I'm having some doubts on my understanding of the behaviour of a go subroutine in a for loop.
From what I understand, when we have a for loop:
for key := range Map {
go subroutine(Map[key])
}
Where Map has, let's say 3 (key,Value) pairs.
So my understanding is that the subroutine() function will run concurrently using all the Map[Key] values ie subroutine(Map[key1]),subroutine(Map[key2]) and subroutine(Map[key3]) will all run concurrently ?
Is my understanding of concurrent subroutines in a for loop correct?
Thanks!
Yes. Please remember that you will still need the main goroutine alive for these to finish before the program ends. You can use something like sync.WaitGroup:
wg := new(sync.WaitGroup)
for key := range Map {
wg.Add(1)
go func() {
subroutine(Map[key])
wg.Done()
}
}
wg.Wait()
Or if you have something like a server loop going on in the main routine you may not need that at all since your program won't finish until a relevant signal is externally sent to it.
Hope that helps.