.\" $OpenBSD: pthread_schedparam.3,v 1.6 2015/11/10 23:48:18 jmc Exp $
.\" Copyright (C) 2000 Jason Evans <jasone@freebsd.org>.
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.\" $FreeBSD: src/lib/libc_r/man/pthread_schedparam.3,v 1.4 2001/07/15 07:53:27 dd Exp $
.Dd $Mdocdate: November 10 2015 $
.Dt PTHREAD_SETSCHEDPARAM 3
.Os
.Sh NAME
.Nm pthread_setschedparam ,
.Nm pthread_getschedparam
.Nd thread scheduling parameter manipulation
.Sh SYNOPSIS
.In pthread.h
.Ft int
.Fn pthread_setschedparam "pthread_t thread" "int policy" "const struct sched_param *param"
.Ft int
.Fn pthread_getschedparam "pthread_t thread" "int *policy" "struct sched_param *param"
.Sh DESCRIPTION
The
.Fn pthread_setschedparam
and
.Fn pthread_getschedparam
functions set and get the scheduling parameters of individual threads.
The scheduling policy for a thread can either be
.Dv SCHED_FIFO
(first in, first out) or
.Dv SCHED_RR
(round-robin).
The thread priority (accessed via
.Va param->sched_priority )
must be within the range returned by the
.Fn sched_get_priority_min
and
.Fn sched_get_priority_max
functions.
.Sh RETURN VALUES
If successful, these functions return 0.
Otherwise, an error number is returned to indicate the error.
.Sh ERRORS
.Fn pthread_setschedparam
will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
Invalid value for
.Va policy .
.It Bq Er ENOTSUP
Invalid value for scheduling parameters.
.It Bq Er ESRCH
Non-existent thread
.Va thread .
.El
.Pp
.Fn pthread_getschedparam
will fail if:
.Bl -tag -width Er
.It Bq Er ESRCH
Non-existent thread
.Va thread .
.El
.Sh SEE ALSO
.Xr sched_get_priority_max 3
.Sh STANDARDS
.Fn pthread_setschedparam
and
.Fn pthread_getschedparam
conform to
.St -susv2