mirror of
https://github.com/rust-lang/rust-clippy
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48 lines
2.6 KiB
Rust
48 lines
2.6 KiB
Rust
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#![warn(clippy::invalid_atomic_ordering)]
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use std::sync::atomic::{AtomicPtr, Ordering};
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fn main() {
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let ptr = &mut 5;
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let ptr2 = &mut 10;
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// `compare_exchange_weak` testing
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let x = AtomicPtr::new(ptr);
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// Allowed ordering combos
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let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Relaxed, Ordering::Relaxed);
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let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Acquire, Ordering::Acquire);
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let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Acquire, Ordering::Relaxed);
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let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Release, Ordering::Relaxed);
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let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::AcqRel, Ordering::Acquire);
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let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::AcqRel, Ordering::Relaxed);
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let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::SeqCst, Ordering::Relaxed);
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let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::SeqCst, Ordering::Acquire);
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let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::SeqCst, Ordering::SeqCst);
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// AcqRel is always forbidden as a failure ordering
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let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::Relaxed, Ordering::AcqRel);
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let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::Acquire, Ordering::AcqRel);
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let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::Release, Ordering::AcqRel);
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let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::AcqRel, Ordering::AcqRel);
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let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::SeqCst, Ordering::AcqRel);
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// Release is always forbidden as a failure ordering
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let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Relaxed, Ordering::Release);
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let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Acquire, Ordering::Release);
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let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Release, Ordering::Release);
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let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::AcqRel, Ordering::Release);
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let _ = x.compare_exchange_weak(ptr, ptr2, 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_weak(ptr2, ptr, Ordering::Release, Ordering::Acquire);
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let _ = x.compare_exchange_weak(ptr2, ptr, 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_weak(ptr, ptr2, Ordering::Relaxed, Ordering::SeqCst);
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let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Relaxed, Ordering::Acquire);
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// Acquire/AcqRel forbids failure order of SeqCst
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let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::Acquire, Ordering::SeqCst);
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let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::AcqRel, Ordering::SeqCst);
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}
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