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//proc/self/root/usr/include/mysql/server/mysql/psi/psi_base.h

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.

Without limiting anything contained in the foregoing, this file,
  which is part of C Driver for MySQL (Connector/C), is also subject to the
  Universal FOSS Exception, version 1.0, a copy of which can be found at
  http://oss.oracle.com/licenses/universal-foss-exception.

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 MYSQL_PSI_BASE_H
#define MYSQL_PSI_BASE_H

#ifdef EMBEDDED_LIBRARY
#define DISABLE_ALL_PSI
#endif /* EMBEDDED_LIBRARY */

#ifdef __cplusplus
extern "C" {
#endif

/**
  @file mysql/psi/psi_base.h
  Performance schema instrumentation interface.

@defgroup Instrumentation_interface Instrumentation Interface
  @ingroup Performance_schema
  @{
*/

#define PSI_INSTRUMENT_ME 0
#define PSI_INSTRUMENT_MEM ((PSI_memory_key)0)

#define PSI_NOT_INSTRUMENTED 0

/**
  Global flag.
  This flag indicate that an instrumentation point is a global variable,
  or a singleton.
*/
#define PSI_FLAG_GLOBAL (1 << 0)

/**
  Mutable flag.
  This flag indicate that an instrumentation point is a general placeholder,
  that can mutate into a more specific instrumentation point.
*/
#define PSI_FLAG_MUTABLE (1 << 1)

#define PSI_FLAG_THREAD (1 << 2)

/**
  Stage progress flag.
  This flag apply to the stage instruments only.
  It indicates the instrumentation provides progress data.
*/
#define PSI_FLAG_STAGE_PROGRESS (1 << 3)

/**
  Shared Exclusive flag.
  Indicates that rwlock support the shared exclusive state.
*/
#define PSI_RWLOCK_FLAG_SX (1 << 4)

/**
  Transferable flag.
  This flag indicate that an instrumented object can
  be created by a thread and destroyed by another thread.
*/
#define PSI_FLAG_TRANSFER (1 << 5)

/**
  Volatility flag.
  This flag indicate that an instrumented object
  has a volatility (life cycle) comparable
  to the volatility of a session.
*/
#define PSI_FLAG_VOLATILITY_SESSION (1 << 6)

/**
  System thread flag.
  Indicates that the instrumented object exists on a system thread.
*/
#define PSI_FLAG_THREAD_SYSTEM (1 << 9)

#ifdef HAVE_PSI_INTERFACE

/**
  @def PSI_VERSION_1
  Performance Schema Interface number for version 1.
  This version is supported.
*/
#define PSI_VERSION_1 1

/**
  @def PSI_VERSION_2
  Performance Schema Interface number for version 2.
  This version is not implemented, it's a placeholder.
*/
#define PSI_VERSION_2 2

/**
  @def PSI_CURRENT_VERSION
  Performance Schema Interface number for the most recent version.
  The most current version is @c PSI_VERSION_1
*/
#define PSI_CURRENT_VERSION 1

/**
  @def USE_PSI_1
  Define USE_PSI_1 to use the interface version 1.
*/

/**
  @def USE_PSI_2
  Define USE_PSI_2 to use the interface version 2.
*/

/**
  @def HAVE_PSI_1
  Define HAVE_PSI_1 if the interface version 1 needs to be compiled in.
*/

/**
  @def HAVE_PSI_2
  Define HAVE_PSI_2 if the interface version 2 needs to be compiled in.
*/

#ifndef USE_PSI_2
#ifndef USE_PSI_1
#define USE_PSI_1
#endif
#endif

#ifdef USE_PSI_1
#define HAVE_PSI_1
#endif

#ifdef USE_PSI_2
#define HAVE_PSI_2
#endif

/*
  Allow to override PSI_XXX_CALL at compile time
  with more efficient implementations, if available.
  If nothing better is available,
  make a dynamic call using the PSI_server function pointer.
*/

#define PSI_DYNAMIC_CALL(M) PSI_server->M

#endif /* HAVE_PSI_INTERFACE */

/** @} */

/**
  Instrumented memory key.
  To instrument memory, a memory key must be obtained using @c register_memory.
  Using a zero key always disable the instrumentation.
*/
typedef unsigned int PSI_memory_key;

#ifdef __cplusplus
}
#endif

#endif /* MYSQL_PSI_BASE_H */