33 lines
593 B
Go
33 lines
593 B
Go
package main
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import (
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"fmt"
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"os"
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"runtime"
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"time"
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)
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func main() {
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runtime.GOMAXPROCS(1) // 限制为1个P，便于观察Hand-off效果
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ch := make(chan bool)
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go func() {
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fmt.Println("Goroutine: performing blocking syscall (file read)")
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_, err := os.ReadFile("dev/urandom") // 阻塞式文件I/O
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if err != nil {
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fmt.Println("Error:", err)
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}
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fmt.Println("Goroutine: syscall completed")
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ch <- true
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}()
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// 主Goroutine持续执行，证明调度未停滞
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for i := 0; i < 5; i++ {
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fmt.Printf("Main: iteration %d\n", i)
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time.Sleep(50 * time.Millisecond)
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}
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<-ch
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}
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