[Discuss-gnuradio] Freeze when writing to linux fifo pipe

[Joachim Roop]

Hi,
I am trying to write to a linux pipe/fifo, but sadly this seems to freeze 
python. I am using Ubuntu 10.04 and gnuradio 3.2.2.dfsg-1ubuntu1.
Please try to execute the code and tell me why this makes the app pause.

#! /usr/bin/python

# Import stuff
from gnuradio import gr, gru, eng_notation, optfir
from gnuradio.eng_option import eng_option
from gnuradio.wxgui import slider, powermate
from gnuradio.wxgui import stdgui2, fftsink2, form, scopesink2
import sys
import os

# Main application
class main_app (stdgui2.std_top_block):
        def __init__(self,frame,panel,vbox,argv):
                stdgui2.std_top_block.__init__ (self,frame,panel,vbox,argv)

                print '!!!Cleanup'
                os.spawnlp(os.P_WAIT, 'rm', 'rm','/tmp/gnutest1.raw')
                os.spawnlp(os.P_WAIT, 'rm', 'rm','/tmp/gnutest2.raw')
                print '!!!make a fifo'
                os.spawnlp(os.P_WAIT, 'mkfifo', 'mkfifo','/tmp/gnutest1.raw')
                print '!!!make file sink without the fifo'
                outok = gr.file_sink(gr.sizeof_short,'/tmp/gnutest2.raw')
                print '!!!make file sink with the fifo (FREEZING)'
                outcrash = gr.file_sink(gr.sizeof_short, '/tmp/gnutest1.raw')
                print '!!!everything went better than expected'

if __name__ == '__main__':
    app = stdgui2.stdapp (main_app, "crashtest")
    app.MainLoop ()
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