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Synchronize PalettedContainer instead of ThreadingDetector/Semaphore

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Mojang has flaws in their logic about chunks being concurrently
wrote to. So we constantly see crashes around multiple threads writing.

Additionally, java has optimized synchronization so well that its
in many times faster than trying to manage read write locks for low
contention situations.

And this is extremely a low contention situation.
This commit is contained in:
Aikar 2020-05-29 20:29:02 -04:00
parent e86b844e04
commit c4f8064fb9
1 changed files with 74 additions and 0 deletions
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74
paper-server/patches/sources/net/minecraft/world/level/chunk/PalettedContainer.java.patch Normal file
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@ -0,0 +1,74 @@
--- a/net/minecraft/world/level/chunk/PalettedContainer.java
+++ b/net/minecraft/world/level/chunk/PalettedContainer.java
@@ -30,14 +30,14 @@
public final IdMap<T> registry;
private volatile PalettedContainer.Data<T> data;
private final PalettedContainer.Strategy strategy;
- private final ThreadingDetector threadingDetector = new ThreadingDetector("PalettedContainer");
+ // private final ThreadingDetector threadingDetector = new ThreadingDetector("PalettedContainer"); // Paper - unused
public void acquire() {
- this.threadingDetector.checkAndLock();
+ // this.threadingDetector.checkAndLock(); // Paper - disable this - use proper synchronization
}
public void release() {
- this.threadingDetector.checkAndUnlock();
+ // this.threadingDetector.checkAndUnlock(); // Paper - disable this
}
public static <T> Codec<PalettedContainer<T>> codecRW(IdMap<T> idList, Codec<T> entryCodec, PalettedContainer.Strategy paletteProvider, T defaultValue) {
@@ -110,7 +110,7 @@
}
@Override
- public int onResize(int newBits, T object) {
+ public synchronized int onResize(int newBits, T object) { // Paper - synchronize
PalettedContainer.Data<T> data = this.data;
PalettedContainer.Data<T> data2 = this.createOrReuseData(data, newBits);
data2.copyFrom(data.palette, data.storage);
@@ -135,7 +135,7 @@
return this.getAndSet(this.strategy.getIndex(x, y, z), value);
}
- private T getAndSet(int index, T value) {
+ private synchronized T getAndSet(int index, T value) { // Paper - synchronize
int i = this.data.palette.idFor(value);
int j = this.data.storage.getAndSet(index, i);
return this.data.palette.valueFor(j);
@@ -151,7 +151,7 @@
}
}
- private void set(int index, T value) {
+ private synchronized void set(int index, T value) { // Paper - synchronize
int i = this.data.palette.idFor(value);
this.data.storage.set(index, i);
}
@@ -174,7 +174,7 @@
intSet.forEach(id -> action.accept(palette.valueFor(id)));
}
- public void read(FriendlyByteBuf buf) {
+ public synchronized void read(FriendlyByteBuf buf) { // Paper - synchronize
this.acquire();
try {
@@ -189,7 +189,7 @@
}
@Override
- public void write(FriendlyByteBuf buf) {
+ public synchronized void write(FriendlyByteBuf buf) { // Paper - synchronize
this.acquire();
try {
@@ -237,7 +237,7 @@
}
@Override
- public PalettedContainerRO.PackedData<T> pack(IdMap<T> idList, PalettedContainer.Strategy paletteProvider) {
+ public synchronized PalettedContainerRO.PackedData<T> pack(IdMap<T> idList, PalettedContainer.Strategy paletteProvider) { // Paper - synchronize
this.acquire();
PalettedContainerRO.PackedData var12;