--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
