Re: [Discuss-gnuradio] Message Input port in hierarchical block

[Tim O'Shea]

Hier blocks can connect to internal primitive blocks
They are removed during flattening and never receive a thread context to handle messages in, creating a simple primitive received basic block to handle messages like you have done is the right thing.  If we do add hier block message handling it would likely be some clever wrapper around creating a primitive block underneath which received a thread context like what you have done but with some syntactic sugar.
Tim

On Thu, Jan 28, 2016, 8:36 PM Joe K <address@hidden> wrote:

Kartik,

As far as I am aware, hierarchical blocks cannot process messages.  I ran
into the same issue, because I had a hierarchical block with several child
blocks, and it needed to do some control operations to the child blocks
dependent on a received message, without those blocks "understanding" or
caring about the contents of the message.

My workaround was to create a new variety of block that did nothing but
receive arbitrary messages, and then routed them back up to the hierarchical
block by calling a function in the hierarchical block.  It is kludgey, but
it works.

There are definitely use cases for having message handlers in hierarchical
blocks, but I don't know the underlying code well enough to know if it would
be straightforward to add message handling support to standard hierarchical
blocks.

Joe

-----Original Message-----
Sent: Wednesday, January 27, 2016 10:46 AM
To: address@hidden
Subject: [Discuss-gnuradio] Message Input port in hierarchical block

Hi,

I have a hierarchical block generated via GRC with no input or output
message port.
Now I add a message port by changing python code for some control
functionality using:

        self.message_port_register_hier_in("test")

Now generally in sync or other blocks we can bind this "test" port to a
handler function like:

        self.set_msg_handler(pmt.intern("test"),self.handler)

The problem is that there is no such function for hierarchical blocks in
gr.hier_block2 class
So how can I process message data coming in at this port ?

Please excuse if I have missed something.

Kartik




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