/* Copyright (C) 2008 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by David Bartley <dtbartle@csclub.uwaterloo.ca>, 2008.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _SYNCH_H
#define _SYNCH_H

#include <sys/synch.h>
#include <features.h>

typedef lwp_mutex_t mutex_t;
typedef lwp_cond_t cond_t;
typedef lwp_rwlock_t rwlock_t;
typedef lwp_sema_t sema_t;

#define SEMA_HELD(x)		_sema_held (x)
#define RW_READ_HELD(x)		_rw_read_held (x)
#define RW_WRITE_HELD(x)	_rw_write_held (x)
#define RW_LOCK_HELD(x)		(RW_READ_HELD (x) || RW_WRITE_HELD (x))
#define MUTEX_HELD(x)		_mutex_held (x)

__BEGIN_DECLS

/* syscalls */

int _lwp_mutex_lock (lwp_mutex_t *);
int _lwp_mutex_unlock (lwp_mutex_t *);
int _lwp_mutex_trylock (lwp_mutex_t *);
int _lwp_cond_wait (lwp_cond_t *, lwp_mutex_t *);
int _lwp_cond_timedwait (lwp_cond_t *, lwp_mutex_t *, struct timespec *);
int _lwp_cond_reltimedwait (lwp_cond_t *, lwp_mutex_t *, struct timespec *);
int _lwp_cond_signal (lwp_cond_t *);
int _lwp_cond_broadcast (lwp_cond_t *);
int _lwp_sema_init (lwp_sema_t *, int);
int _lwp_sema_wait (lwp_sema_t *);
int _lwp_sema_trywait (lwp_sema_t *);
int _lwp_sema_post (lwp_sema_t *);

/* condition variables */

int cond_init (cond_t *, int, void *);
int cond_destroy (cond_t *);
int cond_wait (cond_t *, mutex_t *);
int cond_timedwait (cond_t *, mutex_t *, struct timespec *);
int cond_reltimedwait (cond_t *, mutex_t *, struct timespec *);
int cond_signal (cond_t *);
int cond_broadcast (cond_t *);

/* mutexes */

extern int mutex_init (mutex_t *, int, void *);
extern int mutex_destroy (mutex_t *);
extern int mutex_consistent (mutex_t *);
extern int mutex_lock (mutex_t *);
extern int mutex_trylock (mutex_t *);
extern int mutex_unlock (mutex_t *);
extern int _mutex_held (mutex_t *);

/* reader/writer locks */

extern int rwlock_init (rwlock_t *, int, void *);
extern int rwlock_destroy (rwlock_t *);
extern int rw_rdlock (rwlock_t *);
extern int rw_wrlock (rwlock_t *);
extern int rw_unlock (rwlock_t *);
extern int rw_tryrdlock (rwlock_t *);
extern int rw_trywrlock (rwlock_t *);
extern int _rw_read_held (rwlock_t *);
extern int _rw_write_held (rwlock_t *);

/* semaphores */

extern int sema_init (sema_t *, unsigned int, int, void *);
extern int sema_destroy (sema_t *);
extern int sema_wait (sema_t *);
extern int sema_timedwait (sema_t *, struct timespec *);
extern int sema_reltimedwait (sema_t *, const struct timespec *);
extern int sema_post (sema_t *);
extern int sema_trywait (sema_t *);
extern int _sema_held (sema_t *);

__END_DECLS

#endif /* _SYNCH_H */