Method unlock

sql/sql_cache.cc:743–768

*/

void Query_cache::unlock(void)
{
  DBUG_ENTER("Query_cache::unlock");
  mysql_mutex_lock(&structure_guard_mutex);
#ifndef DBUG_OFF
  /* Thd may not be set in resize() at mysqld start */
  THD *thd= current_thd;
  if (thd)
    DBUG_ASSERT(m_cache_lock_thread_id == thd->thread_id);
#endif
  DBUG_ASSERT(m_cache_lock_status == Query_cache::LOCKED ||
              m_cache_lock_status == Query_cache::LOCKED_NO_WAIT);
  m_cache_lock_status= Query_cache::UNLOCKED;
  DBUG_PRINT("Query_cache",("Sending signal"));
  mysql_cond_signal(&COND_cache_status_changed);
  DBUG_ASSERT(m_requests_in_progress > 0);
  m_requests_in_progress--;
  if (m_requests_in_progress == 0 && m_cache_status == DISABLE_REQUEST)
  {
    /* No clients => just free query cache */
    free_cache();
    m_cache_status= DISABLED;
  }
  mysql_mutex_unlock(&structure_guard_mutex);
  DBUG_VOID_RETURN;
}


/**