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

#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
 *
 */

using lttng_release_func = void (*)(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)
{
	LTTNG_ASSERT(ref);
	ref->count = 1;
	ref->release = release;
}

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

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