Remove `EventLoopWaker` from Constellation (#30101)

* remove event_loop_waker that is always None

* remove None event_loop_waker form InitialScriptState

* fix formatting

* remove None event_loop_waker from ScriptThread

* remove None EventLoopWaker from Window

* remove None and use of wake_after_send in webgl code

7 files changed, 15 insertions, 78 deletions

diff --git a/components/constellation/constellation.rs b/components/constellation/constellation.rs
index cf4ca3eb41b..0eb88c42761 100644
--- a/components/constellation/constellation.rs
+++ b/components/constellation/constellation.rs
@@ -115,7 +115,7 @@ use devtools_traits::{
     ChromeToDevtoolsControlMsg, DevtoolsControlMsg, DevtoolsPageInfo, NavigationState,
     ScriptToDevtoolsControlMsg,
 };
-use embedder_traits::{Cursor, EmbedderMsg, EmbedderProxy, EventLoopWaker};
+use embedder_traits::{Cursor, EmbedderMsg, EmbedderProxy};
 use embedder_traits::{MediaSessionEvent, MediaSessionPlaybackState};
 use euclid::{default::Size2D as UntypedSize2D, Size2D};
 use gfx::font_cache_thread::FontCacheThread;
@@ -504,9 +504,6 @@ pub struct Constellation<Message, LTF, STF, SWF> {
     /// Application window's GL Context for Media player
     player_context: WindowGLContext,
 
-    /// Mechanism to force the compositor to process events.
-    event_loop_waker: Option<Box<dyn EventLoopWaker>>,
-
     /// Pipeline ID of the active media session.
     active_media_session: Option<PipelineId>,
 
@@ -563,9 +560,6 @@ pub struct InitialConstellationState {
     /// Application window's GL Context for Media player
     pub player_context: WindowGLContext,
 
-    /// Mechanism to force the compositor to process events.
-    pub event_loop_waker: Option<Box<dyn EventLoopWaker>>,
-
     /// User agent string to report in network requests.
     pub user_agent: Cow<'static, str>,
 
@@ -827,7 +821,6 @@ where
                     enable_canvas_antialiasing,
                     glplayer_threads: state.glplayer_threads,
                     player_context: state.player_context,
-                    event_loop_waker: state.event_loop_waker,
                     active_media_session: None,
                     user_agent: state.user_agent,
                 };
@@ -1078,7 +1071,7 @@ where
                 .map(|threads| threads.pipeline()),
             webxr_registry: self.webxr_registry.clone(),
             player_context: self.player_context.clone(),
-            event_loop_waker: self.event_loop_waker.as_ref().map(|w| (*w).clone_box()),
+            event_loop_waker: None,
             user_agent: self.user_agent.clone(),
         });
 
diff --git a/components/constellation/pipeline.rs b/components/constellation/pipeline.rs
index df05d709924..d536d63bc60 100644
--- a/components/constellation/pipeline.rs
+++ b/components/constellation/pipeline.rs
@@ -327,11 +327,7 @@ impl Pipeline {
                     let register = state
                         .background_monitor_register
                         .expect("Couldn't start content, no background monitor has been initiated");
-                    unprivileged_pipeline_content.start_all::<Message, LTF, STF>(
-                        false,
-                        register,
-                        state.event_loop_waker,
-                    );
+                    unprivileged_pipeline_content.start_all::<Message, LTF, STF>(false, register);
                     None
                 };
 
