rust/tests/fail/data_race/release_seq_race_same_thread.rs
2022-06-01 10:53:38 -04:00

51 lines
1.4 KiB
Rust

// ignore-windows: Concurrency on Windows is not supported yet.
// compile-flags: -Zmiri-disable-isolation
use std::thread::spawn;
use std::sync::atomic::{AtomicUsize, Ordering};
#[derive(Copy, Clone)]
struct EvilSend<T>(pub T);
unsafe impl<T> Send for EvilSend<T> {}
unsafe impl<T> Sync for EvilSend<T> {}
static SYNC: AtomicUsize = AtomicUsize::new(0);
pub fn main() {
let mut a = 0u32;
let b = &mut a as *mut u32;
let c = EvilSend(b);
// Note: this is scheduler-dependent
// the operations need to occur in
// order, the sleep operations currently
// force the desired ordering:
// 1. store release : 1
// 2. store relaxed : 2
// 3. load acquire : 2
unsafe {
let j1 = spawn(move || {
*c.0 = 1;
SYNC.store(1, Ordering::Release);
// C++20 update to release sequences
// makes this block the release sequence
// despite the being on the same thread
// as the release store.
SYNC.store(2, Ordering::Relaxed);
});
let j2 = spawn(move || {
if SYNC.load(Ordering::Acquire) == 2 {
*c.0 //~ ERROR Data race detected between Read on Thread(id = 2) and Write on Thread(id = 1)
} else {
0
}
});
j1.join().unwrap();
j2.join().unwrap();
}
}