On Thu, Apr 5, 2012 at 5:11 AM, frankist <francisco_pais...@hotmail.com> wrote: > > 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.
You shouldn't have to do that. What version of GNU Radio are you using, and are you on a 32-bit platform? This might be related to a bug in the disconnect/reconnect calls that was patched recently. You can use the following link as a guide to debugging segfaults when they occur: http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#How-do-I-debug-GNU-Radio-in-Python Tom > 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 >> > > -- > View this message in context: > http://old.nabble.com/Debugging-in-gnuradio-tp33557751p33568799.html > Sent from the GnuRadio mailing list archive at Nabble.com. > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
