1.\" $NetBSD: sa_setconcurrency.2,v 1.4 2005/09/05 21:57:35 yamt Exp $ 2.\" 3.\" Copyright (c)2004 YAMAMOTO Takashi, 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.\" ------------------------------------------------------------ 28.Dd September 6, 2005 29.Dt SA_CONCURRENCY 2 30.Os 31.Sh NAME 32.Nm sa_setconcurrency 33.Nd increase the number of virtual processors 34.\" ------------------------------------------------------------ 35.Sh LIBRARY 36.Lb libc 37.\" ------------------------------------------------------------ 38.Sh SYNOPSIS 39.In sa.h 40.Ft int 41.Fn sa_setconcurrency \ 42 "int concurrency" 43.\" ------------------------------------------------------------ 44.Sh DESCRIPTION 45.Fn sa_setconcurrency 46is used to increase the number of scheduler activation virtual processors 47used by the process. 48.Fn sa_setconcurrency 49increases the number of virtual processors, i.e., execution concurrency, 50up to 51.Fa concurrency . 52However, 53.Fn sa_setconcurrency 54won't try to allocate more virtual processors than there are physical 55processors on the system. 56.Pp 57Scheduler activation should be enabled by 58.Fn sa_enable 59beforehand. 60.\" ------------------------------------------------------------ 61.Sh RETURN VALUES 62On success, 63.Fn sa_setconcurrency 64returns the number of newly added virtual processors. 65Otherwise, a value of \-1 is returned and 66.Va errno 67is set to indicate the error. 68.\" ------------------------------------------------------------ 69.Sh SEE ALSO 70.Xr pthread 3 71