gh-84559: Remove the new multiprocessing warning, too disruptive. by gpshead · Pull Request #101551 · python/cpython

Expand Up @@ -23,9 +23,6 @@ class TimeoutError(ProcessError): class AuthenticationError(ProcessError): pass
class DefaultForkDeprecationWarning(DeprecationWarning): pass
# # Base type for contexts. Bound methods of an instance of this type are included in __all__ of __init__.py # Expand Down Expand Up @@ -284,23 +281,6 @@ def _Popen(process_obj): from .popen_fork import Popen return Popen(process_obj)
_warn_package_prefixes = (os.path.dirname(__file__),)
class _DeprecatedForkProcess(ForkProcess): @classmethod def _Popen(cls, process_obj): import warnings warnings.warn( "The default multiprocessing start method will change " "away from 'fork' in Python >= 3.14, per GH-84559. " "Use multiprocessing.get_context(X) or .set_start_method(X) to " "explicitly specify it when your application requires 'fork'. " "The safest start method is 'spawn'.", category=DefaultForkDeprecationWarning, skip_file_prefixes=_warn_package_prefixes, ) return super()._Popen(process_obj)
class SpawnProcess(process.BaseProcess): _start_method = 'spawn' @staticmethod Expand All @@ -324,9 +304,6 @@ class ForkContext(BaseContext): _name = 'fork' Process = ForkProcess
class _DefaultForkContext(ForkContext): Process = _DeprecatedForkProcess
class SpawnContext(BaseContext): _name = 'spawn' Process = SpawnProcess Expand All @@ -342,16 +319,13 @@ def _check_available(self): 'fork': ForkContext(), 'spawn': SpawnContext(), 'forkserver': ForkServerContext(), # Remove None and _DefaultForkContext() when changing the default # in 3.14 for https://github.com/python/cpython/issues/84559. None: _DefaultForkContext(), } if sys.platform == 'darwin': # bpo-33725: running arbitrary code after fork() is no longer reliable # on macOS since macOS 10.14 (Mojave). Use spawn by default instead. _default_context = DefaultContext(_concrete_contexts['spawn']) else: _default_context = DefaultContext(_concrete_contexts[None]) _default_context = DefaultContext(_concrete_contexts['fork'])
else:
Expand Down