deactive profiler when not in use; use newtype structs for task chans

src/components/gfx/render_task.rs

@@ -59,19 +59,12 @@ pub fn BufferRequest(screen_rect: Rect<uint>, page_rect: Rect<f32>) -> BufferReq
 }
 
 #[deriving(Clone)]
-pub struct RenderChan<T> {
-    chan: SharedChan<Msg<T>>,
-}
-
+pub struct RenderChan<T>{chan:SharedChan<Msg<T>>}
 impl<T> RenderChan<T> {
     pub fn new(chan: Chan<Msg<T>>) -> RenderChan<T> {
-        RenderChan {
-            chan: SharedChan::new(chan),
-        }
-    }
-    pub fn send(&self, msg: Msg<T>) {
-        self.chan.send(msg);
+        RenderChan{chan:SharedChan::new(chan)}
     }
+    pub fn send(&self, msg: Msg<T>) { self.chan.send(msg) }
 }
 
 struct RenderTask<C,T> {

src/components/main/servo.rc

@@ -47,7 +47,7 @@ use gfx::opts;
 
 use servo_net::image_cache_task::ImageCacheTask;
 use servo_net::resource_task::ResourceTask;
-use servo_util::time::{Profiler, ProfilerChan, PrintMsg};
+use servo_util::time::{Profiler, ProfilerChan};
 
 pub use gfx::opts::Opts;
 pub use gfx::text;
@@ -56,7 +56,7 @@ use std::comm;
 #[cfg(not(test))]
 use std::os;
 use std::rt::rtio::RtioTimer;
-use std::rt::io::timer::Timer;
+use std::task::spawn_with;
 
 #[path="compositing/mod.rs"]
 pub mod compositing;
@@ -127,38 +127,19 @@ fn start(argc: int, argv: **u8, crate_map: *u8) -> int {
 
 fn run(opts: Opts) {
     let (shutdown_port, shutdown_chan) = comm::stream();
-    let (profiler_port, profiler_chan) = comm::stream();
-    let (compositor_port, compositor_chan) = comm::stream();
+    let (profiler_port, profiler_chan) = special_stream!(ProfilerChan);
+    let (compositor_port, compositor_chan) = special_stream!(CompositorChan);
 
-    let profiler_chan = ProfilerChan::new(profiler_chan);
-    Profiler::create(profiler_port);
-    do opts.profiler_period.map |&period| {
-        let profiler_chan = profiler_chan.clone();
-        let period = (period * 1000f) as u64;
-        do spawn {
-            let mut tm = Timer::new().unwrap();
-            loop {
-                tm.sleep(period);
-                profiler_chan.send(PrintMsg);
-            }
-        }
-    };
-    let compositor_chan = CompositorChan::new(compositor_chan);
-    let profiler_chan_clone = profiler_chan.clone();
+    Profiler::create(profiler_port, profiler_chan.clone(), opts.profiler_period);
 
-    let opts_clone = opts.clone();
-
-    do spawn {
-        let profiler_chan = profiler_chan_clone.clone();
-        let compositor_chan = compositor_chan.clone();
-
-        let opts = &opts_clone.clone();
+    do spawn_with((profiler_chan.clone(), compositor_chan, opts.clone()))
+        |(profiler_chan, compositor_chan, opts)| {
 
+        let opts = &opts;
         // Create a Servo instance.
-
         let resource_task = ResourceTask();
         let image_cache_task = ImageCacheTask(resource_task.clone());
-        let constellation_chan = Constellation::start(compositor_chan.clone(),
+        let constellation_chan = Constellation::start(compositor_chan,
                                                       opts,
                                                       resource_task,
                                                       image_cache_task,

src/components/msg/constellation_msg.rs

@@ -12,18 +12,10 @@ use geom::size::Size2D;
 use geom::rect::Rect;
 
 #[deriving(Clone)]
-pub struct ConstellationChan {
-    chan: SharedChan<Msg>,
-}
-
+pub struct ConstellationChan(SharedChan<Msg>);
 impl ConstellationChan {
     pub fn new(chan: Chan<Msg>) -> ConstellationChan {
-        ConstellationChan {
-            chan: SharedChan::new(chan),
-        }
-    }
-    pub fn send(&self, msg: Msg) {
-        self.chan.send(msg);
+        ConstellationChan(SharedChan::new(chan))
     }
 }
 

src/components/script/dom/window.rs

@@ -30,6 +30,7 @@ use std::int;
 use std::libc;
 use std::rt::rtio::RtioTimer;
 use std::rt::io::timer::Timer;
+use std::task::spawn_with;
 use js::jsapi::JSVal;
 
