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Programming-Idioms

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  • Rust

Idiom #33 Atomically read and update variable

Assign to the variable x the new value f(x), making sure that no other thread may modify x between the read and the write.

let mut x = x.lock().unwrap();
*x = f(x);

Assuming x is created like this:
`let x = Mutex::new(0);`
(def x (atom 0))
(def f inc)
(swap! x f)

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