/*
 * Copyright (c) 1995, 1996 Gunther Schadow.  All rights reserved.
 *
 * This program 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 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef TRIP_H
#define TRIP_H

#include <pg_config.h>
#include <trap.h>

#define SIGCLAIM SIGUSR1
#define SIGYIELD SIGUSR2

#define PRI_HIGH 1
#define PRI_LOW  0

#define CLAIM_SLEEP_TIMER 100000 /* microseconds */

__BEGIN_DECLS
extern result claim_line(pid_t, int pri);
extern void   wait_line();
__END_DECLS

#define yield_line(pid) kill(pid, SIGYIELD)

/*
 * MACROS for the standard case
 */

#define TRIP_DECL bool __init_trip = TRUE
#define TRAP_DECL bool __init_trap = TRUE

#define __INIT_TRIP_TRAP(cp) \
  atsignal(SIGCLAIM, 0) { yield_line(cp); wait_line(); } \
  atsignal(SIGYIELD, 0);

#define TRIP_INIT(cp) __INIT_TRIP_TRAP(cp) \
  if(__init_trip) { __init_trip = FALSE; wait_line(); }

#define TRAP_INIT(cp) __INIT_TRIP_TRAP(cp) \
  if(__init_trap) { __init_trap = FALSE; sleep(1); yield_line(cp); }

#endif