DOS ain't dead - DPMILD32 issues - spawn trouble: solution found ???

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

posted by Japheth , Germany (South), 21.02.2008, 12:42

> Just what does "to some extent" mean exactly.

"to some extent" means: "to a certain extent" (sorry for my bad English :-D )

Thread priorities aren't supported, but "SetThreadPriority()" isn't a no-op, because changing a thread's priority to "real-time" will have "some" impact - IIRC.

> Does HX implement priority boosting?

There is some code suggesting that it is implemented, but it is almost 12 years old and I doubt it will survive a review - therefore I don't even try.

> How does it handle file I/O and other DOS calls?

It calls int 21h with register AX set "properly".

When the "indos" flag is set, no thread switching is done.

> What is the timeslice, and can it be changed?

it is 20 ms and it can be changed in the source.

> Does a complete timeslice have to have elapsed before a context-switch can
> occur?

"Usually" yes. :-D

> What timer does it use - the PIT#0 or the RTC interrupt?

The RTC - "usually" (that is, it can optionally be changed to use the PIT timer).

> Can an application reprogram PIT#0 without it screwing up the task
> scheduler?

The scheduler might not be worried too much. But why should a Win32 program come to think that it can "reprogram" the hardware?

---
MS-DOS forever!

Post reply

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