Example
Imagine a goroutine with a two step process, where the main thread needs to do some work between each step:
func main() {
ch := make(chan struct{})
go func() {
// Wait for main thread's signal to begin step one
<-ch
// Perform work
time.Sleep(1 * time.Second)
// Signal to main thread that step one has completed
ch <- struct{}{}
// Wait for main thread's signal to begin step two
<-ch
// Perform work
time.Sleep(1 * time.Second)
// Signal to main thread that work has completed
ch <- struct{}{}
}()
// Notify goroutine that step one can begin
ch <- struct{}{}
// Wait for notification from goroutine that step one has completed
<-ch
// Perform some work before we notify
// the goroutine that step two can begin
time.Sleep(1 * time.Second)
// Notify goroutine that step two can begin
ch <- struct{}{}
// Wait for notification from goroutine that step two has completed
<-ch
}
