38 lines
806 B
Go
38 lines
806 B
Go
package main
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import (
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"fmt"
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"runtime"
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"sync"
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"time"
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)
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func main() {
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runtime.GOMAXPROCS(1) // 单 P 放大抢占效果
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var wg sync.WaitGroup
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wg.Add(2)
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// 长耗时 CPU 任务（超 10ms 抢占阈值）
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go func() {
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defer wg.Done()
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start := time.Now()
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counter := 0
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for time.Since(start) < 50*time.Millisecond {
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counter++ // 无主动让出 P，触发 sysmon 抢占
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}
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fmt.Printf("长耗时任务结束，累计计数：%d\n", counter)
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}()
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// 普通任务（验证调度公平性）
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go func() {
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defer wg.Done()
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for i := 0; i < 10; i++ {
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fmt.Printf("普通任务执行第 %d 次（%v）\n", i+1, time.Now().Format("15:04:05.000"))
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time.Sleep(1 * time.Millisecond)
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}
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}()
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wg.Wait()
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fmt.Println("验证完成：sysmon 触发协程抢占，普通任务未被阻塞")
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}
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