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.\" 30.Dd October 16, 2006 31.Dt PTHREAD_SCHEDPARAM 3 32.Os 33.Sh NAME 34.Nm pthread_setschedparam , 35.Nm pthread_getschedparam 36.Nd thread scheduling parameter manipulation 37.Sh LIBRARY 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), 55.Dv SCHED_RR 56(round-robin), or 57.Dv SCHED_OTHER 58(timesharing). 59Valid thread priorities (accessed via 60.Va param->sched_priority ) 61must be within the range returned by the 62.Xr sched_get_priority_min 2 63and 64.Xr sched_get_priority_max 2 65system calls. 66.Sh RETURN VALUES 67If successful, these functions return 0. 68Otherwise, an error number is returned to indicate the error. 69.Sh ERRORS 70The 71.Fn pthread_setschedparam 72function will fail if: 73.Bl -tag -width Er 74.It Bq Er EINVAL 75Invalid value for 76.Fa policy . 77.It Bq Er ENOTSUP 78Invalid value for scheduling parameters. 79.It Bq Er ESRCH 80Non-existent thread 81.Fa thread . 82.El 83.Pp 84The 85.Fn pthread_getschedparam 86function will fail if: 87.Bl -tag -width Er 88.It Bq Er ESRCH 89Non-existent thread 90.Fa thread . 91.El 92.Sh SEE ALSO 93.Xr sched_get_priority_max 2 , 94.Xr sched_get_priority_min 2 95.Sh STANDARDS 96The 97.Fn pthread_setschedparam 98and 99.Fn pthread_getschedparam 100functions conform to 101.St -susv2 . 102