53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
#pragma once
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#define HZ 100
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/*
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* Have the 32 bit jiffies value wrap 5 minutes after boot
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* so jiffies wrap bugs show up earlier.
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*/
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//#define INITIAL_JIFFIES ((unsigned long)(unsigned int) (-300*HZ))
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#define INITIAL_JIFFIES 0
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extern unsigned long volatile jiffies;
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#define time_after(unknown, known) ((long)(known) - (long)(unknown) < 0)
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#define time_before(unknown, known) ((long)(unknown) - (long)(known) < 0)
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#define time_after_eq(unknown, known) ((long)(unknown) - (long)(known) >= 0)
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#define time_before_eq(unknown, known) ((long)(known) - (long)(unknown) >= 0)
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/*
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* Calculate whether a is in the range of [b, c].
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*/
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#define time_in_range(a,b,c) \
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(time_after_eq(a,b) && \
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time_before_eq(a,c))
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/*
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* Calculate whether a is in the range of [b, c).
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*/
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#define time_in_range_open(a,b,c) \
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(time_after_eq(a,b) && \
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time_before(a,c))
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/*
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* These four macros compare jiffies and 'a' for convenience.
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*/
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/* time_is_before_jiffies(a) return true if a is before jiffies */
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#define time_is_before_jiffies(a) time_after(jiffies, a)
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/* time_is_after_jiffies(a) return true if a is after jiffies */
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#define time_is_after_jiffies(a) time_before(jiffies, a)
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/* time_is_before_eq_jiffies(a) return true if a is before or equal to jiffies*/
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#define time_is_before_eq_jiffies(a) time_after_eq(jiffies, a)
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/* time_is_after_eq_jiffies(a) return true if a is after or equal to jiffies*/
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#define time_is_after_eq_jiffies(a) time_before_eq(jiffies, a)
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unsigned int jiffies_to_msecs(const unsigned long j);
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unsigned int jiffies_to_usecs(const unsigned long j);
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unsigned long msecs_to_jiffies(const unsigned int m);
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unsigned long usecs_to_jiffies(const unsigned int u);
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