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Date: Tue, 15 Jul 2014 13:32:08 -0700
From: Charles Hixson <charleshixsn@earthlink.net>
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To: Python <python-list@python.org>
Subject: multiprocessing problem:  queue.get() not finding pushed values
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I don't think I can reduce it much beyond this.  I'm trying to run 
Sqlite in a separate process, but I'm running into problems.
*The code:*
from collections    import    namedtuple
from multiprocessing import Process, Queue, current_process
from queue import Empty, Full


Msg    =    namedtuple ("Msg", ['act', 'id', 'vals'])
DBW_to    =    Queue()
DBW_from    =    Queue()

class DBW (Process):
     def __init__ (self, qin, qout):
         self.qin    =    qin
         self.qout    =    qout
         super (DBW, self).__init__()

     def run (self):
         msg    =    self.qin.get(True, 3)
         print ("msg = {0}".format(repr(msg) ) )

if __name__ == "__main__":
     dbw    =    DBW(DBW_to, DBW_from)
     dbw.run()
     DBW_to.put(Msg("a", 1, wrd) )
     DBW_to.put(Msg("b", 2, wrd) )
     DBW_to.put(Msg("c", 0, None) )

*The result:*
Traceback (most recent call last):
   File "test7a.py", line 23, in <module>
     dbw.run()
   File "test7a.py", line 18, in run
     msg    =    self.qin.get(True, 3)
   File "/usr/lib/python3.4/multiprocessing/queues.py", line 107, in get
     raise Empty
queue.Empty

*$ python3 --version*
Python 3.4.1

*The system:*
Linux 3.14-1-amd64



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    I don't think I can reduce it much beyond this.&nbsp; I'm trying to run
    Sqlite in a separate process, but I'm running into problems.<br>
    <b>The code:</b><br>
    from collections&nbsp;&nbsp;&nbsp; import&nbsp;&nbsp;&nbsp; namedtuple<br>
    from multiprocessing import Process, Queue, current_process<br>
    from queue import Empty, Full<br>
    <br>
    <br>
    Msg&nbsp;&nbsp;&nbsp; =&nbsp;&nbsp;&nbsp; namedtuple ("Msg", ['act', 'id', 'vals'])<br>
    DBW_to&nbsp;&nbsp;&nbsp; =&nbsp;&nbsp;&nbsp; Queue()<br>
    DBW_from&nbsp;&nbsp;&nbsp; =&nbsp;&nbsp;&nbsp; Queue()<br>
    <br>
    class DBW (Process):<br>
    &nbsp;&nbsp;&nbsp; def __init__ (self, qin, qout):<br>
    &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; self.qin&nbsp;&nbsp;&nbsp; =&nbsp;&nbsp;&nbsp; qin<br>
    &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; self.qout&nbsp;&nbsp;&nbsp; =&nbsp;&nbsp;&nbsp; qout<br>
    &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; super (DBW, self).__init__()<br>
    <br>
    &nbsp;&nbsp;&nbsp; def run (self):<br>
    &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; msg&nbsp;&nbsp;&nbsp; =&nbsp;&nbsp;&nbsp; self.qin.get(True, 3)<br>
    &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; print ("msg = {0}".format(repr(msg) ) )<br>
    <br>
    if __name__ == "__main__":<br>
    &nbsp;&nbsp;&nbsp; dbw&nbsp;&nbsp;&nbsp; =&nbsp;&nbsp;&nbsp; DBW(DBW_to, DBW_from)<br>
    &nbsp;&nbsp;&nbsp; dbw.run()<br>
    &nbsp;&nbsp;&nbsp; DBW_to.put(Msg("a", 1, wrd) )<br>
    &nbsp;&nbsp;&nbsp; DBW_to.put(Msg("b", 2, wrd) )<br>
    &nbsp;&nbsp;&nbsp; DBW_to.put(Msg("c", 0, None) )<br>
    <br>
    <b>The result:</b><br>
    <tt>Traceback (most recent call last):<br>
      &nbsp; File "test7a.py", line 23, in &lt;module&gt;<br>
      &nbsp;&nbsp;&nbsp; dbw.run()<br>
      &nbsp; File "test7a.py", line 18, in run<br>
      &nbsp;&nbsp;&nbsp; msg&nbsp;&nbsp;&nbsp; =&nbsp;&nbsp;&nbsp; self.qin.get(True, 3)<br>
      &nbsp; File "/usr/lib/python3.4/multiprocessing/queues.py", line 107,
      in get<br>
      &nbsp;&nbsp;&nbsp; raise Empty<br>
      queue.Empty</tt><tt><br>
    </tt><br>
    <b>$ python3 --version</b><br>
    Python 3.4.1<br>
    <br>
    <b>The system:</b><br>
    Linux 3.14-1-amd64<br>
    <br>
    <br>
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