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Code Issues Packages Projects Releases Wiki Activity

Avoid Unsafe on paper (#1678)

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This commit is contained in:
Hannes Greule
2022-03-27 23:56:59 +02:00
committed by GitHub
parent d1588f9207
commit c45b14a52d
6 changed files with 64 additions and 24 deletions
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6
worldedit-bukkit/adapters/adapter-1_18_2/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_18_R2/PaperweightGetBlocks.java
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@ -1,7 +1,6 @@
package com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_18_R2;
import com.fastasyncworldedit.bukkit.adapter.BukkitGetBlocks;
import com.fastasyncworldedit.bukkit.adapter.DelegateSemaphore;
import com.fastasyncworldedit.core.Fawe;
import com.fastasyncworldedit.core.FaweCache;
import com.fastasyncworldedit.core.configuration.Settings;
@ -76,6 +75,7 @@ import java.util.Set;
import java.util.UUID;
import java.util.concurrent.Callable;
import java.util.concurrent.Future;
import java.util.concurrent.Semaphore;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.function.Function;
@ -576,7 +576,7 @@ public class PaperweightGetBlocks extends CharGetBlocks implements BukkitGetBloc
if (PaperLib.isPaper()) {
existingSection.tickingList.clear();
}
DelegateSemaphore lock = PaperweightPlatformAdapter.applyLock(existingSection);
Semaphore lock = PaperweightPlatformAdapter.applyLock(existingSection);
synchronized (lock) {
// lock.acquire();
@ -914,7 +914,7 @@ public class PaperweightGetBlocks extends CharGetBlocks implements BukkitGetBloc
data = new char[4096];
Arrays.fill(data, (char) BlockTypesCache.ReservedIDs.AIR);
}
DelegateSemaphore lock = PaperweightPlatformAdapter.applyLock(section);
Semaphore lock = PaperweightPlatformAdapter.applyLock(section);
synchronized (lock) {
// Efficiently convert ChunkSection to raw data
try {

26
worldedit-bukkit/adapters/adapter-1_18_2/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_18_R2/PaperweightPlatformAdapter.java
View File

@ -132,11 +132,20 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
methodGetVisibleChunk = MethodHandles.lookup().unreflect(getVisibleChunkIfPresent);
Unsafe unsafe = ReflectionUtils.getUnsafe();
fieldThreadingDetector = PalettedContainer.class.getDeclaredField(Refraction.pickName("threadingDetector", "f"));
fieldThreadingDetectorOffset = unsafe.objectFieldOffset(fieldThreadingDetector);
if (!PaperLib.isPaper()) {
fieldThreadingDetector = PalettedContainer.class.getDeclaredField(Refraction.pickName("threadingDetector", "f"));
fieldThreadingDetectorOffset = unsafe.objectFieldOffset(fieldThreadingDetector);
fieldLock = ThreadingDetector.class.getDeclaredField(Refraction.pickName("lock", "c"));
fieldLockOffset = unsafe.objectFieldOffset(fieldLock);
fieldLock = ThreadingDetector.class.getDeclaredField(Refraction.pickName("lock", "c"));
fieldLockOffset = unsafe.objectFieldOffset(fieldLock);
} else {
// in paper, the used methods are synchronized properly
fieldThreadingDetector = null;
fieldThreadingDetectorOffset = -1;
fieldLock = null;
fieldLockOffset = -1;
}
fieldGameEventDispatcherSections = LevelChunk.class.getDeclaredField(Refraction.pickName(
"gameEventDispatcherSections", "t"));
@ -180,7 +189,12 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
return false;
}
static DelegateSemaphore applyLock(LevelChunkSection section) {
private static final ThreadLocal<Semaphore> SEMAPHORE_THREAD_LOCAL = ThreadLocal.withInitial(() -> new Semaphore(1));
static Semaphore applyLock(LevelChunkSection section) {
if (PaperLib.isPaper()) {
return SEMAPHORE_THREAD_LOCAL.get();
}
try {
synchronized (section) {
Unsafe unsafe = ReflectionUtils.getUnsafe();
@ -192,7 +206,7 @@ public final class PaperweightPlatformAdapter extends NMSAdapter {
synchronized (currentThreadingDetector) {
Semaphore currentLock = (Semaphore) unsafe.getObject(currentThreadingDetector, fieldLockOffset);
if (currentLock instanceof DelegateSemaphore) {
return (DelegateSemaphore) currentLock;
return currentLock;
}
DelegateSemaphore newLock = new DelegateSemaphore(1, currentLock);
unsafe.putObject(currentThreadingDetector, fieldLockOffset, newLock);