WL#3337 (Event scheduler new architecture)

Remove SHOW SCHEDULER STATUS command and migrate the
information output to `mysqladmin debug` (COM_DEBUG)

SHOW SCHEDULER STATUS was introduced in 5.1.11, provided
some debug information about event scheduler internals and
was enabled only in debug builds.

sql/event_queue.cc

@@ -907,7 +907,7 @@ Event_queue::cond_wait(THD *thd, struct timespec *abstime, const char* msg,
     do but we need to obey cond_wait()
   */
   thd->exit_cond("");
-  LOCK_QUEUE_DATA();
+  lock_data(func, line);
 
   DBUG_VOID_RETURN;
 }
@@ -918,102 +918,31 @@ Event_queue::cond_wait(THD *thd, struct timespec *abstime, const char* msg,
 
   SYNOPSIS
     Event_queue::dump_internal_status()
-      thd  Thread
-
-  RETURN VALUE
-    FALSE  OK
-    TRUE   Error
 */
 
-bool
-Event_queue::dump_internal_status(THD *thd)
+void
+Event_queue::dump_internal_status()
 {
   DBUG_ENTER("Event_queue::dump_internal_status");
-#ifndef DBUG_OFF
-  CHARSET_INFO *scs= system_charset_info;
-  Protocol *protocol= thd->protocol;
-  List<Item> field_list;
-  int ret;
-  char tmp_buff[5*STRING_BUFFER_USUAL_SIZE];
-  char int_buff[STRING_BUFFER_USUAL_SIZE];
-  String tmp_string(tmp_buff, sizeof(tmp_buff), scs);
-  String int_string(int_buff, sizeof(int_buff), scs);
-  tmp_string.length(0);
-  int_string.length(0);
-
-  /* workers_count */
-  protocol->prepare_for_resend();
-  protocol->store(STRING_WITH_LEN("queue element count"), scs);
-  int_string.set((longlong) queue.elements, scs);
-  protocol->store(&int_string);
-  ret= protocol->write();
-
-  /* queue_data_locked */
-  protocol->prepare_for_resend();
-  protocol->store(STRING_WITH_LEN("queue data locked"), scs);
-  int_string.set((longlong) mutex_queue_data_locked, scs);
-  protocol->store(&int_string);
-  ret= protocol->write();
-
-  /* queue_data_attempting_lock */
-  protocol->prepare_for_resend();
-  protocol->store(STRING_WITH_LEN("queue data attempting lock"), scs);
-  int_string.set((longlong) mutex_queue_data_attempting_lock, scs);
-  protocol->store(&int_string);
-  ret= protocol->write();
-
-  /* last locked at*/
-  protocol->prepare_for_resend();
-  protocol->store(STRING_WITH_LEN("queue last locked at"), scs);
-  tmp_string.length(scs->cset->snprintf(scs, (char*) tmp_string.ptr(),
-                                        tmp_string.alloced_length(), "%s::%d",
-                                        mutex_last_locked_in_func,
-                                        mutex_last_locked_at_line));
-  protocol->store(&tmp_string);
-  ret= protocol->write();
-
-  /* last unlocked at*/
-  protocol->prepare_for_resend();
-  protocol->store(STRING_WITH_LEN("queue last unlocked at"), scs);
-  tmp_string.length(scs->cset->snprintf(scs, (char*) tmp_string.ptr(),
-                                        tmp_string.alloced_length(), "%s::%d",
-                                        mutex_last_unlocked_in_func,
-                                        mutex_last_unlocked_at_line));
-  protocol->store(&tmp_string);
-  ret= protocol->write();
-
-  /* last attempted lock  at*/
-  protocol->prepare_for_resend();
-  protocol->store(STRING_WITH_LEN("queue last attempted lock at"), scs);
-  tmp_string.length(scs->cset->snprintf(scs, (char*) tmp_string.ptr(),
-                                        tmp_string.alloced_length(), "%s::%d",
-                                        mutex_last_attempted_lock_in_func,
-                                        mutex_last_attempted_lock_at_line));
-  protocol->store(&tmp_string);
-  ret= protocol->write();
-
-  /* waiting on */
-  protocol->prepare_for_resend();
-  protocol->store(STRING_WITH_LEN("queue waiting on condition"), scs);
-  int_string.set((longlong) waiting_on_cond, scs);
-  protocol->store(&int_string);
-  ret= protocol->write();
-
-  protocol->prepare_for_resend();
-  protocol->store(STRING_WITH_LEN("next activation at"), scs);
-  tmp_string.length(scs->cset->snprintf(scs, (char*) tmp_string.ptr(),
-                                        tmp_string.alloced_length(),
-                                        "%4d-%02d-%02d %02d:%02d:%02d",
-                                        next_activation_at.year,
-                                        next_activation_at.month,
-                                        next_activation_at.day,
-                                        next_activation_at.hour,
-                                        next_activation_at.minute,
-                                        next_activation_at.second
-                                        ));
-  protocol->store(&tmp_string);
-  ret= protocol->write();
 
