gen_server locked for some time

[Max Lapshin]

In flussonic we use concept of fast and slow servers.

Fast gen_server must never get blocked and it is safe to gen_server:call
him.   Slow can get blocked on disk I/O or some other job.

Good idea is when slow can ask fast for some job.

Fast can go to slow server, but very carefully: check first if it is safe
to make this call.
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