repeat a function after fixed time period

[sounak chakraborty]

dear sir 
i want to call my own function inside the kernel 
after a fixed interval(i.e some kind of timer)
how to do that which function i have to use to 
repeat the function


anather way is that making my own system call 
which calls my function and 
this sytem call is being access by a user program
which calls it after a fixed inter val of time
 will this be correct
thanks 
sounak

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