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10544ee8 MD |
1 | /* |
2 | * lttng-ust-urcu-pointer.c | |
3 | * | |
4 | * library wrappers to be used by non-LGPL compatible source code. | |
5 | * | |
6 | * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
7 | * Copyright (c) 2009 Paul E. McKenney, IBM Corporation. | |
8 | * | |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | * | |
23 | * IBM's contributions to this file may be relicensed under LGPLv2 or later. | |
24 | */ | |
25 | ||
26 | #include <urcu/uatomic.h> | |
27 | ||
28 | #include <lttng/urcu/static/pointer.h> | |
29 | /* Do not #define _LGPL_SOURCE to ensure we can emit the wrapper symbols */ | |
30 | #include <lttng/urcu/pointer.h> | |
31 | ||
32 | void *lttng_ust_rcu_dereference_sym(void *p) | |
33 | { | |
34 | return _lttng_ust_rcu_dereference(p); | |
35 | } | |
36 | ||
37 | void *lttng_ust_rcu_set_pointer_sym(void **p, void *v) | |
38 | { | |
39 | cmm_wmb(); | |
40 | uatomic_set(p, v); | |
41 | return v; | |
42 | } | |
43 | ||
44 | void *lttng_ust_rcu_xchg_pointer_sym(void **p, void *v) | |
45 | { | |
46 | cmm_wmb(); | |
47 | return uatomic_xchg(p, v); | |
48 | } | |
49 | ||
50 | void *lttng_ust_rcu_cmpxchg_pointer_sym(void **p, void *old, void *_new) | |
51 | { | |
52 | cmm_wmb(); | |
53 | return uatomic_cmpxchg(p, old, _new); | |
54 | } |