[MI400] (no subject)

["Steve Richter" <srichter@xxxxxxxxxxxxx>]

0$0e18a218@houston.rr.com>
Subject: Re: [MI400] set spcp to pgm assoc space
Date: Fri, 12 Oct 2001 09:15:06 -0400
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----- Original Message -----
From: "Leif Svalgaard" <leif@leif.org>
> I was wrong about this one. The structure is:
> 6 x00 followed by
> n char(10) fields (one for each handle), where the last 4 chars contain
> a bin(4) DATA-LENGTH (incl handle). when the 80 chars are full,
> all the data is moved down to make room, so the 80 chars is not fixed.
>

Every time a handle located segment of the PGAS is added or changed, the
entire space has to be reorganized. ( if handle 1 is increased from 100 to
200 bytes, all the handle segments after it have to be shifted down by 100
bytes ).

No wonder a "set a ptr to the PGAS" api cannot be provided.  The underlying
data could be shifted at any moment and the appl with the ptr would not know
it.  And allowing direct modification of the PGAS contents via a spcptr
would expose the entire handle structure to corruption.

-Steve Richter