From:	Endlisnis <s257m AT unb DOT ca>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Detecting interrupt on printer port
Date:	Tue, 11 Aug 1998 19:02:25 -0300
Organization:	NBTel Internet
Lines:	21
Message-ID:	<35D0BF71.9FB3EE0B@unb.ca>
References:	<C22A1.62$Qi3 DOT 325552 AT sapphire DOT mtt DOT net>
NNTP-Posting-Host:	fctnts06c82.nbnet.nb.ca
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Michel Gallant wrote:

> //global counter
> int counter = 0;

use:
volatile int counter = 0;

You need to do this because DJGPP will likely move counter into a register
during the loop where you print the value in printf.  Setting a variable to
'volatile' forces DJGPP to reload 'counter' from memory every time it is
used.

--
     (\/) Endlisnis (\/)
          s257m AT unb DOT ca
          Endlisnis AT GeoCities DOT com
          Endlis AT nbnet DOT nb DOT ca

- Raw text -