psi_stage_bits.h

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/* Copyright (c) 2008, 2023, Oracle and/or its affiliates.
 
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  it under the terms of the GNU General Public License, version 2.0,
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  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 COMPONENTS_SERVICES_BITS_PSI_STAGE_BITS_H
#define COMPONENTS_SERVICES_BITS_PSI_STAGE_BITS_H
 
#include <mysql/components/services/bits/psi_bits.h>
 
/**
  @file mponents/services/bits/psi_stage_bits.h
  Performance schema instrumentation interface.
 
  @defgroup psi_abi_stage Stage Instrumentation (ABI)
  @ingroup psi_abi
  @{
*/
 
/**
  Instrumented stage key.
  To instrument a stage, a stage key must be obtained using @c register_stage.
  Using a zero key always disable the instrumentation.
*/
typedef unsigned int PSI_stage_key;
 
/**
  @def PSI_STAGE_VERSION_1
  Performance Schema Stage Interface number for version 1.
  This version is supported.
*/
#define PSI_STAGE_VERSION_1 1
 
/**
  @def PSI_CURRENT_STAGE_VERSION
  Performance Schema Stage Interface number for the most recent version.
  The most current version is @c PSI_STAGE_VERSION_1
*/
#define PSI_CURRENT_STAGE_VERSION 1
 
/**
  Interface for an instrumented stage progress.
  This is a public structure, for efficiency.
*/
struct PSI_stage_progress_v1 {
  unsigned long long m_work_completed;
  unsigned long long m_work_estimated;
};
typedef struct PSI_stage_progress_v1 PSI_stage_progress_v1;
 
/**
  Stage instrument information.
  @since PSI_STAGE_VERSION_1
  This structure is used to register an instrumented stage.
*/
struct PSI_stage_info_v1 {
  /** The registered stage key. */
  PSI_stage_key m_key{0};
  /** The name of the stage instrument to register. */
  const char *m_name{nullptr};
  /**
    The flags of the stage instrument to register.
    @sa PSI_FLAG_PROGRESS
  */
  unsigned int m_flags{0};
  /** Documentation. */
  const char *m_documentation{nullptr};
};
typedef struct PSI_stage_info_v1 PSI_stage_info_v1;
 
/**
  Stage registration API.
  @param category a category name
  @param info an array of stage info to register
  @param count the size of the info array
*/
typedef void (*register_stage_v1_t)(const char *category,
                                    struct PSI_stage_info_v1 **info, int count);
 
/**
  Start a new stage, and implicitly end the previous stage.
  @param key the key of the new stage
  @param src_file the source file name
  @param src_line the source line number
  @return the new stage progress
*/
typedef PSI_stage_progress_v1 *(*start_stage_v1_t)(PSI_stage_key key,
                                                   const char *src_file,
                                                   int src_line);
 
/**
  Get the current stage progress.
  @return the stage progress
*/
typedef PSI_stage_progress_v1 *(*get_current_stage_progress_v1_t)(void);
 
/** End the current stage. */
typedef void (*end_stage_v1_t)(void);
 
typedef struct PSI_stage_info_v1 PSI_stage_info;
typedef struct PSI_stage_progress_v1 PSI_stage_progress;
 
/** @} (end of group psi_abi_stage) */
 
#endif /* COMPONENTS_SERVICES_BITS_PSI_STAGE_BITS_H */