path: root/sql/mysqld.h

/* Copyright (c) 2006, 2012, Oracle and/or its affiliates. All rights reserved.

   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  02110-1301  USA */

#ifndef MYSQLD_INCLUDED
#define MYSQLD_INCLUDED

#include "my_global.h" /* MYSQL_PLUGIN_IMPORT, FN_REFLEN, FN_EXTLEN */
#include "sql_bitmap.h"                         /* Bitmap */
#include "my_decimal.h"                         /* my_decimal */
#include "mysql_com.h"                     /* SERVER_VERSION_LENGTH */
#include "my_atomic.h"                     /* my_atomic_rwlock_t */
#include "mysql/psi/mysql_file.h"          /* MYSQL_FILE */
#include "sql_list.h"                      /* I_List */

class THD;
struct handlerton;
class Time_zone;

struct scheduler_functions;

typedef struct st_mysql_const_lex_string LEX_CSTRING;
typedef struct st_mysql_show_var SHOW_VAR;

#if MAX_INDEXES <= 64
typedef Bitmap<64>  key_map;          /* Used for finding keys */
#else
typedef Bitmap<((MAX_INDEXES+7)/8*8)> key_map; /* Used for finding keys */
#endif

	/* Bits from testflag */
#define TEST_PRINT_CACHED_TABLES 1
#define TEST_NO_KEY_GROUP	 2
#define TEST_MIT_THREAD		4
#define TEST_BLOCKING		8
#define TEST_KEEP_TMP_TABLES	16
#define TEST_READCHECK		64	/**< Force use of readcheck */
#define TEST_NO_EXTRA		128
#define TEST_CORE_ON_SIGNAL	256	/**< Give core if signal */
#define TEST_SIGINT		1024	/**< Allow sigint on threads */
#define TEST_SYNCHRONIZATION    2048    /**< get server to do sleep in
                                           some places */
/* Function prototypes */
void kill_mysql(void);
void close_connection(THD *thd, uint sql_errno= 0);
void handle_connection_in_main_thread(THD *thd);
void create_thread_to_handle_connection(THD *thd);
void delete_running_thd(THD *thd);
void unlink_thd(THD *thd);
bool one_thread_per_connection_end(THD *thd, bool put_in_cache);
void flush_thread_cache();
void refresh_status(THD *thd);
bool is_secure_file_path(char *path);

extern "C" MYSQL_PLUGIN_IMPORT CHARSET_INFO *system_charset_info;
extern MYSQL_PLUGIN_IMPORT CHARSET_INFO *files_charset_info ;
extern MYSQL_PLUGIN_IMPORT CHARSET_INFO *national_charset_info;
extern MYSQL_PLUGIN_IMPORT CHARSET_INFO *table_alias_charset;

/**
  Character set of the buildin error messages loaded from errmsg.sys.
*/
extern CHARSET_INFO *error_message_charset_info;

extern CHARSET_INFO *character_set_filesystem;

