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WL#3337 (Event scheduler new architecture)

Browse source 
event_scheduler_ng.cc/h is no more
This commit is contained in:
andrey@lmy004. 2006-07-12 10:37:30 +02:00
parent 0d517461f0
commit 3f4e1f5c69
10 changed files with 992 additions and 1028 deletions
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1
mysql-test/r/not_embedded_server.result
View file

@ -1,6 +1,5 @@
prepare stmt1 from ' show full processlist ';
execute stmt1;
Id User Host db Command Time State Info
number event_scheduler localhost NULL Connect time Suspended NULL
number root localhost test Query time NULL show full processlist
deallocate prepare stmt1;

4
sql/Makefile.am
View file

@ -67,7 +67,7 @@ noinst_HEADERS = item.h item_func.h item_sum.h item_cmpfunc.h \
sql_array.h sql_cursor.h events.h \
sql_plugin.h authors.h sql_partition.h event_data_objects.h \
event_queue.h event_db_repository.h \
partition_info.h partition_element.h event_scheduler_ng.h \
partition_info.h partition_element.h event_scheduler.h \
contributors.h
mysqld_SOURCES = sql_lex.cc sql_handler.cc sql_partition.cc \
item.cc item_sum.cc item_buff.cc item_func.cc \
@ -105,7 +105,7 @@ mysqld_SOURCES = sql_lex.cc sql_handler.cc sql_partition.cc \
tztime.cc my_time.c my_user.c my_decimal.cc\
sp_head.cc sp_pcontext.cc sp_rcontext.cc sp.cc \
sp_cache.cc parse_file.cc sql_trigger.cc event_scheduler.cc\
event_scheduler_ng.cc events.cc event_data_objects.cc \
events.cc event_data_objects.cc \
event_queue.cc event_db_repository.cc \
sql_plugin.cc sql_binlog.cc \
sql_builtin.cc sql_tablespace.cc partition_info.cc

4
sql/event_queue.cc
View file

@ -18,7 +18,7 @@
#include "event_queue.h"
#include "event_data_objects.h"
#include "event_db_repository.h"
#include "event_scheduler_ng.h"
#include "event_scheduler.h"
#define EVENT_QUEUE_INITIAL_SIZE 30
@ -123,7 +123,7 @@ Event_queue::deinit_mutexes()
*/
bool
Event_queue::init_queue(Event_db_repository *db_repo, Event_scheduler_ng *sched)
Event_queue::init_queue(Event_db_repository *db_repo, Event_scheduler *sched)
{
int i= 0;
bool ret= FALSE;

6
sql/event_queue.h
View file

@ -22,7 +22,7 @@ class Event_job_data;
class Event_queue_element;
class THD;
class Event_scheduler_ng;
class Event_scheduler;
class Event_queue
{
@ -36,7 +36,7 @@ public:
deinit_mutexes();
bool
init_queue(Event_db_repository *db_repo, Event_scheduler_ng *sched);
init_queue(Event_db_repository *db_repo, Event_scheduler *sched);
void
deinit_queue();
@ -109,7 +109,7 @@ protected:
void
dbug_dump_queue(time_t now);
Event_scheduler_ng *scheduler;
Event_scheduler *scheduler;
/* The sorted queue with the Event_job_data objects */
QUEUE queue;

865
sql/event_scheduler.cc
View file

@ -14,3 +14,868 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include "mysql_priv.h"
#include "events.h"
#include "event_data_objects.h"
#include "event_scheduler.h"
#include "event_queue.h"
#ifdef __GNUC__
#if __GNUC__ >= 2
#define SCHED_FUNC __FUNCTION__
#endif
#else
#define SCHED_FUNC "<unknown>"
#endif
#define LOCK_SCHEDULER_DATA() lock_data(SCHED_FUNC, __LINE__)
#define UNLOCK_SCHEDULER_DATA() unlock_data(SCHED_FUNC, __LINE__)
#define COND_STATE_WAIT(timer) cond_wait(timer, SCHED_FUNC, __LINE__)
extern pthread_attr_t connection_attrib;
struct scheduler_param
{
THD *thd;
Event_scheduler *scheduler;
};
struct scheduler_param scheduler_param_value;
static
LEX_STRING scheduler_states_names[] =
{
{ C_STRING_WITH_LEN("INITIALIZED")},
{ C_STRING_WITH_LEN("RUNNING")},
{ C_STRING_WITH_LEN("STOPPING")}
};
/*
Prints the stack of infos, warnings, errors from thd to
the console so it can be fetched by the logs-into-tables and
checked later.
SYNOPSIS
evex_print_warnings
thd Thread used during the execution of the event
et The event itself
*/
static void
evex_print_warnings(THD *thd, Event_job_data *et)
{
MYSQL_ERROR *err;
DBUG_ENTER("evex_print_warnings");
if (!thd->warn_list.elements)
DBUG_VOID_RETURN;
char msg_buf[10 * STRING_BUFFER_USUAL_SIZE];
char prefix_buf[5 * STRING_BUFFER_USUAL_SIZE];
String prefix(prefix_buf, sizeof(prefix_buf), system_charset_info);
prefix.length(0);
prefix.append("SCHEDULER: [");
append_identifier(thd, &prefix, et->definer.str, et->definer.length);
prefix.append("][", 2);
append_identifier(thd,&prefix, et->dbname.str, et->dbname.length);
prefix.append('.');
append_identifier(thd,&prefix, et->name.str, et->name.length);
prefix.append("] ", 2);
List_iterator_fast<MYSQL_ERROR> it(thd->warn_list);
while ((err= it++))
{
String err_msg(msg_buf, sizeof(msg_buf), system_charset_info);
/* set it to 0 or we start adding at the end. That's the trick ;) */
err_msg.length(0);
err_msg.append(prefix);
err_msg.append(err->msg, strlen(err->msg), system_charset_info);
err_msg.append("]");
DBUG_ASSERT(err->level < 3);
(sql_print_message_handlers[err->level])("%*s", err_msg.length(),
err_msg.c_ptr());
}
DBUG_VOID_RETURN;
}
/*
Inits an scheduler thread handler, both the main and a worker
SYNOPSIS
init_event_thread()
thd - the THD of the thread. Has to be allocated by the caller.
NOTES
1. The host of the thead is my_localhost
2. thd->net is initted with NULL - no communication.
RETURN VALUE
0 OK
-1 Error
*/
static int
init_scheduler_thread(THD* thd)
{
DBUG_ENTER("init_event_thread");
thd->client_capabilities= 0;
thd->security_ctx->master_access= 0;
thd->security_ctx->db_access= 0;
thd->security_ctx->host_or_ip= (char*)my_localhost;
thd->security_ctx->set_user((char*)"event_scheduler");
my_net_init(&thd->net, NULL);
thd->net.read_timeout= slave_net_timeout;
thd->slave_thread= 0;
thd->options|= OPTION_AUTO_IS_NULL;
thd->client_capabilities|= CLIENT_MULTI_RESULTS;
pthread_mutex_lock(&LOCK_thread_count);
thd->thread_id= thread_id++;
threads.append(thd);
thread_count++;
thread_running++;
pthread_mutex_unlock(&LOCK_thread_count);
/*
Guarantees that we will see the thread in SHOW PROCESSLIST though its
vio is NULL.
*/
thd->proc_info= "Initialized";
thd->version= refresh_version;
thd->set_time();
DBUG_RETURN(0);
}
/*
Cleans up the THD and the threaded environment of the thread.
SYNOPSIS
deinit_event_thread()
thd Thread
*/
static void
deinit_event_thread(THD *thd)
{
thd->proc_info= "Clearing";
DBUG_ASSERT(thd->net.buff != 0);
net_end(&thd->net);
DBUG_PRINT("exit", ("Scheduler thread finishing"));
pthread_mutex_lock(&LOCK_thread_count);
thread_count--;
thread_running--;
delete thd;
pthread_mutex_unlock(&LOCK_thread_count);
my_thread_end();
}
/*
Function that executes the scheduler,
SYNOPSIS
event_scheduler_thread()
arg Pointer to `struct scheduler_param`
RETURN VALUE
0 OK
*/
pthread_handler_t
event_scheduler_thread(void *arg)
{
/* needs to be first for thread_stack */
THD *thd= (THD *)(*(struct scheduler_param *) arg).thd;
thd->thread_stack= (char *)&thd; // remember where our stack is
DBUG_ENTER("event_scheduler_thread");
my_thread_init();
pthread_detach_this_thread();
thd->real_id=pthread_self();
if (init_thr_lock() || thd->store_globals())
{
thd->cleanup();
goto end;
}
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
sigset_t set;
VOID(sigemptyset(&set)); // Get mask in use
VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif
((struct scheduler_param *) arg)->scheduler->run(thd);
end:
deinit_event_thread(thd);
DBUG_RETURN(0); // Against gcc warnings
}
/*
Function that executes an event in a child thread. Setups the
environment for the event execution and cleans after that.
SYNOPSIS
event_worker_thread()
arg The Event_job_data object to be processed
RETURN VALUE
0 OK
*/
pthread_handler_t
event_worker_thread(void *arg)
{
/* needs to be first for thread_stack */
THD *thd;
Event_job_data *event= (Event_job_data *)arg;
int ret;
thd= event->thd;
thd->thread_stack= (char *) &thd;
my_thread_init();
pthread_detach_this_thread();
thd->real_id=pthread_self();
if (init_thr_lock() || thd->store_globals())
{
thd->cleanup();
goto end;
}
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
sigset_t set;
VOID(sigemptyset(&set)); // Get mask in use
VOID(pthread_sigmask(SIG_UNBLOCK, &set, &thd->block_signals));
#endif
thd->init_for_queries();
DBUG_ENTER("event_worker_thread");
DBUG_PRINT("info", ("Baikonur, time is %d, BURAN reporting and operational."
"THD=0x%lx", time(NULL), thd));
sql_print_information("SCHEDULER: [%s.%s of %s] executing in thread %lu",
event->dbname.str, event->name.str,
event->definer.str, thd->thread_id);
thd->enable_slow_log= TRUE;
ret= event->execute(thd);
evex_print_warnings(thd, event);
sql_print_information("SCHEDULER: [%s.%s of %s] executed "
" in thread thread %lu. RetCode=%d",
event->dbname.str, event->name.str,
event->definer.str, thd->thread_id, ret);
if (ret == EVEX_COMPILE_ERROR)
sql_print_information("SCHEDULER: COMPILE ERROR for event %s.%s of %s",
event->dbname.str, event->name.str,
event->definer.str);
else if (ret == EVEX_MICROSECOND_UNSUP)
sql_print_information("SCHEDULER: MICROSECOND is not supported");
end:
DBUG_PRINT("info", ("BURAN %s.%s is landing!", event->dbname.str,
event->name.str));
delete event;
deinit_event_thread(thd);
DBUG_RETURN(0); // Against gcc warnings
}
/*
Performs initialization of the scheduler data, outside of the
threading primitives.
SYNOPSIS
Event_scheduler::init_scheduler()
*/
bool
Event_scheduler::init_scheduler(Event_queue *q)
{
LOCK_SCHEDULER_DATA();
thread_id= 0;
state= INITIALIZED;
queue= q;
started_events= 0;
UNLOCK_SCHEDULER_DATA();
return FALSE;
}
void
Event_scheduler::deinit_scheduler() {}
/*
Inits scheduler's threading primitives.
SYNOPSIS
Event_scheduler::init_mutexes()
*/
void
Event_scheduler::init_mutexes()
{
pthread_mutex_init(&LOCK_scheduler_state, MY_MUTEX_INIT_FAST);
pthread_cond_init(&COND_state, NULL);
}
/*
Deinits scheduler's threading primitives.
SYNOPSIS
Event_scheduler::deinit_mutexes()
*/
void
Event_scheduler::deinit_mutexes()
{
pthread_mutex_destroy(&LOCK_scheduler_state);
pthread_cond_destroy(&COND_state);
}
/*
Starts the scheduler (again). Creates a new THD and passes it to
a forked thread. Does not wait for acknowledgement from the new
thread that it has started. Asynchronous starting. Most of the
needed initializations are done in the current thread to minimize
the chance of failure in the spawned thread.
SYNOPSIS
Event_scheduler::start()
RETURN VALUE
FALSE OK
TRUE Error (not reported)
*/
bool
Event_scheduler::start()
{
THD *new_thd= NULL;
bool ret= FALSE;
pthread_t th;
DBUG_ENTER("Event_scheduler::start");
LOCK_SCHEDULER_DATA();
DBUG_PRINT("info", ("state before action %s", scheduler_states_names[state]));
if (state > INITIALIZED)
goto end;
if (!(new_thd= new THD) || init_scheduler_thread(new_thd))
{
sql_print_error("SCHEDULER: Cannot init manager event thread.");
ret= TRUE;
goto end;
}
new_thd->system_thread= SYSTEM_THREAD_EVENT_SCHEDULER;
new_thd->command= COM_DAEMON;
scheduler_param_value.thd= new_thd;
scheduler_param_value.scheduler= this;
DBUG_PRINT("info", ("Forking new thread for scheduduler. THD=0x%lx", new_thd));
if (pthread_create(&th, &connection_attrib, event_scheduler_thread,
(void*)&scheduler_param_value))
{
DBUG_PRINT("error", ("cannot create a new thread"));
state= INITIALIZED;
ret= TRUE;
}
DBUG_PRINT("info", ("Setting state go RUNNING"));
state= RUNNING;
end:
UNLOCK_SCHEDULER_DATA();
if (ret && new_thd)
{
DBUG_PRINT("info", ("There was an error during THD creation. Clean up"));
new_thd->proc_info= "Clearing";
DBUG_ASSERT(new_thd->net.buff != 0);
net_end(&new_thd->net);
pthread_mutex_lock(&LOCK_thread_count);
thread_count--;
thread_running--;
delete new_thd;
pthread_mutex_unlock(&LOCK_thread_count);
}
DBUG_RETURN(ret);
}
/*
Stops the scheduler (again). Waits for acknowledgement from the
scheduler that it has stopped - synchronous stopping.
SYNOPSIS
Event_scheduler::stop()
RETURN VALUE
FALSE OK
TRUE Error (not reported)
*/
bool
Event_scheduler::stop()
{
THD *thd= current_thd;
DBUG_ENTER("Event_scheduler::stop");
DBUG_PRINT("enter", ("thd=0x%lx", current_thd));
LOCK_SCHEDULER_DATA();
DBUG_PRINT("info", ("state before action %s", scheduler_states_names[state]));
if (state != RUNNING)
goto end;
state= STOPPING;
DBUG_PRINT("info", ("Manager thread has id %d", thread_id));
sql_print_information("SCHEDULER: Killing manager thread %lu", thread_id);
pthread_cond_signal(&COND_state);
/* Guarantee we don't catch spurious signals */
sql_print_information("SCHEDULER: Waiting the manager thread to reply");
do {
DBUG_PRINT("info", ("Waiting for COND_started_or_stopped from the manager "
"thread. Current value of state is %s . "
"workers count=%d", scheduler_states_names[state].str,
workers_count()));
/* thd could be 0x0, when shutting down */
COND_STATE_WAIT(NULL);
} while (state == STOPPING);
DBUG_PRINT("info", ("Manager thread has cleaned up. Set state to INIT"));
thread_id= 0;
end:
UNLOCK_SCHEDULER_DATA();
DBUG_RETURN(FALSE);
}
/*
The main loop of the scheduler.
SYNOPSIS
Event_scheduler::run()
thd Thread
RETURN VALUE
FALSE OK
TRUE Error (Serious error)
*/
bool
Event_scheduler::run(THD *thd)
{
int res;
struct timespec abstime;
Event_job_data *job_data;
DBUG_ENTER("Event_scheduler::run");
LOCK_SCHEDULER_DATA();
thread_id= thd->thread_id;
sql_print_information("SCHEDULER: Manager thread started with id %lu",
thread_id);
/*
Recalculate the values in the queue because there could have been stops
in executions of the scheduler and some times could have passed by.
*/
queue->recalculate_activation_times(thd);
while (state == RUNNING)
{
thd->end_time();
/* Gets a minimized version */
if (queue->get_top_for_execution_if_time(thd, thd->query_start(),
&job_data, &abstime))
{
sql_print_information("SCHEDULER: Serious error during getting next"
" event to execute. Stopping.");
break;
}
DBUG_PRINT("info", ("get_top returned job_data=0x%lx now=%d "
"abs_time.tv_sec=%d",
job_data, thd->query_start(), abstime.tv_sec));
if (!job_data && !abstime.tv_sec)
{
DBUG_PRINT("info", ("The queue is empty. Going to sleep"));
thd->enter_cond(&COND_state, &LOCK_scheduler_state,
"Waiting on empty queue");
COND_STATE_WAIT(NULL);
thd->exit_cond("");
DBUG_PRINT("info", ("Woke up. Got COND_state"));
LOCK_SCHEDULER_DATA();
}
else if (abstime.tv_sec)
{
DBUG_PRINT("info", ("Have to sleep some time %u till",
abstime.tv_sec - thd->query_start(), abstime.tv_sec));
thd->enter_cond(&COND_state, &LOCK_scheduler_state,
"Waiting for next activation");
COND_STATE_WAIT(&abstime);
/*
If we get signal we should recalculate the whether it's the right time
because there could be :
1. Spurious wake-up
2. The top of the queue was changed (new one becase of create/update)
*/
/* This will do implicit UNLOCK_SCHEDULER_DATA() */
thd->exit_cond("");
DBUG_PRINT("info", ("Woke up. Got COND_stat or time for execution."));
LOCK_SCHEDULER_DATA();
}
else
{
UNLOCK_SCHEDULER_DATA();
res= execute_top(thd, job_data);
LOCK_SCHEDULER_DATA();
if (res)
break;
++started_events;
}
DBUG_PRINT("info", ("state=%s", scheduler_states_names[state].str));
}
DBUG_PRINT("info", ("Signalling back to the stopper COND_state"));
pthread_cond_signal(&COND_state);
error:
state= INITIALIZED;
UNLOCK_SCHEDULER_DATA();
sql_print_information("SCHEDULER: Stopped");
DBUG_RETURN(res);
}
/*
Creates a new THD instance and then forks a new thread, while passing
the THD pointer and job_data to it.
SYNOPSIS
Event_scheduler::execute_top()
RETURN VALUE
FALSE OK
TRUE Error (Serious error)
*/
bool
Event_scheduler::execute_top(THD *thd, Event_job_data *job_data)
{
THD *new_thd;
pthread_t th;
int res= 0;
DBUG_ENTER("Event_scheduler::execute_top");
if (!(new_thd= new THD) || init_scheduler_thread(new_thd))
goto error;
new_thd->system_thread= SYSTEM_THREAD_EVENT_WORKER;
job_data->thd= new_thd;
DBUG_PRINT("info", ("BURAN %s@%s ready for start t-3..2..1..0..ignition",
job_data->dbname.str, job_data->name.str));
/* Major failure */
if ((res= pthread_create(&th, &connection_attrib, event_worker_thread,
job_data)))
goto error;
DBUG_PRINT("info", ("Launch succeeded. BURAN is in THD=0x%lx", new_thd));
DBUG_RETURN(FALSE);
error:
DBUG_PRINT("error", ("Baikonur, we have a problem! res=%d", res));
if (new_thd)
{
new_thd->proc_info= "Clearing";
DBUG_ASSERT(new_thd->net.buff != 0);
net_end(&new_thd->net);
pthread_mutex_lock(&LOCK_thread_count);
thread_count--;
thread_running--;
delete new_thd;
pthread_mutex_unlock(&LOCK_thread_count);
}
delete job_data;
DBUG_RETURN(TRUE);
}
/*
Returns the current state of the scheduler
SYNOPSIS
Event_scheduler::get_state()
RETURN VALUE
The state of the scheduler (INITIALIZED | RUNNING | STOPPING)
*/
enum Event_scheduler::enum_state
Event_scheduler::get_state()
{
enum Event_scheduler::enum_state ret;
LOCK_SCHEDULER_DATA();
ret= state;
UNLOCK_SCHEDULER_DATA();
return ret;
}
/*
Returns the number of living event worker threads.
SYNOPSIS
Event_scheduler::workers_count()
*/
uint
Event_scheduler::workers_count()
{
THD *tmp;
uint count= 0;
DBUG_ENTER("Event_scheduler::workers_count");
pthread_mutex_lock(&LOCK_thread_count); // For unlink from list
I_List_iterator<THD> it(threads);
while ((tmp=it++))
{
if (tmp->command == COM_DAEMON)
continue;
if (tmp->system_thread == SYSTEM_THREAD_EVENT_WORKER)
++count;
}
pthread_mutex_unlock(&LOCK_thread_count);
DBUG_PRINT("exit", ("%d", count));
DBUG_RETURN(count);
}
/*
Signals the main scheduler thread that the queue has changed
its state.
SYNOPSIS
Event_scheduler::queue_changed()
*/
void
Event_scheduler::queue_changed()
{
DBUG_ENTER("Event_scheduler::queue_changed");
DBUG_PRINT("info", ("Sending COND_state. state (read wo lock)=%s ",
scheduler_states_names[state].str));
pthread_cond_signal(&COND_state);
DBUG_VOID_RETURN;
}
/*
Auxiliary function for locking LOCK_scheduler_state. Used
by the LOCK_SCHEDULER_DATA macro.
SYNOPSIS
Event_scheduler::lock_data()
func Which function is requesting mutex lock
line On which line mutex lock is requested
*/
void
Event_scheduler::lock_data(const char *func, uint line)
{
DBUG_ENTER("Event_scheduler::lock_data");
DBUG_PRINT("enter", ("func=%s line=%u", func, line));
pthread_mutex_lock(&LOCK_scheduler_state);
mutex_last_locked_in_func= func;
mutex_last_locked_at_line= line;
mutex_scheduler_data_locked= TRUE;
DBUG_VOID_RETURN;
}
/*
Auxiliary function for unlocking LOCK_scheduler_state. Used
by the UNLOCK_SCHEDULER_DATA macro.
SYNOPSIS
Event_scheduler::unlock_data()
func Which function is requesting mutex unlock
line On which line mutex unlock is requested
*/
void
Event_scheduler::unlock_data(const char *func, uint line)
{
DBUG_ENTER("Event_scheduler::unlock_data");
DBUG_PRINT("enter", ("func=%s line=%u", func, line));
mutex_last_unlocked_at_line= line;
mutex_scheduler_data_locked= FALSE;
mutex_last_unlocked_in_func= func;
pthread_mutex_unlock(&LOCK_scheduler_state);
DBUG_VOID_RETURN;
}
/*
Wrapper for pthread_cond_wait/timedwait
SYNOPSIS
Event_scheduler::cond_wait()
cond Conditional to wait for
mutex Mutex of the conditional
RETURN VALUE
Error code of pthread_cond_wait()
*/
void
Event_scheduler::cond_wait(struct timespec *abstime,
const char *func, uint line)
{
DBUG_ENTER("Event_scheduler::cond_wait");
waiting_on_cond= TRUE;
mutex_last_unlocked_at_line= line;
mutex_scheduler_data_locked= FALSE;
mutex_last_unlocked_in_func= func;
if (abstime)
pthread_cond_timedwait(&COND_state, &LOCK_scheduler_state, abstime);
else
pthread_cond_wait(&COND_state, &LOCK_scheduler_state);
mutex_last_locked_in_func= func;
mutex_last_locked_at_line= line;
mutex_scheduler_data_locked= TRUE;
waiting_on_cond= FALSE;
DBUG_VOID_RETURN;
}
/*
Dumps the internal status of the scheduler
SYNOPSIS
Event_scheduler::dump_internal_status()
thd Thread
RETURN VALUE
FALSE OK
TRUE Error
*/
bool
Event_scheduler::dump_internal_status(THD *thd)
{
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);
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()))
goto end;
/* thread_id */
protocol->prepare_for_resend();
protocol->store(STRING_WITH_LEN("thread_id"), scs);
if (thread_id)
{
int_string.set((longlong) thread_id, scs);
protocol->store(&int_string);
}
else
protocol->store_null();
if ((ret= protocol->write()))
goto end;
/* 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()))
goto end;
/* 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()))
goto end;
/* 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()))
goto end;
/* 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()))
goto end;
/* 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()))
goto end;
/* 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();
end:
#endif
DBUG_RETURN(ret);
}

