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John Klimek wrote:

Is it safe to create several (hundreds?) of threads and yield/resume
each of them independantly?

Not sure what you mean by 'independently'. From a single OS thread, you can create a few hundreds and then yield/resume one at a time. To create more, AFAIK you have to recompile the library after increasing LUAI_MAXCSTACK.

To have several threads running concurrently (from different OS threads, perhaps), I think you have to redefine 'lua_lock' and related defines.

There is a chapter in 'Programming in Lua' about non-preemptive multithreading that may be useful to read.