extern MY_BITMAP temp_pool;
extern bool opt_large_files, server_id_supplied;
extern bool opt_update_log, opt_bin_log, opt_error_log;
extern my_bool opt_log, opt_slow_log, opt_bootstrap;
extern my_bool opt_backup_history_log;
extern my_bool opt_backup_progress_log;
extern ulonglong log_output_options;
extern ulong log_backup_output_options;
extern my_bool opt_log_queries_not_using_indexes;
extern bool opt_disable_networking, opt_skip_show_db;
extern bool opt_skip_name_resolve;
extern bool opt_ignore_builtin_innodb;
extern my_bool opt_character_set_client_handshake;
extern bool volatile abort_loop;
extern bool in_bootstrap;
extern uint connection_count;
extern my_bool opt_safe_user_create;
extern my_bool opt_safe_show_db, opt_local_infile, opt_myisam_use_mmap;
extern my_bool opt_slave_compressed_protocol, use_temp_pool;
extern ulong slave_exec_mode_options;
extern ulong slave_retried_transactions;
extern ulonglong slave_type_conversions_options;
extern my_bool read_only, opt_readonly;
extern my_bool lower_case_file_system;
extern my_bool opt_enable_named_pipe, opt_sync_frm, opt_allow_suspicious_udfs;
extern my_bool opt_secure_auth;
extern char* opt_secure_file_priv;
extern char* opt_secure_backup_file_priv;
extern size_t opt_secure_backup_file_priv_len;
extern my_bool opt_log_slow_admin_statements, opt_log_slow_slave_statements;
extern my_bool sp_automatic_privileges, opt_noacl;
extern ulong use_stat_tables;
extern my_bool opt_old_style_user_limits, trust_function_creators;
extern uint opt_crash_binlog_innodb;
extern char *shared_memory_base_name, *mysqld_unix_port;
extern my_bool opt_enable_shared_memory;
extern ulong opt_replicate_events_marked_for_skip;
extern char *default_tz_name;
extern Time_zone *default_tz;
extern char *default_storage_engine;
extern bool opt_endinfo, using_udf_functions;
extern my_bool locked_in_memory;
extern bool opt_using_transactions;
extern ulong max_long_data_size;
extern ulong current_pid;
extern ulong expire_logs_days;
extern my_bool relay_log_recovery;
extern uint sync_binlog_period, sync_relaylog_period, 
            sync_relayloginfo_period, sync_masterinfo_period;
extern ulong opt_tc_log_size, tc_log_max_pages_used, tc_log_page_size;
extern ulong tc_log_page_waits;
extern my_bool relay_log_purge, opt_innodb_safe_binlog, opt_innodb;
extern my_bool relay_log_recovery;
extern uint test_flags,select_errors,ha_open_options;
extern uint protocol_version, mysqld_port, dropping_tables;
extern ulong delay_key_write_options;
extern char *opt_logname, *opt_slow_logname, *opt_bin_logname, 
            *opt_relay_logname;
extern char *opt_backup_history_logname, *opt_backup_progress_logname,
            *opt_backup_settings_name;
extern const char *log_output_str;
extern const char *log_backup_output_str;
extern char *mysql_home_ptr, *pidfile_name_ptr;
extern char glob_hostname[FN_REFLEN], mysql_home[FN_REFLEN];
extern char pidfile_name[FN_REFLEN], system_time_zone[30], *opt_init_file;
extern char default_logfile_name[FN_REFLEN];
extern char log_error_file[FN_REFLEN], *opt_tc_log_file;
extern const double log_10[309];
extern ulonglong keybuff_size;
extern ulonglong thd_startup_options;
extern ulong thread_id;
extern ulong binlog_cache_use, binlog_cache_disk_use;
extern ulong binlog_stmt_cache_use, binlog_stmt_cache_disk_use;
extern ulong aborted_threads,aborted_connects;
extern ulong delayed_insert_timeout;
extern ulong delayed_insert_limit, delayed_queue_size;
extern ulong delayed_insert_threads, delayed_insert_writes;
extern ulong delayed_rows_in_use,delayed_insert_errors;
extern int32 slave_open_temp_tables;
extern ulonglong query_cache_size;
extern ulong query_cache_min_res_unit;
extern ulong slow_launch_threads, slow_launch_time;
extern ulong table_cache_size, table_def_size;
extern MYSQL_PLUGIN_IMPORT ulong max_connections;
extern ulong max_connect_errors, connect_timeout;
extern my_bool slave_allow_batching;
extern my_bool allow_slave_start;
extern LEX_CSTRING reason_slave_blocked;
extern ulong slave_trans_retries;
extern uint  slave_net_timeout;
extern int max_user_connections;
extern ulong what_to_log,flush_time;
extern ulong max_prepared_stmt_count, prepared_stmt_count;
extern ulong open_files_limit;
extern ulonglong binlog_cache_size, binlog_stmt_cache_size;
extern ulonglong max_binlog_cache_size, max_binlog_stmt_cache_size;
extern ulong max_binlog_size;
extern ulong slave_max_allowed_packet;
extern ulong opt_binlog_rows_event_max_size;
extern ulong rpl_recovery_rank, thread_cache_size;
extern ulong stored_program_cache_size;
extern ulong opt_slave_parallel_threads;
extern ulong opt_slave_parallel_max_queued;
extern ulong opt_binlog_commit_wait_count;
extern ulong opt_binlog_commit_wait_usec;
extern ulong back_log;
extern ulong executed_events;
extern char language[FN_REFLEN];
extern "C" MYSQL_PLUGIN_IMPORT ulong server_id;
extern ulong concurrency;
extern time_t server_start_time, flush_status_time;
extern char *opt_mysql_tmpdir, mysql_charsets_dir[];
extern int mysql_unpacked_real_data_home_len;
extern MYSQL_PLUGIN_IMPORT MY_TMPDIR mysql_tmpdir_list;
extern const char *first_keyword, *delayed_user, *binary_keyword;
extern MYSQL_PLUGIN_IMPORT const char  *my_localhost;
extern MYSQL_PLUGIN_IMPORT const char **errmesg;			/* Error messages */
extern const char *myisam_recover_options_str;
extern const char *in_left_expr_name, *in_additional_cond, *in_having_cond;
extern SHOW_VAR status_vars[];
extern struct system_variables max_system_variables;
extern struct system_status_var global_status_var;
extern struct my_rnd_struct sql_rand;
extern const char *opt_date_time_formats[];
extern handlerton *partition_hton;
extern handlerton *myisam_hton;
extern handlerton *heap_hton;
extern const char *load_default_groups[];
extern struct my_option my_long_options[];
extern int mysqld_server_started, mysqld_server_initialized;
extern "C" MYSQL_PLUGIN_IMPORT int orig_argc;
extern "C" MYSQL_PLUGIN_IMPORT char **orig_argv;
extern pthread_attr_t connection_attrib;
extern MYSQL_FILE *bootstrap_file;
extern my_bool old_mode;
extern LEX_STRING opt_init_connect, opt_init_slave;
extern int bootstrap_error;
extern I_List<THD> threads;
extern char err_shared_dir[];

