Re: [Discuss-gnuradio] put a block to sleep

[Martin Braun]

On 21.05.2014 11:53, Mostafa Alizadeh wrote:
> Hello everybody,
>
> I want to connect a source to a sink block but there must be a sort of
> synchronization between them. The sink block should ask the source to
> generate data stream on some specific instances. Between these
> instances, the source block must put to the sleep or be disabled. How
> could I do this?
>
> I thought it was possible with exchanging messages between these two
> blocks by which the sink block send a message to the source to disable
> or enable it. But this doesn't work because the scheduler will remain on
> the source after generating only one block of data (I need to generate
> just one block) at the start up of the flowgraph!

If you just need one block, you can use blocks.head.
To "keep your block alive", you can use a heartbeat message: Give your 
block another message port, and use the message strobe to send it 
messages every N ms. Once it's alive, you can figure out if you need 
your source to send more data.

M