-#endif
-  DBUG_RETURN(FALSE);
+  /* element count */
+  puts("");
+  puts("Event queue status:");
+  printf("Element count   : %u\n", queue.elements);
+  printf("Data locked     : %s\n", mutex_queue_data_locked? "YES":"NO");
+  printf("Attempting lock : %s\n", mutex_queue_data_attempting_lock? "YES":"NO");
+  printf("LLA             : %s:%u\n", mutex_last_locked_in_func,
+                                        mutex_last_locked_at_line);
+  printf("LUA             : %s:%u\n", mutex_last_unlocked_in_func,
+                                        mutex_last_unlocked_at_line);
+  if (mutex_last_attempted_lock_at_line)
+    printf("Last lock attempt at: %s:%u\n", mutex_last_attempted_lock_in_func,
+                                            mutex_last_attempted_lock_at_line);
+  printf("WOC             : %s\n", waiting_on_cond? "YES":"NO");
+  printf("Next activation : %04d-%02d-%02d %02d:%02d:%02d\n",
+         next_activation_at.year, next_activation_at.month,
+         next_activation_at.day, next_activation_at.hour,
+         next_activation_at.minute, next_activation_at.second);
+
+  DBUG_VOID_RETURN;
 }

sql/event_queue.h

@@ -61,8 +61,9 @@ class Event_queue
 
   bool
   get_top_for_execution_if_time(THD *thd, Event_job_data **job_data);
-  bool
-  dump_internal_status(THD *thd);
+
+  void
+  dump_internal_status();
 
   int
   load_events_from_db(THD *thd);

sql/event_scheduler.cc

@@ -38,6 +38,7 @@ extern pthread_attr_t connection_attrib;
 static
 const LEX_STRING scheduler_states_names[] =
 {
+  { C_STRING_WITH_LEN("UNINITIALIZED") },
   { C_STRING_WITH_LEN("INITIALIZED") },
   { C_STRING_WITH_LEN("RUNNING") },
   { C_STRING_WITH_LEN("STOPPING") }
@@ -757,106 +758,25 @@ Event_scheduler::cond_wait(THD *thd, struct timespec *abstime, const char* msg,
 
   SYNOPSIS
     Event_scheduler::dump_internal_status()
-      thd  Thread
-
-  RETURN VALUE
-    FALSE  OK
-    TRUE   Error
 */
 
-bool
-Event_scheduler::dump_internal_status(THD *thd)
+void
+Event_scheduler::dump_internal_status()
 {
-  int ret= 0;
   DBUG_ENTER("Event_scheduler::dump_internal_status");
 
