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Paper/CraftBukkit-Patches/0014-Sync-Free-Chunk-Reference-Cache.patch

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From e95aac5349ba7dac025251bc1c0c006dbfbfd010 Mon Sep 17 00:00:00 2001
From: Mike Primm <mike@primmhome.com>
Date: Wed, 16 Jan 2013 15:27:22 -0600
Subject: [PATCH] Sync Free Chunk Reference Cache
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 146285f..5ea860f 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -292,20 +292,18 @@ public abstract class World implements IBlockAccess {
return this.getChunkAt(i >> 4, j >> 4);
}
+ // Spigot start
public Chunk getChunkAt(int i, int j) {
- // CraftBukkit start
- 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.locX != i || result.locZ != j) {
+ result = this.chunkProvider.getOrCreateChunk(i, j);
+ this.lastChunkAccessed = result; // Exploit fact that write is atomic
}
+ //}
return result;
- // CraftBukkit end
}
+ // Spigot end
public boolean setTypeAndData(int i, int j, int k, Block block, int l, int i1) {
if (i >= -30000000 && k >= -30000000 && i < 30000000 && k < 30000000) {
--
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