polardbxengine/storage/perfschema/table_performance_timers.cc

/* Copyright (c) 2008, 2019, Oracle and/or its affiliates. All rights reserved.

  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 not limited to OpenSSL) that is licensed under separate terms,
  as designated in a particular file or component or in included license
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  permission to link the program and your derivative works with the
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  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, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

/**
  @file storage/perfschema/table_performance_timers.cc
  Table PERFORMANCE_TIMERS (implementation).
*/

#include "storage/perfschema/table_performance_timers.h"

#include <stddef.h>

#include "my_dbug.h"
#include "my_thread.h"
#include "sql/field.h"
#include "sql/plugin_table.h"
#include "sql/table.h"
#include "storage/perfschema/pfs_global.h"
#include "storage/perfschema/pfs_timer.h"
#include "storage/perfschema/table_helper.h"

THR_LOCK table_performance_timers::m_table_lock;

Plugin_table table_performance_timers::m_table_def(
    /* Schema name */
    "performance_schema",
    /* Name */
    "performance_timers",
    /* Definition */
    "  TIMER_NAME ENUM ('CYCLE', 'NANOSECOND', 'MICROSECOND', 'MILLISECOND') "
    "NOT "
    "NULL,\n"
    "  TIMER_FREQUENCY BIGINT,\n"
    "  TIMER_RESOLUTION BIGINT,\n"
    "  TIMER_OVERHEAD BIGINT\n",
    /* Options */
    " ENGINE=PERFORMANCE_SCHEMA",
    /* Tablespace */
    nullptr);

PFS_engine_table_share table_performance_timers::m_share = {
    &pfs_readonly_acl,
    table_performance_timers::create,
    NULL, /* write_row */
    NULL, /* delete_all_rows */
    table_performance_timers::get_row_count,
    sizeof(PFS_simple_index), /* ref length */
    &m_table_lock,
    &m_table_def,
    false, /* perpetual */
    PFS_engine_table_proxy(),
    {0},
    false /* m_in_purgatory */
};

PFS_engine_table *table_performance_timers::create(PFS_engine_table_share *) {
  return new table_performance_timers();
}

ha_rows table_performance_timers::get_row_count(void) {
  return COUNT_TIMER_NAME;
}

table_performance_timers::table_performance_timers()
    : PFS_engine_table(&m_share, &m_pos), m_row(NULL), m_pos(0), m_next_pos(0) {
  int index;

  index = (int)TIMER_NAME_CYCLE - FIRST_TIMER_NAME;
  m_data[index].m_timer_name = TIMER_NAME_CYCLE;
  m_data[index].m_info = pfs_timer_info.cycles;

  index = (int)TIMER_NAME_NANOSEC - FIRST_TIMER_NAME;
  m_data[index].m_timer_name = TIMER_NAME_NANOSEC;
  m_data[index].m_info = pfs_timer_info.nanoseconds;

  index = (int)TIMER_NAME_MICROSEC - FIRST_TIMER_NAME;
  m_data[index].m_timer_name = TIMER_NAME_MICROSEC;
  m_data[index].m_info = pfs_timer_info.microseconds;

  index = (int)TIMER_NAME_MILLISEC - FIRST_TIMER_NAME;
  m_data[index].m_timer_name = TIMER_NAME_MILLISEC;
  m_data[index].m_info = pfs_timer_info.milliseconds;
}

void table_performance_timers::reset_position(void) {
  m_pos.m_index = 0;
  m_next_pos.m_index = 0;
}

int table_performance_timers::rnd_next(void) {
  int result;

  m_pos.set_at(&m_next_pos);

  if (m_pos.m_index < COUNT_TIMER_NAME) {
    m_row = &m_data[m_pos.m_index];
    m_next_pos.set_after(&m_pos);
    result = 0;
  } else {
    m_row = NULL;
    result = HA_ERR_END_OF_FILE;
  }

  return result;
}

int table_performance_timers::rnd_pos(const void *pos) {
  set_position(pos);
  DBUG_ASSERT(m_pos.m_index < COUNT_TIMER_NAME);
  m_row = &m_data[m_pos.m_index];
  return 0;
}

int table_performance_timers::read_row_values(TABLE *table, unsigned char *buf,
                                              Field **fields, bool read_all) {
  Field *f;

  DBUG_ASSERT(m_row);

  /* Set the null bits */
  DBUG_ASSERT(table->s->null_bytes == 1);
  buf[0] = 0;

  for (; (f = *fields); fields++) {
    if (read_all || bitmap_is_set(table->read_set, f->field_index)) {
      switch (f->field_index) {
        case 0: /* TIMER_NAME */
          set_field_enum(f, m_row->m_timer_name);
          break;
        case 1: /* TIMER_FREQUENCY */
          if (m_row->m_info.routine != 0) {
            set_field_ulonglong(f, m_row->m_info.frequency);
          } else {
            f->set_null();
          }
          break;
        case 2: /* TIMER_RESOLUTION */
          if (m_row->m_info.routine != 0) {
            set_field_ulonglong(f, m_row->m_info.resolution);
          } else {
            f->set_null();
          }
          break;
        case 3: /* TIMER_OVERHEAD */
          if (m_row->m_info.routine != 0) {
            set_field_ulonglong(f, m_row->m_info.overhead);
          } else {
            f->set_null();
          }
          break;
        default:
          DBUG_ASSERT(false);
      }
    }
  }

  return 0;
}