104
sql/event_scheduler.h
View file

@ -16,4 +16,108 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
class Event_queue;
class Event_job_data;
class Event_scheduler
{
public:
Event_scheduler(){}
~Event_scheduler(){}
enum enum_state
{
INITIALIZED = 0,
RUNNING,
STOPPING
};
/* State changing methods follow */
bool
start();
bool
stop();
/*
Need to be public because has to be called from the function
passed to pthread_create.
*/
bool
run(THD *thd);
bool
init_scheduler(Event_queue *queue);
void
deinit_scheduler();
void
init_mutexes();
void
deinit_mutexes();
/* Information retrieving methods follow */
enum enum_state
get_state();
void
queue_changed();
bool
dump_internal_status(THD *thd);
private:
uint
workers_count();
/* helper functions */
bool
execute_top(THD *thd, Event_job_data *job_data);
/* helper functions for working with mutexes & conditionals */
void
lock_data(const char *func, uint line);
void
unlock_data(const char *func, uint line);
void
cond_wait(struct timespec *abstime, const char *func, uint line);
pthread_mutex_t LOCK_scheduler_state;
/* This is the current status of the life-cycle of the scheduler. */
enum enum_state state;
/*
Holds the thread id of the executor thread or 0 if the scheduler is not
running. It is used by ::shutdown() to know which thread to kill with
kill_one_thread(). The latter wake ups a thread if it is waiting on a
conditional variable and sets thd->killed to non-zero.
*/
ulong thread_id;
pthread_cond_t COND_state;
Event_queue *queue;
uint mutex_last_locked_at_line;
uint mutex_last_unlocked_at_line;
const char* mutex_last_locked_in_func;
const char* mutex_last_unlocked_in_func;
bool mutex_scheduler_data_locked;
bool waiting_on_cond;
ulonglong started_events;
private:
/* Prevent use of these */
Event_scheduler(const Event_scheduler &);
void operator=(Event_scheduler &);
};
#endif /* _EVENT_SCHEDULER_H_ */

