The temporary fix suggested elsewhere with substituting lock() with stop() followed by wait() and unlock() with start() was tested and works fine!!!
For now this is sufficient for what I want to do, although the stop/wait/start method works only on the entire top_block and not on individual (hier2) blocks as the lock/unlock (is supposed to) work thanks everyone for the help, Achilleas On Fri, Oct 4, 2013 at 6:45 PM, Achilleas Anastasopoulos <anas...@umich.edu>wrote: > I have uploaded a bare minimum example that still has this problem: > > sinusoid--> throtle --> (ON or OFF block) --> null sink > > http://web.eecs.umich.edu/~anastas/docs/onoff_flat_test1.py > > And here is all the output of gdb (it segfaults in unlock() ): > > > > (gdb) backtrace > #0 0x00007ffff00b80a0 in volk_32fc_s32fc_multiply_32fc_a_sse3 () > from /usr/local/lib64/libvolk.so.0.0.0 > #1 0x00007ffff083910a in gr::blocks::multiply_const_cc_impl::work(int, > std::vector<void const*, std::allocator<void const*> >&, std::vector<void*, > std::allocator<void*> >&) () > from /usr/local/lib64/libgnuradio-blocks-3.7.2git.so.0.0.0 > #2 0x00007ffff0401fc7 in gr::sync_block::general_work(int, > std::vector<int, std::allocator<int> >&, std::vector<void const*, > std::allocator<void const*> >&, std::vector<void*, std::allocator<void*> > >&) () from /usr/local/lib64/libgnuradio-runtime-3.7.2git.so.0.0.0 > #3 0x00007ffff03caca8 in gr::block_executor::run_one_iteration() () > from /usr/local/lib64/libgnuradio-runtime-3.7.2git.so.0.0.0 > #4 0x00007ffff0410ee6 in > gr::tpb_thread_body::tpb_thread_body(boost::shared_ptr<gr::block>, int) () > from /usr/local/lib64/libgnuradio-runtime-3.7.2git.so.0.0.0 > #5 0x00007ffff03ff38e in gr::tpb_container::operator()() () > from /usr/local/lib64/libgnuradio-runtime-3.7.2git.so.0.0.0 > #6 0x00007ffff03ff58e in > gr::thread::thread_body_wrapper<gr::tpb_container>::operator()() > () from /usr/local/lib64/libgnuradio-runtime-3.7.2git.so.0.0.0 > #7 0x00007ffff03b320f in > boost::detail::thread_data<boost::function0<void> >::run() () > from /usr/local/lib64/libgnuradio-runtime-3.7.2git.so.0.0.0 > #8 0x0000003349a11629 in thread_proxy () from > /lib64/libboost_thread-mt.so.1.50.0 > #9 0x0000003340a07d15 in start_thread () from /lib64/libpthread.so.0 > #10 0x000000333fef253d in clone () from /lib64/libc.so.6 > > > > > > > > > On Fri, Oct 4, 2013 at 6:00 PM, Marcus Müller <mar...@hostalia.de> wrote: > >> Hi Achilleas, >> >> after skimming through your code, I found no obvious mistakes so far. >> My guess was that under some circumstances, you connect or disconnect a >> connection twice or something similarly wicked happens, but I can't see >> why that should happen. >> Can you supply us with a backtrace, generated by GDB? >> (gdb --args python onoff_flat_test.py; then type "run<return>" as soon >> as gdb is ready, then type "backtrace<return>" after the program >> segfaulted) >> >> Greetings >> Marcus >> On Fri, 2013-10-04 at 17:46 -0400, Achilleas Anastasopoulos wrote: >> > >> > >> > I have a pyhton program (see >> > http://web.eecs.umich.edu/~anastas/docs/onoff_flat_test.py) >> > that based on a button chooser (on/off) rearranges itself. >> > I use lock/unlock to do the disconnection/reconnection. >> > However, I always get segfaults after a couple of changes. >> > >> > >> > The graph is pretty simple: >> > >> > >> > A complex sinusodial source + noise (throttled) goes to either: >> > >> > >> > ON) multiplication by 2 and complex to mag squared >> > >> > or >> > >> > OFF) multiplication by 0 and complex to mag squared >> > >> > >> > and then to a null sink. >> > >> > >> > >> > I would really appreciate some input because I am kind of lost as to >> > what >> > >> > is going wrong. >> > >> > thanks in advance, >> > Achilleas >> > >> > >> > _______________________________________________ >> > Discuss-gnuradio mailing list >> > Discuss-gnuradio@gnu.org >> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >> >
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