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+.\"	$NetBSD: _lwp_getprivate.2,v 1.6 2013/10/05 09:18:56 njoly Exp $
+.\"
+.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Jason R. Thorpe of Wasabi Systems, Inc.
+.\"
+.\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 September 7, 2013
+.Dt _LWP_GETPRIVATE 2
+.Os
+.Sh NAME
+.Nm _lwp_getprivate ,
+.Nm _lwp_setprivate
+.Nd get and set light-weight process private data
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In lwp.h
+.Ft void *
+.Fn _lwp_getprivate void
+.Ft void
+.Fn _lwp_setprivate "void *ptr"
+.Sh DESCRIPTION
+.Fn _lwp_setprivate
+stores the pointer to private data
+.Fa ptr
+in a location private to the LWP.
+.Pp
+.Fn _lwp_getprivate
+returns the pointer to private data for the LWP.
+.Pp
+Some platforms provide alternative ways quicker than
+.Fn _lwp_getprivate
+to use the pointer.
+.Bl -tag -width amd64
+.It alpha
+The pointer can be retrieved by call_pal PAL_rdunique.
+.It amd64
+The base address of
+.Dv %fs
+register is set to the pointer so that the private data can be
+accessed using the selector.
+.It i386
+The base address of
+.Dv %gs
+register is set to the pointer so that the private data can be
+accessed using the selector.
+.It sparc
+.Dv %g7
+register is set to the pointer.
+.El
+.Sh ERRORS
+The
+.Fn _lwp_getprivate
+and
+.Fn _lwp_setprivate
+functions are always successful, and no return value is reserved to indicate
+an error.
+.Sh SEE ALSO
+.Xr _lwp_makecontext 3
+.Sh HISTORY
+The
+.Fn _lwp_getprivate
+and
+.Fn _lwp_setprivate
+system calls first appeared in
+.Nx 2.0 .