Consider how to implement a mutex lock using the atomic compare_and_swap() hardware instruction (assuming atomic acquire() and release() hardware instructions do NOT exist). The following structure defines the mutex lock, where the value (available == 0) indicates that the mutex lock is available, and a value of 1 (available == 1) indicates that the mutex lock is unavailable. typedef struct {
int available;
}
mutex_lock;

Write C statement(s) to declare and initialize a shared variable named me_lock using the above structure type