/* Copyright (c) 2006, 2024, Oracle and/or its affiliates. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License, version 2.0, as published by the Free Software Foundation. This program is designed to work with certain software (including but not limited to OpenSSL) that is licensed under separate terms, as designated in a particular file or component or in included license documentation. The authors of MySQL hereby grant you an additional permission to link the program and your derivative works with the separately licensed software that they have either included with the program or referenced in the documentation. 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, version 2.0, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include "sql/event_scheduler.h" #include #include #include #include "lex_string.h" #include "my_command.h" #include "my_dbug.h" #include "my_psi_config.h" #include "my_sys.h" #include "my_thread.h" #include "mysql/components/services/bits/psi_statement_bits.h" #include "mysql/components/services/log_builtins.h" #include "mysql/my_loglevel.h" #include "mysql/psi/mysql_cond.h" #include "mysql/psi/mysql_mutex.h" #include "mysql/psi/mysql_statement.h" #include "mysql/psi/mysql_thread.h" #include "mysql/service_mysql_alloc.h" #include "mysql/strings/m_ctype.h" #include "mysql/thread_type.h" #include "mysql_com.h" #include "mysqld_error.h" #include "sql/auth/auth_acls.h" #include "sql/auth/sql_security_ctx.h" #include "sql/current_thd.h" #include "sql/dd/dd_schema.h" // dd::Schema_MDL_locker #include "sql/dd/types/event.h" #include "sql/event_data_objects.h" #include "sql/event_db_repository.h" #include "sql/event_queue.h" #include "sql/events.h" #include "sql/log.h" #include "sql/mdl.h" #include "sql/mysqld.h" // my_localhost replica_net_timeout #include "sql/mysqld_thd_manager.h" // Global_THD_manager #include "sql/protocol_classic.h" #include "sql/psi_memory_key.h" #include "sql/query_options.h" #include "sql/sql_class.h" // THD #include "sql/sql_const.h" #include "sql/sql_error.h" // Sql_condition #include "sql/system_variables.h" #include "sql_string.h" #include "string_with_len.h" #include "thr_mutex.h" /** @addtogroup Event_Scheduler @{ */ #define LOCK_DATA() lock_data(__func__, __LINE__) #define UNLOCK_DATA() unlock_data(__func__, __LINE__) #define COND_STATE_WAIT(mythd, abstime, stage) \ cond_wait(mythd, abstime, stage, __func__, __FILE__, __LINE__) extern my_thread_attr_t connection_attrib; static const LEX_CSTRING scheduler_states_names[] = { {STRING_WITH_LEN("INITIALIZED")}, {STRING_WITH_LEN("RUNNING")}, {STRING_WITH_LEN("STOPPING")}}; struct scheduler_param { THD *thd; Event_scheduler *scheduler; }; /* 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 */ void Event_worker_thread::print_warnings(THD *thd, Event_job_data *et) { const Sql_condition *err; enum loglevel ll; DBUG_TRACE; if (thd->get_stmt_da()->cond_count() == 0) 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("Event Scheduler: ["); prefix.append(et->m_definer.str, et->m_definer.length, system_charset_info); prefix.append("][", 2); prefix.append(et->m_schema_name.str, et->m_schema_name.length, system_charset_info); prefix.append('.'); prefix.append(et->m_event_name.str, et->m_event_name.length, system_charset_info); prefix.append("] ", 2); Diagnostics_area::Sql_condition_iterator it = thd->get_stmt_da()->sql_conditions(); 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->message_text(), err->message_octet_length(), system_charset_info); switch (err->severity()) { case Sql_condition::SL_ERROR: ll = ERROR_LEVEL; break; case Sql_condition::SL_WARNING: ll = WARNING_LEVEL; break; case Sql_condition::SL_NOTE: ll = INFORMATION_LEVEL; break; default: ll = ERROR_LEVEL; assert(false); } LogErr(ll, ER_EVENT_MESSAGE_STACK, static_cast(err_msg.length()), err_msg.c_ptr()); } } /* Performs post initialization of structures in a new thread. SYNOPSIS post_init_event_thread() thd Thread NOTES Before this is called, one should not do any DBUG_XXX() calls. */ bool post_init_event_thread(THD *thd) { if (my_thread_init()) { return true; } thd->store_globals(); Global_THD_manager *thd_manager = Global_THD_manager::get_instance(); thd_manager->add_thd(thd); thd_manager->inc_thread_running(); return false; } /* Cleans up the THD and the threaded environment of the thread. SYNOPSIS deinit_event_thread() thd Thread */ void deinit_event_thread(THD *thd) { Global_THD_manager *thd_manager = Global_THD_manager::get_instance(); thd->set_proc_info("Clearing"); thd->get_protocol_classic()->end_net(); DBUG_PRINT("exit", ("Event thread finishing")); thd->release_resources(); thd_manager->remove_thd(thd); thd_manager->dec_thread_running(); delete thd; } /* Performs pre- mysql_thread_create() initialisation of THD. Do this in the thread that will pass THD to the child thread. In the child thread call post_init_event_thread(). SYNOPSIS pre_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. */ void pre_init_event_thread(THD *thd) { DBUG_TRACE; thd->security_context()->set_master_access(0); thd->security_context()->cache_current_db_access(0); thd->security_context()->set_host_or_ip_ptr(my_localhost, strlen(my_localhost)); thd->get_protocol_classic()->init_net(nullptr); thd->security_context()->set_user_ptr(STRING_WITH_LEN("event_scheduler")); thd->get_protocol_classic()->get_net()->read_timeout = replica_net_timeout; thd->slave_thread = false; thd->variables.option_bits |= OPTION_AUTO_IS_NULL; thd->get_protocol_classic()->set_client_capabilities(CLIENT_MULTI_RESULTS); thd->set_new_thread_id(); /* Guarantees that we will see the thread in SHOW PROCESSLIST though its vio is NULL. */ thd->set_proc_info("Initialized"); thd->set_time(); /* Do not use user-supplied timeout value for system threads. */ thd->variables.lock_wait_timeout = LONG_TIMEOUT; } /* Function that executes the scheduler, SYNOPSIS event_scheduler_thread() arg Pointer to `struct scheduler_param` RETURN VALUE 0 OK */ extern "C" { static void *event_scheduler_thread(void *arg) { /* needs to be first for thread_stack */ THD *thd = ((struct scheduler_param *)arg)->thd; Event_scheduler *scheduler = ((struct scheduler_param *)arg)->scheduler; bool res; thd->thread_stack = (char *)&thd; // remember where our stack is mysql_thread_set_psi_id(thd->thread_id()); #ifdef HAVE_PSI_THREAD_INTERFACE /* Update the thread instrumentation. */ PSI_thread *psi = PSI_THREAD_CALL(get_thread)(); thd_set_psi(thd, psi); PSI_THREAD_CALL(set_thread_account) (thd->security_context()->user().str, thd->security_context()->user().length, thd->security_context()->host_or_ip().str, thd->security_context()->host_or_ip().length); PSI_THREAD_CALL(set_thread_command)(thd->get_command()); PSI_THREAD_CALL(set_thread_start_time)(thd->query_start_in_secs()); #endif /* HAVE_PSI_THREAD_INTERFACE */ res = post_init_event_thread(thd); { DBUG_TRACE; my_claim(arg, true); thd->claim_memory_ownership(true); my_free(arg); if (!res) scheduler->run(thd); else { thd->set_proc_info("Clearing"); thd->get_protocol_classic()->end_net(); delete thd; } } // Against gcc warnings my_thread_end(); return nullptr; } /** 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 */ static void *event_worker_thread(void *arg) { THD *thd; Event_queue_element_for_exec *event = (Event_queue_element_for_exec *)arg; event->claim_memory_ownership(true); thd = event->thd; thd->claim_memory_ownership(true); mysql_thread_set_psi_id(thd->thread_id()); #ifdef HAVE_PSI_THREAD_INTERFACE /* Update the thread instrumentation. */ PSI_thread *psi = PSI_THREAD_CALL(get_thread)(); thd_set_psi(thd, psi); PSI_THREAD_CALL(set_thread_account) (thd->security_context()->user().str, thd->security_context()->user().length, thd->security_context()->host_or_ip().str, thd->security_context()->host_or_ip().length); PSI_THREAD_CALL(set_thread_command)(thd->get_command()); PSI_THREAD_CALL(set_thread_start_time)(thd->query_start_in_secs()); #endif /* HAVE_PSI_THREAD_INTERFACE */ Event_worker_thread worker_thread; worker_thread.run(thd, event); my_thread_end(); return nullptr; // Can't return anything here } } // extern "C" /** Function that executes an event in a child thread. Setups the environment for the event execution and cleans after that. SYNOPSIS Event_worker_thread::run() thd Thread context event The Event_queue_element_for_exec object to be processed */ void Event_worker_thread::run(THD *thd, Event_queue_element_for_exec *event) { /* needs to be first for thread_stack */ char my_stack; Event_job_data job_data; bool res; assert(thd->m_digest == nullptr); thd->thread_stack = &my_stack; // remember where our stack is res = post_init_event_thread(thd); DBUG_TRACE; DBUG_PRINT("info", ("Time is %ld, THD: %p", (long)time(nullptr), thd)); if (res) { delete event; deinit_event_thread(thd); return; } mysql_thread_set_secondary_engine(false); #ifdef HAVE_PSI_STATEMENT_INTERFACE PSI_thread *thread = thd_get_psi(thd); if (thread != nullptr) { PSI_THREAD_CALL(detect_telemetry)(thread); } PSI_statement_locker_state state; assert(thd->m_statement_psi == nullptr); thd->m_statement_psi = MYSQL_START_STATEMENT( &state, event->get_psi_info()->m_key, event->dbname.str, event->dbname.length, thd->charset(), nullptr); /* Events from the scheduler 'spawn' in the server, they have no parent session, hence no query attributes. */ MYSQL_NOTIFY_STATEMENT_QUERY_ATTRIBUTES(thd->m_statement_psi, false); #endif /* We must make sure the schema is released and unlocked in the right order. Fail if we are unable to get a meta data lock on the schema name. Separate scope so that the Schema_MDL_locker dtor is run before thd is deleted. */ { dd::Schema_MDL_locker mdl_handler(thd); if (mdl_handler.ensure_locked(event->dbname.str)) goto end; MDL_key mdl_key; dd::Event::create_mdl_key(event->dbname.str, event->name.str, &mdl_key); MDL_request event_mdl_request; MDL_REQUEST_INIT_BY_KEY(&event_mdl_request, &mdl_key, MDL_SHARED, MDL_EXPLICIT); if (thd->mdl_context.acquire_lock(&event_mdl_request, thd->variables.lock_wait_timeout)) { DBUG_PRINT("error", ("Got error in getting MDL locks")); goto end; } if ((res = Event_db_repository::load_named_event(thd, event->dbname, event->name, &job_data))) { DBUG_PRINT("error", ("Got error from load_named_event")); thd->mdl_context.release_lock(event_mdl_request.ticket); goto end; } thd->mdl_context.release_lock(event_mdl_request.ticket); } // End scope so that schema metadata lock is released. thd->enable_slow_log = true; res = job_data.execute(thd, event->dropped); print_warnings(thd, &job_data); if (res) LogErr(INFORMATION_LEVEL, ER_EVENT_EXECUTION_FAILED, job_data.m_definer.str, job_data.m_schema_name.str, job_data.m_event_name.str); end: #ifdef HAVE_PSI_STATEMENT_INTERFACE MYSQL_END_STATEMENT(thd->m_statement_psi, thd->get_stmt_da()); thd->m_statement_psi = nullptr; #endif #ifdef HAVE_PSI_STATEMENT_INTERFACE thread = thd_get_psi(thd); if (thread != nullptr) { PSI_THREAD_CALL(abort_telemetry)(thread); } #endif assert(thd->m_digest == nullptr); DBUG_PRINT("info", ("Done with Event %s.%s", event->dbname.str, event->name.str)); delete event; deinit_event_thread(thd); } Event_scheduler::Event_scheduler(Event_queue *queue_arg) : state(INITIALIZED), scheduler_thd(nullptr), queue(queue_arg), mutex_last_locked_at_line(0), mutex_last_unlocked_at_line(0), mutex_last_locked_in_func("n/a"), mutex_last_unlocked_in_func("n/a"), mutex_scheduler_data_locked(false), waiting_on_cond(false), started_events(0) { mysql_mutex_init(key_event_scheduler_LOCK_scheduler_state, &LOCK_scheduler_state, MY_MUTEX_INIT_FAST); mysql_cond_init(key_event_scheduler_COND_state, &COND_state); } Event_scheduler::~Event_scheduler() { stop(); /* does nothing if not running */ mysql_mutex_destroy(&LOCK_scheduler_state); mysql_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. @param[out] err_no - errno indicating type of error which caused failure to start scheduler thread. @retval false Success. @retval true Error. */ bool Event_scheduler::start(int *err_no) { THD *new_thd = nullptr; bool ret = false; my_thread_handle th; struct scheduler_param *scheduler_param_value; DBUG_TRACE; LOCK_DATA(); DBUG_PRINT("info", ("state before action %s", scheduler_states_names[state].str)); if (state > INITIALIZED) goto end; DBUG_EXECUTE_IF("event_scheduler_thread_create_failure", { *err_no = 11; Events::opt_event_scheduler = Events::EVENTS_OFF; ret = true; goto end; }); if (!(new_thd = new THD)) { LogErr(ERROR_LEVEL, ER_CANT_INIT_SCHEDULER_THREAD); ret = true; goto end; } pre_init_event_thread(new_thd); new_thd->system_thread = SYSTEM_THREAD_EVENT_SCHEDULER; new_thd->set_command(COM_DAEMON); /* We should run the event scheduler thread under the super-user privileges. In particular, this is needed to be able to lock the mysql.events table for writing when the server is running in the read-only mode. Same goes for transaction access mode. Set it to read-write for this thd. In case the definer has SYSTEM_USER privileges then event scheduler thread can drop the event only if the same privilege is granted to it. Therefore, assign all privileges to this thread. */ new_thd->security_context()->skip_grants(); new_thd->security_context()->set_host_or_ip_ptr(my_localhost, strlen(my_localhost)); new_thd->variables.transaction_read_only = false; new_thd->tx_read_only = false; scheduler_param_value = (struct scheduler_param *)my_malloc( key_memory_Event_scheduler_scheduler_param, sizeof(struct scheduler_param), MYF(0)); scheduler_param_value->thd = new_thd; scheduler_param_value->scheduler = this; scheduler_thd = new_thd; DBUG_PRINT("info", ("Setting state go RUNNING")); state = RUNNING; DBUG_PRINT("info", ("Forking new thread for scheduler. THD: %p", new_thd)); /* Transfer memory ownership to the child scheduler thread. */ my_claim(scheduler_param_value, false); new_thd->claim_memory_ownership(false); if ((*err_no = mysql_thread_create(key_thread_event_scheduler, &th, &connection_attrib, event_scheduler_thread, (void *)scheduler_param_value))) { DBUG_PRINT("error", ("cannot create a new thread")); LogErr(ERROR_LEVEL, ER_CANT_CREATE_SCHEDULER_THREAD, *err_no) .os_errno(*err_no); new_thd->set_proc_info("Clearing"); new_thd->get_protocol_classic()->end_net(); state = INITIALIZED; scheduler_thd = nullptr; delete new_thd; my_free(scheduler_param_value); ret = true; } end: UNLOCK_DATA(); return ret; } /* 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) { bool res = false; DBUG_TRACE; LogErr(INFORMATION_LEVEL, ER_SCHEDULER_STARTED, thd->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 (is_running()) { Event_queue_element_for_exec *event_name = nullptr; /* Gets a minimized version */ if (queue->get_top_for_execution_if_time(thd, &event_name)) { /* Report scheduling errors to the error log. */ if (thd->get_stmt_da()->cond_count() > 0) { Diagnostics_area::Sql_condition_iterator it = thd->get_stmt_da()->sql_conditions(); const Sql_condition *err; while ((err = it++)) { if (err->severity() == Sql_condition::SL_ERROR) { char msg_buf[10 * STRING_BUFFER_USUAL_SIZE]; String err_msg(msg_buf, sizeof(msg_buf), system_charset_info); err_msg.length(0); err_msg.append("Event Scheduler: Unable to schedule event: "); err_msg.append(err->message_text(), err->message_octet_length(), system_charset_info); LogErr(ERROR_LEVEL, ER_EVENT_MESSAGE_STACK, static_cast(err_msg.length()), err_msg.c_ptr()); } } } LogErr(INFORMATION_LEVEL, ER_SCHEDULER_STOPPING_FAILED_TO_GET_EVENT); if (event_name != nullptr) delete event_name; break; } DBUG_PRINT("info", ("get_top_for_execution_if_time returned " "event_name=%p", event_name)); if (event_name) { if ((res = execute_top(event_name))) break; } else { assert(thd->killed); DBUG_PRINT("info", ("job_data is NULL, the thread was killed")); } DBUG_PRINT("info", ("state=%s", scheduler_states_names[state].str)); thd->mem_root->Clear(); } LOCK_DATA(); deinit_event_thread(thd); scheduler_thd = nullptr; state = INITIALIZED; DBUG_PRINT("info", ("Broadcasting COND_state back to the stoppers")); mysql_cond_broadcast(&COND_state); UNLOCK_DATA(); 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(Event_queue_element_for_exec *event_name) { THD *new_thd; my_thread_handle th; int res = 0; DBUG_TRACE; if (!(new_thd = new THD())) goto error; pre_init_event_thread(new_thd); new_thd->system_thread = SYSTEM_THREAD_EVENT_WORKER; event_name->thd = new_thd; DBUG_PRINT("info", ("Event %s@%s ready for start", event_name->dbname.str, event_name->name.str)); /* Transfer memory ownership to the child worker thread. */ event_name->claim_memory_ownership(false); new_thd->claim_memory_ownership(false); /* TODO: should use thread pool here, preferably with an upper limit on number of threads: if too many events are scheduled for the same time, starting all of them at once won't help them run truly in parallel (because of the great amount of synchronization), so we may as well execute them in sequence, keeping concurrency at a reasonable level. */ /* Major failure */ if ((res = mysql_thread_create(key_thread_event_worker, &th, &connection_attrib, event_worker_thread, event_name))) { mysql_mutex_lock(&LOCK_global_system_variables); Events::opt_event_scheduler = Events::EVENTS_OFF; mysql_mutex_unlock(&LOCK_global_system_variables); LogErr(ERROR_LEVEL, ER_SCHEDULER_STOPPING_FAILED_TO_CREATE_WORKER, res); new_thd->set_proc_info("Clearing"); new_thd->get_protocol_classic()->end_net(); goto error; } ++started_events; DBUG_PRINT("info", ("Event is in THD: %p", new_thd)); return false; error: DBUG_PRINT("error", ("Event_scheduler::execute_top() res: %d", res)); if (new_thd) delete new_thd; delete event_name; return true; } /* Checks whether the state of the scheduler is RUNNING SYNOPSIS Event_scheduler::is_running() RETURN VALUE true RUNNING false Not RUNNING */ bool Event_scheduler::is_running() { LOCK_DATA(); const bool ret = (state == RUNNING); UNLOCK_DATA(); return ret; } /** Stops the scheduler (again). Waits for acknowledgement from the scheduler that it has stopped - synchronous stopping. Already running events will not be stopped. If the user needs them stopped manual intervention is needed. SYNOPSIS Event_scheduler::stop() RETURN VALUE false OK true Error (not reported) */ bool Event_scheduler::stop() { THD *thd = current_thd; DBUG_TRACE; DBUG_PRINT("enter", ("thd: %p", thd)); LOCK_DATA(); DBUG_PRINT("info", ("state before action %s", scheduler_states_names[state].str)); if (state != RUNNING) { /* Synchronously wait until the scheduler stops. */ while (state != INITIALIZED) COND_STATE_WAIT(thd, nullptr, &stage_waiting_for_scheduler_to_stop); goto end; } /* Guarantee we don't catch spurious signals */ do { DBUG_PRINT("info", ("Waiting for COND_started_or_stopped from " "the scheduler thread. Current value of state is %s . " "workers count=%d", scheduler_states_names[state].str, workers_count())); /* NOTE: We don't use kill_one_thread() because it can't kill COM_DEAMON threads. In addition, kill_one_thread() requires THD but during shutdown current_thd is NULL. Hence, if kill_one_thread should be used it has to be modified to kill also daemons, by adding a flag, and also we have to create artificial THD here. To save all this work, we just do what kill_one_thread() does to kill a thread. See also sql_repl.cc for similar usage. */ state = STOPPING; DBUG_PRINT("info", ("Scheduler thread has id %u", scheduler_thd->thread_id())); /* Lock from delete */ mysql_mutex_lock(&scheduler_thd->LOCK_thd_data); /* This will wake up the thread if it waits on Queue's conditional */ LogErr(INFORMATION_LEVEL, ER_SCHEDULER_KILLING, scheduler_thd->thread_id()); scheduler_thd->awake(THD::KILL_CONNECTION); mysql_mutex_unlock(&scheduler_thd->LOCK_thd_data); /* thd could be 0x0, when shutting down */ LogErr(INFORMATION_LEVEL, ER_SCHEDULER_WAITING); COND_STATE_WAIT(thd, nullptr, &stage_waiting_for_scheduler_to_stop); } while (state == STOPPING); DBUG_PRINT("info", ("Scheduler thread has cleaned up. Set state to INIT")); LogErr(INFORMATION_LEVEL, ER_SCHEDULER_STOPPED); end: UNLOCK_DATA(); return false; } /** This class implements callback for do_for_all_thd(). It counts the total number of living event worker threads from global thread list. */ class Is_worker : public Do_THD_Impl { public: Is_worker() : m_count(0) {} void operator()(THD *thd) override { if (thd->system_thread == SYSTEM_THREAD_EVENT_WORKER) m_count++; return; } int get_count() { return m_count; } private: int m_count; }; /* Returns the number of living event worker threads. SYNOPSIS Event_scheduler::workers_count() */ int Event_scheduler::workers_count() { int count = 0; Is_worker is_worker; DBUG_TRACE; Global_THD_manager::get_instance()->do_for_all_thd(&is_worker); count = is_worker.get_count(); DBUG_PRINT("exit", ("%d", count)); return count; } /* Auxiliary function for locking LOCK_scheduler_state. Used by the LOCK_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_TRACE; DBUG_PRINT("enter", ("func=%s line=%u", func, line)); mysql_mutex_lock(&LOCK_scheduler_state); mutex_last_locked_in_func = func; mutex_last_locked_at_line = line; mutex_scheduler_data_locked = true; } /* Auxiliary function for unlocking LOCK_scheduler_state. Used by the UNLOCK_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_TRACE; 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; mysql_mutex_unlock(&LOCK_scheduler_state); } /* Wrapper for mysql_cond_wait/timedwait SYNOPSIS Event_scheduler::cond_wait() thd Thread (Could be NULL during shutdown procedure) abstime If not null then call mysql_cond_timedwait() msg Message for thd->proc_info func Which function is requesting cond_wait line On which line cond_wait is requested */ void Event_scheduler::cond_wait(THD *thd, struct timespec *abstime, const PSI_stage_info *stage, const char *src_func, const char *src_file, uint src_line) { DBUG_TRACE; waiting_on_cond = true; mutex_last_unlocked_at_line = src_line; mutex_scheduler_data_locked = false; mutex_last_unlocked_in_func = src_func; if (thd) thd->enter_cond(&COND_state, &LOCK_scheduler_state, stage, nullptr, src_func, src_file, src_line); DBUG_PRINT("info", ("mysql_cond_%swait", abstime ? "timed" : "")); if (!abstime) mysql_cond_wait(&COND_state, &LOCK_scheduler_state); else mysql_cond_timedwait(&COND_state, &LOCK_scheduler_state, abstime); if (thd) { /* Need to unlock before exit_cond, so we need to relock. Not the best thing to do but we need to obey cond_wait() */ UNLOCK_DATA(); thd->exit_cond(nullptr, src_func, src_file, src_line); LOCK_DATA(); } mutex_last_locked_in_func = src_func; mutex_last_locked_at_line = src_line; mutex_scheduler_data_locked = true; waiting_on_cond = false; } /* Dumps the internal status of the scheduler SYNOPSIS Event_scheduler::dump_internal_status() */ void Event_scheduler::dump_internal_status() { DBUG_TRACE; puts(""); puts("Event scheduler status:"); printf("State : %s\n", scheduler_states_names[state].str); printf("Thread id : %u\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 : %d\n", workers_count()); printf("Executed : %lu\n", (ulong)started_events); printf("Data locked: %s\n", mutex_scheduler_data_locked ? "YES" : "NO"); } /** @} (End of group Event_Scheduler) */