From ddae4c106aef59c35e849b64f02449d65937324e Mon Sep 17 00:00:00 2001
From: Him188 <Him188@mamoe.net>
Date: Sun, 2 Feb 2020 19:56:46 +0800
Subject: [PATCH] Fix concurrent remove

---
 .../kotlin/net.mamoe.mirai/utils/LockFreeLinkedList.kt       | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/LockFreeLinkedList.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/LockFreeLinkedList.kt
index cd5bd161c..80b6c29cc 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/LockFreeLinkedList.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/LockFreeLinkedList.kt
@@ -132,7 +132,10 @@ open class LockFreeLinkedList<E> {
             if (toRemove.isRemoved()) {
                 continue
             }
-            toRemove.removed.value = true // logically remove: all the operations will recognize this node invalid
+            if (!toRemove.removed.compareAndSet(false, true)) {
+                // logically remove: all the operations will recognize this node invalid
+                continue
+            }
 
 
             // physically remove: try to fix the link