[go-nuts] Long running task in select case

[Sathish VJ]

All the examples I've seen use some kind of ticker to run various cases of 
a select statement.  But how does one run a long running task that is still 
cancelable?  


In the example below the quit part is never reached.  

https://play.golang.org/p/PLGwrUvKaqn  (it does not run properly on 
play.golang.org).

package main


import (
 "fmt"
 "os"
 "time"
)


func f(quit chan bool) {
 for {
   select {
   case <-time.After(0 * time.Second):
     // start long running task immediately.
     for {
       time.Sleep(500 * time.Millisecond)
       fmt.Printf(". ")
     }
   case <-quit:
     fmt.Println("quit called")
     //deallocate resources in other long running task and then return from 
function.
     os.Exit(0) // or return
   }
 }
}


func main() {
 var quit chan bool
 go f(quit)


 println("quit sending ... ")
 quit <- true
 println("after quit sent")


 var i chan int
 <-i
}


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