+ 3) Considering the first reader-writer solution below, please explain which semaphores that readers and writers are waiting on when there is a writer in inside the Critical Section updating shared data. (5 points) Writer Reader do { wait (rw mutex); do { wait (mutex); read count++; /* writing is performed */ if (read count == 1) wait (w mutex); signal (w mutex); signal (mutex) } while (true); ... /* reading is performed */ wait (mutex); read count--; if (read count == 0) signal (w mutex); signal (mutex); } while (true);