119 lines
3.4 KiB
Groff
119 lines
3.4 KiB
Groff
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.\" $NetBSD: cpuset.3,v 1.3 2008/09/12 13:39:04 rmind Exp $
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.\"
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.\" Copyright (c) 2008 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Mindaugas Rasiukevicius <rmind at NetBSD org>.
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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, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE 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 BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd September 12, 2008
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.Dt CPUSET 3
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.Os
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.Sh NAME
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.Nm cpuset_create ,
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.Nm cpuset_destroy ,
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.Nm cpuset_zero ,
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.Nm cpuset_set ,
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.Nm cpuset_clr ,
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.Nm cpuset_isset ,
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.Nm cpuset_size
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.Nd dynamic CPU sets
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.Sh SYNOPSIS
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.In sched.h
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.Ft cpuset_t
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.Fn cpuset_create "void"
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.Ft void
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.Fn cpuset_destroy "cpuset_t *set"
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.Ft void
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.Fn cpuset_zero "cpuset_t *set"
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.Ft int
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.Fn cpuset_set "cpuid_t cpu" "cpuset_t *set"
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.Ft int
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.Fn cpuset_clr "cpuid_t cpu" "cpuset_t *set"
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.Ft int
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.Fn cpuset_isset "cpuid_t cpu" "const cpuset_t *set"
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.Ft size_t
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.Fn cpuset_size "const cpuset_t *set"
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.Sh DESCRIPTION
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This section describes the functions used to create, set, use and destroy
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the dynamic CPU sets.
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.Pp
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This API can be used with the POSIX threads, see
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.Xr pthread 3
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and
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.Xr affinity 3 .
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.Pp
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The ID of the primary CPU in the system is 0.
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.Sh FUNCTIONS
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.Bl -tag -width compact
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.It Fn cpuset_create
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Allocates and initializes a clean CPU-set.
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Returns the pointer to the CPU-set, or
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.Dv NULL
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on failure.
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.It Fn cpuset_destroy set
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Destroy the CPU-set specified by
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.Fa set .
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.It Fn cpuset_zero set
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Makes the CPU-set specified by
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.Fa set
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clean, that is, memory is initialized to zero bytes, and none of
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the CPUs set.
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.It Fn cpuset_set cpu set
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Sets the CPU specified by
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.Fa cpu
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in
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.Fa set .
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Returns zero on success, and \-1 if
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.Fa cpu
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is invalid.
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.It Fn cpuset_clr cpu set
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Clears the CPU specified by
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.Fa cpu
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in the CPU-set
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.Fa set .
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Returns zero on success, and \-1 if
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.Fa cpu
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is invalid.
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.It Fn cpuset_isset cpu set
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Checks if CPU specified by
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.Fa cpu
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is set in the CPU-set
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.Fa set .
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Returns the positive number if set, zero if not set, and \-1 if
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.Fa cpu
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is invalid.
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.It Fn cpuset_size set
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Returns the size in bytes of CPU-set specified by
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.Fa set .
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.El
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.Sh SEE ALSO
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.Xr affinity 3 ,
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.Xr pset 3 ,
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.Xr sched 3 ,
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.Xr schedctl 8
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.Sh HISTORY
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The dynamic CPU sets appeared in
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.Nx 5.0 .
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