From 8b788b7e95a054fdd333a02fc9b01c4479042547 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 29 Aug 2011 18:54:28 -0600
Subject: [PATCH] ...

---
 src/calibre/utils/ipc/worker.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/calibre/utils/ipc/worker.py b/src/calibre/utils/ipc/worker.py
index f2368bb495..1381abbc2d 100644
--- a/src/calibre/utils/ipc/worker.py
+++ b/src/calibre/utils/ipc/worker.py
@@ -152,6 +152,12 @@ def get_func(name):
 
 def main():
     if iswindows:
+        if '--multiprocessing-fork' in sys.argv:
+            # We are using the multiprocessing module on windows to launch a
+            # worker process
+            from multiprocessing import freeze_support
+            freeze_support()
+            return 0
         # Close open file descriptors inherited from parent
         # On Unix this is done by the subprocess module
         os.closerange(3, 256)