# Are there any Gnuradio Events? **URL:** \ **Category:** GNU Radio\ **Created:** [June 2, 2011, 3:54am UTC](https://www.ruby-forum.com/t/are-there-any-gnuradio-events/207764 "2011-06-02T03:54:07Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![luislavena](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/0ea827/32.png) [@luislavena](https://www.ruby-forum.com/u/luislavena)\ **Post date:** [June 2, 2011, 3:54am UTC](https://www.ruby-forum.com/t/are-there-any-gnuradio-events/207764/1 "2011-06-02T03:54:07Z")
Lets say you have a GUI app that has a fixed runtime determined by a head block set to (sample\_rate \* n\_seconds). Currently, the gui keeps running. Is there an OnShutdown or some function I can override to catch the flowgraph completion? Worst case, can I set up a loop thread to check tb.is\_running or something to that effect? ---
**Author:** ![Brett\_LSTrotter](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/df788c/32.png) [@Brett\_LSTrotter](https://www.ruby-forum.com/u/Brett_LSTrotter)\ **Post date:** [June 3, 2011, 10:01am UTC](https://www.ruby-forum.com/t/are-there-any-gnuradio-events/207764/2 "2011-06-03T10:01:52Z")
Sure, there’s the upcoming GNU Radio conference 🙂 SCNR… On Wed, Jun 01, 2011 at 01:28:51PM -0500, Brett L. Trotter wrote: > Lets say you have a GUI app that has a fixed runtime determined by a > head block set to (sample\_rate \* n\_seconds). Currently, the gui keeps > running. Is there an OnShutdown or some function I can override to catch > the flowgraph completion? Worst case, can I set up a loop thread to > check tb.is\_running or something to that effect? tb.wait() is a blocking function, so you could use that to create a trigger for your own event. MB – Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin B. Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT – University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association ---
**Author:** ![Brett\_LSTrotter](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/df788c/32.png) [@Brett\_LSTrotter](https://www.ruby-forum.com/u/Brett_LSTrotter)\ **Post date:** [June 6, 2011, 4:58pm UTC](https://www.ruby-forum.com/t/are-there-any-gnuradio-events/207764/3 "2011-06-06T16:58:31Z")
On Fri, Jun 3, 2011 at 3:57 AM, Martin B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > tb.wait() is a blocking function, so you could use that to create a > trigger for your own event. > > MB Yes, there is no event generated that you can look for (unless Eric has sneaked something in there that I haven’t seen or heard of, which is not completely out of the question). I’d take Martin’s advice and have your own watcher thread that waits on the flowgraph completion and then does whatever it is you need it to do. Tom