WL#3337 (Event scheduler new architecture)

This is a post-review patch.

Fixes the typelib implementation, available only in 5.1.11.

--event-scheduler cmdline : DISABLED | ON | OFF | 0 | 1
DISABLED - makes the scheduler unavailable during the server run
(ON|1)-  When the server is started the scheduler will be started. It can
         be stopped and restarted by setting appropriate values to
         GLOBAL event_scheduler
(OFF|0)- When the server is started, the scheduler won't be started. It
         can be started and again stopped by setting appropriate values to
         GLOBAL event_scheduler. _DEFAULT_ value

The GLOBAL variable event_scheduler can have the following values:
OFF | ON | 0 | 1
DISABLED is not possible and every attempt will end with an error that
it's not a valid value for the variable.
OFF | 0 - This is the pre-5.1.11 behavior - The scheduler stops, if not
          already stopped, and can be started again  by setting
          the value of the variable to ON|1.
ON | 1  - This is the pre-5.1.11 behavior - The scheduler starts, if not
          already started, and can be stopped again by setting the value
          of the variable to OFF|0.

1 files changed, 11 insertions, 2 deletions

diff --git a/sql/events.h b/sql/events.h
index 737044ad298..9a820b8521e 100644
--- a/sql/events.h
+++ b/sql/events.h
@@ -48,9 +48,18 @@ public:
     or other scheme will be found.
   */
   friend class Event_queue_element;
-
-  static ulong opt_event_scheduler;
+  
+  /* The order should match the order in opt_typelib */
+  enum enum_opt_event_scheduler
+  {
+    EVENTS_OFF= 0,
+    EVENTS_ON= 1,
+    EVENTS_DISABLED= 5,
+  };
+
+  static enum_opt_event_scheduler opt_event_scheduler;
   static TYPELIB opt_typelib;
+  static TYPELIB var_typelib;
 
   bool
   init();