9a2c82f4b1e503155de664a545c8c5e5697c5608
7 * Userspace RCU QSBR header.
9 * LGPL-compatible code should include this header with :
11 * #define _LGPL_SOURCE
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.
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.
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
28 * IBM's contributions to this file may be relicensed under LGPLv2 or later.
37 * Each thread containing read-side critical sections must be registered
38 * with rcu_register_thread() before calling rcu_read_lock().
39 * rcu_unregister_thread() should be called before the thread exits.
44 #include <urcu-qsbr-static.h>
47 * Mappings for static use of the userspace RCU library.
48 * Should only be used in LGPL-compatible code.
51 #define rcu_dereference _rcu_dereference
52 #define rcu_read_lock _rcu_read_lock
53 #define rcu_read_unlock _rcu_read_unlock
55 #define rcu_quiescent_state _rcu_quiescent_state
56 #define rcu_thread_offline _rcu_thread_offline
57 #define rcu_thread_online _rcu_thread_online
59 #define rcu_assign_pointer _rcu_assign_pointer
60 #define rcu_xchg_pointer _rcu_xchg_pointer
61 #define rcu_publish_content _rcu_publish_content
63 #else /* !_LGPL_SOURCE */
66 * library wrappers to be used by non-LGPL compatible source code.
70 * QSBR read lock/unlock are guaranteed to be no-ops. Therefore, we expose them
71 * in the LGPL header for any code to use. However, the debug version is not
72 * nops and may contain sanity checks. To activate it, applications must be
73 * recompiled with -DURCU_DEBUG (even non-LGPL/GPL applications). This is the
74 * best trade-off between license/performance/code triviality and
75 * library debugging & tracing features we could come up with.
78 #if (!defined(BUILD_QSBR_LIB) && defined(URCU_DEBUG))
80 static inline void rcu_read_lock(void)
84 static inline void rcu_read_lock(void)
88 #else /* !URCU_DEBUG */
90 extern void rcu_read_lock(void);
91 extern void rcu_read_unlock(void);
93 #endif /* !URCU_DEBUG */
95 extern void *rcu_dereference(void *p
);
97 extern void rcu_quiescent_state(void);
98 extern void rcu_thread_offline(void);
99 extern void rcu_thread_online(void);
101 extern void *rcu_assign_pointer_sym(void **p
, void *v
);
103 #define rcu_assign_pointer(p, v) \
104 rcu_assign_pointer_sym((void **)(p), (v))
106 extern void *rcu_xchg_pointer_sym(void **p
, void *v
);
107 #define rcu_xchg_pointer(p, v) \
108 rcu_xchg_pointer_sym((void **)(p), (v))
110 extern void *rcu_publish_content_sym(void **p
, void *v
);
111 #define rcu_publish_content(p, v) \
112 rcu_publish_content_sym((void **)(p), (v))
114 #endif /* !_LGPL_SOURCE */
116 extern void synchronize_rcu(void);
119 * Reader thread registration.
121 extern void rcu_register_thread(void);
122 extern void rcu_unregister_thread(void);
124 #endif /* _URCU_QSBR_H */
This page took 0.068674 seconds and 4 git commands to generate.