@@ -527,7 +523,6 @@ impl UnprivilegedPipelineContent {
         self,
         wait_for_completion: bool,
         background_hang_monitor_register: Box<dyn BackgroundHangMonitorRegister>,
-        event_loop_waker: Option<Box<dyn EventLoopWaker>>,
     ) where
         LTF: LayoutThreadFactory<Message = Message>,
         STF: ScriptThreadFactory<Message = Message>,
@@ -574,7 +569,6 @@ impl UnprivilegedPipelineContent {
                 webrender_api_sender: self.webrender_api_sender.clone(),
                 layout_is_busy: layout_thread_busy_flag.clone(),
                 player_context: self.player_context.clone(),
-                event_loop_waker,
                 inherited_secure_context: self.load_data.inherited_secure_context.clone(),
             },
             self.load_data.clone(),
diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index cedbbd5cc7e..39807da9a81 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -63,7 +63,6 @@ use canvas_traits::webgl::{
     YAxisTreatment,
 };
 use dom_struct::dom_struct;
-use embedder_traits::EventLoopWaker;
 use euclid::default::{Point2D, Rect, Size2D};
 use ipc_channel::ipc::{self, IpcSharedMemory};
 use js::jsapi::{JSContext, JSObject, Type};
@@ -236,10 +235,7 @@ impl WebGLRenderingContext {
             let max_vertex_attribs = ctx_data.limits.max_vertex_attribs as usize;
             Self {
                 reflector_: Reflector::new(),
-                webgl_sender: WebGLMessageSender::new(
-                    ctx_data.sender,
-                    window.get_event_loop_waker(),
-                ),
+                webgl_sender: WebGLMessageSender::new(ctx_data.sender),
                 webrender_image: ctx_data.image_key,
                 webgl_version,
                 glsl_version: ctx_data.glsl_version,
@@ -4895,21 +4891,15 @@ pub enum TexSource {
 pub struct WebGLCommandSender {
     #[no_trace]
     sender: WebGLChan,
-    #[no_trace]
-    waker: Option<Box<dyn EventLoopWaker>>,
 }
 
 impl WebGLCommandSender {
-    pub fn new(sender: WebGLChan, waker: Option<Box<dyn EventLoopWaker>>) -> WebGLCommandSender {
-        WebGLCommandSender { sender, waker }
+    pub fn new(sender: WebGLChan) -> WebGLCommandSender {
+        WebGLCommandSender { sender }
     }
 
     pub fn send(&self, msg: WebGLMsg) -> WebGLSendResult {
-        let result = self.sender.send(msg);
-        if let Some(ref waker) = self.waker {
-            waker.wake();
-        }
-        result
+        self.sender.send(msg)
     }
 }
 
@@ -4917,34 +4907,19 @@ impl WebGLCommandSender {
 pub(crate) struct WebGLMessageSender {
     #[no_trace]
     sender: WebGLMsgSender,
-    #[ignore_malloc_size_of = "traits are cumbersome"]
-    #[no_trace]
-    waker: Option<Box<dyn EventLoopWaker>>,
 }
 
 impl Clone for WebGLMessageSender {
     fn clone(&self) -> WebGLMessageSender {
         WebGLMessageSender {
             sender: self.sender.clone(),
-            waker: self.waker.as_ref().map(|w| (*w).clone_box()),
         }
     }
 }
 
 impl WebGLMessageSender {
-    fn wake_after_send<F: FnOnce() -> WebGLSendResult>(&self, f: F) -> WebGLSendResult {
-        let result = f();
-        if let Some(ref waker) = self.waker {
-            waker.wake();
-        }
-        result
-    }
-
-    pub fn new(
-        sender: WebGLMsgSender,
-        waker: Option<Box<dyn EventLoopWaker>>,
-    ) -> WebGLMessageSender {
-        WebGLMessageSender { sender, waker }
+    pub fn new(sender: WebGLMsgSender) -> WebGLMessageSender {
+        WebGLMessageSender { sender }
     }
 
     pub fn context_id(&self) -> WebGLContextId {
@@ -4952,7 +4927,7 @@ impl WebGLMessageSender {
     }
 
     pub fn send(&self, msg: WebGLCommand, backtrace: WebGLCommandBacktrace) -> WebGLSendResult {
-        self.wake_after_send(|| self.sender.send(msg, backtrace))
+        self.sender.send(msg, backtrace)
     }
 
