初始化Go学习项目

go-sync-practice/waitgroup_like_latch.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"fmt"
+	"sync"
+	"time"
+)
+
+func worker(id int, wg *sync.WaitGroup) {
+	defer wg.Done()
+	fmt.Printf("worker-%d 开始工作\n", id)
+	time.Sleep(time.Duration(id) * 300 * time.Millisecond)
+	fmt.Printf("worker-%d 完成\n", id)
+}
+
+func main() {
+	var wg sync.WaitGroup
+
+	n := 3
+	wg.Add(n)
+
+	for i := 1; i <= n; i++ {
+		go worker(i, &wg)
+	}
+
+	fmt.Println("main: 等待所有 worker 完成...")
+	wg.Wait()
+	fmt.Println("main: 全部完成")
+}