Xref:	news-dnh.mv.net comp.os.msdos.djgpp:4587
From:	Charles Sandmann <sandmann AT clio DOT rice DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Problem with locking real mode callbacks in beta4
Date:	Sun, 21 Jan 1996 14:56:49 CST
Organization:	Rice University, Houston, Texas
Lines:	33
Message-ID:	<3102a891.sandmann@clio.rice.edu>
References:	<DLJ7n7 DOT HHy AT jade DOT mv DOT net>
Reply-To:	sandmann AT clio DOT rice DOT edu
NNTP-Posting-Host:	clio.rice.edu
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

> I have everything working except my mouse code. This installs a callback 
> routine with the int33 mouse driver, using _go32_dpmi_allocate_real_mode_ \
> callback_retf(); I am convinced that I have locked all the memory ... gormcb.c
> seems to be locking the wrong bits of memory...

A known bug, fixed in the current work in progress (which seems to be destined
to become beta 5).  Beta 4 also doesn't lock the RMCB register structure (that 
was also added in the updated code).  Here is the patch:

*** ../src/libc/go32/gormcb.c	Fri Nov 17 00:24:56 1995
--- gormcb.c	Sun Jan 14 14:29:24 1996
***************
*** 92,96 ****
  	    return 0x8015;				\
  	  }						\
!           if( _go32_dpmi_lock_data( wrapper,            \
              stack_length) ) return 0x8015;              \
  	  ((long *)stack)[0] = STACK_WAS_MALLOCED;	\
--- 92,96 ----
  	    return 0x8015;				\
  	  }						\
!           if( _go32_dpmi_lock_data( stack,              \
              stack_length) ) return 0x8015;              \
  	  ((long *)stack)[0] = STACK_WAS_MALLOCED;	\
***************
*** 102,105 ****
--- 102,107 ----
  
    MALLOC_STACK();
+   if( _go32_dpmi_lock_data(regs, sizeof(__dpmi_regs)))
+     return 0x8015;
  
    *(short *)(wrapper+0x06) = __djgpp_ds_alias;

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