38 lines
828 B
Go
38 lines
828 B
Go
// A _goroutine_ is a lightweight thread of execution.
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package main
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import "fmt"
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func f(from string) {
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for i := 0; i < 3; i++ {
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fmt.Println(from, ":", i)
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}
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}
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func main() {
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// Suppose we have a function call `f(s)`. Here's how
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// we'd call that in the usual way, running it
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// synchronously.
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f("direct")
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// To invoke this function in a goroutine, use
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// `go f(s)`. This new goroutine will execute
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// concurrently with the calling one.
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go f("goroutine")
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// You can also start a goroutine for an anonymous
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// function call.
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go func(msg string) {
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fmt.Println(msg)
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}("going")
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// Our two function calls are running asynchronously in
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// separate goroutines now, so execution falls through
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// to here. This `Scanln` requires we press a key
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// before the program exits.
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fmt.Scanln()
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fmt.Println("done")
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}
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