首次提交：初始化项目代码

cas_counter.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"fmt"
+	"sync"
+	"sync/atomic"
+)
+
+func main() {
+	var counter int64
+	var wg sync.WaitGroup
+	const goroutines, increments = 10, 10000
+
+	wg.Add(goroutines)
+	for i := 0; i < goroutines; i++ {
+		go func() {
+			defer wg.Done()
+			for j := 0; j < increments; j++ {
+				for {
+					old := atomic.LoadInt64(&counter)
+					if atomic.CompareAndSwapInt64(&counter, old, old+1) {
+						break // 成功则退出重试循环
+					}
+					// 失败：其他 goroutine 已修改，重试
+				}
+			}
+		}()
+	}
+	wg.Wait()
+	fmt.Printf("✅ 最终计数值: %d (期望: %d)\n", counter, goroutines*increments)
+}