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
|
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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; either version 2 of the License, or
(at your option) any later version.
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 */
#ifdef __NETWARE__
#include <nks/time.h>
#endif
#include "mysys_priv.h"
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(__WIN__)
#define OFFSET_TO_EPOC ((__int64) 134774 * 24 * 60 * 60 * 1000 * 1000 * 10)
static __int64 offset=0, freq;
LARGE_INTEGER t_cnt;
if (!offset)
{
/* strictly speaking there should be a mutex to protect
initialization section. But my_getsystime() is called from
UUID() code, and UUID() calls are serialized with a mutex anyway
*/
LARGE_INTEGER li;
FILETIME ft;
GetSystemTimeAsFileTime(&ft);
li.LowPart=ft.dwLowDateTime;
li.HighPart=ft.dwHighDateTime;
offset=li.QuadPart-OFFSET_TO_EPOC;
QueryPerformanceFrequency(&li);
freq=li.QuadPart;
QueryPerformanceCounter(&t_cnt);
offset-=t_cnt.QuadPart/freq*10000000+t_cnt.QuadPart%freq*10000000/freq;
}
QueryPerformanceCounter(&t_cnt);
return t_cnt.QuadPart/freq*10000000+t_cnt.QuadPart%freq*10000000/freq+offset;
#elif defined(__NETWARE__)
NXTime_t tm;
NXGetTime(NX_SINCE_1970, NX_NSECONDS, &tm);
return (ulonglong)tm/100;
#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
}
|
