Porting to i686-msdosdjgpp

[Magnus Ihse Bursie]

On 2021-11-17 14:27, Thomas Stüfe wrote:
>
>
> On Wed, Nov 17, 2021 at 1:57 PM Magnus Ihse Bursie 
> <magnus.ihse.bursie at oracle.com> wrote:
>
>
>
>     On 2021-11-16 07:19, Thomas Stüfe wrote:
>>
>>
>>     On Mon, Nov 15, 2021 at 11:09 PM David Holmes
>>     <david.holmes at oracle.com> wrote:
>>
>>         On 16/11/2021 12:06 am, gnufan42 wrote:
>>         > David Holmes wrote:
>>         >> I'd say it is technically impossible to port OpenJDK to
>>         DOS as you do
>>         >> not have any of the necessary operating system support for
>>         threads,
>>         >> synchronization, virtual memory, ....
>>         >
>>         >       Well, these difficulties are all overcame by the
>>         DJGPP project. They use DPMI to let the code runs in 32-bit
>>         protected mode, they implemented a lot of POSIX functions,
>>         including pthread. Otherwise I won't be trying.
>>
>>         I'd never heard of DJGPP but the pthread support still seems
>>         limited -
>>         hard to find an accurate current description of what is actually
>>         supported. So I would not say these difficulties are overcome
>>         :) This
>>         will be an exceedingly complex and challenging project.
>>
>>         Cheers,
>>         David
>>
>>
>>     I still think that the CVM (JavaME) may be better suited for the
>>     task. From the time I worked with it I remember that it was
>>     targeted to low-memory devices, its C code base was extremely
>>     portable, it was very configurable (important for embedded) etc.
>>     We ran it with green threading (like Loom today) and that worked.
>>     OpenJDK OTOH relies on native posix threads, and there is no easy
>>     way around that.
>>
>>     I seemed to remember that Sun open-sourced JavaME in 2006. But I
>>     could not find the project page.
>>
>>     https://en.wikipedia.org/wiki/Java_Platform,_Micro_Edition
>>     https://en.wikipedia.org/wiki/PhoneME
>>
>>     PhoneME website seems defunct now. Does anyone know what happened
>>     with that project?
>     Wikipedia has links to archive.org <http://archive.org>.
>     https://archive.org/details/phoneme-svn.dump for the source code.
>
>     /Magnus
>
>
>
> Ah, I missed that. But seems this project is not actively maintained 
> anymore. Pity.
Yes, it's a shame. I felt sorry for the source code, just lying rotting 
there as a SVN dump on archive.org, so I installed subversion, made a 
few scripts, and converted it to git and put it on Github. [1]

That won't bring active development back, but at least the source code 
is accessible for archaeological reasons. And maybe it'll be enough to 
get someone to bring it back to life...

/Magnus

[1] https://github.com/magicus/phoneME

>>
>>     Cheers, Thomas
>>
>>
>>         > Thanks,
>>         > Gnufan
>>         >
>>
>
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