whyyyyyyy

also_broken.go

package main                                                                             
                                                                                         
import (                                                                                 
  "fmt"                                                                                  
  "os"                                                                                   
  "os/signal"                                                                            
  "syscall"                                                                              
)                                                                                        
                                                                                         
func main() {                                                                            
  count := 0                                                                             
  quit := make(chan os.Signal)                                                           
  signal.Notify(quit, syscall.SIGINT)                                                    
                                                                                         
  for {                                                                                  
    select {                                                                             
    case <-quit:                                                                         
      goto STANLEY                                                                       
    default:                                                                             
      count += 1                                                                         
      fmt.Println(count)                                                                 
    }                                                                                    
  }                                                                                      
                                                                                         
STANLEY:                                                                                 
                                                                                         
  fmt.Println("done")                                                                    
} 

broken.go

package main

import (
  "fmt"
  "os"
  "os/signal"
  "syscall"
)

func main() {
  count := 0
  quit := make(chan os.Signal)
  signal.Notify(quit, syscall.SIGINT)

  for {
    select {
    case <-quit:
      break
    default:
      count += 1
      fmt.Println(count)
    }
  }

  fmt.Println("done")
}

working.go

package main

import (
  "fmt"
  "os"
  "os/signal"
  "syscall"
)

func count(quit chan bool) {
  var count int 
  for {
    select {
    case <-quit:
      break
    default:
      count += 1
      fmt.Println(count)
    }   
  }
}

func main() {
  quit := make(chan bool)
  sig := make(chan os.Signal)
  signal.Notify(sig, syscall.SIGINT)

  go count(quit)

  <-sig
  quit <- true
  fmt.Println("done")
}