Hi all:

  According to the the official document of the
*grpc_impl::CompletionQueue::Next()* method:

  Server-side Finish, : *ok* means that the data/metadata/status/etc is
> going to go to the wire. If it is false, it not going to the wire because
> the call is already dead (i.e., canceled, deadline expired, other side
> dropped the channel, etc).


I've also prove it by an experiment:  setting the timeout deadline to A on
the client side, and sleeping on the server side for B which ensures that
the timeout event will indeed happened.  And the server side *Next()* is
exactly acting like what the document said : it return a false value for
the *ok *output parameter.

But what I can't understand is : how does the server detect the timeout
event ? Just by the deadline value set on the client side ?  If it's ture,
the clocks may diff slightly between the server and the client, resulting
in an inaccurate judgement.

Can someone help explaining this ?  Thanks.

- Regards
- Arthur

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