Paper/Spigot-Server-Patches/0137-Enforce-Sync-Player-Saves.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 7 Jan 2017 15:41:58 -0500
Subject: [PATCH] Enforce Sync Player Saves

Saving players async is extremely dangerous. This will force it to main
the same way we handle async chunk loads.

diff --git a/src/main/java/net/minecraft/server/PlayerList.java b/src/main/java/net/minecraft/server/PlayerList.java
index aeb0a77d9aaf3877310528286a481f71fd5a4290..a97941d1f8a125c6d033b1d359c1527937f97799 100644
--- a/src/main/java/net/minecraft/server/PlayerList.java
+++ b/src/main/java/net/minecraft/server/PlayerList.java
@@ -918,11 +918,13 @@ public abstract class PlayerList {
     }
 
     public void savePlayers() {
+        MCUtil.ensureMain("Save Players" , () -> { // Paper - Ensure main
         MinecraftTimings.savePlayers.startTiming(); // Paper
         for (int i = 0; i < this.players.size(); ++i) {
             this.savePlayerFile((EntityPlayer) this.players.get(i));
         }
         MinecraftTimings.savePlayers.stopTiming(); // Paper
+        return null; }); // Paper - ensure main
     }
 
     public WhiteList getWhitelist() {