golang 多线程查找文件内容

package main

import (
    "fmt"
    "io/ioutil"
    "os"
    "path/filepath"
    "strings"
)

var matchCount = 0
var ch = make(chan int, 512)

func findFile(path string, text string) {
    var pathArray [100]string
    var count = 0
    filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
        if err != nil {
        }
        //find text
        if !info.IsDir() {
            if info.Size() < 1024*1024 {
                pathArray[count] = path
                count++
                if count >= 100 {
                    count = 0
                    go findText(pathArray[0:100], text)
                    <-ch
                }
            }
        }
        return nil
    })
    go findText(pathArray[0:count], text)
    <-ch

    fmt.Printf("一共发现了 %d 个匹配的文件", matchCount)

}

func findText(paths []string, text string) {
    for _, path := range paths {
        fi, err := os.Open(path)
        if err != nil {
            panic(err)
        }
        defer fi.Close()
        fd, err := ioutil.ReadAll(fi)
        if err != nil {
            panic(err)
        }

        if strings.Index(string(fd), text) > -1 {
            matchCount++
            fmt.Println(path)
        }
    }
    ch <- 1
}

func main() {
    args := os.Args
    if len(args) < 3 {
        fmt.Println("需要两个参数 path text")
        return
    }
    path := args[1]
    text := args[2]

    _, err := os.Stat(path)

    if err != nil {
        fmt.Println("path不存在")
    } else {
        findFile(path, text)
    }
}

 计数器增加的时候应该加锁