My user space process contains 2 threads:

First thread is blocked upon a kernel event created by a hardware interrupt handled by the kernel.

The  thread is sending ioctl which is blocked till this interrupt occurs.  

Second thread has just a 5msec sleep. It does something and then sleeps for 5msec. Forever. 

Is it possible to see when each thread is running (and not blocked or sleeps) ?

I know how to do it with user events. I wonder if it's possible without any extra code. 

Thank you,

Zvika