Porting to i686-msdosdjgpp

[Magnus Ihse Bursie]

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. 
https://archive.org/details/phoneme-svn.dump for the source code.

/Magnus


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