[stock_toaster]

Thanks. I think I understand a bit better now.

Go provides concurrency primitives (scheduler yielding i/o, channels, goroutines, etc) upon which you can build your own "events". I agree (and this seems to be your point) that Go doesn't provide a canned event mechanism that you can just hook into for callbacks on IO.

For example in the Go http server[1] a goroutine accepts in a loop and kicks off goroutines to process and handle new requests.

[1]: http://golang.org/src/pkg/net/http/server.go?s=30200:30241#L...

[tptacek]

Sure, I'm using the Go http server.

Take the example of a simple proxy to see where I'm coming from. Sure, I'm happy to have Go manage all the connections and sockets and I'm happy to spawn new goroutines for each connection and all that. But a proxy accepts an inbound connection, makes an outbound connection, and then monitors the outbound and inbound sides for data. The loop to do this with sockets could be a simple two-descriptor read select(2) call. But instead, I have to spawn two more goroutines, one to "monitor" (really, read) from inbound, and one for outbound.

[smegel]

> But instead, I have to spawn two more goroutines, one to "monitor" (really, read) from inbound, and one for outbound.

What does Golang's select/case not do that you want?

[tptacek]

Is there some feature of the language or the libraries that I am missing that turns a socket (err, a TCPConn) into a channel that I can read with Golang's select construction? Seriously asking. That would be awesome.

[smegel]

No, I think you would need to wrap the TCPConn in a goroutine that does the Read, handles any errors, then passes the bytes back to the consumer via a channel. At least it would be a very generic and small goroutine to do this.

I agree that would be a nice feature though.

[tptacek]

You know what's happening in this thread? I made it sound like I was criticizing Go for needing to spawn goroutines to do this. I'm not! It makes sense, in the context of Go, to do it this way, even though as a C programmer by training that's not my first thought on how to do it.

I'm not criticizing Go for being anti-event; I'm just observing that it is. Idiomatic Go --- like, the code in the standard library --- has a strong bias towards straight-line code.

[smegel]

> I'm not criticizing Go for being anti-event; I'm just observing that it is. Idiomatic Go --- like, the code in the standard library --- has a strong bias towards straight-line code.

I think I understand where you are coming from now - I think you are saying Go is "anti-event-based-callback-driven" rather than "anti-event-loop-implementation" - which is absolutely true. Go's concurrency model is build on CSP (Hoare's Communicating Sequential Processes)[1] which seems to advocate procedural threads rather than callbacks.

[1] http://golang.org/doc/go_faq.html#goroutines

[drivebyacct2]

Is there a large overhead for having to use a goroutine rather than the lower level? Do you think it's appropriate for Go to expose that, or do you just miss it?

[cmccabe]

> Is there a large overhead for having to use a > goroutine rather than the lower level?

No.