Re: [Discuss-gnuradio] About closing flowgraph automatically

[Marcus Müller]

Hi,

'doh.

Which leaves one to wonder why the finished state never gets checked.
I'll be back after a bit of tracing.

Cheers,

Marcus


On 24.07.2016 08:04, Sylvain Munaut wrote:
> 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