Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef _LINUX_JIFFIES_H |
| 2 | #define _LINUX_JIFFIES_H |
||
| 3 | |||
| 4 | #include <linux/kernel.h> |
||
| 5 | #include <linux/types.h> |
||
| 6 | #include <linux/spinlock.h> |
||
| 7 | #include <linux/seqlock.h> |
||
| 8 | #include <asm/system.h> |
||
| 9 | #include <asm/param.h> /* for HZ */ |
||
| 10 | |||
| 11 | /* |
||
| 12 | * The 64-bit value is not volatile - you MUST NOT read it |
||
| 13 | * without holding read_lock_irq(&xtime_lock). |
||
| 14 | * get_jiffies_64() will do this for you as appropriate. |
||
| 15 | */ |
||
| 16 | extern u64 jiffies_64; |
||
| 17 | extern unsigned long volatile jiffies; |
||
| 18 | |||
| 19 | #if (BITS_PER_LONG < 64) |
||
| 20 | u64 get_jiffies_64(void); |
||
| 21 | #else |
||
| 22 | static inline u64 get_jiffies_64(void) |
||
| 23 | { |
||
| 24 | return (u64)jiffies; |
||
| 25 | } |
||
| 26 | #endif |
||
| 27 | |||
| 28 | /* |
||
| 29 | * These inlines deal with timer wrapping correctly. You are |
||
| 30 | * strongly encouraged to use them |
||
| 31 | * 1. Because people otherwise forget |
||
| 32 | * 2. Because if the timer wrap changes in future you won't have to |
||
| 33 | * alter your driver code. |
||
| 34 | * |
||
| 35 | * time_after(a,b) returns true if the time a is after time b. |
||
| 36 | * |
||
| 37 | * Do this with "<0" and ">=0" to only test the sign of the result. A |
||
| 38 | * good compiler would generate better code (and a really good compiler |
||
| 39 | * wouldn't care). Gcc is currently neither. |
||
| 40 | */ |
||
| 41 | #define time_after(a,b) \ |
||
| 42 | (typecheck(unsigned long, a) && \ |
||
| 43 | typecheck(unsigned long, b) && \ |
||
| 44 | ((long)(b) - (long)(a) < 0)) |
||
| 45 | #define time_before(a,b) time_after(b,a) |
||
| 46 | |||
| 47 | #define time_after_eq(a,b) \ |
||
| 48 | (typecheck(unsigned long, a) && \ |
||
| 49 | typecheck(unsigned long, b) && \ |
||
| 50 | ((long)(a) - (long)(b) >= 0)) |
||
| 51 | #define time_before_eq(a,b) time_after_eq(b,a) |
||
| 52 | |||
| 53 | #endif |