---
description: "Learn more about: Warning C26111"
title: Warning C26111
ms.date: 11/04/2016
f1_keywords: ["C26111"]
helpviewer_keywords: ["C26111"]
ms.assetid: 85fc740a-3bbb-41b8-a848-95e243a08da9
---
# Warning C26111

> Caller failing to release lock '*lock*' before calling function '*func*'.

The annotation `_Requires_lock_not_held_` imposes a precondition that the lock count for the specified lock can't be greater than zero when the function is called. Warning C26111 is issued when a function fails to release the lock before it calls another function.

## Example

The following example generates warning C26111 because the `_Requires_lock_not_held_` precondition is violated by the call to `DoNotLock` within the locked section.

```cpp
typedef struct _DATA
{
    CRITICAL_SECTION cs;
    int d;
} DATA;

_Requires_lock_not_held_(p->cs)

void DoNotLock(DATA* p)
{
    EnterCriticalSection(&p->cs);
    p->d = 0;
    LeaveCriticalSection(&p->cs);
}

void LockedFunction(DATA* p)
{
    EnterCriticalSection(&p->cs);
    DoNotLock(p); // Warning C26111
    LeaveCriticalSection(&p->cs);
}
```