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01a13871de
Patch documentation to come Issues with the old system that are fixed now: - World generation does not scale with cpu cores effectively. - Relies on the main thread for scheduling and maintaining chunk state, dropping chunk load/generate rates at lower tps. - Unreliable prioritisation of chunk gen/load calls that block the main thread. - Shutdown logic is utterly unreliable, as it has to wait for all chunks to unload - is it guaranteed that the chunk system is in a state on shutdown that it can reliably do this? Watchdog shutdown also typically failed due to thread checks, which is now resolved. - Saving of data is not unified (i.e can save chunk data without saving entity data, poses problems for desync if shutdown is really abnormal. - Entities are not loaded with chunks. This caused quite a bit of headache for Chunk#getEntities API, but now the new chunk system loads entities with chunks so that they are ready whenever the chunk loads in. Effectively brings the behavior back to 1.16 era, but still storing entities in their own separate regionfiles. The above list is not complete. The patch documentation will complete it. New chunk system hard relies on starlight and dataconverter, and most importantly the new concurrent utilities in ConcurrentUtil. Some of the old async chunk i/o interface (i.e the old file io thread reroutes _some_ calls to the new file io thread) is kept for plugin compat reasons. It will be removed in the next major version of minecraft. The old legacy chunk system patches have been moved to the removed folder in case we need them again.
90 lines
4.2 KiB
Diff
90 lines
4.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Sat, 19 Jun 2021 22:47:17 -0700
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Subject: [PATCH] Allow removal/addition of entities to entity ticklist during
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tick
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It really doesn't make any sense that we would iterate over removed
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entities during tick. Sure - tick entity checks removed, but
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does it check if the entity is in an entity ticking chunk?
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No it doesn't. So, allowing removal while iteration
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ENSURES only entities MARKED TO TICK are ticked.
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diff --git a/src/main/java/net/minecraft/world/level/entity/EntityTickList.java b/src/main/java/net/minecraft/world/level/entity/EntityTickList.java
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index a176a886235494fdc722030a93658d361bf50f03..4cdfc433df67afcd455422e9baf56f167dd712ae 100644
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--- a/src/main/java/net/minecraft/world/level/entity/EntityTickList.java
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+++ b/src/main/java/net/minecraft/world/level/entity/EntityTickList.java
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@@ -8,57 +8,42 @@ import javax.annotation.Nullable;
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import net.minecraft.world.entity.Entity;
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public class EntityTickList {
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- private Int2ObjectMap<Entity> active = new Int2ObjectLinkedOpenHashMap<>();
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- private Int2ObjectMap<Entity> passive = new Int2ObjectLinkedOpenHashMap<>();
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- @Nullable
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- private Int2ObjectMap<Entity> iterated;
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+ private final io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet<Entity> entities = new io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet<>(true); // Paper - rewrite this, always keep this updated - why would we EVER tick an entity that's not ticking?
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private void ensureActiveIsNotIterated() {
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- if (this.iterated == this.active) {
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- this.passive.clear();
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-
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- for(Int2ObjectMap.Entry<Entity> entry : Int2ObjectMaps.fastIterable(this.active)) {
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- this.passive.put(entry.getIntKey(), entry.getValue());
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- }
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-
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- Int2ObjectMap<Entity> int2ObjectMap = this.active;
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- this.active = this.passive;
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- this.passive = int2ObjectMap;
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- }
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+ // Paper - replace with better logic, do not delay removals
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}
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public void add(Entity entity) {
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io.papermc.paper.util.TickThread.ensureTickThread("Asynchronous entity ticklist addition"); // Paper
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this.ensureActiveIsNotIterated();
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- this.active.put(entity.getId(), entity);
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+ this.entities.add(entity); // Paper - replace with better logic, do not delay removals/additions
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}
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public void remove(Entity entity) {
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io.papermc.paper.util.TickThread.ensureTickThread("Asynchronous entity ticklist removal"); // Paper
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this.ensureActiveIsNotIterated();
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- this.active.remove(entity.getId());
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+ this.entities.remove(entity); // Paper - replace with better logic, do not delay removals/additions
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}
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public boolean contains(Entity entity) {
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- return this.active.containsKey(entity.getId());
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+ return this.entities.contains(entity); // Paper - replace with better logic, do not delay removals/additions
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}
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public void forEach(Consumer<Entity> action) {
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io.papermc.paper.util.TickThread.ensureTickThread("Asynchronous entity ticklist iteration"); // Paper
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- if (this.iterated != null) {
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- throw new UnsupportedOperationException("Only one concurrent iteration supported");
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- } else {
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- this.iterated = this.active;
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-
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- try {
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- for(Entity entity : this.active.values()) {
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- action.accept(entity);
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- }
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- } finally {
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- this.iterated = null;
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+ // Paper start - replace with better logic, do not delay removals/additions
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+ // To ensure nothing weird happens with dimension travelling, do not iterate over new entries...
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+ // (by dfl iterator() is configured to not iterate over new entries)
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+ io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet.Iterator<Entity> iterator = this.entities.iterator();
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+ try {
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+ while (iterator.hasNext()) {
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+ action.accept(iterator.next());
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}
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-
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+ } finally {
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+ iterator.finishedIterating();
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}
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+ // Paper end - replace with better logic, do not delay removals/additions
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}
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}
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