Fix: update ax_pthread macro to handle newer clang
[urcu.git] / urcu-bp.h
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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>
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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
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40#ifdef __cplusplus
41extern "C" {
42#endif
43
ee6fabe1 44#include <urcu/map/urcu-bp.h>
5e77fc1f 45
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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
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54/*
55 * See urcu-pointer.h and urcu/static/urcu-pointer.h for pointer
56 * publication headers.
57 */
58#include <urcu-pointer.h>
59
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60#ifdef _LGPL_SOURCE
61
af7c2dbe 62#include <urcu/static/urcu-bp.h>
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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 */
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75#define rcu_read_lock_bp _rcu_read_lock
76#define rcu_read_unlock_bp _rcu_read_unlock
882f3357 77#define rcu_read_ongoing_bp _rcu_read_ongoing
fdee2e6d 78
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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
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84#else /* !_LGPL_SOURCE */
85
86/*
87 * library wrappers to be used by non-LGPL compatible source code.
af7c2dbe 88 * See LGPL-only urcu/static/urcu-pointer.h for documentation.
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89 */
90
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91extern void rcu_read_lock(void);
92extern void rcu_read_unlock(void);
882f3357 93extern int rcu_read_ongoing(void);
5efd3cd2 94
125ea9db 95extern void *rcu_dereference_sym_bp(void *p);
5efd3cd2 96#define rcu_dereference_bp(p) \
1b85da85 97 __extension__ \
5efd3cd2 98 ({ \
bdffa73a 99 __typeof__(p) _________p1 = URCU_FORCE_CAST(__typeof__(p), \
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100 rcu_dereference_sym_bp(URCU_FORCE_CAST(void *, p))); \
101 (_________p1); \
102 })
103
125ea9db 104extern void *rcu_cmpxchg_pointer_sym_bp(void **p, void *old, void *_new);
5efd3cd2 105#define rcu_cmpxchg_pointer_bp(p, old, _new) \
1b85da85 106 __extension__ \
5efd3cd2 107 ({ \
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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), \
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112 _________pold, \
113 _________pnew)); \
114 (_________p1); \
115 })
116
125ea9db 117extern void *rcu_xchg_pointer_sym_bp(void **p, void *v);
5efd3cd2 118#define rcu_xchg_pointer_bp(p, v) \
1b85da85 119 __extension__ \
5efd3cd2 120 ({ \
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121 __typeof__(*(p)) _________pv = (v); \
122 __typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)),\
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123 rcu_xchg_pointer_sym_bp(URCU_FORCE_CAST(void **, p), \
124 _________pv)); \
125 (_________p1); \
126 })
127
125ea9db 128extern void *rcu_set_pointer_sym_bp(void **p, void *v);
5efd3cd2 129#define rcu_set_pointer_bp(p, v) \
1b85da85 130 __extension__ \
5efd3cd2 131 ({ \
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132 __typeof__(*(p)) _________pv = (v); \
133 __typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)), \
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134 rcu_set_pointer_sym_bp(URCU_FORCE_CAST(void **, p), \
135 _________pv)); \
136 (_________p1); \
137 })
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138
139#endif /* !_LGPL_SOURCE */
140
141extern void synchronize_rcu(void);
142
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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 */
149extern void rcu_bp_before_fork(void);
150extern void rcu_bp_after_fork_parent(void);
151extern void rcu_bp_after_fork_child(void);
152
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153/*
154 * In the bulletproof version, the following functions are no-ops.
155 */
156static inline void rcu_register_thread(void)
157{
158}
159
160static inline void rcu_unregister_thread(void)
161{
162}
163
02be5561 164static inline void rcu_init(void)
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165{
166}
167
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168/*
169 * Q.S. reporting are no-ops for these URCU flavors.
170 */
171static inline void rcu_quiescent_state(void)
172{
173}
174
175static inline void rcu_thread_offline(void)
176{
177}
178
179static inline void rcu_thread_online(void)
180{
181}
182
67ecffc0 183#ifdef __cplusplus
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184}
185#endif
186
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187#include <urcu-call-rcu.h>
188#include <urcu-defer.h>
541d828d 189#include <urcu-flavor.h>
5e77fc1f 190
fdee2e6d 191#endif /* _URCU_BP_H */
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