881
sql/event_scheduler_ng.cc
View file

@ -1,881 +0,0 @@
/* Copyright (C) 2004-2006 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include "mysql_priv.h"
#include "events.h"
#include "event_data_objects.h"
#include "event_scheduler_ng.h"
#include "event_queue.h"
#ifdef __GNUC__
#if __GNUC__ >= 2
#define SCHED_FUNC __FUNCTION__
#endif
#else
#define SCHED_FUNC "<unknown>"
#endif
#define LOCK_SCHEDULER_DATA() lock_data(SCHED_FUNC, __LINE__)
#define UNLOCK_SCHEDULER_DATA() unlock_data(SCHED_FUNC, __LINE__)
#define COND_STATE_WAIT(timer) cond_wait(timer, SCHED_FUNC, __LINE__)
extern pthread_attr_t connection_attrib;
struct scheduler_param
{
THD *thd;
Event_scheduler_ng *scheduler;
};
struct scheduler_param scheduler_param_value;
static
LEX_STRING scheduler_states_names[] =
{
{ C_STRING_WITH_LEN("INITIALIZED")},
{ C_STRING_WITH_LEN("RUNNING")},
{ C_STRING_WITH_LEN("STOPPING")}
};
/*
Prints the stack of infos, warnings, errors from thd to
the console so it can be fetched by the logs-into-tables and
checked later.
SYNOPSIS
evex_print_warnings
thd Thread used during the execution of the event
et The event itself
*/
static void
evex_print_warnings(THD *thd, Event_job_data *et)
{
MYSQL_ERROR *err;
DBUG_ENTER("evex_print_warnings");
if (!thd->warn_list.elements)
DBUG_VOID_RETURN;
char msg_buf[10 * STRING_BUFFER_USUAL_SIZE];
char prefix_buf[5 * STRING_BUFFER_USUAL_SIZE];
String prefix(prefix_buf, sizeof(prefix_buf), system_charset_info);
prefix.length(0);
prefix.append("SCHEDULER: [");
append_identifier(thd, &prefix, et->definer.str, et->definer.length);
prefix.append("][", 2);
append_identifier(thd,&prefix, et->dbname.str, et->dbname.length);
prefix.append('.');
append_identifier(thd,&prefix, et->name.str, et->name.length);
prefix.append("] ", 2);
List_iterator_fast<MYSQL_ERROR> it(thd->warn_list);
while ((err= it++))
{
String err_msg(msg_buf, sizeof(msg_buf), system_charset_info);
/* set it to 0 or we start adding at the end. That's the trick ;) */
err_msg.length(0);
err_msg.append(prefix);
err_msg.append(err->msg, strlen(err->msg), system_charset_info);
err_msg.append("]");
DBUG_ASSERT(err->level < 3);
(sql_print_message_handlers[err->level])("%*s", err_msg.length(),
err_msg.c_ptr());
}
DBUG_VOID_RETURN;
}
/*
Inits an scheduler thread handler, both the main and a worker
SYNOPSIS
init_event_thread()
thd - the THD of the thread. Has to be allocated by the caller.
NOTES
1. The host of the thead is my_localhost
2. thd->net is initted with NULL - no communication.
RETURN VALUE
0 OK
-1 Error
*/
static int
init_scheduler_thread(THD* thd)
{
DBUG_ENTER("init_event_thread");
thd->client_capabilities= 0;
thd->security_ctx->master_access= 0;
thd->security_ctx->db_access= 0;
thd->security_ctx->host_or_ip= (char*)my_localhost;
thd->security_ctx->set_user((char*)"event_scheduler");
my_net_init(&thd->net, NULL);
thd->net.read_timeout= slave_net_timeout;
thd->slave_thread= 0;
thd->options|= OPTION_AUTO_IS_NULL;
thd->client_capabilities|= CLIENT_MULTI_RESULTS;
pthread_mutex_lock(&LOCK_thread_count);
thd->thread_id= thread_id++;
threads.append(thd);
thread_count++;
thread_running++;
pthread_mutex_unlock(&LOCK_thread_count);
/*
Guarantees that we will see the thread in SHOW PROCESSLIST though its
vio is NULL.
*/
thd->proc_info= "Initialized";
thd->version= refresh_version;
thd->set_time();
DBUG_RETURN(0);
}
/*
Cleans up the THD and the threaded environment of the thread.
SYNOPSIS
deinit_event_thread()
thd Thread
*/
static void
deinit_event_thread(THD *thd)
{
thd->proc_info= "Clearing";
DBUG_ASSERT(thd->net.buff != 0);
net_end(&thd->net);
DBUG_PRINT("exit", ("Scheduler thread finishing"));
pthread_mutex_lock(&LOCK_thread_count);
thread_count--;
thread_running--;
delete thd;
pthread_mutex_unlock(&LOCK_thread_count);
my_thread_end();
}
/*
Function that executes the scheduler,
SYNOPSIS
event_scheduler_ng_thread()
arg Pointer to `struct scheduler_param`
RETURN VALUE
0 OK
*/
pthread_handler_t
event_scheduler_ng_thread(void *arg)
{
/* needs to be first for thread_stack */
THD *thd= (THD *)(*(struct scheduler_param *) arg).thd;
thd->thread_stack= (char *)&thd; // remember where our stack is
DBUG_ENTER("event_scheduler_ng_thread");
my_thread_init();
pthread_detach_this_thread();
thd->real_id=pthread_self();
if (init_thr_lock() || thd->store_globals())
{
thd->cleanup();
goto end;
}
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
sigset_t set;
VOID(sigemptyset(&set)); // Get mask in use
VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif
((struct scheduler_param *) arg)->scheduler->run(thd);
end:
deinit_event_thread(thd);
DBUG_RETURN(0); // Against gcc warnings
}
/*
Function that executes an event in a child thread. Setups the
environment for the event execution and cleans after that.
SYNOPSIS
event_worker_ng_thread()
arg The Event_job_data object to be processed
RETURN VALUE
0 OK
*/
pthread_handler_t
event_worker_ng_thread(void *arg)
{
/* needs to be first for thread_stack */
THD *thd;
Event_job_data *event= (Event_job_data *)arg;
int ret;
thd= event->thd;
thd->thread_stack= (char *) &thd;
my_thread_init();
pthread_detach_this_thread();
thd->real_id=pthread_self();
if (init_thr_lock() || thd->store_globals())
{
thd->cleanup();
goto end;
}
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
sigset_t set;
VOID(sigemptyset(&set)); // Get mask in use
VOID(pthread_sigmask(SIG_UNBLOCK, &set, &thd->block_signals));
#endif
thd->init_for_queries();
DBUG_ENTER("event_worker_ng_thread");
DBUG_PRINT("info", ("Baikonur, time is %d, BURAN reporting and operational."
"THD=0x%lx", time(NULL), thd));
sql_print_information("SCHEDULER: [%s.%s of %s] executing in thread %lu",
event->dbname.str, event->name.str,
event->definer.str, thd->thread_id);
thd->enable_slow_log= TRUE;
ret= event->execute(thd);
evex_print_warnings(thd, event);
sql_print_information("SCHEDULER: [%s.%s of %s] executed "
" in thread thread %lu. RetCode=%d",
event->dbname.str, event->name.str,
event->definer.str, thd->thread_id, ret);
