Merge pull request #454 from BlueBrain/win32_compatibility

Fix get_context of multiprocessing for windows compatibility

Author: DrTaDa

bluepyopt/ephys/protocols.py

@@ -25,6 +25,7 @@
 # pylint: disable=W0511
 
 import os
+import sys
 import collections
 import tempfile
 
@@ -265,7 +266,16 @@ def _reduce_method(meth):
 
             # Default context for python>=3.8 on macos is spawn.
             # Spwan context would reset NEURON properties, such as dt.
-            multiprocessing_context = multiprocessing.get_context('fork')
+            if sys.platform == 'win32':
+                multiprocessing_context = multiprocessing.get_context('spawn')
+                if (
+                    sim is not None and not sim.cvode_active and
+                    sim.dt != 0.025
+                ):
+                    logger.warning("On Windows, evaluation might break when"
+                                   "using non-default fixed time steps.")
+            else:
+                multiprocessing_context = multiprocessing.get_context('fork')
 
             if timeout is not None:
                 if timeout < 0: