02_ownership: add aliasing-xor-mutability example

content/lessons/02_ownership/aliasing-xor-mutability/Cargo.toml

@@ -0,0 +1,4 @@
+[package]
+name = "aliasing_xor_mutability"
+version = "0.1.0"
+edition = "2021"

content/lessons/02_ownership/aliasing-xor-mutability/src/main.rs

@@ -0,0 +1,39 @@
+fn next_int() -> i32 {
+    42
+}
+
+struct Data(i32);
+impl Data {
+    fn new() -> Self {
+        Self(0)
+    }
+
+    fn read(&self) -> i32 { self.0 }
+
+    fn write(&mut self, n: i32) { self.0 = n }
+}
+
+fn thread1(shared_data: &mut Data) {
+    loop {
+        shared_data.write(next_int());
+    }
+}
+
+fn thread2(shared_data: &Data) {
+    loop {
+        println!("{}", shared_data.read());
+    }
+}
+
+fn main() {
+    let mut shared_data = Data::new();
+
+    std::thread::scope(|s| {
+        let t1 = s.spawn(|| {
+            thread1(&mut shared_data);
+        });
+        let t2 = s.spawn(|| {
+            thread2(&shared_data);
+        });
+    });
+}