New submission from David Naylor <[EMAIL PROTECTED]>:
Overview:
Add a generator that will revert the order applied to a with
statement.
Motivation:
Often with threaded applications one needs to do a certain task
outside of a lock but while inside a greater block of code protected
by a lock.
e.g:
with lock:
BLOCK1
lock.release()
try:
BLOCK2
finally:
lock.acquire()
BLOCK3
but with an inverter for a with statement it becomes:
with lock:
BLOCK1
with invert(lock):
BLOCK2
BLOCK3
[Of course there are many other possible uses for this...]
Implementation:
def invert(thing):
thing.__exit__(None, None, None)
yield thing
thing.__enter__()
Issues:
Normal exception handling will not take place (however for locks and
the like this is not an issue)
----------
components: Library (Lib)
messages: 73715
nosy: DragonSA
severity: normal
status: open
title: [contextlib] Reverse order of locking
type: feature request
versions: Python 2.6, Python 3.0
_______________________________________
Python tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue3957>
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