race condition solved demo

tmpbook · tmpbook · commit 73c2624fc0c8 · 2018-01-23T01:06:16.000+08:00
diff --git a/race-condition/solved/1000Goroutines.go b/race-condition/solved/1000Goroutines.go
@@ -0,0 +1,30 @@
+package main
+
+import (
+	"fmt"
+	"sync"
+)
+
+// N 是内存里的一个对象
+var (
+	N         = 0
+	mutex     sync.Mutex // +
+	waitgroup sync.WaitGroup
+)
+
+func counter(number *int) {
+	mutex.Lock() // ++
+	*number++
+	mutex.Unlock() // +++
+	waitgroup.Done()
+}
+
+func main() {
+
+	for i := 0; i < 1000; i++ {
+		waitgroup.Add(1)
+		go counter(&N)
+	}
+	waitgroup.Wait()
+	fmt.Println(N)
+}
