1 files changed, 21 insertions, 0 deletions
diff --git a/components/constellation/event_loop.rs b/components/constellation/event_loop.rs
index 362960eba64..46542e7212f 100644
--- a/components/constellation/event_loop.rs
+++ b/components/constellation/event_loop.rs
@@ -6,17 +6,36 @@
 //! view of a script thread. When an `EventLoop` is dropped, an `ExitScriptThread`
 //! message is sent to the script thread, asking it to shut down.
 
+use std::hash::Hash;
 use std::marker::PhantomData;
 use std::rc::Rc;
+use std::sync::atomic::{AtomicUsize, Ordering};
 
 use ipc_channel::Error;
 use ipc_channel::ipc::IpcSender;
 use script_traits::ScriptThreadMessage;
 
+static CURRENT_EVENT_LOOP_ID: AtomicUsize = AtomicUsize::new(0);
+
 /// <https://html.spec.whatwg.org/multipage/#event-loop>
 pub struct EventLoop {
     script_chan: IpcSender<ScriptThreadMessage>,
     dont_send_or_sync: PhantomData<Rc<()>>,
+    id: usize,
+}
+
+impl PartialEq for EventLoop {
+    fn eq(&self, other: &Self) -> bool {
+        self.id == other.id
+    }
+}
+
+impl Eq for EventLoop {}
+
+impl Hash for EventLoop {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.id.hash(state);
+    }
 }
 
 impl Drop for EventLoop {
@@ -28,9 +47,11 @@ impl Drop for EventLoop {
 impl EventLoop {
     /// Create a new event loop from the channel to its script thread.
     pub fn new(script_chan: IpcSender<ScriptThreadMessage>) -> Rc<EventLoop> {
+        let id = CURRENT_EVENT_LOOP_ID.fetch_add(1, Ordering::Relaxed);
         Rc::new(EventLoop {
             script_chan,
             dont_send_or_sync: PhantomData,
+            id,
         })
     }