1) Some semaphore implementations provide a function getValue() that returns the current value of a semaphore. This function may, for instance, be invoked prior to calling wait() so that a process will only call wait() if the value of the semaphore is > 0, thereby preventing blocking while waiting for the semaphore. For example: if (getValue(&sem) wait (&sem); wwwww > 0) wwww What is the problem in this approach? (5 points) 2) Briefly describe what a reader-writer lock is for and why it can be more efficient than semaphores in some cases. (5 points)