Merge pull request #3071 from Ms2ger/workers-threads

Give workers their own ScriptChan and use it for postMessage; r=Manishearth

src/components/script/dom/dedicatedworkerglobalscope.rs

@@ -14,11 +14,11 @@ use dom::eventtarget::WorkerGlobalScopeTypeId;
 use dom::messageevent::MessageEvent;
 use dom::workerglobalscope::DedicatedGlobalScope;
 use dom::workerglobalscope::WorkerGlobalScope;
-use script_task::{ScriptTask, ScriptChan};
+use dom::xmlhttprequest::XMLHttpRequest;
+use script_task::{ScriptTask, ScriptChan, ScriptMsg, DOMMessage, XHRProgressMsg};
 use script_task::StackRootTLS;
 
 use servo_net::resource_task::{ResourceTask, load_whole_resource};
-use servo_util::str::DOMString;
 
 use js::rust::Cx;
 
@@ -30,13 +30,13 @@ use url::Url;
 #[deriving(Encodable)]
 pub struct DedicatedWorkerGlobalScope {
     workerglobalscope: WorkerGlobalScope,
-    receiver: Untraceable<Receiver<DOMString>>,
+    receiver: Untraceable<Receiver<ScriptMsg>>,
 }
 
 impl DedicatedWorkerGlobalScope {
     pub fn new_inherited(worker_url: Url,
                          cx: Rc<Cx>,
-                         receiver: Receiver<DOMString>,
+                         receiver: Receiver<ScriptMsg>,
                          resource_task: ResourceTask,
                          script_chan: ScriptChan)
                          -> DedicatedWorkerGlobalScope {
@@ -50,7 +50,7 @@ impl DedicatedWorkerGlobalScope {
 
     pub fn new(worker_url: Url,
                cx: Rc<Cx>,
-               receiver: Receiver<DOMString>,
+               receiver: Receiver<ScriptMsg>,
                resource_task: ResourceTask,
                script_chan: ScriptChan)
                -> Temporary<DedicatedWorkerGlobalScope> {
@@ -62,9 +62,9 @@ impl DedicatedWorkerGlobalScope {
 
 impl DedicatedWorkerGlobalScope {
     pub fn run_worker_scope(worker_url: Url,
-                            receiver: Receiver<DOMString>,
-                            resource_task: ResourceTask,
-                            script_chan: ScriptChan) {
+                            resource_task: ResourceTask) -> ScriptChan {
+        let (receiver, sender) = ScriptChan::new();
+        let sender_clone = sender.clone();
         TaskBuilder::new()
             .native()
             .named(format!("Web Worker at {}", worker_url.serialize()))
@@ -85,7 +85,7 @@ impl DedicatedWorkerGlobalScope {
             let (_js_runtime, js_context) = ScriptTask::new_rt_and_cx();
             let global = DedicatedWorkerGlobalScope::new(
                 worker_url, js_context.clone(), receiver, resource_task,
-                script_chan).root();
+                sender).root();
             match js_context.evaluate_script(
                 global.reflector().get_jsobject(), source, url.serialize(), 1) {
                 Ok(_) => (),
@@ -98,13 +98,18 @@ impl DedicatedWorkerGlobalScope {
                 EventTargetCast::from_ref(&*global);
             loop {
                 match global.receiver.recv_opt() {
-                    Ok(message) => {
+                    Ok(DOMMessage(message)) => {
                         MessageEvent::dispatch(target, &Worker(*scope), message)
                     },
+                    Ok(XHRProgressMsg(addr, progress)) => {
+                        XMLHttpRequest::handle_xhr_progress(addr, progress)
+                    },
+                    Ok(_) => fail!("Unexpected message"),
                     Err(_) => break,
                 }
             }
         });
+        return sender_clone;
     }
 }
 

src/components/script/dom/worker.rs

@@ -7,10 +7,10 @@ use dom::bindings::codegen::Bindings::WorkerBinding::WorkerMethods;
 use dom::bindings::error::{Fallible, Syntax};
 use dom::bindings::global::GlobalRef;
 use dom::bindings::js::{JSRef, Temporary};
-use dom::bindings::trace::Untraceable;
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
 use dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope;
 use dom::eventtarget::{EventTarget, WorkerTypeId};
+use script_task::{ScriptChan, DOMMessage};
 
 use servo_util::str::DOMString;
 use url::UrlParser;
@@ -18,18 +18,18 @@ use url::UrlParser;
 #[deriving(Encodable)]
 pub struct Worker {
     eventtarget: EventTarget,
-    sender: Untraceable<Sender<DOMString>>,
+    sender: ScriptChan,
 }
 
 impl Worker {
-    pub fn new_inherited(sender: Sender<DOMString>) -> Worker {
+    pub fn new_inherited(sender: ScriptChan) -> Worker {
         Worker {
             eventtarget: EventTarget::new_inherited(WorkerTypeId),
-            sender: Untraceable::new(sender),
+            sender: sender,
         }
     }
 
