#12098: Make multiprocessing's child processes inherit sys.flags on Windows
Initial patch by Sergey Mezentsev.
diff --git a/Lib/multiprocessing/util.py b/Lib/multiprocessing/util.py
index 9b6dac2..7c71081 100644
--- a/Lib/multiprocessing/util.py
+++ b/Lib/multiprocessing/util.py
@@ -7,6 +7,7 @@
# Licensed to PSF under a Contributor Agreement.
#
+import sys
import functools
import itertools
import weakref
@@ -295,3 +296,33 @@
register_after_fork(self, lambda obj : obj.__dict__.clear())
def __reduce__(self):
return type(self), ()
+
+#
+# Get options for python to produce the same sys.flags
+#
+
+def _args_from_interpreter_flags():
+ """Return a list of command-line arguments reproducing the current
+ settings in sys.flags and sys.warnoptions."""
+ flag_opt_map = {
+ 'debug': 'd',
+ # 'inspect': 'i',
+ # 'interactive': 'i',
+ 'optimize': 'O',
+ 'dont_write_bytecode': 'B',
+ 'no_user_site': 's',
+ 'no_site': 'S',
+ 'ignore_environment': 'E',
+ 'verbose': 'v',
+ 'bytes_warning': 'b',
+ 'quiet': 'q',
+ 'hash_randomization': 'R',
+ }
+ args = []
+ for flag, opt in flag_opt_map.items():
+ v = getattr(sys.flags, flag)
+ if v > 0:
+ args.append('-' + opt * v)
+ for opt in sys.warnoptions:
+ args.append('-W' + opt)
+ return args