b6413b6db8
This basically adds makes use of the C99 restrict keyword, and also adds some 'const's to four threading functions: pthread_mutexattr_gettype(), pthread_mutexattr_getprioceiling(), pthread_mutexattr_getprotocol(), and pthread_mutex_getprioceiling. The changes are in accordance to POSIX/SUSv4-2018. Hinted by: DragonFlyBSD Relnotes: yes MFC after: 1 month Differential Revision: D16722
101 lines
3.0 KiB
Groff
101 lines
3.0 KiB
Groff
.\" Copyright (C) 2000 Jason Evans <jasone@FreeBSD.org>.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice(s), this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified other than the possible
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.\" addition of one or more copyright notices.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice(s), this list of conditions and the following disclaimer in
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.\" the documentation and/or other materials provided with the
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.\" distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
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.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 17, 2018
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.Dt PTHREAD_SCHEDPARAM 3
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.Os
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.Sh NAME
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.Nm pthread_setschedparam ,
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.Nm pthread_getschedparam
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.Nd thread scheduling parameter manipulation
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.Sh LIBRARY
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.Lb libpthread
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.Sh SYNOPSIS
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.In pthread.h
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.Ft int
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.Fn pthread_setschedparam "pthread_t thread" "int policy" "const struct sched_param *param"
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.Ft int
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.Fn pthread_getschedparam "pthread_t thread" "int *restrict policy" "struct sched_param *restrict param"
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.Sh DESCRIPTION
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The
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.Fn pthread_setschedparam
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and
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.Fn pthread_getschedparam
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functions set and get the scheduling parameters of individual threads.
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The scheduling policy for a thread can either be
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.Dv SCHED_FIFO
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(first in, first out),
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.Dv SCHED_RR
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(round-robin), or
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.Dv SCHED_OTHER
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(timesharing).
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Valid thread priorities (accessed via
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.Va param->sched_priority )
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must be within the range returned by the
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.Xr sched_get_priority_min 2
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and
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.Xr sched_get_priority_max 2
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system calls.
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.Sh RETURN VALUES
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If successful, these functions return 0.
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Otherwise, an error number is returned to indicate the error.
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.Sh ERRORS
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The
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.Fn pthread_setschedparam
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function will fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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Invalid value for
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.Fa policy .
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.It Bq Er ENOTSUP
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Invalid value for scheduling parameters.
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.It Bq Er ESRCH
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Non-existent thread
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.Fa thread .
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.El
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.Pp
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The
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.Fn pthread_getschedparam
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function will fail if:
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.Bl -tag -width Er
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.It Bq Er ESRCH
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Non-existent thread
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.Fa thread .
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.El
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.Sh SEE ALSO
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.Xr sched_get_priority_max 2 ,
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.Xr sched_get_priority_min 2
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.Sh STANDARDS
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The
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.Fn pthread_setschedparam
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and
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.Fn pthread_getschedparam
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functions conform to
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.St -susv2 .
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