From d5514795f06a02086a51285d0d58d33de041e20a Mon Sep 17 00:00:00 2001
From: Jian Han <jianhan@mail.com>
Date: Wed, 10 Jan 2018 23:06:03 +1000
Subject: [PATCH] added race detactor

---
 concurrency/race_detection/main.go | 61 ++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 concurrency/race_detection/main.go

diff --git a/concurrency/race_detection/main.go b/concurrency/race_detection/main.go
new file mode 100644
index 0000000..77299bc
--- /dev/null
+++ b/concurrency/race_detection/main.go
@@ -0,0 +1,61 @@
+package main
+
+import (
+	"fmt"
+	"math/rand"
+	"runtime"
+	"sync"
+	"time"
+)
+
+var balance int
+var transacitonNo int
+
+func main() {
+	rand.Seed(time.Now().Unix())
+	runtime.GOMAXPROCS(2)
+	var wg sync.WaitGroup
+	tranChan := make(chan bool)
+	balance = 1000
+	transacitonNo = 0
+	fmt.Println("Start balance: $", balance)
+	wg.Add(1)
+	for i := 0; i < 100; i++ {
+		go func(ii int, trChan chan (bool)) {
+			transactionAmount := rand.Intn(25)
+			transaction(transactionAmount)
+			if ii == 99 {
+				trChan <- true
+			}
+		}(i, tranChan)
+	}
+	go transaction(0)
+	select {
+	case <-tranChan:
+		fmt.Println("Transaction Finished")
+		wg.Done()
+	}
+	wg.Wait()
+	close(tranChan)
+	fmt.Println("Finial balance : $", balance)
+}
+
+func transaction(amt int) bool {
+	approved := false
+	if balance-amt < 0 {
+		approved = false
+	} else {
+		approved = true
+		balance = balance - amt
+	}
+	approvedText := "declined"
+	if approved {
+		approvedText = "approved"
+	} else {
+
+	}
+	transacitonNo = transacitonNo + 1
+	fmt.Println(transacitonNo, "Transaction For $", amt, approvedText)
+	fmt.Println("\nRemaining Balance $", balance)
+	return approved
+}