/*
  THR_MALLOC is a key which will be used to set/get MEM_ROOT** for a thread,
  using my_pthread_setspecific_ptr()/my_thread_getspecific_ptr().
*/
extern pthread_key(MEM_ROOT**,THR_MALLOC);

#ifdef HAVE_PSI_INTERFACE
#ifdef HAVE_MMAP
extern PSI_mutex_key key_PAGE_lock, key_LOCK_sync, key_LOCK_active,
       key_LOCK_pool, key_LOCK_pending_checkpoint;
#endif /* HAVE_MMAP */

#ifdef HAVE_OPENSSL
extern PSI_mutex_key key_LOCK_des_key_file;
#endif

extern PSI_mutex_key key_BINLOG_LOCK_index, key_BINLOG_LOCK_xid_list,
  key_BINLOG_LOCK_binlog_background_thread,
  key_delayed_insert_mutex, key_hash_filo_lock, key_LOCK_active_mi,
  key_LOCK_connection_count, key_LOCK_crypt, key_LOCK_delayed_create,
  key_LOCK_delayed_insert, key_LOCK_delayed_status, key_LOCK_error_log,
  key_LOCK_gdl, key_LOCK_global_system_variables,
  key_LOCK_logger, key_LOCK_manager,
  key_LOCK_prepared_stmt_count,
  key_LOCK_rpl_status, key_LOCK_server_started, key_LOCK_status,
  key_LOCK_table_share, key_LOCK_thd_data,
  key_LOCK_user_conn, key_LOG_LOCK_log,
  key_master_info_data_lock, key_master_info_run_lock,
  key_master_info_sleep_lock,
  key_mutex_slave_reporting_capability_err_lock, key_relay_log_info_data_lock,
  key_relay_log_info_log_space_lock, key_relay_log_info_run_lock,
  key_rpl_group_info_sleep_lock,
  key_structure_guard_mutex, key_TABLE_SHARE_LOCK_ha_data,
  key_LOCK_error_messages, key_LOCK_thread_count, key_PARTITION_LOCK_auto_inc;
extern PSI_mutex_key key_RELAYLOG_LOCK_index;
extern PSI_mutex_key key_LOCK_slave_state, key_LOCK_binlog_state,
  key_LOCK_rpl_thread, key_LOCK_rpl_thread_pool, key_LOCK_parallel_entry;

extern PSI_mutex_key key_LOCK_stats,
  key_LOCK_global_user_client_stats, key_LOCK_global_table_stats,
  key_LOCK_global_index_stats, key_LOCK_wakeup_ready, key_LOCK_wait_commit;
extern PSI_mutex_key key_LOCK_gtid_waiting;

extern PSI_rwlock_key key_rwlock_LOCK_grant, key_rwlock_LOCK_logger,
  key_rwlock_LOCK_sys_init_connect, key_rwlock_LOCK_sys_init_slave,
  key_rwlock_LOCK_system_variables_hash, key_rwlock_query_cache_query_lock;

