1.\" $NetBSD: sa_register.2,v 1.2 2004/03/14 10:19:59 snj 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 March 14, 2004 29.Dt SA_REGISTER 2 30.Os 31.Sh NAME 32.Nm sa_register 33.Nd register a scheduler activation upcall handler 34.\" ------------------------------------------------------------ 35.Sh LIBRARY 36.Lb libc 37.\" ------------------------------------------------------------ 38.Sh SYNOPSIS 39.In sa.h 40.Ft int 41.Fn sa_register \ 42 "sa_upcall_t new" \ 43 "sa_upcall_t *old" \ 44 "int flags" \ 45 "ssize_t stackinfo_offset" 46.\" ------------------------------------------------------------ 47.Sh DESCRIPTION 48.Nm 49is used to prepare scheduler activation. 50It registers the upcall handler specified by 51.Fa new . 52If 53.Fa old 54isn't 55.Dv NULL , 56the previous handler will be returned to the location pointed by it. 57If 58.Dv SA_FLAG_STACKINFO 59is specified in 60.Fa flags , 61.Fa stackinfo_offset 62is used to locate per upcall stack memory areas shared between 63userland and kernel. 64.Fa stackinfo_offset 65is a byte offset from the corresponding upcall stack. 66.\" ------------------------------------------------------------ 67.Sh RETURN VALUES 68.Fn sa_register 69returns zero on success. 70Otherwise, a value of \-1 is returned and 71.Va errno 72is set to indicate the error. 73.\" ------------------------------------------------------------ 74.Sh SEE ALSO 75.Xr pthread 3 76