Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!cs.utexas.edu!ut-emx!walt.cc.utexas.edu!jonabbey
From: jonabbey@walt.cc.utexas.edu (Jonathan Abbey)
Newsgroups: comp.sys.amiga
Subject: Re: Suggestions for a kill command
Summary: Well, why not?
Keywords: kill
Message-ID: <19591@ut-emx.UUCP>
Date: 14 Oct 89 19:39:44 GMT
References: <1661@nigel.udel.EDU>
Sender: news@ut-emx.UUCP
Reply-To: jonabbey@walt.cc.utexas.edu (Jonathan Abbey)
Organization: The University of Texas at Austin, Austin, Texas
Lines: 34

In article <1661@nigel.udel.EDU> okay@tafs.mitre.org (Okay S J) writes:


>Out of curiosity, how difficult would this be to do?--You'd just have to 
>get the PID of the offending process and then force a hangup or vacate (no 
>flames please, I don't the amiga lib calls memorized) right? (assuming 
>worst case where you there's no way out but to just kill it and forget 
>finishing I/O).
>---Steve

Actually, I don't think it would be all that difficult.. all it would
take (Quick!  Check the RKM Jon:... got it!) would be an expansion to the
Task structure similar to tc_ExceptCode and tc_TrapCode, perhaps tc_ExitCode
with an accompanying tc_ExitData (containing an intuition RememberKey, for
instance), that points to a routine to be executed upon exit from a task,
either through a kill signal, normal exit from main code, or an unsalvageable
task crash.  This could be implemented similar to the fattenlayerinfo() hack
that was used in 1.1.  i.e., a simple task structure would be send to AddTask,
and the main code would call SetExitCode() or some such.  Otherwise, one
could define a task superstructure, and call a modified AddTask to add
the task to the system.  This might have some compatibility problems with
the process structure though.

Of course, the exit code would not be called if SetExitCode() was not called.
If it the exit routine were called, the main task code would be halted.  This
system would require that the main code keep the tc_ExitData up to date at
all times..

Actually, I think ARP implements something similar, but I've not had
opportunity to work with the ARP library yet.  (??)


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