gtkmm Monitoring IO example

[Sanne Ausma <sanne sanneausma nl>]

I am trying the Gtkmm Monitoring I/O example from the gtkmm-tutorial.
(https://developer.gnome.org/gtkmm-tutorial/unstable/sec-monitoring-io.html.en)

The example works but after something has been written to the fifo, top 
shows the CPU load going to 100%.
I have tried the example with both gtkmm 3.0 and 2.4 but the result is 
the same.

Is this normal behaviour?

Thanks,

Sanne