workerCount = runtime.GOMAXPROCS(0)
	}
	wk, err := workers.New(workerCount)
	if err != nil {
		panic(err)
	}
	for i := 0; i < workerCount; i++ {
		wk.Take()
		go func() {
			defer wk.Give()

			for {
				select {
				case av := <-list.queue:
					list.sendSync(av.ev, av.targetSet)
				case <-list.ctx.Done():
					return
				}
			}
		}()
	}
	wk.Wait()
}