Paper/CraftBukkit-Patches/0011-Alternate-sync-free-but-safe-chunk-reference-cache.patch

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From 6591b85a8d8dba678747feafc3e0bcec83bd6979 Mon Sep 17 00:00:00 2001
From: Mike Primm <mike@primmhome.com>
Date: Wed, 16 Jan 2013 15:27:22 -0600
Subject: [PATCH] Alternate, sync-free-but-safe chunk reference cache
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index af85d8b..eb03aba 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -293,15 +293,13 @@ public abstract class World implements IBlockAccess {
// CraftBukkit start
public Chunk getChunkAt(int i, int j) {
- Chunk result = null;
- synchronized (this.chunkLock) {
- if (this.lastChunkAccessed == null || this.lastXAccessed != i || this.lastZAccessed != j) {
- this.lastChunkAccessed = this.chunkProvider.getOrCreateChunk(i, j);
- this.lastXAccessed = i;
- this.lastZAccessed = j;
- }
- result = this.lastChunkAccessed;
+ //synchronized (this.chunkLock) {
+ Chunk result = this.lastChunkAccessed; // Exploit fact that read is atomic
+ if (result == null || result.x != i || result.z != j) {
+ result = this.chunkProvider.getOrCreateChunk(i, j);
+ this.lastChunkAccessed = result; // Exploit fact that write is atomic
}
+ //}
return result;
}
// CraftBukkit end
--
1.8.2.1