 pub enum TimerControlMsg {
@@ -198,21 +199,20 @@ impl Window {
                compositor: @ScriptListener,
                image_cache_task: ImageCacheTask)
                -> @mut Window {
-        let script_chan_clone = script_chan.clone();
         let win = @mut Window {
             page: page,
-            script_chan: script_chan,
+            script_chan: script_chan.clone(),
             compositor: compositor,
             wrapper: WrapperCache::new(),
             timer_chan: {
                 let (timer_port, timer_chan) = comm::stream::<TimerControlMsg>();
                 let id = page.id.clone();
-                do spawn {
+                do spawn_with(script_chan) |script_chan| {
                     loop {
                         match timer_port.recv() {
                             TimerMessage_Close => break,
-                            TimerMessage_Fire(td) => script_chan_clone.chan.send(FireTimerMsg(id, td)),
-                            TimerMessage_TriggerExit => script_chan_clone.chan.send(ExitMsg),
+                            TimerMessage_Fire(td) => script_chan.send(FireTimerMsg(id, td)),
+                            TimerMessage_TriggerExit => script_chan.send(ExitMsg),
                         }
                     }
                 }

src/components/script/layout_interface.rs

@@ -111,17 +111,9 @@ pub struct Reflow {
 
 /// Encapsulates a channel to the layout task.
 #[deriving(Clone)]
-pub struct LayoutChan {
-    chan: SharedChan<Msg>,
-}
-
+pub struct LayoutChan(SharedChan<Msg>);
 impl LayoutChan {
     pub fn new(chan: Chan<Msg>) -> LayoutChan {
-        LayoutChan {
-            chan: SharedChan::new(chan),
-        }
-    }
-    pub fn send(&self, msg: Msg) {
-        self.chan.send(msg);
+        LayoutChan(SharedChan::new(chan))
     }
 }

src/components/script/script_task.rs

@@ -83,20 +83,11 @@ pub struct NewLayoutInfo {
 
 /// Encapsulates external communication with the script task.
 #[deriving(Clone)]
-pub struct ScriptChan {
-    /// The channel used to send messages to the script task.
-    chan: SharedChan<ScriptMsg>,
-}
-
+pub struct ScriptChan(SharedChan<ScriptMsg>);
 impl ScriptChan {
     /// Creates a new script chan.
     pub fn new(chan: Chan<ScriptMsg>) -> ScriptChan {
-        ScriptChan {
-            chan: SharedChan::new(chan)
-        }
-    }
-    pub fn send(&self, msg: ScriptMsg) {
-        self.chan.send(msg);
+        ScriptChan(SharedChan::new(chan))
     }
 }
 

src/components/util/time.rs

@@ -3,27 +3,21 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 // Timing functions.
-use extra::time::precise_time_ns;
-use std::cell::Cell;
 use std::comm::{Port, SharedChan};
-use extra::sort::tim_sort;
 use std::iterator::AdditiveIterator;
+use std::rt::io::timer::Timer;
+use std::task::spawn_with;
+
+use extra::sort::tim_sort;
+use extra::time::precise_time_ns;
 use extra::treemap::TreeMap;
 
 // front-end representation of the profiler used to communicate with the profiler
 #[deriving(Clone)]
-pub struct ProfilerChan {
-    chan: SharedChan<ProfilerMsg>,
-}
-
+pub struct ProfilerChan(SharedChan<ProfilerMsg>);
 impl ProfilerChan {
     pub fn new(chan: Chan<ProfilerMsg>) -> ProfilerChan {
-        ProfilerChan {
-            chan: SharedChan::new(chan),
-        }
-    }
-    pub fn send(&self, msg: ProfilerMsg) {
-        self.chan.send(msg);
+        ProfilerChan(SharedChan::new(chan))
     }
 }
 
@@ -101,11 +95,31 @@ pub struct Profiler {
 }
 
 impl Profiler {
-    pub fn create(port: Port<ProfilerMsg>) {
-        let port = Cell::new(port);
-        do spawn {
-            let mut profiler = Profiler::new(port.take());
-            profiler.start();
+    pub fn create(port: Port<ProfilerMsg>, chan: ProfilerChan, period: Option<float>) {
+        match period {
+            Some(period) => {
+                let period = (period * 1000f) as u64;
+                do spawn {
+                    let mut timer = Timer::new().unwrap();
+                    loop {
+                        timer.sleep(period);
+                        if !chan.try_send(PrintMsg) {
+                            break;
+                        }
+                    }
+                }
+                // Spawn the profiler
+                do spawn_with(port) |port| {
+                    let mut profiler = Profiler::new(port);
+                    profiler.start();
+                }
+            }
+            None => {
+                // no-op to handle profiler messages when the profiler is inactive
+                do spawn_with(port) |port| {
+                    while port.try_recv().is_some() {}
+                }
+            }
         }
     }