lua_lock

[Roberto Ierusalimschy <roberto@...>]

  The Lua reference mechanism (Section 5.6 of the manual) has an
option that allows C to keep a reference to a Lua object without preventing
the GC to collect the object. Does anyone use this option? It was supposed
to be useful in breaking 'reference cicles', when C keeps a reference to a
Lua object and Lua keeps a reference to the C object (userdata), and then they
would be never collected. But we are not sure whether anyone ever succeed in
using it...

-- Roberto