how to run while loop for some millisecond in linux kernel?

Question

i need to do some polling in Linux kernel for continues some time so i need to design while loop that exits after some milliseconds interval. So how can i do that?

I have though to use gettimeofday() but that can be used at user space i want this in kernel space.

this is not duplicate question...that question talk for userspace and i am about kernel space...that was for getting accurate time here i am interested in running while loop for some time — Jeegar Patel, Apr 16 '13 at 10:07

score 2 · Accepted Answer · edited May 23 '17 at 12:08

use msecs_to_jiffies :

unsigned long j0,j1,delay;
delay = msecs_to_jiffies(20); /* 20 msec delay */
j0 = jiffies; 
j1 = j0 + delay; 

while (time_before(jiffies, j1)) 
        /* do something */

If you have high resolution timers on your system, you can use it for times in magnitude smaller than one jiffy. Generally consider using kernel timers or hrt.

score -3 · Answer 2 · edited Apr 16 '13 at 09:23

-3

You can use the sleep function, like sleep(1): it will stop the activity for 1 sec.

edited Apr 16 '13 at 09:23

Schnouki

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answered Apr 16 '13 at 08:58

umang2203

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Seconds are not milliseconds. – Lundin Apr 16 '13 at 11:33

how to run while loop for some millisecond in linux kernel?

2 Answers2