90 lines
2.8 KiB
Groff
90 lines
2.8 KiB
Groff
.\" $NetBSD: _lwp_getprivate.2,v 1.6 2013/10/05 09:18:56 njoly Exp $
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.\"
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.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jason R. Thorpe of Wasabi Systems, Inc.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd September 7, 2013
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.Dt _LWP_GETPRIVATE 2
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.Os
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.Sh NAME
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.Nm _lwp_getprivate ,
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.Nm _lwp_setprivate
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.Nd get and set light-weight process private data
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In lwp.h
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.Ft void *
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.Fn _lwp_getprivate void
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.Ft void
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.Fn _lwp_setprivate "void *ptr"
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.Sh DESCRIPTION
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.Fn _lwp_setprivate
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stores the pointer to private data
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.Fa ptr
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in a location private to the LWP.
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.Pp
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.Fn _lwp_getprivate
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returns the pointer to private data for the LWP.
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.Pp
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Some platforms provide alternative ways quicker than
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.Fn _lwp_getprivate
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to use the pointer.
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.Bl -tag -width amd64
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.It alpha
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The pointer can be retrieved by call_pal PAL_rdunique.
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.It amd64
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The base address of
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.Dv %fs
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register is set to the pointer so that the private data can be
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accessed using the selector.
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.It i386
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The base address of
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.Dv %gs
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register is set to the pointer so that the private data can be
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accessed using the selector.
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.It sparc
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.Dv %g7
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register is set to the pointer.
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.El
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.Sh ERRORS
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The
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.Fn _lwp_getprivate
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and
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.Fn _lwp_setprivate
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functions are always successful, and no return value is reserved to indicate
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an error.
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.Sh SEE ALSO
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.Xr _lwp_makecontext 3
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.Sh HISTORY
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The
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.Fn _lwp_getprivate
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and
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.Fn _lwp_setprivate
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system calls first appeared in
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.Nx 2.0 .
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