~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 Sun Microsystems

 *

 *  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 DRIZZLED_LOCK_H

#define DRIZZLED_LOCK_H

#include <mysys/definitions.h>

class Session;

class Table;

class TableList;

typedef struct drizzled_lock_st DRIZZLE_LOCK;

DRIZZLE_LOCK *mysql_lock_tables(Session *session, Table **table, uint32_t count,

                                uint32_t flags, bool *need_reopen);

/* mysql_lock_tables() and open_table() flags bits */

#define DRIZZLE_LOCK_IGNORE_GLOBAL_READ_LOCK      0x0001

#define DRIZZLE_LOCK_IGNORE_FLUSH                 0x0002

#define DRIZZLE_LOCK_NOTIFY_IF_NEED_REOPEN        0x0004

#define DRIZZLE_OPEN_TEMPORARY_ONLY               0x0008

#define DRIZZLE_LOCK_PERF_SCHEMA                  0x0020

void mysql_unlock_tables(Session *session, DRIZZLE_LOCK *sql_lock);

void mysql_unlock_read_tables(Session *session, DRIZZLE_LOCK *sql_lock);

void mysql_unlock_some_tables(Session *session, Table **table,uint32_t count);

void mysql_lock_remove(Session *session, DRIZZLE_LOCK *locked,Table *table,

                       bool always_unlock);

void mysql_lock_abort(Session *session, Table *table, bool upgrade_lock);

void mysql_lock_downgrade_write(Session *session, Table *table,

                                thr_lock_type new_lock_type);

bool mysql_lock_abort_for_thread(Session *session, Table *table);

DRIZZLE_LOCK *mysql_lock_merge(DRIZZLE_LOCK *a,DRIZZLE_LOCK *b);

TableList *mysql_lock_have_duplicate(Session *session, TableList *needle,

                                      TableList *haystack);

bool lock_global_read_lock(Session *session);

void unlock_global_read_lock(Session *session);

bool wait_if_global_read_lock(Session *session, bool abort_on_refresh,

                              bool is_not_commit);

void start_waiting_global_read_lock(Session *session);

bool make_global_read_lock_block_commit(Session *session);

bool set_protect_against_global_read_lock(void);

void unset_protect_against_global_read_lock(void);

void broadcast_refresh(void);

int try_transactional_lock(Session *session, TableList *table_list);

int check_transactional_lock(Session *session, TableList *table_list);

int set_handler_table_locks(Session *session, TableList *table_list,

                            bool transactional);

/* Lock based on name */

int lock_and_wait_for_table_name(Session *session, TableList *table_list);

int lock_table_name(Session *session, TableList *table_list, bool check_in_use);

void unlock_table_name(Session *session, TableList *table_list);

bool wait_for_locked_table_names(Session *session, TableList *table_list);

bool lock_table_names(Session *session, TableList *table_list);

void unlock_table_names(Session *session, TableList *table_list,

			TableList *last_table);

bool lock_table_names_exclusively(Session *session, TableList *table_list);

bool is_table_name_exclusively_locked_by_this_thread(Session *session,

                                                     TableList *table_list);

bool is_table_name_exclusively_locked_by_this_thread(Session *session,

                                                     unsigned char *key,

                                                     int key_length);

#endif /* DRIZZLED_LOCK_H */