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// Advanced Systems Programming: Lock-Free Queue in Rust use std::sync::atomic::{AtomicPtr, Ordering}; use std::ptr; pub struct LockFreeQueue<T> { head: AtomicPtr<Node<T>>, tail: AtomicPtr<Node<T>>, } struct Node<T> { data: Option<T>, next: AtomicPtr<Node<T>>, } impl<T> LockFreeQueue<T> { pub fn push(&self, value: T) { let new_node = Box::into_raw(Box::new(Node { data: Some(value), next: AtomicPtr::new(ptr::null_mut()), })); loop { let tail = self.tail.load(Ordering::Acquire); let next = unsafe { (*tail).next.load(Ordering::Acquire) }; if tail == self.tail.load(Ordering::Acquire) { if next.is_null() { // Attempt to link the new node at the end of the queue if unsafe { (*tail).next.compare_exchange_weak( next, new_node, Ordering::Release, Ordering::Relaxed ) }.is_ok() { let _ = self.tail.compare_exchange( tail, new_node, Ordering::Release, Ordering::Relaxed ); return; } } else { let _ = self.tail.compare_exchange( tail, next, Ordering::Release, Ordering::Relaxed ); } } } } }