102 lines
4.4 KiB
Diff
102 lines
4.4 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 DataPaletteBlock 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/server/DataPaletteBlock.java b/src/main/java/net/minecraft/server/DataPaletteBlock.java
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index eabc9d7b934f27c823e012f3f10fffc23b461292..f4c1b8d32b239c44e70d3fa6d094b74955f75339 100644
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--- a/src/main/java/net/minecraft/server/DataPaletteBlock.java
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+++ b/src/main/java/net/minecraft/server/DataPaletteBlock.java
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@@ -23,7 +23,7 @@ public class DataPaletteBlock<T> implements DataPaletteExpandable<T> {
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private int i; private int getBitsPerObject() { return this.i; } // Paper - OBFHELPER
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private final ReentrantLock j = new ReentrantLock();
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- public void a() {
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+ public void a() { /* // Paper start - disable this - use proper synchronization
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if (this.j.isLocked() && !this.j.isHeldByCurrentThread()) {
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String s = (String) Thread.getAllStackTraces().keySet().stream().filter(Objects::nonNull).map((thread) -> {
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return thread.getName() + ": \n\tat " + (String) Arrays.stream(thread.getStackTrace()).map(Object::toString).collect(Collectors.joining("\n\tat "));
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@@ -35,11 +35,11 @@ public class DataPaletteBlock<T> implements DataPaletteExpandable<T> {
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throw new ReportedException(crashreport);
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} else {
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this.j.lock();
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- }
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+ } */ // Paper end
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}
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public void b() {
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- this.j.unlock();
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+ //this.j.unlock(); // Paper - disable this
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}
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public DataPaletteBlock(DataPalette<T> datapalette, RegistryBlockID<T> registryblockid, Function<NBTTagCompound, T> function, Function<T, NBTTagCompound> function1, T t0) {
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@@ -75,7 +75,7 @@ public class DataPaletteBlock<T> implements DataPaletteExpandable<T> {
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}
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@Override
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- public int onResize(int i, T t0) {
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+ public synchronized int onResize(int i, T t0) { // Paper - synchronize
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this.a();
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DataBits databits = this.a;
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DataPalette<T> datapalette = this.h;
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@@ -98,18 +98,18 @@ public class DataPaletteBlock<T> implements DataPaletteExpandable<T> {
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}
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public T setBlock(int i, int j, int k, T t0) {
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- this.a();
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- T t1 = this.a(b(i, j, k), t0);
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+ //this.a(); // Paper - remove to reduce ops - synchronize handled below
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+ return this.a(b(i, j, k), t0); // Paper
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- this.b();
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- return t1;
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+ //this.b(); // Paper
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+ //return t1; // PAper
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}
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public T b(int i, int j, int k, T t0) {
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return this.a(b(i, j, k), t0);
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}
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- protected T a(int i, T t0) {
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+ protected synchronized T a(int i, T t0) { // Paper - synchronize - writes
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int j = this.h.a(t0);
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int k = this.a.a(i, j);
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T t1 = this.h.a(k);
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@@ -134,7 +134,7 @@ public class DataPaletteBlock<T> implements DataPaletteExpandable<T> {
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}
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public void writeDataPaletteBlock(PacketDataSerializer packetDataSerializer) { this.b(packetDataSerializer); } // Paper - OBFHELPER
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- public void b(PacketDataSerializer packetdataserializer) {
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+ public synchronized void b(PacketDataSerializer packetdataserializer) { // Paper - synchronize
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this.a();
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packetdataserializer.writeByte(this.i);
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this.h.b(packetdataserializer);
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@@ -142,7 +142,7 @@ public class DataPaletteBlock<T> implements DataPaletteExpandable<T> {
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this.b();
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}
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- public void a(NBTTagList nbttaglist, long[] along) {
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+ public synchronized void a(NBTTagList nbttaglist, long[] along) { // Paper - synchronize
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this.a();
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int i = Math.max(4, MathHelper.e(nbttaglist.size()));
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@@ -175,7 +175,7 @@ public class DataPaletteBlock<T> implements DataPaletteExpandable<T> {
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this.b();
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}
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- public void a(NBTTagCompound nbttagcompound, String s, String s1) {
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+ public synchronized void a(NBTTagCompound nbttagcompound, String s, String s1) { // Paper - synchronize
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this.a();
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DataPaletteHash<T> datapalettehash = new DataPaletteHash<>(this.d, this.i, this.c, this.e, this.f);
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T t0 = this.g;
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