1.\" Copyright (C) 2000 Jason Evans <jasone@FreeBSD.org>. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice(s), this list of conditions and the following disclaimer as 9.\" the first lines of this file unmodified other than the possible 10.\" addition of one or more copyright notices. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice(s), this list of conditions and the following disclaimer in 13.\" the documentation and/or other materials provided with the 14.\" distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 17.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE 20.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 23.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 25.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 26.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27.\" 28.\" $FreeBSD$ 29.Dd May 1, 2000 30.Dt PTHREAD_SCHEDPARAM 3 31.Os 32.Sh NAME 33.Nm pthread_setschedparam , 34.Nm pthread_getschedparam 35.Nd thread scheduling parameter manipulation 36.Sh LIBRARY 37.Lb libc_r 38.Lb libpthread 39.Lb libthr 40.Sh SYNOPSIS 41.In pthread.h 42.Ft int 43.Fn pthread_setschedparam "pthread_t thread" "int policy" "const struct sched_param *param" 44.Ft int 45.Fn pthread_getschedparam "pthread_t thread" "int *policy" "struct sched_param *param" 46.Sh DESCRIPTION 47The 48.Fn pthread_setschedparam 49and 50.Fn pthread_getschedparam 51functions set and get the scheduling parameters of individual threads. 52The scheduling policy for a thread can either be 53.Dv SCHED_FIFO 54(first in, first out) or 55.Dv SCHED_RR 56(round-robin). 57The thread priority (accessed via 58.Va param->sched_priority ) 59must be at least 60.Dv PTHREAD_MIN_PRIORITY 61and no more than 62.Dv PTHREAD_MAX_PRIORITY . 63.Sh RETURN VALUES 64If successful, these functions return 0. 65Otherwise, an error number is returned to indicate the error. 66.Sh ERRORS 67The 68.Fn pthread_setschedparam 69function will fail if: 70.Bl -tag -width Er 71.It Bq Er EINVAL 72Invalid value for 73.Va policy . 74.It Bq Er ENOTSUP 75Invalid value for scheduling parameters. 76.It Bq Er ESRCH 77Non-existent thread 78.Va thread . 79.El 80.Pp 81The 82.Fn pthread_getschedparam 83function will fail if: 84.Bl -tag -width Er 85.It Bq Er ESRCH 86Non-existent thread 87.Va thread . 88.El 89.Sh STANDARDS 90The 91.Fn pthread_setschedparam 92and 93.Fn pthread_getschedparam 94functions conform to 95.St -susv2 96