aspnet/DependencyInjection — pull request #145 by victorhurdugaci (2014-11-26 20:20:48+00:00)
Title: Circular dependencies check

@halter73 the flag idea doesn't work because we can get a deadlock when services are requested from multiple threads - I had to use a collection instead.

There might be a perf hit, that's why I'm waiting until Monday so that @troydai can have a successful perf run before my checkin.

Fixes https://github.com/aspnet/DependencyInjection/issues/131

@halter73 and @loudej can you please review?