if (ret == EVEX_COMPILE_ERROR)
sql_print_information("SCHEDULER: COMPILE ERROR for event %s.%s of %s",
event->dbname.str, event->name.str,
event->definer.str);
else if (ret == EVEX_MICROSECOND_UNSUP)
sql_print_information("SCHEDULER: MICROSECOND is not supported");
end:
DBUG_PRINT("info", ("BURAN %s.%s is landing!", event->dbname.str,
event->name.str));
delete event;
deinit_event_thread(thd);
DBUG_RETURN(0); // Against gcc warnings
}
/*
Performs initialization of the scheduler data, outside of the
threading primitives.
SYNOPSIS
Event_scheduler_ng::init_scheduler()
*/
bool
Event_scheduler_ng::init_scheduler(Event_queue *q)
{
LOCK_SCHEDULER_DATA();
thread_id= 0;
state= INITIALIZED;
queue= q;
started_events= 0;
UNLOCK_SCHEDULER_DATA();
return FALSE;
}
void
Event_scheduler_ng::deinit_scheduler() {}
/*
Inits scheduler's threading primitives.
SYNOPSIS
Event_scheduler_ng::init_mutexes()
*/
void
Event_scheduler_ng::init_mutexes()
{
pthread_mutex_init(&LOCK_scheduler_state, MY_MUTEX_INIT_FAST);
pthread_cond_init(&COND_state, NULL);
}
/*
Deinits scheduler's threading primitives.
SYNOPSIS
Event_scheduler_ng::deinit_mutexes()
*/
void
Event_scheduler_ng::deinit_mutexes()
{
pthread_mutex_destroy(&LOCK_scheduler_state);
pthread_cond_destroy(&COND_state);
}
/*
Starts the scheduler (again). Creates a new THD and passes it to
a forked thread. Does not wait for acknowledgement from the new
thread that it has started. Asynchronous starting. Most of the
needed initializations are done in the current thread to minimize
the chance of failure in the spawned thread.
SYNOPSIS
Event_scheduler_ng::start()
RETURN VALUE
FALSE OK
TRUE Error (not reported)
*/
bool
Event_scheduler_ng::start()
{
THD *new_thd= NULL;
bool ret= FALSE;
pthread_t th;
DBUG_ENTER("Event_scheduler_ng::start");
LOCK_SCHEDULER_DATA();
DBUG_PRINT("info", ("state before action %s", scheduler_states_names[state]));
if (state > INITIALIZED)
goto end;
if (!(new_thd= new THD) || init_scheduler_thread(new_thd))
{
sql_print_error("SCHEDULER: Cannot init manager event thread.");
ret= TRUE;
goto end;
}
new_thd->system_thread= SYSTEM_THREAD_EVENT_SCHEDULER;
new_thd->command= COM_DAEMON;
scheduler_param_value.thd= new_thd;
scheduler_param_value.scheduler= this;
DBUG_PRINT("info", ("Forking new thread for scheduduler. THD=0x%lx", new_thd));
if (pthread_create(&th, &connection_attrib, event_scheduler_ng_thread,
(void*)&scheduler_param_value))
{
DBUG_PRINT("error", ("cannot create a new thread"));
state= INITIALIZED;
ret= TRUE;
}
DBUG_PRINT("info", ("Setting state go RUNNING"));
state= RUNNING;
end:
UNLOCK_SCHEDULER_DATA();
if (ret && new_thd)
{
DBUG_PRINT("info", ("There was an error during THD creation. Clean up"));
new_thd->proc_info= "Clearing";
DBUG_ASSERT(new_thd->net.buff != 0);
net_end(&new_thd->net);
pthread_mutex_lock(&LOCK_thread_count);
thread_count--;
thread_running--;
delete new_thd;
pthread_mutex_unlock(&LOCK_thread_count);
}
DBUG_RETURN(ret);
}
/*
Stops the scheduler (again). Waits for acknowledgement from the
scheduler that it has stopped - synchronous stopping.
SYNOPSIS
Event_scheduler_ng::stop()
RETURN VALUE
FALSE OK
TRUE Error (not reported)
*/
bool
Event_scheduler_ng::stop()
{
THD *thd= current_thd;
DBUG_ENTER("Event_scheduler_ng::stop");
DBUG_PRINT("enter", ("thd=0x%lx", current_thd));
LOCK_SCHEDULER_DATA();
DBUG_PRINT("info", ("state before action %s", scheduler_states_names[state]));
if (state != RUNNING)
goto end;
state= STOPPING;
DBUG_PRINT("info", ("Manager thread has id %d", thread_id));
sql_print_information("SCHEDULER: Killing manager thread %lu", thread_id);
pthread_cond_signal(&COND_state);
/* Guarantee we don't catch spurious signals */
sql_print_information("SCHEDULER: Waiting the manager thread to reply");
do {
DBUG_PRINT("info", ("Waiting for COND_started_or_stopped from the manager "
"thread. Current value of state is %s . "
"workers count=%d", scheduler_states_names[state].str,
workers_count()));
/* thd could be 0x0, when shutting down */
COND_STATE_WAIT(NULL);
} while (state == STOPPING);
DBUG_PRINT("info", ("Manager thread has cleaned up. Set state to INIT"));
thread_id= 0;
end:
UNLOCK_SCHEDULER_DATA();
DBUG_RETURN(FALSE);
}
/*
The main loop of the scheduler.
SYNOPSIS
Event_scheduler_ng::run()
thd Thread
RETURN VALUE
FALSE OK
TRUE Error (Serious error)
*/
bool
Event_scheduler_ng::run(THD *thd)
{
int res;
struct timespec abstime;
Event_job_data *job_data;
DBUG_ENTER("Event_scheduler_ng::run");
LOCK_SCHEDULER_DATA();
thread_id= thd->thread_id;
sql_print_information("SCHEDULER: Manager thread started with id %lu",
thread_id);
/*
Recalculate the values in the queue because there could have been stops
in executions of the scheduler and some times could have passed by.
*/
queue->recalculate_activation_times(thd);
while (state == RUNNING)
{
thd->end_time();
/* Gets a minimized version */
if (queue->get_top_for_execution_if_time(thd, thd->query_start(),
&job_data, &abstime))
{
sql_print_information("SCHEDULER: Serious error during getting next"
" event to execute. Stopping.");
break;
}
DBUG_PRINT("info", ("get_top returned job_data=0x%lx now=%d "
"abs_time.tv_sec=%d",
job_data, thd->query_start(), abstime.tv_sec));
if (!job_data && !abstime.tv_sec)
{
DBUG_PRINT("info", ("The queue is empty. Going to sleep"));
thd->enter_cond(&COND_state, &LOCK_scheduler_state,
"Waiting on empty queue");
COND_STATE_WAIT(NULL);
thd->exit_cond("");
DBUG_PRINT("info", ("Woke up. Got COND_state"));
LOCK_SCHEDULER_DATA();
}
else if (abstime.tv_sec)
{
DBUG_PRINT("info", ("Have to sleep some time %u till",
abstime.tv_sec - thd->query_start(), abstime.tv_sec));
thd->enter_cond(&COND_state, &LOCK_scheduler_state,
"Waiting for next activation");
COND_STATE_WAIT(&abstime);
/*
If we get signal we should recalculate the whether it's the right time
because there could be :
1. Spurious wake-up
2. The top of the queue was changed (new one becase of create/update)
*/
/* This will do implicit UNLOCK_SCHEDULER_DATA() */
