Merge pull request #5370 from pavlos256/lua-dispose-crash

Possible fix for lua crash #5269

OpenRA.Game/Scripting/ScriptContext.cs

@@ -81,11 +81,12 @@ namespace OpenRA.Scripting
 		public ScriptGlobalAttribute(string name) { Name = name; }
 	}
 
-	public class ScriptContext
+	public class ScriptContext : IDisposable
 	{
 		public World World { get; private set; }
 		public WorldRenderer WorldRenderer { get; private set; }
 
+		bool disposed;
 		readonly MemoryConstrainedLuaRuntime runtime;
 		readonly LuaFunction tick;
 
@@ -188,26 +189,34 @@ namespace OpenRA.Scripting
 
 		public void Tick(Actor self)
 		{
-			if (error)
+			if (error || disposed)
 				return;
 
 			using (new PerfSample("tick_lua"))
 				tick.Call().Dispose();
 		}
 
-		public void Dispose()
+		protected void Dispose(bool disposing)
 		{
-			if (runtime == null)
+			if (disposed)
 				return;
 
+			if (disposing)
+				runtime.Dispose();
+
+			disposed = true;
+		}
+
+		public void Dispose()
+		{
+			Dispose(true);
 			GC.SuppressFinalize(this);
-			runtime.Dispose();
 		}
 
 		~ScriptContext()
 		{
-			if (runtime != null)
-				Game.RunAfterTick(Dispose);
+			// Dispose unmanaged resources only
+			Dispose(false);
 		}
 
 		static Type[] ExtractRequiredTypes(Type t)

OpenRA.Mods.RA/Scripting/CallLuaFunc.cs

@@ -15,12 +15,13 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA.Activities
 {
-	public class CallLuaFunc : Activity
+	public class CallLuaFunc : Activity, IDisposable
 	{
 		LuaFunction function;
+
 		public CallLuaFunc(LuaFunction func)
 		{
-			function = func.CopyReference() as LuaFunction;
+			function = (LuaFunction)func.CopyReference();
 		}
 
 		public override Activity Tick(Actor self)
@@ -38,20 +39,28 @@ namespace OpenRA.Mods.RA.Activities
 			base.Cancel(self);
 		}
 
-		public void Dispose()
+		protected void Dispose(bool disposing)
 		{
 			if (function == null)
 				return;
 
+			if (disposing)
+			{
+				function.Dispose();
+				function = null;
+			}
+		}
+
+		public void Dispose()
+		{
+			Dispose(true);
 			GC.SuppressFinalize(this);
-			function.Dispose();
-			function = null;
 		}
 
 		~CallLuaFunc()
 		{
-			if (function != null)
-				Game.RunAfterTick(Dispose);
+			// Dispose unmanaged resources only
+			Dispose(false);
 		}
 	}
 }

OpenRA.Mods.RA/Scripting/ScriptTriggers.cs

@@ -21,7 +21,7 @@ namespace OpenRA.Mods.RA.Scripting
 	[Desc("Allows map scripts to attach triggers to this actor via the Triggers global.")]
 	public class ScriptTriggersInfo : TraitInfo<ScriptTriggers> { }
 
-	public class ScriptTriggers : INotifyIdle, INotifyDamage, INotifyKilled, INotifyProduction
+	public class ScriptTriggers : INotifyIdle, INotifyDamage, INotifyKilled, INotifyProduction, IDisposable
 	{
 		public event Action<Actor> OnKilledInternal = _ => {};
 
@@ -101,21 +101,36 @@ namespace OpenRA.Mods.RA.Scripting
 		}
 
 		bool disposed;
+
+		protected void Dispose(bool disposing)
+		{
+			if (disposed)
+				return;
+
+			if (disposing)
+			{
+				var toDispose = new [] { onIdle, onDamaged, onKilled, onProduction };
+
+				foreach (var f in toDispose.SelectMany(f => f))
+					f.First.Dispose();
+
+				foreach (var l in toDispose)
+					l.Clear();
+			}
+
+			disposed = true;
+		}
+
 		public void Dispose()
 		{
-			disposed = true;
-			var toDispose = new [] { onIdle, onDamaged, onKilled, onProduction };
-
-			foreach (var f in toDispose.SelectMany(f => f))
-				f.First.Dispose();
-
+			Dispose(true);
 			GC.SuppressFinalize(this);
 		}
 
 		~ScriptTriggers()
 		{
-			if (!disposed)
-				Game.RunAfterTick(Dispose);
+			// Dispose unmanaged resources only
+			Dispose(false);
 		}
 	}
 }