---
description: "Learn more about: Warning C26112"
title: Warning C26112
ms.date: 11/04/2016
f1_keywords: ["C26112"]
helpviewer_keywords: ["C26112"]
ms.assetid: 926de738-b9b0-43d7-9137-ab2daa44ad4d
---
# Warning C26112

> Caller cannot hold any lock before calling '*func*'.

The annotation `_Requires_no_locks_held_` imposes a precondition that the caller must not hold any lock while it calls the function. Warning C26112 is issued when a function fails to release all locks before it calls another function.

## Example

The following example generates warning C26112 because the `_Requires_no_locks_held_` precondition is violated by the call to `NoLocksAllowed` within the locked section.

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

_Requires_no_locks_held_

void NoLocksAllowed(DATA* p)
{
     // Lock sensitive operations here
}

void LocksHeldFunction(DATA* p)
{
    EnterCriticalSection(&p->cs);
    NoLocksAllowed(p); // Warning C26112
    LeaveCriticalSection(&p->cs);
}
```