[HECnet] Web-server under RSX-11M-PLUS

[Paul_Koning at Dell.com]

Async I/O involves a couple of new system calls (new EMT codes) -- .reada, .writa, .astx .   The reada and writa calls take additional arguments in the firqb: fqfil is the AST address, fqppn the AST argument, and fqnam1 the event flag number.   I pulled that out of the code so I don't have the details; it's in the V9.0 or later system calls manual.

	paul

-----Original Message-----
From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Johnny Billquist
Sent: Friday, April 13, 2012 12:18 PM
To: hecnet at Update.UU.SE
Subject: Re: [HECnet] Web-server under RSX-11M-PLUS

On 2012-04-13 17:20, Paul_Koning at Dell.com wrote:
...
Oh yes, RSTS does have asynchronous I/O with ASTs, starting with V9.0.   
They are only really async for selected devices: disk file I/O, and 
streaming tapes (TS11 and TMSCP).   That was done to make backup to streaming tapes run at civilized performance.

Really? I didn't know that, but then I stopped using RSTS/E after V8, so things after that are a bit more unknown to me. How did they implement it? The existing user operations don't have any obvious place that AST hooks could fit, that I remember. Some spare field in the FIRQB that could hold the AST address?

	Johnny