---
description: "Learn more about: Warning C26160"
title: Warning C26160
ms.date: 11/04/2016
f1_keywords: ["C26160"]
helpviewer_keywords: ["C26160"]
ms.assetid: e6518687-36b4-4eae-a732-758881638295
---
# Warning C26160

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

Warning C26160 resembles warning [C26110](../code-quality/c26110.md) except that the confidence level is lower. For example, the function may contain annotation errors.

## Examples

The following code generates warning C26160.

```cpp
struct Account
{
    _Guarded_by_(cs) int balance;
    CRITICAL_SECTION cs;

    _No_competing_thread_ void Init()
    {
        balance = 0; // OK
    }

    _Requires_lock_held_(this->cs) void FuncNeedsLock();

    _No_competing_thread_ void FuncInitCallOk()
        // this annotation requires this function is called
        // single-threaded, therefore we don't need to worry
        // about the lock
    {
        FuncNeedsLock(); // OK, single threaded
    }

    void FuncInitCallBad() // No annotation provided, analyzer generates warning
    {
        FuncNeedsLock(); // Warning C26160
    }

};
```

The following code shows a solution to the previous example.

```cpp
struct Account
{
    _Guarded_by_(cs) int balance;
    CRITICAL_SECTION cs;

    _No_competing_thread_ void Init()
    {
        balance = 0; // OK
    }

    _Requires_lock_held_(this->cs) void FuncNeedsLock();

    _No_competing_thread_ void FuncInitCallOk()
        // this annotation requires this function is called
        // single-threaded, therefore we don't need to worry
        // about the lock
    {
        FuncNeedsLock(); // OK, single threaded
    }

    void FuncInitCallBadFixed() // this function now properly acquires (and releases) the lock
    {
        EnterCriticalSection(&this->cs);FuncNeedsLock();LeaveCriticalSection(&this->cs);
    }
};
```