table_setup_threads.h

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/* Copyright (c) 2017, 2025, Oracle and/or its affiliates.
 
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  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.
 
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  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef TABLE_SETUP_THREADS_H
#define TABLE_SETUP_THREADS_H
 
/**
  @file storage/perfschema/table_setup_threads.h
  Table SETUP_THREADS (declarations).
*/
 
#include <sys/types.h>
 
#include "my_base.h"
#include "storage/perfschema/pfs_engine_table.h"
#include "storage/perfschema/table_helper.h"
 
class Field;
class Plugin_table;
struct PFS_instr_class;
struct PFS_thread_class;
struct TABLE;
struct THR_LOCK;
 
/**
  @addtogroup performance_schema_tables
  @{
*/
 
/** A row of PERFORMANCE_SCHEMA.SETUP_THREADS. */
struct row_setup_threads {
  /** Columns NAME, ENABLED, HISTORY, PROPERTIES, VOLATILITY, DOCUMENTATION. */
  PFS_thread_class *m_instr_class;
};
 
class PFS_index_setup_threads : public PFS_engine_index {
 public:
  PFS_index_setup_threads() : PFS_engine_index(&m_key), m_key("NAME") {}
 
  ~PFS_index_setup_threads() override = default;
 
  bool match(PFS_instr_class *klass);
 
 private:
  PFS_key_event_name m_key;
};
 
/** Table PERFORMANCE_SCHEMA.SETUP_INSTRUMENTS. */
class table_setup_threads : public PFS_engine_table {
  typedef PFS_simple_index pos_t;
 
 public:
  /** Table share. */
  static PFS_engine_table_share m_share;
  static PFS_engine_table *create(PFS_engine_table_share *);
  static ha_rows get_row_count();
 
  void reset_position() override;
 
  int rnd_next() override;
  int rnd_pos(const void *pos) override;
 
  int index_init(uint idx, bool sorted) override;
  int index_next() override;
 
 protected:
  int read_row_values(TABLE *table, unsigned char *buf, Field **fields,
                      bool read_all) override;
 
  int update_row_values(TABLE *table, const unsigned char *old_buf,
                        unsigned char *new_buf, Field **fields) override;
 
  table_setup_threads();
 
 public:
  ~table_setup_threads() override = default;
 
 private:
  int make_row(PFS_thread_class *klass);
 
  /** Table share lock. */
  static THR_LOCK m_table_lock;
  /** Table definition. */
  static Plugin_table m_table_def;
 
  /** Current row. */
  row_setup_threads m_row;
  /** Current position. */
  pos_t m_pos;
  /** Next position. */
  pos_t m_next_pos;
 
  PFS_index_setup_threads *m_opened_index;
};
 
/** @} */
#endif