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WL#3337 (Event scheduler new architecture)

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Cleaned up the code a bit. Fixed few leaks.
This code still does not load events on server startup
from disk. The problem is that there is a need for a THD instance, which
does not exist during server boot. This will be solved soon.
Still Event_timed is used both for the memory queue and for exectution.
This will be changed according to WL#3337 probably in the next commit.
This commit is contained in:
andrey@lmy004.
2006-07-05 17:12:50 +02:00
parent 2bdd872e5f
commit 3b840adee7
14 changed files with 242 additions and 2286 deletions
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195
sql/event_data_objects.cc
View File

@ -530,18 +530,14 @@ Event_parse_data::init_ends(THD *thd, Item *new_ends)
Event_timed::Event_timed()
*/
Event_timed::Event_timed():in_spawned_thread(0),locked_by_thread_id(0),
running(0), thread_id(0), status_changed(false),
Event_timed::Event_timed():status_changed(false),
last_executed_changed(false), expression(0),
created(0), modified(0),
on_completion(Event_timed::ON_COMPLETION_DROP),
status(Event_timed::ENABLED), sphead(0),
sql_mode(0), dropped(false),
free_sphead_on_delete(true), flags(0)
sql_mode(0), dropped(false), flags(0)
{
pthread_mutex_init(&this->LOCK_running, MY_MUTEX_INIT_FAST);
pthread_cond_init(&this->COND_finished, NULL);
init();
}
@ -555,46 +551,8 @@ Event_timed::Event_timed():in_spawned_thread(0),locked_by_thread_id(0),
Event_timed::~Event_timed()
{
deinit_mutexes();
free_root(&mem_root, MYF(0));
if (free_sphead_on_delete)
free_sp();
}
/*
Destructor
SYNOPSIS
Event_timed::deinit_mutexes()
*/
void
Event_timed::deinit_mutexes()
{
pthread_mutex_destroy(&this->LOCK_running);
pthread_cond_destroy(&this->COND_finished);
}
/*
Checks whether the event is running
SYNOPSIS
Event_timed::is_running()
*/
bool
Event_timed::is_running()
{
bool ret;
VOID(pthread_mutex_lock(&this->LOCK_running));
ret= running;
VOID(pthread_mutex_unlock(&this->LOCK_running));
return ret;
free_sp();
}
@ -1253,7 +1211,7 @@ Event_timed::update_fields(THD *thd)
Open_tables_state backup;
int ret;
DBUG_ENTER("Event_timed::update_time_fields");
DBUG_ENTER("Event_timed::update_fields");
DBUG_PRINT("enter", ("name: %*s", name.length, name.str));
@ -1382,7 +1340,7 @@ Event_timed::get_create_event(THD *thd, String *buf)
Executes the event (the underlying sp_head object);
SYNOPSIS
evex_fill_row()
Event_timed::execute()
thd THD
mem_root If != NULL use it to compile the event on it
@ -1607,149 +1565,6 @@ done:
}
extern pthread_attr_t connection_attrib;
/*
Checks whether is possible and forks a thread. Passes self as argument.
RETURN VALUE
EVENT_EXEC_STARTED OK
EVENT_EXEC_ALREADY_EXEC Thread not forked, already working
EVENT_EXEC_CANT_FORK Unable to spawn thread (error)
*/
int
Event_timed::spawn_now(void * (*thread_func)(void*), void *arg)
{
THD *thd= current_thd;
int ret= EVENT_EXEC_STARTED;
DBUG_ENTER("Event_timed::spawn_now");
DBUG_PRINT("info", ("[%s.%s]", dbname.str, name.str));
VOID(pthread_mutex_lock(&this->LOCK_running));
DBUG_PRINT("info", ("SCHEDULER: execute_at of %s is %lld", name.str,
TIME_to_ulonglong_datetime(&execute_at)));
mark_last_executed(thd);
if (compute_next_execution_time())
{
sql_print_error("SCHEDULER: Error while computing time of %s.%s . "
"Disabling after execution.", dbname.str, name.str);
status= DISABLED;
}
DBUG_PRINT("evex manager", ("[%10s] next exec at [%llu]", name.str,
TIME_to_ulonglong_datetime(&execute_at)));
/*
1. For one-time event : year is > 0 and expression is 0
2. For recurring, expression is != -=> check execute_at_null in this case
*/
if ((execute_at.year && !expression) || execute_at_null)
{
sql_print_information("SCHEDULER: [%s.%s of %s] no more executions "
"after this one", dbname.str, name.str,
definer.str);
flags |= EVENT_EXEC_NO_MORE | EVENT_FREE_WHEN_FINISHED;
}
update_fields(thd);
if (!in_spawned_thread)
{
pthread_t th;
in_spawned_thread= true;
if (pthread_create(&th, &connection_attrib, thread_func, arg))
{
DBUG_PRINT("info", ("problem while spawning thread"));
ret= EVENT_EXEC_CANT_FORK;
in_spawned_thread= false;
}
}
else
{
DBUG_PRINT("info", ("already in spawned thread. skipping"));
ret= EVENT_EXEC_ALREADY_EXEC;
}
VOID(pthread_mutex_unlock(&this->LOCK_running));
DBUG_RETURN(ret);
}
bool
Event_timed::spawn_thread_finish(THD *thd)
{
bool should_free;
DBUG_ENTER("Event_timed::spawn_thread_finish");
VOID(pthread_mutex_lock(&LOCK_running));
in_spawned_thread= false;
DBUG_PRINT("info", ("Sending COND_finished for thread %d", thread_id));
thread_id= 0;
if (dropped)
drop(thd);
pthread_cond_broadcast(&COND_finished);
should_free= flags & EVENT_FREE_WHEN_FINISHED;
VOID(pthread_mutex_unlock(&LOCK_running));
DBUG_RETURN(should_free);
}
/*
Kills a running event
SYNOPSIS
Event_timed::kill_thread()
RETURN VALUE
0 OK
-1 EVEX_CANT_KILL
!0 Error
*/
int
Event_timed::kill_thread(THD *thd)
{
int ret= 0;
DBUG_ENTER("Event_timed::kill_thread");
pthread_mutex_lock(&LOCK_running);
DBUG_PRINT("info", ("thread_id=%lu", thread_id));
if (thread_id == thd->thread_id)
{
/*
We don't kill ourselves in cases like :
alter event e_43 do alter event e_43 do set @a = 4 because
we will never receive COND_finished.
*/
DBUG_PRINT("info", ("It's not safe to kill ourselves in self altering queries"));
ret= EVEX_CANT_KILL;
}
else if (thread_id && !(ret= kill_one_thread(thd, thread_id, false)))
{
thd->enter_cond(&COND_finished, &LOCK_running, "Waiting for finished");
DBUG_PRINT("info", ("Waiting for COND_finished from thread %d", thread_id));
while (thread_id)
pthread_cond_wait(&COND_finished, &LOCK_running);
DBUG_PRINT("info", ("Got COND_finished"));
/* This will implicitly unlock LOCK_running. Hence we return before that */
thd->exit_cond("");
DBUG_RETURN(0);
}
else if (!thread_id && in_spawned_thread)
{
/*
Because the manager thread waits for the forked thread to update thread_id
this situation is impossible.
*/
DBUG_ASSERT(0);
}
pthread_mutex_unlock(&LOCK_running);
DBUG_PRINT("exit", ("%d", ret));
DBUG_RETURN(ret);
}
/*
Checks whether two events have the same name