minix/lib/libc/sys/_lwp_getprivate.2
Lionel Sambuc 84d9c625bf Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC)
- Fix for possible unset uid/gid in toproto
 - Fix for default mtree style
 - Update libelf
 - Importing libexecinfo
 - Resynchronize GCC, mpc, gmp, mpfr
 - build.sh: Replace params with show-params.
     This has been done as the make target has been renamed in the same
     way, while a new target named params has been added. This new
     target generates a file containing all the parameters, instead of
     printing it on the console.
 - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
     get getservbyport() out of the inner loop

Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
2014-07-28 17:05:06 +02:00

90 lines
2.8 KiB
Groff

.\" $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
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" 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 .