Run until all or condition met

gistfile1.go

drain := make(chan bool, len(tasks))

answer := make(chan interface{}, 1)
drained := make(chan bool, 1)

for _, v := range tasks {
  go func(){
    defer func(){
      drain <- true
    }()
    
    // Find an answer
    // answer <- myAnswer
  }()
}

go func(){
  for i:=0;i<len(tasks);i+=1 {
    <-drain
  }
}()

select {
  case <-drained:
    return nil
    
  case a := <-answer:
    return a
}