[Vm-dev] re: Can OSProcess functionality be implemented using FFI instead of plugin?

Dimitris Chloupis kilon.alios at gmail.com
Mon Jan 18 12:11:55 UTC 2016

AFAIK OS thread are capable of being assigned to multiple cores thus
offering real concurency, thus I presume your native threads are not OS
threads. So the VM run on one thread but can communicate with other threads
? Does that apply to multithreaded VM ?

On Mon, Jan 18, 2016 at 2:02 PM Eliot Miranda <eliot.miranda at gmail.com>

> Hi Dimitris,
> On Jan 18, 2016, at 3:29 AM, Dimitris Chloupis <kilon.alios at gmail.com>
> wrote:
> so I assume that means callbacks from inside C threads works fine which
> make it more than enough at least for now.
> C threads us a misnomer.  Callbacks from native threads that are currently
> calling out work.  I /think/ callbacks from native threads that have
> previously called out but are not currently calling out work, but am not
> sure.  Callbacks from native threads the VM has not seen before don't yet
> work; the VM doesn't service them.
> Does that mean that the VM will implement a real threading mechanism ?
> This is a mechanism that allows one to freely share the VM between
> arbitrary native threads but only one thread can run the VM at any one
> time.  So it provides true multi threading but it does /not/ provide
> concurrency.
> On Mon, Jan 18, 2016 at 1:11 PM Craig Latta <craig at netjam.org> wrote:
>> > ...when Craig Latta tried to use [Alien FFI] late last year it worked
>> > up to a point.  The thing that didn't work was callbacks from foreign
>> > threads.  So it looks like the core threading code is not too far
>> > away from working.
>>      (Yes, it seemed close enough that I spent several hours debugging,
>> trying to get it the rest of the way. I ran out of time, so I wrote a
>> wrapper C library around the one I wanted to use, with threaded C
>> callback functions that signalled Smalltalk semaphores on which my
>> synchronous-FFI Smalltalk process waited. A hack, but it worked fine and
>> was simple.)
>> -C
>> --
>> Craig Latta
>> netjam.org
>> +31   6 2757 7177 (SMS ok)
>> + 1 415  287 3547 (no SMS)
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