Re: [Factor-talk] Thread safe factor VM (WIN32)

[Slava P. <sl...@fa...>]

OS X supports a limited form of thread local storage which is
implemented with a hashtable underneath, so it is slow. I forget the
details now though.

Slava

On Mon, Jul 27, 2009 at 3:05 PM, Phil Dawes<ph...@ph...> wrote:
> Thanks Joe - that sounds like a good idea.
>
> I also saw this today, which says that osx doesn't have support for
> thread local storage at all. Have I understood that right?:
> http://dobbscodetalk.com/index.php?option=com_myblog&show=Porting-D-to-the-Mac.html&Itemid=29
>
> Cheers,
>
> Phil
>
> Joe Groff wrote:
>>> Hi All,
>>>
>>> Quick update:
>>>
>>> Last night I managed to get win32 factor to bootstrap and run on my
>>> linux laptop using wine and mingw32 so I can now do some windows
>>> portability coding. Unfortunately I'm having some problems with the
>>> reentrancy code, which I guess are also problems on 'real' win32
>>> platforms too.
>>>
>>> After some limited testing my best guess is that thread-local-
>>> storage is
>>> causing problems with LoadLibrary (dlsym) loaded symbols. Internal
>>> variables are fine but those externally referenced in factor code
>>> indirectly using the rel-dlsym word (e.g. words in x86.factor) seem to
>>> crash the vm.
>>
>> At a glance it looks like the "nursery" pointer is the only thing the
>> compiler references out of the VM. You could add a VM primitive to
>> return the nursery symbol if that's the case. If I'm wrong and there
>> are other VM symbols referenced from Factor code, you could take
>> Slava's advice and roll all the global VM state into a single thread-
>> local struct variable, then add a primitive that returns a pointer to
>> that struct. You could then replace all references to VM symbols with
>> alien struct accessors.
>>
>> -Joe
>>
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