On 16 March 2018 at 14:45, Sathish VJ <[email protected]> wrote:
> 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(". ")
> }
While this is running, your select won't be receiving on the quit
channel, even if it is non-nil.
If you want to be able to cancel it, you'll need to make the code in
the loop responsive to the quit channel
(for example, by using a select like you're using in f already).
> 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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