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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.
78 lines
4.6 KiB
Diff
78 lines
4.6 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: Tue, 22 Mar 2022 12:44:30 -0700
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Subject: [PATCH] Throw exception on world create while being ticked
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There are no plans to support creating worlds while worlds are
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being ticked themselvess.
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diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
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index 94aa901b77b19445a33d5b2b24ba2e947d2a6aef..11b9eb8d7d5f9ad736f2c6784c5d9e745a355093 100644
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--- a/src/main/java/net/minecraft/server/MinecraftServer.java
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+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
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@@ -317,6 +317,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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public final double[] recentTps = new double[ 3 ];
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// Spigot end
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public final io.papermc.paper.configuration.PaperConfigurations paperConfigurations; // Paper - add paper configuration files
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+ public boolean isIteratingOverLevels = false; // Paper - Throw exception on world create while being ticked
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public static <S extends MinecraftServer> S spin(Function<Thread, S> serverFactory) {
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AtomicReference<S> atomicreference = new AtomicReference();
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@@ -1580,7 +1581,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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this.getFunctions().tick();
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MinecraftTimings.commandFunctionsTimer.stopTiming(); // Spigot // Paper
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this.profiler.popPush("levels");
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- Iterator iterator = this.getAllLevels().iterator();
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+ //Iterator iterator = this.getAllLevels().iterator(); // Paper - Throw exception on world create while being ticked; moved down
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// CraftBukkit start
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// Run tasks that are waiting on processing
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@@ -1612,6 +1613,8 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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// Paper end - Perf: Optimize time updates
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MinecraftTimings.timeUpdateTimer.stopTiming(); // Spigot // Paper
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+ this.isIteratingOverLevels = true; // Paper - Throw exception on world create while being ticked
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+ Iterator iterator = this.getAllLevels().iterator(); // Paper - Throw exception on world create while being ticked; move down
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while (iterator.hasNext()) {
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ServerLevel worldserver = (ServerLevel) iterator.next();
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worldserver.hasPhysicsEvent = org.bukkit.event.block.BlockPhysicsEvent.getHandlerList().getRegisteredListeners().length > 0; // Paper - BlockPhysicsEvent
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@@ -1647,6 +1650,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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this.profiler.pop();
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worldserver.explosionDensityCache.clear(); // Paper - Optimize explosions
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}
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+ this.isIteratingOverLevels = false; // Paper - Throw exception on world create while being ticked
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this.profiler.popPush("connection");
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MinecraftTimings.connectionTimer.startTiming(); // Spigot // Paper
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diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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index b09c1359e4bd5f287b9ce3682fd7d9defa8f7e61..50a4b51ff9b05786ac763f8277bb67c247c04d31 100644
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--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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@@ -916,6 +916,11 @@ public final class CraftServer implements Server {
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return new ArrayList<World>(this.worlds.values());
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}
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+ @Override
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+ public boolean isTickingWorlds() {
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+ return console.isIteratingOverLevels;
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+ }
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+
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public DedicatedPlayerList getHandle() {
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return this.playerList;
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}
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@@ -1178,6 +1183,7 @@ public final class CraftServer implements Server {
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@Override
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public World createWorld(WorldCreator creator) {
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Preconditions.checkState(this.console.getAllLevels().iterator().hasNext(), "Cannot create additional worlds on STARTUP");
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+ //Preconditions.checkState(!this.console.isIteratingOverLevels, "Cannot create a world while worlds are being ticked"); // Paper - Cat - Temp disable. We'll see how this goes.
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Preconditions.checkArgument(creator != null, "WorldCreator cannot be null");
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String name = creator.name();
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@@ -1354,6 +1360,7 @@ public final class CraftServer implements Server {
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@Override
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public boolean unloadWorld(World world, boolean save) {
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+ //Preconditions.checkState(!this.console.isIteratingOverLevels, "Cannot unload a world while worlds are being ticked"); // Paper - Cat - Temp disable. We'll see how this goes.
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if (world == null) {
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return false;
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}
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