50 lines
1.4 KiB
Rust
50 lines
1.4 KiB
Rust
//@compile-flags: -Zmiri-disable-isolation -Zmiri-disable-weak-memory-emulation -Zmiri-preemption-rate=0
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use std::sync::atomic::{AtomicUsize, Ordering};
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use std::thread::spawn;
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#[derive(Copy, Clone)]
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struct EvilSend<T>(pub T);
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unsafe impl<T> Send for EvilSend<T> {}
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unsafe impl<T> Sync for EvilSend<T> {}
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static SYNC: AtomicUsize = AtomicUsize::new(0);
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pub fn main() {
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let mut a = 0u32;
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let b = &mut a as *mut u32;
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let c = EvilSend(b);
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// Note: this is scheduler-dependent
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// the operations need to occur in
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// order, the sleep operations currently
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// force the desired ordering:
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// 1. store release : 1
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// 2. store relaxed : 2
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// 3. load acquire : 2
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unsafe {
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let j1 = spawn(move || {
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*c.0 = 1;
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SYNC.store(1, Ordering::Release);
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// C++20 update to release sequences
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// makes this block the release sequence
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// despite the being on the same thread
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// as the release store.
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SYNC.store(2, Ordering::Relaxed);
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});
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let j2 = spawn(move || {
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if SYNC.load(Ordering::Acquire) == 2 {
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*c.0 //~ ERROR: Data race detected between Read on thread `<unnamed>` and Write on thread `<unnamed>`
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} else {
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0
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}
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});
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j1.join().unwrap();
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j2.join().unwrap();
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}
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}
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