Is it possible a GNU Radio distribution problem? In the new lab we installed
the whole GNU Radio again. Thanks.
Yanyan
Eric Blossom wrote:
>
> On Wed, Mar 18, 2009 at 10:36:17PM -0700, yyzhuang wrote:
>>
>> Hi Eric,
>>
>> We read through the code. gr_buffer is a circular/ring buffer, so when
>> reading/writing through it, we need to take modular into account. The
>> assert
>> error, it's line 125 in gr_buffer.h
>> (gnuradio/gnuradio-core/src/lib/runtime/gr_buffer.h):
>>
>> unsigned
>> index_add (unsigned a, unsigned b)
>> {
>> unsigned s = a + b;
>>
>> if (s >= d_bufsize)
>> s -= d_bufsize;
>>
>> assert (s < d_bufsize);
>> return s;
>> }
>>
>> It is invoked by
>>
>> void
>> gr_buffer::update_write_pointer (int nitems)
>> {
>> scoped_lock guard(*mutex());
>> d_write_index = index_add (d_write_index, nitems);
>> }
>>
>> void
>> gr_buffer_reader::update_read_pointer (int nitems)
>> {
>> scoped_lock guard(*mutex());
>> d_read_index = d_buffer->index_add (d_read_index, nitems);
>> }
>>
>> I think it wants to add d_write_index or d_read_index by nitems. But when
>> arrival rate is higher than service rate, buffer overflow occurs. Do you
>> know how to increase the buffer size? Thanks.
>
> The problem is most likely not in this code, but in a gr_block that is
> misbehaving. Increasing the buffer size will not fundamentally alter
> the behavior.
>
> Eric
>
>
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>
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