Cannot switch to a different thread

[neilyoung]

I'm catching the above error reproducible if a client, which has connected to my GeventWebsockeServer based server, is no longer receiving data, while the server is sending. My websocket server pushes every 100 ms e.g. to a browser app. If I close the lid of PC wich runs the browser client, the a.m. error appears on each send after 30 seconds. Then, if the remote client is listening again, it recovers after another 30 secs.

Anything I can do better here?