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

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

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

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

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

43       The pthread_attr_setschedpolicy() function shall fail if:
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45       ENOTSUP
46              An  attempt  was  made  to  set  the attribute to an unsupported
47              value.
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49       The pthread_attr_setschedpolicy() function may fail if:
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51       EINVAL The value of policy is not valid.
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53       These functions shall not return an error code of [EINTR].
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55       The following sections are informative.
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EXAMPLES

58       None.
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APPLICATION USAGE

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

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

75       None.
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SEE ALSO

78       pthread_attr_destroy(), pthread_attr_getscope(), pthread_attr_getinher‐
79       itsched(), pthread_attr_getschedparam(), pthread_create()
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81       The Base Definitions volume of POSIX.1‐2017, <pthread.h>, <sched.h>
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84       Portions  of  this text are reprinted and reproduced in electronic form
85       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
86       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
87       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
88       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
89       event of any discrepancy between this version and the original IEEE and
90       The  Open Group Standard, the original IEEE and The Open Group Standard
91       is the referee document. The original Standard can be  obtained  online
92       at http://www.opengroup.org/unix/online.html .
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94       Any  typographical  or  formatting  errors that appear in this page are
95       most likely to have been introduced during the conversion of the source
96       files  to  man page format. To report such errors, see https://www.ker
97       nel.org/doc/man-pages/reporting_bugs.html .
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101IEEE/The Open Group                  2017      PTHREAD_ATTR_GETSCHEDPOLICY(3P)
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