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27b012e2 MD |
1 | #ifndef _URCU_H |
2 | #define _URCU_H | |
3 | ||
b257a10b MD |
4 | /* |
5 | * urcu.h | |
6 | * | |
7 | * Userspace RCU header | |
8 | * | |
af02d47e MD |
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 | * |
121a5d44 MD |
14 | * #define _LGPL_SOURCE |
15 | * #include <urcu.h> | |
16 | * | |
af02d47e MD |
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 | |
54843abc PM |
30 | * |
31 | * IBM's contributions to this file may be relicensed under LGPLv2 or later. | |
b257a10b MD |
32 | */ |
33 | ||
1430ee0b | 34 | #include <stdlib.h> |
69a757c9 | 35 | #include <pthread.h> |
1430ee0b | 36 | |
92b752ee MD |
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> |
3a86deba MD |
48 | |
49 | /* | |
121a5d44 MD |
50 | * Mappings for static use of the userspace RCU library. |
51 | * Should only be used in LGPL-compatible code. | |
3a86deba | 52 | */ |
3a86deba | 53 | |
121a5d44 MD |
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 MD |
58 | #define rcu_assign_pointer _rcu_assign_pointer |
59 | #define rcu_xchg_pointer _rcu_xchg_pointer | |
60 | #define rcu_publish_content _rcu_publish_content | |
41718ff9 | 61 | |
121a5d44 | 62 | #else /* !_LGPL_SOURCE */ |
27b012e2 | 63 | |
40e140c9 | 64 | /* |
121a5d44 | 65 | * library wrappers to be used by non-LGPL compatible source code. |
40e140c9 | 66 | */ |
cf380c2f | 67 | |
121a5d44 MD |
68 | extern void rcu_read_lock(void); |
69 | extern void rcu_read_unlock(void); | |
cf380c2f | 70 | |
121a5d44 | 71 | extern void *rcu_dereference(void *p); |
bb488185 | 72 | |
121a5d44 | 73 | extern void *rcu_assign_pointer_sym(void **p, void *v); |
cf380c2f | 74 | |
121a5d44 MD |
75 | #define rcu_assign_pointer(p, v) \ |
76 | rcu_assign_pointer_sym((void **)(p), (v)) | |
cf380c2f | 77 | |
121a5d44 MD |
78 | extern void *rcu_xchg_pointer_sym(void **p, void *v); |
79 | #define rcu_xchg_pointer(p, v) \ | |
80 | rcu_xchg_pointer_sym((void **)(p), (v)) | |
9d335088 | 81 | |
121a5d44 MD |
82 | extern void *rcu_publish_content_sym(void **p, void *v); |
83 | #define rcu_publish_content(p, v) \ | |
84 | rcu_publish_content_sym((void **)(p), (v)) | |
cf380c2f | 85 | |
121a5d44 | 86 | #endif /* !_LGPL_SOURCE */ |
f4a486ac | 87 | |
e462817e | 88 | extern void synchronize_rcu(void); |
27b012e2 MD |
89 | |
90 | /* | |
91 | * Reader thread registration. | |
92 | */ | |
121a5d44 MD |
93 | extern void rcu_register_thread(void); |
94 | extern void rcu_unregister_thread(void); | |
27b012e2 MD |
95 | |
96 | #endif /* _URCU_H */ |