1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "statsreport/common/highres_timer.h"
const uint64 MICROS_IN_MILLI = 1000L;
const uint64 MICROS_IN_HALF_MILLI = 500L;
const uint64 MICROS_IN_HALF_SECOND = 500000L;
uint64 HighresTimer::GetElapsedMs() const {
uint64 end_time = GetCurrentTicks();
// Scale to ms and round to nearest ms - rounding is important
// because otherwise the truncation error may accumulate e.g. in sums.
//
return (static_cast<uint64>(end_time - start_ticks_) +
MICROS_IN_HALF_MILLI) /
MICROS_IN_MILLI;
}
uint64 HighresTimer::GetElapsedSec() const {
uint64 end_time = GetCurrentTicks();
// Scale to ms and round to nearest ms - rounding is important
// because otherwise the truncation error may accumulate e.g. in sums.
//
return (static_cast<uint64>(end_time - start_ticks_) +
MICROS_IN_HALF_SECOND) /
MICROS_IN_SECOND;
}
|
