Mostly, I don't see Shmuel's post, but this time he has commented on one of mine.
RESERVE is not a special form of ENQ. It was then and is now hardware implemented. John Gilmore, Ashland MA 01721 - USA On 6/22/12, Shmuel Metz (Seymour J.) <[email protected]> wrote: > 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) > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
