Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!auspex!guy
From: guy@auspex.auspex.com (Guy Harris)
Newsgroups: comp.unix.wizards
Subject: Re: /dev/zero and MAP_ANON (was: Re: GC triggering ...)
Message-ID: <3741@auspex.auspex.com>
Date: 24 Jul 90 18:52:58 GMT
References: <58338@bbn.BBN.COM> <3713@auspex.auspex.com> <58352@bbn.BBN.COM>
Organization: Auspex Systems, Santa Clara
Lines: 11

>Here is a question for you about mmap of /dev/zero.  Is this a useful feature
>for unrelated processes to share memory?

Not as far as I know.  There's nothing on which they can rendezvous....

>Are there any other ways to share zero-filled memory without consuming
>disk space (as with regular mapped files) for unrelated processes in
>these operating systems?

Yes, you can use the shared memory mechanism provided by the S5 IPC
mechanisms ("shmat()" and all that).