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) 2004, 2014, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
/* get time since epoc in 100 nanosec units */
/* thus to get the current time we should use the system function
with the highest possible resolution */
#include "mysys_priv.h"
#include "my_static.h"
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
/**
Get high-resolution time.
@remark For windows platforms we need the frequency value of
the CPU. This is initialized in my_init.c through
QueryPerformanceFrequency(). If the Windows platform
doesn't support QueryPerformanceFrequency(), zero is
returned.
@retval current high-resolution time.
*/
ulonglong my_getsystime()
{
#ifdef HAVE_CLOCK_GETTIME
struct timespec tp;
clock_gettime(CLOCK_REALTIME, &tp);
return (ulonglong)tp.tv_sec*10000000+(ulonglong)tp.tv_nsec/100;
#elif defined(_WIN32)
LARGE_INTEGER t_cnt;
if (query_performance_frequency)
{
QueryPerformanceCounter(&t_cnt);
return ((t_cnt.QuadPart / query_performance_frequency * 10000000) +
((t_cnt.QuadPart % query_performance_frequency) * 10000000 /
query_performance_frequency) + query_performance_offset);
}
return 0;
#else
/* TODO: check for other possibilities for hi-res timestamping */
struct timeval tv;
gettimeofday(&tv,NULL);
return (ulonglong)tv.tv_sec*10000000+(ulonglong)tv.tv_usec*10;
#endif
}
/**
Return current time.
@param flags If MY_WME is set, write error if time call fails.
@retval current time.
*/
time_t my_time(myf flags)
{
time_t t;
/*
The following loop is here beacuse time() may fail on some systems.
We're using a hardcoded my_message_stderr() here rather than going
through the hook in my_message_local() because it's far too easy to
come full circle with any logging function that writes timestamps ...
*/
while ((t= time(0)) == (time_t) -1)
{
if (flags & MY_WME)
my_message_stderr(0, "time() call failed", MYF(0));
}
return t;
}
#define OFFSET_TO_EPOCH 116444736000000000ULL
/**
Return time in microseconds.
@remark This function is to be used to measure performance in
micro seconds. As it's not defined whats the start time
for the clock, this function us only useful to measure
time between two moments.
@retval Value in microseconds from some undefined point in time.
*/
ulonglong my_micro_time()
{
#ifdef _WIN32
ulonglong newtime;
GetSystemTimeAsFileTime((FILETIME*)&newtime);
newtime-= OFFSET_TO_EPOCH;
return (newtime/10);
#else
ulonglong newtime;
struct timeval t;
/*
The following loop is here because gettimeofday may fail on some systems
*/
while (gettimeofday(&t, NULL) != 0)
{}
newtime= (ulonglong)t.tv_sec * 1000000 + t.tv_usec;
return newtime;
#endif
}
|
