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

2

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.

edited May 23 '17 at 12:08

Community

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answered Apr 16 '13 at 09:00

0x90

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thanks it worked for me.. – Jeegar Patel Apr 16 '13 at 11:21

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