#ifndef _URCU_FUTEX_H
#define _URCU_FUTEX_H

/*
 * urcu-futex.h
 *
 * Userspace RCU - sys_futex/compat_futex header.
 *
 * Copyright 2011-2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * This 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.
 *
 * This 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <urcu/config.h>
#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif 

#define FUTEX_WAIT		0
#define FUTEX_WAKE		1

/*
 * sys_futex compatibility header.
 * Use *only* *either of* futex_noasync OR futex_async on a given address.
 *
 * futex_noasync cannot be executed in signal handlers, but ensures that
 * it will be put in a wait queue even in compatibility mode.
 *
 * futex_async is signal-handler safe for the wakeup. It uses polling
 * on the wait-side in compatibility mode.
 */

#ifdef CONFIG_RCU_HAVE_FUTEX
#include <sys/syscall.h>
#define futex(...)	syscall(__NR_futex, __VA_ARGS__)
#define futex_noasync(uaddr, op, val, timeout, uaddr2, val3)	\
		futex(uaddr, op, val, timeout, uaddr2, val3)
#define futex_async(uaddr, op, val, timeout, uaddr2, val3)	\
		futex(uaddr, op, val, timeout, uaddr2, val3)
#else
extern int compat_futex_noasync(int32_t *uaddr, int op, int32_t val,
	const struct timespec *timeout, int32_t *uaddr2, int32_t val3);
#define futex_noasync(uaddr, op, val, timeout, uaddr2, val3)	\
		compat_futex_noasync(uaddr, op, val, timeout, uaddr2, val3)
extern int compat_futex_async(int32_t *uaddr, int op, int32_t val,
	const struct timespec *timeout, int32_t *uaddr2, int32_t val3);
#define futex_async(uaddr, op, val, timeout, uaddr2, val3)	\
		compat_futex_async(uaddr, op, val, timeout, uaddr2, val3)
#endif

#ifdef __cplusplus 
}
#endif

#endif /* _URCU_FUTEX_H */