Re: [Discuss-gnuradio] Flowgraph locking up with Stream Mux

[Jeon]

Oh I didnt know it.

Thanks for correcting it

Regards
Jeon

2015. 7. 9. 오전 11:51에 "Nowlan, Sean" <address@hidden>님이 작성:

Null source just sets all outputs to zero, so it’s equivalent to a constant source with the scalar=0.

 

…

      for(size_t n = 0; n < input_items.size(); n++) {

        optr = (void*)output_items[n];

        memset(optr, 0, noutput_items * output_signature()->sizeof_stream_item(n));

      }

…

 

I think this is some subtle issue with Stream Mux’s forecast function and how it interacts with the scheduler knowing when to advance read pointers from the upstream block. This is just a wild guess, though. Also, I’ve seen an upstream block connect to two inputs of a Multiply block to create a squaring device, and that seems to work just fine. But in Stream Mux’s case, it’s only copying from one input at a time.

 

Sean

 

From: discuss-gnuradio-bounces+sean.nowlan=address@hidden [mailto:discuss-gnuradio-bounces+sean.nowlan=address@hidden] On Behalf Of Jeon
Sent: Wednesday, July 08, 2015 10:46 PM
To: Discuss GNU Radio mailing list
Subject: Re: [Discuss-gnuradio] Flowgraph locking up with Stream Mux

 

whileni didnt look into null source block code,

but the basic behavior of null source block is,

it outputs nothing.

So stream mux waits until input blocks pass a given number of samples and it takes forever

Regards
Jeon

2015. 7. 9. 오전 11:27에 "Nowlan, Sean" <address@hidden>님이 작성:

I’m somehow getting a simple flowgraph to lock up GNU Radio. It locks up every time I run it, after roughly the same amount of time. As you can see in the attached image and GRC file, I’m feeding two inputs of a Stream Mux block from the same upstream block. Do you imagine why that might cause problems?

 

I know there are other ways to do what I’ve shown here, but locking up seems like a bug.

 

Thanks,

Sean

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