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The choice of using Rust to implement the internals of our runtime now plays a much more decisive role now, given we're in a multi-threaded context. The Rust language provides a bunch of useful primitives to deal with multi-threaded code: for instance, in the prior section, we described the Event object to be a wrapper around an atomic flag, but when we represented that object in pseudo-Python code, we noted that as a boolean. Rust provides an atomic module with a bunch of useful primitives, like an actual atomic boolean flag: we can use these primitives without re-implementing everything from scratch, and make Python code to interact with those primitives through wrappers.
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Similar form in Scheme:
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