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
|
// Copyright (c) 2006-2018 Maxim Khizhinsky
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef CDSLIB_OS_LINUX_TIMER_H
#define CDSLIB_OS_LINUX_TIMER_H
#ifndef CDSLIB_OS_TIMER_H
# error "<cds/os/timer.h> must be included"
#endif
#include <time.h>
//#include <sys/time.h>
//@cond none
namespace cds { namespace OS {
inline namespace Linux {
// High resolution timer
class Timer {
public:
typedef struct timespec native_timer_type;
typedef long long native_duration_type;
private:
native_timer_type m_tmStart;
public:
Timer() { current( m_tmStart ) ; }
static void current( native_timer_type& tmr )
{
// faster than gettimeofday() and posix
clock_gettime( CLOCK_REALTIME, &tmr );
}
static native_timer_type current()
{
native_timer_type tmr;
current(tmr);
return tmr;
}
double reset()
{
native_timer_type ts;
current( ts );
double dblRet = double( ( ts.tv_sec - m_tmStart.tv_sec ) + ( ts.tv_nsec - m_tmStart.tv_nsec )) / 1.0E9;
m_tmStart = ts;
return dblRet;
}
double duration( native_duration_type dur )
{
return double( dur ) / 1.0E9;
}
double duration()
{
return duration( native_duration());
}
native_duration_type native_duration()
{
native_timer_type ts;
current( ts );
return native_duration( m_tmStart, ts );
}
static native_duration_type native_duration( const native_timer_type& nStart, const native_timer_type& nEnd )
{
return native_duration_type( nEnd.tv_sec - nStart.tv_sec ) * 1000000000 + ( nEnd.tv_nsec - nStart.tv_nsec);
}
static unsigned long long random_seed()
{
native_timer_type tmr;
current( tmr );
return ( ((unsigned long long)(tmr.tv_sec)) << 32 ) + tmr.tv_nsec;
}
};
} // namespace Linux
}} // namespace cds::OS
//@endcond
#endif // #ifndef CDSLIB_OS_LINUX_TIMER_H
|
