pthread_setschedparam man page on OSF1

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pthread_setschedparam(3)			      pthread_setschedparam(3)

NAME
       pthread_setschedparam - Changes a thread's scheduling policy and sched‐
       uling parameters

SYNOPSIS
       #include <pthread.h>

       int pthread_setschedparam(
	       pthread_t thread,
	       int policy,
	       const struct sched_param *param );

LIBRARY
       DECthreads POSIX 1003.1c Library (libpthread.so)

STANDARDS
       interfaces documented on this reference page conform to industry	 stan‐
       dards as follows:

       IEEE Std 1003.1c-1995, POSIX System Application Program Interface

PARAMETERS
       Thread  whose  scheduling policy and parameters are to be changed.  New
       scheduling policy value for the thread specified in thread. The follow‐
       ing  are	 valid	values: SCHED_BG_NP SCHED_FG_NP SCHED_FIFO SCHED_OTHER
       SCHED_RR

	      See Guide to DECthreads for  a  description  of  the  scheduling
	      policies.	  New  values  of the scheduling parameters associated
	      with the scheduling policy for the thread specified  in  thread.
	      Valid  values  for  the  sched_priority  field  of a sched_param
	      structure depend on the chosen scheduling policy. Use the	 POSIX
	      routines	sched_get_priority_min(3) or sched_get_priority_max(3)
	      to determine the low and high limits of each  policy.  Addition‐
	      ally,  DECthreads provides nonportable priority range constants,
	      as follows: PRI_FIFO_MIN (low) to PRI_FIFO_MAX (high) PRI_RR_MIN
	      (low)  to PRI_RR_MAX (high) PRI_OTHER_MIN (low) to PRI_OTHER_MAX
	      (high) PRI_FG_MIN_NP (low) to PRI_FG_MAX_NP (high) PRI_BG_MIN_NP
	      (low) to PRI_BG_MAX_NP (high)

	      The  default  priority  varies  by DECthreads platform. On Tru64
	      UNIX, the default is 19 (that is, the POSIX priority of a normal
	      timeshare process).  On the non-UNIX platforms, the default pri‐
	      ority is the midpoint between PRI_FG_MIN_NP and PRI_FG_MAX_NP.

DESCRIPTION
       This routine changes both the current scheduling policy and  associated
       scheduling  parameters  of the thread specified by thread to the policy
       and associated parameters provided in policy and param, respectively.

       All currently  implemented  DECthreads  scheduling  policies  have  one
       scheduling  parameter called sched_priority. For the policy you choose,
       you must specify an appropriate value in the  sched_priority  field  of
       the sched_param structure.

       Changing	 the  scheduling  policy or priority, or both, of a thread can
       cause it to start executing or to be preempted  by  another  thread.  A
       thread changes its own scheduling policy and priority by using the han‐
       dle returned by the pthread_self(3) routine.

       This   routine	differs	  from	 pthread_attr_setschedpolicy(3)	   and
       pthread_attr_setschedparam(3),  in that those routines set the schedul‐
       ing policy and parameter attributes that	 are  used  to	establish  the
       scheduling  priority  and  scheduling policy of a new thread when it is
       created. However, this routine changes the scheduling policy and param‐
       eters of an existing thread.

RETURN VALUES
       If  an  error  condition occurs, no scheduling policy or parameters are
       changed for the target thread, and  this	 routine  returns  an  integer
       value  indicating the type of error. Possible return values are as fol‐
       lows: Successful completion.  The value specified by policy or param is
       invalid.	 An attempt was made to set the scheduling policy or a parame‐
       ter to an unsupported value.  The caller does not have the  appropriate
       privileges  to set the scheduling policy or parameters of the specified
       thread.	The value specified by thread does not refer  to  an  existing
       thread.

ERRORS
       None

SEE ALSO
       Functions:   pthread_attr_setschedparam(3),   pthread_attr_setschedpol‐
       icy(3), pthread_create(3), pthread_self(3), sched_yield(3)

       Manuals: Guide to DECthreads and Programmer's Guide

						      pthread_setschedparam(3)
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