Run all task spawning through util, to allow for easy hooking.

During debugging, I found it useful to hook all task creation in a
central location, and util::task was the perfect place for it.

r? @pcwalton (or maybe someone else, I'm kinda sending you a bunch of
reviews today because I don't know who better to give them to)

Cargo.lock

@@ -46,6 +46,7 @@ version = "0.0.1"
 dependencies = [
  "azure 0.1.0 (git+https://github.com/servo/rust-azure#e151fa23f5cb3c1ef62b4d41bad9abdd1f4f3471)",
  "geom 0.1.0 (git+https://github.com/servo/rust-geom#b001a76e907befaae1d0d6dd259418a22092da86)",
+ "util 0.0.1",
 ]
 
 [[package]]
@@ -112,6 +113,7 @@ version = "0.0.1"
 dependencies = [
  "devtools_traits 0.0.1",
  "msg 0.0.1",
+ "util 0.0.1",
 ]
 
 [[package]]

components/canvas/Cargo.toml

@@ -12,3 +12,6 @@ git = "https://github.com/servo/rust-azure"
 
 [dependencies.geom]
 git = "https://github.com/servo/rust-geom"
+
+[dependencies.util]
+path = "../util"

components/canvas/canvas_render_task.rs

@@ -6,9 +6,9 @@ use azure::azure_hl::{DrawTarget, Color, B8G8R8A8, SkiaBackend, StrokeOptions, D
 use azure::azure_hl::{ColorPattern, ColorPatternRef};
 use geom::rect::Rect;
 use geom::size::Size2D;
+use servo_util::task::spawn_named;
 
 use std::comm;
-use std::task::TaskBuilder;
 
 pub enum CanvasMsg {
     FillRect(Rect<f32>),
@@ -37,8 +37,7 @@ impl CanvasRenderTask {
 
     pub fn start(size: Size2D<i32>) -> Sender<CanvasMsg> {
         let (chan, port) = comm::channel::<CanvasMsg>();
-        let builder = TaskBuilder::new().named("CanvasTask");
-        builder.spawn(proc() {
+        spawn_named("CanvasTask", proc() {
             let mut renderer = CanvasRenderTask::new(size);
 
             loop {

components/canvas/lib.rs

@@ -6,5 +6,6 @@
 
 extern crate azure;
 extern crate geom;
+extern crate "util" as servo_util;
 
 pub mod canvas_render_task;

components/devtools/Cargo.toml

@@ -12,3 +12,6 @@ path = "../devtools_traits"
 
 [dependencies.msg]
 path = "../msg"
+
+[dependencies.util]
+path = "../util"

components/devtools/lib.rs

@@ -27,6 +27,7 @@ extern crate debug;
 extern crate serialize;
 extern crate sync;
 extern crate "msg" as servo_msg;
+extern crate "util" as servo_util;
 
 use actor::{Actor, ActorRegistry};
 use actors::console::ConsoleActor;
@@ -37,6 +38,7 @@ use protocol::JsonPacketSender;
 
 use devtools_traits::{ServerExitMsg, DevtoolsControlMsg, NewGlobal, DevtoolScriptControlMsg};
 use servo_msg::constellation_msg::PipelineId;
+use servo_util::task::spawn_named;
 
 use std::cell::RefCell;
 use std::comm;
@@ -44,7 +46,6 @@ use std::comm::{Disconnected, Empty};
 use std::io::{TcpListener, TcpStream};
 use std::io::{Acceptor, Listener, EndOfFile, TimedOut};
 use std::num;
-use std::task::TaskBuilder;
 use serialize::json;
 use sync::{Arc, Mutex};
 
@@ -61,7 +62,7 @@ mod protocol;
 /// Spin up a devtools server that listens for connections on the specified port.
 pub fn start_server(port: u16) -> Sender<DevtoolsControlMsg> {
     let (sender, receiver) = comm::channel();
-    TaskBuilder::new().named("devtools").spawn(proc() {
+    spawn_named("devtools", proc() {
         run_server(receiver, port)
     });
     sender
@@ -193,7 +194,7 @@ fn run_server(receiver: Receiver<DevtoolsControlMsg>, port: u16) {
             Err(_e) => { /* connection failed */ }
             Ok(stream) => {
                 let actors = actors.clone();
-                spawn(proc() {
+                spawn_named("devtools-client-handler", proc() {
                     // connection succeeded
                     handle_client(actors, stream.clone())
                 })

components/gfx/font_cache_task.rs

@@ -13,6 +13,7 @@ use sync::Arc;
 use font_template::{FontTemplate, FontTemplateDescriptor};
 use platform::font_template::FontTemplateData;
 use servo_net::resource_task::{ResourceTask, load_whole_resource};
+use servo_util::task::spawn_named;
 use style::{Source, LocalSource, UrlSource_};
 
