Mutex / Detecting races / Essential Go
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// :glot, :name main.go, :run go run -race main.go, :allow error
package main
import (
"fmt"
"runtime"
"sync"
"time"
)
var (
n int
)
func main() {
var wg sync.WaitGroup
nCPU := runtime.NumCPU()
nIter := 100
for i := 0; i < nCPU; i++ {
wg.Add(1)
go func() {
defer wg.Done()
for j := 0; j < nIter; j++ {
n++
time.Sleep(time.Microsecond * 10)
}
}()
}
wg.Wait()
fmt.Printf("n is: %d, expected: %d\n", n, nCPU*nIter)
}
Go
INFO