thd->exit_cond("");
DBUG_PRINT("info", ("Woke up. Got COND_stat or time for execution."));
LOCK_SCHEDULER_DATA();
}
else
{
UNLOCK_SCHEDULER_DATA();
res= execute_top(thd, job_data);
LOCK_SCHEDULER_DATA();
if (res)
break;
++started_events;
}
DBUG_PRINT("info", ("state=%s", scheduler_states_names[state].str));
}
DBUG_PRINT("info", ("Signalling back to the stopper COND_state"));
pthread_cond_signal(&COND_state);
error:
state= INITIALIZED;
UNLOCK_SCHEDULER_DATA();
sql_print_information("SCHEDULER: Stopped");
DBUG_RETURN(res);
}
/*
Creates a new THD instance and then forks a new thread, while passing
the THD pointer and job_data to it.
SYNOPSIS
Event_scheduler_ng::execute_top()
RETURN VALUE
FALSE OK
TRUE Error (Serious error)
*/
bool
Event_scheduler_ng::execute_top(THD *thd, Event_job_data *job_data)
{
THD *new_thd;
pthread_t th;
int res= 0;
DBUG_ENTER("Event_scheduler_ng::execute_top");
if (!(new_thd= new THD) || init_scheduler_thread(new_thd))
goto error;
new_thd->system_thread= SYSTEM_THREAD_EVENT_WORKER;
job_data->thd= new_thd;
DBUG_PRINT("info", ("BURAN %s@%s ready for start t-3..2..1..0..ignition",
job_data->dbname.str, job_data->name.str));
/* Major failure */
if ((res= pthread_create(&th, &connection_attrib, event_worker_ng_thread,
job_data)))
goto error;
DBUG_PRINT("info", ("Launch succeeded. BURAN is in THD=0x%lx", new_thd));
DBUG_RETURN(FALSE);
error:
DBUG_PRINT("error", ("Baikonur, we have a problem! res=%d", res));
if (new_thd)
{
new_thd->proc_info= "Clearing";
DBUG_ASSERT(new_thd->net.buff != 0);
net_end(&new_thd->net);
pthread_mutex_lock(&LOCK_thread_count);
thread_count--;
thread_running--;
delete new_thd;
pthread_mutex_unlock(&LOCK_thread_count);
}
delete job_data;
DBUG_RETURN(TRUE);
}
/*
Returns the current state of the scheduler
SYNOPSIS
Event_scheduler_ng::get_state()
RETURN VALUE
The state of the scheduler (INITIALIZED | RUNNING | STOPPING)
*/
enum Event_scheduler_ng::enum_state
Event_scheduler_ng::get_state()
{
enum Event_scheduler_ng::enum_state ret;
LOCK_SCHEDULER_DATA();
ret= state;
UNLOCK_SCHEDULER_DATA();
return ret;
}
/*
Returns the number of living event worker threads.
SYNOPSIS
Event_scheduler_ng::workers_count()
*/
uint
Event_scheduler_ng::workers_count()
{
THD *tmp;
uint count= 0;
DBUG_ENTER("Event_scheduler_ng::workers_count");
pthread_mutex_lock(&LOCK_thread_count); // For unlink from list
I_List_iterator<THD> it(threads);
while ((tmp=it++))
{
if (tmp->command == COM_DAEMON)
continue;
if (tmp->system_thread == SYSTEM_THREAD_EVENT_WORKER)
++count;
}
pthread_mutex_unlock(&LOCK_thread_count);
DBUG_PRINT("exit", ("%d", count));
DBUG_RETURN(count);
}
/*
Signals the main scheduler thread that the queue has changed
its state.
SYNOPSIS
Event_scheduler_ng::queue_changed()
*/
void
Event_scheduler_ng::queue_changed()
{
DBUG_ENTER("Event_scheduler_ng::queue_changed");
DBUG_PRINT("info", ("Sending COND_state. state (read wo lock)=%s ",
scheduler_states_names[state].str));
pthread_cond_signal(&COND_state);
DBUG_VOID_RETURN;
}
/*
Auxiliary function for locking LOCK_scheduler_state. Used
by the LOCK_SCHEDULER_DATA macro.
SYNOPSIS
Event_scheduler_ng::lock_data()
func Which function is requesting mutex lock
line On which line mutex lock is requested
*/
void
Event_scheduler_ng::lock_data(const char *func, uint line)
{
DBUG_ENTER("Event_scheduler_ng::lock_data");
DBUG_PRINT("enter", ("func=%s line=%u", func, line));
pthread_mutex_lock(&LOCK_scheduler_state);
mutex_last_locked_in_func= func;
mutex_last_locked_at_line= line;
mutex_scheduler_data_locked= TRUE;
DBUG_VOID_RETURN;
}
/*
Auxiliary function for unlocking LOCK_scheduler_state. Used
by the UNLOCK_SCHEDULER_DATA macro.
SYNOPSIS
Event_scheduler_ng::unlock_data()
func Which function is requesting mutex unlock
line On which line mutex unlock is requested
*/
void
Event_scheduler_ng::unlock_data(const char *func, uint line)
{
DBUG_ENTER("Event_scheduler_ng::unlock_data");
DBUG_PRINT("enter", ("func=%s line=%u", func, line));
mutex_last_unlocked_at_line= line;
mutex_scheduler_data_locked= FALSE;
mutex_last_unlocked_in_func= func;
pthread_mutex_unlock(&LOCK_scheduler_state);
DBUG_VOID_RETURN;
}
/*
Wrapper for pthread_cond_wait/timedwait
SYNOPSIS
Event_scheduler_ng::cond_wait()
cond Conditional to wait for
mutex Mutex of the conditional
RETURN VALUE
Error code of pthread_cond_wait()
*/
void
Event_scheduler_ng::cond_wait(struct timespec *abstime,
const char *func, uint line)
{
DBUG_ENTER("Event_scheduler_ng::cond_wait");
waiting_on_cond= TRUE;
mutex_last_unlocked_at_line= line;
mutex_scheduler_data_locked= FALSE;
mutex_last_unlocked_in_func= func;
if (abstime)
pthread_cond_timedwait(&COND_state, &LOCK_scheduler_state, abstime);
else
pthread_cond_wait(&COND_state, &LOCK_scheduler_state);
mutex_last_locked_in_func= func;
mutex_last_locked_at_line= line;
mutex_scheduler_data_locked= TRUE;
waiting_on_cond= FALSE;
DBUG_VOID_RETURN;
}
/*
Dumps the internal status of the scheduler
SYNOPSIS
Event_scheduler_ng::dump_internal_status()
thd Thread
RETURN VALUE
FALSE OK
TRUE Error
*/
bool
Event_scheduler_ng::dump_internal_status(THD *thd)
{
int ret= 0;
DBUG_ENTER("Event_scheduler_ng::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);
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()))
goto end;
/* thread_id */
protocol->prepare_for_resend();
protocol->store(STRING_WITH_LEN("thread_id"), scs);
if (thread_id)
{
int_string.set((longlong) thread_id, scs);
protocol->store(&int_string);
}
else
protocol->store_null();
if ((ret= protocol->write()))
goto end;
/* 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()))
goto end;
/* 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()))
goto end;
/* 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()))
goto end;
/* 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()))
goto end;
/* 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()))
goto end;
/* 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();
end:
#endif
DBUG_RETURN(ret);
}

