25 lines
916 B
Rust
25 lines
916 B
Rust
// We want to control preemption here.
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//@compile-flags: -Zmiri-disable-isolation -Zmiri-preemption-rate=0
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use std::sync::atomic::{fence, AtomicUsize, Ordering};
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use std::sync::Arc;
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use std::thread;
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use std::time::Duration;
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fn main() {
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static mut V: u32 = 0;
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let a = Arc::new(AtomicUsize::default());
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let b = a.clone();
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thread::spawn(move || {
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unsafe { V = 1 }
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b.store(1, Ordering::SeqCst);
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});
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thread::sleep(Duration::from_millis(100));
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fence(Ordering::SeqCst);
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// Imagine the other thread's actions happening here.
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assert_eq!(a.load(Ordering::Relaxed), 1);
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// The fence is useless, since it did not happen-after the `store` in the other thread.
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// Hence this is a data race.
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// Also see https://github.com/rust-lang/miri/issues/2192.
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unsafe { V = 2 } //~ERROR: Data race detected between Write on thread `main` and Write on thread `<unnamed>`
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}
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