Fixing potential concurrency issue with creating the actionQueue

phlipper · Oct 10, 2012 · 52139bd · 52139bd
1 parent 343b027
commit 52139bd
Showing 1 changed file with 4 additions and 3 deletions.
diff --git a/MagicalRecord/Core/MagicalRecord+Actions.m b/MagicalRecord/Core/MagicalRecord+Actions.m
@@ -13,10 +13,11 @@
 dispatch_queue_t action_queue(void);
 dispatch_queue_t action_queue(void)
 {
-    if (background_action_queue == NULL)
-    {
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
         background_action_queue = dispatch_queue_create("com.magicalpanda.magicalrecord.actionQueue", DISPATCH_QUEUE_SERIAL);
-    }
+    });
+
     return background_action_queue;
 }