Cargoify servo

components/util/task.rs

@@ -0,0 +1,40 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use std::str::IntoMaybeOwned;
+use std::task;
+use std::comm::Sender;
+use std::task::TaskBuilder;
+use native::task::NativeTaskBuilder;
+
+pub fn spawn_named<S: IntoMaybeOwned<'static>>(name: S, f: proc():Send) {
+    let builder = task::TaskBuilder::new().named(name);
+    builder.spawn(f);
+}
+
+/// Arrange to send a particular message to a channel if the task built by
+/// this `TaskBuilder` fails.
+pub fn spawn_named_with_send_on_failure<T: Send>(name: &'static str,
+                                                 f: proc(): Send,
+                                                 msg: T,
+                                                 dest: Sender<T>,
+                                                 native: bool) {
+    let future_result = if native {
+        TaskBuilder::new().named(name).native().try_future(f)
+    } else {
+        TaskBuilder::new().named(name).try_future(f)
+    };
+
+    let watched_name = name.to_string();
+    let watcher_name = format!("{:s}Watcher", watched_name);
+    TaskBuilder::new().named(watcher_name).spawn(proc() {
+        match future_result.unwrap() {
+            Ok(()) => (),
+            Err(..) => {
+                debug!("{:s} failed, notifying constellation", name);
+                dest.send(msg);
+            }
+        }
+    });
+}