W3C home > Mailing lists > Public > whatwg@whatwg.org > August 2008

[whatwg] WebWorkers vs. Threads

From: Shannon <shannon@arc.net.au>
Date: Tue, 12 Aug 2008 19:51:55 +1000
Message-ID: <48A15D3B.4090401@arc.net.au>

>> --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.


Received on Tuesday, 12 August 2008 02:51:55 UTC

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