array that's larger than 50% of the available RAM.

Patch by Médéric Boquien.

robust at shutdown. If needs to release multiple resources, they are released
even if errors are occured.

Patch by Davin Potts.

handle exceptions raised by an iterator.  Patch by Alon Diamant and Davin
Potts.

This is to keep buildbots running while we figure out the best long-term fix.

Followup to issue #20540; patch by Serhiy.

class name instead of hardcoded one.

primitives.

Issue #20540: Fix a performance regression (vs. Python 3.2) when layering a multiprocessing Connection over a TCP socket.
For small payloads, Nagle's algorithm would introduce idle delays before the entire transmission of a message.

- handles main files without a suffix
- handles main submodules properly
- adds test cases for the various kinds of __main__

by multiprocessing.spawn (before it was raising an AttributeError).

module supports digestmod names, e.g. hmac.HMAC('sha1').

This allows different parts of a program to use different methods for
starting processes without interfering with each other.

to avoid one extra FD per Connection.

are now created non-inheritable; add functions os.get/set_inheritable(),
os.get/set_handle_inheritable() and socket.socket.get/set_inheritable().

Also modify test code to hopefully avoid deadlock on failure.

See http://hg.python.org/sandbox/sbt#spawn