On Wed, 11 Aug 2004, Bart Oldeman wrote:
Hello Bart,
The section is not from me, but it simply is to inform a multitasking scheduler that something bad happens currently -- in a simple case it's just an extended InDOS flag.
ASSIGN has to issue these calls, too, I believe to inform a protected mode portion that it has modified user space memory and it would be no good thing to return to that process before ASSIGN restored that memory.
Maybe it is even needed for Win3.xx to unlock some memory protection?
The only data it requires - as far as I know - is register AX, to inform the handler what type of Critical section is going on. At least ASSIGN does NOT include the PUSH AX's. However, maybe you can successfully search the archives, there was some discussion about how Windows 3 is patching MS DOS, and when you see RBIL's INT-2A-80 it makes sense to patch PUSH AX into RET and vice verse to enable / disable critical sections, see DOS-5D-06 for _DOS 3_ (but zero -> non-zero for DOS 4+).
;
; end Dos Critical Section 0 thur 7
;
;
dos_crit_sect:
mov [_Int21AX],ax ; needed!
push ax ; This must be here!!!
mov ah,82h ; re-enrty sake before disk stack
int 2ah ; Calling Server Hook!
pop ax
ret
Bye,
--
Steffen Kaiser
FH Bonn-Rhein-Sieg | e-mail: [EMAIL PROTECTED] FB Informatik | Grantham-Allee 20 | phone : +49 2241/865-203 53757 Sankt Augustin | Germany - Deutschland | fax : +49 2241/865-8203
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