Function thd_wait_begin

sql/sql_class.cc:6138–6147

  thd_wait_end MUST be called immediately after waking up again.
*/
extern "C" void thd_wait_begin(MYSQL_THD thd, int wait_type)
{
  if (!thd)
  {
    thd= current_thd;
    if (unlikely(!thd))
      return;
  }
  MYSQL_CALLBACK(thd->scheduler, thd_wait_begin, (thd, wait_type));
}

/**
  Interface for MySQL Server, plugins and storage engines to report