Fix: handle sys_futex() FUTEX_WAIT interrupted by signal
[urcu.git] / urcu / ref.h
CommitLineData
453629a9
MD
1#ifndef _URCU_REF_H
2#define _URCU_REF_H
3
4/*
5 * Userspace RCU - Reference counting
6 *
7 * Copyright (C) 2009 Novell Inc.
8 * Copyright (C) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 *
10 * Author: Jan Blunck <jblunck@suse.de>
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU Lesser General Public License version 2.1 as
14 * published by the Free Software Foundation.
15 */
16
17#include <assert.h>
a2e7bf9c 18#include <urcu/uatomic.h>
453629a9
MD
19
20struct urcu_ref {
21 long refcount; /* ATOMIC */
22};
23
24static inline void urcu_ref_set(struct urcu_ref *ref, long val)
25{
26 uatomic_set(&ref->refcount, val);
27}
28
29static inline void urcu_ref_init(struct urcu_ref *ref)
30{
31 urcu_ref_set(ref, 1);
32}
33
34static inline void urcu_ref_get(struct urcu_ref *ref)
35{
bf27322d 36 uatomic_add(&ref->refcount, 1);
453629a9
MD
37}
38
39static inline void urcu_ref_put(struct urcu_ref *ref,
40 void (*release)(struct urcu_ref *))
41{
bf27322d
PB
42 long res = uatomic_sub_return(&ref->refcount, 1);
43 assert (res >= 0);
44 if (res == 0)
453629a9
MD
45 release(ref);
46}
47
48#endif /* _URCU_REF_H */
This page took 0.041901 seconds and 4 git commands to generate.