如何保持死去的去例行程序的计数？

Question

I have a piece of code where we run multiple go routines multiple to receive values. I am trying to keep count of how many go routines have died due to some exception or error. I don't want to update the count for normal execution.

  for {
    go func(){
       err := receiveValues()

    }()
  }

Here, receiveValues will call other function and return err if they fail

func recieveValues() error{
  if err, val := callSomeFunc(); err != nil{
    return err
  }

  if err2, val2 := callOtherFunc(val); err2 != nil{
    return err2
  }
}

I could check when receiveValues() returns error and increment my count, but I also want to increment my count when go routine exits due to some panic or errors that I didn't expect, what will be the fool proof way to keep track to how many go routines have died?

Answer 1

Use deferred function that will recover from panic.

func count() {
    err := recover()
    if err != nil {
        // count error
    } else {
        // count no error
    }
}

func trap() {
    defer count()
    if rand.Intn(2) >= 1 {
        panic("bad luck")
    }
}