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Concurrency · medium

31. Threads and Send/Sync

Fearless concurrency, checked by types.

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`std::thread::spawn` runs work in parallel; `move` closures transfer ownership. `Send` marks types safe to move across threads and `Sync` safe to share by reference. The compiler rejects data races instead of leaving them to testing.

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  1. 1. What does Sync mean?

  2. 2. Rc is not Send because…

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