Make EventLoopProxy Sync

Co-authored-by: daxpedda <daxpedda@gmail.com>
Closes: #3448

src/platform_impl/web/async/dispatcher.rs

@@ -5,7 +5,7 @@ use std::{
     sync::{Arc, Condvar, Mutex},
 };
 
-pub struct Dispatcher<T: 'static>(Wrapper<true, T, Sender<Closure<T>>, Closure<T>>);
+pub struct Dispatcher<T: 'static>(Wrapper<T, Sender<Closure<T>>, Closure<T>>);
 
 struct Closure<T>(Box<dyn FnOnce(&T) + Send>);
 
@@ -85,7 +85,7 @@ impl<T> Dispatcher<T> {
 }
 
 pub struct DispatchRunner<T: 'static> {
-    wrapper: Wrapper<true, T, Sender<Closure<T>>, Closure<T>>,
+    wrapper: Wrapper<T, Sender<Closure<T>>, Closure<T>>,
     receiver: Receiver<Closure<T>>,
 }
 

src/platform_impl/web/async/waker.rs

@@ -6,9 +6,9 @@ use std::task::Poll;
 use super::super::main_thread::MainThreadMarker;
 use super::{AtomicWaker, Wrapper};
 
-pub struct WakerSpawner<T: 'static>(Wrapper<false, Handler<T>, Sender, usize>);
+pub struct WakerSpawner<T: 'static>(Wrapper<Handler<T>, Sender, usize>);
 
-pub struct Waker<T: 'static>(Wrapper<false, Handler<T>, Sender, usize>);
+pub struct Waker<T: 'static>(Wrapper<Handler<T>, Sender, usize>);
 
 struct Handler<T> {
     value: T,

src/platform_impl/web/async/wrapper.rs

@@ -6,14 +6,14 @@ use std::sync::Arc;
 
 // Unsafe wrapper type that allows us to use `T` when it's not `Send` from other threads.
 // `value` **must** only be accessed on the main thread.
-pub struct Wrapper<const SYNC: bool, V: 'static, S: Clone + Send, E> {
-    value: Value<SYNC, V>,
+pub struct Wrapper<V: 'static, S: Clone + Send, E> {
+    value: Value<V>,
     handler: fn(&RefCell<Option<V>>, E),
     sender_data: S,
     sender_handler: fn(&S, E),
 }
 
-struct Value<const SYNC: bool, V> {
+struct Value<V> {
     // SAFETY:
     // This value must not be accessed if not on the main thread.
     //
@@ -28,11 +28,11 @@ struct Value<const SYNC: bool, V> {
 }
 
 // SAFETY: See `Self::value`.
-unsafe impl<const SYNC: bool, V> Send for Value<SYNC, V> {}
+unsafe impl<V> Send for Value<V> {}
 // SAFETY: See `Self::value`.
-unsafe impl<V> Sync for Value<true, V> {}
+unsafe impl<V> Sync for Value<V> {}
 
-impl<const SYNC: bool, V, S: Clone + Send, E> Wrapper<SYNC, V, S, E> {
+impl<V, S: Clone + Send, E> Wrapper<V, S, E> {
     #[track_caller]
     pub fn new<R: Future<Output = ()>>(
         _: MainThreadMarker,
@@ -81,7 +81,7 @@ impl<const SYNC: bool, V, S: Clone + Send, E> Wrapper<SYNC, V, S, E> {
     }
 }
 
-impl<const SYNC: bool, V, S: Clone + Send, E> Clone for Wrapper<SYNC, V, S, E> {
+impl<V, S: Clone + Send, E> Clone for Wrapper<V, S, E> {
     fn clone(&self) -> Self {
         Self {
             value: Value {