Re: [Discuss-gnuradio] About closing flowgraph automatically

[Sylvain Munaut]

Hi,

>  52     int pdu_to_tagged_stream_impl::calculate_output_stream_length(const 
> gr_vector_int &)
>  53     {
>  54       if (d_curr_len == 0) {
>  55           /* FIXME: This blocking call is far from ideal but is the best 
> we
>  56            *        can do at the moment
>  57            */
>  58         pmt::pmt_t msg(delete_head_blocking(PDU_PORT_ID, 100));
>  59         if (msg.get() == NULL) {
>  60           return 0;
>  61         }

[snip]

> Problem is that if we use the non-blocking call here, the scheduler would 
> have a chance to process the shutdown signal, but it would be constantly 
> asking (spinning) for the output stream length.
>
> You could try out what would happen if we'd added a timeout to the blocking 
> cal; that way, you could reduce the spinning, and hopefully get the scheduler 
> to check for "done" messages.

There _is_ a timeout ... that "100" in there is the # of millisec to
wait at most.


Cheers,

   Sylvain