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75d9ab4b MD |
1 | #ifndef _BABELTRACE_CLOCK_INTERNAL_H |
2 | #define _BABELTRACE_CLOCK_INTERNAL_H | |
3 | ||
4 | /* | |
5 | * BabelTrace | |
6 | * | |
7 | * clocks header (internal) | |
8 | * | |
9 | * Copyright 2012 EfficiOS Inc. and Linux Foundation | |
10 | * | |
11 | * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
12 | * Julien Desfossez <julien.desfossez@efficios.com> | |
13 | * | |
14 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
15 | * of this software and associated documentation files (the "Software"), to deal | |
16 | * in the Software without restriction, including without limitation the rights | |
17 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
18 | * copies of the Software, and to permit persons to whom the Software is | |
19 | * furnished to do so, subject to the following conditions: | |
20 | * | |
21 | * The above copyright notice and this permission notice shall be included in | |
22 | * all copies or substantial portions of the Software. | |
c462e188 MD |
23 | * |
24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
25 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
26 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
27 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
28 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
29 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
75d9ab4b MD |
31 | */ |
32 | ||
33 | static inline | |
34 | uint64_t clock_cycles_to_ns(struct ctf_clock *clock, uint64_t cycles) | |
35 | { | |
36 | if (clock->freq == 1000000000ULL) { | |
37 | /* 1GHZ freq, no need to scale cycles value */ | |
38 | return cycles; | |
39 | } else { | |
40 | return (double) cycles * 1000000000.0 | |
41 | / (double) clock->freq; | |
42 | } | |
43 | } | |
44 | ||
c64b7943 MD |
45 | /* |
46 | * Note: if using a frequency different from 1GHz for clock->offset, it | |
47 | * is recommended to express the seconds in offset_s, otherwise there | |
48 | * will be a loss of precision caused by the limited size of the double | |
49 | * mantissa. | |
61cf588b | 50 | * This offset can be negative. |
c64b7943 MD |
51 | */ |
52 | static inline | |
61cf588b | 53 | int64_t clock_offset_ns(struct ctf_clock *clock) |
c64b7943 MD |
54 | { |
55 | return clock->offset_s * 1000000000ULL | |
56 | + clock_cycles_to_ns(clock, clock->offset); | |
57 | } | |
58 | ||
75d9ab4b | 59 | #endif /* _BABELTRACE_CLOCK_INTERNAL_H */ |