I know you fixed the deadlock problem, but the warnings about shutdown misbehaviour are still valid.
-- Sent from my phone, thus the relative brevity :) On May 18, 2012 9:59 PM, "antoine.pitrou" <python-check...@python.org> wrote: > http://hg.python.org/cpython/rev/565734c9b66d > changeset: 77020:565734c9b66d > parent: 77018:364289cc7891 > user: Antoine Pitrou <solip...@pitrou.net> > date: Fri May 18 13:57:04 2012 +0200 > summary: > Remove outdated statements about threading and imports. > > files: > Doc/library/multiprocessing.rst | 4 +-- > Doc/library/threading.rst | 23 --------------------- > 2 files changed, 1 insertions(+), 26 deletions(-) > > > diff --git a/Doc/library/multiprocessing.rst > b/Doc/library/multiprocessing.rst > --- a/Doc/library/multiprocessing.rst > +++ b/Doc/library/multiprocessing.rst > @@ -120,9 +120,7 @@ > print(q.get()) # prints "[42, None, 'hello']" > p.join() > > - Queues are thread and process safe, but note that they must never > - be instantiated as a side effect of importing a module: this can lead > - to a deadlock! (see :ref:`threaded-imports`) > + Queues are thread and process safe. > > **Pipes** > > diff --git a/Doc/library/threading.rst b/Doc/library/threading.rst > --- a/Doc/library/threading.rst > +++ b/Doc/library/threading.rst > @@ -996,27 +996,3 @@ > Currently, :class:`Lock`, :class:`RLock`, :class:`Condition`, > :class:`Semaphore`, and :class:`BoundedSemaphore` objects may be used as > :keyword:`with` statement context managers. > - > - > -.. _threaded-imports: > - > -Importing in threaded code > --------------------------- > - > -While the import machinery is thread-safe, there are two key restrictions > on > -threaded imports due to inherent limitations in the way that > thread-safety is > -provided: > - > -* Firstly, other than in the main module, an import should not have the > - side effect of spawning a new thread and then waiting for that thread in > - any way. Failing to abide by this restriction can lead to a deadlock if > - the spawned thread directly or indirectly attempts to import a module. > -* Secondly, all import attempts must be completed before the interpreter > - starts shutting itself down. This can be most easily achieved by only > - performing imports from non-daemon threads created through the threading > - module. Daemon threads and threads created directly with the thread > - module will require some other form of synchronization to ensure they do > - not attempt imports after system shutdown has commenced. Failure to > - abide by this restriction will lead to intermittent exceptions and > - crashes during interpreter shutdown (as the late imports attempt to > - access machinery which is no longer in a valid state). > > -- > Repository URL: http://hg.python.org/cpython > > _______________________________________________ > Python-checkins mailing list > python-check...@python.org > http://mail.python.org/mailman/listinfo/python-checkins > >
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