2.11BSD/src/man/man2/lock.2

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.\" Copyright (c) 1983 Regents of the University of California.
.\" All rights reserved.  The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
.\"	@(#)lock.2	2.3 (Berkeley) 1/22/87
.\"
.TH LOCK 2 "January 22, 1987"
.UC 2
.SH NAME
lock \- lock a process in primary memory (2BSD)
.SH SYNOPSIS
.nf
.ft B
lock(flag)
int flag
.fi
.ft R
.SH DESCRIPTION
If the
.I flag
argument is non-zero,
the process executing this call
will not be swapped unless it is required to grow.
If the argument is zero,
the process is
.RI un lock ed.
This call may only be executed by
the super-user.
.SH ERRORS
.TP 15
[EPERM]
The caller is not the super-user.
.SH BUGS
.IR Lock ed
processes interfere with the compaction of primary memory
and can cause deadlock.
This system call is not considered
a permanent part of the system.
.PP
.I Lock
is unique to the PDP-11 and 2BSD; its use is discouraged.