init commit

archive/go/atomic/atomic.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+func main() {
+	t := time.Now()
+	sum := int64(0)
+	for i := int64(0); i < 500000000; i++ {
+		sum += i
+	}
+	t1 := time.Now().Sub(t)
+	println(sum)
+	println(t1.String())
+	//锁
+	t = time.Now()
+	sum = 0
+	var mutex sync.Mutex
+	for i := int64(0); i < 500000000; i++ {
+		mutex.Lock()
+		sum += i
+		mutex.Unlock()
+	}
+	t1 = time.Now().Sub(t)
+	println(sum)
+	println(t1.String())
+	//原子操作
+	t = time.Now()
+	sum = 0
+	for i := int64(0); i < 500000000; i++ {
+		atomic.AddInt64(&sum, i)
+	}
+	t1 = time.Now().Sub(t)
+	println(sum)
+	println(t1.String())
+}