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c5a10665b8
Spigot still maintains some partial implementation of "tick skipping", a practice in which the MinecraftServer.currentTick field is updated not by an increment of one per actual tick, but instead set to System.currentTimeMillis() / 50. This behaviour means that the tracked tick may "skip" a tick value in case a previous tick took more than the expected 50ms. To compensate for this in important paths, spigot/craftbukkit implements "wall-time". Instead of incrementing/decrementing ticks on block entities/entities by one for each call to their tick() method, they instead increment/decrement important values, like an ItemEntity's age or pickupDelay, by the difference of `currentTick - lastTick`, where `lastTick` is the value of `currentTick` during the last tick() call. These "fixes" however do not play nicely with minecraft's simulation distance as entities/block entities implementing the above behaviour would "catch up" their values when moving from a non-ticking chunk to a ticking one as their `lastTick` value remains stuck on the last tick in a ticking chunk and hence lead to a large "catch up" once ticked again. Paper completely removes the "tick skipping" behaviour (See patch "Further-improve-server-tick-loop"), making the above precautions completely unnecessary, which also rids paper of the previous described incompatibility with non-ticking chunks.
42 Zeilen
2.5 KiB
Diff
42 Zeilen
2.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jake Potrebic <jake.m.potrebic@gmail.com>
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Date: Sun, 10 Jul 2022 14:13:22 -0700
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Subject: [PATCH] Don't use level random in entity constructors
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Paper makes the entity random thread-safe
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and constructing an entity off the main thread
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should be supported. Some entities (for whatever
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reason) use the level's random in some places.
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diff --git a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
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index df90d5b934f41f5d8c232e93830d6690b6ccf401..446c319524183d6a1b4d0e6f0613a8db690677da 100644
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--- a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
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+++ b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
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@@ -72,7 +72,12 @@ public class ItemEntity extends Entity implements TraceableEntity {
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}
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public ItemEntity(Level world, double x, double y, double z, ItemStack stack) {
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- this(world, x, y, z, stack, world.random.nextDouble() * 0.2D - 0.1D, 0.2D, world.random.nextDouble() * 0.2D - 0.1D);
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+ // Paper start - Don't use level random in entity constructors (to make them thread-safe)
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+ this(EntityType.ITEM, world);
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+ this.setPos(x, y, z);
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+ this.setDeltaMovement(this.random.nextDouble() * 0.2D - 0.1D, 0.2D, this.random.nextDouble() * 0.2D - 0.1D);
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+ this.setItem(stack);
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+ // Paper end - Don't use level random in entity constructors
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}
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public ItemEntity(Level world, double x, double y, double z, ItemStack stack, double velocityX, double velocityY, double velocityZ) {
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diff --git a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
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index 47f2a480f6a4b15e55cedbfa8a58459d33516a97..42bd2d9a1528b6210e4dfb56233062fd97c9743b 100644
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--- a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
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+++ b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
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@@ -62,7 +62,7 @@ public class PrimedTnt extends Entity implements TraceableEntity {
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public PrimedTnt(Level world, double x, double y, double z, @Nullable LivingEntity igniter) {
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this(EntityType.TNT, world);
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this.setPos(x, y, z);
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- double d3 = world.random.nextDouble() * 6.2831854820251465D;
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+ double d3 = this.random.nextDouble() * 6.2831854820251465D; // Paper - Don't use level random in entity constructors
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this.setDeltaMovement(-Math.sin(d3) * 0.02D, 0.20000000298023224D, -Math.cos(d3) * 0.02D);
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this.setFuse(80);
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