     pub fn send_resize(
@@ -4960,11 +4935,11 @@ impl WebGLMessageSender {
         size: Size2D<u32>,
         sender: WebGLSender<Result<(), String>>,
     ) -> WebGLSendResult {
-        self.wake_after_send(|| self.sender.send_resize(size, sender))
+        self.sender.send_resize(size, sender)
     }
 
     pub fn send_remove(&self) -> WebGLSendResult {
-        self.wake_after_send(|| self.sender.send_remove())
+        self.sender.send_remove()
     }
 }
 
diff --git a/components/script/dom/window.rs b/components/script/dom/window.rs
index 65dc4118583..4d8bc430ee9 100644
--- a/components/script/dom/window.rs
+++ b/components/script/dom/window.rs
@@ -371,11 +371,6 @@ pub struct Window {
     #[no_trace]
     player_context: WindowGLContext,
 
-    /// A mechanism to force the compositor to process events.
-    #[ignore_malloc_size_of = "traits are cumbersome"]
-    #[no_trace]
-    event_loop_waker: Option<Box<dyn EventLoopWaker>>,
-
     visible: Cell<bool>,
 
     /// A shared marker for the validity of any cached layout values. A value of true
@@ -514,7 +509,7 @@ impl Window {
     pub(crate) fn webgl_chan(&self) -> Option<WebGLCommandSender> {
         self.webgl_chan
             .as_ref()
-            .map(|chan| WebGLCommandSender::new(chan.clone(), self.get_event_loop_waker()))
+            .map(|chan| WebGLCommandSender::new(chan.clone()))
     }
 
     pub fn webxr_registry(&self) -> webxr_api::Registry {
@@ -570,10 +565,6 @@ impl Window {
         self.player_context.clone()
     }
 
-    pub fn get_event_loop_waker(&self) -> Option<Box<dyn EventLoopWaker>> {
-        self.event_loop_waker.as_ref().map(|w| (*w).clone_box())
-    }
-
     // see note at https://dom.spec.whatwg.org/#concept-event-dispatch step 2
     pub fn dispatch_event_with_target_override(&self, event: &Event) -> EventStatus {
         if self.has_document() {
@@ -2587,7 +2578,6 @@ impl Window {
         replace_surrogates: bool,
         user_agent: Cow<'static, str>,
         player_context: WindowGLContext,
-        event_loop_waker: Option<Box<dyn EventLoopWaker>>,
         gpu_id_hub: Arc<ParkMutex<Identities>>,
         inherited_secure_context: Option<bool>,
     ) -> DomRoot<Self> {
@@ -2673,7 +2663,6 @@ impl Window {
             userscripts_path,
             replace_surrogates,
             player_context,
-            event_loop_waker,
             visible: Cell::new(true),
             layout_marker: DomRefCell::new(Rc::new(Cell::new(true))),
             current_event: DomRefCell::new(None),
diff --git a/components/script/script_thread.rs b/components/script/script_thread.rs
index b0b55eeb43a..b9833da8e3f 100644
--- a/components/script/script_thread.rs
+++ b/components/script/script_thread.rs
@@ -715,10 +715,6 @@ pub struct ScriptThread {
     #[no_trace]
     player_context: WindowGLContext,
 
-    /// A mechanism to force the compositor's event loop to process events.
-    #[no_trace]
-    event_loop_waker: Option<Box<dyn EventLoopWaker>>,
-
     /// A set of all nodes ever created in this script thread
     node_ids: DomRefCell<HashSet<String>>,
 