-    pub fn new(global: &GlobalRef, sender: Sender<DOMString>) -> Temporary<Worker> {
+    pub fn new(global: &GlobalRef, sender: ScriptChan) -> Temporary<Worker> {
         reflect_dom_object(box Worker::new_inherited(sender),
                            global,
                            WorkerBinding::Wrap)
@@ -44,17 +44,17 @@ impl Worker {
             Err(_) => return Err(Syntax),
         };
 
-        let (sender, receiver) = channel();
         let resource_task = global.resource_task();
-        DedicatedWorkerGlobalScope::run_worker_scope(
-            worker_url, receiver, resource_task, global.script_chan().clone());
+        let sender = DedicatedWorkerGlobalScope::run_worker_scope(
+            worker_url, resource_task);
         Ok(Worker::new(global, sender))
     }
 }
 
 impl<'a> WorkerMethods for JSRef<'a, Worker> {
     fn PostMessage(&self, message: DOMString) {
-        self.sender.send(message);
+        let ScriptChan(ref sender) = self.sender;
+        sender.send(DOMMessage(message));
     }
 }
 

src/components/script/script_task.rs

@@ -31,12 +31,6 @@ use layout_interface::ContentChangedDocumentDamage;
 use layout_interface;
 use page::{Page, IterablePage, Frame};
 
-use geom::point::Point2D;
-use js::jsapi::{JS_SetWrapObjectCallbacks, JS_SetGCZeal, JS_DEFAULT_ZEAL_FREQ, JS_GC};
-use js::jsapi::{JSContext, JSRuntime};
-use js::rust::{Cx, RtUtils};
-use js::rust::with_compartment;
-use js;
 use script_traits::{CompositorEvent, ResizeEvent, ReflowEvent, ClickEvent, MouseDownEvent};
 use script_traits::{MouseMoveEvent, MouseUpEvent, ConstellationControlMsg, ScriptTaskFactory};
 use script_traits::{ResizeMsg, AttachLayoutMsg, LoadMsg, SendEventMsg, ResizeInactiveMsg};
@@ -50,32 +44,48 @@ use servo_msg::constellation_msg;
 use servo_net::image_cache_task::ImageCacheTask;
 use servo_net::resource_task::ResourceTask;
 use servo_util::geometry::to_frac_px;
+use servo_util::str::DOMString;
 use servo_util::task::spawn_named_with_send_on_failure;
+
+use geom::point::Point2D;
+use js::jsapi::{JS_SetWrapObjectCallbacks, JS_SetGCZeal, JS_DEFAULT_ZEAL_FREQ, JS_GC};
+use js::jsapi::{JSContext, JSRuntime};
+use js::rust::{Cx, RtUtils};
+use js::rust::with_compartment;
+use js;
+use url::Url;
+
+use serialize::{Encoder, Encodable};
 use std::any::{Any, AnyRefExt};
 use std::cell::RefCell;
 use std::comm::{channel, Sender, Receiver, Select};
 use std::mem::replace;
 use std::rc::Rc;
-use url::Url;
-
-use serialize::{Encoder, Encodable};
 
 local_data_key!(pub StackRoots: *const RootCollection)
 
-/// Messages used to control the script task.
+/// Messages used to control script event loops, such as ScriptTask and
+/// DedicatedWorkerGlobalScope.
 pub enum ScriptMsg {
-    /// Acts on a fragment URL load on the specified pipeline.
+    /// Acts on a fragment URL load on the specified pipeline (only dispatched
+    /// to ScriptTask).
     TriggerFragmentMsg(PipelineId, Url),
-    /// Begins a content-initiated load on the specified pipeline.
+    /// Begins a content-initiated load on the specified pipeline (only
+    /// dispatched to ScriptTask).
     TriggerLoadMsg(PipelineId, Url),
-    /// Instructs the script task to send a navigate message to the constellation.
+    /// Instructs the script task to send a navigate message to
+    /// the constellation (only dispatched to ScriptTask).
     NavigateMsg(NavigationDirection),
-    /// Fires a JavaScript timeout.
+    /// Fires a JavaScript timeout (only dispatched to ScriptTask).
     FireTimerMsg(PipelineId, TimerId),
-    /// Notifies the script that a window associated with a particular pipeline should be closed.
+    /// Notifies the script that a window associated with a particular pipeline
+    /// should be closed (only dispatched to ScriptTask).
     ExitWindowMsg(PipelineId),
-    /// Notifies the script of progress on a fetch
-    XHRProgressMsg(TrustedXHRAddress, XHRProgress)
+    /// Notifies the script of progress on a fetch (dispatched to all tasks).
+    XHRProgressMsg(TrustedXHRAddress, XHRProgress),
+    /// Message sent through Worker.postMessage (only dispatched to
+    /// DedicatedWorkerGlobalScope).
+    DOMMessage(DOMString),
 }
 
 /// Encapsulates internal communication within the script task.
@@ -430,6 +440,7 @@ impl ScriptTask {
                 FromScript(ExitWindowMsg(id)) => self.handle_exit_window_msg(id),
                 FromConstellation(ResizeMsg(..)) => fail!("should have handled ResizeMsg already"),
                 FromScript(XHRProgressMsg(addr, progress)) => XMLHttpRequest::handle_xhr_progress(addr, progress),
+                FromScript(DOMMessage(..)) => fail!("unexpected message"),
             }
         }