Synchronous calls interfere with other EV users

[uweber]

Synchronous calls are not really blocking, because they use the asynchronous implementation.
When there are multiple EV consumer working with the same default loop, they interfere with each other. E.g. AnyEvent from VM-EC2 and Mojos event loop.

My current workaround for this is to use a real blocking call in VM-EC2:
uweber@1ac734f