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backend/venv/Lib/site-packages/billiard/_ext.py

@@ -0,0 +1,32 @@
+import sys
+
+supports_exec = True
+
+from .compat import _winapi as win32  # noqa
+
+if sys.platform.startswith("java"):
+    _billiard = None
+else:
+    try:
+        import _billiard                                # noqa
+    except ImportError:
+        import _multiprocessing as _billiard            # noqa
+        supports_exec = False
+
+
+def ensure_multiprocessing():
+    if _billiard is None:
+        raise NotImplementedError("multiprocessing not supported")
+
+
+def ensure_SemLock():
+    try:
+        from _billiard import SemLock                   # noqa
+    except ImportError:
+        try:
+            from _multiprocessing import SemLock        # noqa
+        except ImportError:
+            raise ImportError("""\
+This platform lacks a functioning sem_open implementation, therefore,
+the required synchronization primitives needed will not function,
+see issue 3770.""")