Q27

A multithreaded program $P$ executes with $x$ number of threads and uses $y$ number of locks for ensuring mutual exclusion while operating on shared memory locations. All locks in the program are non-reentrant, i.e., if a thread holds a lock $l$, then it cannot re-acquire lock $l$ without releasing it. If a thread is unable to acquire a lock, it blocks until the lock becomes available. The minimum value of $x$ and the minimum value of $y$ together for which execution of $P$ can result in a deadlock are: