👀 Views: 65 💬 Answers: 1 📅 Created: 2025-06-22

go concurrency channels sync Go

I'm optimizing some code but I'm stuck trying to I'm encountering a deadlock situation in my Go application when using both channels and `sync.WaitGroup`... I have a worker pool pattern where multiple goroutines are processing jobs sent over a channel. However, I'm noticing that sometimes the program just hangs indefinitely. My initial implementation looks something like this: ```go package main import ( "fmt" "sync" "time" ) func worker(id int, jobs <-chan int, wg *sync.WaitGroup) { defer wg.Done() for job := range jobs { fmt.Printf("Worker %d processing job %d\n", id, job) time.Sleep(time.Second) // Simulate work } } func main() { const numWorkers = 3 jobs := make(chan int) var wg sync.WaitGroup for w := 1; w <= numWorkers; w++ { wg.Add(1) go worker(w, jobs, &wg) } // Sending jobs for j := 1; j <= 5; j++ { jobs <- j } close(jobs) // Close the channel to indicate no more jobs wg.Wait() // Wait for all workers to finish fmt.Println("All jobs processed") } ``` The issue arises because the goroutines are waiting for the jobs channel to close, but if I have a condition where all jobs are processed quickly, the main function might close the channel while one of the workers is still busy processing. I tried adding a sleep before closing the jobs channel, but that seems like a hack and doesn't guarantee the desired behavior. I've also thought about using a buffered channel to prevent blocking, but I'm not sure if that's the right approach here. I'm looking for guidance on best practices for synchronizing worker goroutines with channels and `WaitGroup` to avoid deadlocks without introducing unnecessary complexity. Any insights or suggestions would be greatly appreciated! Thanks in advance!