From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,6543bf63afffd95a
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 1995-02-08 08:50:31 PST
Path: 
 swrinde!cs.utexas.edu!uwm.edu!news.alpha.net!news.mathworks.com!zombie.ncsc.mil!news.duke.edu!agate!boulder!news.coop.net!news.den.mmc.com!iplmail.orl.mmc.com!usenet
From: "Theodore E. Dennison" <dennison@escmail.mmc.orl.com>
Newsgroups: comp.lang.ada
Subject: Re: Unbuffered Keyboard I/O
Date: 8 Feb 1995 15:38:50 GMT
Organization: IPL InterNetNews site
Message-ID: <3haoia$3aj@theopolis.orl.mmc.com>
References: <1995Feb3.071931.1@clstcs>
NNTP-Posting-Host: milkyway.orl.mmc.com
Date: 1995-02-08T15:38:50+00:00
List-Id: <comp.lang.ada>

amlombardi@vms4.sci.csupomona.edu wrote:
>
> I posted earlier about unbuffered keyboard io, well it works really well (i
> used the one at owens.ridgecrest.ca.us) but when the package initializes itself
> it must screw with the i/o channels some how because the PUT statement does not
> work but all the others like PUT_LINE and NE~W_LINE work... PUT actually will
> show up after a PUT_LINE or a NE~W_LINE or quitting the program... anyone have
> any ideas on how to fix this?  Thanx in advance

Actually, this is quite common behavior for PUT. On many systems, PUT
I/Os are buffered, and only PUT_LINEs and NEW_LINEs flush that buffer.

In many OS's (VMS for one) exitting a program automaticly flushes all
I/O buffers.

I know VAX Ada exihibts this behavior. There may be other Ada's that 
do it as well.

The solution to this in VMS is to either 
  - Use PUT_LINE or NEW_LINE when the text absolutely HAS to be
    displayed.
  - Use the SMG package instead of Text_IO
  - Use QIOs (YUUUUCK!)
  - Use the FORM parameter when you open the text file to get Text_IO
    to not buffer any writes (I hope you are an RMS expert!)

If you ARE using VAX Ada, I suggest SMG.

T.E.D.