projects / lttng-ust.git / blame
| Commit | Line | Data |
|---|---|---|
| 10544ee8 | 1 | /* |
| c0c0989a MJ |
2 | * SPDX-License-Identifier: LGPL-2.1-or-later |
| 3 | * | |
| 4 | * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
| 5 | * Copyright (c) 2009 Paul E. McKenney, IBM Corporation. | |
| 10544ee8 MD |
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 | * | |
| 10544ee8 MD |
13 | * LGPL-compatible code should include this header with : |
| 14 | * | |
| 15 | * #define _LGPL_SOURCE | |
| 16 | * #include <lttng/urcu-ust.h> | |
| 10544ee8 MD |
17 | */ |
| 18 | ||
| c0c0989a MJ |
19 | #ifndef _LTTNG_UST_URCU_H |
| 20 | #define _LTTNG_UST_URCU_H | |
| 21 | ||
| 10544ee8 MD |
22 | #include <stdlib.h> |
| 23 | #include <pthread.h> | |
| 24 | ||
| 25 | #ifdef __cplusplus | |
| 26 | extern "C" { | |
| 27 | #endif | |
| 28 | ||
| 29 | /* | |
| 30 | * See lttng/urcu/pointer.h and lttng/urcu/static/pointer.h for pointer | |
| 31 | * publication headers. | |
| 32 | */ | |
| 33 | #include <lttng/urcu/pointer.h> | |
| 34 | ||
| 35 | #ifdef _LGPL_SOURCE | |
| 36 | ||
| 37 | #include <lttng/urcu/static/urcu-ust.h> | |
| 38 | ||
| 39 | /* | |
| 40 | * Mappings for static use of the userspace RCU library. | |
| 41 | * Should only be used in LGPL-compatible code. | |
| 42 | */ | |
| 43 | ||
| 44 | /* | |
| 45 | * lttng_ust_urcu_read_lock() | |
| 46 | * lttng_ust_urcu_read_unlock() | |
| 47 | * | |
| 48 | * Mark the beginning and end of a read-side critical section. | |
| 49 | */ | |
| 50 | #define lttng_ust_urcu_read_lock _lttng_ust_urcu_read_lock | |
| 51 | #define lttng_ust_urcu_read_unlock _lttng_ust_urcu_read_unlock | |
| 52 | #define lttng_ust_urcu_read_ongoing _lttng_ust_urcu_read_ongoing | |
| 53 | ||
| 54 | #else /* !_LGPL_SOURCE */ | |
| 55 | ||
| 56 | /* | |
| 57 | * library wrappers to be used by non-LGPL compatible source code. | |
| 58 | * See LGPL-only urcu/static/pointer.h for documentation. | |
| 59 | */ | |
| 60 | ||
| 61 | extern void lttng_ust_urcu_read_lock(void); | |
| 62 | extern void lttng_ust_urcu_read_unlock(void); | |
| 63 | extern int lttng_ust_urcu_read_ongoing(void); | |
| 64 | ||
| 65 | #endif /* !_LGPL_SOURCE */ | |
| 66 | ||
| 67 | extern void lttng_ust_urcu_synchronize_rcu(void); | |
| 68 | ||
| 69 | /* | |
| 70 | * lttng_ust_urcu_before_fork, lttng_ust_urcu_after_fork_parent and | |
| 71 | * lttng_ust_urcu_after_fork_child should be called around fork() system | |
| 72 | * calls when the child process is not expected to immediately perform | |
| 73 | * an exec(). For pthread users, see pthread_atfork(3). | |
| 74 | */ | |
| 75 | extern void lttng_ust_urcu_before_fork(void); | |
| 76 | extern void lttng_ust_urcu_after_fork_parent(void); | |
| 77 | extern void lttng_ust_urcu_after_fork_child(void); | |
| 78 | ||
| 79 | /* | |
| 80 | * In the UST version, thread registration is performed lazily, but it can be | |
| 81 | * forced by issuing an explicit lttng_ust_urcu_register_thread(). | |
| 82 | */ | |
| 83 | extern void lttng_ust_urcu_register_thread(void); | |
| 84 | ||
| 85 | #ifdef __cplusplus | |
| 86 | } | |
| 87 | #endif | |
| 88 | ||
| 89 | #endif /* _LTTNG_UST_URCU_H */ |