Function refresh_status

phx_percona/percona/sql/mysqld.cc:9890–9917

Clear most status variables. */

/** Clear most status variables. */
void refresh_status(THD *thd)
{
  mysql_mutex_lock(&LOCK_status);

  /* Add thread's status variabes to global status */
  add_to_status(&global_status_var, &thd->status_var);

  /* Reset thread's status variables */
  memset(&thd->status_var, 0, sizeof(thd->status_var));

  /* Reset some global variables */
  reset_status_vars();

  /* Reset the counters of all key caches (default and named). */
  process_key_caches(reset_key_cache_counters);
  flush_status_time= time((time_t*) 0);
  mysql_mutex_unlock(&LOCK_status);

  /*
    Set max_used_connections to the number of currently open
    connections.  Lock LOCK_thread_count out of LOCK_status to avoid
    deadlocks.  Status reset becomes not atomic, but status data is
    not exact anyway.
  */
  mysql_mutex_lock(&LOCK_thread_count);
  max_used_connections= get_thread_count() - delayed_insert_threads;
  mysql_mutex_unlock(&LOCK_thread_count);
}


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