---
description: "Learn more about: Warning C26140"
title: Warning C26140
ms.date: 11/04/2016
f1_keywords: ["C26140"]
helpviewer_keywords: ["C26140"]
ms.assetid: a0b521b4-0c2f-470a-8904-f7bbb8014536
---
# Warning C26140

> Undefined lock kind '*lock*' in annotation '*annotation*' on lock '*lock*'.

## Example

```cpp
_Has_lock_kind_(MUTEXa) HANDLE gMutex;

struct CorrectExample
{
    _Has_lock_kind_(_Lock_kind_mutex_) HANDLE mMutex;
    _Guarded_by_(mMutex) int mData;
};

_When_(return == WAIT_OBJECT_0 || return == WAIT_ABANDONED, _Acquires_lock_(gMutex))
DWORD UndefinedLockKind() // Warning C26140
{
    DWORD result = WaitForSingleObject(gMutex, 1000);
    return result;
}
```