为何GOLANG的CHANNEL这么用要报错？

Question

其实我就是希望获取共享变量

 package main

import (
    "fmt"
    //"time"
)

var ch chan bool
var lock chan bool
var msg string

func main() {
    ch = make(chan bool)
    lock = make(chan bool)
    msg = ""
    for i := 0; i < 10; i++ {
        go bingfa(i)
    }
    for j := 0; j < 10; j++ {
        <-ch
    }
    fmt.Println("-------------")
}
func bingfa(i int) {
    lock <- true
    msg = fmt.Sprint(msg, "-", i)
    fmt.Println(msg)
    <-lock
    ch <- true
}

Answer 1

具体错误是什么，是不是你的chan是无缓冲，会死锁

  ch = make(chan boo, 1l)
    lock = make(chan bool, 1)