#ifdef HAVE_MMAP
extern PSI_cond_key key_PAGE_cond, key_COND_active, key_COND_pool;
#endif /* HAVE_MMAP */

extern PSI_cond_key key_BINLOG_COND_xid_list, key_BINLOG_update_cond,
  key_BINLOG_COND_binlog_background_thread,
  key_BINLOG_COND_binlog_background_thread_end,
  key_COND_cache_status_changed, key_COND_manager,
  key_COND_rpl_status, key_COND_server_started,
  key_delayed_insert_cond, key_delayed_insert_cond_client,
  key_item_func_sleep_cond, key_master_info_data_cond,
  key_master_info_start_cond, key_master_info_stop_cond,
  key_master_info_sleep_cond,
  key_relay_log_info_data_cond, key_relay_log_info_log_space_cond,
  key_relay_log_info_start_cond, key_relay_log_info_stop_cond,
  key_rpl_group_info_sleep_cond,
  key_TABLE_SHARE_cond, key_user_level_lock_cond,
  key_COND_thread_count, key_COND_thread_cache, key_COND_flush_thread_cache;
extern PSI_cond_key key_RELAYLOG_update_cond, key_COND_wakeup_ready,
  key_COND_wait_commit;
extern PSI_cond_key key_RELAYLOG_COND_queue_busy;
extern PSI_cond_key key_TC_LOG_MMAP_COND_queue_busy;
extern PSI_cond_key key_COND_rpl_thread, key_COND_rpl_thread_pool,
  key_COND_parallel_entry;
extern PSI_cond_key key_COND_wait_gtid;

extern PSI_thread_key key_thread_bootstrap, key_thread_delayed_insert,
  key_thread_handle_manager, key_thread_kill_server, key_thread_main,
  key_thread_one_connection, key_thread_signal_hand, key_thread_slave_init,
  key_rpl_parallel_thread;

extern PSI_file_key key_file_binlog, key_file_binlog_index, key_file_casetest,
  key_file_dbopt, key_file_des_key_file, key_file_ERRMSG, key_select_to_file,
  key_file_fileparser, key_file_frm, key_file_global_ddl_log, key_file_load,
  key_file_loadfile, key_file_log_event_data, key_file_log_event_info,
  key_file_master_info, key_file_misc, key_file_partition,
  key_file_pid, key_file_relay_log_info, key_file_send_file, key_file_tclog,
  key_file_trg, key_file_trn, key_file_init;
extern PSI_file_key key_file_query_log, key_file_slow_log;
extern PSI_file_key key_file_relaylog, key_file_relaylog_index;
extern PSI_file_key key_file_binlog_state;

void init_server_psi_keys();
#endif /* HAVE_PSI_INTERFACE */

#ifndef __WIN__
extern pthread_t signal_thread;
#endif

#ifdef HAVE_OPENSSL
extern struct st_VioSSLFd * ssl_acceptor_fd;
#endif /* HAVE_OPENSSL */

/*
  The following variables were under INNODB_COMPABILITY_HOOKS
 */
extern my_bool opt_large_pages;
extern uint opt_large_page_size;
extern char lc_messages_dir[FN_REFLEN];
extern char *lc_messages_dir_ptr, *log_error_file_ptr;
extern MYSQL_PLUGIN_IMPORT char reg_ext[FN_EXTLEN];
extern MYSQL_PLUGIN_IMPORT uint reg_ext_length;
extern MYSQL_PLUGIN_IMPORT uint lower_case_table_names;
extern MYSQL_PLUGIN_IMPORT bool mysqld_embedded;
extern ulong specialflag;
extern uint mysql_data_home_len;
extern uint mysql_real_data_home_len;
extern const char *mysql_real_data_home_ptr;
extern ulong thread_handling;
extern "C" MYSQL_PLUGIN_IMPORT char server_version[SERVER_VERSION_LENGTH];
extern MYSQL_PLUGIN_IMPORT char mysql_real_data_home[];
extern char mysql_unpacked_real_data_home[];
extern MYSQL_PLUGIN_IMPORT struct system_variables global_system_variables;
extern char default_logfile_name[FN_REFLEN];

#define mysql_tmpdir (my_tmpdir(&mysql_tmpdir_list))

extern MYSQL_PLUGIN_IMPORT const key_map key_map_empty;
extern MYSQL_PLUGIN_IMPORT key_map key_map_full;          /* Should be threaded as const */

