[asio]Can I call socket.close() in different thread?

Hi

I use a thread pool to run one io_service instance, after a socket
connected to a server, I want to call _socket.close() to close it.
But I don't know how to do this in thread safe way.
In the document, socket class is "Shared objects: Unsafe", becase I use
thread pool, so I don't know which thread will call close on the socket.
What should I do?

Thanks,
Wang Yun

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