DOS ain't dead

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

posted by jaybur  , UK, 22.02.2008, 01:49

> > Just what does "to some extent" mean exactly.
>
> "to some extent" means: "to a certain extent" (sorry for my bad English
> )

It's not bad English, just ambiguous.

> 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.

Ok.

> > 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.

Right, so DOS calls are effectively serialized.

> > What is the timeslice, and can it be changed?
>
> it is 20 ms and it can be changed in the source.

But not programatically.

> > Does a complete timeslice have to have elapsed before a context-switch
> can occur?
>
> "Usually" yes.



> > 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).

Ok.

> > 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?

Why would a DOS program think it can't?

Is it your only goal to [partially] emulate Windows, or does HX aspire to be capable of being used for some things that Windows can't?

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