How to Cancel a Goroutine in Go

The example below shows how to cancel a goroutine while is in the middle of executing a long-running task.

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package main   import (     "context"     "fmt"     "time" )   func main() {     busyChan := make(chan bool)       ctx, cancel := context.WithCancel(context.Background())     go func(ctx context.Context) {         for {             select {             case <-busyChan:                 fmt.Println("Pretending to be very busy")                 time.Sleep(5000 * time.Second)             case <-ctx.Done():                 return             }         }     }(ctx)     busyChan <- true     fmt.Println("Doing some other things")     time.Sleep(3 * time.Second)     fmt.Println("Stopping the goroutine")     cancel() }

Output:

Prentending to be very busy
Doing some other things
Stopping the goroutine