Michael Ludwig committed 9ccdcfc

Properly add lock when not present.

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Files changed (1)


             // this will either return the newly constructed lock, or 
             // the lock inserted from another thread after we tried to fetch it,
             // in either case, the lock is valid
-            lock = typeLocks.putIfAbsent(id, new ReentrantLock());
+            ReentrantLock newLock = new ReentrantLock();
+            lock = typeLocks.putIfAbsent(id, newLock);
+            if (lock == null) {
+                // newLock was the assigned one
+                lock = newLock;
+            }
         return lock;
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