Re: [Discuss-gnuradio] scratch space in output buffer

If you call set_output_multiple() in your block constructor, it will
guarantee the size of the output buffer. The scheduler won't touch it
until you exit your block with:

return noutput_items;

Ron

On 05/30/2017 12:57 PM, Miklos Maroti wrote:
> Hi,
>
> I would like to use scratch space within the output buffer of a block,
> but not sure if I can rely on the scheduler not altering the content
> of those items in the output buffer that I have written to but have
> not made it available to downstream blocks within general_work. I know
> how blocks, forecast, general_work and history works, but I think my
> use case is not covered.
>
> A simple toy use case would be to implement a fir filter without the
> history call (I know that in this case history is better). Once a new
> sample is taken from the input you multiply that with an N-length
> kernel and add it to the output buffer and output only one item and
> zero out N-item ahead.
>
> Can I rely on the scheduler not to modify unproduced items (but of
> course within the limits of ninput_items)? Should I return 0 for
> forecast when there is not enough space in the output buffer? Would
> such a block be synchronous?
>
> Best,
> Miklos
>
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