What is the best way to change settings such as gain, taps, frequency values, etc of various blocks while running? The current setup I'm refactoring receives new configs over tcp, and a block outputs the new config values to probe signals, and those probe signals are used to change various settings. In the case of setting some usrp source parameters (center frequency), it appears to not properly work, so for the usrp sink and sources, I am going to pass messages to change the parameters. This isn't possible for other blocks, though, as they do not have message inputs.
If I should stick with the current method, though, I'm really curious how there is mutual exclusion, as the values are being changed while the flowgraph is running. I have looked at the source code for some of the blocks I'm using, and I don't see any mutexes. This makes me think this isn't the best way to do what is being done.
Thanks,