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On Mar 25, 2008, at 9:25 PM, Eugen-Andrei Gavriloaie wrote:

L2 = lua_newthread(L);
lua_pushvalue(L, true);
Stack status:  elem1 elem2 ..... elemN thread true [top of the stack]

lua_settable(L, LUA_REGISTRYINDEX); // pops the thread from the parent state
This is translated into:
t[thread]=true. Is this correct?


Stack status:  elem1 elem2 ..... elemN thread nil [top of the stack]

lua_settable(L2, LUA_REGISTRYINDEX);
t[thread]=nil. Is this correct? If it is that means that putting nil value into a table removes that pair?

Yes. Setting a value to nil in Lua removes a reference; any value with no reference is available for garbage collection.