Newbie Question: Do I need to start GRPC server in own thread?

[maxwel...@gmail.com]

Hi,

I have a machine control program which is written in c++. I want this program to also have a grpc server, so that one can remotely check the status of the machine. I followed the tutorial and start the server like this:

  builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
  builder.RegisterService(&service);
  std::unique_ptr<Server> server(builder.BuildAndStart());
  server->Wait();

the wait() seems to be blocking, so my machine user interface does not continue. Does this mean I need to start the grpc server in its own thread?

Best regards,

Maxwell

[Christian Rivasseau]

Or don't call Wait() ?

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Christian Rivasseau
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[maxwel...@gmail.com]

Ah, so the server is also running if I dont call wait?

[Christopher Warrington - MSFT]

On Tuesday, March 12, 2019 at 3:22:26 AM UTC-7, maxwel...@gmail.com wrote:
> Ah, so the server is also running if I dont call wait?

Yes. Among other things, BuildAndStart() starts listenting for requests.

Wait() is using during shutdown typically. Here's an excerpt from the
documentation for Wait() [1] that :

> Block waiting for all work to complete.
>
> Warning
>
> The server must be either shutting down or some other thread must call
> Shutdown for this function to ever return.

[1]: https://grpc.io/grpc/cpp/classgrpc_1_1_server_interface.html#ac36477b6a7593a4e4608c7eb712b0d70

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Christopher Warrington
Microsoft Corp.