/* BGP-4 Finite State Machine   
   From RFC1771 [A Border Gateway Protocol 4 (BGP-4)]
   Copyright (C) 1998 Kunihiro Ishiguro

This file is part of GNU Zebra.

GNU Zebra 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; either version 2, or (at your option) any
later version.

GNU Zebra 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 GNU Zebra; see the file COPYING.  If not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */

#ifndef _QUAGGA_BGP_FSM_H
#define _QUAGGA_BGP_FSM_H

/* Macro for BGP read, write and timer thread.  */
#define BGP_READ_ON(T,F,V)			\
  do {						\
    if (!T)					\
      {						\
        peer_lock (peer);			\
        THREAD_READ_ON(master,T,F,peer,V);	\
      }						\
  } while (0)

#define BGP_READ_OFF(T)				\
  do {						\
    if (T)					\
      {						\
        peer_unlock (peer);			\
        THREAD_READ_OFF(T);			\
      }						\
  } while (0)

#define BGP_WRITE_ON(T,F,V)			\
  do {						\
    if (!(T) && (peer->status != Deleted))	\
      {						\
        peer_lock (peer);			\
        THREAD_WRITE_ON(master,(T),(F),peer,(V)); \
      }						\
  } while (0)
    
#define BGP_WRITE_OFF(T)			\
  do {						\
    if (T)					\
      {						\
        peer_unlock (peer);			\
        THREAD_WRITE_OFF(T);			\
      }						\
  } while (0)

#define BGP_TIMER_ON(T,F,V)			\
  do {						\
    if (!(T) && (peer->status != Deleted))	\
      {						\
        peer_lock (peer);			\
        THREAD_TIMER_ON(master,(T),(F),peer,(V)); \
      }						\
  } while (0)

#define BGP_TIMER_OFF(T)			\
  do {						\
    if (T)					\
      { 					\
        peer_unlock (peer);			\
        THREAD_TIMER_OFF(T);			\
      }						\
  } while (0)

#define BGP_EVENT_ADD(P,E)			\
  do {						\
    if ((P)->status != Deleted)			\
      {						\
        peer_lock (peer); /* bgp event reference */ \
        thread_add_event (master, bgp_event, (P), (E)); \
      }						\
  } while (0)

#define BGP_EVENT_DELETE(P)			\
  do { 						\
    peer_unlock (peer); /* bgp event peer reference */ \
    assert (peer); 				\
    thread_cancel_event (master, (P)); 		\
  } while (0)

#define BGP_EVENT_FLUSH_ADD(P,E)	\
  do {					\
    BGP_EVENT_DELETE(P);		\
    BGP_EVENT_ADD(P,E);			\
  } while (0)

/* Prototypes. */
extern int bgp_event (struct thread *);
extern int bgp_stop (struct peer *peer);
extern void bgp_timer_set (struct peer *);
extern void bgp_fsm_change_status (struct peer *peer, int status);
extern const char *peer_down_str[];

#endif /* _QUAGGA_BGP_FSM_H */