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aligned.h
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aria_backup.h
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assume_aligned.h
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atomic
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authors.h
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backup.h
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bounded_queue.h
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client_settings.h
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compat56.h
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config.h
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contributors.h
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create_options.h
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create_tmp_table.h
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cset_narrowing.h
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custom_conf.h
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datadict.h
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ddl_log.h
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debug.h
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debug_sync.h
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derived_handler.h
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derror.h
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des_key_file.h
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discover.h
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dur_prop.h
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embedded_priv.h
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event_data_objects.h
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event_db_repository.h
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event_parse_data.h
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event_queue.h
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event_scheduler.h
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events.h
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field.h
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field_comp.h
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filesort.h
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filesort_utils.h
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ft_global.h
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gcalc_slicescan.h
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gcalc_tools.h
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grant.h
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group_by_handler.h
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gstream.h
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ha_handler_stats.h
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ha_partition.h
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ha_sequence.h
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handle_connections_win.h
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handler.h
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hash.h
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hash_filo.h
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heap.h
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hostname.h
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ilist.h
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init.h
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innodb_priv.h
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item.h
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item_cmpfunc.h
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item_create.h
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item_func.h
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item_geofunc.h
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item_jsonfunc.h
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item_row.h
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item_strfunc.h
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item_subselect.h
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item_sum.h
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item_timefunc.h
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item_vers.h
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item_windowfunc.h
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item_xmlfunc.h
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json_table.h
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key.h
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keycaches.h
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lex.h
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lex_string.h
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lex_symbol.h
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lf.h
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lock.h
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log.h
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log_event.h
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log_event_data_type.h
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log_event_old.h
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log_slow.h
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maria.h
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mariadb.h
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mdl.h
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mem_root_array.h
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message.h
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multi_range_read.h
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my_alarm.h
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my_apc.h
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my_atomic.h
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my_atomic_wrapper.h
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my_base.h
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my_bit.h
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my_bitmap.h
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my_check_opt.h
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my_compare.h
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my_counter.h
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my_cpu.h
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my_crypt.h
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my_decimal.h
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my_default.h
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my_handler_errors.h
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my_json_writer.h
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my_libwrap.h
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my_md5.h
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my_minidump.h
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my_nosys.h
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my_rdtsc.h
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my_rnd.h
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my_service_manager.h
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my_stack_alloc.h
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my_stacktrace.h
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my_time.h
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my_tree.h
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my_uctype.h
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my_user.h
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myisam.h
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myisamchk.h
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myisammrg.h
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myisampack.h
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mysqld.h
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mysqld_default_groups.h
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mysqld_suffix.h
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mysys_err.h
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opt_range.h
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opt_subselect.h
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opt_trace.h
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opt_trace_context.h
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parse_file.h
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partition_element.h
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partition_info.h
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password.h
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pfs_file_provider.h
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pfs_idle_provider.h
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pfs_memory_provider.h
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pfs_metadata_provider.h
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pfs_socket_provider.h
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pfs_stage_provider.h
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pfs_statement_provider.h
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pfs_table_provider.h
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pfs_thread_provider.h
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pfs_transaction_provider.h
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privilege.h
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probes_mysql.h
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probes_mysql_dtrace.h
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probes_mysql_nodtrace.h
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procedure.h
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protocol.h
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proxy_protocol.h
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queues.h
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records.h
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repl_failsafe.h
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replication.h
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rijndael.h
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rowid_filter.h
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rpl_constants.h
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rpl_filter.h
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rpl_gtid.h
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rpl_injector.h
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rpl_mi.h
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rpl_parallel.h
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rpl_record.h
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rpl_record_old.h
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rpl_reporting.h
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rpl_rli.h
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rpl_tblmap.h
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rpl_utility.h
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scheduler.h
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scope.h
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select_handler.h
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semisync.h
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semisync_master.h
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semisync_master_ack_receiver.h
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semisync_slave.h
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service_versions.h
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session_tracker.h
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set_var.h
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slave.h
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socketpair.h
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source_revision.h
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sp.h
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sp_cache.h
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sp_head.h
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sp_pcontext.h
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sp_rcontext.h
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span.h
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spatial.h
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sql_acl.h
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sql_admin.h
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sql_alloc.h
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sql_alter.h
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sql_analyse.h
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sql_analyze_stmt.h
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sql_array.h
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sql_audit.h
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sql_base.h
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sql_basic_types.h
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sql_binlog.h
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sql_bitmap.h
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sql_bootstrap.h
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sql_cache.h
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sql_callback.h
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sql_class.h
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sql_cmd.h
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sql_connect.h
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sql_const.h
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sql_crypt.h
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sql_cte.h
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sql_cursor.h
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sql_db.h
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sql_debug.h
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sql_delete.h
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sql_derived.h
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sql_digest.h
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sql_digest_stream.h
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sql_do.h
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sql_error.h
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sql_explain.h
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sql_expression_cache.h
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sql_get_diagnostics.h
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sql_handler.h
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sql_help.h
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sql_hset.h
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sql_i_s.h
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sql_insert.h
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sql_join_cache.h
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sql_lex.h
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sql_lifo_buffer.h
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sql_limit.h
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sql_list.h
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sql_load.h
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sql_locale.h
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sql_manager.h
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sql_mode.h
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sql_parse.h
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sql_partition.h
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sql_partition_admin.h
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sql_plist.h
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sql_plugin.h
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sql_plugin_compat.h
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sql_prepare.h
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sql_priv.h
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sql_profile.h
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sql_reload.h
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sql_rename.h
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sql_repl.h
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sql_schema.h
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sql_select.h
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sql_sequence.h
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sql_servers.h
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sql_show.h
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sql_signal.h
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sql_sort.h
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sql_statistics.h
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sql_string.h
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sql_table.h
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sql_tablespace.h
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sql_test.h
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sql_time.h
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sql_trigger.h
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sql_truncate.h
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sql_tvc.h
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sql_type.h
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sql_type_fixedbin.h
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sql_type_fixedbin_storage.h
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sql_type_geom.h
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sql_type_int.h
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sql_type_json.h
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sql_type_real.h
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sql_type_string.h
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sql_udf.h
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sql_union.h
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sql_update.h
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sql_view.h
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sql_window.h
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ssl_compat.h
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strfunc.h
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structs.h
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sys_vars_shared.h
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t_ctype.h
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table.h
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table_cache.h
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thr_alarm.h
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thr_lock.h
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thr_malloc.h
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thr_timer.h
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thread_cache.h
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threadpool.h
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threadpool_generic.h
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threadpool_winsockets.h
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transaction.h
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tzfile.h
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tztime.h
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uniques.h
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unireg.h
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vers_string.h
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violite.h
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waiting_threads.h
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welcome_copyright_notice.h
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win_tzname_data.h
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winservice.h
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wqueue.h
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wsrep.h
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wsrep_applier.h
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wsrep_binlog.h
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wsrep_client_service.h
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wsrep_client_state.h
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wsrep_condition_variable.h
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wsrep_high_priority_service.h
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wsrep_mutex.h
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wsrep_mysqld.h
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wsrep_mysqld_c.h
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wsrep_on.h
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wsrep_priv.h
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wsrep_schema.h
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wsrep_server_service.h
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wsrep_server_state.h
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wsrep_sst.h
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wsrep_storage_service.h
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wsrep_thd.h
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wsrep_trans_observer.h
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wsrep_types.h
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wsrep_utils.h
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wsrep_var.h
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wsrep_xid.h
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xa.h
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Editing: thread_cache.h
/* Copyright (C) 2020 MariaDB Foundation 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 St, Fifth Floor, Boston, MA 02110-1335 USA */ /** MariaDB thread cache for "one thread per connection" scheduler. Thread cache allows to re-use threads (as well as THD objects) for subsequent connections. */ class Thread_cache { mutable mysql_cond_t COND_thread_cache; mutable mysql_cond_t COND_flush_thread_cache; mutable mysql_mutex_t LOCK_thread_cache; /** Queue of new connection requests. */ I_List<CONNECT> list; /** Number of threads parked in the cache. */ ulong cached_thread_count; /** Number of active flush requests. */ uint32_t kill_cached_threads; /** PFS stuff, only used during initialization. Unfortunately needs to survive till destruction. */ PSI_cond_key key_COND_thread_cache, key_COND_flush_thread_cache; PSI_mutex_key key_LOCK_thread_cache; public: void init() { #ifdef HAVE_PSI_INTERFACE PSI_cond_info conds[]= { { &key_COND_thread_cache, "COND_thread_cache", PSI_FLAG_GLOBAL }, { &key_COND_flush_thread_cache, "COND_flush_thread_cache", PSI_FLAG_GLOBAL } }; PSI_mutex_info mutexes[]= { { &key_LOCK_thread_cache, "LOCK_thread_cache", PSI_FLAG_GLOBAL } }; mysql_mutex_register("sql", mutexes, array_elements(mutexes)); mysql_cond_register("sql", conds, array_elements(conds)); #endif mysql_mutex_init(key_LOCK_thread_cache, &LOCK_thread_cache, MY_MUTEX_INIT_FAST); mysql_cond_init(key_COND_thread_cache, &COND_thread_cache, 0); mysql_cond_init(key_COND_flush_thread_cache, &COND_flush_thread_cache, 0); list.empty(); kill_cached_threads= 0; cached_thread_count= 0; } void destroy() { DBUG_ASSERT(cached_thread_count == 0); DBUG_ASSERT(list.is_empty()); mysql_cond_destroy(&COND_flush_thread_cache); mysql_cond_destroy(&COND_thread_cache); mysql_mutex_destroy(&LOCK_thread_cache); } /** Flushes thread cache. Awakes parked threads and requests them to shutdown. Waits until last parked thread leaves the cache. */ void flush() { mysql_mutex_lock(&LOCK_thread_cache); kill_cached_threads++; while (cached_thread_count) { mysql_cond_broadcast(&COND_thread_cache); mysql_cond_wait(&COND_flush_thread_cache, &LOCK_thread_cache); } kill_cached_threads--; mysql_mutex_unlock(&LOCK_thread_cache); } /** Flushes thread cache and forbids threads parking in the cache. This is a pre-shutdown hook. */ void final_flush() { kill_cached_threads++; flush(); } /** Requests parked thread to serve new connection. @return @retval true connection is enqueued and parked thread is about to serve it @retval false thread cache is empty */ bool enqueue(CONNECT *connect) { mysql_mutex_lock(&LOCK_thread_cache); if (cached_thread_count) { list.push_back(connect); cached_thread_count--; mysql_mutex_unlock(&LOCK_thread_cache); mysql_cond_signal(&COND_thread_cache); return true; } mysql_mutex_unlock(&LOCK_thread_cache); return false; } /** Parks thread in the cache. Thread execution is suspended until either of the following occurs: - thread is requested to serve new connection; - thread cache is flushed; - THREAD_CACHE_TIMEOUT elapsed. @return @retval pointer to CONNECT if requested to serve new connection @retval 0 if thread cache is flushed or on timeout */ CONNECT *park() { struct timespec abstime; CONNECT *connect; bool flushed= false; DBUG_ENTER("Thread_cache::park"); set_timespec(abstime, THREAD_CACHE_TIMEOUT); /* Delete the instrumentation for the job that just completed, before parking this pthread in the cache (blocked on COND_thread_cache). */ PSI_CALL_delete_current_thread(); #ifndef DBUG_OFF while (_db_is_pushed_()) _db_pop_(); #endif mysql_mutex_lock(&LOCK_thread_cache); if ((connect= list.get())) cached_thread_count++; else if (cached_thread_count < thread_cache_size && !kill_cached_threads) { /* Don't kill the thread, just put it in cache for reuse */ DBUG_PRINT("info", ("Adding thread to cache")); cached_thread_count++; for (;;) { int error= mysql_cond_timedwait(&COND_thread_cache, &LOCK_thread_cache, &abstime); flushed= kill_cached_threads; if ((connect= list.get())) break; else if (flushed || error == ETIMEDOUT || error == ETIME) { /* If timeout, end thread. If a new thread is requested, we will handle the call, even if we got a timeout (as we are already awake and free) */ cached_thread_count--; break; } } } mysql_mutex_unlock(&LOCK_thread_cache); if (flushed) mysql_cond_signal(&COND_flush_thread_cache); DBUG_RETURN(connect); } /** Returns the number of parked threads. */ ulong size() const { mysql_mutex_lock(&LOCK_thread_cache); ulong r= cached_thread_count; mysql_mutex_unlock(&LOCK_thread_cache); return r; } }; extern Thread_cache thread_cache;
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