Path: utzoo!attcan!uunet!munnari.oz.au!uniwa!vaxa.uwa.oz!a_dent
From: a_dent@vaxa.uwa.oz
Newsgroups: comp.sys.mac.programmer
Subject: RE:  10 open file limit - thanks but still puzzled
Message-ID: <1990Jun15.002653.1897@vaxa.uwa.oz>
Date: 14 Jun 90 16:26:53 GMT
Organization: University of Western Australia
Lines: 17

Thanks for all the advice on the 10 open file limit - all the answers seem
to point to that limit being somewhat flexible.  I don't quite understand
how this limit can be expanded dynamically (one suggestion was to write an
XCMD to do so).  Quoting page 178 of IM vol 4 "The file-control-block-buffer
is a nonrelocatable block in the system heap, the first word contains the
length of the buffer.".  I can see that something such as Suitcase, if 
named to install earlier than other INITS, might be able to stretch this
block but surely an application would stuff up other items in the system
heap, if it tried to expand the block later?

BTW, from where did you guys get your multipliers as applied to the
"number of open files" field in the boot blocks?  I checked Technotes and
IM and the couldn't spot it!

Andy Dent                     A.D. Software phone 09 249 2719
Mac & VAX programmer          94 Bermuda Dve, Ballajura
a_dent@vaxa.uwa.oz            Western Australia  6066