1#include <time.h>
2#include <sys/time.h>
3
4#include "fio.h"
5
6static struct timeval genesis;
7static unsigned long ns_granularity;
8
9/*
10 * busy looping version for the last few usec
11 */
12void usec_spin(unsigned int usec)
13{
14	struct timeval start;
15
16	fio_gettime(&start, NULL);
17	while (utime_since_now(&start) < usec)
18		nop;
19}
20
21void usec_sleep(struct thread_data *td, unsigned long usec)
22{
23	struct timespec req;
24	struct timeval tv;
25
26	do {
27		unsigned long ts = usec;
28
29		if (usec < ns_granularity) {
30			usec_spin(usec);
31			break;
32		}
33
34		ts = usec - ns_granularity;
35
36		if (ts >= 1000000) {
37			req.tv_sec = ts / 1000000;
38			ts -= 1000000 * req.tv_sec;
39		} else
40			req.tv_sec = 0;
41
42		req.tv_nsec = ts * 1000;
43		fio_gettime(&tv, NULL);
44
45		if (nanosleep(&req, NULL) < 0)
46			break;
47
48		ts = utime_since_now(&tv);
49		if (ts >= usec)
50			break;
51
52		usec -= ts;
53	} while (!td->terminate);
54}
55
56uint64_t mtime_since_genesis(void)
57{
58	return mtime_since_now(&genesis);
59}
60
61uint64_t utime_since_genesis(void)
62{
63	return utime_since_now(&genesis);
64}
65
66int in_ramp_time(struct thread_data *td)
67{
68	return td->o.ramp_time && !td->ramp_time_over;
69}
70
71int ramp_time_over(struct thread_data *td)
72{
73	struct timeval tv;
74
75	if (!td->o.ramp_time || td->ramp_time_over)
76		return 1;
77
78	fio_gettime(&tv, NULL);
79	if (utime_since(&td->epoch, &tv) >= td->o.ramp_time) {
80		td->ramp_time_over = 1;
81		reset_all_stats(td);
82		td_set_runstate(td, TD_RAMP);
83		return 1;
84	}
85
86	return 0;
87}
88
89void fio_time_init(void)
90{
91	int i;
92
93	fio_clock_init();
94
95	/*
96	 * Check the granularity of the nanosleep function
97	 */
98	for (i = 0; i < 10; i++) {
99		struct timeval tv;
100		struct timespec ts;
101		unsigned long elapsed;
102
103		fio_gettime(&tv, NULL);
104		ts.tv_sec = 0;
105		ts.tv_nsec = 1000;
106
107		nanosleep(&ts, NULL);
108		elapsed = utime_since_now(&tv);
109
110		if (elapsed > ns_granularity)
111			ns_granularity = elapsed;
112	}
113}
114
115void set_genesis_time(void)
116{
117	fio_gettime(&genesis, NULL);
118}
119
120void fill_start_time(struct timeval *t)
121{
122	memcpy(t, &genesis, sizeof(genesis));
123}
124