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From: davel@hpisoa1.UUCP
Newsgroups: comp.unix.questions
Subject: Re: Suspending processes (really, about how to answer questions)
Message-ID: <2040004@hpisoa1.HP.COM>
Date: Wed, 21-Jan-87 21:02:08 EST
Article-I.D.: hpisoa1.2040004
Posted: Wed Jan 21 21:02:08 1987
Date-Received: Sun, 25-Jan-87 14:48:57 EST
References: <836@A60.UUCP>
Lines: 16

Although the System V shell layers (shl) switch character does provide
a feature similar to BSD job control, it differs in (at least) one important
way:  shell layers has no way to stop a job from executing (consuming CPU
time) until it requests input from the terminal layer and blocks.  When
you type your switch character, it merely adjusts what the current "layer"
is; it does not alter the state of processes running in that layer.

BSD job control actually immediately suspends the execution of the process.
If what you want is to control CPU consumption (as opposed to multiplexing
your terminal among different jobs) then BSD-style job control works and
System V shell layers is ineffective.

    Dave Lennert                ucbvax!hpda!davel               [UUCP]
    Hewlett-Packard - 47UX      ihnp4!hplabs!hpda!davel         [UUCP]
    19447 Pruneridge Ave.       hpda!davel@Berkeley.edu         [ARPA]
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