set asyncio loop earlier in controllers (#627)

artiq/frontend/novatech409b_controller.py

@@ -5,6 +5,7 @@
 import argparse
 import logging
 import sys
+import os
 import asyncio
 
 from artiq.devices.novatech409b.driver import Novatech409B
@@ -33,6 +34,9 @@ def main():
     args = get_argparser().parse_args()
     init_logger(args)
 
+    if os.name == "nt":
+        asyncio.set_event_loop(asyncio.ProactorEventLoop())
+
     if not args.simulation and args.device is None:
         print("You need to specify either --simulation or -d/--device "
               "argument. Use --help for more information.")

artiq/frontend/thorlabs_tcube_controller.py

@@ -2,6 +2,8 @@
 
 import argparse
 import sys
+import os
+import asyncio
 
 from artiq.devices.thorlabs_tcube.driver import Tdc, Tpz, TdcSim, TpzSim
 from artiq.protocols.pc_rpc import simple_server_loop
@@ -28,6 +30,9 @@ def main():
     args = get_argparser().parse_args()
     init_logger(args)
 
+    if os.name == "nt":
+        asyncio.set_event_loop(asyncio.ProactorEventLoop())
+
     if not args.simulation and args.device is None:
         print("You need to specify either --simulation or -d/--device "
               "argument. Use --help for more information.")