--- a/src/hotspot/share/runtime/mutexLocker.hpp	Wed Sep 25 12:21:10 2019 +0200
+++ b/src/hotspot/share/runtime/mutexLocker.hpp	Wed Sep 25 11:10:05 2019 -0700
@@ -115,6 +115,7 @@
 extern Monitor* PeriodicTask_lock;               // protects the periodic task structure
 extern Monitor* RedefineClasses_lock;            // locks classes from parallel redefinition
 extern Monitor* ThreadsSMRDelete_lock;           // Used by ThreadsSMRSupport to take pressure off the Threads_lock
+extern Mutex*   ThreadIdTableCreate_lock;        // Used by ThreadIdTable to lazily create the thread id table
 extern Mutex*   SharedDecoder_lock;              // serializes access to the decoder during normal (not error reporting) use
 extern Mutex*   DCmdFactory_lock;                // serialize access to DCmdFactory information
 #if INCLUDE_NMT