+ //\r
+ // Aquire lock to prevent reentrance from TPL_CALLBACK level\r
+ //\r
+ EfiAcquireLock (&mPcdDatabaseLock);\r
+\r
+ Status = DxeRegisterCallBackWorker (TokenNumber, Guid, CallBackFunction);\r
+\r
+ EfiReleaseLock (&mPcdDatabaseLock);\r
+ \r
+ return Status;\r