func doDecr(id string, signal chan int, client redis.AsyncClient, cnt int) {
key := "ctr-" + id
for i := 0; i < cnt; i++ {
client.Decr(key)
}
signal <- 1
}
func doDecr(id string, signal chan int, client redis.AsyncClient, cnt int) {
var fr redis.FutureInt64
key := "ctr-" + id
for i := 0; i < cnt; i++ {
fr, _ = client.Decr(key)
}
fr.Get()
signal <- 1
}