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% Concurrency and Paralellism
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Rust as a language doesn't *really* have an opinion on how to do concurrency or
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parallelism. The standard library exposes OS threads and blocking sys-calls
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because *everyone* has those, and they're uniform enough that you can provide
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an abstraction over them in a relatively uncontroversial way. Message passing,
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green threads, and async APIs are all diverse enough that any abstraction over
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them tends to involve trade-offs that we weren't willing to commit to for 1.0.
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However the way Rust models concurrency makes it relatively easy design your own
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concurrency paradigm as a library and have *everyone else's* code Just Work
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with yours. Just require the right lifetimes and Send and Sync where appropriate
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and you're off to the races. Or rather, off to the... not... having... races.
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