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1 | #ifndef _LTTNG_UST_URCU_H |
2 | #define _LTTNG_UST_URCU_H | |
3 | ||
4 | /* | |
5 | * urcu-ust.h | |
6 | * | |
7 | * Userspace RCU header for LTTng-UST. Derived from liburcu | |
8 | * "bulletproof" flavor. | |
9 | * | |
10 | * Slower RCU read-side adapted for tracing library. Does not require thread | |
11 | * registration nor unregistration. Also signal-safe. | |
12 | * | |
13 | * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
14 | * Copyright (c) 2009 Paul E. McKenney, IBM Corporation. | |
15 | * | |
16 | * LGPL-compatible code should include this header with : | |
17 | * | |
18 | * #define _LGPL_SOURCE | |
19 | * #include <lttng/urcu-ust.h> | |
20 | * | |
21 | * This library is free software; you can redistribute it and/or | |
22 | * modify it under the terms of the GNU Lesser General Public | |
23 | * License as published by the Free Software Foundation; either | |
24 | * version 2.1 of the License, or (at your option) any later version. | |
25 | * | |
26 | * This library is distributed in the hope that it will be useful, | |
27 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
29 | * Lesser General Public License for more details. | |
30 | * | |
31 | * You should have received a copy of the GNU Lesser General Public | |
32 | * License along with this library; if not, write to the Free Software | |
33 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
34 | * | |
35 | * IBM's contributions to this file may be relicensed under LGPLv2 or later. | |
36 | */ | |
37 | ||
38 | #include <stdlib.h> | |
39 | #include <pthread.h> | |
40 | ||
41 | #ifdef __cplusplus | |
42 | extern "C" { | |
43 | #endif | |
44 | ||
45 | /* | |
46 | * See lttng/urcu/pointer.h and lttng/urcu/static/pointer.h for pointer | |
47 | * publication headers. | |
48 | */ | |
49 | #include <lttng/urcu/pointer.h> | |
50 | ||
51 | #ifdef _LGPL_SOURCE | |
52 | ||
53 | #include <lttng/urcu/static/urcu-ust.h> | |
54 | ||
55 | /* | |
56 | * Mappings for static use of the userspace RCU library. | |
57 | * Should only be used in LGPL-compatible code. | |
58 | */ | |
59 | ||
60 | /* | |
61 | * lttng_ust_urcu_read_lock() | |
62 | * lttng_ust_urcu_read_unlock() | |
63 | * | |
64 | * Mark the beginning and end of a read-side critical section. | |
65 | */ | |
66 | #define lttng_ust_urcu_read_lock _lttng_ust_urcu_read_lock | |
67 | #define lttng_ust_urcu_read_unlock _lttng_ust_urcu_read_unlock | |
68 | #define lttng_ust_urcu_read_ongoing _lttng_ust_urcu_read_ongoing | |
69 | ||
70 | #else /* !_LGPL_SOURCE */ | |
71 | ||
72 | /* | |
73 | * library wrappers to be used by non-LGPL compatible source code. | |
74 | * See LGPL-only urcu/static/pointer.h for documentation. | |
75 | */ | |
76 | ||
77 | extern void lttng_ust_urcu_read_lock(void); | |
78 | extern void lttng_ust_urcu_read_unlock(void); | |
79 | extern int lttng_ust_urcu_read_ongoing(void); | |
80 | ||
81 | #endif /* !_LGPL_SOURCE */ | |
82 | ||
83 | extern void lttng_ust_urcu_synchronize_rcu(void); | |
84 | ||
85 | /* | |
86 | * lttng_ust_urcu_before_fork, lttng_ust_urcu_after_fork_parent and | |
87 | * lttng_ust_urcu_after_fork_child should be called around fork() system | |
88 | * calls when the child process is not expected to immediately perform | |
89 | * an exec(). For pthread users, see pthread_atfork(3). | |
90 | */ | |
91 | extern void lttng_ust_urcu_before_fork(void); | |
92 | extern void lttng_ust_urcu_after_fork_parent(void); | |
93 | extern void lttng_ust_urcu_after_fork_child(void); | |
94 | ||
95 | /* | |
96 | * In the UST version, thread registration is performed lazily, but it can be | |
97 | * forced by issuing an explicit lttng_ust_urcu_register_thread(). | |
98 | */ | |
99 | extern void lttng_ust_urcu_register_thread(void); | |
100 | ||
101 | #ifdef __cplusplus | |
102 | } | |
103 | #endif | |
104 | ||
105 | #endif /* _LTTNG_UST_URCU_H */ |