StopWatchLinux.h
4.37 KB
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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
/**
* Copyright 1993-2015 NVIDIA Corporation. All rights reserved.
*
* Please refer to the NVIDIA end user license agreement (EULA) associated
* with this source code for terms and conditions that govern your use of
* this software. Any use, reproduction, disclosure, or distribution of
* this software and related documentation outside the terms of the EULA
* is strictly prohibited.
*
*/
#ifndef NV_NPP_UTIL_STOP_WATCH_LINUX_H
#define NV_NPP_UTIL_STOP_WATCH_LINUX_H
// includes, system
#include <ctime>
#include <sys/time.h>
namespace npp
{
/// Windows specific implementation of StopWatch
class StopWatchLinux
{
protected:
//! Constructor, default
StopWatchLinux();
// Destructor
~StopWatchLinux();
public:
//! Start time measurement
inline void start();
//! Stop time measurement
inline void stop();
//! Reset time counters to zero
inline void reset();
//! Time in msec. after start. If the stop watch is still running (i.e. there
//! was no call to stop()) then the elapsed time is returned, otherwise the
//! time between the last start() and stop call is returned
inline const double elapsed() const;
private:
// helper functions
//! Get difference between start time and current time
inline double getDiffTime() const;
private:
// member variables
//! Start of measurement
struct timeval start_time;
//! Time difference between the last start and stop
double diff_time;
//! TOTAL time difference between starts and stops
double total_time;
//! flag if the stop watch is running
bool running;
};
// functions, inlined
////////////////////////////////////////////////////////////////////////////////
//! Start time measurement
////////////////////////////////////////////////////////////////////////////////
inline void
StopWatchLinux::start()
{
gettimeofday(&start_time, 0);
running = true;
}
////////////////////////////////////////////////////////////////////////////////
//! Stop time measurement and increment add to the current diff_time summation
//! variable. Also increment the number of times this clock has been run.
////////////////////////////////////////////////////////////////////////////////
inline void
StopWatchLinux::stop()
{
diff_time = getDiffTime();
total_time += diff_time;
running = false;
}
////////////////////////////////////////////////////////////////////////////////
//! Reset the timer to 0. Does not change the timer running state but does
//! recapture this point in time as the current start time if it is running.
////////////////////////////////////////////////////////////////////////////////
inline void
StopWatchLinux::reset()
{
diff_time = 0;
total_time = 0;
if (running)
{
gettimeofday(&start_time, 0);
}
}
////////////////////////////////////////////////////////////////////////////////
//! Time in msec. after start. If the stop watch is still running (i.e. there
//! was no call to stop()) then the elapsed time is returned added to the
//! current diff_time sum, otherwise the current summed time difference alone
//! is returned.
////////////////////////////////////////////////////////////////////////////////
inline const double
StopWatchLinux::elapsed() const
{
// Return the TOTAL time to date
double retval = total_time;
if (running)
{
retval += getDiffTime();
}
return retval;
}
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
inline double
StopWatchLinux::getDiffTime() const
{
struct timeval t_time;
gettimeofday(&t_time, 0);
// time difference in milli-seconds
return (1000.0 * (t_time.tv_sec - start_time.tv_sec)
+ (0.001 * (t_time.tv_usec - start_time.tv_usec)));
}
} // npp namespace
#endif // NV_NPP_UTIL_STOP_WATCH_LINUX_H