From:	"Michel Gallant" <mgallant AT NOSPAM DOT grassroots DOT ns DOT ca>
Newsgroups:	comp.os.msdos.djgpp
References:	<C22A1.62$Qi3 DOT 325552 AT sapphire DOT mtt DOT net> <35D0BF71 DOT 9FB3EE0B AT unb DOT ca>
Subject:	Re: Detecting interrupt on printer port
Lines:	27
Message-ID:	<625A1.98$Qi3.473241@sapphire.mtt.net>
Date:	Wed, 12 Aug 1998 00:08:34 GMT
NNTP-Posting-Host:	142.177.38.71
NNTP-Posting-Date:	Tue, 11 Aug 1998 21:08:34 ADT
Organization:	MTT
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Endlisnis wrote in message <35D0BF71 DOT 9FB3EE0B AT unb DOT ca>...
>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.
>
Thanks for the suggestion, but the problem lies elsewhere.  For
starters, this program works fine when it is changed to intercept INT8
(timer tic), and besides that, I tried your recommendation with no
effect.  Thanks anyway, though.  Suggestions, anyone?  I'd appreciate
any help.

Michel Gallant

- Raw text -