mirror of
https://github.com/genuinetools/reg.git
synced 2024-07-07 05:24:17 -04:00
34 lines
1.5 KiB
Markdown
34 lines
1.5 KiB
Markdown
# Concurrency
|
|
|
|
In general, gRPC-go provides a concurrency-friendly API. What follows are some
|
|
guidelines.
|
|
|
|
## Clients
|
|
|
|
A [ClientConn][client-conn] can safely be accessed concurrently. Using
|
|
[helloworld][helloworld] as an example, one could share the `ClientConn` across
|
|
multiple goroutines to create multiple `GreeterClient` types. In this case, RPCs
|
|
would be sent in parallel.
|
|
|
|
## Streams
|
|
|
|
When using streams, one must take care to avoid calling either `SendMsg` or
|
|
`RecvMsg` multiple times against the same [Stream][stream] from different
|
|
goroutines. In other words, it's safe to have a goroutine calling `SendMsg` and
|
|
another goroutine calling `RecvMsg` on the same stream at the same time. But it
|
|
is not safe to call `SendMsg` on the same stream in different goroutines, or to
|
|
call `RecvMsg` on the same stream in different goroutines.
|
|
|
|
## Servers
|
|
|
|
Each RPC handler attached to a registered server will be invoked in its own
|
|
goroutine. For example, [SayHello][say-hello] will be invoked in its own
|
|
goroutine. The same is true for service handlers for streaming RPCs, as seen
|
|
in the route guide example [here][route-guide-stream].
|
|
|
|
[helloworld]: https://github.com/grpc/grpc-go/blob/master/examples/helloworld/greeter_client/main.go#L43
|
|
[client-conn]: https://godoc.org/google.golang.org/grpc#ClientConn
|
|
[stream]: https://godoc.org/google.golang.org/grpc#Stream
|
|
[say-hello]: https://github.com/grpc/grpc-go/blob/master/examples/helloworld/greeter_server/main.go#L41
|
|
[route-guide-stream]: https://github.com/grpc/grpc-go/blob/master/examples/route_guide/server/server.go#L126
|