.\"	$NetBSD: cpuset.3,v 1.6 2011/11/02 20:25:20 wiz Exp $
.\"
.\" Copyright (c) 2008 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Mindaugas Rasiukevicius <rmind at NetBSD org>.
.\"
.\" 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, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
.\" ``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 FOUNDATION OR CONTRIBUTORS
.\" 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.
.\"
.Dd November 2, 2011
.Dt CPUSET 3
.Os
.Sh NAME
.Nm cpuset_create ,
.Nm cpuset_destroy ,
.Nm cpuset_zero ,
.Nm cpuset_set ,
.Nm cpuset_clr ,
.Nm cpuset_isset ,
.Nm cpuset_size
.Nd dynamic CPU sets
.Sh SYNOPSIS
.In sched.h
.Ft cpuset_t *
.Fn cpuset_create "void"
.Ft void
.Fn cpuset_destroy "cpuset_t *set"
.Ft void
.Fn cpuset_zero "cpuset_t *set"
.Ft int
.Fn cpuset_set "cpuid_t cpu" "cpuset_t *set"
.Ft int
.Fn cpuset_clr "cpuid_t cpu" "cpuset_t *set"
.Ft int
.Fn cpuset_isset "cpuid_t cpu" "const cpuset_t *set"
.Ft size_t
.Fn cpuset_size "const cpuset_t *set"
.Sh DESCRIPTION
This section describes the functions used to create, set, use and destroy
the dynamic CPU sets.
.Pp
This API can be used with the POSIX threads, see
.Xr pthread 3
and
.Xr affinity 3 .
.Pp
The ID of the primary CPU in the system is 0.
.Sh FUNCTIONS
.Bl -tag -width compact
.It Fn cpuset_create
Allocates and initializes a clean CPU-set.
Returns the pointer to the CPU-set, or
.Dv NULL
on failure.
.It Fn cpuset_destroy set
Destroy the CPU-set specified by
.Fa set .
.It Fn cpuset_zero set
Makes the CPU-set specified by
.Fa set
clean, that is, memory is initialized to zero bytes, and none of
the CPUs set.
.It Fn cpuset_set cpu set
Sets the CPU specified by
.Fa cpu
in
.Fa set .
Returns zero on success, and \-1 if
.Fa cpu
is invalid.
.It Fn cpuset_clr cpu set
Clears the CPU specified by
.Fa cpu
in the CPU-set
.Fa set .
Returns zero on success, and \-1 if
.Fa cpu
is invalid.
.It Fn cpuset_isset cpu set
Checks if CPU specified by
.Fa cpu
is set in the CPU-set
.Fa set .
Returns the positive number if set, zero if not set, and \-1 if
.Fa cpu
is invalid.
.It Fn cpuset_size set
Returns the size in bytes of CPU-set specified by
.Fa set .
.El
.Sh SEE ALSO
.Xr affinity 3 ,
.Xr pset 3 ,
.Xr sched 3 ,
.Xr schedctl 8 ,
.Xr kcpuset 9
.Sh HISTORY
The dynamic CPU sets appeared in
.Nx 5.0 .