#4761 hold the lock tree manager mutex and the lock tree mutex when doing lock...

#4761 hold the lock tree manager mutex and the lock tree mutex when doing lock escalation refs[t:4761]

git-svn-id: file:///svn/toku/tokudb@42329 c7de825b-a66e-492c-adef-691d508d4ae1

src/lock_tree/locktree.h

@@ -75,9 +75,11 @@ struct __toku_lock_tree {
     DICTIONARY_ID      dict_id;
     OMT                dbs; //The extant dbs using this lock tree.
     OMT                lock_requests;
-    toku_pthread_mutex_t mutex;
     toku_rth*          txns_to_unlock; // set of txn's that could not release their locks because there was no db for the comparison function
 
+    toku_pthread_mutex_t mutex;
+    bool mutex_locked;
+
     /** A temporary area where we store the results of various find on 
         the range trees that this lock tree owns 
     Memory ownership: 
@@ -149,6 +151,8 @@ struct __toku_ltm {
     int               (*panic)(DB*, int);
 
     toku_pthread_mutex_t mutex;
+    bool mutex_locked;
+
     struct timeval lock_wait_time;
 };