51 lines
1.6 KiB
Rust
51 lines
1.6 KiB
Rust
// ignore-windows: Concurrency on Windows is not supported yet.
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// compile-flags: -Zmiri-disable-weak-memory-emulation -Zmiri-preemption-rate=0
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#![feature(new_uninit)]
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use std::thread::spawn;
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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::mem::MaybeUninit;
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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::<MaybeUninit<usize>>());
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let ptr = EvilSend(&pointer as *const AtomicPtr<MaybeUninit<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. alloc
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// 2. write
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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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pointer.store(Box::into_raw(Box::new_uninit()), Ordering::Relaxed);
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});
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let j2 = spawn(move || {
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let pointer = &*ptr.0;
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// Note: could also error due to reading uninitialized memory, but the data-race detector triggers first.
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*pointer.load(Ordering::Relaxed) //~ ERROR Data race detected between Read on Thread(id = 2) and Allocate on Thread(id = 1)
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});
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j1.join().unwrap();
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j2.join().unwrap();
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// Clean up memory, will never be executed
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drop(Box::from_raw(pointer.load(Ordering::Relaxed)));
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}
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}
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