Re: [Discuss-gnuradio] Debugging in gnuradio

[frankist]

It seems I found the solution, in spite of not knowing the reason.

I just have to re-assign a new block to each block variable every time I
re-connect them. It seems that connecting and disconnecting the same blocks
several times was the cause for the segmentation fault.


frankist wrote:
> 
> Hi,
> 
> I am having a hard time with a "segmentation fault" error. I am no expert
> in python (I just started to use it last week) but I find it difficult to
> believe that a segmentation fault error would appear in python code.
> However, I am not using any block made by me.
> 
> So this is the part of my code where there is an segmentation fault:
> 
> def measure_callback(self,kv):
>               print "Measuring!!"
>               if self.state==SNR_MEASURE:
>                       print "Measuring SNR"
>                       self.lock()
>                       self.disconnect((self.gr_file_source_0, 0),
> (self.gr_throttle_0,0), self.fft_sink)
>                       self.connect((self.gr_file_source_0, 0),
> (self.gr_complex_to_mag_squared_0, 0), (self.gr_moving_average_ff_1, 0),
> (self.gr_multiply_const_ff_0, 0), self.pwr_measure)
>                       self.unlock()
>                       time.sleep(5)
>                       snr_val=10*math.log(self.pwr_measure.level())
>                       print "SNR measured = ", snr_val
>                       self.lock()
>                       self.disconnect((self.gr_file_source_0,
> 0),(self.gr_complex_to_mag_squared_0, 0), (self.gr_moving_average_ff_1,
> 0), (self.gr_multiply_const_ff_0, 0), self.pwr_measure)
>                       self.connect((self.gr_file_source_0, 0), 
> self.gr_throttle_0,
> self.fft_sink)
>                       self.unlock()
> 
> So basically I am reading a signal from a file_source and showing its FFT
> on a graphical interface. Then when there is a callback from a button I
> made, this measure_callback(self,kv) is called and I change my circuit to
> measure SNR.
> 
> I used some prints and discovered that the "segmentation fault" happens at
> "time.sleep(5)". Lol. Furthermore, the error doesn't happen all the times
> I run this code.
> 
> Unfortunately, I don't know any type of debugging programs for gnuradio (I
> don't know if there is one) but it would be very handy because with just a
> "Segmentation Fault" message with no traceback it is difficult to know
> what to do.
> 
> So, any suggestion about what might be causing this problem?
> 
> Francisco
> 

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