blob: ff08c3d5c75111f797fcf24c18cf6f5cd8221ac6 (
plain)
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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/* Copyright (c) 2014-2015, Stanislaw Halik <sthalik@misaki.pl>
* Permission to use, copy, modify, and/or distribute this
* software for any purpose with or without fee is hereby granted,
* provided that the above copyright notice and this permission
* notice appear in all copies.
*/
#include "ndebug-guard.hpp"
#include <cassert>
#include "timer.hpp"
#include <cmath>
Timer::Timer()
{
start();
}
void Timer::start()
{
gettime(&state);
}
// common
void Timer::gettime(timespec* state)
{
#if defined(_WIN32) || defined(__MACH__)
otr_clock_gettime(state);
#elif defined CLOCK_MONOTONIC
const int res = clock_gettime(CLOCK_MONOTONIC, state);
assert(res == 0 && "must support CLOCK_MONOTONIC");
#else
# error "timer query method not known"
#endif
}
// nanoseconds
long long Timer::elapsed_nsecs() const
{
timespec cur{};
gettime(&cur);
return conv_nsecs(cur);
}
long long Timer::conv_nsecs(const timespec& cur) const
{
return (cur.tv_sec - state.tv_sec) * 1000000000LL + (cur.tv_nsec - state.tv_nsec);
}
// microseconds
double Timer::elapsed_usecs() const
{
timespec cur{};
gettime(&cur);
const long long nsecs = conv_nsecs(cur);
return nsecs * 1e-3;
}
// milliseconds
double Timer::elapsed_ms() const
{
return elapsed_usecs() / 1000.;
}
double Timer::elapsed_seconds() const
{
return double(elapsed_nsecs() * 1e-9L);
}
// --
// platform-specific code starts here
// --
#if defined _WIN32
LARGE_INTEGER Timer::otr_get_clock_frequency()
{
LARGE_INTEGER freq{};
(void) QueryPerformanceFrequency(&freq);
return freq;
}
void Timer::otr_clock_gettime(timespec* ts)
{
static const LARGE_INTEGER freq = otr_get_clock_frequency();
LARGE_INTEGER d;
(void) QueryPerformanceCounter(&d);
using ll = long long;
const ll part = ll(std::roundl((d.QuadPart * 1000000000.L) / ll(freq.QuadPart)));
using t_s = decltype(ts->tv_sec);
using t_ns = decltype(ts->tv_nsec);
ts->tv_sec = t_s(part / 1000000000);
ts->tv_nsec = t_ns(part % 1000000000);
}
#elif defined __MACH__
mach_timebase_info_data_t Timer::otr_get_mach_frequency()
{
mach_timebase_info_data_t timebase_info;
(void) mach_timebase_info(&timebase_info);
return timebase_info;
}
void Timer::otr_clock_gettime(timespec* ts)
{
static const mach_timebase_info_data_t timebase_info = otr_get_mach_frequency();
uint64_t state, nsec;
state = mach_absolute_time();
nsec = state * timebase_info.numer / timebase_info.denom;
ts->tv_sec = nsec / 1000000000L;
ts->tv_nsec = nsec % 1000000000L;
}
#endif
|
