Merge pull request #10 from Unity-Technologies/delaycall-fix

Tasks with UI affinity are now invoked faster.

Author: ignas2

extras/com.unity.editor.tasks/Tests/package.json

@@ -4,6 +4,7 @@
     "description": "Tests - Unity Editor Tasks",
     "type": "tests",
     "version": "0.0.0-placeholder",
+    "unity": "2018.4",
     "license" : "MIT",
     "author": {
       "name": "Andreia Gaita",

src/com.unity.editor.tasks/Editor/Schedulers/MainThreadSynchronizationContext.cs

@@ -6,12 +6,22 @@ namespace Unity.Editor.Tasks
 	using Helpers;
 
 #if UNITY_EDITOR
-
+	using System.Collections.Concurrent;
 	using UnityEditor;
 
 	public class MainThreadSynchronizationContext: SynchronizationContext, IMainThreadSynchronizationContext
 	{
-		public MainThreadSynchronizationContext(CancellationToken token = default) { }
+		private readonly ConcurrentQueue<Action> m_Callbacks = new ConcurrentQueue<Action>();
+
+		public MainThreadSynchronizationContext(CancellationToken token = default)
+		{
+			EditorApplication.update += Update;
+		}
+
+		public void Dispose()
+		{
+			EditorApplication.update -= Update;
+		}
 
 		public void Schedule(Action action)
 		{
@@ -24,10 +34,14 @@ public override void Post(SendOrPostCallback d, object state)
 			if (d == null)
 				return;
 
-			EditorApplication.delayCall += () => d(state);
+			m_Callbacks.Enqueue(() => d(state));
 		}
 
-		public void Dispose() {}
+		void Update()
+		{
+			while (m_Callbacks.TryDequeue(out var callback))
+				callback();
+		}
 	}
 #else
 	public class MainThreadSynchronizationContext : ThreadSynchronizationContext, IMainThreadSynchronizationContext

src/com.unity.editor.tasks/package.json

@@ -3,6 +3,7 @@
     "displayName": "Unity Editor Tasks",
     "description": "A friendly threaded task system for the Unity Editor.",
     "version": "0.0.0-placeholder",
+    "unity": "2018.4",
     "license" : "MIT",
     "author": {
       "name": "Andreia Gaita",