projects / lttng-ust.git / blame
| Commit | Line | Data |
|---|---|---|
| 8d8a24c8 MD |
1 | /* |
| 2 | * Copyright (C) 2010 Pierre-Marc Fournier | |
| 3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
| 518d7abb PMF |
4 | * |
| 5 | * This library is free software; you can redistribute it and/or | |
| 6 | * modify it under the terms of the GNU Lesser General Public | |
| 8d8a24c8 MD |
7 | * License as published by the Free Software Foundation; version 2.1 of |
| 8 | * the License. | |
| 518d7abb PMF |
9 | * |
| 10 | * This library is distributed in the hope that it will be useful, | |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | * Lesser General Public License for more details. | |
| 14 | * | |
| 15 | * You should have received a copy of the GNU Lesser General Public | |
| 16 | * License along with this library; if not, write to the Free Software | |
| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 18 | */ | |
| 19 | ||
| 9c6bb081 JD |
20 | #ifndef _UST_CLOCK_H |
| 21 | #define _UST_CLOCK_H | |
| 518d7abb | 22 | |
| ca4525b5 | 23 | #include <time.h> |
| 518d7abb | 24 | #include <sys/time.h> |
| 9edd34bd MD |
25 | #include <stdint.h> |
| 26 | #include <stddef.h> | |
| 939950af | 27 | #include <stdio.h> |
| f9364363 MD |
28 | #include <urcu/system.h> |
| 29 | #include <urcu/arch.h> | |
| 30 | #include <lttng/ust-clock.h> | |
| 31 | ||
| eda498b8 | 32 | #include "lttng-ust-uuid.h" |
| 518d7abb | 33 | |
| f9364363 MD |
34 | struct lttng_trace_clock { |
| 35 | uint64_t (*read64)(void); | |
| 36 | uint64_t (*freq)(void); | |
| 37 | int (*uuid)(char *uuid); | |
| 38 | const char *(*name)(void); | |
| 39 | const char *(*description)(void); | |
| 40 | }; | |
| 518d7abb | 41 | |
| f9364363 | 42 | extern struct lttng_trace_clock *lttng_trace_clock; |
| 518d7abb | 43 | |
| f9364363 MD |
44 | void lttng_ust_clock_init(void); |
| 45 | ||
| 46 | /* Use the kernel MONOTONIC clock. */ | |
| 518d7abb | 47 | |
| 28b12049 | 48 | static __inline__ |
| f9364363 | 49 | uint64_t trace_clock_read64_monotonic(void) |
| 9c6bb081 JD |
50 | { |
| 51 | struct timespec ts; | |
| 9c6bb081 | 52 | |
| 77686037 MD |
53 | if (caa_unlikely(clock_gettime(CLOCK_MONOTONIC, &ts))) { |
| 54 | ts.tv_sec = 0; | |
| 55 | ts.tv_nsec = 0; | |
| 56 | } | |
| dc190cc1 | 57 | return ((uint64_t) ts.tv_sec * 1000000000ULL) + ts.tv_nsec; |
| 9c6bb081 JD |
58 | } |
| 59 | ||
| f9364363 MD |
60 | static __inline__ |
| 61 | uint64_t trace_clock_read64(void) | |
| 62 | { | |
| 63 | struct lttng_trace_clock *ltc = CMM_LOAD_SHARED(lttng_trace_clock); | |
| 64 | ||
| 65 | if (caa_likely(!ltc)) { | |
| 66 | return trace_clock_read64_monotonic(); | |
| 67 | } else { | |
| 68 | cmm_read_barrier_depends(); /* load ltc before content */ | |
| 69 | return ltc->read64(); | |
| 70 | } | |
| 71 | } | |
| 72 | ||
| 9c6bb081 | 73 | #endif /* _UST_CLOCK_H */ |