46 lines
2.4 KiB
Rust
46 lines
2.4 KiB
Rust
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#![warn(clippy::invalid_atomic_ordering)]
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use std::sync::atomic::{AtomicUsize, Ordering};
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fn main() {
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// `compare_exchange` (not weak) testing
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let x = AtomicUsize::new(0);
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// Allowed ordering combos
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let _ = x.compare_exchange(0, 0, Ordering::Relaxed, Ordering::Relaxed);
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let _ = x.compare_exchange(0, 0, Ordering::Acquire, Ordering::Acquire);
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let _ = x.compare_exchange(0, 0, Ordering::Acquire, Ordering::Relaxed);
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let _ = x.compare_exchange(0, 0, Ordering::Release, Ordering::Relaxed);
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let _ = x.compare_exchange(0, 0, Ordering::AcqRel, Ordering::Acquire);
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let _ = x.compare_exchange(0, 0, Ordering::AcqRel, Ordering::Relaxed);
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let _ = x.compare_exchange(0, 0, Ordering::SeqCst, Ordering::Relaxed);
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let _ = x.compare_exchange(0, 0, Ordering::SeqCst, Ordering::Acquire);
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let _ = x.compare_exchange(0, 0, Ordering::SeqCst, Ordering::SeqCst);
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// AcqRel is always forbidden as a failure ordering
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let _ = x.compare_exchange(0, 0, Ordering::Relaxed, Ordering::AcqRel);
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let _ = x.compare_exchange(0, 0, Ordering::Acquire, Ordering::AcqRel);
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let _ = x.compare_exchange(0, 0, Ordering::Release, Ordering::AcqRel);
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let _ = x.compare_exchange(0, 0, Ordering::AcqRel, Ordering::AcqRel);
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let _ = x.compare_exchange(0, 0, Ordering::SeqCst, Ordering::AcqRel);
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// Release is always forbidden as a failure ordering
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let _ = x.compare_exchange(0, 0, Ordering::Relaxed, Ordering::Release);
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let _ = x.compare_exchange(0, 0, Ordering::Acquire, Ordering::Release);
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let _ = x.compare_exchange(0, 0, Ordering::Release, Ordering::Release);
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let _ = x.compare_exchange(0, 0, Ordering::AcqRel, Ordering::Release);
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let _ = x.compare_exchange(0, 0, Ordering::SeqCst, Ordering::Release);
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// Release success order forbids failure order of Acquire or SeqCst
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let _ = x.compare_exchange(0, 0, Ordering::Release, Ordering::Acquire);
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let _ = x.compare_exchange(0, 0, Ordering::Release, Ordering::SeqCst);
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// Relaxed success order also forbids failure order of Acquire or SeqCst
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let _ = x.compare_exchange(0, 0, Ordering::Relaxed, Ordering::SeqCst);
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let _ = x.compare_exchange(0, 0, Ordering::Relaxed, Ordering::Acquire);
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// Acquire/AcqRel forbids failure order of SeqCst
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let _ = x.compare_exchange(0, 0, Ordering::Acquire, Ordering::SeqCst);
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let _ = x.compare_exchange(0, 0, Ordering::AcqRel, Ordering::SeqCst);
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}
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