Euphoria interpreter support multiple threads in the same program. On MS-DOS 5.0 had a task switch utility DOSSHELL. Was not very popular but offered a simple multitasking. Something like win31 on standar mode with all the programs on full screen mode.
2010/4/7, Eric Auer <e.a...@jpberlin.de>: > > Hi Geraldo, > >> while we can't push any much modern idea would >> be possible to implement a thread facility in FD >> kernel using protothread http://www.sics.se/~adam/pt/ ? >> it would allow many interesting things >> or at least, we could use on FD install to >> unzip packages in parallel? > > For unzipping in the background in the installer, > it would be easier to make the installer itself > use multithreading, not the kernel. As far as I > remember, the installer already does the unzip > itself, so it does not call unzip exe for this. > > The kernel does not normally wait a lot for things, > but of course it would be interesting to be able > to let several DOS apps use the kernel at the same > time. However, that would be more multitasking than > multithreading. The tricky topic is "reentrancy": > > While the kernel works for program X, if program Y > calls it, the status of the work in progress must > not be in the way. But in DOS, it must be, because > the interface of DOS is designed that way, I think. > > The only thing that you can do is swapping the SDA > (swappable data area) to save / restore state when > Y wants to interrupt and use the kernel for a moment > while normally the kernel would be busy with work > for program X at that moment. > > Anyway - multithreading inside one program, for > example the installer which would also unzip data > in the background - is easy if you have a library > and compiler for it. The only DOS thing you have > to do is make sure that no two threads use any DOS > services at the same time, but for that, you can > put all kernel access into a piece of your code > which takes care of this exclusive access check. > > Eric > > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > _______________________________________________ > Freedos-user mailing list > Freedos-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freedos-user > -- -- +-+-+-+-+-+-+-+ Marco A. Achury Tel: +58-(212)-6158777 Cel: +58-(414)-3142282 Skype: marcoachury Ekiga.net: marcoachury http://www.achury.com.,ve ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
