PaperMC/Spigot-Server-Patches/0348-Fix-CraftServer-isPrimaryThread-and-MinecraftServer-.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Mon, 13 May 2019 21:10:59 -0700
Subject: [PATCH] Fix CraftServer#isPrimaryThread and MinecraftServer
 isMainThread

md_5 changed it so he could shut down the server asynchronously
from watchdog, although we have patches that prevent that type
of behavior for this exact reason.

md_5 also placed code in PlayerConnectionUtils that would have
solved https://bugs.mojang.com/browse/MC-142590, making the change
to MinecraftServer#isMainThread irrelevant.
By reverting his change to MinecraftServer#isMainThread packet
handling that should have been handled synchronously will be handled
synchronously when the server gets shut down.

diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 46503c75ced00902ef675ad1f3800fb9236a3703..44991803a489a42842f79ce51bdd53a73ef35d71 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -2071,7 +2071,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
     // CraftBukkit start
     @Override
     public boolean isMainThread() {
-        return super.isMainThread() || this.isStopped(); // CraftBukkit - MC-142590
+        return super.isMainThread() /*|| this.isStopped()*/; // CraftBukkit - MC-142590 // Paper - causes issues elsewhere
     }
 
     public boolean isDebugging() {
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 9dd46d0dd0e623a9fab98e8529d1c5f9912dbbb7..c606ba5335a3843bfe98f9b3536afb991bf17464 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -1793,7 +1793,7 @@ public final class CraftServer implements Server {
 
     @Override
     public boolean isPrimaryThread() {
-        return Thread.currentThread().equals(console.serverThread) || console.hasStopped() || !org.spigotmc.AsyncCatcher.enabled; // All bets are off if we have shut down (e.g. due to watchdog)
+        return Thread.currentThread().equals(console.serverThread); // Paper - Fix issues with detecting main thread properly
     }
 
     @Override