Question

我尝试在我的应用中重现竞争条件，但go build -race并未显示任何错误，即使在装有Linux的虚拟机上也是如此。

机：
Windows：4芯
Linux：2核（通过Vagrant和VirtualBox的Ubuntu Xenial x64）

去版本：
Linux：go version go1.8.3 linux/amd64
Windows：go version go1.8.3 windows/amd64

go env：
Linux：https://pastebin.com/pXURKfj3
Windows：https://pastebin.com/MTdjNnVW

示例1：https://play.golang.org/p/x-eD6bBrzz
示例2：https://play.golang.org/p/FSg8P7UP8p

我的示例是否有数据竞争？根据{{1}}

的构建，它们都没有

如果以上示例没有数据竞争条件，有人可以给我发送示例，我可以在Golang中看到真正的数据竞争，所以我可以测试-race标志吗？我还在网上找到了一些例子，其中一些没有编译，其中一些同样表明没有数据竞争。

谢谢！

Answer 1

您的两个示例都存在数据竞争问题。您可以通过以下方式查找数据竞争。

go run -race program.go
go test -race <package-name>或go test -race -run=<testcase-func-name>
go build -race program.go然后执行程序
go install -race <package-name>然后执行程序

示例1：数据竞赛信息

$ go build -race datarace-try1.go
$ ./datarace-try1
8
==================
WARNING: DATA RACE
Read at 0x00c4200761a8 by goroutine 7:
  main.main.func1()
      /Users/jeeva/go_playground/datarace-try1.go:23 +0x74

Previous write at 0x00c4200761a8 by goroutine 6:
  main.main.func1()
      /Users/jeeva/go_playground/datarace-try1.go:23 +0x8d

Goroutine 7 (running) created at:
  main.main()
      /Users/jeeva/go_playground/datarace-try1.go:25 +0xee

Goroutine 6 (running) created at:
  main.main()
      /Users/jeeva/go_playground/datarace-try1.go:25 +0xee
==================
187410
Found 1 data race(s)

示例2：数据竞赛信息

$ go build -race datarace-try2.go
$ ./datarace-try2
==================
WARNING: DATA RACE
Read at 0x00c420078178 by main goroutine:
  main.main()
      /Users/jeeva/go_playground/datarace-try2.go:10 +0x12e

Previous write at 0x00c420078178 by goroutine 6:
  main.main.func1()
      /Users/jeeva/go_playground/datarace-try2.go:15 +0xd4

Goroutine 6 (finished) created at:
  main.main()
      /Users/jeeva/go_playground/datarace-try2.go:17 +0xf1
==================
==================
WARNING: DATA RACE
Read at 0x00c420078178 by goroutine 7:
  main.main.func2()
      /Users/jeeva/go_playground/datarace-try2.go:20 +0x3f

Previous write at 0x00c420078178 by goroutine 6:
  main.main.func1()
      /Users/jeeva/go_playground/datarace-try2.go:15 +0xd4

Goroutine 7 (running) created at:
  main.main()
      /Users/jeeva/go_playground/datarace-try2.go:23 +0x11d

Goroutine 6 (finished) created at:
  main.main()
      /Users/jeeva/go_playground/datarace-try2.go:17 +0xf1
==================
finish
Found 2 data race(s)
exit status 66

试图在Golang 1.8.3中重现数据竞争

1 个答案: