$ python tbp.py
each test group is testing 10000 items
sem_init: Resource temporarily unavailable
Exception in thread Thread-3:
Traceback (most recent call last):
  File "/tmp/python.572/usr/lib/python2.4/threading.py", line 442, in __bootstra
p
    self.run()
  File "/tmp/python.572/usr/lib/python2.4/threading.py", line 422, in run
    self.__target(*self.__args, **self.__kwargs)
  File "tbp.py", line 16, in reader
    msg = Q.get()
  File "/tmp/python.572/usr/lib/python2.4/Queue.py", line 119, in get
    self.not_empty.wait()
  File "/tmp/python.572/usr/lib/python2.4/threading.py", line 197, in wait
    waiter = _allocate_lock()
error: can't allocate lock

sem_init: Resource temporarily unavailable
Exception in thread Thread-6:
Traceback (most recent call last):
  File "/tmp/python.572/usr/lib/python2.4/threading.py", line 442, in __bootstra
p
    self.run()
  File "/tmp/python.572/usr/lib/python2.4/threading.py", line 422, in run
    self.__target(*self.__args, **self.__kwargs)
  File "tbp.py", line 16, in reader
    msg = Q.get()
  File "/tmp/python.572/usr/lib/python2.4/Queue.py", line 119, in get
    self.not_empty.wait()
  File "/tmp/python.572/usr/lib/python2.4/threading.py", line 197, in wait
    waiter = _allocate_lock()
error: can't allocate lock