It also makes #2 above hard in practice. You simply don't know when to block. That's one of the reasons Linux developers are, shall we say, conservative with re

It also makes #2 above hard in practice. You simply don't know when to block. That's one of the reasons Linux developers are, shall we say, conservative with regards to the entropy pool. On a recent Linux environment those problems are solved however. Use proper random drivers for your virtualized environment and use getrandom() in your application.