goroutine-exit.md

Wait for goroutines to exit

Given a goroutine spawned by the system, there must be a way to wait for the goroutine to exit. There are two popular ways to do this:

• Use a sync.WaitGroup. Do this if there are multiple goroutines that you want to wait for

  var wg sync.WaitGroup
  for i := 0; i < N; i++ {
    wg.Add(1)
    go func() {
      defer wg.Done()
      // ...
    }()
  }
  
  // To wait for all to finish:
  wg.Wait()

• Add another chan struct{} that the goroutine closes when it's done. Do this if there's only one goroutine.

  done := make(chan struct{})
  go func() {
    defer close(done)
    // ...
  }()
  
  // To wait for the goroutine to finish:
  <-done