[Discuss-gnuradio] How to repeatedly & continously transmit a signal from a file ?

[Rickard Radio]

Hi 

- How is it possible to transmit a file (as a signal source) repeatedly and 
continously without interrupts (with gnuradio & uhd) ??
 
Even without the USRP (i.e. just simulating with throttle & graphical sinks and 
a file source) interrupts occurs (time-periods of no samples) for each time the 
file repeats (i.e. starts over from the beginning). Same thing with 
transmitting with USRP as uhd-source (then without throttling of course), 
however no underruns are reported. 

I want to continuously send a prepared signal from a file over and over again 
but can't accept the interrupts each time the file ends & starts over. This 
happens even at slow sample rates and I want to transmit really fast!

I might have found a solution to this about year ago but now I can't remember 
what I did… something simple...
Somehow read in the whole file into cached memory so it doesn't need to be 
re-read from disk for each repetition (in Linux)… but how?  

Rickard