Fix: handle sys_futex() FUTEX_WAIT interrupted by signal
[urcu.git] / urcu / ref.h
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>
18 #include <urcu/uatomic.h>
19
20 struct urcu_ref {
21 long refcount; /* ATOMIC */
22 };
23
24 static inline void urcu_ref_set(struct urcu_ref *ref, long val)
25 {
26 uatomic_set(&ref->refcount, val);
27 }
28
29 static inline void urcu_ref_init(struct urcu_ref *ref)
30 {
31 urcu_ref_set(ref, 1);
32 }
33
34 static inline void urcu_ref_get(struct urcu_ref *ref)
35 {
36 uatomic_add(&ref->refcount, 1);
37 }
38
39 static inline void urcu_ref_put(struct urcu_ref *ref,
40 void (*release)(struct urcu_ref *))
41 {
42 long res = uatomic_sub_return(&ref->refcount, 1);
43 assert (res >= 0);
44 if (res == 0)
45 release(ref);
46 }
47
48 #endif /* _URCU_REF_H */
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