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From: "Noel L Yap" <yap_noel@jpmorgan.com>
To: mark@npsl.co.uk
cc: Cygwin@sources.redhat.com
Message-ID: <85256921.004C60EA.00@nyc-ntgw-n01.ny.jpmorgan.com>
Date: Wed, 19 Jul 2000 09:54:19 -0400
Subject: RE: Extending cygwin's process table
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"Monotonic" means that a sequence moves in the same direction (or stays the
same).  It doesn't mean that it's sequential.  So, for example, the sequence
"100, 101, 103" is monotonic.

The reason pids are non-monotonic is 'cos they cycle.  Pids aren't unique
through time -- they're reused.

Noel


mark@npsl.co.uk on 2000.07.19 09:17:35

To:   yap_noel@jpmorgan.com, cygwin@sources.redhat.com
cc:
Subject:  RE: Extending cygwin's process table


Isn't pid creation inherently non-monotonic anyway due to multitasking
considerations, i.e.

1.   X w/pid 100 creates Y w/pid 101
2.   A w/pid 2 creates B w/pid 102
3.   Y w/pid 101 creates Z w/pid 103

...so anything that relies on monotonicity just won't be robust.  Just my
2p's worth!

Mark


-----Original Message-----
From: cygwin-owner@sources.redhat.com
[mailto:cygwin-owner@sources.redhat.com]On Behalf Of Noel L Yap
Sent: Wednesday, July 19, 2000 2:05 PM
To: cygwin@sources.redhat.com
Subject: Re: Extending cygwin's process table


cgf@cygnus.com on 2000.07.18 23:43:19
>I'm also toying with trying to more closely tie cygwin pids to windows
>pids.

IMHO, this'd be great.

>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.

I don't think anything should be relying on this behaviour since it's not
always
satisfied (ie when ppid is near the max pid allowed).

>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.

Yeah, I'm not sure if it's possible, but it's worth a shot (unless someone
out
there knows for sure that it's not possible).

Noel


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This communication is for informational purposes only.  It is not intended as
an offer or solicitation for the purchase or sale of any financial instrument
or as an official confirmation of any transaction. All market prices, data
and other information are not warranted as to completeness or accuracy and
are subject to change without notice. Any comments or statements made herein
do not necessarily reflect those of J.P. Morgan & Co. Incorporated, its
subsidiaries and affiliates.


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