C programming

5. Besides the busy waiting option to implement semaphore, what is the other option to implement semaphore? Following is the sudo code using test and_set) to implement this option. Please finish the sudo code by filing all the ??'s and explain the pros and cons of these two options. #define bool int # define true 1 #define false 0 bool guard-false; int semaphore_value 0 wait0 II check if the semaphore is accessible or not while (test_ and_set(&guard): if (semaphore value 0) ( // handle the value of guard and current process else i // handle the value of semaphore_value and the value of guard signal) /I check if the semaphore is accessible or not while (??? // check the value of semaphore value and whether a process waits somewhere if (??? wake up the first process in the queue of waiting processes; else guard false