rust/tests/compile-fail/data_race/atomic_write_read_race_alt.rs
JCTyBlaidd 95c99b2044 Detect races between atomic and non-atomic accesses of a variable,
previously only data races between two non-atomic accesses were
 detected.
2020-11-04 21:35:48 +00:00

32 lines
774 B
Rust

// ignore-windows: Concurrency on Windows is not supported yet.
#![feature(core_intrinsics)]
use std::thread::spawn;
use std::sync::atomic::AtomicUsize;
use std::intrinsics::atomic_store;
#[derive(Copy, Clone)]
struct EvilSend<T>(pub T);
unsafe impl<T> Send for EvilSend<T> {}
unsafe impl<T> Sync for EvilSend<T> {}
pub fn main() {
let mut a = AtomicUsize::new(0);
let b = &mut a as *mut AtomicUsize;
let c = EvilSend(b);
unsafe {
let j1 = spawn(move || {
*(c.0 as *mut usize)
});
let j2 = spawn(move || {
//Equivalent to: (&*c.0).store(32, Ordering::SeqCst)
atomic_store(c.0 as *mut usize, 32); //~ ERROR Data race
});
j1.join().unwrap();
j2.join().unwrap();
}
}