[lttng-tools.git] / include / lttng / ref-internal.h

#ifndef LTTNG_REF_INTERNAL_H
#define LTTNG_REF_INTERNAL_H

/*
 * LTTng - Non thread-safe reference counting
 *
 * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * Author: Jérémie Galarneau <jeremie.galarneau@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, version 2.1 only,
 * as published by the Free Software Foundation.
 *
 * 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 <assert.h>

typedef void (*lttng_release_func)(void *);

struct lttng_ref {
	unsigned long count;
	lttng_release_func release;
};

static inline
void lttng_ref_init(struct lttng_ref *ref, lttng_release_func release)
{
	assert(ref);
	ref->count = 1;
	ref->release = release;
}

static inline
void lttng_ref_get(struct lttng_ref *ref)
{
	assert(ref);
	ref->count++;
	/* Overflow check. */
	assert(ref->count);
}

static inline
void lttng_ref_put(struct lttng_ref *ref)
{
	assert(ref);
	/* Underflow check. */
	assert(ref->count);
	if (caa_unlikely((--ref->count) == 0)) {
		ref->release(ref);
	}
}

#endif /* LTTNG_REF_INTERNAL_H */
Commit	Line	Data
	1	#ifndef LTTNG_REF_INTERNAL_H
	2	#define LTTNG_REF_INTERNAL_H
	3
	4	/*
	5	* LTTng - Non thread-safe reference counting
	6	*
	7	* Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
	8	*
	9	* Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
	10	*
	11	* This library is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU Lesser General Public License, version 2.1 only,
	13	* as published by the Free Software Foundation.
	14	*
	15	* This library is distributed in the hope that it will be useful, but WITHOUT
	16	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	17	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
	18	* for more details.
	19	*
	20	* You should have received a copy of the GNU Lesser General Public License
	21	* along with this library; if not, write to the Free Software Foundation,
	22	* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	23	*/
	24
	25	#include <assert.h>
	26
	27	typedef void (lttng_release_func)(void );
	28
	29	struct lttng_ref {
	30	unsigned long count;
	31	lttng_release_func release;
	32	};
	33
	34	static inline
	35	void lttng_ref_init(struct lttng_ref *ref, lttng_release_func release)
	36	{
	37	assert(ref);
	38	ref->count = 1;
	39	ref->release = release;
	40	}
	41
	42	static inline
	43	void lttng_ref_get(struct lttng_ref *ref)
	44	{
	45	assert(ref);
	46	ref->count++;
	47	/* Overflow check. */
	48	assert(ref->count);
	49	}
	50
	51	static inline
	52	void lttng_ref_put(struct lttng_ref *ref)
	53	{
	54	assert(ref);
	55	/* Underflow check. */
	56	assert(ref->count);
	57	if (caa_unlikely((--ref->count) == 0)) {
	58	ref->release(ref);
	59	}
	60	}
	61
	62	#endif /* LTTNG_REF_INTERNAL_H */