go - 最简单的 Go 竞争条件示例？

Question

我需要一个简单的 Go 代码示例，它肯定会使程序进入竞争状态。

有什么想法吗？

Answer 1

原问题:

I need a simple Go code sample which will definitely run the program into an race-condition.

---

例如，

racer.go:

package main

import (
    "time"
)

var count int

func race() {
    count++
}

func main() {
    go race()
    go race()
    time.Sleep(1 * time.Second)
}

输出:

$ go run -race racer.go
==================
WARNING: DATA RACE
Read at 0x00000052ccf8 by goroutine 6:
  main.race()
      /home/peter/gopath/src/racer.go:10 +0x3a

Previous write at 0x00000052ccf8 by goroutine 5:
  main.race()
      /home/peter/gopath/src/racer.go:10 +0x56

Goroutine 6 (running) created at:
  main.main()
      /home/peter/gopath/src/racer.go:15 +0x5a

Goroutine 5 (finished) created at:
  main.main()
      /home/peter/gopath/src/racer.go:14 +0x42
==================
Found 1 data race(s)
exit status 66
$