 /// A list of font templates that make up a given font family.
@@ -245,7 +246,7 @@ impl FontCacheTask {
     pub fn new(resource_task: ResourceTask) -> FontCacheTask {
         let (chan, port) = channel();
 
-        spawn(proc() {
+        spawn_named("font-cache-task", proc() {
             // TODO: Allow users to specify these.
             let mut generic_fonts = HashMap::with_capacity(5);
             add_generic_font(&mut generic_fonts, "serif", "Times New Roman");

components/net/image_cache_task.rs

@@ -6,11 +6,11 @@ use image::base::{Image, load_from_memory};
 use resource_task;
 use resource_task::{LoadData, ResourceTask};
 
+use servo_util::task::spawn_named;
 use servo_util::taskpool::TaskPool;
 use std::comm::{channel, Receiver, Sender};
 use std::collections::hashmap::HashMap;
 use std::mem::replace;
-use std::task::spawn;
 use std::result;
 use sync::{Arc, Mutex};
 use serialize::{Encoder, Encodable};
@@ -84,7 +84,7 @@ impl ImageCacheTask {
         let (chan, port) = channel();
         let chan_clone = chan.clone();
 
-        spawn(proc() {
+        spawn_named("image-cache-task", proc() {
             let mut cache = ImageCache {
                 resource_task: resource_task,
                 port: port,
@@ -105,7 +105,7 @@ impl ImageCacheTask {
     pub fn new_sync(resource_task: ResourceTask, task_pool: TaskPool) -> ImageCacheTask {
         let (chan, port) = channel();
 
-        spawn(proc() {
+        spawn_named("image-cache-task-sync", proc() {
             let inner_cache = ImageCacheTask::new(resource_task, task_pool);
 
             loop {
@@ -248,7 +248,7 @@ impl ImageCache {
                 let resource_task = self.resource_task.clone();
                 let url_clone = url.clone();
 
-                spawn(proc() {
+                spawn_named("image-cache-task-prefetch", proc() {
                     let url = url_clone;
                     debug!("image_cache_task: started fetch for {:s}", url.serialize());
 
@@ -463,7 +463,7 @@ fn load_image_data(url: Url, resource_task: ResourceTask) -> Result<Vec<u8>, ()>
 pub fn spawn_listener<A: Send>(f: proc(Receiver<A>):Send) -> Sender<A> {
     let (setup_chan, setup_port) = channel();
 
-    spawn(proc() {
+    spawn_named("image-cache-task-listener", proc() {
         let (chan, port) = channel();
         setup_chan.send(chan);
         f(port);

components/net/resource_task.rs

@@ -10,7 +10,6 @@ use file_loader;
 use http_loader;
 
 use std::comm::{channel, Receiver, Sender};
-use std::task::TaskBuilder;
 use http::headers::content_type::MediaType;
 use http::headers::response::HeaderCollection as ResponseHeaderCollection;
 use http::headers::request::HeaderCollection as RequestHeaderCollection;
@@ -20,6 +19,7 @@ use url::Url;
 use http::status::Ok as StatusOk;
 use http::status::Status;
 
+use servo_util::task::spawn_named;
 
 pub enum ControlMsg {
     /// Request the data associated with a particular URL
@@ -166,8 +166,7 @@ pub type ResourceTask = Sender<ControlMsg>;
 /// Create a ResourceTask
 pub fn new_resource_task(user_agent: Option<String>) -> ResourceTask {
     let (setup_chan, setup_port) = channel();
-    let builder = TaskBuilder::new().named("ResourceManager");
-    builder.spawn(proc() {
+    spawn_named("ResourceManager", proc() {
         ResourceManager::new(setup_port, user_agent).start();
     });
     setup_chan

components/script/dom/dedicatedworkerglobalscope.rs

@@ -24,6 +24,7 @@ use script_task::WorkerPostMessage;
 use script_task::StackRootTLS;
 
 use servo_net::resource_task::{ResourceTask, load_whole_resource};
+use servo_util::task::spawn_named_native;
 use servo_util::task_state;
 use servo_util::task_state::{Script, InWorker};
 
@@ -34,8 +35,6 @@ use js::rust::Cx;
 
 use std::rc::Rc;
 use std::ptr;
-use std::task::TaskBuilder;
-use native::task::NativeTaskBuilder;
 use url::Url;
 
