geforkt von Mirrors/Paper
8c5b837e05
Firstly, the old methods all routed to the CompletableFuture method. However, the CF method could not guarantee that if the caller was off-main that the future would be "completed" on-main. Since the callback methods used the CF one, this meant that the callback methods did not guarantee that the callbacks were to be called on the main thread. Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb) so that the methods with the callback are guaranteed to invoke the callback on the main thread. The CF behavior remains unchanged; it may still appear to complete on main if invoked off-main. Secondly, remove the scheduleOnMain invocation in the async chunk completion. This unnecessarily delays the callback by 1 tick. Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which will load chunks within an area. This method is provided as a helper as keeping all chunks loaded within an area can be complicated to implement for plugins (due to the lacking ticket API), and is already implemented internally anyways. Fourthly, remove the ticket addition that occured with getChunkAt and getChunkAtAsync. The ticket addition may delay the unloading of the chunk unnecessarily. It also fixes a very rare timing bug where the future/callback would be completed after the chunk unloads.
92 Zeilen
4.2 KiB
Diff
92 Zeilen
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
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ThreadingDetector/Semaphore
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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 write 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 8c318c5f9eaaae1e961ff24247283c232fa84c20..112d1259dd37743076ff6c67ffd711d084ba8698 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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@@ -30,14 +30,14 @@ public class PalettedContainer<T> implements PaletteResize<T>, PalettedContainer
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public final IdMap<T> registry;
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private volatile PalettedContainer.Data<T> data;
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private final PalettedContainer.Strategy strategy;
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- private final ThreadingDetector threadingDetector = new ThreadingDetector("PalettedContainer");
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+ // private final ThreadingDetector threadingDetector = new ThreadingDetector("PalettedContainer"); // Paper - unused
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public void acquire() {
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- this.threadingDetector.checkAndLock();
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+ // this.threadingDetector.checkAndLock(); // Paper - disable this - use proper synchronization
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}
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public void release() {
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- this.threadingDetector.checkAndUnlock();
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+ // this.threadingDetector.checkAndUnlock(); // Paper - disable this
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}
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public static <T> Codec<PalettedContainer<T>> codecRW(IdMap<T> idList, Codec<T> entryCodec, PalettedContainer.Strategy paletteProvider, T defaultValue) {
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@@ -110,7 +110,7 @@ public class PalettedContainer<T> implements PaletteResize<T>, PalettedContainer
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}
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@Override
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- public int onResize(int newBits, T object) {
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+ public synchronized int onResize(int newBits, T object) { // Paper - synchronize
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PalettedContainer.Data<T> data = this.data;
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PalettedContainer.Data<T> data2 = this.createOrReuseData(data, newBits);
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data2.copyFrom(data.palette, data.storage);
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@@ -135,7 +135,7 @@ public class PalettedContainer<T> implements PaletteResize<T>, PalettedContainer
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return this.getAndSet(this.strategy.getIndex(x, y, z), value);
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}
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- private T getAndSet(int index, T value) {
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+ private synchronized T getAndSet(int index, T value) { // Paper - synchronize
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int i = this.data.palette.idFor(value);
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int j = this.data.storage.getAndSet(index, i);
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return this.data.palette.valueFor(j);
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@@ -151,7 +151,7 @@ public class PalettedContainer<T> implements PaletteResize<T>, PalettedContainer
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}
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}
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- private void set(int index, T value) {
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+ private synchronized void set(int index, T value) { // Paper - synchronize
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int i = this.data.palette.idFor(value);
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this.data.storage.set(index, i);
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}
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@@ -174,7 +174,7 @@ public class PalettedContainer<T> implements PaletteResize<T>, PalettedContainer
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intSet.forEach(id -> action.accept(palette.valueFor(id)));
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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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this.acquire();
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try {
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@@ -189,7 +189,7 @@ public class PalettedContainer<T> implements PaletteResize<T>, PalettedContainer
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}
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@Override
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- public void write(FriendlyByteBuf buf) {
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+ public synchronized void write(FriendlyByteBuf buf) { // Paper - synchronize
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this.acquire();
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try {
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@@ -237,7 +237,7 @@ public class PalettedContainer<T> implements PaletteResize<T>, PalettedContainer
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}
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@Override
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- public PalettedContainerRO.PackedData<T> pack(IdMap<T> idList, PalettedContainer.Strategy paletteProvider) {
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+ public synchronized PalettedContainerRO.PackedData<T> pack(IdMap<T> idList, PalettedContainer.Strategy paletteProvider) { // Paper - synchronize
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this.acquire();
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PalettedContainerRO.PackedData var12;
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