Add test for rcu_assign_pointer()
[urcu.git] / urcu.h
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1#ifndef _URCU_H
2#define _URCU_H
3
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4/*
5 * urcu.h
6 *
7 * Userspace RCU header
8 *
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9 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
10 * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
5e7e64b9 11 *
121a5d44 12 * LGPL-compatible code should include this header with :
5e7e64b9 13 *
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14 * #define _LGPL_SOURCE
15 * #include <urcu.h>
16 *
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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
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30 *
31 * IBM's contributions to this file may be relicensed under LGPLv2 or later.
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32 */
33
1430ee0b 34#include <stdlib.h>
69a757c9 35#include <pthread.h>
1430ee0b 36
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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
121a5d44 45#ifdef _LGPL_SOURCE
b0d5e790 46
121a5d44 47#include <urcu-static.h>
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48
49/*
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50 * Mappings for static use of the userspace RCU library.
51 * Should only be used in LGPL-compatible code.
3a86deba 52 */
3a86deba 53
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54#define rcu_dereference _rcu_dereference
55#define rcu_read_lock _rcu_read_lock
56#define rcu_read_unlock _rcu_read_unlock
41718ff9 57
121a5d44 58#define rcu_assign_pointer _rcu_assign_pointer
ba59a0c7 59#define rcu_cmpxchg_pointer _rcu_cmpxchg_pointer
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60#define rcu_xchg_pointer _rcu_xchg_pointer
61#define rcu_publish_content _rcu_publish_content
41718ff9 62
121a5d44 63#else /* !_LGPL_SOURCE */
27b012e2 64
40e140c9 65/*
121a5d44 66 * library wrappers to be used by non-LGPL compatible source code.
40e140c9 67 */
cf380c2f 68
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69extern void rcu_read_lock(void);
70extern void rcu_read_unlock(void);
cf380c2f 71
121a5d44 72extern void *rcu_dereference(void *p);
bb488185 73
121a5d44 74extern void *rcu_assign_pointer_sym(void **p, void *v);
cf380c2f 75
121a5d44 76#define rcu_assign_pointer(p, v) \
efafc824 77 rcu_assign_pointer_sym((void **)(&(p)), (v))
cf380c2f 78
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79extern 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
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83extern void *rcu_xchg_pointer_sym(void **p, void *v);
84#define rcu_xchg_pointer(p, v) \
85 rcu_xchg_pointer_sym((void **)(p), (v))
9d335088 86
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87extern void *rcu_publish_content_sym(void **p, void *v);
88#define rcu_publish_content(p, v) \
89 rcu_publish_content_sym((void **)(p), (v))
cf380c2f 90
121a5d44 91#endif /* !_LGPL_SOURCE */
f4a486ac 92
e462817e 93extern void synchronize_rcu(void);
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94
95/*
96 * Reader thread registration.
97 */
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98extern void rcu_register_thread(void);
99extern void rcu_unregister_thread(void);
27b012e2 100
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101/*
102 * Explicit urcu initialization, for "early" use within library constructors.
103 */
104extern void urcu_init(void);
105
27b012e2 106#endif /* _URCU_H */
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