/*
  Server mutex locks and condition variables.
 */
extern mysql_mutex_t
       LOCK_item_func_sleep, LOCK_status,
       LOCK_error_log, LOCK_delayed_insert, LOCK_short_uuid_generator,
       LOCK_delayed_status, LOCK_delayed_create, LOCK_crypt, LOCK_timezone,
       LOCK_slave_list, LOCK_active_mi, LOCK_manager,
       LOCK_global_system_variables, LOCK_user_conn,
       LOCK_prepared_stmt_count, LOCK_error_messages, LOCK_connection_count;
extern MYSQL_PLUGIN_IMPORT mysql_mutex_t LOCK_thread_count;
#ifdef HAVE_OPENSSL
extern mysql_mutex_t LOCK_des_key_file;
#endif
extern mysql_mutex_t LOCK_server_started;
extern mysql_cond_t COND_server_started;
extern mysql_rwlock_t LOCK_grant, LOCK_sys_init_connect, LOCK_sys_init_slave;
extern mysql_rwlock_t LOCK_system_variables_hash;
extern mysql_cond_t COND_thread_count;
extern mysql_cond_t COND_manager;
extern int32 thread_running;
extern int32 thread_count;
extern my_atomic_rwlock_t thread_running_lock, thread_count_lock;
extern my_atomic_rwlock_t slave_executed_entries_lock;

extern char *opt_ssl_ca, *opt_ssl_capath, *opt_ssl_cert, *opt_ssl_cipher,
            *opt_ssl_key;

extern MYSQL_PLUGIN_IMPORT pthread_key(THD*, THR_THD);

#ifdef MYSQL_SERVER

/**
  only options that need special treatment in get_one_option() deserve
  to be listed below
*/
enum options_mysqld
{
  OPT_to_set_the_start_number=256,
  OPT_BIND_ADDRESS,
  OPT_BINLOG_DO_DB,
  OPT_BINLOG_FORMAT,
  OPT_BINLOG_IGNORE_DB,
  OPT_BIN_LOG,
  OPT_BOOTSTRAP,
  OPT_CONSOLE,
  OPT_DEBUG_SYNC_TIMEOUT,
  OPT_DELAY_KEY_WRITE_ALL,
  OPT_DEPRECATED_OPTION,
  OPT_ENGINE_CONDITION_PUSHDOWN,
  OPT_IGNORE_DB_DIRECTORY,
  OPT_ISAM_LOG,
  OPT_KEY_BUFFER_SIZE,
  OPT_KEY_CACHE_AGE_THRESHOLD,
  OPT_KEY_CACHE_BLOCK_SIZE,
  OPT_KEY_CACHE_DIVISION_LIMIT,
  OPT_KEY_CACHE_PARTITIONS,
  OPT_LOG_BASENAME,
  OPT_LOG_ERROR,
  OPT_LOWER_CASE_TABLE_NAMES,
  OPT_MAX_LONG_DATA_SIZE,
  OPT_ONE_THREAD,
  OPT_POOL_OF_THREADS,
  OPT_REPLICATE_DO_DB,
  OPT_REPLICATE_DO_TABLE,
  OPT_REPLICATE_IGNORE_DB,
  OPT_REPLICATE_IGNORE_TABLE,
  OPT_REPLICATE_REWRITE_DB,
  OPT_REPLICATE_WILD_DO_TABLE,
  OPT_REPLICATE_WILD_IGNORE_TABLE,
  OPT_SAFE,
  OPT_SERVER_ID,
  OPT_SKIP_HOST_CACHE,
  OPT_SKIP_LOCK,
  OPT_SKIP_PRIOR,
  OPT_SKIP_RESOLVE,
  OPT_SKIP_STACK_TRACE,
  OPT_SKIP_SYMLINKS,
  OPT_SLOW_QUERY_LOG,
  OPT_SSL_CA,
  OPT_SSL_CAPATH,
  OPT_SSL_CERT,
  OPT_SSL_CIPHER,
  OPT_SSL_KEY,
  OPT_UPDATE_LOG,
  OPT_WANT_CORE,
  OPT_which_is_always_the_last
};
#endif

/**
   Query type constants (usable as bitmap flags).
*/
enum enum_query_type
{
  /// Nothing specific, ordinary SQL query.
  QT_ORDINARY= 0,
  /// In utf8.
  QT_TO_SYSTEM_CHARSET= (1 << 0),
  /// Without character set introducers.
  QT_WITHOUT_INTRODUCERS= (1 << 1),
  /// view internal representation (like QT_ORDINARY except ORDER BY clause)
  QT_VIEW_INTERNAL= (1 << 2)
};

