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Fix PalettedContainer synchronization (#7663)

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This commit is contained in:
Jason Penilla 2022-03-27 10:51:39 -07:00
parent 7b6d5e3a6b
commit 44c710fdbe
1 changed files with 27 additions and 22 deletions
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49
patches/server/Synchronize-PalettedContainer-instead-of-ReentrantLo.patch → patches/server/Synchronize-PalettedContainer-instead-of-ThreadingDe.patch
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@ -1,13 +1,14 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Fri, 29 May 2020 20:29:02 -0400
Subject: [PATCH] Synchronize PalettedContainer instead of ReentrantLock
Subject: [PATCH] Synchronize PalettedContainer instead of
ThreadingDetector/Semaphore
Mojang has flaws in their logic about chunks being concurrently
wrote to. So we constantly see crashes around multiple threads writing.
Additionally, java has optimized synchronization so well that its
in many times faster than trying to manage read wrote locks for low
in many times faster than trying to manage read write locks for low
contention situations.
And this is extremely a low contention situation.
@ -17,7 +18,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
--- a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
+++ b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
@@ -0,0 +0,0 @@ public class PalettedContainer<T> implements PaletteResize<T> {
private final ThreadingDetector threadingDetector = new ThreadingDetector("PalettedContainer");
private final T @org.jetbrains.annotations.Nullable [] presetValues; // Paper - Anti-Xray - Add preset values
private volatile PalettedContainer.Data<T> data;
private final PalettedContainer.Strategy strategy;
- private final ThreadingDetector threadingDetector = new ThreadingDetector("PalettedContainer");
+ // private final ThreadingDetector threadingDetector = new ThreadingDetector("PalettedContainer"); // Paper - unused
public void acquire() {
- this.threadingDetector.checkAndLock();
@ -32,22 +37,31 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
// Paper start - Anti-Xray - Add preset values
@@ -0,0 +0,0 @@ public class PalettedContainer<T> implements PaletteResize<T> {
}
// Paper end
- public T getAndSet(int x, int y, int z, T value) {
+ public synchronized T getAndSet(int x, int y, int z, T value) { // Paper - synchronize
this.acquire();
@Override
- public int onResize(int newBits, T object) {
+ public synchronized int onResize(int newBits, T object) { // Paper - synchronize
PalettedContainer.Data<T> data = this.data;
Object var5;
// Paper start - Anti-Xray - Add preset values
@@ -0,0 +0,0 @@ public class PalettedContainer<T> implements PaletteResize<T> {
return this.data.palette.valueFor(j);
return this.getAndSet(this.strategy.getIndex(x, y, z), value);
}
- public void set(int x, int y, int z, T value) {
+ public synchronized void set(int x, int y, int z, T value) { // Paper - synchronize
this.acquire();
- private T getAndSet(int index, T value) {
+ private synchronized T getAndSet(int index, T value) { // Paper - synchronize
int i = this.data.palette.idFor(value);
int j = this.data.storage.getAndSet(index, i);
return this.data.palette.valueFor(j);
@@ -0,0 +0,0 @@ public class PalettedContainer<T> implements PaletteResize<T> {
try {
}
- private void set(int index, T value) {
+ private synchronized void set(int index, T value) { // Paper - synchronize
int i = this.data.palette.idFor(value);
this.data.storage.set(index, i);
}
@@ -0,0 +0,0 @@ public class PalettedContainer<T> implements PaletteResize<T> {
});
}
@ -67,15 +81,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
try {
@@ -0,0 +0,0 @@ public class PalettedContainer<T> implements PaletteResize<T> {
}
- private static <T> DataResult<PalettedContainer<T>> read(IdMap<T> idList, PalettedContainer.Strategy provider, PalettedContainer.DiscData<T> serialized, T defaultValue, T @org.jetbrains.annotations.Nullable [] presetValues) { // Paper - Anti-Xray - Add preset values
+ private synchronized static <T> DataResult<PalettedContainer<T>> read(IdMap<T> idList, PalettedContainer.Strategy provider, PalettedContainer.DiscData<T> serialized, T defaultValue, T @org.jetbrains.annotations.Nullable [] presetValues) { // Paper - Anti-Xray - Add preset values // Paper - synchronize
List<T> list = serialized.paletteEntries();
int i = provider.size();
int j = provider.calculateBitsForSerialization(idList, list.size());
@@ -0,0 +0,0 @@ public class PalettedContainer<T> implements PaletteResize<T> {
return DataResult.success(new PalettedContainer<>(idList, provider, configuration, bitStorage, list, defaultValue, presetValues)); // Paper - Anti-Xray - Add preset values
}