[Discuss-gnuradio] Bypass work function

 I have following flowgraph:

usrp_source--->>probe_mag_squared_block---->block2--->block3

What I want to do is that I want to bypass the "work" function of block2 when the threshold level of probe_mag_squared reaches. I do not want to stop(), lock(), disconnect the flow graph. Is this possible using stream tags, or message passing etc ? Any example code would be nice.

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Bob