PaperMC/patches/server/0751-Make-CallbackExecutor-strict-again.patch
Nassim Jahnke f44d237de9
Updated Upstream (CraftBukkit) (#6504)
Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

CraftBukkit Changes:
5be41fb8 SPIGOT-6720: Fix bed explosion checks
09b99daf SPIGOT-6722: Close entity manager when unloading world
3a9561bf SPIGOT-6686: Changes in MaximumRepairCost for Anvil Rename cause inconsistency
2021-08-27 11:51:18 +02:00

48 lines
2.3 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <spottedleaf@spottedleaf.dev>
Date: Fri, 24 Apr 2020 09:06:15 -0700
Subject: [PATCH] Make CallbackExecutor strict again
The correct fix for double scheduling is to avoid it. The reason
this class is used is because double scheduling causes issues
elsewhere, and it acts as an explicit detector of what double
schedules. Effectively, use the callback executor as a tool of
finding issues rather than hiding these issues.
diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index 1c662deee2a3184c7612cf7de5f798753fbd7381..d11c70dc9f65171827190028ebcc4db7331fff20 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -182,17 +182,28 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
public final CallbackExecutor callbackExecutor = new CallbackExecutor();
public static final class CallbackExecutor implements java.util.concurrent.Executor, Runnable {
- private final java.util.Queue<Runnable> queue = new java.util.ArrayDeque<>();
+ private Runnable queued; // Paper - revert CB changes
@Override
public void execute(Runnable runnable) {
- this.queue.add(runnable);
+ // Paper start - revert CB changes
+ org.spigotmc.AsyncCatcher.catchOp("Callback Executor execute");
+ if (this.queued != null) {
+ MinecraftServer.LOGGER.fatal("Failed to schedule runnable", new IllegalStateException("Already queued"));
+ throw new IllegalStateException("Already queued");
+ }
+ this.queued = runnable;
+ // Paper end - revert CB changes
}
@Override
public void run() {
- Runnable task;
- while ((task = this.queue.poll()) != null) {
+ // Paper start - revert CB changes
+ org.spigotmc.AsyncCatcher.catchOp("Callback Executor execute");
+ Runnable task = this.queued;
+ if (task != null) {
+ this.queued = null;
+ // Paper end - revert CB changes
task.run();
}
}