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Date: Thu, 07 Feb 2002 11:37:06 +0100
To: djgpp AT delorie DOT com
From: Martin Steuer <martinSteuer AT gmx DOT de>
Subject: Strange gdb behaviour
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Reply-To: djgpp AT delorie DOT com

Hello everybody!

When I was debugging a program with a loop I set a breakpoint in it and 
found that the interrupts where erroneously disabled (the loop could only 
be left by pressing a specific key). I could verify that only the 
interrupts where disabled, the main program execution was going on.
At first I thought it would be a problem in my program, but at the end I 
could reduce it to a really simple loop, here it is:

#include <pc.h>
#include <conio.h>

int main()
{
  char key = 0;
  while (key != 27)
  {
//  __asm__ __volatile__ ("sti");
   if (kbhit()) key = getch();
  }
  return 0;
}

The interrupts get disabled whenever I set a breakpoint somewhere, it can 
be on EVERY line. If I uncomment the sti instruction it works.

The problem only occurs under pure dos, so I can imagine that it might be 
the result of a problem in cwsdpmi too.

I'm using gcc v 2.952, gdb v 5.0 and cwsdpmi reports v0.9+ (r5).

Any help would be nice, also if one could check this under different 
versions it would be good.

Thanks alot!