[urcu.git] / urcu / ref.h

#ifndef _URCU_REF_H
#define _URCU_REF_H

/*
 * Userspace RCU - Reference counting
 *
 * Copyright (C) 2009 Novell Inc.
 * Copyright (C) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Author: Jan Blunck <jblunck@suse.de>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version 2.1 as
 * published by the Free  Software Foundation.
 */

#include <assert.h>
#include <urcu/uatomic.h>

struct urcu_ref {
	long refcount; /* ATOMIC */
};

static inline void urcu_ref_set(struct urcu_ref *ref, long val)
{
	uatomic_set(&ref->refcount, val);
}

static inline void urcu_ref_init(struct urcu_ref *ref)
{
	urcu_ref_set(ref, 1);
}

static inline void urcu_ref_get(struct urcu_ref *ref)
{
	uatomic_add(&ref->refcount, 1);
}

static inline void urcu_ref_put(struct urcu_ref *ref,
				void (*release)(struct urcu_ref *))
{
	long res = uatomic_sub_return(&ref->refcount, 1);
	assert (res >= 0);
	if (res == 0)
		release(ref);
}

#endif /* _URCU_REF_H */
Commit	Line	Data
	1	#ifndef _URCU_REF_H
	2	#define _URCU_REF_H
	3
	4	/*
	5	* Userspace RCU - Reference counting
	6	*
	7	* Copyright (C) 2009 Novell Inc.
	8	* Copyright (C) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	9	*
	10	* Author: Jan Blunck <jblunck@suse.de>
	11	*
	12	* This program is free software; you can redistribute it and/or modify it
	13	* under the terms of the GNU Lesser General Public License version 2.1 as
	14	* published by the Free Software Foundation.
	15	*/
	16
	17	#include <assert.h>
	18	#include <urcu/uatomic.h>
	19
	20	struct urcu_ref {
	21	long refcount; /* ATOMIC */
	22	};
	23
	24	static inline void urcu_ref_set(struct urcu_ref *ref, long val)
	25	{
	26	uatomic_set(&ref->refcount, val);
	27	}
	28
	29	static inline void urcu_ref_init(struct urcu_ref *ref)
	30	{
	31	urcu_ref_set(ref, 1);
	32	}
	33
	34	static inline void urcu_ref_get(struct urcu_ref *ref)
	35	{
	36	uatomic_add(&ref->refcount, 1);
	37	}
	38
	39	static inline void urcu_ref_put(struct urcu_ref *ref,
	40	void (release)(struct urcu_ref ))
	41	{
	42	long res = uatomic_sub_return(&ref->refcount, 1);
	43	assert (res >= 0);
	44	if (res == 0)
	45	release(ref);
	46	}
	47
	48	#endif /* _URCU_REF_H */