src/tools/clippy/tests/ui/missing_spin_loop.rs

   1 // run-rustfix
   2 #![warn(clippy::missing_spin_loop)]
   3 #![allow(clippy::bool_comparison)]
   4 #![allow(unused_braces)]
   5
   6 use core::sync::atomic::{AtomicBool, Ordering};
   7
   8 fn main() {
   9     let b = AtomicBool::new(true);
  10     // Those should lint
  11     while b.load(Ordering::Acquire) {}
  12
  13     while !b.load(Ordering::SeqCst) {}
  14
  15     while b.load(Ordering::Acquire) == false {}
  16
  17     while { true == b.load(Ordering::Acquire) } {}
  18
  19     while b.compare_exchange(true, false, Ordering::Acquire, Ordering::Relaxed) != Ok(true) {}
  20
  21     while Ok(false) != b.compare_exchange(false, true, Ordering::Acquire, Ordering::Relaxed) {}
  22
  23     // This is OK, as the body is not empty
  24     while b.load(Ordering::Acquire) {
  25         std::hint::spin_loop()
  26     }
  27     // TODO: also match on loop+match or while let
  28 }