Issue #14335: multiprocessing's custom Pickler subclass now inherits from the C-accelerated implementation.
Patch by sbt.
diff --git a/Lib/multiprocessing/forking.py b/Lib/multiprocessing/forking.py
index b7de567..020508a 100644
--- a/Lib/multiprocessing/forking.py
+++ b/Lib/multiprocessing/forking.py
@@ -55,18 +55,18 @@
# Try making some callable types picklable
#
-from pickle import _Pickler as Pickler
+from pickle import Pickler
+from copyreg import dispatch_table
+
class ForkingPickler(Pickler):
- dispatch = Pickler.dispatch.copy()
+ _extra_reducers = {}
+ def __init__(self, *args):
+ Pickler.__init__(self, *args)
+ self.dispatch_table = dispatch_table.copy()
+ self.dispatch_table.update(self._extra_reducers)
@classmethod
def register(cls, type, reduce):
- def dispatcher(self, obj):
- rv = reduce(obj)
- if isinstance(rv, str):
- self.save_global(obj, rv)
- else:
- self.save_reduce(obj=obj, *rv)
- cls.dispatch[type] = dispatcher
+ cls._extra_reducers[type] = reduce
def _reduce_method(m):
if m.__self__ is None: