psi_mdl_bits.h

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/* Copyright (c) 2008, 2025, 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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  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 COMPONENTS_SERVICES_BITS_PSI_MDL_BITS_H
#define COMPONENTS_SERVICES_BITS_PSI_MDL_BITS_H
 
/**
  @file mysql/components/services/bits/psi_mdl_bits.h
  Performance schema instrumentation interface.
 
  @defgroup psi_abi_mdl Metadata Lock Instrumentation (ABI)
  @ingroup psi_abi
  @{
*/
 
struct MDL_key;
 
/** @sa enum_mdl_type. */
typedef int opaque_mdl_type;
 
/** @sa enum_mdl_duration. */
typedef int opaque_mdl_duration;
 
/** @sa MDL_wait::enum_wait_status. */
typedef int opaque_mdl_status;
 
/**
  Interface for an instrumented metadata lock.
  This is an opaque structure.
*/
struct PSI_metadata_lock;
typedef struct PSI_metadata_lock PSI_metadata_lock;
 
/**
  Interface for an instrumented MDL operation.
  This is an opaque structure.
*/
struct PSI_metadata_locker;
typedef struct PSI_metadata_locker PSI_metadata_locker;
 
/**
  State data storage for @c start_metadata_wait_v1_t.
  This structure provide temporary storage to a metadata locker.
  The content of this structure is considered opaque,
  the fields are only hints of what an implementation
  of the psi interface can use.
  This memory is provided by the instrumented code for performance reasons.
  @sa start_metadata_wait_v1_t
*/
struct PSI_metadata_locker_state_v1 {
  /** Internal state. */
  unsigned int m_flags;
  /** Current metadata lock. */
  struct PSI_metadata_lock *m_metadata_lock;
  /** Current thread. */
  struct PSI_thread *m_thread;
  /** Timer start. */
  unsigned long long m_timer_start;
  /** Timer function. */
  unsigned long long (*m_timer)(void);
  /** Internal data. */
  void *m_wait;
};
typedef struct PSI_metadata_locker_state_v1 PSI_metadata_locker_state_v1;
 
typedef PSI_metadata_lock *(*create_metadata_lock_v1_t)(
    void *identity, const struct MDL_key *key, opaque_mdl_type mdl_type,
    opaque_mdl_duration mdl_duration, opaque_mdl_status mdl_status,
    const char *src_file, unsigned int src_line);
 
typedef void (*set_metadata_lock_status_v1_t)(PSI_metadata_lock *lock,
                                              opaque_mdl_status mdl_status);
 
typedef void (*set_metadata_lock_duration_v2_t)(
    PSI_metadata_lock *lock, opaque_mdl_duration mdl_duration);
 
typedef void (*set_metadata_lock_type_v3_t)(PSI_metadata_lock *lock,
                                            opaque_mdl_type mdl_type);
 
typedef void (*destroy_metadata_lock_v1_t)(PSI_metadata_lock *lock);
 
typedef struct PSI_metadata_locker *(*start_metadata_wait_v1_t)(
    struct PSI_metadata_locker_state_v1 *state, struct PSI_metadata_lock *mdl,
    const char *src_file, unsigned int src_line);
 
typedef void (*end_metadata_wait_v1_t)(struct PSI_metadata_locker *locker,
                                       int rc);
 
typedef struct PSI_metadata_locker_state_v1 PSI_metadata_locker_state;
 
/** @} (end of group psi_abi_mdl) */
 
#endif /* COMPONENTS_SERVICES_BITS_PSI_MDL_BITS_H */