Go race detector tool

05-race-detector/main.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+ "fmt"
+ "math/rand"
+ "time"
+)
+
+// identify the data race
+// fix the issue.
+
+func main() {
+ start := time.Now()
+ reset := make(chan bool)
+ // var t *time.Timer
+ t := time.AfterFunc(randomDuration(), func() {
+ fmt.Println(time.Since(start))
+ reset <- true
+ })
+ for time.Since(start) < 5*time.Second {
+ <-reset
+ t.Reset(randomDuration())
+ }
+}
+
+func randomDuration() time.Duration {
+ return time.Duration(rand.Int63n(1e9))
+}
+
+//----------------------------------------------------
+// (main goroutine) -> t <- (time.AfterFunc goroutine)
+//----------------------------------------------------
+// (working condition)
+// main goroutine..
+// t = time.AfterFunc() // returns a timer..
+
+// AfterFunc goroutine
+// t.Reset() // timer reset
+//----------------------------------------------------
+// (race condition- random duration is very small)
+// AfterFunc goroutine
+// t.Reset() // t = nil
+
+// main goroutine..
+// t = time.AfterFunc()
+//----------------------------------------------------