1 #ifndef _BABELTRACE_CLOCK_INTERNAL_H
2 #define _BABELTRACE_CLOCK_INTERNAL_H
7 * clocks header (internal)
9 * Copyright 2012 EfficiOS Inc. and Linux Foundation
11 * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
12 * Julien Desfossez <julien.desfossez@efficios.com>
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:
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
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
34 uint64_t clock_cycles_to_ns(struct ctf_clock
*clock
, uint64_t cycles
)
36 if (clock
->freq
== 1000000000ULL) {
37 /* 1GHZ freq, no need to scale cycles value */
40 return (double) cycles
* 1000000000.0
41 / (double) clock
->freq
;
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
50 * This offset can be negative.
53 int64_t clock_offset_ns(struct ctf_clock
*clock
)
55 return clock
->offset_s
* 1000000000ULL
56 + clock_cycles_to_ns(clock
, clock
->offset
);
59 #endif /* _BABELTRACE_CLOCK_INTERNAL_H */
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