blob: 1b6b6bc5d4e2af76d69deb77b2d42d3596613ffd (
plain)
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
|
#include "project.h"
#define SLEEP_MIN 100000
#define THRESH 1000
void sync_to_second (struct timeval *ret)
{
struct timeval tv1, tv2;
ret->tv_usec = 0;
for (;;) {
tv2.tv_sec = 0;
gettimeofday (&tv1, NULL);
tv2.tv_usec = 1000000 - tv1.tv_usec;
if (tv1.tv_usec < THRESH) {
ret->tv_sec = tv1.tv_sec;
return;
} else if (tv2.tv_usec < THRESH) {
ret->tv_sec = tv1.tv_sec + 1;
return;
}
if (tv2.tv_usec > SLEEP_MIN)
select (0, NULL, NULL, NULL, &tv2);
else
usleep (tv2.tv_usec / 2);
}
}
void sync_to_minute (struct timeval *ret)
{
struct timeval tv1, tv2;
ret->tv_usec = 0;
for (;;) {
tv2.tv_sec = 0;
gettimeofday (&tv1, NULL);
tv2.tv_sec = 60 - (tv1.tv_sec % 60);
tv2.tv_usec = 1000;
printf ("%d seconds left in min\n", (int) tv2.tv_sec);
if (tv2.tv_sec > 1) {
tv2.tv_sec /= 2;
select (0, NULL, NULL, NULL, &tv2);
} else {
sync_to_second (ret);
return;
}
}
}
|