As you never close the ch channel, the range loop will never finish. You can’t send back the result on the same channel. A solution is to use a different one. Your program could be adapted like this : package main import ( “fmt” ) func total(in chan int, out chan int) { res := … Read more
You don’t need mutex if you use channels correctly. In some cases a solution with mutex might be simpler though. Just make sure the variable(s) holding the channel values are properly initialized before multiple goroutines try to access the channel variables. Once this is done, accessing the channels (e.g. sending values to or receiving values … Read more
chan is a channel in Golang. In simple word you can think it as a box in which you put a item at one end and then pick it from other end. Unbuffered Channels Buffered Channel This is the small code I have written for you to understand channels. Now change order of go routines … Read more
Goroutines run concurrently, independently, so without explicit synchronization you can’t predict execution and completion order. So as it is, you can’t pair returned numbers with the input numbers. You can either return more data (e.g. the input number and the output, wrapped in a struct for example), or pass pointers to the worker functions (launched … Read more
Function calls and goroutines cannot be terminated from the caller, the functions and goroutines have to support the cancellation, often via a context.Context value or a done channel. In either case, the functions are responsible to check / monitor the context, and if cancel is requested (when the Context’s done channel is closed), return early. … Read more
You can’t convert &’a T into &’static T except by leaking memory. Luckily, this is not necessary at all. There is no reason to send borrowed pointers to the thread and keep the lines on the main thread. You don’t need the lines on the main thread. Just send the lines themselves, i.e. send String. … Read more
A Connection represents a real TCP connection to the message broker, whereas a Channel is a virtual connection (AMQP connection) inside it. This way you can use as many (virtual) connections as you want inside your application without overloading the broker with TCP connections. You can use one Channel for everything. However, if you have … Read more
The Go select statement is not biased toward any (ready) cases. Quoting from the spec: If one or more of the communications can proceed, a single one that can proceed is chosen via a uniform pseudo-random selection. Otherwise, if there is a default case, that case is chosen. If there is no default case, the … Read more
It’s OK to leave a Go channel open forever and never close it. When the channel is no longer used, it will be garbage collected. Note that it is only necessary to close a channel if the receiver is looking for a close. Closing the channel is a control signal on the channel indicating that … Read more
When the main function ends, the program ends with it. It does not wait for other goroutines to finish. Quoting from the Go Language Specification: Program Execution: Program execution begins by initializing the main package and then invoking the function main. When that function invocation returns, the program exits. It does not wait for other … Read more