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Mirror von https://github.com/PaperMC/Paper.git synchronisiert 2024-12-17 03:50:08 +01:00
Paper/Spigot-API-Patches/0128-Remove-deadlock-risk-in-firing-async-events.patch
Aikar c0d07c1b67
Updated Upstream (Bukkit/CraftBukkit/Spigot)
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
f009c3dd SPIGOT-5810, SPIGOT-5835: 'Better' handling of Player.isOnGround
e677c370 Update ECJ version
5058a35d SPIGOT-5860: Item.setItemStack should be NotNull

CraftBukkit Changes:
d77f4d9b SPIGOT-5810, SPIGOT-5835: 'Better' handling of Player.isOnGround
53c95627 SPIGOT-5865: Piglin does not trigger EntityPickupItemEvent
2ab04d24 Update ECJ version
7884e079 SPIGOT-5868: Blocks do not tick in custom nether / end
2a848286 SPIGOT-5863: Don't check colour in scoreboard length validation
f2cbce30 SPIGOT-5866: Beehive unknown TargetReason

Spigot Changes:
ad703da0 SPIGOT-5870: /plugins "website" field shows "version"
1a27cfd8 #98: Improve output of /plugins command using text components
732d5bab Disable checkstyle in Spigot blocks
0199a9a6 #97: Add Memory Usage to Ticks Per Second Command.
33ea98fc SPIGOT-5858: NPE: Joining the server with an invalid dimension
2020-06-27 21:54:05 -04:00

138 Zeilen
6.0 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 9 Sep 2018 00:32:05 -0400
Subject: [PATCH] Remove deadlock risk in firing async events
The PluginManager incorrectly used synchronization on firing any event
that was marked as synchronous.
This synchronized did not even protect any concurrency risk as
handlers were already thread safe in terms of mutations during event
dispatch.
The way it was used, has commonly led to deadlocks on the server,
which results in a hard crash.
This change removes the synchronize and adds some protection around enable/disable
diff --git a/src/main/java/org/bukkit/entity/Entity.java b/src/main/java/org/bukkit/entity/Entity.java
index d9922f0777d018f1e6c5673b9fc907fde3fbfa8d..f3dc2f7f45bea1a91171339a5d19461735845aee 100644
--- a/src/main/java/org/bukkit/entity/Entity.java
+++ b/src/main/java/org/bukkit/entity/Entity.java
@@ -28,7 +28,7 @@ import org.jetbrains.annotations.Nullable;
*/
public interface Entity extends Metadatable, CommandSender, Nameable, PersistentDataHolder {
- /**
+ /*
* Gets the entity's current position
*
* @return a new copy of Location containing the position of this entity
diff --git a/src/main/java/org/bukkit/plugin/SimplePluginManager.java b/src/main/java/org/bukkit/plugin/SimplePluginManager.java
index a7393d2830b95d7167121b02066a3f357cee6085..a1a805004941d67abb0b9aa1721e0370c45b5289 100644
--- a/src/main/java/org/bukkit/plugin/SimplePluginManager.java
+++ b/src/main/java/org/bukkit/plugin/SimplePluginManager.java
@@ -462,7 +462,7 @@ public final class SimplePluginManager implements PluginManager {
* @return true if the plugin is enabled, otherwise false
*/
@Override
- public boolean isPluginEnabled(@Nullable Plugin plugin) {
+ public synchronized boolean isPluginEnabled(@Nullable Plugin plugin) { // Paper - synchronize
if ((plugin != null) && (plugins.contains(plugin))) {
return plugin.isEnabled();
} else {
@@ -471,7 +471,7 @@ public final class SimplePluginManager implements PluginManager {
}
@Override
- public void enablePlugin(@NotNull final Plugin plugin) {
+ public synchronized void enablePlugin(@NotNull final Plugin plugin) { // Paper - synchronize
if (!plugin.isEnabled()) {
List<Command> pluginCommands = PluginCommandYamlParser.parse(plugin);
@@ -509,7 +509,7 @@ public final class SimplePluginManager implements PluginManager {
}
@Override
- public void disablePlugin(@NotNull final Plugin plugin, boolean closeClassloader) {
+ public synchronized void disablePlugin(@NotNull final Plugin plugin, boolean closeClassloader) { // Paper - synchronize
// Paper end - close Classloader on disable
if (plugin.isEnabled()) {
try {
@@ -579,6 +579,7 @@ public final class SimplePluginManager implements PluginManager {
defaultPerms.get(false).clear();
}
}
+ private void fireEvent(Event event) { callEvent(event); } // Paper - support old method incase plugin uses reflection
/**
* Calls an event with the given details.
@@ -587,23 +588,13 @@ public final class SimplePluginManager implements PluginManager {
*/
@Override
public void callEvent(@NotNull Event event) {
- if (event.isAsynchronous()) {
- if (Thread.holdsLock(this)) {
- throw new IllegalStateException(event.getEventName() + " cannot be triggered asynchronously from inside synchronized code.");
- }
- if (server.isPrimaryThread()) {
- throw new IllegalStateException(event.getEventName() + " cannot be triggered asynchronously from primary server thread.");
- }
- } else {
- if (!server.isPrimaryThread()) {
- throw new IllegalStateException(event.getEventName() + " cannot be triggered asynchronously from another thread.");
- }
+ // Paper - replace callEvent by merging to below method
+ if (event.isAsynchronous() && server.isPrimaryThread()) {
+ throw new IllegalStateException(event.getEventName() + " may only be triggered asynchronously.");
+ } else if (!event.isAsynchronous() && !server.isPrimaryThread()) {
+ throw new IllegalStateException(event.getEventName() + " may only be triggered synchronously.");
}
- fireEvent(event);
- }
-
- private void fireEvent(@NotNull Event event) {
HandlerList handlers = event.getHandlers();
RegisteredListener[] listeners = handlers.getRegisteredListeners();
diff --git a/src/test/java/org/bukkit/plugin/PluginManagerTest.java b/src/test/java/org/bukkit/plugin/PluginManagerTest.java
index f188cd4f3b07027c30d41f1162db77a506b7b6bb..1941c9f49e9514c1236c5f4ea9f7af47f7be85c5 100644
--- a/src/test/java/org/bukkit/plugin/PluginManagerTest.java
+++ b/src/test/java/org/bukkit/plugin/PluginManagerTest.java
@@ -17,7 +17,7 @@ public class PluginManagerTest {
private static final PluginManager pm = TestServer.getInstance().getPluginManager();
private final MutableObject store = new MutableObject();
-
+/* // Paper start - remove unneeded test
@Test
public void testAsyncSameThread() {
final Event event = new TestEvent(true);
@@ -28,14 +28,14 @@ public class PluginManagerTest {
return;
}
throw new IllegalStateException("No exception thrown");
- }
+ }*/ // Paper end
@Test
public void testSyncSameThread() {
final Event event = new TestEvent(false);
pm.callEvent(event);
}
-
+/* // Paper start - remove unneeded test
@Test
public void testAsyncLocked() throws InterruptedException {
final Event event = new TestEvent(true);
@@ -129,7 +129,7 @@ public class PluginManagerTest {
if (store.value == null) {
throw new IllegalStateException("No exception thrown");
}
- }
+ } */ // Paper
@Test
public void testRemovePermissionByNameLower() {