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Mastering Concurrency in Go

WaitGroups

Explore how to use WaitGroups in Go to synchronize multiple goroutines. Understand the functions Add, Done, and Wait to control execution flow and ensure all goroutines finish before the program exits. This lesson clarifies core concurrency management techniques essential for reliable Go programs.

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What is a WaitGroup?

A WaitGroup blocks a program and waits for a set of goroutines to finish before moving to the next steps of execution.

How to use WaitGroup?

We can use WaitGroups through the following functions:

  • .Add(int): This function takes in an integer value which is essentially the number of goroutines which the waitgroup has to wait for. This function must be called before we execute a goroutine.
  • .Done(): This function is called within the goroutine to signal that the goroutine has successfully executed.
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