Select With No Cases Blocks Forever

Why This Happens

select{} with no cases blocks the current goroutine permanently. This is sometimes used intentionally in main to keep a server running, but if used accidentally or if all other goroutines also block, it causes a deadlock.

The Problem

func main() {
    select {} // blocks forever, no other goroutines running
}

The Fix

func main() {
    srv := &http.Server{Addr: ":8080"}
    go func() {
        if err := srv.ListenAndServe(); err != nil {
            log.Fatal(err)
        }
    }()
    // Block main goroutine while server runs
    quit := make(chan os.Signal, 1)
    signal.Notify(quit, os.Interrupt)
    <-quit
    srv.Shutdown(context.Background())
}

Step-by-Step Fix

1. 1

   Identify the empty select

   Find select{} statements that may cause unintended blocking.

2. 2

   Add exit conditions

   Add a case for a quit channel, signal, or context cancellation.

3. 3

   Use proper shutdown

   Implement graceful shutdown with os/signal and context for production services.