DOS ain't dead

DPMILD32 issues - spawn trouble: solution found ??? (DOSX)

posted by Japheth , Germany (South), 20.02.2008, 12:13

> In other forum you mentioned DPMILDR=8 only, so I missed the HDPMI=32

It's explained very lengthy in COMPAT.TXT ...

> 1. DPMILDR=8 : but why not suppress this hack, check for address space &
> fixups, and load into same if possible, and into a new one otherwise ?

I can't remember the reasons, but there WERE strong reasons why this didn't work. If you can supply a working patch ...

> 2. HDPMI=32 : OK, making this the default would hog low memory

It's not just the memory. It's simply not DPMI 0.9 compatible, would make DPMI v0.9 TSRs impossible. And one of my favorite toys - debxxf - also runs as separate client and wants direct access to the debuggee's memory, IDT and LDT.

> Anyway, in DOS there is no true multitaxing, just spawning, A spawns B,
> thus A is suspended while B is running, when B has done, A resumes ... and
> the obvious (or did I miss something ?) solution arises: when A spawns B,
> just allocate a memory block with size of A at highest free / some high
> and free address, move A there, free the famous throne at $400000, load B
> into there, run B, and when B has done just move A back and resume it
>

Yes, that's possible, but is just another hack. For Win32 programs, the HDPMI=8 "hack" is preferable IMO since it is very stable and, more important, this appproach will finally allow to run several clients/tasks concurrently. Some Win32 applications need that (i.e. CygWin).

---
MS-DOS forever!

Complete thread:

• DPMILD32 issues - DOS386, 19.02.2008, 03:06 (DOSX)
  • DPMILD32 issues - Japheth, 19.02.2008, 04:25
    • DPMILD32 issues - spawn trouble: solution found ??? - DOS386, 20.02.2008, 03:40
      • DPMILD32 issues - spawn trouble: solution found ??? - Japheth, 20.02.2008, 12:13
        • DPMILD32 issues - spawn trouble: solution found ??? - DOS386, 21.02.2008, 01:55
          • DPMILD32 issues - spawn trouble: solution found ??? - Japheth, 21.02.2008, 05:32
            • DPMILD32 issues - spawn trouble: solution found ??? - jaybur, 21.02.2008, 07:59
              • DPMILD32 issues - spawn trouble: solution found ??? - Japheth, 21.02.2008, 10:47
                • DPMILD32 issues - spawn trouble: solution found ??? - jaybur, 21.02.2008, 12:02
                  • DPMILD32 issues - spawn trouble: solution found ??? - Japheth, 21.02.2008, 12:42
                    • DPMILD32 issues - spawn trouble: solution found ??? - jaybur, 22.02.2008, 01:49
                      • GV32 - DOS386, 22.02.2008, 02:48
                        • GV32 - jaybur, 22.02.2008, 04:00
                          • GV32 - Japheth, 22.02.2008, 06:54
                            • GV32 - jaybur, 22.02.2008, 07:45
            • DPMILD32 issues - spawn trouble: solution found ??? - DOS386, 22.02.2008, 02:57
              • DPMILD32 issues - spawn trouble: solution found ??? - Japheth, 22.02.2008, 07:18
                • DPMILD32 issues - POASM - DOS386, 26.02.2008, 13:54
                  • The "million flies..." argument again? - Japheth, 26.02.2008, 16:32
                    • The "million flies..." argument again? - rr, 26.02.2008, 17:47
                      • The "million flies..." argument again? - Japheth, 27.02.2008, 07:38
                        • The "million flies..." argument again? - rr, 27.02.2008, 09:37
                    • The "million flies + ONE elephant" argument again - DOS386, 01.03.2008, 02:29
                      • The "million flies + ONE elephant" argument again - Japheth, 01.03.2008, 05:58
                      • DOS386 commands! - Steve, 01.03.2008, 06:35
                • [] issues (for GR keyboard users) - Rugxulo, 27.02.2008, 01:36
                  • [] issues - FASM riddle waiting to be solved - Japheth, 27.02.2008, 07:33
                    • [] issues - FASM riddle waiting to be solved - rr, 27.02.2008, 09:44
                      • [] issues - FASM riddle waiting to be solved - Japheth, 27.02.2008, 18:28
                        • [] issues - FASM riddle waiting to be solved - rr, 27.02.2008, 21:27
                      • [] issues - FASM riddle waiting to be solved - Rugxulo, 27.02.2008, 19:05
                        • [] issues - FASM riddle waiting to be solved - rr, 27.02.2008, 21:32
                          • [] issues - FASM riddle waiting to be solved - Rugxulo, 28.02.2008, 00:28
      • DPMILD32 issues - spawn trouble: solution found ??? - flox, 21.02.2008, 09:42