/***************************************************************************** Copyright (c) 1995, 2017, Oracle and/or its affiliates. All rights reserved. Copyright (c) 2008, 2009, Google Inc. Copyright (c) 2009, Percona Inc. Copyright (c) 2013, 2023, MariaDB Corporation. Portions of this file contain modifications contributed and copyrighted by Google, Inc. Those modifications are gratefully acknowledged and are described briefly in the InnoDB documentation. The contributions by Google are incorporated with their permission, and subject to the conditions contained in the file COPYING.Google. Portions of this file contain modifications contributed and copyrighted by Percona Inc.. Those modifications are gratefully acknowledged and are described briefly in the InnoDB documentation. The contributions by Percona Inc. are incorporated with their permission, and subject to the conditions contained in the file COPYING.Percona. 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; version 2 of the License. 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA *****************************************************************************/ /**************************************************//** @file include/srv0srv.h The server main program Created 10/10/1995 Heikki Tuuri *******************************************************/ #pragma once #include "log0log.h" #include "que0types.h" #include "trx0types.h" #include "fil0fil.h" #include "ut0counter.h" #include "mysql/psi/mysql_stage.h" #include "mysql/psi/psi.h" #include #include /** Simple non-atomic counter @tparam Type the integer type of the counter */ template struct alignas(CPU_LEVEL1_DCACHE_LINESIZE) simple_counter { /** Increment the counter */ Type inc() { return add(1); } /** Decrement the counter */ Type dec() { return add(Type(~0)); } /** Add to the counter @param i amount to be added @return the value of the counter after adding */ Type add(Type i) { return m_counter += i; } /** @return the value of the counter */ operator Type() const { return m_counter; } private: /** The counter */ Type m_counter; }; /** Global counters used inside InnoDB. */ struct srv_stats_t { typedef ib_counter_t ulint_ctr_n_t; typedef simple_counter lsn_ctr_1_t; typedef simple_counter ulint_ctr_1_t; typedef simple_counter int64_ctr_1_t; /** Count the amount of data written in total (in bytes) */ ulint_ctr_1_t data_written; /** Number of bytes saved by page compression */ ulint_ctr_n_t page_compression_saved; /* Number of pages compressed with page compression */ ulint_ctr_n_t pages_page_compressed; /* Number of TRIM operations induced by page compression */ ulint_ctr_n_t page_compressed_trim_op; /* Number of pages decompressed with page compression */ ulint_ctr_n_t pages_page_decompressed; /* Number of page compression errors */ ulint_ctr_n_t pages_page_compression_error; /* Number of pages encrypted */ ulint_ctr_n_t pages_encrypted; /* Number of pages decrypted */ ulint_ctr_n_t pages_decrypted; /* Number of merge blocks encrypted */ ulint_ctr_n_t n_merge_blocks_encrypted; /* Number of merge blocks decrypted */ ulint_ctr_n_t n_merge_blocks_decrypted; /* Number of row log blocks encrypted */ ulint_ctr_n_t n_rowlog_blocks_encrypted; /* Number of row log blocks decrypted */ ulint_ctr_n_t n_rowlog_blocks_decrypted; /** Number of data read in total (in bytes) */ ulint_ctr_1_t data_read; /** Number of encryption_get_latest_key_version calls */ ulint_ctr_n_t n_key_requests; /** Number of temporary tablespace blocks encrypted */ ulint_ctr_n_t n_temp_blocks_encrypted; /** Number of temporary tablespace blocks decrypted */ ulint_ctr_n_t n_temp_blocks_decrypted; }; extern const char* srv_main_thread_op_info; /** Prefix used by MySQL to indicate pre-5.1 table name encoding */ extern const char srv_mysql50_table_name_prefix[10]; /** The buffer pool dump/load file name */ #define SRV_BUF_DUMP_FILENAME_DEFAULT "ib_buffer_pool" extern char* srv_buf_dump_filename; /** Boolean