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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 | * | |
12 | * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | |
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 | /* | |
41 | * See urcu-pointer.h and urcu-pointer-static.h for pointer publication headers. | |
42 | */ | |
43 | #include <urcu-pointer.h> | |
44 | ||
45 | /* | |
46 | * Important ! | |
47 | * | |
48 | * Each thread containing read-side critical sections must be registered | |
49 | * with rcu_register_thread() before calling rcu_read_lock(). | |
50 | * rcu_unregister_thread() should be called before the thread exits. | |
51 | */ | |
52 | ||
53 | #ifdef _LGPL_SOURCE | |
54 | ||
55 | #include <urcu-bp-static.h> | |
56 | ||
57 | /* | |
58 | * Mappings for static use of the userspace RCU library. | |
59 | * Should only be used in LGPL-compatible code. | |
60 | */ | |
61 | ||
62 | /* | |
63 | * rcu_read_lock() | |
64 | * rcu_read_unlock() | |
65 | * | |
66 | * Mark the beginning and end of a read-side critical section. | |
67 | */ | |
68 | #define rcu_read_lock() _rcu_read_lock() | |
69 | #define rcu_read_unlock() _rcu_read_unlock() | |
70 | ||
71 | #else /* !_LGPL_SOURCE */ | |
72 | ||
73 | /* | |
74 | * library wrappers to be used by non-LGPL compatible source code. | |
75 | * See LGPL-only urcu-pointer-static.h for documentation. | |
76 | */ | |
77 | ||
78 | extern void rcu_read_lock(void); | |
79 | extern void rcu_read_unlock(void); | |
80 | ||
81 | #endif /* !_LGPL_SOURCE */ | |
82 | ||
83 | extern void synchronize_rcu(void); | |
84 | ||
85 | /* | |
86 | * In the bulletproof version, the following functions are no-ops. | |
87 | */ | |
88 | static inline void rcu_register_thread(void) | |
89 | { | |
90 | } | |
91 | ||
92 | static inline void rcu_unregister_thread(void) | |
93 | { | |
94 | } | |
95 | ||
96 | static inline void urcu_init(void) | |
97 | { | |
98 | } | |
99 | ||
100 | #endif /* _URCU_BP_H */ |