PaperMC/Spigot-Server-Patches/0376-Fix-FileIOThread-concurrency-issues.patch
Zach Brown 8ed2992da9
Make scan-for-legacy-ender-dragon config work again
Portion of diff was dropped in the mappings update commit.

Also remove the option to remove invalid statistics. The server will
automatically do this now as of... 1.13?, our option wasn't even doing anything.
2018-12-14 20:17:27 -05:00

35 lines
1.6 KiB
Diff

From 735de45cac6b82ec25348841a58a83c41f6ac9e4 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Wed, 3 Oct 2018 19:04:53 +0100
Subject: [PATCH] Fix FileIOThread concurrency issues
FileIOThread was using two volatile counters in order to track if
any pending work was in the queue, this causes potential concurrency
issues when this counter is updated from multiple threads, potentially
causing these counters to desync due to the unsafe volatile update
diff --git a/src/main/java/net/minecraft/server/FileIOThread.java b/src/main/java/net/minecraft/server/FileIOThread.java
index 97917551a..1959bc066 100644
--- a/src/main/java/net/minecraft/server/FileIOThread.java
+++ b/src/main/java/net/minecraft/server/FileIOThread.java
@@ -9,7 +9,7 @@ import org.apache.logging.log4j.Logger;
public class FileIOThread implements Runnable {
private static final Logger a = LogManager.getLogger();
private static final FileIOThread b = new FileIOThread();
- private final List<IAsyncChunkSaver> c = Collections.synchronizedList(Lists.newArrayList());
+ private final List<IAsyncChunkSaver> c = Collections.synchronizedList(Lists.newArrayList()); private List<IAsyncChunkSaver> getThreadedIOQueue() { return c; } // Paper - OBFHELPER
private volatile long d;
private volatile long e;
private volatile boolean f;
@@ -72,7 +72,7 @@ public class FileIOThread implements Runnable {
public void b() throws InterruptedException {
this.f = true;
- while(this.d != this.e) {
+ while(!this.getThreadedIOQueue().isEmpty()) { // Paper - check actual list size
Thread.sleep(10L);
}
--
2.20.0