blob: a682537f812e52e1aa806f6c19d41f11414d34ec (
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
55
56
57
58
59
|
#ifndef _LINUX_TIMES_H
#define _LINUX_TIMES_H
#ifdef __KERNEL__
#include <asm/div64.h>
#include <asm/types.h>
#include <asm/param.h>
#if (HZ % USER_HZ)==0
# define jiffies_to_clock_t(x) ((x) / (HZ / USER_HZ))
#else
# define jiffies_to_clock_t(x) ((clock_t) jiffies_64_to_clock_t((u64) x))
#endif
static inline unsigned long clock_t_to_jiffies(unsigned long x)
{
#if (HZ % USER_HZ)==0
if (x >= ~0UL / (HZ / USER_HZ))
return ~0UL;
return x * (HZ / USER_HZ);
#else
u64 jif;
/* Don't worry about loss of precision here .. */
if (x >= ~0UL / HZ * USER_HZ)
return ~0UL;
/* .. but do try to contain it here */
jif = x * (u64) HZ;
do_div(jif, USER_HZ);
return jif;
#endif
}
static inline u64 jiffies_64_to_clock_t(u64 x)
{
#if (HZ % USER_HZ)==0
do_div(x, HZ / USER_HZ);
#else
/*
* There are better ways that don't overflow early,
* but even this doesn't overflow in hundreds of years
* in 64 bits, so..
*/
x *= USER_HZ;
do_div(x, HZ);
#endif
return x;
}
#endif
struct tms {
clock_t tms_utime;
clock_t tms_stime;
clock_t tms_cutime;
clock_t tms_cstime;
};
#endif
|
