7 * Userspace RCU header, "bulletproof" version.
9 * Slower RCU read-side adapted for tracing library. Does not require thread
10 * registration nor unregistration. Also signal-safe.
12 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
13 * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
15 * LGPL-compatible code should include this header with :
17 * #define _LGPL_SOURCE
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.
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.
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
34 * IBM's contributions to this file may be relicensed under LGPLv2 or later.
44 #include <urcu/map/urcu-bp.h>
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.
55 * See urcu-pointer.h and urcu/static/urcu-pointer.h for pointer
56 * publication headers.
58 #include <urcu-pointer.h>
62 #include <urcu/static/urcu-bp.h>
65 * Mappings for static use of the userspace RCU library.
66 * Should only be used in LGPL-compatible code.
73 * Mark the beginning and end of a read-side critical section.
75 #define rcu_read_lock_bp _rcu_read_lock
76 #define rcu_read_unlock_bp _rcu_read_unlock
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
83 #else /* !_LGPL_SOURCE */
86 * library wrappers to be used by non-LGPL compatible source code.
87 * See LGPL-only urcu/static/urcu-pointer.h for documentation.
90 extern void rcu_read_lock(void);
91 extern void rcu_read_unlock(void);
93 extern void *rcu_dereference_sym_bp(void *p
);
94 #define rcu_dereference_bp(p) \
97 __typeof__(p) _________p1 = URCU_FORCE_CAST(__typeof__(p), \
98 rcu_dereference_sym_bp(URCU_FORCE_CAST(void *, p))); \
102 extern void *rcu_cmpxchg_pointer_sym_bp(void **p
, void *old
, void *_new
);
103 #define rcu_cmpxchg_pointer_bp(p, old, _new) \
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), \
115 extern void *rcu_xchg_pointer_sym_bp(void **p
, void *v
);
116 #define rcu_xchg_pointer_bp(p, v) \
119 __typeof__(*(p)) _________pv = (v); \
120 __typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)),\
121 rcu_xchg_pointer_sym_bp(URCU_FORCE_CAST(void **, p), \
126 extern void *rcu_set_pointer_sym_bp(void **p
, void *v
);
127 #define rcu_set_pointer_bp(p, v) \
130 __typeof__(*(p)) _________pv = (v); \
131 __typeof__(*(p)) _________p1 = URCU_FORCE_CAST(__typeof__(*(p)), \
132 rcu_set_pointer_sym_bp(URCU_FORCE_CAST(void **, p), \
137 #endif /* !_LGPL_SOURCE */
139 extern void synchronize_rcu(void);
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
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);
152 * In the bulletproof version, the following functions are no-ops.
154 static inline void rcu_register_thread(void)
158 static inline void rcu_unregister_thread(void)
162 static inline void rcu_init(void)
167 * Q.S. reporting are no-ops for these URCU flavors.
169 static inline void rcu_quiescent_state(void)
173 static inline void rcu_thread_offline(void)
177 static inline void rcu_thread_online(void)
185 #include <urcu-call-rcu.h>
186 #include <urcu-defer.h>
187 #include <urcu-flavor.h>
189 #endif /* _URCU_BP_H */
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