freebsd-dev/sys/compat/linuxkpi/common/include/linux/rcupdate.h

/*-
 * Copyright (c) 2016 Mellanox Technologies, Ltd.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice unmodified, this list of conditions, and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD$
 */
#ifndef	_LINUX_RCUPDATE_H_
#define	_LINUX_RCUPDATE_H_

#include <sys/param.h>
#include <sys/lock.h>
#include <sys/sx.h>

extern struct sx linux_global_rcu_lock;

struct rcu_head {
};

typedef void (*rcu_callback_t)(struct rcu_head *);

static inline void
call_rcu(struct rcu_head *ptr, rcu_callback_t func)
{
	sx_xlock(&linux_global_rcu_lock);
	func(ptr);
	sx_xunlock(&linux_global_rcu_lock);
}

static inline void
rcu_read_lock(void)
{
	sx_slock(&linux_global_rcu_lock);
}

static inline void
rcu_read_unlock(void)
{
	sx_sunlock(&linux_global_rcu_lock);
}

static inline void
rcu_barrier(void)
{
	sx_xlock(&linux_global_rcu_lock);
	sx_xunlock(&linux_global_rcu_lock);
}

static inline void
synchronize_rcu(void)
{
	sx_xlock(&linux_global_rcu_lock);
	sx_xunlock(&linux_global_rcu_lock);
}

#define	hlist_add_head_rcu(n, h)		\
do {						\
  	sx_xlock(&linux_global_rcu_lock);	\
	hlist_add_head(n, h);			\
	sx_xunlock(&linux_global_rcu_lock);	\
} while (0)

#define	hlist_del_init_rcu(n)			\
do {						\
    	sx_xlock(&linux_global_rcu_lock);	\
	hlist_del_init(n);			\
	sx_xunlock(&linux_global_rcu_lock);	\
} while (0)

#define	hlist_del_rcu(n)			\
do {						\
    	sx_xlock(&linux_global_rcu_lock);	\
	hlist_del(n);				\
	sx_xunlock(&linux_global_rcu_lock);	\
} while (0)

#endif					/* _LINUX_RCUPDATE_H_ */