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
|
/* Copyright (C) 2004 MySQL AB
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 */
/*
TODO: in functions my_micro_time() and my_micro_time_and_time() there
exists some common code that should be merged into a function.
*/
#include "mysys/mysys_priv.h"
#include "my_static.h"
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
uint64_t my_getsystime()
{
#ifdef HAVE_CLOCK_GETTIME
struct timespec tp;
clock_gettime(CLOCK_REALTIME, &tp);
return (uint64_t)tp.tv_sec*10000000+(uint64_t)tp.tv_nsec/100;
#else
/* TODO: check for other possibilities for hi-res timestamping */
struct timeval tv;
gettimeofday(&tv,NULL);
return (uint64_t)tv.tv_sec*10000000+(uint64_t)tv.tv_usec*10;
#endif
}
/*
Return time in micro seconds
SYNOPSIS
my_micro_time()
NOTES
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.
For windows platforms we need the frequency value of the CUP. This is
initalized in my_init.c through QueryPerformanceFrequency().
If Windows platform doesn't support QueryPerformanceFrequency() we will
obtain the time via GetClockCount, which only supports milliseconds.
RETURN
Value in microseconds from some undefined point in time
*/
uint64_t my_micro_time()
{
#if defined(HAVE_GETHRTIME)
return gethrtime()/1000;
#else
uint64_t newtime;
struct timeval t;
/*
The following loop is here because gettimeofday may fail on some systems
*/
while (gettimeofday(&t, NULL) != 0)
{}
newtime= (uint64_t)t.tv_sec * 1000000 + t.tv_usec;
return newtime;
#endif /* defined(HAVE_GETHRTIME) */
}
/*
Return time in seconds and timer in microseconds (not different start!)
SYNOPSIS
my_micro_time_and_time()
time_arg Will be set to seconds since epoch (00:00:00 UTC,
January 1, 1970)
NOTES
This function is to be useful when we need both the time and microtime.
For example in MySQL this is used to get the query time start of a query
and to measure the time of a query (for the slow query log)
IMPLEMENTATION
Value of time is as in time() call.
Value of microtime is same as my_micro_time(), which may be totally
unrealated to time()
RETURN
Value in microseconds from some undefined point in time
*/
uint64_t my_micro_time_and_time(time_t *time_arg)
{
uint64_t newtime;
struct timeval t;
/*
The following loop is here because gettimeofday may fail on some systems
*/
while (gettimeofday(&t, NULL) != 0) {}
*time_arg= t.tv_sec;
newtime= (uint64_t)t.tv_sec * 1000000 + t.tv_usec;
return newtime;
}
|