1 files changed, 22 insertions, 0 deletions
diff --git a/sql/set_var.h b/sql/set_var.h
index f43d3b75cee..5fb883e8b86 100644
--- a/sql/set_var.h
+++ b/sql/set_var.h
@@ -873,6 +873,28 @@ public:
   byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
 };
 
+
+/**
+ * @brief This is a specialization of sys_var_thd_ulong that implements a 
+   read-only session variable. The class overrides check() and check_default() 
+   to achieve the read-only property for the session part of the variable.
+ */
+class sys_var_thd_ulong_session_readonly : public sys_var_thd_ulong
+{
+public:
+  sys_var_thd_ulong_session_readonly(const char *name_arg, ulong SV::*offset_arg, 
+				     sys_check_func c_func= NULL,
+                                     sys_after_update_func au_func= NULL): 
+    sys_var_thd_ulong(name_arg, offset_arg, c_func, au_func)
+  { }
+  bool check(THD *thd, set_var *var);
+  bool check_default(enum_var_type type)
+  {
+    return type != OPT_GLOBAL || !option_limits;
+  }
+};
+
+
 class sys_var_trust_routine_creators :public sys_var_bool_ptr
 {
   /* We need a derived class only to have a warn_deprecated() */