Is the main function runs as a goroutine?

Question

Is the main() function runs as a goroutine? For example, I\'ve seen a crash stack trace like the below, which makes me ask:

goroutine 1 [running         


        

Answer 1

Yes. Main func can spawn other goroutines, but "main" itself is one groutine.

package main

import (
        "fmt"
        "runtime"
)

func main() {
        // Goroutine num includes main processing
        fmt.Println(runtime.NumGoroutine()) // 1

        // Spawn two goroutines
        go func() {}()
        go func() {}()

        // Total three goroutines run
        fmt.Println(runtime.NumGoroutine()) // 3
}