/* query_id */
typedef int64 query_id_t;
extern query_id_t global_query_id;
extern my_atomic_rwlock_t global_query_id_lock;
extern my_atomic_rwlock_t statistics_lock;

void unireg_end(void) __attribute__((noreturn));

/* increment query_id and return it.  */
inline query_id_t next_query_id()
{
  query_id_t id;
  my_atomic_rwlock_wrlock(&global_query_id_lock);
  id= my_atomic_add64(&global_query_id, 1);
  my_atomic_rwlock_wrunlock(&global_query_id_lock);
  return (id);
}

inline query_id_t get_query_id()
{
  query_id_t id;
  my_atomic_rwlock_wrlock(&global_query_id_lock);
  id= my_atomic_load64(&global_query_id);
  my_atomic_rwlock_wrunlock(&global_query_id_lock);
  return id;
}


/*
  TODO: Replace this with an inline function.
 */
#ifndef EMBEDDED_LIBRARY
extern "C" void unireg_abort(int exit_code) __attribute__((noreturn));
#else
extern "C" void unireg_clear(int exit_code);
#define unireg_abort(exit_code) do { unireg_clear(exit_code); DBUG_RETURN(exit_code); } while(0)
#endif

inline void table_case_convert(char * name, uint length)
{
  if (lower_case_table_names)
    files_charset_info->cset->casedn(files_charset_info,
                                     name, length, name, length);
}

inline void thread_safe_increment32(int32 *value, my_atomic_rwlock_t *lock)
{
  my_atomic_rwlock_wrlock(lock);
  (void) my_atomic_add32(value, 1);
  my_atomic_rwlock_wrunlock(lock);
}

inline void thread_safe_decrement32(int32 *value, my_atomic_rwlock_t *lock)
{
  my_atomic_rwlock_wrlock(lock);
  (void) my_atomic_add32(value, -1);
  my_atomic_rwlock_wrunlock(lock);
}

inline void thread_safe_increment64(int64 *value, my_atomic_rwlock_t *lock)
{
  my_atomic_rwlock_wrlock(lock);
  (void) my_atomic_add64(value, 1);
  my_atomic_rwlock_wrunlock(lock);
}

inline void thread_safe_decrement64(int64 *value, my_atomic_rwlock_t *lock)
{
  my_atomic_rwlock_wrlock(lock);
  (void) my_atomic_add64(value, -1);
  my_atomic_rwlock_wrunlock(lock);
}

inline void
inc_thread_running()
{
  thread_safe_increment32(&thread_running, &thread_running_lock);
}

inline void
dec_thread_running()
{
  thread_safe_decrement32(&thread_running, &thread_running_lock);
}

void set_server_version(void);

#if defined(MYSQL_DYNAMIC_PLUGIN) && defined(_WIN32)
extern "C" THD *_current_thd_noinline();
#define _current_thd() _current_thd_noinline()
#else
/*
  THR_THD is a key which will be used to set/get THD* for a thread,
  using my_pthread_setspecific_ptr()/my_thread_getspecific_ptr().
*/
extern pthread_key(THD*, THR_THD);
inline THD *_current_thd(void)
{
  return my_pthread_getspecific_ptr(THD*,THR_THD);
}
#endif
#define current_thd _current_thd()
inline int set_current_thd(THD *thd)
{
  return my_pthread_setspecific_ptr(THR_THD, thd);
}

/*
  @todo remove, make it static in ha_maria.cc
  currently it's needed for sql_select.cc
*/
extern handlerton *maria_hton;

extern uint extra_connection_count;
extern uint64 global_gtid_counter;
extern my_bool opt_gtid_strict_mode;
extern my_bool opt_userstat_running, debug_assert_if_crashed_table;
extern uint mysqld_extra_port;
extern ulong opt_progress_report_time;
extern ulong extra_max_connections;
extern ulonglong denied_connections;
extern ulong thread_created;
extern scheduler_functions *thread_scheduler, *extra_thread_scheduler;
extern char *opt_log_basename;
extern my_bool opt_master_verify_checksum;
extern my_bool opt_stack_trace;
extern my_bool opt_expect_abort;
extern my_bool opt_slave_sql_verify_checksum;
extern ulong binlog_checksum_options;
extern bool max_user_connections_checking;
extern ulong opt_binlog_dbug_fsync_sleep;

extern uint internal_tmp_table_max_key_length;
extern uint internal_tmp_table_max_key_segments;

extern uint volatile global_disable_checkpoint;
extern my_bool opt_help;

#endif /* MYSQLD_INCLUDED */