@@ -1416,7 +1412,6 @@ impl ScriptThread {
             replace_surrogates: opts.debug.replace_surrogates,
             user_agent,
             player_context: state.player_context,
-            event_loop_waker: state.event_loop_waker,
 
             node_ids: Default::default(),
             is_user_interacting: Cell::new(false),
@@ -3295,6 +3290,7 @@ impl ScriptThread {
             self.timer_task_source(incomplete.pipeline_id),
             self.websocket_task_source(incomplete.pipeline_id),
         );
+
         // Create the window and document objects.
         let window = Window::new(
             self.js_runtime.clone(),
@@ -3333,7 +3329,6 @@ impl ScriptThread {
             self.replace_surrogates,
             self.user_agent.clone(),
             self.player_context.clone(),
-            self.event_loop_waker.as_ref().map(|w| (*w).clone_box()),
             self.gpu_id_hub.clone(),
             incomplete.inherited_secure_context,
         );
diff --git a/components/script_traits/lib.rs b/components/script_traits/lib.rs
index f85a833df94..a6291cf5745 100644
--- a/components/script_traits/lib.rs
+++ b/components/script_traits/lib.rs
@@ -38,7 +38,7 @@ use canvas_traits::webgl::WebGLPipeline;
 use compositor::ScrollTreeNodeId;
 use crossbeam_channel::{Receiver, RecvTimeoutError, Sender};
 use devtools_traits::{DevtoolScriptControlMsg, ScriptToDevtoolsControlMsg, WorkerId};
-use embedder_traits::{Cursor, EventLoopWaker};
+use embedder_traits::Cursor;
 use euclid::{default::Point2D, Length, Rect, Scale, Size2D, UnknownUnit, Vector2D};
 use gfx_traits::Epoch;
 use http::HeaderMap;
@@ -687,8 +687,6 @@ pub struct InitialScriptState {
     pub layout_is_busy: Arc<AtomicBool>,
     /// Application window's GL Context for Media player
     pub player_context: WindowGLContext,
-    /// Mechanism to force the compositor to process events.
-    pub event_loop_waker: Option<Box<dyn EventLoopWaker>>,
 }
 
 /// This trait allows creating a `ScriptThread` without depending on the `script`
diff --git a/components/servo/lib.rs b/components/servo/lib.rs
index 91a263d450e..e82994e46ff 100644
--- a/components/servo/lib.rs
+++ b/components/servo/lib.rs
@@ -454,8 +454,6 @@ where
 
         webrender.set_external_image_handler(external_image_handlers);
 
-        let event_loop_waker = None;
-
         // The division by 1 represents the page's default zoom of 100%,
         // and gives us the appropriate CSSPixel type for the viewport.
         let window_size = WindowSizeData {
@@ -480,7 +478,6 @@ where
             player_context,
             Some(webgl_threads),
             glplayer_threads,
-            event_loop_waker,
             window_size,
             external_images,
             wgpu_image_map,
@@ -851,7 +848,6 @@ fn create_constellation(
     player_context: WindowGLContext,
     webgl_threads: Option<WebGLThreads>,
     glplayer_threads: Option<GLPlayerThreads>,
-    event_loop_waker: Option<Box<dyn EventLoopWaker>>,
     initial_window_size: WindowSizeData,
     external_images: Arc<Mutex<WebrenderExternalImageRegistry>>,
     wgpu_image_map: Arc<Mutex<HashMap<u64, webgpu::PresentationData>>>,
@@ -899,7 +895,6 @@ fn create_constellation(
         webgl_threads,
         glplayer_threads,
         player_context,
-        event_loop_waker,
         user_agent,
         webrender_external_images: external_images,
         wgpu_image_map,
@@ -1046,7 +1041,6 @@ pub fn run_content_process(token: String) {
                                     script::script_thread::ScriptThread>(
                                         true,
                                         background_hang_monitor_register,
-                                        None,
                                     );
             } else {
                 content.start_all::<script_layout_interface::message::Msg,
@@ -1054,7 +1048,6 @@ pub fn run_content_process(token: String) {
                                     script::script_thread::ScriptThread>(
                                         true,
                                         background_hang_monitor_register,
-                                        None,
                                     );
             }
         },