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https://github.com/PaperMC/Paper.git
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f37381ea8a
Removes synchronization from sending packets
Makes normal packet sends no longer need to be wrapped and queued like it use to work.
Adds more packet queue immunities on top of keep alive to let the following scenarios go out
without delay:
- Keep Alive
- Chat
- Kick
- All of the packets during the Player Joined World event
Hoping that latter one helps join timeout issues more too for slow connections.
Removes processing packet queue off of main thread
- for the few cases where it is allowed, order is not necessary nor
should it even be happening concurrently in first place (handshaking/login/status)
Ensures packets sent asynchronously are dispatched on main thread
This helps ensure safety for ProtocolLib as packet listeners
are commonly accessing world state. This will allow you to schedule
a packet to be sent async, but itll be dispatched sync for packet
listeners to process.
This should solve some deadlock risks
This may provide a decent performance improvement because thread synchronization incurs a cache reset
so by avoiding ever entering a synchronized block, we get to avoid that, and packet sending is a really
hot activity.
52 lines
3.0 KiB
Diff
52 lines
3.0 KiB
Diff
From 752b4b4ee83b0fb68b360836985b4b5868f5193f Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Fri, 21 Jun 2019 14:42:48 -0700
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Subject: [PATCH] Log other thread in DataPaletteBlock lock failure
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diff --git a/src/main/java/com/destroystokyo/paper/util/ReentrantLockWithGetOwner.java b/src/main/java/com/destroystokyo/paper/util/ReentrantLockWithGetOwner.java
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new file mode 100644
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index 00000000000..a3b174618d4
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--- /dev/null
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+++ b/src/main/java/com/destroystokyo/paper/util/ReentrantLockWithGetOwner.java
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@@ -0,0 +1,11 @@
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+package com.destroystokyo.paper.util;
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+
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+import java.util.concurrent.locks.ReentrantLock;
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+
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+public class ReentrantLockWithGetOwner extends ReentrantLock {
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+
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+ @Override
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+ public Thread getOwner() {
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+ return super.getOwner();
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+ }
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+}
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diff --git a/src/main/java/net/minecraft/server/DataPaletteBlock.java b/src/main/java/net/minecraft/server/DataPaletteBlock.java
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index d5f5a51872d..2c1d1b1a556 100644
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--- a/src/main/java/net/minecraft/server/DataPaletteBlock.java
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+++ b/src/main/java/net/minecraft/server/DataPaletteBlock.java
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@@ -22,14 +22,17 @@ public class DataPaletteBlock<T> implements DataPaletteExpandable<T> {
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protected DataBits a; protected DataBits getDataBits() { return this.a; } // Paper - OBFHELPER
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private DataPalette<T> h; private DataPalette<T> getDataPalette() { return this.h; } // Paper - OBFHELPER
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private int i; private int getBitsPerObject() { return this.i; } // Paper - OBFHELPER
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- private final ReentrantLock j = new ReentrantLock();
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+ private final com.destroystokyo.paper.util.ReentrantLockWithGetOwner j = new com.destroystokyo.paper.util.ReentrantLockWithGetOwner(); private com.destroystokyo.paper.util.ReentrantLockWithGetOwner getLock() { return this.j; } // Paper - change type to ReentrantLockWithGetOwner // Paper - OBFHELPER
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public void a() {
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- if (this.j.isLocked() && !this.j.isHeldByCurrentThread()) {
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+ // Paper start - log other thread
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+ Thread owningThread;
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+ if (this.j.isLocked() && (owningThread = this.getLock().getOwner()) != null && owningThread != Thread.currentThread()) {
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+ // Paper end
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String s = (String) Thread.getAllStackTraces().keySet().stream().filter(Objects::nonNull).map((thread) -> {
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return thread.getName() + ": \n\tat " + (String) Arrays.stream(thread.getStackTrace()).map(Object::toString).collect(Collectors.joining("\n\tat "));
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}).collect(Collectors.joining("\n"));
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- CrashReport crashreport = new CrashReport("Writing into PalettedContainer from multiple threads", new IllegalStateException());
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+ CrashReport crashreport = new CrashReport("Writing into PalettedContainer from multiple threads (other thread: name: " + owningThread.getName() + ", class: " + owningThread.getClass().toString() + ")", new IllegalStateException()); // Paper - log other thread
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CrashReportSystemDetails crashreportsystemdetails = crashreport.a("Thread dumps");
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crashreportsystemdetails.a("Thread dumps", (Object) s);
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--
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2.26.2
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