`
248			`> contentionscope PTHREAD_SCOPE_SYSTEM`
249			`inheritsched PTHREAD_INHERIT_SCHED`
250			`schedpolicy SCHED_OTHER`
251			`schedparam.sched 0`
252			`</PRE`
253			`></TD`
254			`></TR`
255			`></TABLE`
256			`>`
257			`</P`
258			`></LI`
259			`><LI`
260			`><P`
261			`> Mutex priority inversion protection is controlled by a`
262			`number of kernel configuration options.`
263			`If CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_INHERIT`
264			`is defined then`
265			`{_POSIX_THREAD_PRIO_INHERIT}`
266			`will be defined and PTHREAD_PRIO_INHERIT may`
267			`be set as the protocol in a`
268			`<SPAN`
269			`CLASS="emphasis"`
270			`><I`
271			`CLASS="EMPHASIS"`
272			`>pthread_mutexattr_t</I`
273			`></SPAN`
274			`>`
275			`object.`
276			`If CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING`
277			`is defined then`
278			`{_POSIX_THREAD_PRIO_PROTECT}`
279			`will be defined and PTHREAD_PRIO_PROTECT may`
280			`be set as the protocol in a`
281			`<SPAN`
282			`CLASS="emphasis"`
283			`><I`
284			`CLASS="EMPHASIS"`
285			`>pthread_mutexattr_t</I`
286			`></SPAN`
287			`> object.`
288			`</P`
289			`></LI`
290			`><LI`
291			`><P`
292			`> The default attribute values set by`
293			`<SPAN`
294			`CLASS="emphasis"`
295			`><I`
296			`CLASS="EMPHASIS"`
297			`>pthread_mutexattr_init()</I`
298			`></SPAN`
299			`>`
300			`is to set the protocol attribute to`
301			`PTHREAD_PRIO_NONE and the prioceiling`
302			`attribute to zero.`
303			`</P`
304			`></LI`
305			`></UL`
306			`></DIV`
307			`></DIV`
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349			`WIDTH="33%"`
350			`ALIGN="left"`
351			`VALIGN="top"`
352			`>Memory Management [POSIX Section 12]</TD`
353			`><TD`
354			`WIDTH="34%"`
355			`ALIGN="center"`
356			`VALIGN="top"`
357			`><A`
358			`HREF="posix-standard-support.html"`
359			`ACCESSKEY="U"`
360			`>Up</A`
361			`></TD`
362			`><TD`
363			`WIDTH="33%"`
364			`ALIGN="right"`
365			`VALIGN="top"`
366			`>Clocks and Timers [POSIX Section 14]</TD`
367			`></TR`
368			`></TABLE`
369			`></DIV`
370			`></BODY`
371			`></HTML`
372			`>`

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