Message-ID: <000a01c02ed1$66e06b40$LocalHost@PRMIVV03>
From: "Petr Maxa" <maxa AT sse-za DOT sk>
To: <djgpp AT delorie DOT com>
Subject: Protected mode access to file system
Date: Thu, 5 Oct 2000 15:37:25 +0200
Organization: SSE s.p. Zilina
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Reply-To: djgpp AT delorie DOT com

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Hi all.

First of all I must to congratulate to a great job as with djgpp I have
found a bug at an exact place which I would not have been found so easy
without it.

Secondly I must say, that I thought, that djgpp is approximately 2 times
slower compiler than Borland. But I have eventually found that the opposite
is true. But why ? It was because I was testing the end of program loop by
bioskey(1) which in turn was calling realmode interrupt service 0x16, so
switching to real mode. So the real mode - protected mode is very costed.

So I installed keyboard driver and when the switching does not occurred, I
found that djgpp is 2 times faster than Borland.

OK, but I am still not satisfied completely because my program is making a
lot serial communications on several ports (from 4 to 10 ports are used).
For that communications I set-up protected mode isr. But I am afraid that
when I write data to disk there might be some collision and overwhelm during
the same mode switching as was stated above. I am also suspicious that due
to using real mode services during compilation, the compilation time of
djgpp is slow.

So there is a question. Is not anywhere developed an library which uses a
only 32 protected mode to files access (open, close, read, write, seek ...)
which would run under DOS (not DOS box under W9X).

Thanks a lot, Petr Maxa, Slovakia


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