gen_server locked for some time
Mon Dec 2 14:52:44 CET 2019
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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