Go: What is the Purpose of an Empty `select` Statement?

Go: Purpose of Empty Select Statements

Question:

Within the net/http/httptest package, I encountered the following code:

s.Config.Serve(s.Listener)
if *serve != "" {
  fmt.Fprintln(os.Stderr, "httptest: serving on", s.URL)
  select {}
}

What is the role of the empty select statement in this code?

Answer:

An empty select statement, like select {}, functions as a blocking mechanism, similar to an empty for statement (for {}). It pauses program execution indefinitely, allowing time for other processes to occur.

In most supported Go architectures, the empty select statement releases processor resources, unlike the empty for statement, which can cause continuous CPU utilization. Therefore, select {} is often preferred when extended waiting periods are necessary.

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