config knobs that tell InnoDB to dump the buffer pool at shutdown and/or load it during startup. */ extern char srv_buffer_pool_dump_at_shutdown; extern char srv_buffer_pool_load_at_startup; /* Whether to disable file system cache if it is defined */ extern char srv_disable_sort_file_cache; /* If the last data file is auto-extended, we add this many pages to it at a time */ #define SRV_AUTO_EXTEND_INCREMENT (srv_sys_space.get_autoextend_increment()) /** Mutex protecting page_zip_stat_per_index */ extern mysql_mutex_t page_zip_stat_per_index_mutex; /** Mutex for locking srv_monitor_file */ extern mysql_mutex_t srv_monitor_file_mutex; /* Temporary file for innodb monitor output */ extern FILE* srv_monitor_file; /** Mutex for locking srv_misc_tmpfile */ extern mysql_mutex_t srv_misc_tmpfile_mutex; /* Temporary file for miscellanous diagnostic output */ extern FILE* srv_misc_tmpfile; /* Server parameters which are read from the initfile */ extern char* srv_data_home; /** Set if InnoDB must operate in read-only mode. We don't do any recovery and open all tables in RO mode instead of RW mode. We don't sync the max trx id to disk either. */ extern my_bool srv_read_only_mode; /** Set if InnoDB operates in read-only mode or innodb-force-recovery is greater than SRV_FORCE_NO_IBUF_MERGE. */ extern my_bool high_level_read_only; /** store to its own file each table created by an user; data dictionary tables are in the system tablespace 0 */ extern my_bool srv_file_per_table; /** Sort buffer size in index creation */ extern ulong srv_sort_buf_size; /** Maximum modification log file size for online index creation */ extern unsigned long long srv_online_max_size; /* If this flag is TRUE, then we will use the native aio of the OS (provided we compiled Innobase with it in), otherwise we will use simulated aio. Currently we support native aio on windows and linux */ extern my_bool srv_use_native_aio; extern my_bool srv_numa_interleave; /* Use atomic writes i.e disable doublewrite buffer */ extern my_bool srv_use_atomic_writes; /* Compression algorithm*/ extern ulong innodb_compression_algorithm; /** TRUE if the server was successfully started */ extern bool srv_was_started; /** Server undo tablespaces directory, can be absolute path. */ extern char* srv_undo_dir; /** Number of undo tablespaces to use. */ extern uint srv_undo_tablespaces; /** The number of UNDO tablespaces that are active (hosting some rollback segment). It is quite possible that some of the tablespaces doesn't host any of the rollback-segment based on configuration used. */ extern uint32_t srv_undo_tablespaces_active; /** Maximum size of undo tablespace. */ extern unsigned long long srv_max_undo_log_size; extern uint srv_n_fil_crypt_threads; extern uint srv_n_fil_crypt_threads_started; /** Enable or Disable Truncate of UNDO tablespace. */ extern my_bool srv_undo_log_truncate; /** Default size of UNDO tablespace (10MiB for innodb_page_size=16k) */ constexpr uint32_t SRV_UNDO_TABLESPACE_SIZE_IN_PAGES= (10U << 20) / UNIV_PAGE_SIZE_DEF; extern char* srv_log_group_home_dir; /** The InnoDB redo log file size, or 0 when changing the redo log format at startup (while disallowing writes to the redo log). */ extern ulonglong srv_log_file_size; extern ulong srv_flush_log_at_trx_commit; extern uint srv_flush_log_at_timeout; extern my_bool srv_adaptive_flushing; extern my_bool srv_flush_sync; /** Requested size in bytes */ extern ulint srv_buf_pool_size; /** Requested buffer pool chunk size */ extern size_t srv_buf_pool_chunk_unit; /** Scan depth for LRU flush batch i.e.: number of blocks scanned*/ extern ulong srv_LRU_scan_depth; /** Whether or not to flush neighbors of a block */ extern ulong srv_flush_neighbors; /** Previously requested size */ extern ulint srv_buf_pool_old_size; /** Current size as scaling factor for the other components */ extern ulint srv_buf_pool_base_size; /** Current size in bytes */ extern ulint srv_buf_pool_curr_size; /** Dump this % of each buffer pool during BP dump */ extern ulong srv_buf_pool_dump_pct; #ifdef UNIV_DEBUG /** Abort load after this amount of pages */ extern ulong srv_buf_pool_load_pages_abort; #endif /** Lock table size in bytes */ extern ulint srv_lock_table_size; /** the value of innodb_checksum_algorithm */ extern ulong srv_checksum_algorithm; extern my_bool srv_random_read_ahead; extern ulong srv_read_ahead_threshold; extern uint srv_n_read_io_threads; extern uint srv_n_write_io_threads; /* Defragmentation, Origianlly facebook default value is 100, but it's too high */ #define SRV_DEFRAGMENT_FREQUENCY_DEFAULT 40 extern my_bool srv_defragment; extern uint srv_defragment_n_pages; extern uint srv_defragment_stats_accuracy; extern uint srv_defragment_fill_factor_n_recs; extern double srv_defragment_fill_factor; extern uint srv_defragment_frequency; extern ulonglong srv_defragment_interval; extern uint srv_change_buffer_max_size; /* Number of IO operations per second the server can do */ extern ulong srv_io_capacity; /* We use this dummy default value at startup for max_io_capacity. The real value is set based on the value of io_capacity. */ #define SRV_MAX_IO_CAPACITY_DUMMY_DEFAULT (~0UL) #define SRV_MAX_IO_CAPACITY_LIMIT (~0UL) extern ulong srv_max_io_capacity; /* The "innodb_stats_method" setting, decides how InnoDB is going to treat NULL value when collecting statistics. It is not defined as enum type because the configure option takes unsigned integer type. */ extern ulong srv_innodb_stats_method; extern ulint srv_max_n_open_files; extern double srv_max_buf_pool_modified_pct; extern double srv_max_dirty_pages_pct_lwm; extern double srv_adaptive_flushing_lwm; extern ulong srv_flushing_avg_loops; extern ulong srv_force_recovery; /** innodb_fast_shutdown=1 skips purge and change buffer merge. innodb_fast_shutdown=2 effectively crashes the server (no log checkpoint). innodb_fast_shutdown=3 is a clean shutdown that skips the rollback of active transaction (to be done on restart). */ extern uint srv_fast_shutdown; extern ibool srv_innodb_status; extern unsigned long long srv_stats_transient_sample_pages; extern my_bool srv_stats_persistent; extern unsigned long long srv_stats_persistent_sample_pages; extern my_bool srv_stats_auto_recalc; extern my_bool srv_stats_include_delete_marked; extern unsigned long long srv_stats_modified_counter; extern my_bool srv_stats_sample_traditional; extern my_bool srv_use_doublewrite_buf; extern ulong srv_checksum_algorithm; extern my_bool srv_force_primary_key; extern ulong srv_max_purge_lag; extern ulong srv_max_purge_lag_delay; extern my_bool innodb_encrypt_temporary_tables; extern my_bool srv_immediate_scrub_data_uncompressed; /*-------------------------------------------*/ /** Modes of operation */ enum srv_operation_mode { /** Normal mode (MariaDB Server) */ SRV_OPERATION_NORMAL, /** Mariabackup is executing server to export already restored tablespaces */ SRV_OPERATION_EXPORT_RESTORED, /** Mariabackup taking a backup */ SRV_OPERATION_BACKUP, /** Mariabackup restoring a backup for subsequent --copy-back */ SRV_OPERATION_RESTORE, /** Mariabackup restoring the incremental part of a backup */ SRV_OPERATION_RESTORE_DELTA, /** Mariabackup restoring a backup for subsequent --export */ SRV_OPERATION_RESTORE_EXPORT, /** Mariabackup taking a backup and avoid deferring any tablespace */ SRV_OPERATION_BACKUP_NO_DEFER }; /** Current mode of operation */ extern enum srv_operation_mode srv_operation; /** whether this is the server's first start after mariabackup --prepare */ extern bool srv_start_after_restore; extern my_bool srv_print_innodb_monitor; extern my_bool srv_print_innodb_lock_monitor; extern ibool srv_print_verbose_log; extern bool srv_monitor_active; extern ulong srv_n_spin_wait_rounds; extern uint srv_spin_wait_delay; /** Number of initialized rollback segments for persistent undo log */ extern ulong srv_available_undo_logs; /** Iterations of the loop bounded by 'srv_active' label. */ extern ulint srv_main_active_loops; /** Iterations of the loop bounded by the 'srv_idle' label. */ extern ulint srv_main_idle_loops; /** Log writes involving flush. */ extern ulint srv_log_writes_and_flush; #ifdef UNIV_DEBUG extern my_bool innodb_evict_tables_on_commit_debug; extern my_bool srv_purge_view_update_only_debug; /** InnoDB system tablespace to set during recovery */ extern uint srv_sys_space_size_debug; /** whether redo log file has been created at startup */ extern bool srv_log_file_created; #endif /* UNIV_DEBUG */ extern ulint srv_dml_needed_delay; /** innodb_purge_threads; the number of purge tasks to use */ extern uint srv_n_purge_threads; /* the number of pages to purge in one batch */ extern ulong srv_purge_batch_size; /* print all user-level transactions deadlocks to mysqld stderr */ extern my_bool srv_print_all_deadlocks; extern my_bool srv_cmp_per_index_enabled; /** innodb_encrypt_log */ extern my_bool srv_encrypt_log; /* is encryption enabled */ extern ulong srv_encrypt_tables; /** Status variables to be passed to MySQL */ extern struct export_var_t export_vars; /** Global counters */ extern srv_stats_t srv_stats; /** Fatal semaphore wait threshold = maximum number of seconds that semaphore times out in InnoDB */ #define DEFAULT_SRV_FATAL_SEMAPHORE_TIMEOUT 600 extern ulong srv_fatal_semaphore_wait_threshold; /** Buffer pool dump status frequence in percentages */ extern ulong srv_buf_dump_status_frequency; # ifdef UNIV_PFS_THREAD extern mysql_pfs_key_t page_cleaner_thread_key; extern mysql_pfs_key_t trx_rollback_clean_thread_key; extern mysql_pfs_key_t thread_pool_thread_key; /* This macro register the current thread and its key with performance schema */ # define pfs_register_thread(key) \ do { \ struct PSI_thread* psi __attribute__((unused)) \ = PSI_CALL_new_thread(key, NULL, 0); \ PSI_CALL_set_thread_os_id(psi); \ PSI_CALL_set_thread(psi); \ } while (0) /* This macro delist the current thread from performance schema */ # define pfs_delete_thread() \ do { \ PSI_CALL_delete_current_thread(); \ } while (0) # else # define pfs_register_thread(key) # define pfs_delete_thread() # endif /* UNIV_PFS_THREAD */ #ifdef HAVE_PSI_STAGE_INTERFACE /** Performance schema stage event for monitoring ALTER TABLE progress in ha_innobase::commit_inplace_alter_table(). */ extern PSI_stage_info srv_stage_alter_table_end; /** Performance schema stage event for monitoring ALTER TABLE progress row_merge_insert_index_tuples(). */ extern PSI_stage_info srv_stage_alter_table_insert; /** Performance schema stage event for monitoring ALTER TABLE progress row_log_apply(). */ extern PSI_stage_info srv_stage_alter_table_log_index; /** Performance schema stage event for monitoring ALTER TABLE progress row_log_table_apply(). */ extern PSI_stage_info srv_stage_alter_table_log_table; /** Performance schema stage event for monitoring ALTER TABLE progress row_merge_sort(). */ extern PSI_stage_info srv_stage_alter_table_merge_sort; /** Performance schema stage event for monitoring ALTER TABLE progress row_merge_read_clustered_index(). */ extern PSI_stage_info srv_stage_alter_table_read_pk_internal_sort; /** Performance schema stage event for monitoring buffer pool load progress. */ extern PSI_stage_info srv_stage_buffer_pool_load; #endif /* HAVE_PSI_STAGE_INTERFACE */ /** Alternatives for srv_force_recovery. Non-zero values are intended to help the user get a damaged database up so that he can dump intact tables and rows with SELECT INTO OUTFILE. The database must not otherwise be used with these options! A bigger number below means that all precautions of lower numbers are included. */ enum { SRV_FORCE_IGNORE_CORRUPT = 1, /*!< let the server run even if it detects a corrupt page */ SRV_FORCE_NO_BACKGROUND = 2, /*!< prevent the main thread from running: if a crash would occur in purge, this prevents it */ SRV_FORCE_NO_TRX_UNDO = 3, /*!< do not run DML rollback after recovery */ SRV_FORCE_NO_DDL_UNDO = 4, /*!< prevent also DDL rollback */ SRV_FORCE_NO_UNDO_LOG_SCAN = 5, /*!< do not look at undo logs when starting the database: InnoDB will treat even incomplete transactions as committed */ SRV_FORCE_NO_LOG_REDO = 6 /*!< do not do the log roll-forward in connection with recovery */ }; /* Alternatives for srv_innodb_stats_method, which could be changed by setting innodb_stats_method */ enum srv_stats_method_name_enum { SRV_STATS_NULLS_EQUAL, /* All NULL values are treated as equal. This is the default setting for innodb_stats_method */ SRV_STATS_NULLS_UNEQUAL, /* All NULL values are treated as NOT equal. */ SRV_STATS_NULLS_IGNORED /* NULL values are ignored */ }; typedef enum srv_stats_method_name_enum srv_stats_method_name_t; /*********************************************************************//** Boots Innobase server. */ void srv_boot(void); /*==========*/ /*********************************************************************//** Frees the data structures created in srv_init(). */ void srv_free(void); /******************************************************************//** Outputs to a file the output of the InnoDB Monitor. @return FALSE if not all information printed due to failure to obtain necessary mutex */ ibool srv_printf_innodb_monitor( /*======================*/ FILE* file, /*!< in: output stream */ ibool nowait, /*!< in: whether to wait for lock_sys.latch */ ulint* trx_start, /*!< out: file position of the start of the list of active transactions */ ulint* trx_end); /*!< out: file position of the end of the list of active transactions */ /******************************************************************//** Function to pass InnoDB status variables to MySQL */ void srv_export_innodb_status(void); /*==========================*/ /*******************************************************************//** Get current server activity count. @return activity count. */ ulint srv_get_activity_count(void); /*========================*/ /******************************************************************//** Increment the server activity counter. */ void srv_inc_activity_count(void); /*=========================*/ /**********************************************************************//** Enqueues a task to server task queue and releases a worker thread, if there is a suspended one. */ void srv_que_task_enqueue_low( /*=====================*/ que_thr_t* thr); /*!< in: query thread */ #ifdef UNIV_DEBUG /** @return whether purge or master task is active */ bool srv_any_background_activity(); #endif extern "C" { /** Periodic task which prints the info output by various InnoDB monitors.*/ void srv_monitor_task(void*); /** The periodic master task controlling the server. */ void srv_master_callback(void*); /** Complete the shutdown tasks such as background DROP TABLE, and optionally change buffer merge (on innodb_fast_shutdown=0). */ void srv_shutdown(bool ibuf_merge); } /* extern "C" */ #ifdef UNIV_DEBUG /** @return number of tasks in queue */ ulint srv_get_task_queue_length(); #endif /** Shut down the purge threads. */ void srv_purge_shutdown(); /** Init purge tasks*/ void srv_init_purge_tasks(); /** Status variables to be passed to MySQL */ struct export_var_t{ #ifdef BTR_CUR_HASH_ADAPT ulint innodb_ahi_hit; ulint innodb_ahi_miss; #endif /* BTR_CUR_HASH_ADAPT */ char innodb_buffer_pool_dump_status[OS_FILE_MAX_PATH + 128];/*!< Buf pool dump status */ char innodb_buffer_pool_load_status[OS_FILE_MAX_PATH + 128];/*!< Buf pool load status */ char innodb_buffer_pool_resize_status[512];/*!< Buf pool resize status */ my_bool innodb_buffer_pool_load_incomplete;/*!< Buf pool load incomplete */ ulint innodb_buffer_pool_pages_total; /*!< Buffer pool size */ ulint innodb_buffer_pool_bytes_data; /*!< File bytes used */ ulint innodb_buffer_pool_pages_misc; /*!< Miscellanous pages */ #ifdef UNIV_DEBUG ulint innodb_buffer_pool_pages_latched; /*!< Latched pages */ #endif /* UNIV_DEBUG */ /** buf_pool.stat.n_page_gets (a sharded counter) */ ulint innodb_buffer_pool_read_requests; ulint innodb_checkpoint_age; ulint innodb_checkpoint_max_age; ulint innodb_data_pending_reads; /*!< Pending reads */ ulint innodb_data_pending_writes; /*!< Pending writes */ ulint innodb_data_read; /*!< Data bytes read */ ulint innodb_data_writes; /*!< I/O write requests */ ulint innodb_data_written; /*!< Data bytes written */ ulint innodb_data_reads; /*!< I/O read requests */ ulint innodb_dblwr_pages_written; /*!< srv_dblwr_pages_written */ ulint innodb_dblwr_writes; /*!< srv_dblwr_writes */ ulint innodb_deadlocks; ulint innodb_history_list_length; lsn_t innodb_lsn_current; lsn_t innodb_lsn_flushed; lsn_t innodb_lsn_last_checkpoint; trx_id_t innodb_max_trx_id; #ifdef BTR_CUR_HASH_ADAPT ulint innodb_mem_adaptive_hash; #endif ulint innodb_mem_dictionary; /** log_sys.get_lsn() - recv_sys.lsn */ lsn_t innodb_os_log_written; ulint innodb_row_lock_waits; /*!< srv_n_lock_wait_count */ ulint innodb_row_lock_current_waits; /*!< srv_n_lock_wait_current_count */ int64_t innodb_row_lock_time; /*!< srv_n_lock_wait_time / 1000 */ uint64_t innodb_row_lock_time_avg; /*!< srv_n_lock_wait_time / srv_n_lock_wait_count */ uint64_t innodb_row_lock_time_max; /*!< srv_n_lock_max_wait_time */ /** Number of undo tablespace truncation operations */ ulong innodb_undo_truncations; ulint innodb_defragment_compression_failures; /*!< Number of defragment re-compression failures */ ulint innodb_defragment_failures; /*!< Number of defragment failures*/ ulint innodb_defragment_count; /*!< Number of defragment operations*/ /** Number of instant ALTER TABLE operations that affect columns */ ulong innodb_instant_alter_column; ulint innodb_onlineddl_rowlog_rows; /*!< Online alter rows */ ulint innodb_onlineddl_rowlog_pct_used; /*!< Online alter percentage of used row log buffer */ ulint innodb_onlineddl_pct_progress; /*!< Online alter progress */ int64_t innodb_page_compression_saved;/*!< Number of bytes saved by page compression */ int64_t innodb_pages_page_compressed;/*!< Number of pages compressed by page compression */ int64_t innodb_page_compressed_trim_op;/*!< Number of TRIM operations induced by page compression */ int64_t innodb_pages_page_decompressed;/*!< Number of pages decompressed by page compression */ int64_t innodb_pages_page_compression_error;/*!< Number of page compression errors */ int64_t innodb_pages_encrypted; /*!< Number of pages encrypted */ int64_t innodb_pages_decrypted; /*!< Number of pages decrypted */ /*!< Number of merge blocks encrypted */ ib_int64_t innodb_n_merge_blocks_encrypted; /*!< Number of merge blocks decrypted */ ib_int64_t innodb_n_merge_blocks_decrypted; /*!< Number of row log blocks encrypted */ ib_int64_t innodb_n_rowlog_blocks_encrypted; /*!< Number of row log blocks decrypted */ ib_int64_t innodb_n_rowlog_blocks_decrypted; /* Number of temporary tablespace pages encrypted */ ib_int64_t innodb_n_temp_blocks_encrypted; /* Number of temporary tablespace pages decrypted */ ib_int64_t innodb_n_temp_blocks_decrypted; ulint innodb_encryption_rotation_pages_read_from_cache; ulint innodb_encryption_rotation_pages_read_from_disk; ulint innodb_encryption_rotation_pages_modified; ulint innodb_encryption_rotation_pages_flushed; ulint innodb_encryption_rotation_estimated_iops; int64_t innodb_encryption_key_requests; }; extern tpool::thread_pool *srv_thread_pool; extern std::unique_ptr srv_master_timer; extern std::unique_ptr srv_monitor_timer; /** The interval at which srv_monitor_task is invoked, in milliseconds */ constexpr unsigned SRV_MONITOR_INTERVAL= 15000; /* 4 times per minute */ static inline void srv_monitor_timer_schedule_now() { srv_monitor_timer->set_time(0, SRV_MONITOR_INTERVAL); } static inline void srv_start_periodic_timer(std::unique_ptr& t, void (*func)(void*), int period) { t.reset(srv_thread_pool->create_timer(func)); t->set_time(0, period); } void srv_thread_pool_init(); void srv_thread_pool_end();