NAME

       pthread_attr_getschedparam,  pthread_attr_setschedparam  -  get  and  set  the  schedparam
       attribute

SYNOPSIS

       #include <pthread.h>

       int pthread_attr_getschedparam(const pthread_attr_t *restrict attr,
              struct sched_param *restrict param);
       int pthread_attr_setschedparam(pthread_attr_t *restrict attr,
              const struct sched_param *restrict param);

DESCRIPTION

       The    pthread_attr_getschedparam(),    and    pthread_attr_setschedparam()     functions,
       respectively,  shall get and set the scheduling parameter attributes in the attr argument.
       The contents of the param  structure  are  defined  in  the  <sched.h>  header.   For  the
       SCHED_FIFO and SCHED_RR policies, the only required member of param is sched_priority.

       For   the  SCHED_SPORADIC  policy,  the  required  members  of  the  param  structure  are
       sched_priority,  sched_ss_low_priority,  sched_ss_repl_period,  sched_ss_init_budget,  and
       sched_ss_max_repl. The specified sched_ss_repl_period must be greater than or equal to the
       specified sched_ss_init_budget for the function  to  succeed;  if  it  is  not,  then  the
       function  shall  fail.  The value of sched_ss_max_repl shall be within the inclusive range
       [1, {SS_REPL_MAX}] for the function to succeed; if not, the function shall fail.

RETURN VALUE

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

ERRORS

       The pthread_attr_setschedparam() function may fail if:

       EINVAL The value of param is not valid.

       ENOTSUP
              An attempt was made to set the attribute to an unsupported value.

       These functions shall not return an error code of [EINTR].

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

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

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       pthread_attr_destroy()   ,   pthread_attr_getscope()  ,  pthread_attr_getinheritsched()  ,
       pthread_attr_getschedpolicy()  ,  pthread_create()  ,  the  Base  Definitions  volume   of
       IEEE Std 1003.1-2001, <pthread.h>, <sched.h>

COPYRIGHT

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable  Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group  Standard  is  the  referee  document.  The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .