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Hi Gaspard,


This is a difficult one: I have an OS thread that keeps hold of a
function in lua with luaL_ref(L, LUA_REGISTRYINDEX). But the OS thread
is created in Lua:

thread = rk.Thread(function()
   -- do this and that
end

After some time, the thread is garbage collected.

How can I remove the function from the registry ? I cannot call
luaL_unref in the rk.Thread destructor (segfault).
I'm not sure I have the full picture here, but why not give your thread userdata an environment table and then keep hold of the function in that environment table instead of in the global registry? Once your thread is garbage collected the environment table should be destroyed and any references in that table should automatically seize to exist. 

 - Peter Odding