[thirdparty/systemd.git] / src / basic / refcnt.h

/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once

/* A type-safe atomic refcounter.
 *
 * DO NOT USE THIS UNLESS YOU ACTUALLY CARE ABOUT THREAD SAFETY! */

typedef struct {
        volatile unsigned _value;
} RefCount;

#define REFCNT_GET(r) ((r)._value)
#define REFCNT_INC(r) (__sync_add_and_fetch(&(r)._value, 1))
#define REFCNT_DEC(r) (__sync_sub_and_fetch(&(r)._value, 1))

#define REFCNT_INIT ((RefCount) { ._value = 1 })
Commit	Line	Data
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
e4ee6e5c LP	2	#pragma once
e4ee6e5c LP	3
57de20dd LP	4	/* A type-safe atomic refcounter.
	5	*
	6	* DO NOT USE THIS UNLESS YOU ACTUALLY CARE ABOUT THREAD SAFETY! */
e4ee6e5c LP	7
	8	typedef struct {
	9	volatile unsigned _value;
	10	} RefCount;
	11
	12	#define REFCNT_GET(r) ((r)._value)
	13	#define REFCNT_INC(r) (__sync_add_and_fetch(&(r)._value, 1))
	14	#define REFCNT_DEC(r) (__sync_sub_and_fetch(&(r)._value, 1))
	15
	16	#define REFCNT_INIT ((RefCount) { ._value = 1 })