Based on patch by Rafik Draoui.

* Inline internal_select() function
* Rename internal_select_ex() internal_select()

or nested classes) now are supported with pickle protocols < 4.

Tests by Jessica McKellar.

Fixed ambigious reverse mappings.  Added many new mappings.  Import mapping
is no longer applied to modules already mapped with full name mapping.

Added tests for compatible pickling and unpickling and for consistency of
_compat_pickle mappings.

Fixed ambigious reverse mappings.  Added many new mappings.  Import mapping
is no longer applied to modules already mapped with full name mapping.

Added tests for compatible pickling and unpickling and for consistency of
_compat_pickle mappings.

Selector.select() is now retried with the recomputed timeout when interrupted
by a signal.

Write an unit test with a signal handler raising an exception, and a unit with
a signal handler which does not raise an exception (it does nothing).

signal handler does not raise an exception

Retry:

* signal.sigtimedwait()
* threading.Lock.acquire()
* threading.RLock.acquire()
* time.sleep()

timeout when interrupted by a signal, except if the signal handler raises an
exception. This change is part of the PEP 475.

The asyncore and selectors module doesn't catch the InterruptedError exception
anymore when calling select.select(), since this function should not raise
InterruptedError anymore.

The previous patch only dealt with KeyboardInterrupt when all of the
data had been consumed by the pager.  This deals with the interrupt
when some data is still pending.

Thanks Ben Hoyt for the report.

getentropy() is used (OpenBSD 5.6+).

(OpenBSD 5.6+).

implementation is used.

using the C volatile keyword.

Add _Py_fstat_noraise() function when a Python exception is not welcome.

MemoryError.