cursor_by_thread_connect_attr.cc

/* Copyright (c) 2008, 2011, 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 as published by
  the Free Software Foundation; version 2 of the License.

  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 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, Suite 500, Boston, MA 02110-1335 USA */

#include "my_global.h"
#include "cursor_by_thread_connect_attr.h"

cursor_by_thread_connect_attr::cursor_by_thread_connect_attr(
  const PFS_engine_table_share *share) :
  PFS_engine_table(share, &m_pos), m_row_exists(false)
{}

int cursor_by_thread_connect_attr::rnd_next(void)
{
  PFS_thread *thread;

  for (m_pos.set_at(&m_next_pos);
       m_pos.has_more_thread();
       m_pos.next_thread())
  {
    thread= &thread_array[m_pos.m_index_1];

    if (thread->m_lock.is_populated())
    {
      make_row(thread, m_pos.m_index_2);
      if (m_row_exists)
      {
        m_next_pos.set_after(&m_pos);
        return 0;
      }
    }
  }
  return HA_ERR_END_OF_FILE;
}


int cursor_by_thread_connect_attr::rnd_pos(const void *pos)
{
  PFS_thread *thread;

  set_position(pos);
  DBUG_ASSERT(m_pos.m_index_1 < thread_max);

  thread= &thread_array[m_pos.m_index_1];
  if (!thread->m_lock.is_populated())
    return HA_ERR_RECORD_DELETED;

  make_row(thread, m_pos.m_index_2);
  if (m_row_exists)
    return 0;

  return HA_ERR_RECORD_DELETED;
}


void cursor_by_thread_connect_attr::reset_position(void)
{
  m_pos.reset();
  m_next_pos.reset();
}