54 lines
1.6 KiB
Rust
54 lines
1.6 KiB
Rust
// ignore-windows: Concurrency on Windows is not supported yet.
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// compile-flags: -Zmiri-disable-isolation
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use std::thread::{spawn, sleep};
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use std::ptr::null_mut;
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use std::sync::atomic::{Ordering, AtomicPtr};
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use std::time::Duration;
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#[derive(Copy, Clone)]
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struct EvilSend<T>(pub T);
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unsafe impl<T> Send for EvilSend<T> {}
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unsafe impl<T> Sync for EvilSend<T> {}
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pub fn main() {
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// Shared atomic pointer
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let pointer = AtomicPtr::new(null_mut::<usize>());
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let ptr = EvilSend(&pointer as *const AtomicPtr<usize>);
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// Note: this is scheduler-dependent
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// the operations need to occur in
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// order, otherwise the allocation is
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// not visible to the other-thread to
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// detect the race:
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// 1. stack-allocate
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// 2. read
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// 3. stack-deallocate
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unsafe {
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let j1 = spawn(move || {
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// Concurrent allocate the memory.
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// Uses relaxed semantics to not generate
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// a release sequence.
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let pointer = &*ptr.0;
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let mut stack_var = 0usize;
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pointer.store(&mut stack_var as *mut _, Ordering::Release);
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sleep(Duration::from_millis(1000));
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// NOTE: the race is also detected with thread 0, and so reported for thread 0 instead of 2, unsure of the cause.
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drop(stack_var);
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}); //~ ERROR Data race detected between DEALLOCATE on Thread(id = 1) and READ on Thread(id = 0, name = "main")
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let j2 = spawn(move || {
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let pointer = &*ptr.0;
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*pointer.load(Ordering::Acquire)
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});
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j1.join().unwrap();
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j2.join().unwrap();
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}
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}
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