79ee72a08e7110ba67a44b80f834096543eaa379
[urcu.git] / urcu-pointer.c
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_sym(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 if (likely(URCU_CAS_AVAIL()))
54 return uatomic_cmpxchg(p, old, _new);
55
56 /* Compatibility for i386. Old-timer. */
57 return compat_uatomic_cmpxchg(p, old, _new);
58 }
This page took 0.039309 seconds and 4 git commands to generate.