From 49df44ad6c4625301b32762d059936c0aeb42d25 Mon Sep 17 00:00:00 2001
From: EvilSeph <evilseph@unaligned.org>
Date: Thu, 30 Jun 2011 02:18:11 -0400
Subject: Possible fix for cancelled CraftScheduler tasks still running.

---
 .../craftbukkit/scheduler/CraftScheduler.java      | 37 ++++++++++++++++++----
 1 file changed, 31 insertions(+), 6 deletions(-)

diff --git a/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java b/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java
index d2cd7ad0..02066909 100644
--- a/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java
+++ b/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java
@@ -253,15 +253,40 @@ public class CraftScheduler implements BukkitScheduler, Runnable {
     }
 
     public void cancelTask(int taskId) {
-        synchronized (schedulerQueue) {
-            Iterator<CraftTask> itr = schedulerQueue.keySet().iterator();
-            while (itr.hasNext()) {
-                CraftTask current = itr.next();
-                if (current.getIdNumber() == taskId) {
-                    itr.remove();
+        syncedTasksLock.lock();
+        try {
+            synchronized (schedulerQueue) {
+                mainThreadLock.lock();
+                try {
+                    Iterator<CraftTask> itr = schedulerQueue.keySet().iterator();
+                    while (itr.hasNext()) {
+                        CraftTask current = itr.next();
+                        if (current.getIdNumber() == taskId) {
+                            itr.remove();
+                        }
+                    }
+                    itr = mainThreadQueue.iterator();
+                    while (itr.hasNext()) {
+                        CraftTask current = itr.next();
+                        if (current.getIdNumber() == taskId) {
+                            itr.remove();
+                        }
+                    }
+                    itr = syncedTasks.iterator();
+                    while (itr.hasNext()) {
+                        CraftTask current = itr.next();
+                        if (current.getIdNumber() == taskId) {
+                            itr.remove();
+                        }
+                    }
+                } finally {
+                    mainThreadLock.unlock();
                 }
             }
+        } finally {
+            syncedTasksLock.unlock();
         }
+
         craftThreadManager.interruptTask(taskId);
     }
 
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