Merge gbichot@bk-internal.mysql.com:/home/bk/mysql-4.0

  void close_active_vio();

#endif  

  void awake(bool prepare_to_die);

  /*

    For enter_cond() / exit_cond() to work the mutex must be got before

    enter_cond() but released before exit_cond() (in 4.1, assertions will soon

    ensure this). Use must be:

    lock mutex; enter_cond(); ...; unlock mutex; exit_cond().

    If you don't do it this way, you will get a deadlock if another thread is

    doing a THD::awake() on you.

  */

  inline const char* enter_cond(pthread_cond_t *cond, pthread_mutex_t* mutex,

			  const char* msg)

  {

    const char* old_msg = proc_info;

    safe_mutex_assert_owner(mutex);

    mysys_var->current_mutex = mutex;

    mysys_var->current_cond = cond;

    proc_info = msg;