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Revision 1.4, Fri Mar 1 18:39:52 2013 UTC (11 years ago) by joerg
Branch: MAIN
CVS Tags: yamt-pagecache-base9, tls-maxphys-base, tls-earlyentropy-base, tls-earlyentropy, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-2-RELEASE, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, agc-symver-base, agc-symver
Changes since 1.3: +2 -4 lines

All current semaphores support process sharing.

.\" $NetBSD: sem.4,v 1.4 2013/03/01 18:39:52 joerg Exp $
.\"
.\" Copyright (c) 2002 Tim J. Robbins
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\" 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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" From: FreeBSD: src/share/man/man4/sem.4,v 1.2 2003/06/02 11:19:23 ru
.\"
.Dd March 1, 2013
.Dt SEM 4
.Os
.Sh NAME
.Nm sem
.Nd POSIX semaphores
.Sh SYNOPSIS
To link into the kernel:
.Bd -ragged -offset indent
.Cd "options P1003_1B_SEMAPHORE"
.Ed
.Sh DESCRIPTION
The
.Nm
facility provides system calls used by the standard C library
.Pq libc
to implement
.Tn POSIX
semaphores.
.Sh SEE ALSO
.Xr config 1 ,
.Xr sem_destroy 3 ,
.Xr sem_getvalue 3 ,
.Xr sem_init 3 ,
.Xr sem_open 3 ,
.Xr sem_post 3 ,
.Xr sem_wait 3 ,
.Xr options 4
.Sh HISTORY
The
.Nm
facility appeared as a kernel option in
.Nx 2.0 .