You can use the select statement with a default. In case it is not possible to do any of the cases, like sending to a full channel, the statement will do the default: package main import “fmt” func main() { ch := make(chan int, 1) // Fill it up ch <- 1 select { case … Read more
For many use cases where the best tool so far was Channel, Flow has become the new best tool. As a specific example, callbackFlow is now the best approach to receiving data from a 3rd-party API’s callback. This works especially well in a GUI setting. It couples the callback, a channel, and the associated receiving … Read more
Both will work indeed. But one will be more constraining. The form with the arrow pointing away from the chan keyword means that the returned channel will only be able to be pulled from by client code. No pushing allowed : the pushing will be done by the random number generator function. Conversely, there’s a … Read more
I always recommend that the direction is passed everywhere it is possible, e.g. func serve(ch <-chan SomeType) { /*do stuff*/ } func serve(ch chan<- SomeType) { /*do stuff*/ } By including the arrow <-chan or chan<-, you are achieving three things: You are making it clear that the parameter is one end of a channel. … Read more
Independently of the correctness of your second example (as explained in the comments, you aren’t doing what you think, but it’s easily fixable), I tend to think that the first example is easier to grasp. Now, I wouldn’t even say that channels are more idiomatic. Channels being a signature feature of the Go language shouldn’t … Read more
The source file for channels is (from your go source code root) in /src/pkg/runtime/chan.go. hchan is the central data structure for a channel, with send and receive linked lists (holding a pointer to their goroutine and the data element) and a closed flag. There’s a Lock embedded structure that is defined in runtime2.go and that … Read more
It can use either. By default, preference is given to UDP, but depending on the firewall(s) in between the peers connecting it may only be able to connect with TCP. You can use Wireshark to capture packets and verify whether TCP or UDP is being used. In Chrome you can also see details on the … Read more
If you use route change command, you need to restart network service to apply the changes, e.g.: $ sudo /etc/rc.d/netif restart
The buffer size is the number of elements that can be sent to the channel without the send blocking. By default, a channel has a buffer size of 0 (you get this with make(chan int)). This means that every single send will block until another goroutine receives from the channel. A channel of buffer size … Read more
There’s no way to write a safe application where you need to know whether a channel is open without interacting with it. The best way to do what you’re wanting to do is with two channels — one for the work and one to indicate a desire to change state (as well as the completion … Read more