How does Go decide use which "raceenabled" (race.go or race0.go)?

[Nan Xiao]

Hi,

I am reading waitgroup.go code, and find it uses "raceenabled". I also find raceenabled in both "race.go" 

and "race0.go" (one is "true", while the other is "false").  How do I know which one is my Go program use? 

Thanks in advance!

Best Reagrds

Nan Xiao

[Andrew Gerrand]

The raceenabled boolean is true when the race detector is enabled.

If you look at the top of each file, you can see that race.go has the line

  // +build race

and race0.go has the line

  // +build !race

This means that the former file will be compiled when the "race" build tag is set, and the other will be compiled when the "race" tag is not set.

Compiling your code with the race detector enabled (by passing the -race flag to the go tool) will cause that build tag to be set.

More detail on the race detector:

  http://blog.golang.org/race-detector

Andrew

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[Nan Xiao]

Got it! Thanks very much for your answer!

Best Regards

Nan Xiao

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