首次提交：初始化项目代码

concurrent_safe_demo.go

@@ -0,0 +1,68 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"sync"
+	"time"
+)
+
+// SafeWriter 线程安全的Writer封装
+type SafeWriter struct {
+	writer *os.File
+	mu     sync.Mutex // 互斥锁，保护Writer写入
+}
+
+// NewSafeWriter 创建SafeWriter实例
+func NewSafeWriter(filename string) (*SafeWriter, error) {
+	file, err := os.OpenFile(filename,
+		os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
+	if err != nil {
+		return nil, err
+	}
+	return &SafeWriter{writer: file}, nil
+}
+
+// Writef 线程安全的格式化写入
+func (w *SafeWriter) Writef(format string, args ...interface{}) error {
+	w.mu.Lock()         // 加锁，独占写入权
+	defer w.mu.Unlock() // 函数退出自动解锁
+
+	// 拼接日志前缀（时间）+ 格式化内容
+	logContent := fmt.Sprintf("[%s] %s\n",
+		time.Now().Format("2006-01-02 15:04:05"),
+		fmt.Sprintf(format, args...))
+
+	// 写入文件（用WriteString比Fprintf更高效）
+	_, err := w.writer.WriteString(logContent)
+	return err
+}
+
+// Close 关闭文件
+func (w *SafeWriter) Close() error {
+	return w.writer.Close()
+}
+
+func main() {
+	writer, err := NewSafeWriter("concurrent.log")
+	if err != nil {
+		fmt.Printf("SafeWriter创建失败：%v\n", err)
+		return
+	}
+	defer writer.Close()
+
+	var wg sync.WaitGroup
+	// 10个goroutine并发写入（每个写10条）
+	for i := 0; i < 10; i++ {
+		wg.Add(1)
+		go func(goroutineID int) {
+			defer wg.Done()
+			for j := 0; j < 10; j++ {
+				writer.Writef("goroutine%d：完成第%d条任务", goroutineID, j)
+			}
+		}(i)
+	}
+
+	wg.Wait()
+	fmt.Println("10个goroutine并发写入完成，内容无错乱")
+}