Fix: update ax_pthread macro to handle newer clang
[urcu.git] / urcu-qsbr.h
1 #ifndef _URCU_QSBR_H
2 #define _URCU_QSBR_H
3
4 /*
5 * urcu-qsbr.h
6 *
7 * Userspace RCU QSBR header.
8 *
9 * LGPL-compatible code should include this header with :
10 *
11 * #define _LGPL_SOURCE
12 * #include <urcu.h>
13 *
14 * This library is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU Lesser General Public
16 * License as published by the Free Software Foundation; either
17 * version 2.1 of the License, or (at your option) any later version.
18 *
19 * This library is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 * Lesser General Public License for more details.
23 *
24 * You should have received a copy of the GNU Lesser General Public
25 * License along with this library; if not, write to the Free Software
26 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 *
28 * IBM's contributions to this file may be relicensed under LGPLv2 or later.
29 */
30
31 #include <stdlib.h>
32 #include <pthread.h>
33
34 /*
35 * See urcu-pointer.h and urcu/static/urcu-pointer.h for pointer
36 * publication headers.
37 */
38 #include <urcu-pointer.h>
39
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43
44 #include <urcu/map/urcu-qsbr.h>
45
46 #ifdef RCU_DEBUG /* For backward compatibility */
47 #define DEBUG_RCU
48 #endif
49
50 /*
51 * Important !
52 *
53 * Each thread containing read-side critical sections must be registered
54 * with rcu_register_thread() before calling rcu_read_lock().
55 * rcu_unregister_thread() should be called before the thread exits.
56 */
57
58 #ifdef _LGPL_SOURCE
59
60 #include <urcu/static/urcu-qsbr.h>
61
62 /*
63 * Mappings for static use of the userspace RCU library.
64 * Should only be used in LGPL-compatible code.
65 */
66
67 /*
68 * rcu_read_lock()
69 * rcu_read_unlock()
70 *
71 * Mark the beginning and end of a read-side critical section.
72 * DON'T FORGET TO USE rcu_register_thread/rcu_unregister_thread()
73 * FOR EACH THREAD WITH READ-SIDE CRITICAL SECTION.
74 */
75 #define rcu_read_lock_qsbr _rcu_read_lock
76 #define rcu_read_unlock_qsbr _rcu_read_unlock
77 #define rcu_read_ongoing_qsbr _rcu_read_ongoing
78
79 #define rcu_quiescent_state_qsbr _rcu_quiescent_state
80 #define rcu_thread_offline_qsbr _rcu_thread_offline
81 #define rcu_thread_online_qsbr _rcu_thread_online
82
83 #else /* !_LGPL_SOURCE */
84
85 /*
86 * library wrappers to be used by non-LGPL compatible source code.
87 */
88
89 /*
90 * QSBR read lock/unlock are guaranteed to be no-ops. Therefore, we expose them
91 * in the LGPL header for any code to use. However, the debug version is not
92 * nops and may contain sanity checks. To activate it, applications must be
93 * recompiled with -DDEBUG_RCU (even non-LGPL/GPL applications). This is the
94 * best trade-off between license/performance/code triviality and
95 * library debugging & tracing features we could come up with.
96 */
97
98 #if (!defined(BUILD_QSBR_LIB) && !defined(DEBUG_RCU))
99
100 static inline void rcu_read_lock(void)
101 {
102 }
103
104 static inline void rcu_read_unlock(void)
105 {
106 }
107
108 #else /* !DEBUG_RCU */
109
110 extern void rcu_read_lock(void);
111 extern void rcu_read_unlock(void);
112
113 #endif /* !DEBUG_RCU */
114
115 extern int rcu_read_ongoing(void);
116 extern void rcu_quiescent_state(void);
117 extern void rcu_thread_offline(void);
118 extern void rcu_thread_online(void);
119
120 #endif /* !_LGPL_SOURCE */
121
122 extern void synchronize_rcu(void);
123
124 /*
125 * Reader thread registration.
126 */
127 extern void rcu_register_thread(void);
128 extern void rcu_unregister_thread(void);
129
130 #ifdef __cplusplus
131 }
132 #endif
133
134 #include <urcu-call-rcu.h>
135 #include <urcu-defer.h>
136 #include <urcu-flavor.h>
137
138 #endif /* _URCU_QSBR_H */
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