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description Learn more about: C26165
title C26165
ms.date 11/04/2016
ms.topic reference
f1_keywords
C26165
helpviewer_keywords
C26165
ms.assetid a1d89bd6-08f3-4215-8a0c-b8ecfeb0cffc

C26165

warning C26165: Possibly failing to release lock <lock> in function <func>.

Warning C26165 resembles warning C26115 except that the confidence level is lower. For example, the function may contain annotation errors.

Examples

The following code generates warning C26165.

_Create_lock_level_(LockLevelOne);
_Create_lock_level_(LockLevelTwo);

struct LockLevelledStruct
{
    _Has_lock_level_(LockLevelOne) CRITICAL_SECTION a;
    _Has_lock_level_(LockLevelTwo) CRITICAL_SECTION b;
};

_Lock_level_order_(LockLevelOne, LockLevelTwo);

_Acquires_lock_(s->b) void GetLockFunc(LockLevelledStruct* s)
{
    EnterCriticalSection(&s->b);
}

void testLockLevelledStruct(LockLevelledStruct* s) // Warning C26165
{
    EnterCriticalSection(&s->a);
    GetLockFunc(s);
    LeaveCriticalSection(&s->a);
}

To correct this warning, change the previous example to the following.

_Create_lock_level_(LockLevelOne);
_Create_lock_level_(LockLevelTwo);

struct LockLevelledStruct
{
    _Has_lock_level_(LockLevelOne) CRITICAL_SECTION a;
    _Has_lock_level_(LockLevelTwo) CRITICAL_SECTION b;
};

_Lock_level_order_(LockLevelOne, LockLevelTwo);

_Acquires_lock_(s->b) void GetLockFunc(LockLevelledStruct* s)
{
    EnterCriticalSection(&s->b);
}

_Releases_lock_(s->b) void ReleaseLockFunc(LockLevelledStruct* s)
{
    LeaveCriticalSection(&s->b);
}

void testLockLevelledStruct(LockLevelledStruct* s) // OK
{
    EnterCriticalSection(&s->a);
    GetLockFunc(s);
    ReleaseLockFunc(s);
    LeaveCriticalSection(&s->a);
}