Hello!
28.05.2016, 14:14, "Björn Lindqvist" <bjou...@gmail.com>:
> Hello,
>
> Here is some sample code to run:
>
> USING: alien io kernel threads.private windows.kernel32
> windows.types ;
> IN: examples.windows.threads
>
> : eternity ( -- ) eternity ;
>
> : <ThreadProc> ( -- alien )
> DWORD { LPVOID } stdcall [ drop eternity 0 ] alien-callback ;
>
> : start-thread ( -- handle )
> f 0 <ThreadProc> f 0 f CreateThread ;
>
> : main ( -- )
> start-thread drop
> "I am here" print flush
> 20,000,000,000 (sleep) ;
>
> MAIN: main
>
> As you can see, it taxes the cpu 100% which proves that the thread is
> running. Then something triggers a gc and it crashes. It is not
> unexpected.
I see now. I've modified the main word to contain "start-thread drop
eternity", and it doesn't crash. I see two threads happily busy forever. This
means that the code works. It was confusing for me before this experiment,
because what I saw was an instant crash. I guess the reason must be that GC is
called all the time by the UI (maybe it's specific to Windows implementation).
And if you don't get back to the UI, no GC, no crash.
At least that's a theory one can work with. Let's assume it's the GC's fault.
> You are kind of entering unexplored territory here. No one has ensured
> that factor works correctly when running kernel threads containing
> factor code. You aren't meant to do it.
I remember in Slava's Google Talk there were some plans for native
multithreading...
https://www.youtube.com/watch?v=f_0QlhYlS8g
> However, you can start and run a thread written in C++ in the VM using
> start_thread() as long as you are careful not to mess with the
> factor_vm object in unapproved ways. You can see how it is done in
> start_sampling_profiler_timer() in vm/os-windows.cpp.
Yes, I'll have to try that approach, although it would've been cool to stick
to the higher level language.
OTOH, maybe that kind of functionality does belong in the VM.
> I still don't understand how you can get that thread to trap the
> ctrl+break key combo. But if you can, then great!
---=====---
Александр
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