57 lines
1.7 KiB
Rust
57 lines
1.7 KiB
Rust
//@compile-flags: -Zmiri-disable-isolation -Zmir-opt-level=0 -Zmiri-disable-weak-memory-emulation -Zmiri-preemption-rate=0
|
|
|
|
// Note: mir-opt-level set to 0 to prevent the read of stack_var in thread 1
|
|
// from being optimized away and preventing the detection of the data-race.
|
|
|
|
use std::ptr::null_mut;
|
|
use std::sync::atomic::{AtomicPtr, Ordering};
|
|
use std::thread::{sleep, spawn};
|
|
use std::time::Duration;
|
|
|
|
#[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() {
|
|
// Shared atomic pointer
|
|
let pointer = AtomicPtr::new(null_mut::<usize>());
|
|
let ptr = EvilSend(&pointer as *const AtomicPtr<usize>);
|
|
|
|
// Note: this is scheduler-dependent
|
|
// the operations need to occur in
|
|
// order, otherwise the allocation is
|
|
// not visible to the other-thread to
|
|
// detect the race:
|
|
// 1. stack-allocate
|
|
// 2. atomic_store
|
|
// 3. atomic_load
|
|
// 4. write-value
|
|
// 5. read-value
|
|
unsafe {
|
|
let j1 = spawn(move || {
|
|
// Concurrent allocate the memory.
|
|
// Uses relaxed semantics to not generate
|
|
// a release sequence.
|
|
let pointer = &*ptr.0;
|
|
|
|
let mut stack_var = 0usize;
|
|
|
|
pointer.store(&mut stack_var as *mut _, Ordering::Release);
|
|
|
|
sleep(Duration::from_millis(200));
|
|
|
|
stack_var //~ ERROR: Data race detected between Read on thread `<unnamed>` and Write on thread `<unnamed>`
|
|
});
|
|
|
|
let j2 = spawn(move || {
|
|
let pointer = &*ptr.0;
|
|
*pointer.load(Ordering::Acquire) = 3;
|
|
});
|
|
|
|
j1.join().unwrap();
|
|
j2.join().unwrap();
|
|
}
|
|
}
|