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fdee2e6d MD |
1 | #ifndef _URCU_BP_H |
2 | #define _URCU_BP_H | |
3 | ||
4 | /* | |
5 | * urcu-bp.h | |
6 | * | |
7 | * Userspace RCU header, "bulletproof" version. | |
8 | * | |
9 | * Slower RCU read-side adapted for tracing library. Does not require thread | |
10 | * registration nor unregistration. Also signal-safe. | |
11 | * | |
6982d6d7 | 12 | * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fdee2e6d MD |
13 | * Copyright (c) 2009 Paul E. McKenney, IBM Corporation. |
14 | * | |
15 | * LGPL-compatible code should include this header with : | |
16 | * | |
17 | * #define _LGPL_SOURCE | |
18 | * #include <urcu.h> | |
19 | * | |
20 | * This library is free software; you can redistribute it and/or | |
21 | * modify it under the terms of the GNU Lesser General Public | |
22 | * License as published by the Free Software Foundation; either | |
23 | * version 2.1 of the License, or (at your option) any later version. | |
24 | * | |
25 | * This library is distributed in the hope that it will be useful, | |
26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
28 | * Lesser General Public License for more details. | |
29 | * | |
30 | * You should have received a copy of the GNU Lesser General Public | |
31 | * License along with this library; if not, write to the Free Software | |
32 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
33 | * | |
34 | * IBM's contributions to this file may be relicensed under LGPLv2 or later. | |
35 | */ | |
36 | ||
37 | #include <stdlib.h> | |
38 | #include <pthread.h> | |
39 | ||
36bc70a8 MD |
40 | #ifdef __cplusplus |
41 | extern "C" { | |
42 | #endif | |
43 | ||
ee6fabe1 | 44 | #include <urcu/map/urcu-bp.h> |
5e77fc1f | 45 | |
fdee2e6d MD |
46 | /* |
47 | * Important ! | |
48 | * | |
49 | * Each thread containing read-side critical sections must be registered | |
50 | * with rcu_register_thread() before calling rcu_read_lock(). | |
51 | * rcu_unregister_thread() should be called before the thread exits. | |
52 | */ | |
53 | ||
5efd3cd2 MD |
54 | /* |
55 | * See urcu-pointer.h and urcu/static/urcu-pointer.h for pointer | |
56 | * publication headers. | |
57 | */ | |
58 | #include <urcu-pointer.h> | |
59 | ||
fdee2e6d MD |
60 | #ifdef _LGPL_SOURCE |
61 | ||
af7c2dbe | 62 | #include <urcu/static/urcu-bp.h> |
fdee2e6d MD |
63 | |
64 | /* | |
65 | * Mappings for static use of the userspace RCU library. | |
66 | * Should only be used in LGPL-compatible code. | |
67 | */ | |
68 | ||
69 | /* | |
70 | * rcu_read_lock() | |
71 | * rcu_read_unlock() | |
72 | * | |
73 | * Mark the beginning and end of a read-side critical section. | |
74 | */ | |
ef84facf PM |
75 | #define rcu_read_lock_bp _rcu_read_lock |
76 | #define rcu_read_unlock_bp _rcu_read_unlock | |
fdee2e6d | 77 | |
5efd3cd2 MD |
78 | #define rcu_dereference_bp rcu_dereference |
79 | #define rcu_cmpxchg_pointer_bp rcu_cmpxchg_pointer | |
80 | #define rcu_xchg_pointer_bp rcu_xchg_pointer | |
81 | #define rcu_set_pointer_bp rcu_set_pointer | |
82 | ||
fdee2e6d MD |
83 | #else /* !_LGPL_SOURCE */ |
84 | ||
85 | /* | |
86 | * library wrappers to be used by non-LGPL compatible source code. | |
af7c2dbe | 87 | * See LGPL-only urcu/static/urcu-pointer.h for documentation. |
fdee2e6d MD |
88 | */ |
89 | ||
125ea9db MD |
90 | extern void rcu_read_lock(void); |
91 | extern void rcu_read_unlock(void); | |
5efd3cd2 | 92 | |
125ea9db | 93 | extern void *rcu_dereference_sym_bp(void *p); |
5efd3cd2 | 94 | #define rcu_dereference_bp(p) \ |
20da51e4 | 95 | __extension__ \ |
5efd3cd2 | 96 | ({ \ |
bdffa73a | 97 | __typeof__(p) _________p1 = URCU_FORCE_CAST(__typeof__(p), \ |
5efd3cd2 MD |
98 | rcu_dereference_sym_bp(URCU_FORCE_CAST(void *, p))); \ |
99 | (_________p1); \ | |
100 | }) | |
101 | ||
125ea9db | 102 | extern void *rcu_cmpxchg_pointer_sym_bp(void **p, void *old, void *_new); |
5efd3cd2 | 103 | #define rcu_cmpxchg_pointer_bp(p, old, _new) \ |
20da51e4 | 104 | __extension__ \ |
5efd3cd2 | 105 | ({ \ |
bdffa73a MD |
106 | __typeof__(*(p)) _________pold = (old); \ |
107 | __typeof__(*(p)) _________pnew = (_new); \ | |
108 | __typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)), \ | |
109 | rcu_cmpxchg_pointer_sym_bp(URCU_FORCE_CAST(void **, p), \ | |
5efd3cd2 MD |
110 | _________pold, \ |
111 | _________pnew)); \ | |
112 | (_________p1); \ | |
113 | }) | |
114 | ||
125ea9db | 115 | extern void *rcu_xchg_pointer_sym_bp(void **p, void *v); |
5efd3cd2 | 116 | #define rcu_xchg_pointer_bp(p, v) \ |
20da51e4 | 117 | __extension__ \ |
5efd3cd2 | 118 | ({ \ |
bdffa73a MD |
119 | __typeof__(*(p)) _________pv = (v); \ |
120 | __typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)),\ | |
5efd3cd2 MD |
121 | rcu_xchg_pointer_sym_bp(URCU_FORCE_CAST(void **, p), \ |
122 | _________pv)); \ | |
123 | (_________p1); \ | |
124 | }) | |
125 | ||
125ea9db | 126 | extern void *rcu_set_pointer_sym_bp(void **p, void *v); |
5efd3cd2 | 127 | #define rcu_set_pointer_bp(p, v) \ |
20da51e4 | 128 | __extension__ \ |
5efd3cd2 | 129 | ({ \ |
bdffa73a MD |
130 | __typeof__(*(p)) _________pv = (v); \ |
131 | __typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)), \ | |
5efd3cd2 MD |
132 | rcu_set_pointer_sym_bp(URCU_FORCE_CAST(void **, p), \ |
133 | _________pv)); \ | |
134 | (_________p1); \ | |
135 | }) | |
fdee2e6d MD |
136 | |
137 | #endif /* !_LGPL_SOURCE */ | |
138 | ||
139 | extern void synchronize_rcu(void); | |
140 | ||
4cf1675f MD |
141 | /* |
142 | * rcu_bp_before_fork, rcu_bp_after_fork_parent and rcu_bp_after_fork_child | |
143 | * should be called around fork() system calls when the child process is not | |
144 | * expected to immediately perform an exec(). For pthread users, see | |
145 | * pthread_atfork(3). | |
146 | */ | |
147 | extern void rcu_bp_before_fork(void); | |
148 | extern void rcu_bp_after_fork_parent(void); | |
149 | extern void rcu_bp_after_fork_child(void); | |
150 | ||
fdee2e6d MD |
151 | /* |
152 | * In the bulletproof version, the following functions are no-ops. | |
153 | */ | |
154 | static inline void rcu_register_thread(void) | |
155 | { | |
156 | } | |
157 | ||
158 | static inline void rcu_unregister_thread(void) | |
159 | { | |
160 | } | |
161 | ||
02be5561 | 162 | static inline void rcu_init(void) |
fdee2e6d MD |
163 | { |
164 | } | |
165 | ||
51b03c6f MD |
166 | /* |
167 | * Q.S. reporting are no-ops for these URCU flavors. | |
168 | */ | |
169 | static inline void rcu_quiescent_state(void) | |
170 | { | |
171 | } | |
172 | ||
173 | static inline void rcu_thread_offline(void) | |
174 | { | |
175 | } | |
176 | ||
177 | static inline void rcu_thread_online(void) | |
178 | { | |
179 | } | |
180 | ||
36bc70a8 MD |
181 | #ifdef __cplusplus |
182 | } | |
183 | #endif | |
184 | ||
ee6fabe1 MD |
185 | #include <urcu-call-rcu.h> |
186 | #include <urcu-defer.h> | |
541d828d | 187 | #include <urcu-flavor.h> |
5e77fc1f | 188 | |
fdee2e6d | 189 | #endif /* _URCU_BP_H */ |