Re: [Discuss-gnuradio] Block Thread question

[Marcus Müller]

Hi Jake,

yes, that's true: The block_executer practically goes through an endless loop between handling input samples with (general_)work and handling messages with the registered message handler. The whole point of that is that you can send a message that would (logically) change something in the operation of the block, and it will never interfere with the operation of work – thread-safety! (imagine, for example, you changed the number of taps of a FIR filter right in the middle of that filter's operation – that would definitely lead to some unexpected results).

Best regards,

Marcus

On 10/04/2016 08:09 AM, Gavin Jacobs wrote:

I am writing a block which takes a PDU input and produces a stream output. I used a source block template with zero stream inputs, one message input, and one stream output. I have implemented a message handler and I can see my messages are being received. I need to pass data from the PDU message handler to work(). I looked at the code for PDU_to_tagged_stream and it appears that they use a private member (d_curr_len) to communicate from the message handler to work - which implies that the message handler and work are on the same thread. Is this correct? i.e. can I use a plain FIFO queue from message handler to work, or do I need a thread safe queue?

Thanks,

Jake

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