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Date: Wed, 19 Jul 2000 09:45:54 -0400
To: cygwin AT sources DOT redhat DOT com
From: Andre Bleau <andre DOT bleau AT courriel DOT polymtl DOT ca>
Subject: Re: Extending cygwin's process table
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>I am planning on revamping cygwin's process table for version 1.1.4.
>I hope to make process creation a little faster and to also allow many
>more cygwin processes.
>
>I'm also toying with trying to more closely tie cygwin pids to windows
>pids.
>
>Is anyone going to be bothered if pid creation is not monotonic?  By
>that I mean, parent pid 1000 may not create child pid 1001.  It may
>create child pid 27.
>
>It may still not be feasible to use cygwin pids as windows pids
>(possibly because I don't believe that pid 1 is special to windows) but
>I thought I'd give this a try anyway unless there is something that I'm
>missing.

In other UNIXes that I know (IRIX, Solaris), there is no garantee of pid 
ordering among parent and child process.  If parent forks several children 
that fork too asynchronously, then I don't see any way of getting monotonic 
ordering.
I think that any program that would rely on monotonic pids would be 
intrinsically unstable and should be fixed instead.

Functions that map PIDs between Windows and Cygwin would be useful; e.g.,
getWindowsPID(CygwinPID) and getCygwinPID(WindowsPID).


André Bleau, ing., analyste
email: bleau at courriel dot polymtl dot ca
(Fight SPAM: encode your email-address)

Département de génie électrique et         Electric Engineering and
de génie informatique                      Computer Engineering department
École Polytechnique de Montréal            Montreal Polytechnic School


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