rust/tests/ui/atomic_ordering_fetch_update.rs

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#![warn(clippy::invalid_atomic_ordering)]
use std::sync::atomic::{AtomicIsize, Ordering};
fn main() {
// `fetch_update` testing
let x = AtomicIsize::new(0);
// Allowed ordering combos
let _ = x.fetch_update(Ordering::Relaxed, Ordering::Relaxed, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::Acquire, Ordering::Acquire, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::Acquire, Ordering::Relaxed, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::Release, Ordering::Relaxed, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::AcqRel, Ordering::Acquire, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::AcqRel, Ordering::Relaxed, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::SeqCst, Ordering::Relaxed, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::SeqCst, Ordering::Acquire, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::SeqCst, Ordering::SeqCst, |old| Some(old + 1));
// AcqRel is always forbidden as a failure ordering
let _ = x.fetch_update(Ordering::Relaxed, Ordering::AcqRel, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::Acquire, Ordering::AcqRel, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::Release, Ordering::AcqRel, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::AcqRel, Ordering::AcqRel, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::SeqCst, Ordering::AcqRel, |old| Some(old + 1));
// Release is always forbidden as a failure ordering
let _ = x.fetch_update(Ordering::Relaxed, Ordering::Release, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::Acquire, Ordering::Release, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::Release, Ordering::Release, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::AcqRel, Ordering::Release, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::SeqCst, Ordering::Release, |old| Some(old + 1));
// Release success order forbids failure order of Acquire or SeqCst
let _ = x.fetch_update(Ordering::Release, Ordering::Acquire, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::Release, Ordering::SeqCst, |old| Some(old + 1));
// Relaxed success order also forbids failure order of Acquire or SeqCst
let _ = x.fetch_update(Ordering::Relaxed, Ordering::SeqCst, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::Relaxed, Ordering::Acquire, |old| Some(old + 1));
// Acquire/AcqRel forbids failure order of SeqCst
let _ = x.fetch_update(Ordering::Acquire, Ordering::SeqCst, |old| Some(old + 1));
let _ = x.fetch_update(Ordering::AcqRel, Ordering::SeqCst, |old| Some(old + 1));
}