| A _goroutine_ is a lightweight thread of execution. | ||
package main |
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import ( |
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"fmt" |
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"time" |
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) |
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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 we'd call that in the usual way, running it synchronously. | f("direct") |
direct : 0 direct : 1 direct : 2 |
| To invoke this function in a goroutine, use `go f(s)`. This new goroutine will execute concurrently with the calling one. | go f("goroutine") |
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| You can also start a goroutine for an anonymous function call. | 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 separate goroutines now. Wait for them to finish (for a more robust approach, use a [WaitGroup](waitgroups)). | time.Sleep(time.Second) |
goroutine : 0 goroutine : 1 goroutine : 2 going |
fmt.Println("done") |
goroutine : 2 done |
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} |
going |