DOS ain't dead

on overloading and AMIS (Developers)

posted by ecm  , Düsseldorf, Germany, 14.06.2011, 05:50

> Just as an aside, I hope you realize that doing this (and the fact that MS
> does it and some of my programs do it) means that your INT 15.4F handler
> must be fully re-entrant. It may already be without you realizing it (I
> haven't looked). But, if the user types a key on the keyboard at the same
> time INT 15.4F is being called from outside INT 09, and it's not fully
> re-entrant, you could have a big problem.

More precisely, only the 15.4FF4 handler needs to be reentrant since that's the one that the main KBFR program will call in an attempt to discover existing installed copies of it.

Note that I intentionally didn't say "your 15.4FF4" handler (which would just so happen to be reentrant, as (I think) your whole 15.4F handler is) but "the 15.4FF4" handler. There's a distinction to be made: At the time that you call 15.4FF4, you require all current 15.4F(F4) handlers to be reentrant. Even if there are handlers (intermediate or final) other than your own.

> I suspect INT 2Dh (AMIS) is probably more than sufficient for what
> you're trying to accomplish, even though I know it requires more
> memory than you want it to.

To be precise, 71 bytes plus indirect jumps made necessary by the Int15 IISP headers. An only partially compliant interface could get by with as few as 37 bytes.

---
l

Complete thread:

• KBFR 1.9 beta discussion opened by CM - Ninho, 13.06.2011, 12:17 (Developers)
  • discussion - ecm, 13.06.2011, 14:49
    • discussion - Ninho, 13.06.2011, 19:28
      • discussion - splitting MCBs again - ecm, 13.06.2011, 20:20
        • discussion - splitting MCBs again - Ninho, 13.06.2011, 21:52
          • discussion - splitting MCBs again - bretjohn, 13.06.2011, 22:38
            • discussion - splitting MCBs again - ecm, 13.06.2011, 23:41
              • discussion - splitting MCBs again - bretjohn, 14.06.2011, 00:17
            • discussion - splitting MCBs again - Ninho, 14.06.2011, 02:05
              • discussion - splitting MCBs again - ecm, 14.06.2011, 02:10
                • discussion - splitting MCBs again - Ninho, 14.06.2011, 04:09
                  • ! - ecm, 14.06.2011, 05:17
                    • ! - Ninho, 14.06.2011, 05:59
                      • ! - ecm, 14.06.2011, 06:06
              • discussion - splitting MCBs again - bretjohn, 14.06.2011, 05:11
                • on overloading and AMIS - ecm, 14.06.2011, 05:50
                • discussion - splitting MCBs again - Ninho, 14.06.2011, 13:38
          • discussion - splitting MCBs again - ecm, 13.06.2011, 23:33
            • discussion - splitting MCBs again - Ninho, 14.06.2011, 01:31
              • discussion - splitting MCBs again - ecm, 14.06.2011, 02:20
                • discussion - splitting MCBs again - Ninho, 14.06.2011, 04:05
                  • discussion - splitting MCBs again - ecm, 14.06.2011, 05:54
                    • discussion, & "retiring" for awhile - Ninho, 14.06.2011, 12:50
                      • DOSLFN, intermediate handler issued calls; "retiring" - ecm, 14.06.2011, 18:51
                        • intermediate handler issued calls - Ninho, 15.06.2011, 15:32
                          • intermediate handler issued calls - ecm, 15.06.2011, 16:50
                            • intermediate handler issued calls - Ninho, 15.06.2011, 17:53
                              • intermediate handler issued calls - ecm, 15.06.2011, 22:37