93 lines
4.2 KiB
Diff
93 lines
4.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Fri, 29 May 2020 20:29:02 -0400
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Subject: [PATCH] Synchronize PalettedContainer instead of ReentrantLock
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Mojang has flaws in their logic about chunks being concurrently
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wrote to. So we constantly see crashes around multiple threads writing.
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Additionally, java has optimized synchronization so well that its
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in many times faster than trying to manage read wrote locks for low
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contention situations.
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And this is extremely a low contention situation.
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diff --git a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
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index 2bedc0f38ef16e922197a6f8e4c17aeb9cab92fd..33ffda30ce812a2497ba220046119445d00a11d3 100644
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--- a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
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+++ b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
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@@ -37,16 +37,18 @@ public class PalettedContainer<T> implements PaletteResize<T> {
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private final DebugBuffer<Pair<Thread, StackTraceElement[]>> traces = null;
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public void acquire() {
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+ /* // Paper start - disable this - use proper synchronization
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if (this.traces != null) {
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Thread thread = Thread.currentThread();
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this.traces.push(Pair.of(thread, thread.getStackTrace()));
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}
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ThreadingDetector.checkAndLock(this.lock, this.traces, "PalettedContainer");
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+ */ // Paper end
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}
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public void release() {
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- this.lock.release();
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+ //this.lock.release(); // Paper - disable this
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}
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// Paper start - Anti-Xray - Add predefined objects
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@@ -134,7 +136,7 @@ public class PalettedContainer<T> implements PaletteResize<T> {
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return this.palette.idFor(objectAdded);
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}
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- public T getAndSet(int x, int y, int z, T value) {
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+ public synchronized T getAndSet(int x, int y, int z, T value) { // Paper - synchronize
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Object var6;
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try {
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this.acquire();
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@@ -158,7 +160,7 @@ public class PalettedContainer<T> implements PaletteResize<T> {
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return (T)(object == null ? this.defaultValue : object);
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}
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- public void set(int i, int j, int k, T object) {
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+ public synchronized void set(int i, int j, int k, T object) { // Paper - synchronize
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try {
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this.acquire();
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this.set(getIndex(i, j, k), object);
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@@ -182,7 +184,7 @@ public class PalettedContainer<T> implements PaletteResize<T> {
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return (T)(object == null ? this.defaultValue : object);
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}
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- public void read(FriendlyByteBuf buf) {
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+ public synchronized void read(FriendlyByteBuf buf) { // Paper - synchronize
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try {
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this.acquire();
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int i = buf.readByte();
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@@ -203,7 +205,7 @@ public class PalettedContainer<T> implements PaletteResize<T> {
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@Deprecated public void write(FriendlyByteBuf buf) {
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write(buf, null, 0);
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}
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- public void write(FriendlyByteBuf buf, com.destroystokyo.paper.antixray.ChunkPacketInfo<T> chunkPacketInfo, int bottomBlockY) {
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+ public synchronized void write(FriendlyByteBuf buf, com.destroystokyo.paper.antixray.ChunkPacketInfo<T> chunkPacketInfo, int bottomBlockY) { // Paper - synchronize
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// Paper end
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try {
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this.acquire();
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@@ -226,7 +228,7 @@ public class PalettedContainer<T> implements PaletteResize<T> {
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}
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- public void read(ListTag paletteNbt, long[] data) {
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+ public synchronized void read(ListTag paletteNbt, long[] data) { // Paper - synchronize
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try {
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this.acquire();
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// Paper - Anti-Xray - TODO: Should this.predefinedObjects.length just be added here (faster) or should the contents be compared to calculate the size (less RAM)?
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@@ -261,7 +263,7 @@ public class PalettedContainer<T> implements PaletteResize<T> {
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}
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- public void write(CompoundTag nbt, String paletteKey, String dataKey) {
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+ public synchronized void write(CompoundTag nbt, String paletteKey, String dataKey) { // Paper - synchronize
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try {
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this.acquire();
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HashMapPalette<T> hashMapPalette = new HashMapPalette<>(this.registry, this.bits, this.dummyPaletteResize, this.reader, this.writer);
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