locking_service.h

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/* Copyright (c) 2015, 2023, Oracle and/or its affiliates.
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.
 
   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.
 
   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, version 2.0, 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 LOCKING_SERVICE_INCLUDED
#define LOCKING_SERVICE_INCLUDED
 
#include <stddef.h>
 
#include "my_systime.h"             // Timout_type
#include "mysql/service_locking.h"  // enum_locking_service_lock_type
class THD;
 
/**
  Acquire locking service locks.
 
  @param opaque_thd      Thread handle. If NULL, current_thd will be used.
  @param lock_namespace  Namespace of the locks to acquire.
  @param lock_names      Array of names of the locks to acquire.
  @param lock_num        Number of elements in 'lock_names'.
  @param lock_type       Lock type to acquire. LOCKING_SERVICE_READ or _WRITE.
  @param lock_timeout    Number of seconds to wait before giving up.
 
  @retval 1              Acquisition failed, error has been reported.
  @retval 0              Acquisition successful, all locks acquired.
 
  @note both lock_namespace and lock_names are limited to 64 characters max.
  Names are compared using binary comparison.
*/
int acquire_locking_service_locks(MYSQL_THD opaque_thd,
                                  const char *lock_namespace,
                                  const char **lock_names, size_t lock_num,
                                  enum enum_locking_service_lock_type lock_type,
                                  Timeout_type lock_timeout);
 
/**
  Release all lock service locks taken by the given connection
  in the given namespace.
 
  @param opaque_thd      Thread handle. If NULL, current_thd will be used.
  @param lock_namespace  Namespace of the locks to release.
 
  @retval 1              Release failed, error has been reported.
  @retval 0              Release successful, all locks acquired.
*/
int release_locking_service_locks(MYSQL_THD opaque_thd,
                                  const char *lock_namespace);
 
/**
  Release all locking service locks taken by the given connection
  in all namespaces.
 
  @param thd             Thread handle.
*/
void release_all_locking_service_locks(THD *thd);
 
#endif /* LOCKING_SERVICE_INCLUDED */