Prepare Stacklss 3.5

[ghost]

Originally reported by: Anselm Kruis (Bitbucket: akruis, GitHub: akruis)

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Python 3.5 adds a few new features, which affect Stackless. Here are the results of a quick and dirty review of What’s New In Python 3.5:

1. https://bugs.python.org/issue21205: New generator attribute __qualname__. PyGenObject gets two new members: gi_name and gi_qualname.

   Pickling support implemented: a8f3bfa783a9

2. https://bugs.python.org/issue19235: new RecursionError exception

3. https://bugs.python.org/issue24400: PEP 492 - Coroutines with async and await syntax

   As part of the PEP 492 implementation, the tp_reserved slot of PyTypeObject was replaced with a tp_as_async slot. Refer to Coroutine Objects for new types, structures and functions.

   The coroutine type is just a variant of the generator type. Therefore it is possible to reuse the pickling code for generators to enable pickling of coroutines. Implemented with commit e2bf67837ac2.

4. Argument Clinic

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• Bitbucket: https://bitbucket.org/stackless-dev/stackless/issue/112

[ghost]

Original comment by Anselm Kruis (Bitbucket: akruis, GitHub: akruis):

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Now that #113 is resolved, the Python test suite runs without crashes. A few tests fail:

374 tests OK.
6 tests failed:
    test_doctest test_httplib test_pickle test_pickletools test_ssl
    test_urllibnet
2 tests altered the execution environment:
    test_distutils test_warnings
10 tests skipped:
    test_devpoll test_kqueue test_msilib test_ossaudiodev
    test_startfile test_tk test_ttk_guionly test_winreg test_winsound
    test_zipfile64

Of theses the failures in test_httplib, test_ssl and test_urllibnet were likely caused by my network setup.

test_doctest will be fixed by c9f1630cf2b1 (http://bugs.python.org/issue9951).

test_pickle test_pickletools are Stackless related. They test, that CPython can't pickle a local function. Stackless however pickles such functions by value. I disabled (skip) the test. Changeset c9371dc8e69a

[ghost]

Original comment by Anselm Kruis (Bitbucket: akruis, GitHub: akruis):

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Points 2 and 3 are not yet implemented in our current default-slp. I'm going to merge the changes in branch default up to commit 0d0989359bbb. This is the last ancestor of branch 3.5 on branch default.

[ghost]

Original comment by Anselm Kruis (Bitbucket: akruis, GitHub: akruis):

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I branched 3.5-slp and I'm approaching v3.5.0. Currently all tests seem to pass.

I had to patch (commit bda8a9d487da) the C-Python test runner (http://bugs.python.org/issue30028) because the rule "Stackless kills tasklets with C-state upon shutdown" seems to affect multiprocessing is a subtle way. Obviously forked child processes now run their cleanup code. Bug or feature?

[ghost]

Original comment by Anselm Kruis (Bitbucket: akruis, GitHub: akruis):

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Here it is: 0ac1f7fae298 could become Stackless 3.5.3.

@ctismer and @krisvale: could you please test the latest 3.5-slp version.

[ghost]

Original comment by Anselm Kruis (Bitbucket: akruis, GitHub: akruis):

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I also tried to enable recursion free execution of coroutines and "yield from". Unfortunately it turned out to be very very complicated and I didn't succeed within a reasonable amount of time. Because this feature is not required for existing applications, I declare Stackless 3.5 feature complete.

[akruis]

A very last step: adapt the msi installer. Since Python 3.5 a new Wix based installer is used. Fortunately it is not too hard to adapt the installer.

[akruis]

Installers for Windows v3.5.4 are available for download on stackless.com. I can't build macOS installers.