text: /* Copyright (c) 2008, 2021, 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 PFS_H
  #define PFS_H
  
  /**
    @file storage/perfschema/pfs.h
    Performance schema instrumentation (declarations).
  */
  
  #define HAVE_PSI_1
  
  #include <my_global.h>
  #include "my_thread.h"
  #include <mysql/psi/psi.h>
  
  /**
    Entry point to the performance schema implementation.
    This singleton is used to discover the performance schema services.
  */
  extern struct PSI_bootstrap PFS_bootstrap;
  /** Performance schema Thread Local Storage key.  */
  extern pthread_key_t THR_PFS;
  extern pthread_key_t THR_PFS_VG;  // global_variables
  extern pthread_key_t THR_PFS_SV;  // session_variables
  extern pthread_key_t THR_PFS_VBT; // variables_by_thread
  extern pthread_key_t THR_PFS_SG;  // global_status
  extern pthread_key_t THR_PFS_SS;  // session_status
  extern pthread_key_t THR_PFS_SBT; // status_by_thread
  extern pthread_key_t THR_PFS_SBU; // status_by_user
  extern pthread_key_t THR_PFS_SBA; // status_by_host
  extern pthread_key_t THR_PFS_SBH; // status_by_account
  
  /** True when @c THR_PFS and all other Performance Schema TLS keys are initialized. */
  extern bool THR_PFS_initialized;
  
  #define PSI_VOLATILITY_UNKNOWN 0
  #define PSI_VOLATILITY_SESSION 1
  
  #define PSI_COUNT_VOLATILITY 2
  
  #endif
  
  