python/cpython

…H-17652)

Fix test_ressources_gced_in_workers() of test_concurrent_futures:
explicitly stop the manager to prevent leaking a child process
running in the background after the test completes.

Multiprocessing and concurrent.futures tests now stop the resource
tracker process when tests complete.

Add ResourceTracker._stop() method to
multiprocessing.resource_tracker.

Add _cleanup_tests() helper function to multiprocessing.util: share
code between multiprocessing and concurrent.futures tests.

Each Python subinterpreter now has its own "small integer
singletons": numbers in [-5; 257] range.

It is no longer possible to change the number of small integers at
build time by overriding NSMALLNEGINTS and NSMALLPOSINTS macros:
macros should now be modified manually in pycore_pystate.h header
file.

For now, continue to share _PyLong_Zero and _PyLong_One singletons
between all subinterpreters.

Replace hardcoded timeout constants in tests with SHORT_TIMEOUT of
test.support, so it's easier to ajdust this timeout for all tests at
once.

SHORT_TIMEOUT is 30 seconds by default, but it can be longer
depending on --timeout command line option.

The change makes almost all timeouts longer, except
test_reap_children() of test_support which is made 2x shorter:
SHORT_TIMEOUT should be enough. If this test starts to fail,
LONG_TIMEOUT should be used instead.

Uniformize also "from test import support" import in some test files.

Replace hardcoded timeout constants in tests with INTERNET_TIMEOUT of
test.support, so it's easier to ajdust this timeout for all tests at
once.

Replace hardcoded timeout constants in tests with LONG_TIMEOUT of
test.support, so it's easier to ajdust this timeout for all tests at
once.

LONG_TIMEOUT is 5 minutes by default, but it can be longer depending
on --timeout command line option.

Tests no longer pass a timeout value to join_thread() of
test.support: use the default join_thread() timeout instead
(SHORT_TIMEOUT constant of test.support).

Replace hardcoded timeout constants in tests with LOOPBACK_TIMEOUT of
test.support, so it's easier to ajdust this timeout for all tests at
once.

In Python 3.9.0a1, sys.argv[0] was made an asolute path if a filename
was specified on the command line. Revert this change, since most
users expect sys.argv to be unmodified.

Fix asyncio when the ssl module is missing: only check for
ssl.SSLSocket instance if the ssl module is available.

array.array: Remove tostring() and fromstring() methods.  They were
aliases to tobytes() and frombytes(), deprecated since Python 3.2.

Fix test_pty: if the process is the session leader, closing the
master file descriptor raises a SIGHUP signal: simply ignore SIGHUP
when running the tests.

bpo-38858, bpo-38997: _PySys_Create() returns a strong reference to
the sys module: Py_DECREF() is needed when we are done with the
module.

test.support: run_python_until_end(), assert_python_ok() and
assert_python_failure() functions no longer strip whitespaces from
stderr.

If waitpid() is called elsewhere, waitpid() call fails with
ChildProcessError: use return code 255 in this case, and log a
warning. It ensure that the pidfd file descriptor is closed if this
error occurs.

Add a new pycore_interp_init() function called by new_interpreter()
and pyinit_config().

new_interpreter() now calls _PySys_Create() to create a new sys
module isolated from the main interpreter. It now calls
_PySys_InitCore() and _PyImport_FixupBuiltin().

init_interp_main() now calls _PySys_InitMain().

Use the "volatile" keyword to prevent tail call optimization
on any compiler, rather than relying on compiler specific pragma.

Remove PyUnicode_ClearFreeList() function: the Unicode free list has
been removed in Python 3.3.

…7353)

new_interpreter() now calls _PyBuiltin_Init() to create the builtins
module and calls _PyImport_FixupBuiltin(), rather than using
_PyImport_FindBuiltin(tstate, "builtins").

pycore_init_builtins() is now responsible to initialize
intepr->builtins_copy: inline _PyImport_Init() and remove this
function.

…H-17350)

If _PyImport_FixupExtensionObject() is called from a subinterpreter,
leave extensions unchanged and don't copy the module dictionary
into def->m_base.m_copy.

Fix new_interpreter() error handling: undo it all if status is an
exception.

Py_EndInterpreter() now clears the filesystem codec.

finalize_interp_clear() now explicitly clears the codec registry and
then trigger a GC collection to clear all references.

Skip the test_posix.test_pidfd_open() test if os.pidfd_open() fails
with a PermissionError. This situation can happen in a Linux sandbox
using a syscall whitelist which doesn't allow the pidfd_open()
syscall yet (like systemd-nspawn).

test_capi: trashcan tests now require the test "cpu" resource.

Allocate small Python integers (small_ints of longobject.c) on the
heap, rather than using static objects.

)

Use _Py_IsMainInterpreter() in Py_Initialize() and Py_Finalize() to
detect if the current interpreter is the main interpreter or not.

…ist() (GH-17284)

Remove PyMethod_ClearFreeList() and PyCFunction_ClearFreeList()
functions: the free lists of bound method objects have been removed.

Remove also _PyMethod_Fini() and _PyCFunction_Fini() functions.

* Rename _PyGC_InitializeRuntime() to _PyGC_InitState()
* finalize_interp_clear() now also calls _PyGC_Fini() in
  subinterpreters (clear the GC state).

Exclude PyFPE_START_PROTECT() and PyFPE_END_PROTECT() macros of
pyfpe.h from Py_LIMITED_API (stable API).