初始化Go学习项目

go-context-practice/cancel_basic.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"time"
+)
+
+// 模拟一个可被取消的循环任务
+func worker(ctx context.Context, name string) {
+	for {
+		select {
+		case <-ctx.Done():
+			fmt.Println(name, "收到取消信号:", ctx.Err())
+			return
+		default:
+			fmt.Println(name, "还在干活...")
+			time.Sleep(500 * time.Millisecond)
+		}
+	}
+}
+
+func main() {
+	ctx, cancel := context.WithCancel(context.Background())
+
+	go worker(ctx, "worker-1")
+	go worker(ctx, "worker-2")
+
+	time.Sleep(2 * time.Second)
+	fmt.Println("main: 决定取消所有 worker")
+	cancel() // 发出取消信号
+
+	time.Sleep(1 * time.Second)
+	fmt.Println("main 结束")
+}