On 2021-11-16 07:19, Thomas Stüfe wrote:
On Mon, Nov 15, 2021 at 11:09 PM David Holmes
<[email protected]> 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
>
