[Discuss-gnuradio] using signals in flowgraphs

[Steve Mcmahon]

Hello:

I have a USRP2 + WBX running with GNU Radio 3.3.0 on openSUSE 11.2.

In my flowgraph, I am trying to create a timer that will call a function 
periodically, say every 200ms. This function would dynamically change some 
parameters of my flowgraph, such as the frequency or amplitude of a Signal 
Source.

I setup a timer using signals (SIGALRM) in my flowgraph, and the code runs, but 
my signal handler never seems to be called, and my tone's frequency and 
amplitude never change. Can you use signals inside a flowgraph? Should I not be 
using signals to do this? Should I use a separate thread instead?

Thanks for your help.

Steve McMahon