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.Sh SYNOPSIS 39.In pthread.h 40.Ft int 41.Fn pthread_setschedparam "pthread_t thread" "int policy" "const struct sched_param *param" 42.Ft int 43.Fn pthread_getschedparam "pthread_t thread" "int *policy" "struct sched_param *param" 44.Sh DESCRIPTION 45The 46.Fn pthread_setschedparam 47and 48.Fn pthread_getschedparam 49functions set and get the scheduling parameters of individual threads. 50The scheduling policy for a thread can either be 51.Dv SCHED_FIFO 52(first in, first out) or 53.Dv SCHED_RR 54(round-robin). 55The thread priority (accessed via 56.Va param->sched_priority ) 57must be at least 58.Dv PTHREAD_MIN_PRIORITY 59and no more than 60.Dv PTHREAD_MAX_PRIORITY . 61.Sh RETURN VALUES 62If successful, these functions return 0. 63Otherwise, an error number is returned to indicate the error. 64.Sh ERRORS 65The 66.Fn pthread_setschedparam 67function will fail if: 68.Bl -tag -width Er 69.It Bq Er EINVAL 70Invalid value for 71.Va policy . 72.It Bq Er ENOTSUP 73Invalid value for scheduling parameters. 74.It Bq Er ESRCH 75Non-existent thread 76.Va thread . 77.El 78.Pp 79The 80.Fn pthread_getschedparam 81function will fail if: 82.Bl -tag -width Er 83.It Bq Er ESRCH 84Non-existent thread 85.Va thread . 86.El 87.Sh STANDARDS 88The 89.Fn pthread_setschedparam 90and 91.Fn pthread_getschedparam 92functions conform to 93.St -susv2 94