1 #ifndef _URCU_POINTER_H
2 #define _URCU_POINTER_H
7 * Userspace RCU header. Operations on pointers.
9 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
12 * This library is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Lesser General Public
14 * License as published by the Free Software Foundation; either
15 * version 2.1 of the License, or (at your option) any later version.
17 * This library is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with this library; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 * IBM's contributions to this file may be relicensed under LGPLv2 or later.
29 #include <urcu/compiler.h>
30 #include <urcu/arch.h>
31 #include <urcu/uatomic.h>
32 #include <urcu/urcu-checker.h>
38 #if defined(_LGPL_SOURCE) || defined(URCU_INLINE_SMALL_FUNCTIONS)
40 #include <urcu/static/urcu-pointer.h>
43 * rcu_dereference(ptr)
45 * Fetch a RCU-protected pointer. Typically used to copy the variable ptr to a
48 #define rcu_dereference(p) \
50 rcu_read_ongoing_check_debug(__func__); \
51 _rcu_dereference(p); \
55 * type *rcu_cmpxchg_pointer(type **ptr, type *new, type *old)
56 * type *rcu_xchg_pointer(type **ptr, type *new)
57 * void rcu_set_pointer(type **ptr, type *new)
59 * RCU pointer updates.
60 * @ptr: address of the pointer to modify
61 * @new: new pointer value
62 * @old: old pointer value (expected)
64 * return: old pointer value
66 #define rcu_cmpxchg_pointer _rcu_cmpxchg_pointer
67 #define rcu_xchg_pointer _rcu_xchg_pointer
68 #define rcu_set_pointer _rcu_set_pointer
70 #else /* !(defined(_LGPL_SOURCE) || defined(URCU_INLINE_SMALL_FUNCTIONS)) */
72 extern void *rcu_dereference_sym(void *p
);
73 #define rcu_dereference(p) \
75 __typeof__(p) _________p1 = URCU_FORCE_CAST(__typeof__(p), \
76 rcu_dereference_sym(URCU_FORCE_CAST(void *, p))); \
80 extern void *rcu_cmpxchg_pointer_sym(void **p
, void *old
, void *_new
);
81 #define rcu_cmpxchg_pointer(p, old, _new) \
83 __typeof__(*(p)) _________pold = (old); \
84 __typeof__(*(p)) _________pnew = (_new); \
85 __typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)), \
86 rcu_cmpxchg_pointer_sym(URCU_FORCE_CAST(void **, p), \
92 extern void *rcu_xchg_pointer_sym(void **p
, void *v
);
93 #define rcu_xchg_pointer(p, v) \
95 __typeof__(*(p)) _________pv = (v); \
96 __typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)), \
97 rcu_xchg_pointer_sym(URCU_FORCE_CAST(void **, p), \
103 * Note: rcu_set_pointer_sym returns @v because we don't want to break
104 * the ABI. At the API level, rcu_set_pointer() now returns void. Use of
105 * the return value is therefore deprecated, and will cause a build
108 extern void *rcu_set_pointer_sym(void **p
, void *v
);
109 #define rcu_set_pointer(p, v) \
111 __typeof__(*(p)) _________pv = (v); \
112 (void) rcu_set_pointer_sym(URCU_FORCE_CAST(void **, p), \
116 #endif /* !(defined(_LGPL_SOURCE) || defined(URCU_INLINE_SMALL_FUNCTIONS)) */
119 * void rcu_assign_pointer(type *ptr, type *new)
121 * Same as rcu_set_pointer, but takes the pointer to assign to rather than its
122 * address as first parameter. Provided for compatibility with the Linux kernel
125 #define rcu_assign_pointer(p, v) rcu_set_pointer((&p), (v))
131 #endif /* _URCU_POINTER_H */
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