From:	Charles Sandmann <sandmann AT clio DOT rice DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: PB with multitask
Date:	Wed, 19 Jun 2002 12:38:37 CDT
Organization:	Rice University, Houston TX
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> the program work well, but when I call a bios function the multitasking is
> disable because the task commutation is do by the exceptions. it's possible 
> to forced the exception when I am inside the bios function???

No.  BIOS calls are not reentrant in general, so you can't interrupt them
(or DOS) in a multi-tasking environment.  Even if you could, there is
no way to signal this to the 32-bit DPMI application.

The fix is to avoid calling the BIOS and convert that function to 32-bit
code and put it in your image.

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