Fix: tests: invoke destroy APIs for queues/stacks
[urcu.git] / urcu-bp.h
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 *
12 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43
44 #include <urcu/map/urcu-bp.h>
45
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
54 /*
55 * See urcu-pointer.h and urcu/static/urcu-pointer.h for pointer
56 * publication headers.
57 */
58 #include <urcu-pointer.h>
59
60 #ifdef _LGPL_SOURCE
61
62 #include <urcu/static/urcu-bp.h>
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 */
75 #define rcu_read_lock_bp _rcu_read_lock
76 #define rcu_read_unlock_bp _rcu_read_unlock
77 #define rcu_read_ongoing_bp _rcu_read_ongoing
78
79 #define rcu_dereference_bp rcu_dereference
80 #define rcu_cmpxchg_pointer_bp rcu_cmpxchg_pointer
81 #define rcu_xchg_pointer_bp rcu_xchg_pointer
82 #define rcu_set_pointer_bp rcu_set_pointer
83
84 #else /* !_LGPL_SOURCE */
85
86 /*
87 * library wrappers to be used by non-LGPL compatible source code.
88 * See LGPL-only urcu/static/urcu-pointer.h for documentation.
89 */
90
91 extern void rcu_read_lock(void);
92 extern void rcu_read_unlock(void);
93 extern int rcu_read_ongoing(void);
94
95 extern void *rcu_dereference_sym_bp(void *p);
96 #define rcu_dereference_bp(p) \
97 __extension__ \
98 ({ \
99 __typeof__(p) _________p1 = URCU_FORCE_CAST(__typeof__(p), \
100 rcu_dereference_sym_bp(URCU_FORCE_CAST(void *, p))); \
101 (_________p1); \
102 })
103
104 extern void *rcu_cmpxchg_pointer_sym_bp(void **p, void *old, void *_new);
105 #define rcu_cmpxchg_pointer_bp(p, old, _new) \
106 __extension__ \
107 ({ \
108 __typeof__(*(p)) _________pold = (old); \
109 __typeof__(*(p)) _________pnew = (_new); \
110 __typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)), \
111 rcu_cmpxchg_pointer_sym_bp(URCU_FORCE_CAST(void **, p), \
112 _________pold, \
113 _________pnew)); \
114 (_________p1); \
115 })
116
117 extern void *rcu_xchg_pointer_sym_bp(void **p, void *v);
118 #define rcu_xchg_pointer_bp(p, v) \
119 __extension__ \
120 ({ \
121 __typeof__(*(p)) _________pv = (v); \
122 __typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)),\
123 rcu_xchg_pointer_sym_bp(URCU_FORCE_CAST(void **, p), \
124 _________pv)); \
125 (_________p1); \
126 })
127
128 extern void *rcu_set_pointer_sym_bp(void **p, void *v);
129 #define rcu_set_pointer_bp(p, v) \
130 __extension__ \
131 ({ \
132 __typeof__(*(p)) _________pv = (v); \
133 __typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)), \
134 rcu_set_pointer_sym_bp(URCU_FORCE_CAST(void **, p), \
135 _________pv)); \
136 (_________p1); \
137 })
138
139 #endif /* !_LGPL_SOURCE */
140
141 extern void synchronize_rcu(void);
142
143 /*
144 * rcu_bp_before_fork, rcu_bp_after_fork_parent and rcu_bp_after_fork_child
145 * should be called around fork() system calls when the child process is not
146 * expected to immediately perform an exec(). For pthread users, see
147 * pthread_atfork(3).
148 */
149 extern void rcu_bp_before_fork(void);
150 extern void rcu_bp_after_fork_parent(void);
151 extern void rcu_bp_after_fork_child(void);
152
153 /*
154 * In the bulletproof version, the following functions are no-ops.
155 */
156 static inline void rcu_register_thread(void)
157 {
158 }
159
160 static inline void rcu_unregister_thread(void)
161 {
162 }
163
164 static inline void rcu_init(void)
165 {
166 }
167
168 /*
169 * Q.S. reporting are no-ops for these URCU flavors.
170 */
171 static inline void rcu_quiescent_state(void)
172 {
173 }
174
175 static inline void rcu_thread_offline(void)
176 {
177 }
178
179 static inline void rcu_thread_online(void)
180 {
181 }
182
183 #ifdef __cplusplus
184 }
185 #endif
186
187 #include <urcu-call-rcu.h>
188 #include <urcu-defer.h>
189 #include <urcu-flavor.h>
190
191 #endif /* _URCU_BP_H */
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