Paper/patches/server/0746-ChunkMap.mainInvokingExecutor.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Sat, 14 Aug 2021 14:49:45 +0100
Subject: [PATCH] ChunkMap.mainInvokingExecutor

This is a temp patch, this should maybe be moved to a more generic map or potentially wrapped into mcutil for the sake of this being such a generic concept
anyways

diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index c42f564ecac75f7947c580e7514795c26097761e..70891232460665ff0d1f80ff09e3773753168d4a 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -150,6 +150,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
     public final ServerLevel level;
     private final ThreadedLevelLightEngine lightEngine;
     private final BlockableEventLoop<Runnable> mainThreadExecutor;
+    final java.util.concurrent.Executor mainInvokingExecutor; // Paper // Paper - Move to MCUtil?
     public final ChunkGenerator generator;
     public final Supplier<DimensionDataStorage> overworldDataStorage;
     private final PoiManager poiManager;
@@ -355,6 +356,15 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
         this.level = world;
         this.generator = chunkGenerator;
         this.mainThreadExecutor = mainThreadExecutor;
+        // Paper start
+        this.mainInvokingExecutor = (run) -> {
+            if (MCUtil.isMainThread()) {
+                run.run();
+            } else {
+                mainThreadExecutor.execute(run);
+            }
+        };
+        // Paper end
         ProcessorMailbox<Runnable> threadedmailbox = ProcessorMailbox.create(executor, "worldgen");
 
         Objects.requireNonNull(mainThreadExecutor);