[Patches] [ python-Patches-1314396 ] ensure lock is released if exception is raised

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Patches item #1314396, was opened at 2005-10-05 19:18
Message generated for change (Comment added) made by bcannon
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Category: Library (Lib)
Group: None
>Status: Closed
>Resolution: Accepted
Priority: 5
Submitted By: Eric Blossom (eblossom)
>Assigned to: Brett Cannon (bcannon)
Summary: ensure lock is released if exception is raised

Initial Comment:
If an exception (typically KeyboardInterrupt) is raised
in Thread.join, self.__block will be left locked, and
any later attempt to join will block forever.  The bug
is easy to trigger if you provide a timeout to join. 
This patch ensures that the lock is released.

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>Comment By: Brett Cannon (bcannon)
Date: 2005-11-22 18:22

Message:
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user_id=357491

rev. 41524 (2.5) and rev. 41525 (2.4) have the fix.  I am
really looking forward to the 'with' statement and having
all of the locks in 'threading' support it.  Then this kind
of thing will be avoided.

Also, so it is documented, to trigger this, do the following::

import threading
import time

th = threading.Thread(target=lambda: time.sleep(5.0))
th.start()
th.join('blah')
th.join  # Used to hang

Thanks, Eric (tacked you on to Misc/ACKS).

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