Wait for the termination of n goroutines

Question

I need to start a huge amount of goroutines and wait for their termination. The intuitive way seems to use a channel to wait till all of them are finished :

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Answer 1

This task in not exactly trivial, it's quite easy to write a buggy one. I recommend to use a ready made solution in the stdlib - sync.WaitGroup. Quoting from the link:

A WaitGroup waits for a collection of goroutines to finish. The main goroutine calls Add to set the number of goroutines to wait for. Then each of the goroutines runs and calls Done when finished. At the same time, Wait can be used to block until all goroutines have finished.