emk · December 15, 2014 23:00 · Dec 15, 2014
diff --git a/multithreaded-traits.rs b/multithreaded-traits.rs
@@ -0,0 +1,39 @@
+use std::sync::Arc;
+use std::sync::RWLock;
+use std::task::spawn;
+
+trait Common : Sized + Send + Sync {
+    fn munge(&mut self);
+}
+
+#[deriving(Show)]
+struct Foo { i: int }
+impl Common for Foo {
+    fn munge(&mut self) {
+        self.i += 1;
+        println!("Munging a Foo: {}", self.i);
+    }
+}
+
+#[deriving(Show)]
+struct Bar { j: int }
+impl Common for Bar {
+    fn munge(&mut self) {
+        self.j += 1;
+        println!("Munging a Bar: {}", self.j);
+    }
+}
+
+fn main() {
+    let box1 = Arc::new(RWLock::<Box<Common>>::new(box Foo{i: 0}));
+    let box2 = Arc::new(RWLock::<Box<Common>>::new(box Bar{j: 0}));
+    for _ in range(0i, 2) {
+        // Make new handles for our boxes and pass them to a thread.
+        let boxes = vec!(box1.clone(), box2.clone());
+        spawn(proc() {
+            for b in boxes.iter() {
+                b.write().munge();
+            }
+        });
+    }
+}
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