Increments the lock count of an array, and places a pointer to the array data in pvData of the array descriptor.
All public static (Shared in Visual Basic) members of the SAFEARRAY data type are thread safe. Instance members are not guaranteed to be thread safe.
For example, consider an application that uses the SafeArrayLock and SafeArrayUnlock Function functions. If these functions are called concurrently from different threads on the same SAFEARRAY data type instance, an inconsistent lock count may be created. This will eventually cause the SafeArrayUnlock Function function to return E_UNEXPECTED. You can prevent this by providing your own synchronization code.