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1 | |
2 | /* | |
3 | * urcu-pointer.c | |
4 | * | |
5 | * library wrappers to be used by non-LGPL compatible source code. | |
6 | * | |
7 | * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | |
8 | * Copyright (c) 2009 Paul E. McKenney, IBM Corporation. | |
9 | * | |
10 | * This library is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU Lesser General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2.1 of the License, or (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public | |
21 | * License along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
23 | * | |
24 | * IBM's contributions to this file may be relicensed under LGPLv2 or later. | |
25 | */ | |
26 | ||
27 | #include "urcu-pointer-static.h" | |
28 | /* Do not #define _LGPL_SOURCE to ensure we can emit the wrapper symbols */ | |
29 | #include "urcu-pointer.h" | |
30 | ||
31 | extern void synchronize_rcu(void); | |
32 | ||
33 | void *rcu_dereference(void *p) | |
34 | { | |
35 | return _rcu_dereference(p); | |
36 | } | |
37 | ||
38 | void *rcu_set_pointer_sym(void **p, void *v) | |
39 | { | |
40 | wmb(); | |
41 | return STORE_SHARED(*p, v); | |
42 | } | |
43 | ||
44 | void *rcu_xchg_pointer_sym(void **p, void *v) | |
45 | { | |
46 | wmb(); | |
47 | return uatomic_xchg(p, v); | |
48 | } | |
49 | ||
50 | void *rcu_cmpxchg_pointer_sym(void **p, void *old, void *_new) | |
51 | { | |
52 | wmb(); | |
53 | return uatomic_cmpxchg(p, old, _new); | |
54 | } |