Libc-997.1.1.tar.gz

[apple/libc.git] / pthreads / pthread_getschedparam.3

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-.\" Copyright (C) 2000 Jason Evans <jasone@FreeBSD.org>.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice(s), this list of conditions and the following disclaimer as
-.\"    the first lines of this file unmodified other than the possible
-.\"    addition of one or more copyright notices.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice(s), this list of conditions and the following disclaimer in
-.\"    the documentation and/or other materials provided with the
-.\"    distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
-.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
-.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
-.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
-.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
-.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-.\"
-.\" $FreeBSD: src/lib/libc_r/man/pthread_schedparam.3,v 1.2.2.4 2001/08/17 15:42:52 ru Exp $
-.Dd May 1, 2000
-.Dt PTHREAD_SCHEDPARAM 3
-.Os
-.Sh NAME
-.Nm pthread_getschedparam ,
-.Nm pthread_setschedparam
-.Nd thread scheduling parameter manipulation
-.Sh SYNOPSIS
-.Fd #include <pthread.h>
-.Ft int
-.Fo pthread_getschedparam
-.Fa "pthread_t thread"
-.Fa "int *restrict policy"
-.Fa "struct sched_param *restrict param"
-.Fc
-.Ft int
-.Fo pthread_setschedparam
-.Fa "pthread_t thread"
-.Fa "int policy"
-.Fa "const struct sched_param *param"
-.Fc
-.Sh DESCRIPTION
-The
-.Fn pthread_getschedparam
-and
-.Fn pthread_setschedparam
-functions get and set 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 at least
-.Dv PTHREAD_MIN_PRIORITY
-and no more than
-.Dv PTHREAD_MAX_PRIORITY .
-.Sh RETURN VALUES
-If successful, these functions return 0.
-Otherwise, an error number is returned to indicate the error.
-.Sh ERRORS
-.Fn pthread_getschedparam
-will fail if:
-.Bl -tag -width Er
-.It Bq Er ESRCH
-Non-existent thread
-.Va thread .
-.El
-.Pp
-.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
-.Sh STANDARDS
-.Fn pthread_setschedparam
-and
-.Fn pthread_getschedparam
-conform to
-.St -susv2