Locking and try/finally

[Geoffrey Talvola]

xtian at toysinabag.com [mailto:xtian at toysinabag.com] wrote:
...
> Obtaining locks is simpler in C++ than in Python. The equivalent
> Python code is always 3 lines longer. In fact, about 9% of the Python
> implementation of Recall is simply obtaining and releasing locks
> safely. Yet, overall, the Python code is smaller.
...

Instead of writing:

	mutex.acquire()
	try:
		# do something
	finally:
		mutex.release()

How about wrapping up the try/finally and acquire/release into a method of
the mutex object that takes a callable as its argument:

	def task():
		# do something
	mutex.call(task)

This saves 2 lines, as long as the "do something" part can be placed into a
nested function (which isn't always possible, but often is, using nested
scopes).

- Geoff