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From: RayeR <glaux AT centrum DOT cz>
Newsgroups: comp.os.msdos.djgpp
Subject: PM interrupt handling - how to call old old ISR with slower rate than my new ISR
Date: Thu, 01 Nov 2007 17:27:50 -0700
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

I'd like to hook timer interrupt with my new ISR so I did it with
_go32_dpmi_chain_protected_mode_interrupt_vector(INT_TIMER,&timer_isr_new);
works well but it makes some wrapper code which calls old timer ISR
_every_ time
after finished my ISR. I run timer on higher speed and I want that old
ISR will be called
say once per 256 interrupts. Can I safely call IRET at end of my ISR
to prevent permanent
old ISR calling? Or how do I setup it via
_go32_dpmi_set_protected_mode_interrupt_vector?
How to call old ISR? Maybe asm(lcall...) but I readed far jumps are
forbidded in ISR.