package main

import (
	"fmt"
	"runtime"
	"time"
)

func main() {
	runtime.GOMAXPROCS(1) // 模拟调度压力

	// 10ms 后到期的定时器
	timer := time.AfterFunc(10*time.Millisecond, func() {
		fmt.Println("定时器回调执行：sysmon 兜底触发")
	})
	defer timer.Stop()

	// 长耗时任务阻塞调度器
	start := time.Now()
	counter := 0
	for time.Since(start) < 50*time.Millisecond {
		counter++
	}
	fmt.Printf("长耗时任务结束，累计计数：%d\n", counter)

	time.Sleep(5 * time.Millisecond)
	fmt.Println("验证完成：定时器回调精准执行")
}