Bugs item #1722344, was opened at 2007-05-21 00:24
Message generated for change (Comment added) made by thomasda
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Category: Python Interpreter Core
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Yang Zhang (yangzhang)
Assigned to: Nobody/Anonymous (nobody)
Summary: Thread shutdown exception in Thread.notify()
Initial Comment:
Hi, I sometimes see the following exceptions when shutting down my app (using
Python 2.5.1):
Unhandled exception in thread started by
Error in sys.excepthook:
Original exception was:
Exception in thread Thread-3 (most likely raised during interpreter shutdown):
Traceback (most recent call last):
File "/usr/local/lib/python2.5/threading.py", line 460, in __bootstrap
File "/usr/local/lib/python2.5/threading.py", line 440, in run
File "/home/yang/local/armed/lib/python2.5/site-packages/afx/threads.py",
line 71, in worker
File "/usr/local/lib/python2.5/Queue.py", line 176, in get
File "/usr/local/lib/python2.5/threading.py", line 248, in notify
<type 'exceptions.TypeError'>: exceptions must be classes, instances, or
strings (deprecated), not NoneType
Unhandled exception in thread started by
Error in sys.excepthook:
Original exception was:
Exception in thread Thread-6 (most likely raised during interpreter shutdown):
Traceback (most recent call last):
File "/usr/local/lib/python2.5/threading.py", line 460, in __bootstrap
File "/usr/local/lib/python2.5/threading.py", line 440, in run
File "/home/yang/local/armed/lib/python2.5/site-packages/afx/threads.py",
line 71, in worker
File "/usr/local/lib/python2.5/Queue.py", line 176, in get
File "/usr/local/lib/python2.5/threading.py", line 248, in notify
<type 'exceptions.TypeError'>: exceptions must be classes, instances, or
strings (deprecated), not NoneType
Unhandled exception in thread started by
Error in sys.excepthook:
Original exception was:
Here is the code from my application:
def worker():
debug( 'starting worker' )
while True:
msg = i.get() # <-- THIS IS LINE 71
if msg is stop_msg: break
resultbuf, func, args, kwargs = msg
result, exc = None, None
try:
result = func( *args, **kwargs )
except:
t, v, tb = exc_info()
exc = t, v, tb.tb_next
o.put( ( resultbuf, result, exc ) )
s.send( 'x' ) # assuming socket.send is thread-safe
debug( 'stopping worker' )
Here is the origin of the exception (in threading.py):
def notify(self, n=1):
assert self._is_owned(), "notify() of un-acquire()d lock" # <-- THIS IS
LINE 248
__waiters = self.__waiters
waiters = __waiters[:n]
if not waiters:
if __debug__:
self._note("%s.notify(): no waiters", self)
return
self._note("%s.notify(): notifying %d waiter%s", self, n,
n!=1 and "s" or "")
for waiter in waiters:
waiter.release()
try:
__waiters.remove(waiter)
except ValueError:
pass
I'm not sure why this is happening. The threads are not daemon threads; I
terminate them cleanly. When I get a SIGINT (I usu. shut down my app with
ctrl-C), I enqueue n stop_msg's to the 'i' Queue so that the n workers can all
exit.
Note I usually launch 5 workers, so I'm not consistently getting an exception
per worker. Also, I've been unable to reproduce this at will.
----------------------------------------------------------------------
Comment By: Thomas Dybdahl Ahle (thomasda)
Date: 2007-06-06 15:32
Message:
Logged In: YES
user_id=1304417
Originator: NO
I'm getting the same kind of errors.
I'm using a lot of threads, and one of them throws this thread nearly
everytime I close my program (by gtk.main_quit)
It seems that python sets every variable to None, and then wakeup sleeping
threads, which then crash, as they try to work with the None variables
Exception in thread Thread-3 (most likely raised during interpreter
shutdown):
Traceback (most recent call last):
File "/usr/lib/python2.4/threading.py", line 442, in __bootstrap
File
"/home/thomas/Programmering/python/skak/0.7/lib/pychess/System/ThreadPool.py",
line 49, in run
File "/usr/lib/python2.4/Queue.py", line 89, in put
File "/usr/lib/python2.4/threading.py", line 237, in notify
exceptions.TypeError: exceptions must be classes, instances, or strings
(deprecated), not NoneType
Unhandled exception in thread started by
Error in sys.excepthook
----------------------------------------------------------------------
Comment By: Yang Zhang (yangzhang)
Date: 2007-05-21 16:47
Message:
Logged In: YES
user_id=1207658
Originator: YES
No, as they are not daemon threads.
----------------------------------------------------------------------
Comment By: Gabriel Genellina (gagenellina)
Date: 2007-05-21 14:01
Message:
Logged In: YES
user_id=479790
Originator: NO
Do you join() the worker threads, waiting until they finish, before
exiting the main thread?
----------------------------------------------------------------------
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1722344&group_id=5470
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