-#ifndef DBUG_OFF
-  CHARSET_INFO *scs= system_charset_info;
-  Protocol *protocol= thd->protocol;
-  char tmp_buff[5*STRING_BUFFER_USUAL_SIZE];
-  char int_buff[STRING_BUFFER_USUAL_SIZE];
-  String tmp_string(tmp_buff, sizeof(tmp_buff), scs);
-  String int_string(int_buff, sizeof(int_buff), scs);
-  tmp_string.length(0);
-  int_string.length(0);
-
-  do
-  {
-    protocol->prepare_for_resend();
-    protocol->store(STRING_WITH_LEN("scheduler state"), scs);
-    protocol->store(scheduler_states_names[state].str,
-                    scheduler_states_names[state].length, scs);
-
-    if ((ret= protocol->write()))
-      break;
-
-    /* thread_id */
-    protocol->prepare_for_resend();
-    protocol->store(STRING_WITH_LEN("thread_id"), scs);
-    if (thread_id)
-    {
-      int_string.set((longlong) scheduler_thd->thread_id, scs);
-      protocol->store(&int_string);
-    }
-    else
-      protocol->store_null();
-    if ((ret= protocol->write()))
-      break;
-
-    /* last locked at*/
-    protocol->prepare_for_resend();
-    protocol->store(STRING_WITH_LEN("scheduler last locked at"), scs);
-    tmp_string.length(scs->cset->snprintf(scs, (char*) tmp_string.ptr(),
-                                          tmp_string.alloced_length(), "%s::%d",
-                                          mutex_last_locked_in_func,
-                                          mutex_last_locked_at_line));
-    protocol->store(&tmp_string);
-    if ((ret= protocol->write()))
-      break;
-
-    /* last unlocked at*/
-    protocol->prepare_for_resend();
-    protocol->store(STRING_WITH_LEN("scheduler last unlocked at"), scs);
-    tmp_string.length(scs->cset->snprintf(scs, (char*) tmp_string.ptr(),
-                                          tmp_string.alloced_length(), "%s::%d",
-                                          mutex_last_unlocked_in_func,
-                                          mutex_last_unlocked_at_line));
-    protocol->store(&tmp_string);
-    if ((ret= protocol->write()))
-      break;
-
-    /* waiting on */
-    protocol->prepare_for_resend();
-    protocol->store(STRING_WITH_LEN("scheduler waiting on condition"), scs);
-    int_string.set((longlong) waiting_on_cond, scs);
-    protocol->store(&int_string);
-    if ((ret= protocol->write()))
-      break;
-
-    /* workers_count */
-    protocol->prepare_for_resend();
-    protocol->store(STRING_WITH_LEN("scheduler workers count"), scs);
-    int_string.set((longlong) workers_count(), scs);
-    protocol->store(&int_string);
-    if ((ret= protocol->write()))
-      break;
-
-    /* workers_count */
-    protocol->prepare_for_resend();
-    protocol->store(STRING_WITH_LEN("scheduler executed events"), scs);
-    int_string.set((longlong) started_events, scs);
-    protocol->store(&int_string);
-    if ((ret= protocol->write()))
-      break;
+  puts("");
+  puts("Event scheduler status:");
+  printf("State      : %s\n", scheduler_states_names[state].str);
+  printf("Thread id  : %lu\n", scheduler_thd? scheduler_thd->thread_id : 0);
+  printf("LLA        : %s:%u\n", mutex_last_locked_in_func,
+                                 mutex_last_locked_at_line);
+  printf("LUA        : %s:%u\n", mutex_last_unlocked_in_func,
+                                 mutex_last_unlocked_at_line);
+  printf("WOC        : %s\n", waiting_on_cond? "YES":"NO");
+  printf("Workers    : %u\n", workers_count());
+  printf("Executed   : %llu\n", started_events);
+  printf("Data locked: %s\n", mutex_scheduler_data_locked ? "YES":"NO");
 
-    /* scheduler_data_locked */
-    protocol->prepare_for_resend();
-    protocol->store(STRING_WITH_LEN("scheduler data locked"), scs);
-    int_string.set((longlong) mutex_scheduler_data_locked, scs);
-    protocol->store(&int_string);
-    ret= protocol->write();
-  } while (0);
-#endif
-
-  DBUG_RETURN(ret);
+  DBUG_VOID_RETURN;
 }

sql/event_scheduler.h

@@ -65,8 +65,8 @@ class Event_scheduler
   bool
   is_running();
 
-  bool
-  dump_internal_status(THD *thd);
+  void
+  dump_internal_status();
 
 private:
   uint

sql/events.cc

@@ -744,32 +744,20 @@ Events::destroy_mutexes()
 
   SYNOPSIS
     Events::dump_internal_status()
-      thd  Thread
-
-  RETURN VALUE
-    FALSE  OK
-    TRUE   Error
 */
 
-bool
-Events::dump_internal_status(THD *thd)
+void
+Events::dump_internal_status()
 {
   DBUG_ENTER("Events::dump_internal_status");
-  Protocol *protocol= thd->protocol;
-  List<Item> field_list;
+  puts("\n\n\nEvents status:");
+  puts("LLA = Last Locked At  LUA = Last Unlocked At");
+  puts("WOC = Waiting On Condition  DL = Data Locked");
 
-  field_list.push_back(new Item_empty_string("Name", 30));
-  field_list.push_back(new Item_empty_string("Value",20));
-  if (protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS |
-                                         Protocol::SEND_EOF))
-    DBUG_RETURN(TRUE);
-
-  if (scheduler->dump_internal_status(thd) ||
-      event_queue->dump_internal_status(thd))
-    DBUG_RETURN(TRUE);
+  scheduler->dump_internal_status();
+  event_queue->dump_internal_status();
 
