to its signal handlers.

Use also _Py_write_noraise() instead of write() to retry write() if it is
interrupted by a signal (fail with EINTR).

faulthandler.dump_traceback() also calls PyErr_CheckSignals() to call the
Python signal handler if a signal was received.

and _Py_DumpTracebackThreads(). Document also these functions to explain that
the caller is responsible to call PyErr_CheckSignals().

_posixsubprocess

signalmodule.c

Helper to write() which retries write() if it is interrupted by a signal (fails
with EINTR).

_PyTime_AsMicroseconds() rounding.

Add also unit tests.

MemoryError.

MemoryError.

multiple threads.

multiple threads.

Windows uses WSAEINTR error code, not EINTR, for socket functions.

Patch by Martin Panter.

Call PyErr_CheckSignals() immediatly if connect() or select() fails with EINTR
in internal_connect().

Refactor also the code to limit indentaton and make it more readable.

Call PyErr_CheckSignals() if connect(), select() or getsockopt() failed with
EINTR.

On Windows, it looks like using the C type socklen_t for getsockopt() (instead
of int) is fine, it was already used in socket.getsockopt().

On Windows, internal_connect() now reuses internal_connect_select() and always
calls getsockopt().

The function now returns the error code instead of using the global errno
(POSIX) or WSAGetLastError() (Windows).

internal_connect() now returns errno if getsockopt() fails.

protocols.

Added WindowsError to compatibility mappings.

Added WindowsError to compatibility mappings.

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.