[whatwg] WebWorkers vs. Threads
Shannon
shannon at arc.net.au
Tue Aug 12 02:51:55 PDT 2008
>>
>>
>> --http://lua-users.org/wiki/CoroutinesTutorial
>>
>> Is this description incorrect? It seems at odds with what you said
>> about Lua coroutines getting an OS thread (if one is available).
>
> The description you quoted from lua-users.org is correct. The primary
> implementation of Lua is 100% portable ISO C, it therefore does _not_
> use OS threads for coroutines. I think there may be
> extensions/modifications produced by other parties that provide that.
>
> David Jones
> Ravenbrook Limited
>
Sorry about the misinformation. I've been working on Lua programs with
thousands of coroutines running and never noticed any artifacts or
delays to indicate the execution wasn't truly parallel. What I don't
understand is why it doesn't appear to block other coroutines on IO but
since that's not relevant to creating threaded workers I'll leave that
mystery for future research.
I thought Lua had an implementation of automated locking to use as a
reference but since it doesn't I have nothing more to offer on the
subject. Without knowing the internals of existing JS implementations I
have no idea what would be involved to provide automated locking and
whether it is impossible or just difficult.
Shannon
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