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title Warning C26165
description Learn more about: Warning C26165
ms.date 11/04/2016
f1_keywords
C26165
helpviewer_keywords
C26165

Warning C26165

Possibly failing to release lock 'lock' in function 'func'.

Remarks

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);
}