-  send_eof(thd);
-  DBUG_RETURN(FALSE);
+  DBUG_VOID_RETURN;
 }
 
 

sql/events.h

@@ -112,8 +112,8 @@ class Events
   static int
   fill_schema_events(THD *thd, TABLE_LIST *tables, COND * /* cond */);
 
-  bool
-  dump_internal_status(THD *thd);
+  void
+  dump_internal_status();
 
 private:
   bool

sql/lex.h

@@ -452,7 +452,6 @@ static SYMBOL symbols[] = {
   { "RTREE",		SYM(RTREE_SYM)},
   { "SAVEPOINT",	SYM(SAVEPOINT_SYM)},
   { "SCHEDULE",		SYM(SCHEDULE_SYM)},
-  { "SCHEDULER",	SYM(SCHEDULER_SYM)},
   { "SCHEMA",		SYM(DATABASE)},
   { "SCHEMAS",          SYM(DATABASES)},
   { "SECOND",		SYM(SECOND_SYM)},

sql/sp_head.cc

@@ -196,7 +196,6 @@ sp_get_flags_for_command(LEX *lex)
   case SQLCOM_SHOW_PRIVILEGES:
   case SQLCOM_SHOW_PROCESSLIST:
   case SQLCOM_SHOW_PROC_CODE:
-  case SQLCOM_SHOW_SCHEDULER_STATUS:
   case SQLCOM_SHOW_SLAVE_HOSTS:
   case SQLCOM_SHOW_SLAVE_STAT:
   case SQLCOM_SHOW_STATUS:

sql/sql_lex.h

@@ -113,7 +113,6 @@ enum enum_sql_command {
   SQLCOM_SHOW_CONTRIBUTORS,
   SQLCOM_CREATE_EVENT, SQLCOM_ALTER_EVENT, SQLCOM_DROP_EVENT,
   SQLCOM_SHOW_CREATE_EVENT, SQLCOM_SHOW_EVENTS, 
-  SQLCOM_SHOW_SCHEDULER_STATUS,
 
   /* This should be the last !!! */
 

sql/sql_parse.cc

@@ -3960,13 +3960,6 @@ mysql_execute_command(THD *thd)
     }
     break;
   }
-#ifndef DBUG_OFF
-  case SQLCOM_SHOW_SCHEDULER_STATUS:
-  {
-    res= Events::get_instance()->dump_internal_status(thd);
-    break;
-  }
-#endif
   case SQLCOM_CREATE_FUNCTION:                  // UDF function
   {
     if (check_access(thd,INSERT_ACL,"mysql",0,1,0,0))

sql/sql_test.cc

@@ -28,6 +28,8 @@
 #include <sys/malloc.h>
 #endif
 
+#include "events.h"
+
 static const char *lock_descriptions[] =
 {
   "No lock",
@@ -532,5 +534,7 @@ Estimated memory (with thread stack):    %ld\n",
 	 (int) info.keepcost,
 	 (long) (thread_count * thread_stack + info.hblkhd + info.arena));
 #endif
+
+  Events::get_instance()->dump_internal_status();
   puts("");
 }

sql/sql_yacc.yy

@@ -590,7 +590,6 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 %token  RTREE_SYM
 %token  SAVEPOINT_SYM
 %token  SCHEDULE_SYM
-%token  SCHEDULER_SYM
 %token  SECOND_MICROSECOND_SYM
 %token  SECOND_SYM
 %token  SECURITY_SYM
@@ -8112,15 +8111,6 @@ show_param:
              if (prepare_schema_table(YYTHD, lex, 0, SCH_EVENTS))
                YYABORT;
            }
-         | SCHEDULER_SYM STATUS_SYM
-           {
-#ifndef DBUG_OFF
-             Lex->sql_command= SQLCOM_SHOW_SCHEDULER_STATUS;
-#else
-             yyerror(ER(ER_SYNTAX_ERROR));
-             YYABORT;           
-#endif
-           }         
          | TABLE_SYM STATUS_SYM opt_db wild_and_where
            {
              LEX *lex= Lex;
@@ -9503,7 +9493,6 @@ keyword_sp:
 	| ROW_SYM		{}
 	| RTREE_SYM		{}
 	| SCHEDULE_SYM		{}	
-	| SCHEDULER_SYM		{}	
 	| SECOND_SYM		{}
 	| SERIAL_SYM		{}
 	| SERIALIZABLE_SYM	{}