[Discuss-gnuradio] Can't stop the top_block which contain transmit_path with GNU Radio version 11001

[Ling Huang]

sorry for attaching this again. 
I use UBUNTU 9.04 + gnuradio 11001 and UBUNTU 8.10 +gnuradio 10853 got the
same problem.

I modify the gnuradio-examples/python/digital codes for some experiences. In
one case I want to stop the running flow graph(top block), and then to start
a new connect. I do it well in stop the receive_path connect. But I just
can't stop the top block contain a transmit_path. If I stop the top block,
and wait, it hang in the tb.wait. 
I seem not express well. To make it simple let's see: 
class my_topblock(gr.top_block) 
    def __init__(self): 
         self.trans=transmit_path(...) 
         self.connect(self.trans) 
.... 

tb.start() 
tb.stop() 
tb.wait() # IT HANG IN HERE 
... 
tb.start() 

I made a simple test code to test stopping the top block , please test it to
see what's the problem. 

ps.Eric, 
would you please tell me what cause tb.wait() hanging, where is this bug
from? 
I have install the newest version of GNU Radio, but the problem is still the
same. 

-------------------------------code--------------------------------------------------------
 
#!/usr/bin/env python 

from gnuradio import gr, gru, modulation_utils 
from gnuradio import eng_notation 
from gnuradio.eng_option import eng_option 
from optparse import OptionParser 
import random, time, struct, sys 

# from current dir 
from transmit_path import transmit_path 
import fusb_options 

class my_top_block(gr.top_block): 

    def __init__(self,mod_class,options): 
        gr.top_block.__init__(self) 
        self.txpath = transmit_path(mod_class, options) 
        self.connect(self.txpath); 

def main(): 
    mods = modulation_utils.type_1_mods() 
    parser = OptionParser(option_class=eng_option,
conflict_handler="resolve") 
    expert_grp = parser.add_option_group("Expert") 
    parser.add_option("-m", "--modulation", type="choice",
choices=mods.keys(), 
                      default='gmsk', 
                      help="Select modulation from: %s [default=%%default]"%
(', '.join(mods.keys()),))   
    transmit_path.add_options(parser, expert_grp) 
    for mod in mods.values(): 
        mod.add_options(expert_grp) 
    r = gr.enable_realtime_scheduling() 
    fusb_options.add_options(expert_grp) 
    (options, args) = parser.parse_args () 

    tb=my_top_block(mods[options.modulation], options) 
  
    tb.start() 
    tb.stop() 
    print "afater stop" 
    tb.wait() 
    print "wait done" 
    tb.start() 
    print "start again" 
    
if __name__ == '__main__': 
    try: 
        main() 
    except KeyboardInterrupt: 
        pass 
    
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