 #[dom_struct]
@@ -88,10 +87,7 @@ impl DedicatedWorkerGlobalScope {
                             parent_sender: ScriptChan,
                             own_sender: ScriptChan,
                             receiver: Receiver<ScriptMsg>) {
-        TaskBuilder::new()
-            .native()
-            .named(format!("Web Worker at {}", worker_url.serialize()))
-            .spawn(proc() {
+        spawn_named_native(format!("Web worker for {}", worker_url.serialize()), proc() {
 
             task_state::initialize(Script | InWorker);
 

components/script/dom/xmlhttprequest.rs

@@ -57,7 +57,6 @@ use std::default::Default;
 use std::io::{BufReader, MemWriter, Timer};
 use std::from_str::FromStr;
 use std::path::BytesContainer;
-use std::task::TaskBuilder;
 use std::time::duration::Duration;
 use std::num::Zero;
 use time;
@@ -549,10 +548,9 @@ impl<'a> XMLHttpRequestMethods for JSRef<'a, XMLHttpRequest> {
             return XMLHttpRequest::fetch(&mut Sync(self), resource_task, load_data,
                                          terminate_receiver, cors_request);
         } else {
-            let builder = TaskBuilder::new().named("XHRTask");
             self.fetch_time.set(time::now().to_timespec().sec);
             let script_chan = global.root_ref().script_chan().clone();
-            builder.spawn(proc() {
+            spawn_named("XHRTask", proc() {
                 let _ = XMLHttpRequest::fetch(&mut Async(addr.unwrap(), script_chan),
                                               resource_task, load_data, terminate_receiver, cors_request);
             });

components/util/task.rs

@@ -15,6 +15,11 @@ pub fn spawn_named<S: IntoMaybeOwned<'static>>(name: S, f: proc():Send) {
     builder.spawn(f);
 }
 
+pub fn spawn_named_native<S: IntoMaybeOwned<'static>>(name: S, f: proc():Send) {
+    let builder = task::TaskBuilder::new().named(name).native();
+    builder.spawn(f);
+}
+
 /// Arrange to send a particular message to a channel if the task fails.
 pub fn spawn_named_with_send_on_failure<T: Send>(name: &'static str,
                                                  state: task_state::TaskState,

components/util/taskpool.rs

@@ -15,6 +15,7 @@
 // The only difference is that a normal channel is used instead of a sync_channel.
 //
 
+use task::spawn_named;
 use std::sync::{Arc, Mutex};
 
 pub struct TaskPool {
@@ -28,9 +29,11 @@ impl TaskPool {
 
         let state = Arc::new(Mutex::new(rx));
 
-        for _ in range(0, tasks) {
+        for i in range(0, tasks) {
             let state = state.clone();
-            spawn(proc() worker(&*state));
+            spawn_named(
+                format!("TaskPoolWorker {}/{}", i+1, tasks),
+                proc() worker(&*state));
         }
 
         return TaskPool { tx: tx };
@@ -50,4 +53,3 @@ impl TaskPool {
         self.tx.send(job);
     }
 }
-

components/util/workqueue.rs

@@ -7,16 +7,15 @@
 //! Data associated with queues is simply a pair of unsigned integers. It is expected that a
 //! higher-level API on top of this could allow safe fork-join parallelism.
 
+use task::spawn_named_native;
 use task_state;
 
-use native::task::NativeTaskBuilder;
+use libc::funcs::posix88::unistd::usleep;
 use rand::{Rng, XorShiftRng};
 use std::mem;
 use std::rand::weak_rng;
 use std::sync::atomics::{AtomicUint, SeqCst};
 use std::sync::deque::{Abort, BufferPool, Data, Empty, Stealer, Worker};
-use std::task::TaskBuilder;
-use libc::funcs::posix88::unistd::usleep;
 
 /// A unit of work.
 ///
@@ -247,8 +246,11 @@ impl<QueueData: Send, WorkData: Send> WorkQueue<QueueData, WorkData> {
         }
 
         // Spawn threads.
-        for thread in threads.into_iter() {
-            TaskBuilder::new().named(task_name).native().spawn(proc() {
+        for (i, thread) in threads.into_iter().enumerate() {
+
+            spawn_named_native(
+                format!("{} worker {}/{}", task_name, i+1, thread_count),
+                proc() {
                     task_state::initialize(state | task_state::InWorker);
                     let mut thread = thread;
                     thread.start()