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comparison future.c @ 81:be814b934eca

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Implement gettimeofday()
author Daniele Nicolodi <daniele.nicolodi@obspm.fr>
date Mon, 18 Mar 2013 12:36:34 +0100
parents 9d57d1fcbcd5
children 4102fe614df2
comparison
equal deleted inserted replaced
80:46fe62febcd0 81:be814b934eca
1 /* welcome in the 2012 */ 1 /* welcome in the 2012 */
2 2
3 /* required by CVI */ 3 /* required by CVI */
4 #include <ansi_c.h> 4 #include <ansi_c.h>
5
6 /* time functions */
7 #include <windows.h>
8
9 #include "future.h"
10
5 11
6 /* an implementation of the C99 `round` function based on `floor` and `ceil` */ 12 /* an implementation of the C99 `round` function based on `floor` and `ceil` */
7 double round(double x) 13 double round(double x)
8 { 14 {
9 if (x >= 0.0) { 15 if (x >= 0.0) {
16 if (x - y >= 0.5) 22 if (x - y >= 0.5)
17 y -= 1.0; 23 y -= 1.0;
18 return y; 24 return y;
19 } 25 }
20 } 26 }
27
28
29 /* implement high resolution time service */
30 int gettimeofday(struct timeval *tp, struct timezone *tzp)
31 {
32 /* difference between 1970-01-01 and 1601-01-01
33 in 100-nanoseconds intervals */
34 const unsigned __int64 shift = 116444736000000000ULL;
35 union {
36 FILETIME ft;
37 unsigned __int64 integer; /* 100-nanoseconds since 1601-01-01 */
38 } now;
39
40 /* retrive system time in UTC. the resolution is limited to the resolution
41 of the system timer, which is typically in the range of 10 milliseconds
42 to 16 milliseconds */
43 GetSystemTimeAsFileTime(&now.ft);
44
45 /* shift to epoch and truncate to microseconds */
46 now.integer = (now.integer - shift) / 10LL;
47
48 tp->tv_usec = (long)(now.integer % 1000000LL);
49 tp->tv_sec = (long)(now.integer / 1000000LL);
50
51 /* FIXME CVI redefines the epoch as seconds since 1900-01-01 ! */
52 tp->tv_sec += 2208988800;
53
54 return 0;
55 }
56
57
58 static struct tm * copy_tm_result(struct tm *dest, struct tm const *src)
59 {
60 if (! src)
61 return NULL;
62 *dest = *src;
63 return dest;
64 }
65
66
67 struct tm * gmtime_r(time_t const *t, struct tm *tp)
68 {
69 return copy_tm_result(tp, gmtime(t));
70 }
71