In kernel i want compare jiffies with millisecond. Can we do like this with 5 ms in if statement? Can you help me?
jiffies>5
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Jiffies, as you probably know, are a measurement of time. Jiffies are usually about 4ms if you are using the UNIX timer that I usually user (forget its name, it's been awhile). So your comparison (if I'm reading your question right...) would be if (jiffies > 1), really. – PinkElephantsOnParade Jan 10 '13 at 19:02
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i want compare exact time. – user1967799 Jan 10 '13 at 19:32
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From include/linux/jiffies.h:
extern unsigned int jiffies_to_msecs(const unsigned long j);
If it's there for your kernel, convert jiffies to milliseconds and compare as you want:
#include <linux/jiffies.h>
...
... if (jiffies_to_msecs(jiffies)>5u) ....
Anton Kovalenko
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Use constant `HZ`, as described in this question: http://stackoverflow.com/questions/2731463/converting-jiffies-to-milli-seconds – Anton Kovalenko Jan 10 '13 at 19:34