That's correct. You can read more about the async API here https://grpc.io/docs/languages/cpp/async/, specifically where it says you have to call `Next` to poll for events. The callback API leverages gRPC-internal threads to execute application-provided callbacks. The callback API is described in more detail here: https://github.com/grpc/proposal/blob/master/L67-cpp-callback-api.md
On Thursday, October 20, 2022 at 5:03:26 PM UTC-7 Rohit Zambre wrote: > Got it, thank you. > > This may be an orthogonal question -- does the async API (polling for > events on the completion queue) steal from the application's threads? In > other words, is the gRPC runtime running in the background even in the > async API? > I have been using the async API under the assumption that the gRPC engine > is not invoked (except for accepting new connection requests) until I call > Next() or AsyncNext() on a completion queue. > > On Wed, Oct 19, 2022 at 11:36 AM 'AJ Heller' via grpc.io < > grp...@googlegroups.com> wrote: > >> That's fine. You can replace the Wait call with >> `absl::SleepFor(absl::Seconds(42))` and it should work fine since the >> callback API does not need to borrow threads from the application. At >> shutdown, you'll still may want to wait on the gRPC server to finish doing >> its job before exiting, but that's a separate matter. >> On Wednesday, October 12, 2022 at 3:13:35 PM UTC-7 Rohit Zambre wrote: >> >>> Hi, >>> >>> Is it possible to use the callback API without calling server->Wait()? >>> >>> In the route_guide example, I see that route_guide_callback_sever.cc >>> calls server->Wait(). In my use case, I cannot block on a call like Wait(). >>> >>> Regards, >>> Rohit >>> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "grpc.io" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/grpc-io/hnQ60W6hPMA/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> grpc-io+u...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/grpc-io/95ef746c-dd34-4a14-b7be-c10e9930e1can%40googlegroups.com >> >> <https://groups.google.com/d/msgid/grpc-io/95ef746c-dd34-4a14-b7be-c10e9930e1can%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "grpc.io" group. To unsubscribe from this group and stop receiving emails from it, send an email to grpc-io+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/grpc-io/a3e3fbae-3ef6-46a7-877a-fa06f7e7f8abn%40googlegroups.com.
