From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: wangxyper <wangxyper@163.com>
Date: Sun, 22 Jan 2023 13:32:24 +0800
Subject: [PATCH] Hearse: Fix a threading issue and ingore an error

Original license: MIT
Original project: https://github.com/Era4FunMC/Hearse

diff --git a/src/main/java/io/papermc/paper/chunk/PlayerChunkLoader.java b/src/main/java/io/papermc/paper/chunk/PlayerChunkLoader.java
index d9cee42da1b097590e627142d3c5dccbc180b5ae..23c32a06dce8f0c45647c3619c98ba95290cfa7d 100644
--- a/src/main/java/io/papermc/paper/chunk/PlayerChunkLoader.java
+++ b/src/main/java/io/papermc/paper/chunk/PlayerChunkLoader.java
@@ -518,6 +518,7 @@ public final class PlayerChunkLoader {
     protected static final AtomicInteger concurrentChunkSends = new AtomicInteger();
     protected final Reference2IntOpenHashMap<PlayerLoaderData> sendingChunkCounts = new Reference2IntOpenHashMap<>();
     private static long nextChunkSend;
+
     private void trySendChunks() {
         final long time = System.nanoTime();
         if (time < nextChunkSend) {
@@ -560,7 +561,7 @@ public final class PlayerChunkLoader {
             }
 
             if (!this.isChunkPlayerLoaded(queuedSend.chunkX, queuedSend.chunkZ)) {
-                throw new IllegalStateException();
+                continue;
             }
 
             data.nextChunkSendTarget = nextPlayerDeadline;
@@ -722,12 +723,13 @@ public final class PlayerChunkLoader {
         }
     }
 
+
     public void tickMidTick() {
-        // try to send more chunks
-        this.trySendChunks();
+            // try to send more chunks
+            this.trySendChunks();
 
-        // try to queue more chunks to load
-        this.tryLoadChunks();
+            // try to queue more chunks to load
+            this.tryLoadChunks();
     }
 
     static final class ChunkPriorityHolder {
diff --git a/src/main/java/net/minecraft/server/level/ServerChunkCache.java b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
index becac3c1087c77b289c3b0a721c4146bea046e51..2caa5ab3a7b4bf0c535863f5ff54fcb8c0dc3c59 100644
--- a/src/main/java/net/minecraft/server/level/ServerChunkCache.java
+++ b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
@@ -937,6 +937,8 @@ public class ServerChunkCache extends ChunkSource {
         this.spawnFriendlies = spawnAnimals;
     }
 
+    private final Object pollTaskLock = new Object();
+
     public String getChunkDebugData(ChunkPos pos) {
         return this.chunkMap.getChunkDebugData(pos);
     }
@@ -963,6 +965,7 @@ public class ServerChunkCache extends ChunkSource {
         this.distanceManager.removeTicketsOnClosing();
     }
 
+
     public final class MainThreadExecutor extends BlockableEventLoop<Runnable> {
 
         MainThreadExecutor(Level world) {
@@ -998,9 +1001,11 @@ public class ServerChunkCache extends ChunkSource {
         @Override
         // CraftBukkit start - process pending Chunk loadCallback() and unloadCallback() after each run task
         public boolean pollTask() {
-            ServerChunkCache.this.chunkMap.playerChunkManager.tickMidTick();
-            if (ServerChunkCache.this.runDistanceManagerUpdates()) {
-                return true;
+            synchronized (ServerChunkCache.this.pollTaskLock){
+                ServerChunkCache.this.chunkMap.playerChunkManager.tickMidTick();
+                if (ServerChunkCache.this.runDistanceManagerUpdates()) {
+                    return true;
+                }
             }
             return super.pollTask() | ServerChunkCache.this.level.chunkTaskScheduler.executeMainThreadTask(); // Paper - rewrite chunk system
         }