[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>
 *
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 */

#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
8abe313a JG	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	*
ab5be9fa	9	* SPDX-License-Identifier: LGPL-2.1-only
8abe313a	10	*
8abe313a JG	11	*/
	12
	13	#include <assert.h>
	14
	15	typedef void (lttng_release_func)(void );
	16
	17	struct lttng_ref {
	18	unsigned long count;
	19	lttng_release_func release;
	20	};
	21
	22	static inline
	23	void lttng_ref_init(struct lttng_ref *ref, lttng_release_func release)
	24	{
	25	assert(ref);
	26	ref->count = 1;
	27	ref->release = release;
	28	}
	29
	30	static inline
	31	void lttng_ref_get(struct lttng_ref *ref)
	32	{
	33	assert(ref);
	34	ref->count++;
	35	/* Overflow check. */
	36	assert(ref->count);
	37	}
	38
	39	static inline
	40	void lttng_ref_put(struct lttng_ref *ref)
	41	{
	42	assert(ref);
	43	/* Underflow check. */
	44	assert(ref->count);
	45	if (caa_unlikely((--ref->count) == 0)) {
	46	ref->release(ref);
	47	}
	48	}
	49
	50	#endif /* LTTNG_REF_INTERNAL_H */