In
<CAE1XxDFG9DZMu=+npbg4tc4pgc2wcydx2gnsrt8vnpke_qu...@mail.gmail.com>,
on 06/20/2012
at 02:36 PM, John Gilmore <[email protected]> said:
>Anciently, under OS/PCP and OS/MFT, the Linkage Editor issued a
>RESERVE for the DASD volume on which the target PDS for its output
>load module resided in much the same circumstances. (It could not
>know in advance how much space it would need.)
The ENQ[1] on SYSIEWL had nothing to do with the amount of space; it
was there to protect the integrity of SYSLMOD.
Why was the ENQ a RESERVE? Because there was no GRS. Since a PDS
couldn't span volumes, the RESERVE protected the PDS from concurrent
access both from the same system and from other systems.
[1] RESERVE is just a special form of ENQ.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
Atid/2 <http://patriot.net/~shmuel>
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)
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