psi_mdl.h

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/* Copyright (c) 2008, 2024, 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.
 
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  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
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  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef MYSQL_PSI_MDL_H
#define MYSQL_PSI_MDL_H
 
/**
  @file include/mysql/psi/psi_mdl.h
  Performance schema instrumentation interface.
 
  @defgroup psi_abi_mdl Metadata Lock Instrumentation (ABI)
  @ingroup psi_abi
  @{
*/
 
#include "my_inttypes.h"
#include "my_macros.h"
 
/* HAVE_PSI_*_INTERFACE */
#include "my_psi_config.h"  // IWYU pragma: keep
 
#include "my_sharedlib.h"
#include "mysql/components/services/bits/psi_mdl_bits.h"
 
/**
  @def PSI_MDL_VERSION_1
  Performance Schema Metadata Lock Interface number for version 1.
  Deprecated in MySQL 8.0.24
*/
#define PSI_MDL_VERSION_1 1
 
/**
  @def PSI_MDL_VERSION_2
  Performance Schema Metadata Lock Interface number for version 2.
  Introduced in MySQL 8.0.24
  This version is supported.
*/
#define PSI_MDL_VERSION_2 2
 
/**
  @def PSI_CURRENT_MDL_VERSION
  Performance Schema Metadata Lock Interface number for the most recent version.
  The most current version is @c PSI_MDL_VERSION_2
*/
#define PSI_CURRENT_MDL_VERSION 2
 
/** Entry point for the performance schema interface. */
struct PSI_mdl_bootstrap {
  /**
    ABI interface finder.
    Calling this method with an interface version number returns either
    an instance of the ABI for this version, or NULL.
    @sa PSI_MDL_VERSION_1
    @sa PSI_MDL_VERSION_2
    @sa PSI_CURRENT_MDL_VERSION
  */
  void *(*get_interface)(int version);
};
typedef struct PSI_mdl_bootstrap PSI_mdl_bootstrap;
 
#ifdef HAVE_PSI_METADATA_INTERFACE
 
/**
  Performance Schema Metadata Lock Interface, version 1.
  @since PSI_MDL_VERSION_1
*/
struct PSI_mdl_service_v1 {
  create_metadata_lock_v1_t create_metadata_lock;
  set_metadata_lock_status_v1_t set_metadata_lock_status;
  destroy_metadata_lock_v1_t destroy_metadata_lock;
  start_metadata_wait_v1_t start_metadata_wait;
  end_metadata_wait_v1_t end_metadata_wait;
};
 
/**
  Performance Schema Metadata Lock Interface, version 2.
  @since PSI_MDL_VERSION_2
*/
struct PSI_mdl_service_v2 {
  create_metadata_lock_v1_t create_metadata_lock;
  set_metadata_lock_status_v1_t set_metadata_lock_status;
  /* Added in version 2. */
  set_metadata_lock_duration_v2_t set_metadata_lock_duration;
  destroy_metadata_lock_v1_t destroy_metadata_lock;
  start_metadata_wait_v1_t start_metadata_wait;
  end_metadata_wait_v1_t end_metadata_wait;
};
 
typedef struct PSI_mdl_service_v2 PSI_mdl_service_t;
 
extern MYSQL_PLUGIN_IMPORT PSI_mdl_service_t *psi_mdl_service;
 
#endif /* HAVE_PSI_METADATA_INTERFACE */
 
/** @} (end of group psi_abi_mdl) */
 
#endif /* MYSQL_PSI_MDL_H */