I have only one thread in ruby side with a infinite loop. I want to
suspend that thread and return to C++ and resume it next frame.
As I known, rb_eval_string can't return unless all your ruby thread are
finished. Thread.sleep will block your system thread if you have only
one ruby thread. Is that right?
I really want to keep the loop in ruby side. not c++ side.
So how can I do this?
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