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C26165

Visual Studio 2012

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.

Example

The following code generates warning C26165.

C++

_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.

C++

_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);
}

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