123
sql/event_scheduler_ng.h
View file

@ -1,123 +0,0 @@
#ifndef _EVENT_SCHEDULER_NG_H_
#define _EVENT_SCHEDULER_NG_H_
/* Copyright (C) 2004-2006 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
class Event_queue;
class Event_job_data;
class Event_scheduler_ng
{
public:
Event_scheduler_ng(){}
~Event_scheduler_ng(){}
enum enum_state
{
INITIALIZED = 0,
RUNNING,
STOPPING
};
/* State changing methods follow */
bool
start();
bool
stop();
/*
Need to be public because has to be called from the function
passed to pthread_create.
*/
bool
run(THD *thd);
bool
init_scheduler(Event_queue *queue);
void
deinit_scheduler();
void
init_mutexes();
void
deinit_mutexes();
/* Information retrieving methods follow */
enum enum_state
get_state();
void
queue_changed();
bool
dump_internal_status(THD *thd);
private:
uint
workers_count();
/* helper functions */
bool
execute_top(THD *thd, Event_job_data *job_data);
/* helper functions for working with mutexes & conditionals */
void
lock_data(const char *func, uint line);
void
unlock_data(const char *func, uint line);
void
cond_wait(struct timespec *abstime, const char *func, uint line);
pthread_mutex_t LOCK_scheduler_state;
/* This is the current status of the life-cycle of the scheduler. */
enum enum_state state;
/*
Holds the thread id of the executor thread or 0 if the scheduler is not
running. It is used by ::shutdown() to know which thread to kill with
kill_one_thread(). The latter wake ups a thread if it is waiting on a
conditional variable and sets thd->killed to non-zero.
*/
ulong thread_id;
pthread_cond_t COND_state;
Event_queue *queue;
uint mutex_last_locked_at_line;
uint mutex_last_unlocked_at_line;
const char* mutex_last_locked_in_func;
const char* mutex_last_unlocked_in_func;
bool mutex_scheduler_data_locked;
bool waiting_on_cond;
ulonglong started_events;
private:
/* Prevent use of these */
Event_scheduler_ng(const Event_scheduler_ng &);
void operator=(Event_scheduler_ng &);
};
#endif /* _EVENT_SCHEDULER_NG_H_ */

28
sql/events.cc
View file

@ -19,7 +19,7 @@
#include "event_data_objects.h"
#include "event_db_repository.h"
#include "event_queue.h"
#include "event_scheduler_ng.h"
#include "event_scheduler.h"
#include "sp_head.h"
/*
@ -560,15 +560,15 @@ int
Events::init()
{
DBUG_ENTER("Events::init");
event_queue->init_queue(db_repository, scheduler_ng);
scheduler_ng->init_scheduler(event_queue);
event_queue->init_queue(db_repository, scheduler);
scheduler->init_scheduler(event_queue);
/* it should be an assignment! */
if (opt_event_scheduler)
{
DBUG_ASSERT(opt_event_scheduler == 1 || opt_event_scheduler == 2);
if (opt_event_scheduler == 1)
DBUG_RETURN(scheduler_ng->start());
DBUG_RETURN(scheduler->start());
}
DBUG_RETURN(0);
@ -590,8 +590,8 @@ Events::deinit()
{
DBUG_ENTER("Events::deinit");
scheduler_ng->stop();
scheduler_ng->deinit_scheduler();
scheduler->stop();
scheduler->deinit_scheduler();
event_queue->deinit_queue();
@ -617,8 +617,8 @@ Events::init_mutexes()
event_queue= new Event_queue;
event_queue->init_mutexes();
scheduler_ng= new Event_scheduler_ng();
scheduler_ng->init_mutexes();
scheduler= new Event_scheduler();
scheduler->init_mutexes();
}
@ -633,9 +633,9 @@ void
Events::destroy_mutexes()
{
event_queue->deinit_mutexes();
scheduler_ng->deinit_mutexes();
scheduler->deinit_mutexes();
delete scheduler_ng;
delete scheduler;
delete db_repository;
pthread_mutex_destroy(&LOCK_event_metadata);
@ -670,7 +670,7 @@ Events::dump_internal_status(THD *thd)
Protocol::SEND_EOF))
DBUG_RETURN(TRUE);
if (scheduler_ng->dump_internal_status(thd) ||
if (scheduler->dump_internal_status(thd) ||
event_queue->dump_internal_status(thd))
DBUG_RETURN(TRUE);
@ -694,7 +694,7 @@ bool
Events::start_execution_of_events()
{
DBUG_ENTER("Events::start_execution_of_events");
DBUG_RETURN(scheduler_ng->start());
DBUG_RETURN(scheduler->start());
}
@ -715,7 +715,7 @@ bool
Events::stop_execution_of_events()
{
DBUG_ENTER("Events::stop_execution_of_events");
DBUG_RETURN(scheduler_ng->stop());
DBUG_RETURN(scheduler->stop());
}
@ -734,5 +734,5 @@ bool
Events::is_started()
{
DBUG_ENTER("Events::is_started");
DBUG_RETURN(scheduler_ng->get_state() == Event_scheduler_ng::RUNNING);
DBUG_RETURN(scheduler->get_state() == Event_scheduler::RUNNING);
}

4
sql/events.h
View file

@ -21,7 +21,7 @@ class Event_parse_data;
class Event_db_repository;
class Event_queue;
class Event_queue_element;
class Event_scheduler_ng;
class Event_scheduler;
/* Return codes */
enum enum_events_error_code
@ -117,7 +117,7 @@ private:
static Events singleton;
Event_queue *event_queue;
Event_scheduler_ng *scheduler_ng;
Event_scheduler *scheduler;
Event_db_repository *db_repository;
pthread_mutex_t LOCK_event_metadata;