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.\" $NetBSD: sa_setconcurrency.2,v 1.4 2005/09/05 21:57:35 yamt Exp $
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.\"
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.\" Copyright (c)2004 YAMAMOTO Takashi,
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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, 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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" ------------------------------------------------------------
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2005-09-06 01:57:35 +04:00
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.Dd September 6, 2005
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2004-03-14 12:18:45 +03:00
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.Dt SA_CONCURRENCY 2
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.Os
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.Sh NAME
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.Nm sa_setconcurrency
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.Nd increase the number of virtual processors
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.\" ------------------------------------------------------------
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.Sh LIBRARY
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.Lb libc
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.\" ------------------------------------------------------------
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.Sh SYNOPSIS
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.In sa.h
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.Ft int
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.Fn sa_setconcurrency \
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"int concurrency"
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.\" ------------------------------------------------------------
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.Sh DESCRIPTION
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.Fn sa_setconcurrency
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is used to increase the number of scheduler activation virtual processors
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used by the process.
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.Fn sa_setconcurrency
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increases the number of virtual processors, i.e., execution concurrency,
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up to
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.Fa concurrency .
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However,
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.Fn sa_setconcurrency
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won't try to allocate more virtual processors than there are physical
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processors on the system.
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.Pp
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Scheduler activation should be enabled by
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.Fn sa_enable
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beforehand.
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.\" ------------------------------------------------------------
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.Sh RETURN VALUES
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On success,
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.Fn sa_setconcurrency
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returns the number of newly added virtual processors.
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Otherwise, a value of \-1 is returned and
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.Va errno
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is set to indicate the error.
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.\" ------------------------------------------------------------
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.Sh SEE ALSO
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.Xr pthread 3
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