1PTHREAD_ATTR_GETSCHEDPOLICY(P3OPS)IX Programmer's MaPnTuHaRlEAD_ATTR_GETSCHEDPOLICY(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

13       pthread_attr_getschedpolicy, pthread_attr_setschedpolicy — get and  set
14       the schedpolicy attribute (REALTIME THREADS)
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SYNOPSIS

17       #include <pthread.h>
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19       int pthread_attr_getschedpolicy(const pthread_attr_t *restrict attr,
20           int *restrict policy);
21       int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy);
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DESCRIPTION

24       The   pthread_attr_getschedpolicy()  and  pthread_attr_setschedpolicy()
25       functions, respectively, shall get and set the schedpolicy attribute in
26       the attr argument.
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28       The  supported values of policy shall include SCHED_FIFO, SCHED_RR, and
29       SCHED_OTHER, which are defined in the <sched.h>  header.  When  threads
30       executing   with   the   scheduling  policy  SCHED_FIFO,  SCHED_RR,  or
31       SCHED_SPORADIC are waiting on a mutex, they shall acquire the mutex  in
32       priority order when the mutex is unlocked.
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34       The  behavior  is undefined if the value specified by the attr argument
35       to pthread_attr_getschedpolicy() or pthread_attr_setschedpolicy()  does
36       not refer to an initialized thread attributes object.
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RETURN VALUE

39       If      successful,      the      pthread_attr_getschedpolicy()     and
40       pthread_attr_setschedpolicy() functions shall return  zero;  otherwise,
41       an error number shall be returned to indicate the error.
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ERRORS

44       The pthread_attr_setschedpolicy() function shall fail if:
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46       ENOTSUP
47              An  attempt  was  made  to  set  the attribute to an unsupported
48              value.
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50       The pthread_attr_setschedpolicy() function may fail if:
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52       EINVAL The value of policy is not valid.
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54       These functions shall not return an error code of [EINTR].
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56       The following sections are informative.
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EXAMPLES

59       None.
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APPLICATION USAGE

62       After these attributes have been set, a thread can be created with  the
63       specified attributes using pthread_create().  Using these routines does
64       not affect the current running thread.
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66       See Section 2.9.4, Thread Scheduling  for  further  details  on  thread
67       scheduling attributes and their default settings.
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RATIONALE

70       If an implementation detects that the value specified by the attr argu‐
71       ment to pthread_attr_getschedpolicy() or  pthread_attr_setschedpolicy()
72       does not refer to an initialized thread attributes object, it is recom‐
73       mended that the function should fail and report an [EINVAL] error.
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FUTURE DIRECTIONS

76       None.
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SEE ALSO

79       pthread_attr_destroy(), pthread_attr_getscope(), pthread_attr_getinher‐
80       itsched(), pthread_attr_getschedparam(), pthread_create()
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82       The Base Definitions volume of POSIX.1‐2008, <pthread.h>, <sched.h>
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85       Portions  of  this text are reprinted and reproduced in electronic form
86       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
87       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
88       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
89       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
90       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
91       event of any discrepancy between this version and the original IEEE and
92       The Open Group Standard, the original IEEE and The Open Group  Standard
93       is  the  referee document. The original Standard can be obtained online
94       at http://www.unix.org/online.html .
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96       Any typographical or formatting errors that appear  in  this  page  are
97       most likely to have been introduced during the conversion of the source
98       files to man page format. To report such errors,  see  https://www.ker‐
99       nel.org/doc/man-pages/reporting_bugs.html .
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103IEEE/The Open Group                  2013      PTHREAD_ATTR_GETSCHEDPOLICY(3P)
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