# 警告：数据竞争：协程X写入，协程Y读取（闭包变量）

- **ID:** `go/goroutine-race-on-closure-variable`
- **领域:** go
- **类别:** runtime_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

协程闭包通过引用捕获循环变量，导致多个协程竞争同一个变量。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 1.0 | active | — | — |
| 1.22 | active | — | — |

## 解决方案

1. **Pass loop variable as argument to goroutine** (99% 成功率)
   ```
   for i := 0; i < 10; i++ {
    go func(val int) {
        fmt.Println(val)
    }(i)
}
   ```
2. **Create local copy within loop** (98% 成功率)
   ```
   for i := 0; i < 10; i++ {
    val := i
    go func() {
        fmt.Println(val)
    }()
}
   ```

## 无效尝试

- **Adding time.Sleep in loop to stagger goroutines** — Race condition still exists; timing-dependent fix unreliable. (90% 失败率)
- **Using global variable instead of local** — Global variable is shared; race condition worsens. (80% 失败率)