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Sync free, but still safe reference cache for chunk loading.

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md_5 2013-01-19 19:22:07 +11:00
parent cfd861ca46
commit 22bb4da32a
1 changed files with 38 additions and 0 deletions
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38
CraftBukkit-Patches/0018-Alternate-sync-free-but-safe-chunk-reference-cache.patch Normal file
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@ -0,0 +1,38 @@
From 369fd92f61f955ef427c3db66a650458b095f26a 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
---
src/main/java/net/minecraft/server/World.java | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 6e9b13d..e28aa00 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -297,15 +297,13 @@ 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
--
1.8.1-rc2