I have one thread how runs io_service.
I have 2 servers (tcp) ports with all corresponded acceptor and bunch of sockets connected to both ports.

I am looking into the way to stop just one server but still run the other one.
I have implemented a "hard" way to stop server:  remove acceptor, cancel/close sockets, that will trigger all read/write asynchronous callbacks, wait till they all done.

but there is a incontinence I need to know how may callbacks still here.

Is there any simpler way to do the same thing?
Something like block the cancel call until all call back done?

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