delta/cpython-git.git/Modules/_xxsubinterpretersmodule.c, branch enum-lost-fixes

bpo-43916: Add Py_TPFLAGS_DISALLOW_INSTANTIATION type flag (GH-25721)

2021-04-30T10:46:15+00:00

Add a new Py_TPFLAGS_DISALLOW_INSTANTIATION type flag to disallow
creating type instances: set tp_new to NULL and don't create the
"__new__" key in the type dictionary.

The flag is set automatically on static types if tp_base is NULL or
&PyBaseObject_Type and tp_new is NULL.

Use the flag on the following types:

* _curses.ncurses_version type
* _curses_panel.panel
* _tkinter.Tcl_Obj
* _tkinter.tkapp
* _tkinter.tktimertoken
* _xxsubinterpretersmodule.ChannelID
* sys.flags type
* sys.getwindowsversion() type
* sys.version_info type

Update MyStr example in the C API documentation to use
Py_TPFLAGS_DISALLOW_INSTANTIATION.

Add _PyStructSequence_InitType() function to create a structseq type
with the Py_TPFLAGS_DISALLOW_INSTANTIATION flag set.

type_new() calls _PyType_CheckConsistency() at exit.

bpo-43472: Ensure PyInterpreterState_New audit events are raised when called through _xxsubinterpreters module (GH-25506)

2021-04-21T22:34:29+00:00

bpo-40941: Unify implicit and explicit state in the frame and generator objects into a single value. (GH-20803)

2020-07-17T10:44:23+00:00

* Merge gen and frame state variables into one.

* Replace stack pointer with depth in PyFrameObject. Makes code easier to read and saves a word of memory.

Revert "bpo-32604: [_xxsubinterpreters] Propagate exceptions. (GH-19768)" (GH-20089)

2020-05-14T16:46:24+00:00

* Revert "bpo-40613: Remove compiler warning from _xxsubinterpretersmodule (GH-20069)"

This reverts commit fa0a66e62d087765dbc5c1b89d6149a23ecfb0a6.

* Revert "bpo-32604: [_xxsubinterpreters] Propagate exceptions. (GH-19768)"

This reverts commit a1d9e0accd33af1d8e90fc48b34c13d7b07dcf57.

bpo-40613: Remove compiler warning from _xxsubinterpretersmodule (GH-20069)

2020-05-13T13:38:27+00:00

bpo-32604: [_xxsubinterpreters] Propagate exceptions. (GH-19768)

2020-05-07T14:56:01+00:00

(Note: PEP 554 is not accepted and the implementation in the code base is a private one for use in the test suite.)

If code running in a subinterpreter raises an uncaught exception then the "run" call in the calling interpreter fails. A RunFailedError is raised there that summarizes the original exception as a string. The actual exception type, __cause__, __context__, state, etc. are all discarded. This turned out to be functionally insufficient in practice. There is a more helpful solution (and PEP 554 has been updated appropriately).

This change adds the exception propagation behavior described in PEP 554 to the _xxsubinterpreters module. With this change a copy of the original exception is set to __cause__ on the RunFailedError. For now we are using "pickle", which preserves the exception's state. We also preserve the original __cause__, __context__, and __traceback__ (since "pickle" does not preserve those).

https://bugs.python.org/issue32604

bpo-40513: _xxsubinterpreters.run_string() releases the GIL (GH-19944)

2020-05-05T18:33:06+00:00

In the experimental isolated subinterpreters build mode,
_xxsubinterpreters.run_string() now releases the GIL.

bpo-40453: Add PyConfig._isolated_subinterpreter (GH-19820)

2020-05-01T09:33:44+00:00

An isolated subinterpreter cannot spawn threads, spawn a child
process or call os.fork().

* Add private _Py_NewInterpreter(isolated_subinterpreter) function.
* Add isolated=True keyword-only parameter to
  _xxsubinterpreters.create().
* Allow again os.fork() in "non-isolated" subinterpreters.

bpo-40429: PyThreadState_GetFrame() returns a strong ref (GH-19781)

2020-04-29T01:01:43+00:00

The PyThreadState_GetFrame() function now returns a strong reference
to the frame.

bpo-38880: List interpreters associated with a channel end (GH-17323)

2020-04-29T00:18:42+00:00

This PR adds the functionality requested by https://github.com/ericsnowcurrently/multi-core-python/issues/52.

Automerge-Triggered-By: @ericsnowcurrently