41 lines
1005 B
Rust
41 lines
1005 B
Rust
//@compile-flags: -Zmiri-ignore-leaks
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// Tests operations not perfomable through C++'s atomic API
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// but doable in unsafe Rust which we think *should* be fine.
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// Nonetheless they may be determined as inconsistent with the
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// memory model in the future.
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#![feature(atomic_from_mut)]
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use std::sync::atomic::AtomicU32;
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use std::sync::atomic::Ordering::*;
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use std::thread::spawn;
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fn static_atomic(val: u32) -> &'static AtomicU32 {
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let ret = Box::leak(Box::new(AtomicU32::new(val)));
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ret
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}
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// We allow perfectly overlapping non-atomic and atomic reads to race
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fn racing_mixed_atomicity_read() {
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let x = static_atomic(0);
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x.store(42, Relaxed);
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let j1 = spawn(move || x.load(Relaxed));
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let j2 = spawn(move || {
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let x_ptr = x as *const AtomicU32 as *const u32;
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unsafe { x_ptr.read() }
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});
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let r1 = j1.join().unwrap();
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let r2 = j2.join().unwrap();
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assert_eq!(r1, 42);
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assert_eq!(r2, 42);
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}
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pub fn main() {
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racing_mixed_atomicity_read();
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}
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