NetBSD/lib/libc/sys/sa_register.2

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.\" $NetBSD: sa_register.2,v 1.2 2004/03/14 10:19:59 snj 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
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.\" 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
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.\" 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
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" ------------------------------------------------------------
.Dd March 14, 2004
.Dt SA_REGISTER 2
.Os
.Sh NAME
.Nm sa_register
.Nd register a scheduler activation upcall handler
.\" ------------------------------------------------------------
.Sh LIBRARY
.Lb libc
.\" ------------------------------------------------------------
.Sh SYNOPSIS
.In sa.h
.Ft int
.Fn sa_register \
"sa_upcall_t new" \
"sa_upcall_t *old" \
"int flags" \
"ssize_t stackinfo_offset"
.\" ------------------------------------------------------------
.Sh DESCRIPTION
.Nm
is used to prepare scheduler activation.
It registers the upcall handler specified by
.Fa new .
If
.Fa old
isn't
.Dv NULL ,
the previous handler will be returned to the location pointed by it.
If
.Dv SA_FLAG_STACKINFO
is specified in
.Fa flags ,
.Fa stackinfo_offset
is used to locate per upcall stack memory areas shared between
userland and kernel.
.Fa stackinfo_offset
is a byte offset from the corresponding upcall stack.
.\" ------------------------------------------------------------
.Sh RETURN VALUES
.Fn sa_register
returns zero on success.
Otherwise, a value of \-1 is returned and
.Va errno
is set to indicate the error.
.\" ------------------------------------------------------------
.Sh SEE ALSO
.Xr pthread 3