Consider the following implementation of a container that will be used in concurrent environment. The container suppose to be used like an index array, but provided thread safe access to element.

struct concurrent containe //assume it's called for any new instance once before it's ever used void construct (int N) init mutex (&lock) resize (N) // returns element by its index. int get (int index) lock.acquire ) if (index size) return-INT MAX int result = data [index]; lock.release) return result: struct concurrent containe //assume it's called for any new instance once before it's ever used void construct (int N) init mutex (&lock) resize (N) // returns element by its index. int get (int index) lock.acquire ) if (index size) return-INT MAX int result = data [index]; lock.release) return result