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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.
63 lines
3.6 KiB
Diff
63 lines
3.6 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, 12 Mar 2022 06:31:13 -0800
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Subject: [PATCH] Fix swamp hut cat generation deadlock
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The worldgen thread will attempt to get structure references
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via the world's getChunkAt method, which is fine if the gen is
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not cancelled - but if the chunk was unloaded, the call will block
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indefinitely. Instead of using the world state, we use the already
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supplied ServerLevelAccessor which will always have the chunk available.
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diff --git a/src/main/java/net/minecraft/world/entity/animal/Cat.java b/src/main/java/net/minecraft/world/entity/animal/Cat.java
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index 5ad968a2f1add27da0d6a858e683d5d771128092..e44352857272a2a4027c67bd25a28a9498b7bb49 100644
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--- a/src/main/java/net/minecraft/world/entity/animal/Cat.java
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+++ b/src/main/java/net/minecraft/world/entity/animal/Cat.java
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@@ -361,7 +361,7 @@ public class Cat extends TamableAnimal {
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});
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ServerLevel worldserver = world.getLevel();
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- if (worldserver.structureManager().getStructureWithPieceAt(this.blockPosition(), StructureTags.CATS_SPAWN_AS_BLACK).isValid()) {
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+ if (worldserver.structureManager().getStructureWithPieceAt(this.blockPosition(), StructureTags.CATS_SPAWN_AS_BLACK, world).isValid()) { // Paper - fix deadlock
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this.setCatVariant(CatVariant.ALL_BLACK);
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this.setPersistenceRequired();
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}
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diff --git a/src/main/java/net/minecraft/world/level/StructureManager.java b/src/main/java/net/minecraft/world/level/StructureManager.java
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index e7445c1ff0d1e3e989fcd8d3630dd5269a64598d..64ca546a905d69a795bbdafb4f9860b31cd863d1 100644
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--- a/src/main/java/net/minecraft/world/level/StructureManager.java
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+++ b/src/main/java/net/minecraft/world/level/StructureManager.java
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@@ -43,7 +43,12 @@ public class StructureManager {
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}
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public List<StructureStart> startsForStructure(ChunkPos pos, Predicate<Structure> predicate) {
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- Map<Structure, LongSet> map = this.level.getChunk(pos.x, pos.z, ChunkStatus.STRUCTURE_REFERENCES).getAllReferences();
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+ // Paper start
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+ return this.startsForStructure(pos, predicate, null);
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+ }
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+ public List<StructureStart> startsForStructure(ChunkPos pos, Predicate<Structure> predicate, @Nullable ServerLevelAccessor levelAccessor) {
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+ Map<Structure, LongSet> map = (levelAccessor == null ? this.level : levelAccessor).getChunk(pos.x, pos.z, ChunkStatus.STRUCTURE_REFERENCES).getAllReferences();
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+ // Paper end
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ImmutableList.Builder<StructureStart> builder = ImmutableList.builder();
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for(Map.Entry<Structure, LongSet> entry : map.entrySet()) {
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@@ -107,13 +112,18 @@ public class StructureManager {
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}
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public StructureStart getStructureWithPieceAt(BlockPos pos, TagKey<Structure> structureTag) {
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+ // Paper start
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+ return this.getStructureWithPieceAt(pos, structureTag, null);
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+ }
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+ public StructureStart getStructureWithPieceAt(BlockPos pos, TagKey<Structure> structureTag, @Nullable ServerLevelAccessor levelAccessor) {
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+ // Paper end
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Registry<Structure> registry = this.registryAccess().registryOrThrow(Registry.STRUCTURE_REGISTRY);
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for(StructureStart structureStart : this.startsForStructure(new ChunkPos(pos), (structure) -> {
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return registry.getHolder(registry.getId(structure)).map((holder) -> {
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return holder.is(structureTag);
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}).orElse(false);
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- })) {
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+ }, levelAccessor)) { // Paper
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if (this.structureHasPieceAt(pos, structureStart)) {
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return structureStart;
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}
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