Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!pilchuck!ssc!mcgp1!jgo
From: jgo@mcgp1.UUCP (John Opalko, N7KBT)
Newsgroups: comp.unix.questions
Subject: Re: plock()
Keywords: System V, 3B2, C
Message-ID: <4677@mcgp1.UUCP>
Date: 10 Dec 90 21:51:40 GMT
References: <Dec.9.18.47.25.1990.17008@remus.rutgers.edu>
Reply-To: jgo@mcgp1.UUCP (John Opalko)
Distribution: usa
Organization: McCaw Cellular Communications, Inc., Seattle
Lines: 27

The plock() system call doesn't give your process a high priority, but it
does prevent it from being swapped out.

    SYNOPSIS
	#include <sys/lock.h>

	int plock (op)
	int op;


    Op specifies the following:

	PROCLOCK - lock text and data segments into memory (process lock)

	TXTLOCK  - lock text segment into memory (text lock)

	DATLOCK  - lock data segment into memory (data lock)

	UNLOCK   - remove locks


As you might suspect, you have to be root to use this hummer and, as usual,
it returns 0 if successful and -1 if not, with the obligatory setting
of errno.


Hope this helps.