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I noticed that Lua hooks are usually used for
interrupting running Lua code (with a lua_error

I wonder if it is "safe" (no stack corruption,
etc.) to do something else in a count hook :
for example calling other Lua functions, or
resuming a coroutine.

Otherwise, how would you do in order to be able
to execute Lua code periodically (e.g resuming
coroutines) while the main Lua state is doing
something else ? (e.g a big loop) without using
OS-level threads ?

Thanks in advance for your answers,