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70 lines
3.6 KiB
Diff
70 lines
3.6 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: Mon, 6 Jul 2020 18:36:41 -0400
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Subject: [PATCH] Fix Concurrency issue in ShufflingList
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if multiple threads from worldgen sort at same time, it will crash.
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So make a copy of the list for sorting purposes.
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diff --git a/src/main/java/net/minecraft/world/entity/ai/behavior/GateBehavior.java b/src/main/java/net/minecraft/world/entity/ai/behavior/GateBehavior.java
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index 419eadbe31b86b7192fd7a63268d547705e7c7ce..b45c4f50705f80163d44d9e588f86a5770f5be38 100644
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--- a/src/main/java/net/minecraft/world/entity/ai/behavior/GateBehavior.java
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+++ b/src/main/java/net/minecraft/world/entity/ai/behavior/GateBehavior.java
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@@ -17,7 +17,7 @@ public class GateBehavior<E extends LivingEntity> implements BehaviorControl<E>
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private final Set<MemoryModuleType<?>> exitErasedMemories;
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private final GateBehavior.OrderPolicy orderPolicy;
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private final GateBehavior.RunningPolicy runningPolicy;
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- private final ShufflingList<BehaviorControl<? super E>> behaviors = new ShufflingList<>();
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+ private final ShufflingList<BehaviorControl<? super E>> behaviors = new ShufflingList<>(false); // Paper - don't use a clone
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private Behavior.Status status = Behavior.Status.STOPPED;
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public GateBehavior(Map<MemoryModuleType<?>, MemoryStatus> requiredMemoryState, Set<MemoryModuleType<?>> memoriesToForgetWhenStopped, GateBehavior.OrderPolicy order, GateBehavior.RunningPolicy runMode, List<Pair<? extends BehaviorControl<? super E>, Integer>> tasks) {
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diff --git a/src/main/java/net/minecraft/world/entity/ai/behavior/ShufflingList.java b/src/main/java/net/minecraft/world/entity/ai/behavior/ShufflingList.java
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index 9fb20cd00568aeea25284ea0e80fe52cb1c3eede..731ef21dbbd25d6924717de42f4569a9b5935643 100644
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--- a/src/main/java/net/minecraft/world/entity/ai/behavior/ShufflingList.java
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+++ b/src/main/java/net/minecraft/world/entity/ai/behavior/ShufflingList.java
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@@ -16,12 +16,25 @@ import net.minecraft.util.RandomSource;
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public class ShufflingList<U> implements Iterable<U> {
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protected final List<ShufflingList.WeightedEntry<U>> entries;
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private final RandomSource random = RandomSource.create();
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+ private final boolean isUnsafe; // Paper
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public ShufflingList() {
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+ // Paper start
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+ this(true);
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+ }
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+ public ShufflingList(boolean isUnsafe) {
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+ this.isUnsafe = isUnsafe;
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+ // Paper end
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this.entries = Lists.newArrayList();
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}
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private ShufflingList(List<ShufflingList.WeightedEntry<U>> list) {
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+ // Paper start
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+ this(list, true);
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+ }
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+ private ShufflingList(List<ShufflingList.WeightedEntry<U>> list, boolean isUnsafe) {
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+ this.isUnsafe = isUnsafe;
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+ // Paper end
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this.entries = Lists.newArrayList(list);
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}
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@@ -37,11 +50,12 @@ public class ShufflingList<U> implements Iterable<U> {
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}
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public ShufflingList<U> shuffle() {
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- this.entries.forEach((entry) -> {
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- entry.setRandom(this.random.nextFloat());
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- });
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- this.entries.sort(Comparator.comparingDouble(ShufflingList.WeightedEntry::getRandWeight));
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- return this;
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+ // Paper start - make concurrent safe, work off a clone of the list
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+ List<ShufflingList.WeightedEntry<U>> list = this.isUnsafe ? Lists.newArrayList(this.entries) : this.entries;
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+ list.forEach(entry -> entry.setRandom(this.random.nextFloat()));
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+ list.sort(Comparator.comparingDouble(ShufflingList.WeightedEntry::getRandWeight));
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+ return this.isUnsafe ? new ShufflingList<>(list, this.isUnsafe) : this;
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+ // Paper end
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}
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public Stream<U> stream() {
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