Go 언어의 동시 파일에 대한 파일 시스템 액세스 권한 문제를 어떻게 처리합니까?

package main

import (
    "fmt"
    "os"
    "sync"
)

var (
    fileMutex sync.Mutex
)

func writeFile(filename string, data string) {
    fileMutex.Lock()
    defer fileMutex.Unlock()

    file, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0666)
    if err != nil {
        fmt.Println("Failed to open file:", err)
        return
    }
    defer file.Close()

    _, err = file.WriteString(data + "
")
    if err != nil {
        fmt.Println("Failed to write to file:", err)
        return
    }
}

func main() {
    go writeFile("file1.txt", "Content for file 1")
    go writeFile("file2.txt", "Content for file 2")

    // Wait for goroutines to finish
    time.Sleep(time.Second)
}

package main

import (
    "fmt"
    "os"
    "sync"
)

var (
    fileLock sync.RWMutex
)

func readFile(filename string) {
    fileLock.RLock()
    defer fileLock.RUnlock()

    file, err := os.Open(filename)
    if err != nil {
        fmt.Println("Failed to open file:", err)
        return
    }
    defer file.Close()

    data := make([]byte, 1024)
    _, err = file.Read(data)
    if err != nil {
        fmt.Println("Failed to read from file:", err)
        return
    }

    fmt.Println(string(data))
}

func writeFile(filename string, data string) {
    fileLock.Lock()
    defer fileLock.Unlock()

    file, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0666)
    if err != nil {
        fmt.Println("Failed to open file:", err)
        return
    }
    defer file.Close()

    _, err = file.WriteString(data + "
")
    if err != nil {
        fmt.Println("Failed to write to file:", err)
        return
    }
}

func main() {
    go readFile("file1.txt")
    go writeFile("file2.txt", "Content for file 2")

    // Wait for goroutines to finish
    time.Sleep(time.Second)
}