mariadb/storage/perfschema/table_sync_instances.h

/* Copyright (c) 2008, 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,
  51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */

#ifndef TABLE_SYNC_INSTANCE_H
#define TABLE_SYNC_INSTANCE_H

/**
  @file storage/perfschema/table_sync_instances.h
  Table MUTEX_INSTANCES, RWLOCK_INSTANCES and COND_INSTANCES (declarations).
*/

#include "pfs_column_types.h"
#include "pfs_engine_table.h"

struct PFS_mutex;
struct PFS_rwlock;
struct PFS_cond;

/**
  @addtogroup Performance_schema_tables
  @{
*/

/** A row of table PERFORMANCE_SCHEMA.MUTEX_INSTANCES. */
struct row_mutex_instances
{
  /** Column NAME. */
  const char *m_name;
  /** Length in bytes of @c m_name. */
  uint m_name_length;
  /** Column OBJECT_INSTANCE_BEGIN. */
  const void *m_identity;
  /** True if column LOCKED_BY_THREAD_ID is not null. */
  bool m_locked;
  /** Column LOCKED_BY_THREAD_ID. */
  ulonglong m_locked_by_thread_id;
};

/** Table PERFORMANCE_SCHEMA.MUTEX_INSTANCES. */
class table_mutex_instances : public PFS_engine_table
{
public:
  static PFS_engine_table_share_state m_share_state;
  /** Table share. */
  static PFS_engine_table_share m_share;
  static PFS_engine_table* create();
  static ha_rows get_row_count();

  int rnd_next() override;
  int rnd_pos(const void *pos) override;
  void reset_position(void) override;

private:
  int read_row_values(TABLE *table,
                      unsigned char *buf,
                      Field **fields,
                      bool read_all) override;

  table_mutex_instances();

public:
  ~table_mutex_instances() = default;

private:
  void make_row(PFS_mutex *pfs);

  /** Table share lock. */
  static THR_LOCK m_table_lock;

  /** Current row. */
  row_mutex_instances m_row;
  /** True if the current row exists. */
  bool m_row_exists;
  /** Current position. */
  PFS_simple_index m_pos;
  /** Next position. */
  PFS_simple_index m_next_pos;
};

/** A row of table PERFORMANCE_SCHEMA.RWLOCK_INSTANCES. */
struct row_rwlock_instances
{
  /** Column NAME. */
  const char *m_name;
  /** Length in bytes of @c m_name. */
  uint m_name_length;
  /** Column OBJECT_INSTANCE_BEGIN. */
  const void *m_identity;
  /** True if column WRITE_LOCKED_BY_THREAD_ID is not null. */
  bool m_write_locked;
  /** Column WRITE_LOCKED_BY_THREAD_ID. */
  ulonglong m_write_locked_by_thread_id;
  /** Column READ_LOCKED_BY_COUNT. */
  ulong m_readers;
};

/** Table PERFORMANCE_SCHEMA.RWLOCK_INSTANCES. */
class table_rwlock_instances : public PFS_engine_table
{
public:
  static PFS_engine_table_share_state m_share_state;
  /** Table share */
  static PFS_engine_table_share m_share;
  static PFS_engine_table* create();
  static ha_rows get_row_count();

  int rnd_next() override;
  int rnd_pos(const void *pos) override;
  void reset_position(void) override;

private:
  int read_row_values(TABLE *table,
                      unsigned char *buf,
                      Field **fields,
                      bool read_all) override;

  table_rwlock_instances();

public:
  ~table_rwlock_instances() = default;

private:
  void make_row(PFS_rwlock *pfs);

  /** Table share lock. */
  static THR_LOCK m_table_lock;

  /** Current row. */
  row_rwlock_instances m_row;
  /** True if the current row exists. */
  bool m_row_exists;
  /** Current position. */
  PFS_simple_index m_pos;
  /** Next position. */
  PFS_simple_index m_next_pos;
};

/** A row of table PERFORMANCE_SCHEMA.COND_INSTANCES. */
struct row_cond_instances
{
  /** Column NAME. */
  const char *m_name;
  /** Length in bytes of @c m_name. */
  uint m_name_length;
  /** Column OBJECT_INSTANCE_BEGIN. */
  const void *m_identity;
};

/** Table PERFORMANCE_SCHEMA.COND_INSTANCES. */
class table_cond_instances : public PFS_engine_table
{
public:
  static PFS_engine_table_share_state m_share_state;
  /** Table share. */
  static PFS_engine_table_share m_share;
  static PFS_engine_table* create();
  static ha_rows get_row_count();

  int rnd_next() override;
  int rnd_pos(const void *pos) override;
  void reset_position(void) override;

private:
  int read_row_values(TABLE *table,
                      unsigned char *buf,
                      Field **fields,
                      bool read_all) override;

  table_cond_instances();

public:
  ~table_cond_instances() = default;

private:
  void make_row(PFS_cond *pfs);

  /** Table share lock. */
  static THR_LOCK m_table_lock;

  /** Current row. */
  row_cond_instances m_row;
  /** True if the current row exists. */
  bool m_row_exists;
  /** Current position. */
  PFS_simple_index m_pos;
  /** Next position. */
  PFS_simple_index m_next_pos;
};

/** @} */
#endif