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Paper/patches/server/0734-Correctly-handle-recursion-for-chunkholder-updates.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sun, 21 Mar 2021 17:32:47 -0700
Subject: [PATCH] Correctly handle recursion for chunkholder updates
If a chunk ticket level is brought up while unloading it would
cause a recursive call which would handle the increase but then
the caller would think the chunk would be unloaded.
diff --git a/src/main/java/net/minecraft/server/level/ChunkHolder.java b/src/main/java/net/minecraft/server/level/ChunkHolder.java
index 17a71e2fce455552c0e8af4073c516c21bc3e208..6bfc705cbf3d8efdb0926df4e1bc6948f9052440 100644
--- a/src/main/java/net/minecraft/server/level/ChunkHolder.java
+++ b/src/main/java/net/minecraft/server/level/ChunkHolder.java
@@ -438,8 +438,10 @@ public class ChunkHolder {
playerchunkmap.onFullChunkStatusChange(this.pos, playerchunk_state);
}
+ protected long updateCount; // Paper - correctly handle recursion
protected void updateFutures(ChunkMap chunkStorage, Executor executor) {
io.papermc.paper.util.TickThread.ensureTickThread("Async ticket level update"); // Paper
+ long updateCount = ++this.updateCount; // Paper - correctly handle recursion
ChunkStatus chunkstatus = ChunkHolder.getStatus(this.oldTicketLevel);
ChunkStatus chunkstatus1 = ChunkHolder.getStatus(this.ticketLevel);
boolean flag = this.oldTicketLevel <= ChunkMap.MAX_CHUNK_DISTANCE;
@@ -481,6 +483,12 @@ public class ChunkHolder {
// Run callback right away if the future was already done
chunkStorage.callbackExecutor.run();
+ // Paper start - correctly handle recursion
+ if (this.updateCount != updateCount) {
+ // something else updated ticket level for us.
+ return;
+ }
+ // Paper end - correctly handle recursion
}
// CraftBukkit end