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.


mysql-test/r/events.result:
  update result
mysql-test/r/events_bugs.result:
  update result
mysql-test/r/events_logs_tests.result:
  update result
mysql-test/r/events_restart_phase1.result:
  update result
mysql-test/r/events_restart_phase3.result:
  update result
mysql-test/r/events_scheduling.result:
  update result
mysql-test/r/events_stress.result:
  update result
mysql-test/t/events.test:
  update test:
  2 -> off
  1 -> on
mysql-test/t/events_bugs.test:
  update test:
  2 -> off
  1 -> on
mysql-test/t/events_logs_tests.test:
  update test:
  2 -> off
  1 -> on
mysql-test/t/events_restart_phase1.test:
  update test:
  2 -> off
  1 -> on
mysql-test/t/events_restart_phase2-master.opt:
  update master file : 1 => on
mysql-test/t/events_scheduling.test:
  update test:
  2 -> off
  1 -> on
  
  add tests for event_scheduler global variable representation from
  SHOW VARIABLES.
mysql-test/t/events_stress.test:
  update test:
  2 -> off
  1 -> on
sql/events.cc:
  Implement two different TYPELIBs for --event-scheduler cmd line
  option and for GLOBAL variable event_scheduler
  
  --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.
sql/events.h:
  additional TYPELIB for GLOBAL event_scheduler
sql/mysqld.cc:
  --event-scheduler should be checked against a TYPELIB and
  therefore should be GET_STR, as well as we make the parameter optional.
  When not provided OFF|0 is used.
sql/set_var.cc:
  Implement typelib for event_scheduler variable.
  If allows both INT_RESULT -> 0 | 1 
  and STRING_RESULT -> OFF | ON
  The variable is shown as DISABLED | ON | OFF
sql/set_var.h:
  Implement typelib, which expects both STRING and INT,
  for event_scheduler.

1 files changed, 24 insertions, 11 deletions

diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index 58697202461..b8626623b59 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -5072,9 +5072,9 @@ Disable with --skip-bdb (will save memory).",
    (gptr*) &global_system_variables.engine_condition_pushdown,
    (gptr*) &global_system_variables.engine_condition_pushdown,
    0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
+  /* See how it's handled in get_one_option() */
   {"event-scheduler", OPT_EVENT_SCHEDULER, "Enable/disable the event scheduler.",
-   (gptr*) &Events::opt_event_scheduler, (gptr*) &Events::opt_event_scheduler, 0, GET_ULONG,
-    REQUIRED_ARG, 2/*default*/, 0/*min-value*/, 2/*max-value*/, 0, 0, 0},
+   NULL,  NULL, 0, GET_STR, OPT_ARG, 0, 0, 0, 0, 0, 0},
   {"exit-info", 'T', "Used for debugging;  Use at your own risk!", 0, 0, 0,
    GET_LONG, OPT_ARG, 0, 0, 0, 0, 0, 0},
   {"external-locking", OPT_USE_LOCKING, "Use system (external) locking (disabled by default).  With this option enabled you can run myisamchk to test (not repair) tables while the MySQL server is running. Disable with --skip-external-locking.",
@@ -7423,20 +7423,33 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
 #endif
   case OPT_EVENT_SCHEDULER:
     if (!argument)
-      Events::opt_event_scheduler= 2;
+      Events::opt_event_scheduler= Events::EVENTS_DISABLED;
     else
     {
       int type;
-      if ((type=find_type(argument, &Events::opt_typelib, 1)) <= 0)
-      {
-	fprintf(stderr,"Unknown option to event-scheduler: %s\n",argument);
-	exit(1);
-      }
       /* 
-        type=  1     2      3   4     5    6
-             (OFF |  0) - (ON | 1) - (2 | SUSPEND)
+        type=     5          1   2      3   4
+             (DISABLE ) - (OFF | ON) - (0 | 1)
       */
-      Events::opt_event_scheduler= (type-1) / 2;
+      switch ((type=find_type(argument, &Events::opt_typelib, 1))) {
+      case 0:
+	fprintf(stderr, "Unknown option to event-scheduler: %s\n",argument);
+	exit(1);
+      case 5: /* OPT_DISABLED */
+        Events::opt_event_scheduler= Events::EVENTS_DISABLED;
+        break;
+      case 2: /* OPT_ON  */
+      case 4: /* 1   */
+        Events::opt_event_scheduler= Events::EVENTS_ON;
+        break;
+      case 1: /* OPT_OFF */
+      case 3: /*  0  */
+        Events::opt_event_scheduler= Events::EVENTS_OFF;
+        break;
+      default:
+        DBUG_ASSERT(0);
+        unireg_abort(1);
+      }
     }
     break;
   case (int) OPT_SKIP_NEW: