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/******************************************************
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The server main program
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Created 10/10/1995 Heikki Tuuri
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*******************************************************/
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#include "sync0sync.h"
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#include "que0types.h"
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#include "trx0types.h"
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extern const char* srv_main_thread_op_info;
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/* Prefix used by MySQL to indicate pre-5.1 table name encoding */
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extern const char srv_mysql50_table_name_prefix[9];
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/* When this event is set the lock timeout and InnoDB monitor
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thread starts running */
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extern os_event_t srv_lock_timeout_thread_event;
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/* If the last data file is auto-extended, we add this many pages to it
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#define SRV_AUTO_EXTEND_INCREMENT \
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(srv_auto_extend_increment * ((1024 * 1024) / UNIV_PAGE_SIZE))
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/* This is set to TRUE if the MySQL user has set it in MySQL */
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extern ibool srv_lower_case_table_names;
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/* Mutex for locking srv_monitor_file */
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extern mutex_t srv_monitor_file_mutex;
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/* Temporary file for innodb monitor output */
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extern FILE* srv_monitor_file;
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/* Mutex for locking srv_dict_tmpfile.
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This mutex has a very high rank; threads reserving it should not
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be holding any InnoDB latches. */
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extern mutex_t srv_dict_tmpfile_mutex;
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/* Temporary file for output from the data dictionary */
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extern FILE* srv_dict_tmpfile;
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/* Mutex for locking srv_misc_tmpfile.
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This mutex has a very low rank; threads reserving it should not
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acquire any further latches or sleep before releasing this one. */
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extern mutex_t srv_misc_tmpfile_mutex;
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/* Temporary file for miscellanous diagnostic output */
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extern FILE* srv_misc_tmpfile;
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/* Server parameters which are read from the initfile */
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extern char* srv_data_home;
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#ifdef UNIV_LOG_ARCHIVE
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extern char* srv_arch_dir;
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#endif /* UNIV_LOG_ARCHIVE */
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/* store to its own file each table created by an user; data
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dictionary tables are in the system tablespace 0 */
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extern my_bool srv_file_per_table;
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/* The file format to use on new *.ibd files. */
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extern ulint srv_file_format;
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/* Whether to check file format during startup.*/
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extern ulint srv_check_file_format_at_startup;
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/* Place locks to records only i.e. do not use next-key locking except
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on duplicate key checking and foreign key checking */
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extern ibool srv_locks_unsafe_for_binlog;
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extern ulint srv_n_data_files;
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extern char** srv_data_file_names;
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extern ulint* srv_data_file_sizes;
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extern ulint* srv_data_file_is_raw_partition;
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extern ibool srv_auto_extend_last_data_file;
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extern ulint srv_last_file_size_max;
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extern ulong srv_auto_extend_increment;
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extern ibool srv_created_new_raw;
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extern char** srv_log_group_home_dirs;
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extern ulint srv_n_log_groups;
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extern ulint srv_n_log_files;
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extern ulint srv_log_file_size;
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extern ulint srv_log_buffer_size;
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extern ulong srv_flush_log_at_trx_commit;
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/* The sort order table of the MySQL latin1_swedish_ci character set
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extern const byte* srv_latin1_ordering;
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extern ulong srv_buf_pool_size; /* requested size in bytes */
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extern ulong srv_buf_pool_old_size; /* previously requested size */
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extern ulong srv_buf_pool_curr_size; /* current size in bytes */
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extern ulint srv_mem_pool_size;
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extern ulint srv_lock_table_size;
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extern ulint srv_n_file_io_threads;
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#ifdef UNIV_LOG_ARCHIVE
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extern ibool srv_log_archive_on;
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extern ibool srv_archive_recovery;
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extern dulint srv_archive_recovery_limit_lsn;
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#endif /* UNIV_LOG_ARCHIVE */
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extern ulint srv_lock_wait_timeout;
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extern char* srv_file_flush_method_str;
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extern ulint srv_unix_file_flush_method;
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extern ulint srv_win_file_flush_method;
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extern ulint srv_max_n_open_files;
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extern ulint srv_max_dirty_pages_pct;
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extern ulint srv_force_recovery;
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extern ulong srv_thread_concurrency;
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extern ulong srv_commit_concurrency;
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extern ulint srv_max_n_threads;
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extern lint srv_conc_n_threads;
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extern ulint srv_fast_shutdown; /* If this is 1, do not do a
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purge and index buffer merge.
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If this 2, do not even flush the
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buffer pool to data files at the
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shutdown: we effectively 'crash'
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InnoDB (but lose no committed
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extern ibool srv_innodb_status;
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extern ibool srv_stats_on_metadata;
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extern ibool srv_use_doublewrite_buf;
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extern ibool srv_use_checksums;
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extern ibool srv_set_thread_priorities;
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extern int srv_query_thread_priority;
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extern ulong srv_max_buf_pool_modified_pct;
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extern ulong srv_max_purge_lag;
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extern ulint srv_replication_delay;
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/*-------------------------------------------*/
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extern ulint srv_n_rows_inserted;
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extern ulint srv_n_rows_updated;
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extern ulint srv_n_rows_deleted;
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extern ulint srv_n_rows_read;
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extern ibool srv_print_innodb_monitor;
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extern ibool srv_print_innodb_lock_monitor;
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extern ibool srv_print_innodb_tablespace_monitor;
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extern ibool srv_print_verbose_log;
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extern ibool srv_print_innodb_table_monitor;
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extern ibool srv_lock_timeout_and_monitor_active;
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extern ibool srv_error_monitor_active;
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extern ulong srv_n_spin_wait_rounds;
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extern ulong srv_n_free_tickets_to_enter;
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extern ulong srv_thread_sleep_delay;
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extern ulint srv_spin_wait_delay;
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extern ibool srv_priority_boost;
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extern ulint srv_mem_pool_size;
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extern ulint srv_lock_table_size;
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extern ibool srv_print_thread_releases;
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extern ibool srv_print_lock_waits;
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extern ibool srv_print_buf_io;
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extern ibool srv_print_log_io;
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extern ibool srv_print_latch_waits;
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#else /* UNIV_DEBUG */
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# define srv_print_thread_releases FALSE
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# define srv_print_lock_waits FALSE
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# define srv_print_buf_io FALSE
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# define srv_print_log_io FALSE
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# define srv_print_latch_waits FALSE
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#endif /* UNIV_DEBUG */
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extern ulint srv_activity_count;
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extern ulint srv_fatal_semaphore_wait_threshold;
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extern ulint srv_dml_needed_delay;
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extern mutex_t* kernel_mutex_temp;/* mutex protecting the server, trx structs,
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query threads, and lock table: we allocate
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it from dynamic memory to get it to the
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same DRAM page as other hotspot semaphores */
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#define kernel_mutex (*kernel_mutex_temp)
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#define SRV_MAX_N_IO_THREADS 100
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/* Array of English strings describing the current state of an
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i/o handler thread */
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extern const char* srv_io_thread_op_info[];
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extern const char* srv_io_thread_function[];
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/* the number of the log write requests done */
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extern ulint srv_log_write_requests;
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/* the number of physical writes to the log performed */
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extern ulint srv_log_writes;
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/* amount of data written to the log files in bytes */
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extern ulint srv_os_log_written;
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/* amount of writes being done to the log files */
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extern ulint srv_os_log_pending_writes;
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/* we increase this counter, when there we don't have enough space in the
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log buffer and have to flush it */
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extern ulint srv_log_waits;
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/* variable that counts amount of data read in total (in bytes) */
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extern ulint srv_data_read;
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/* here we count the amount of data written in total (in bytes) */
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extern ulint srv_data_written;
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/* this variable counts the amount of times, when the doublewrite buffer
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extern ulint srv_dblwr_writes;
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/* here we store the number of pages that have been flushed to the
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doublewrite buffer */
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extern ulint srv_dblwr_pages_written;
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/* in this variable we store the number of write requests issued */
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extern ulint srv_buf_pool_write_requests;
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/* here we store the number of times when we had to wait for a free page
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in the buffer pool. It happens when the buffer pool is full and we need
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to make a flush, in order to be able to read or create a page. */
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extern ulint srv_buf_pool_wait_free;
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/* variable to count the number of pages that were written from the
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buffer pool to disk */
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extern ulint srv_buf_pool_flushed;
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/* variable to count the number of buffer pool reads that led to the
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reading of a disk page */
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extern ulint srv_buf_pool_reads;
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/* variable to count the number of sequential read-aheads were done */
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extern ulint srv_read_ahead_seq;
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/* variable to count the number of random read-aheads were done */
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extern ulint srv_read_ahead_rnd;
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/* In this structure we store status variables to be passed to MySQL */
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typedef struct export_var_struct export_struc;
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extern export_struc export_vars;
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typedef struct srv_sys_struct srv_sys_t;
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/* The server system */
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extern srv_sys_t* srv_sys;
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/* Alternatives for the file flush option in Unix; see the InnoDB manual
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about what these mean */
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#define SRV_UNIX_FSYNC 1 /* This is the default */
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#define SRV_UNIX_O_DSYNC 2
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#define SRV_UNIX_LITTLESYNC 3
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#define SRV_UNIX_NOSYNC 4
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#define SRV_UNIX_O_DIRECT 5
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/* Alternatives for file i/o in Windows */
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#define SRV_WIN_IO_NORMAL 1
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#define SRV_WIN_IO_UNBUFFERED 2 /* This is the default */
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/* Alternatives for srv_force_recovery. Non-zero values are intended
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to help the user get a damaged database up so that he can dump intact
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tables and rows with SELECT INTO OUTFILE. The database must not otherwise
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be used with these options! A bigger number below means that all precautions
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of lower numbers are included. */
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#define SRV_FORCE_IGNORE_CORRUPT 1 /* let the server run even if it
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detects a corrupt page */
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#define SRV_FORCE_NO_BACKGROUND 2 /* prevent the main thread from
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running: if a crash would occur
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in purge, this prevents it */
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#define SRV_FORCE_NO_TRX_UNDO 3 /* do not run trx rollback after
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#define SRV_FORCE_NO_IBUF_MERGE 4 /* prevent also ibuf operations:
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if they would cause a crash, better
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#define SRV_FORCE_NO_UNDO_LOG_SCAN 5 /* do not look at undo logs when
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starting the database: InnoDB will
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treat even incomplete transactions
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#define SRV_FORCE_NO_LOG_REDO 6 /* do not do the log roll-forward
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in connection with recovery */
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/** Types of threads existing in the system. */
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enum srv_thread_type {
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SRV_COM = 1, /**< threads serving communication and queries */
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SRV_CONSOLE, /**< thread serving console */
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SRV_WORKER, /**< threads serving parallelized queries and
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queries released from lock wait */
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/* Utility threads */
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SRV_BUFFER, /**< thread flushing dirty buffer blocks */
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SRV_RECOVERY, /**< threads finishing a recovery */
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SRV_INSERT, /**< thread flushing the insert buffer to disk */
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SRV_MASTER /**< the master thread, (whose type number must
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/*************************************************************************
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Boots Innobase server. */
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/* out: DB_SUCCESS or error code */
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/*************************************************************************
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Initializes the server. */
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/*************************************************************************
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Frees the OS fast mutex created in srv_boot(). */
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/*************************************************************************
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Initializes the synchronization primitives, memory system, and the thread
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srv_general_init(void);
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/*==================*/
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/*************************************************************************
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Gets the number of threads in the system. */
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srv_get_n_threads(void);
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/*===================*/
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/*************************************************************************
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Returns the calling thread type. */
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srv_get_thread_type(void);
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/*=====================*/
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/* out: SRV_COM, ... */
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/*************************************************************************
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Sets the info describing an i/o thread current state. */
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srv_set_io_thread_op_info(
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/*======================*/
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ulint i, /* in: the 'segment' of the i/o thread */
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const char* str); /* in: constant char string describing the
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/*************************************************************************
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Releases threads of the type given from suspension in the thread table.
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NOTE! The server mutex has to be reserved by the caller! */
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/* out: number of threads
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released: this may be < n if
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not enough threads were
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suspended at the moment */
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enum srv_thread_type type, /* in: thread type */
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ulint n); /* in: number of threads to release */
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/*************************************************************************
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The master thread controlling the server. */
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/* out: a dummy parameter */
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void* arg); /* in: a dummy parameter required by
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/***********************************************************************
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Tells the Innobase server that there has been activity in the database
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and wakes up the master thread if it is suspended (not sleeping). Used
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in the MySQL interface. Note that there is a small chance that the master
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thread stays suspended (we do not protect our operation with the kernel
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mutex, for performace reasons). */
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srv_active_wake_master_thread(void);
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/*===============================*/
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/***********************************************************************
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Wakes up the master thread if it is suspended or being suspended. */
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srv_wake_master_thread(void);
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/*========================*/
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/*************************************************************************
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Puts an OS thread to wait if there are too many concurrent threads
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(>= srv_thread_concurrency) inside InnoDB. The threads wait in a FIFO queue. */
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srv_conc_enter_innodb(
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/*==================*/
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trx_t* trx); /* in: transaction object associated with the
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/*************************************************************************
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This lets a thread enter InnoDB regardless of the number of threads inside
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InnoDB. This must be called when a thread ends a lock wait. */
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srv_conc_force_enter_innodb(
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/*========================*/
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trx_t* trx); /* in: transaction object associated with the
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/*************************************************************************
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This must be called when a thread exits InnoDB in a lock wait or at the
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end of an SQL statement. */
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srv_conc_force_exit_innodb(
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/*=======================*/
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trx_t* trx); /* in: transaction object associated with the
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/*************************************************************************
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This must be called when a thread exits InnoDB. */
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srv_conc_exit_innodb(
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/*=================*/
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trx_t* trx); /* in: transaction object associated with the
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/*******************************************************************
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Puts a MySQL OS thread to wait for a lock to be released. If an error
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occurs during the wait trx->error_state associated with thr is
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!= DB_SUCCESS when we return. DB_LOCK_WAIT_TIMEOUT and DB_DEADLOCK
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are possible errors. DB_DEADLOCK is returned if selective deadlock
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resolution chose this transaction as a victim. */
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srv_suspend_mysql_thread(
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/*=====================*/
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que_thr_t* thr); /* in: query thread associated with the MySQL
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/************************************************************************
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Releases a MySQL OS thread waiting for a lock to be released, if the
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thread is already suspended. */
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srv_release_mysql_thread_if_suspended(
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/*==================================*/
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que_thr_t* thr); /* in: query thread associated with the
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/*************************************************************************
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A thread which wakes up threads whose lock wait may have lasted too long.
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This also prints the info output by various InnoDB monitors. */
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srv_lock_timeout_and_monitor_thread(
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/*================================*/
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/* out: a dummy parameter */
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void* arg); /* in: a dummy parameter required by
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/*************************************************************************
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A thread which prints warnings about semaphore waits which have lasted
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too long. These can be used to track bugs which cause hangs. */
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srv_error_monitor_thread(
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/*=====================*/
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/* out: a dummy parameter */
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void* arg); /* in: a dummy parameter required by
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/**********************************************************************
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Outputs to a file the output of the InnoDB Monitor. */
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srv_printf_innodb_monitor(
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/*======================*/
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FILE* file, /* in: output stream */
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ulint* trx_start, /* out: file position of the start of
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the list of active transactions */
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ulint* trx_end); /* out: file position of the end of
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the list of active transactions */
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/**********************************************************************
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Function to pass InnoDB status variables to MySQL */
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srv_export_innodb_status(void);
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/*=====================*/
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/* Thread slot in the thread table */
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typedef struct srv_slot_struct srv_slot_t;
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/* Thread table is an array of slots */
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typedef srv_slot_t srv_table_t;
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/* In this structure we store status variables to be passed to MySQL */
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struct export_var_struct{
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ulint innodb_data_pending_reads;
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ulint innodb_data_pending_writes;
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ulint innodb_data_pending_fsyncs;
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ulint innodb_data_fsyncs;
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ulint innodb_data_read;
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ulint innodb_data_writes;
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ulint innodb_data_written;
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ulint innodb_data_reads;
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ulint innodb_buffer_pool_pages_total;
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ulint innodb_buffer_pool_pages_data;
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ulint innodb_buffer_pool_pages_dirty;
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ulint innodb_buffer_pool_pages_misc;
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ulint innodb_buffer_pool_pages_free;
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ulint innodb_buffer_pool_pages_latched;
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ulint innodb_buffer_pool_read_requests;
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ulint innodb_buffer_pool_reads;
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ulint innodb_buffer_pool_wait_free;
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ulint innodb_buffer_pool_pages_flushed;
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ulint innodb_buffer_pool_write_requests;
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ulint innodb_buffer_pool_read_ahead_seq;
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ulint innodb_buffer_pool_read_ahead_rnd;
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ulint innodb_dblwr_pages_written;
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ulint innodb_dblwr_writes;
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ulint innodb_log_waits;
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ulint innodb_log_write_requests;
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ulint innodb_log_writes;
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ulint innodb_os_log_written;
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ulint innodb_os_log_fsyncs;
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ulint innodb_os_log_pending_writes;
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ulint innodb_os_log_pending_fsyncs;
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ulint innodb_page_size;
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ulint innodb_pages_created;
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ulint innodb_pages_read;
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ulint innodb_pages_written;
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ulint innodb_row_lock_waits;
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ulint innodb_row_lock_current_waits;
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ib_int64_t innodb_row_lock_time;
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ulint innodb_row_lock_time_avg;
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ulint innodb_row_lock_time_max;
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ulint innodb_rows_read;
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ulint innodb_rows_inserted;
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ulint innodb_rows_updated;
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ulint innodb_rows_deleted;
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/* The server system struct */
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struct srv_sys_struct{
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srv_table_t* threads; /* server thread table */
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UT_LIST_BASE_NODE_T(que_thr_t)
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tasks; /* task queue */
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dict_index_t* dummy_ind1; /* dummy index for old-style
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supremum and infimum records */
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dict_index_t* dummy_ind2; /* dummy index for new-style
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supremum and infimum records */
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extern ulint srv_n_threads_active[];
added
removed
include/srv0srv.h
