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Remove deadlock risk in firing async events

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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
This commit is contained in:
Aikar
2018-09-09 01:04:29 -04:00
parent 4ff931a021
commit 68b25624d8
6 changed files with 111 additions and 30 deletions
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2
Spigot-API-Patches/Add-source-block-to-BlockPhysicsEvent.patch
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@@ -5,7 +5,7 @@ Subject: [PATCH] Add source block to BlockPhysicsEvent
diff --git a/src/main/java/org/bukkit/event/block/BlockPhysicsEvent.java b/src/main/java/org/bukkit/event/block/BlockPhysicsEvent.java
index 01a545b4..d17e05ac 100644
index 01a545b42..57568cd02 100644
--- a/src/main/java/org/bukkit/event/block/BlockPhysicsEvent.java
+++ b/src/main/java/org/bukkit/event/block/BlockPhysicsEvent.java
@@ -0,0 +0,0 @@ public class BlockPhysicsEvent extends BlockEvent implements Cancellable {