71 lines
2.7 KiB
Groff
71 lines
2.7 KiB
Groff
.\" $NetBSD: sa_setconcurrency.2,v 1.3 2004/03/14 23:05:09 yamt Exp $
|
|
.\"
|
|
.\" Copyright (c)2004 YAMAMOTO Takashi,
|
|
.\" 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, 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 AUTHOR 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 AUTHOR 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 March 14, 2004
|
|
.Dt SA_CONCURRENCY 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm sa_setconcurrency
|
|
.Nd increase the number of virtual processors
|
|
.\" ------------------------------------------------------------
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.\" ------------------------------------------------------------
|
|
.Sh SYNOPSIS
|
|
.In sa.h
|
|
.Ft int
|
|
.Fn sa_setconcurrency \
|
|
"int concurrency"
|
|
.\" ------------------------------------------------------------
|
|
.Sh DESCRIPTION
|
|
.Fn sa_setconcurrency
|
|
is used to increase the number of scheduler activation virtual processors
|
|
used by the process.
|
|
.Fn sa_setconcurrency
|
|
increases the number of virtual processors, i.e., execution concurrency,
|
|
up to
|
|
.Fa concurrency .
|
|
However,
|
|
.Fn sa_setconcurrency
|
|
won't try to allocate more virtual processors than there are physical
|
|
processors on the system.
|
|
.Pp
|
|
An upcall handler should be registered by
|
|
.Fn sa_register
|
|
beforehand.
|
|
.\" ------------------------------------------------------------
|
|
.Sh RETURN VALUES
|
|
On success,
|
|
.Fn sa_setconcurrency
|
|
returns the number of newly added virtual processors.
|
|
Otherwise, a value of \-1 is returned and
|
|
.Va errno
|
|
is set to indicate the error.
|
|
.\" ------------------------------------------------------------
|
|
.Sh SEE ALSO
|
|
.Xr pthread 3
|