On 7 October 2014 15:58, Jed Brown <[email protected]> wrote:
>
> "Garth N. Wells" <[email protected]> writes:
> > I thought the issue we're discussing is that the above Python pattern,
> > which is the natural way to do things, can break in parallel because of
> > non-deterministic garbage collection and that we need an alternative?
>
> The with statement (PEP 343) provides __exit__, which is deterministic.
> That pattern is idiomatic and correct. Relying on garbage collection
> when a variable falls out of scope is the problem.
Exactly. This includes the three patterns which are everywhere in dolfin
tests and demos:
File(...) << u
def f():
file = File(...)
file << u
def g():
file = File(...)
file << u
del file
(And as Jed said I was of course wrong about RAII providing exception
safety in the MPI context).
Martin
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