Ans wait s while s 0 s signal s s 28 explain the

Ans: wait (S) {
while (S <= 0);
S--;
}
signal (S) {
S++;
28. Explain the difference between the first readers–writers problem and the second readers–-writers problem. 29. Describe the dining-philosophers problem and how it relates to operating systems. 30. What is the difference between software transactional memory and hardware transactional memory?
a
Maha Otaibi
٢۲٢۲

31. Assume you had a function named update() that updates shared data. Illustrate how a mutex lock named mutex might be used
to prevent a race condition in update().
32. Describe the turnstile structure used by Solaris for synchronization.
33. Explain the role of the variable preempt_count in the Linux kernel.