1. Why is the following not ideal? /* implementation of a lock */ void lock () { DisableInterrupts (); } void unlock (0 { EnableInterrupts (); } /* a process that accesses some shared data */ Process { lock_t mutex; lock (&mutex); /* begin accessing shared data */ .. /* end accessing shared data */ unlock (&mutex); } 2. Why is the following not ideal? boolean test_and_set (boolean *target) boolean rv = *target; *target = TRUE; %3D return rv: } do { while (test_and_set (&lock)) ; /* do nothing */ /* critical section */ lock = false; /* remainder section */ } while (true);