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PTHREAD_ATTR_GETSCHEDPARAM(POSIX Programmer's ManPTHREAD_ATTR_GETSCHEDPARAM(P)



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

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 struc-
       ture 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_get-
       inheritsched() , 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 .



IEEE/The Open Group		     2003	 PTHREAD_ATTR_GETSCHEDPARAM(P)
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