mariadb/storage/perfschema/table_threads.h

/* Copyright (c) 2008, 2011, 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, 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_THREADS_H
#define TABLE_THREADS_H

#include "pfs_column_types.h"
#include "cursor_by_thread.h"

struct PFS_thread;

/**
  \addtogroup Performance_schema_tables
  @{
*/

/**
  A row of PERFORMANCE_SCHEMA.THREADS.
*/
struct row_threads
{
  /** Column THREAD_ID. */
  ulonglong m_thread_internal_id;
  /** Column PROCESSLIST_ID. */
  ulonglong m_processlist_id;
  /** Column NAME. */
  const char* m_name;
  /** Length in bytes of @c m_name. */
  uint m_name_length;
  /** Column PROCESSLIST_USER. */
  char m_username[USERNAME_LENGTH];
  /** Length in bytes of @c m_username. */
  uint m_username_length;
  /** Column PROCESSLIST_HOST. */
  char m_hostname[HOSTNAME_LENGTH];
  /** Length in bytes of @c m_hostname. */
  uint m_hostname_length;
  /** Column PROCESSLIST_DB. */
  char m_dbname[NAME_LEN];
  /** Length in bytes of @c m_dbname. */
  uint m_dbname_length;
  /** Column PROCESSLIST_COMMAND. */
  int m_command;
  /** Column PROCESSLIST_TIME. */
  time_t m_start_time;
  /** Column PROCESSLIST_STATE. */
  const char* m_processlist_state_ptr;
  /** Length in bytes of @c m_processlist_state_ptr. */
  uint m_processlist_state_length;
  /** Column PROCESSLIST_INFO. */
  const char* m_processlist_info_ptr;
  /** Length in bytes of @c m_processlist_info_ptr. */
  uint m_processlist_info_length;
  /** Column INSTRUMENTED. */
  bool *m_enabled_ptr;
  /** Column PARENT_THREAD_ID. */
  ulonglong m_parent_thread_internal_id;
};

/** Table PERFORMANCE_SCHEMA.THREADS. */
class table_threads : public cursor_by_thread
{
public:
  /** Table share */
  static PFS_engine_table_share m_share;
  /** Table builder */
  static PFS_engine_table* create();

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


  virtual int update_row_values(TABLE *table,
                                const unsigned char *old_buf,
                                const unsigned char *new_buf,
                                Field **fields);

protected:
  table_threads();

public:
  ~table_threads()
  {}

private:
  virtual void make_row(PFS_thread *pfs);

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

  /** Current row. */
  row_threads m_row;
  /** True if the current row exists. */
  bool m_row_exists;
};

/** @} */
#endif