Path: utzoo!attcan!uunet!cs.utexas.edu!ut-emx!ccwf.cc.utexas.edu!alext
From: alext@ccwf.cc.utexas.edu (Alex Tomlinson)
Newsgroups: comp.sys.isis
Subject: V2.1 Problem Regarding group membership changes
Message-ID: <ALEXT.91Feb27191225@doc.cc.utexas.edu>
Date: 28 Feb 91 01:12:25 GMT
Sender: news@ut-emx.uucp
Distribution: comp
Organization: The University of Texas at Austin
Lines: 22


We have a problem in ISISV2.1 regarding killing the rank zero member
of a process group.  We set up a toy program to notify each member
of the process group when the group membership changes (PG_MONITOR).
Everything works as expected for the following cases:

	- any member of the group leaves via pg_leave
	- any member except the rank zero is terminated via a UNIX "kill"

When the rank zero member of the group is killed, ISIS seems not to notice.
We base this on the following:

	- no members are notified
	- .../run_isis/cmd  reports that the process is still part of the group
	- the process doesn't exist as far as UNIX's "ps" command is concerned

Is this a bug in ISISV2.1?
Please email or post any ideas.

Thanks,
Alex Tomlinson
Greg Hoagland