Retrieving OS parameters specific to processes

Hi,

I have to write an application that moniters a particular process, say
notepad.exe, and kill it if its CPU usage is > 90% for 15 sec or more.
The other instances of notepad should not be killed. we should kill
only that process which is consuming the CPU more.

I could not get the CPU usage pertaining to a particular process
id(pid)

suppose: there are 10 instances of notepad.exe, (pid ranging from 220
to 229), and the instance with pid=225 is consuming the maximum CPU, I
have to kill pid 225.

How can I calculate the CPU usage based on PID?

Please help.

Thanks,
Rao,
TCS.

.

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