1PTHREAD_ATTR_GETSCHEDPARAM(3PPO)SIX Programmer's ManPuTaHlREAD_ATTR_GETSCHEDPARAM(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_getschedparam, pthread_attr_setschedparam -  get  and  set
13       the schedparam attribute
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SYNOPSIS

16       #include <pthread.h>
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18       int pthread_attr_getschedparam(const pthread_attr_t *restrict attr,
19              struct sched_param *restrict param);
20       int pthread_attr_setschedparam(pthread_attr_t *restrict attr,
21              const struct sched_param *restrict param);
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DESCRIPTION

25       The   pthread_attr_getschedparam(),   and  pthread_attr_setschedparam()
26       functions, respectively, shall get and  set  the  scheduling  parameter
27       attributes  in  the  attr argument. The contents of the param structure
28       are defined in the <sched.h> header.  For the SCHED_FIFO  and  SCHED_RR
29       policies, the only required member of param is sched_priority.
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31       For the SCHED_SPORADIC policy, the required members of the param struc‐
32       ture are sched_priority,  sched_ss_low_priority,  sched_ss_repl_period,
33       sched_ss_init_budget,     and    sched_ss_max_repl.    The    specified
34       sched_ss_repl_period must be greater than or  equal  to  the  specified
35       sched_ss_init_budget  for  the  function to succeed; if it is not, then
36       the function shall fail. The value of sched_ss_max_repl shall be within
37       the  inclusive range [1, {SS_REPL_MAX}] for the function to succeed; if
38       not, the function shall fail.
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RETURN VALUE

41       If      successful,      the      pthread_attr_getschedparam()      and
42       pthread_attr_setschedparam() functions shall return zero; otherwise, an
43       error number shall be returned to indicate the error.
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ERRORS

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

60       None.
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APPLICATION USAGE

63       After  these attributes have been set, a thread can be created with the
64       specified attributes using pthread_create(). Using these routines  does
65       not affect the current running thread.
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RATIONALE

68       None.
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FUTURE DIRECTIONS

71       None.
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SEE ALSO

74       pthread_attr_destroy(), pthread_attr_getscope(), pthread_attr_getinher‐
75       itsched(), pthread_attr_getschedpolicy(),  pthread_create(),  the  Base
76       Definitions volume of IEEE Std 1003.1-2001, <pthread.h>, <sched.h>
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79       Portions  of  this text are reprinted and reproduced in electronic form
80       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
81       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
82       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
83       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
84       event of any discrepancy between this version and the original IEEE and
85       The  Open Group Standard, the original IEEE and The Open Group Standard
86       is the referee document. The original Standard can be  obtained  online
87       at http://www.opengroup.org/unix/online.html .
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91IEEE/The Open Group                  2003       PTHREAD_ATTR_GETSCHEDPARAM(3P)
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