do not launch a new thread for completion in `real_time mode
do not launch a new thread for completion in `real_time mode

Ignore-this: b88e9398d1031e82762e30c0b11c7b97

darcs-hash:20100109095625-c41ad-71b6b08914241b02960ad26bb7527fa1fdb57ecb

fdopen/lwt,ocsigen/lwt,gfxmonk/lwt,ocsigen/lwt,rgrinberg/lwt,fdopen/lwt,rgrinberg/lwt,c-cube/lwt,gfxmonk/lwt,rgrinberg/lwt,mirage/lwt,rneswold/lwt,janestreet/lwt-async,mirage/lwt,ocsigen/lwt,janestreet/lwt-async,c-cube/lwt,c-cube/lwt,rneswold/lwt,rgrinberg/lwt,rneswold/lwt,mfp/lwt,mfp/lwt