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fix for bug #17619 Scheduler race conditions

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- Scheduler is either initialized at server start or never.
  Starting & stopping is now suspending & resuming.
- The scheduler has clear OO interface
- Now all calls to the scheduler are synchronous
- GLOBAL event_scheduler uses thd::sys_var_tmp (see set_var.cc)
- External API is encapsulated into class Events
- Includes fixes for all comments of Kostja's review of 19.05.2005

Starting to merge into 5.1-release (5.1.10) and push


BitKeeper/etc/ignore:
  Added libmysqld/event_scheduler.cc to the ignore list
libmysqld/Makefile.am:
  executor -> scheduler
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_microsec.result:
  update result
mysql-test/r/events_scheduling.result:
  update result
mysql-test/r/events_stress.result:
  update result
mysql-test/t/disabled.def:
  enable these tests
mysql-test/t/events.test:
  optimize the test a bit for speed, save some seconds runtime
  remove FULL from SHOW EVENTS
  mostly use I_S.EVENTS
mysql-test/t/events_bugs.test:
  Skip irrelevant for the current design tests - all events are loaded
  on server startup. Change in mysql.event will be visible on next server start.
  Don't use numeric error codes.
mysql-test/t/events_logs_tests.test:
  optimize the test a bit for speed
mysql-test/t/events_microsec.test:
   Skip irrelevant for the current design tests - all events are loaded
      on server startup. Change in mysql.event will be visible on next server start.
      Don't use numeric error codes.
mysql-test/t/events_scheduling.test:
  broader test
mysql-test/t/events_stress.test:
  Rework the test to the new architecture of suspending/resuming.
  Use less events, no need for thousands, hundreds is still ok.
sql/Makefile.am:
  executor -> scheduler
sql/cmakelists.txt:
  executor -> scheduler
sql/event.cc:
  - remove todo comments
  - remove unneded evex_queue abstraction functions
  - move events_init() and events_shutdown() from event_executor.cc to here
  - export db_create_event
  - remove evex_load_and_compile_event, part of class Event_scheduler
  - integrate the public interface found in event.h and used by sql_parse.cc
    to use the new class Event_scheduler.
sql/event.h:
  - add COND_finished so if one thread kills a running event it waits on this
  - export callback event_timed_definer_equal, event_timed_identifier_equal(),
    event_timed_name_equal and event_timed_db_equal()
    to be used by Event_scheduler::drop_matching_events()
  - cleanup event.h
  - encapsulated all external interface into class Events
sql/event_executor.cc:
  make it empty, will delete after that
sql/event_priv.h:
  - more things in the private header
  - remove event queue abstraction functions. tightly bind to QUEUE
  - export privately db_drop_event, db_find_event, db_create_event()
  - made change_security_context() and restore_security_context() free functions
sql/event_timed.cc:
  - fix calculation of time when ENDS is set (STARTS is always set)
  - during Event_timed::compile() set the right Security_ctx. Prevents a crash
        during Event_scheduler::load_events_from_db()
  - add Event_timed::kill_thread()
  - implement event_timed_*_equal()
  - made change_security_context() and restore_security_context() free functions.
  - Comments cleanups
sql/lex.h:
  new word scheduler for SHOW SCHEDULER STATUS (available only debug builds)
sql/log.cc:
  move these from event_scheduler.cc
sql/mysql_priv.h:
  refactor kill_one_thread
  export sql_print_message_func and sql_print_message_handlers
sql/mysqld.cc:
  In close_connections, called by kill_server() skip the main scheduler
  thread and use events_shutdown() for shutting down the scheduler, in the same
  manner it's done for RPL.
  Add a new value to --event-scheduler :
  0 <- No scheduler available
  1 <- Start with scheduler enabled
  2 <- Start with scheduler suspended
sql/repl_failsafe.cc:
  refactor thd::system_thread to be an enum
sql/set_var.cc:
  move sys_var_event_executor::update() to set_var.cc
  executor -> scheduler
  use thd::sys_var_tmp
sql/set_var.h:
  executor -> scheduler
sql/share/errmsg.txt:
  3 new error messages
sql/sql_class.cc:
  refactor thd::system_thread to be an enum . more type-safety
sql/sql_class.h:
  refactor thd::system_thread to be an enum . more type-safety
sql/sql_db.cc:
  get the error from evex_drop_schema_events
sql/sql_error.h:
  export warning_level_names
sql/sql_lex.h:
  new command SHOW SCHEDULER STATUS, available only in debug build and
  for debug purposes.
sql/sql_parse.cc:
  refactor kill_one_thread() -> does the *dirty* work, and sql_kill
  just the reporting.
  add handler for SQLCOM_SHOW_SCHEDULER_STATUS
sql/sql_show.cc:
  fix verbosity handling (this will be obsoleted anyway by the fix for 17394).
sql/sql_yacc.yy:
  remove FULL from SHOW EVENTS
  add SHOW SCHEDULER STATUS in debug builds
sql/table.cc:
  Fix valgrind warning.
This commit is contained in:
unknown
2006-05-22 20:46:13 +02:00
parent 61bd3fa055
commit f4781a7e4c
41 changed files with 4129 additions and 2369 deletions
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27
sql/sql_show.cc
View File

@ -4049,8 +4049,9 @@ fill_events_copy_to_schema_table(THD *thd, TABLE *sch_table, TABLE *event_table)
/* type */
sch_table->field[5]->store(STRING_WITH_LEN("RECURRING"), scs);
if (event_reconstruct_interval_expression(&show_str, et.interval,
et.expression))
if (Events::reconstruct_interval_expression(&show_str,
et.interval,
et.expression))
DBUG_RETURN(1);
sch_table->field[7]->set_notnull();
@ -4080,13 +4081,13 @@ fill_events_copy_to_schema_table(THD *thd, TABLE *sch_table, TABLE *event_table)
}
//status
if (et.status == MYSQL_EVENT_ENABLED)
if (et.status == Event_timed::ENABLED)
sch_table->field[12]->store(STRING_WITH_LEN("ENABLED"), scs);
else
sch_table->field[12]->store(STRING_WITH_LEN("DISABLED"), scs);
//on_completion
if (et.on_completion == MYSQL_EVENT_ON_COMPLETION_DROP)
if (et.on_completion == Event_timed::ON_COMPLETION_DROP)
sch_table->field[13]->store(STRING_WITH_LEN("NOT PRESERVE"), scs);
else
sch_table->field[13]->store(STRING_WITH_LEN("PRESERVE"), scs);
@ -4138,7 +4139,7 @@ int fill_schema_events(THD *thd, TABLE_LIST *tables, COND *cond)
thd->reset_n_backup_open_tables_state(&backup);
if ((ret= evex_open_event_table(thd, TL_READ, &event_table)))
if ((ret= Events::open_event_table(thd, TL_READ, &event_table)))
{
sql_print_error("Table mysql.event is damaged.");
ret= 1;
@ -4147,13 +4148,10 @@ int fill_schema_events(THD *thd, TABLE_LIST *tables, COND *cond)
event_table->file->ha_index_init(0, 1);
/*
see others' events only if you have PROCESS_ACL !!
thd->lex->verbose is set either if SHOW FULL EVENTS or
in case of SELECT FROM I_S.EVENTS
*/
verbose= (thd->lex->verbose
&& (thd->security_ctx->master_access & PROCESS_ACL));
/* see others' events only if you have PROCESS_ACL !! */
verbose= ((thd->lex->verbose ||
thd->lex->orig_sql_command != SQLCOM_SHOW_EVENTS) &&
(thd->security_ctx->master_access & PROCESS_ACL));
if (verbose && thd->security_ctx->user)
{
@ -4162,12 +4160,13 @@ int fill_schema_events(THD *thd, TABLE_LIST *tables, COND *cond)
}
else
{
event_table->field[EVEX_FIELD_DEFINER]->store(definer, strlen(definer), scs);
event_table->field[Events::FIELD_DEFINER]->
store(definer, strlen(definer), scs);
key_len= event_table->key_info->key_part[0].store_length;
if (thd->lex->select_lex.db)
{
event_table->field[EVEX_FIELD_DB]->
event_table->field[Events::FIELD_DB]->
store(thd->lex->select_lex.db, strlen(thd->lex->select_lex.db), scs);
key_len+= event_table->key_info->key_part[1].store_length;
}