1 //@compile-flags: -Zmiri-disable-weak-memory-emulation -Zmiri-preemption-rate=0
3 use std::sync::atomic::{AtomicUsize, Ordering};
4 use std::thread::spawn;
7 struct EvilSend<T>(pub T);
9 unsafe impl<T> Send for EvilSend<T> {}
10 unsafe impl<T> Sync for EvilSend<T> {}
12 static SYNC: AtomicUsize = AtomicUsize::new(0);
16 let b = &mut a as *mut u32;
19 // Note: this is scheduler-dependent
20 // the operations need to occur in
22 // 1. store release : 1
23 // 2. RMW relaxed : 1 -> 2
24 // 3. store relaxed : 3
25 // 4. load acquire : 3
27 let j1 = spawn(move || {
29 SYNC.store(1, Ordering::Release);
32 let j2 = spawn(move || {
33 if SYNC.swap(2, Ordering::Relaxed) == 1 {
34 // Blocks the acquire-release sequence
35 SYNC.store(3, Ordering::Relaxed);
39 let j3 = spawn(move || {
40 if SYNC.load(Ordering::Acquire) == 3 {
41 *c.0 //~ ERROR: Data race detected between Read on thread `<unnamed>` and Write on thread `<unnamed>`