On Tue, Dec 20, 2011 at 11:02 AM, Thomas Tsou <tt...@vt.edu> wrote: > On Tue, Dec 20, 2011 at 5:11 AM, Sebastian Döring > <sdoer...@rhrk.uni-kl.de> wrote: > >> > ------------------------------------------------------------------------------------------------------ > >> #0 0x0013a455 in sem_post@@GLIBC_2.1 () from > >> /lib/tls/i686/cmov/libpthread.so.0 > >> #1 0x0810ab61 in PyThread_release_lock (lock=0x0) at > >> ../Python/thread_pthread.h:374 > >> #2 0x080dbad3 in PyEval_ReleaseLock () at ../Python/ceval.c:262 > >> #3 0x00fa6073 in gr_py_feval_dd::calleval(double) () > > This is likely a similar issue with the Python GIL (global interpreter > lock) that occurred previously on the E100. In that case the final > cause was a missing ctypes library. > > > http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2011-June/001479.html > > To find out, try this thread hack. The patch is old, so you will > probably need to apply manually against the current master. > > diff --git a/uhd_spectrum_sense_sum.py b/uhd_spectrum_sense_sum.py > index 70f530f..31bf458 100644 > --- a/uhd_spectrum_sense_sum.py > +++ b/uhd_spectrum_sense_sum.py > @@ -32,7 +32,11 @@ import sys > import math > import struct > import time > +import threading > > +class ThreadClass(threading.Thread): > + def run(self): > + return > > class tune(gr.feval_dd): > """ > @@ -306,6 +310,9 @@ def main_loop(tb): > > > if __name__ == '__main__': > + t = ThreadClass() > + t.start() > + > tb = my_top_block() > try: > tb.start() # start executing flow graph in > another thread... > > Thomas
Please let us know if this patch works. I think this has been an outstanding issue in GNU Radio for a while. It'd be good to get a fix for it in. Thanks, Tom
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