Complete first release candidate audit (#107)

crates/libremetaverse/src/asset_manager.rs

@@ -108,7 +108,7 @@ mod event_slot_tests {
         let delivered_handler = Arc::clone(&delivered);
         let releasing = Arc::clone(&released);
         let healthy = slot.subscribe(Arc::new(move |value| {
-            let _keep_alive = &releasing;
+            std::hint::black_box(&releasing);
             delivered_handler.fetch_add(value as u64, Ordering::AcqRel);
         }));
         drop(released);
@@ -1046,6 +1046,20 @@ impl AssetManager {
         Ok(())
     }
 
+    pub(crate) fn native_image_transfer_count(&self) -> i32 {
+        i32::try_from(mutex(&self.inner.image_cancellations).len()).unwrap_or(i32::MAX)
+    }
+
+    pub(crate) fn native_cancel_image_requests(&self) {
+        let requests = mutex(&self.inner.image_cancellations)
+            .drain()
+            .map(|(_, source)| source)
+            .collect::<Vec<_>>();
+        for source in requests {
+            source.cancel();
+        }
+    }
+
     pub async fn request_server_baked_image(
         &self,
         avatar_id: UUID,