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From: ram@nucsrl.UUCP
Newsgroups: comp.unix.questions
Subject: Re: Suspending processes
Message-ID: <3680004@nucsrl.UUCP>
Date: Sat, 17-Jan-87 03:32:33 EST
Article-I.D.: nucsrl.3680004
Posted: Sat Jan 17 03:32:33 1987
Date-Received: Mon, 19-Jan-87 01:55:39 EST
References: <836@A60.UUCP>
Organization: Northwestern Univ., Evanston IL
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/ nucsrl:comp.unix.questions / lee@A60.UUCP (G. Lee) /  9:13 am  Jan  9, 1987 /

>>  Does UNIX provide a standard way to suspend a processes ( stop it
>>from getting CPU time )?


     I know that two MS(!) theses that were written on this topic at U. of Ill
at Champaign, one each on SYSV and BSD.  The suspend and renew commands
were called "spr" and "rpr" were implemented at the user level.
If you are that desparate, and don't want to bother writing one on your own,
you may obtain those tech reports and type in the source code included with
the report (with the authors permission, of course).

     Having raised that question, it may be wise to note that such
a feature may well become necessary if you have 
UNIX in a multiple-processor box. The user can suspend
a process, migrate it elsewhere and start up the process in another
process.  There are other applications related to fault tolerance,
which I would rather not talk about right now.


                                        Renu Raman
                                   ...ihnp4!nucsrl!ram
                                   Northwestern University Comp. Sci. Lab