Newsgroups: comp.sys.mac.programmer
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!snorkelwacker.mit.edu!ira.uka.de!smurf!urlichs
From: urlichs@smurf.sub.org (Matthias Urlichs)
Subject: Re: read,ASYNC
Message-ID: <-1D-PDN@smurf.sub.org>
Date: Sat, 15 Jun 1991 13:41:43    
Organization: University of Karlsruhe, FRG
References: <178@iitinc.UUCP> <13826@goofy.Apple.COM>
Lines: 20

In comp.sys.mac.programmer, article <13826@goofy.Apple.COM>,
  REEKES@applelink.apple.com (Jim Reekes) writes:
< 
< HFS is asychronous, but the SCSI Manager is not.  So reading from a SCSI
< disk will always be done synchronously.  Floppies and servers do read/write
< asychronously.
< 
"Always" until Apple does the async SCSI Manager they have once (a long long
time ago) told us about in the 7.0 pre-pre-documentation.

When that may happen is anybody's guess. I'm not holding my breath.

NB: The File manager is asynchronous, but under 6.0 it was anybody's guess
how to let it handle multiple requests concurrently (a requirement for
file-sharing software if you want to avoid deadlocks when cross-mounting).
Has that changed under 7.0? If not, how does 7.0's file sharing do it?

-- 
Matthias Urlichs -- urlichs@smurf.sub.org -- urlichs@smurf.ira.uka.de     /(o\
Humboldtstrasse 7 - 7500 Karlsruhe 1 - FRG -- +49-721-621127(0700-2330)   \o)/