LGPLv2.1 relicensing
[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 *
9 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
10 *
121a5d44 11 * Credits for Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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12 * for inspiration coming from the Linux kernel RCU and rcu-preempt.
13 *
121a5d44 14 * LGPL-compatible code should include this header with :
5e7e64b9 15 *
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16 * #define _LGPL_SOURCE
17 * #include <urcu.h>
18 *
19 * Distributed under LGPLv2.1
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20 *
21 * IBM's contributions to this file may be relicensed under LGPLv2 or later.
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22 */
23
1430ee0b 24#include <stdlib.h>
69a757c9 25#include <pthread.h>
1430ee0b 26
121a5d44 27#ifdef _LGPL_SOURCE
b0d5e790 28
121a5d44 29#include <urcu-static.h>
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30
31/*
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32 * Mappings for static use of the userspace RCU library.
33 * Should only be used in LGPL-compatible code.
3a86deba 34 */
3a86deba 35
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36#define rcu_dereference _rcu_dereference
37#define rcu_read_lock _rcu_read_lock
38#define rcu_read_unlock _rcu_read_unlock
41718ff9 39
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40#define rcu_assign_pointer _rcu_assign_pointer
41#define rcu_xchg_pointer _rcu_xchg_pointer
42#define rcu_publish_content _rcu_publish_content
41718ff9 43
121a5d44 44#else /* !_LGPL_SOURCE */
27b012e2 45
40e140c9 46/*
121a5d44 47 * library wrappers to be used by non-LGPL compatible source code.
40e140c9 48 */
cf380c2f 49
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50extern void rcu_read_lock(void);
51extern void rcu_read_unlock(void);
cf380c2f 52
121a5d44 53extern void *rcu_dereference(void *p);
bb488185 54
121a5d44 55extern void *rcu_assign_pointer_sym(void **p, void *v);
cf380c2f 56
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57#define rcu_assign_pointer(p, v) \
58 rcu_assign_pointer_sym((void **)(p), (v))
cf380c2f 59
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60extern void *rcu_xchg_pointer_sym(void **p, void *v);
61#define rcu_xchg_pointer(p, v) \
62 rcu_xchg_pointer_sym((void **)(p), (v))
9d335088 63
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64extern void *rcu_publish_content_sym(void **p, void *v);
65#define rcu_publish_content(p, v) \
66 rcu_publish_content_sym((void **)(p), (v))
cf380c2f 67
121a5d44 68#endif /* !_LGPL_SOURCE */
f4a486ac 69
e462817e 70extern void synchronize_rcu(void);
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71
72/*
73 * Reader thread registration.
74 */
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75extern void rcu_register_thread(void);
76extern void rcu_unregister_thread(void);
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77
78#endif /* _URCU_H */
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