[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
 *
 */


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)
{
	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
	14	typedef void (lttng_release_func)(void );
	15
	16	struct lttng_ref {
	17	unsigned long count;
	18	lttng_release_func release;
	19	};
	20
	21	static inline
	22	void lttng_ref_init(struct lttng_ref *ref, lttng_release_func release)
	23	{
	24	LTTNG_ASSERT(ref);
	25	ref->count = 1;
	26	ref->release = release;
	27	}
	28
	29	static inline
	30	void lttng_ref_get(struct lttng_ref *ref)
	31	{
	32	LTTNG_ASSERT(ref);
	33	ref->count++;
	34	/* Overflow check. */
	35	LTTNG_ASSERT(ref->count);
	36	}
	37
	38	static inline
	39	void lttng_ref_put(struct lttng_ref *ref)
	40	{
	41	LTTNG_ASSERT(ref);
	42	/* Underflow check. */
	43	LTTNG_ASSERT(ref->count);
	44	if (caa_unlikely((--ref->count) == 0)) {
	45	ref->release(ref);
	46	}
	47	}
	48
	49	#endif /* LTTNG_REF_INTERNAL_H */