Mastering Go - Second Edition

Timing out a goroutine – take 2

The source code of the second technique will be saved in timeOut2.go, and it will be presented in five parts. This time, the timeout period is provided as a command-line argument to the program.

The first part of timeOut2.go is as follows:

package main 
 
import ( 
    "fmt" 
    "os" 
    "strconv" 
    "sync" 
    "time" 
) 

The second code segment of timeOut2.go is shown in the following Go code:

func timeout(w *sync.WaitGroup, t time.Duration) bool { 
    temp := make(chan int) 
    go func() { 
        defer close(temp)         time.Sleep(5 * time.Second) 
 
        w.Wait() 
    }() 
 
    select { 
    case <-temp: 
        return false 
    case <-time.After(t): 
        return true 
    } 
} 

In the preceding code, the time duration that will be used in the time.After() call is a parameter to the timeout() function, ...