为什么这个脚本挂在命令提示符上

Question

我有下面的脚本，它生成随机序列，并在cpu上用go中的几个线程对它们进行散列。

package main
import(
"fmt"
"crypto/sha256"
"encoding/hex"
"math/rand"
"time"
"log"
"os"
)
func randChr(i int)(string){
i = i + 65
if i>90 {
i = i - 43
}
return string(i)
}
func randStr(random *rand.Rand, length int)(string){
result := ""
for len(result)<length{
result = result + randChr(random.Intn(36))
}
return result
}
func HashPass(data []byte) (bool,[32]byte){
hash := sha256.Sum256(data)
s := hex.EncodeToString(hash[:])
pass := true
for i := 0; i<7; i++ {
if s[i] != s[i+1]{
pass = false
break;
}
}
return pass,hash
}

func getAPassingHash()(string){
randSource := rand.NewSource(time.Now().UnixNano())
random := rand.New(randSource)
passes := false
s := ""
for !passes {
s=randStr(random,64)
passes,_ =  HashPass([]byte(s))
}
return(s)
}
func worker(ch chan string){
ch <- getAPassingHash()
}
func timer(ch chan string,wait time.Duration){
time.Sleep(wait)
ch <- "End"
}
func append(fn string,conts string){
f, err := os.OpenFile(fn,
os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
log.Println(err)
}
defer f.Close()
if _, err := f.WriteString(conts); err != nil {
log.Println(err)
}
}
func main(){
ch := make(chan string)
go timer(ch,6*time.Hour)
for i:=0;i<9;i++{
time.Sleep(time.Second)
go worker(ch)
}
for true{
result := <-ch
if result == "End"{
break;
}
go worker(ch)
fmt.Println(result)
hash := sha256.Sum256([]byte(result))
fmt.Println(hex.EncodeToString(hash[:]))
fmt.Println()
append("hashes.txt","n"+result+"n"+hex.EncodeToString(hash[:])+"n")
}
fmt.Println("done")
}

由于某种原因，脚本偶尔会挂起，直到我单击命令提示符并按enter键。我不确定它在哪里卡住了，但我可以看到我的系统CPU利用率下降了，我知道我有结果以某种方式阻止了程序，我点击回车键，结果打印出来，CPU使用率飙升。我知道这可能很难复制，但我真的很感激任何建议。

Answer 1

它不挂起，它等待passes的值成为真正的

func getAPassingHash()(string){
randSource := rand.NewSource(time.Now().UnixNano())
random := rand.New(randSource)
passes := false
s := ""
for !passes { // wait for value is true
s=randStr(random,64)
passes,_ =  HashPass([]byte(s))
}
return(s)
}