Add missing rcu_cmpxchg_pointer define
[urcu.git] / urcu.h
1 #ifndef _URCU_H
2 #define _URCU_H
3
4 /*
5 * urcu.h
6 *
7 * Userspace RCU header
8 *
9 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
10 * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
11 *
12 * LGPL-compatible code should include this header with :
13 *
14 * #define _LGPL_SOURCE
15 * #include <urcu.h>
16 *
17 * This library is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU Lesser General Public
19 * License as published by the Free Software Foundation; either
20 * version 2.1 of the License, or (at your option) any later version.
21 *
22 * This library is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 * Lesser General Public License for more details.
26 *
27 * You should have received a copy of the GNU Lesser General Public
28 * License along with this library; if not, write to the Free Software
29 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 *
31 * IBM's contributions to this file may be relicensed under LGPLv2 or later.
32 */
33
34 #include <stdlib.h>
35 #include <pthread.h>
36
37 /*
38 * Important !
39 *
40 * Each thread containing read-side critical sections must be registered
41 * with rcu_register_thread() before calling rcu_read_lock().
42 * rcu_unregister_thread() should be called before the thread exits.
43 */
44
45 #ifdef _LGPL_SOURCE
46
47 #include <urcu-static.h>
48
49 /*
50 * Mappings for static use of the userspace RCU library.
51 * Should only be used in LGPL-compatible code.
52 */
53
54 #define rcu_dereference _rcu_dereference
55 #define rcu_read_lock _rcu_read_lock
56 #define rcu_read_unlock _rcu_read_unlock
57
58 #define rcu_assign_pointer _rcu_assign_pointer
59 #define rcu_cmpxchg_pointer _rcu_cmpxchg_pointer
60 #define rcu_xchg_pointer _rcu_xchg_pointer
61 #define rcu_publish_content _rcu_publish_content
62
63 #else /* !_LGPL_SOURCE */
64
65 /*
66 * library wrappers to be used by non-LGPL compatible source code.
67 */
68
69 extern void rcu_read_lock(void);
70 extern void rcu_read_unlock(void);
71
72 extern void *rcu_dereference(void *p);
73
74 extern void *rcu_assign_pointer_sym(void **p, void *v);
75
76 #define rcu_assign_pointer(p, v) \
77 rcu_assign_pointer_sym((void **)(p), (v))
78
79 extern void *rcu_cmpxchg_pointer_sym(void **p, void *old, void *_new);
80 #define rcu_cmpxchg_pointer(p, old, _new) \
81 rcu_cmpxchg_pointer_sym((void **)(p), (old), (_new))
82
83 extern void *rcu_xchg_pointer_sym(void **p, void *v);
84 #define rcu_xchg_pointer(p, v) \
85 rcu_xchg_pointer_sym((void **)(p), (v))
86
87 extern void *rcu_publish_content_sym(void **p, void *v);
88 #define rcu_publish_content(p, v) \
89 rcu_publish_content_sym((void **)(p), (v))
90
91 #endif /* !_LGPL_SOURCE */
92
93 extern void synchronize_rcu(void);
94
95 /*
96 * Reader thread registration.
97 */
98 extern void rcu_register_thread(void);
99 extern void rcu_unregister_thread(void);
100
101 #endif /* _URCU_H */
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