comment to user-level lock added

bab592c3 · konstantin@oak.local · 84acc205 · bab592c3
Commit bab592c3 authored Dec 04, 2003 by konstantin@oak.local
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sql/sql_class.h sql/sql_class.h +5 -0

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--- a/sql/sql_class.h
+++ b/sql/sql_class.h
@@ -505,6 +505,11 @@ public:
  // TODO: document the variables below
  MYSQL_LOCK	*lock;				/* Current locks */
  MYSQL_LOCK	*locked_tables;			/* Tables locked with LOCK */
+  /*
+    One thread can hold up to one named user-level lock. This variable
+    points to a lock object if the lock is present. See item_func.cc and
+    chapter 'Miscellaneous functions', for functions GET_LOCK, RELEASE_LOCK. 
+  */
  ULL		*ull;
  PREP_STMT	*last_prepared_stmt;
 #ifndef DBUG_OFF