Subversion Repositories shark

#ifndef _LINUX_JIFFIES_H

#define _LINUX_JIFFIES_H

#include <linux/kernel.h>

#include <linux/types.h>

#include <linux/spinlock.h>

#include <linux/seqlock.h>

#include <asm/system.h>

#include <asm/param.h>                  /* for HZ */

/*

 * The 64-bit value is not volatile - you MUST NOT read it

 * without holding read_lock_irq(&xtime_lock).

 * get_jiffies_64() will do this for you as appropriate.

 */

extern u64 jiffies_64;

extern unsigned long volatile jiffies;

#if (BITS_PER_LONG < 64)

u64 get_jiffies_64(void);

#else

static inline u64 get_jiffies_64(void)

{

        return (u64)jiffies;

}

#endif

/*

 *      These inlines deal with timer wrapping correctly. You are

 *      strongly encouraged to use them

 *      1. Because people otherwise forget

 *      2. Because if the timer wrap changes in future you won't have to

 *         alter your driver code.

 *

 * time_after(a,b) returns true if the time a is after time b.

 *

 * Do this with "<0" and ">=0" to only test the sign of the result. A

 * good compiler would generate better code (and a really good compiler

 * wouldn't care). Gcc is currently neither.

 */

#define time_after(a,b)         \

        (typecheck(unsigned long, a) && \

         typecheck(unsigned long, b) && \

         ((long)(b) - (long)(a) < 0))

#define time_before(a,b)        time_after(b,a)

#define time_after_eq(a,b)      \

        (typecheck(unsigned long, a) && \

         typecheck(unsigned long, b) && \

         ((long)(a) - (long)(b) >= 0))

#define time_before_eq(a,b)     time_after_eq(b,a)

#endif