projects / lttng-ust.git / blame
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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 */ |