blocking peek/pop?

[golightlyb]

Is it possible to block on peek or pop?

Currently I'm just polling in a loop, but I guess in the empty-queue case its lightweight enough: q.RLock() then q.getItemByID(...) => q.Length() => q.tail - q.head, so basically just a lock and a comparison

If it makes the use case easier. I am writing/enqueing from multiple places but only reading/dequeing from one place. I don't mind spurious wakeups and I don't need to race against other goroutines which could also be waiting - I just want to block until the queue is not empty.

Many thanks

func foo(q *goque.Queue) {
    ticker := time.NewTicker(pollPeriod)
    defer ticker.Stop()
    
    for {
        select {
            case <-ticker.C: // blocks
        }
        
        item, err := q.Peek()
        if err == goque.ErrEmpty { continue }
        if err != nil { panic(err) }
        
        fmt.Println(item.ToString())
    }
}

func main() {
   // ...
   go foo(q)
   // ...
}