Re: [Discuss-gnuradio] Insert messages in queues?

[Martin Braun]

On 12.04.2015 15:22, madengr wrote:
> Thanks Martin.  Looking at the gr-blocks/examples/msg_passing, the tutorial
> link, and qa_msg, I only find examples of posting messages. Those make
> sense, but is there an equivalent to _post method that pulls messages?
>
> http://gnuradio.org/doc/doxygen/classgr_1_1basic__block.html#a8501714cb14c1a08b4ff55761600f3a5
>
>  From the above docs, I see the delete_head_blocking, which is maybe what I
> want.  If I have a tagged stream to PDU like below, how do I pull the
> message?
>
> sink=blocks.tagged_stream_to_pdu(blocks.float_t, "packet_len")
> sink.to_basic_block.???????

So you want pop messages from outside the block, right? Is the original 
block written in C++?

delete_head_block() should work, but this seems unusual. Typically, we 
have two mechanisms of handling messages: Dedicated message handler 
callbacks, or we pop the queue ourselves in work() using delete_head().

If you're popping messages outside of the block, the block itself would 
never see or use those messages -- which is why I'm surprised. You might 
be better of writing a mini-Python-block that handles the messages.

Cheers,
M

> Lou
>
>
> Martin Braun-2 wrote
> > Hey Louis,
> >
> > Yes, there are two ways, and they're completely different. The old
> > message queues will be deprecated soon, so anything with gr.msg_queue()
> > in there will, at one point in the future, stop working.
> >
> > Look at the Python output of some of the message examples we provide,
> > also check out this manual page:
> > http://gnuradio.org/doc/doxygen/page_msg_passing.html
> >
> > M
> >
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