Rich Pte Ltd has gone into insolvent liquidation. The company has a factory in Singapore. Beng owns 10,000 ordinary shares in Rich Pte Ltd, which are paid up to 50%. The company owes;(i) $130,000 in unpaid wages to employees,(ii) $200,000 in respect of goods bought on credit,(iii) $1 million to a bank supported by a fixed charge over the land on which the factory is built.Required:

(b) Explain the order of priority for payment of the debts owed by Rich Pte Ltd. (7 marks)

实现一个经典的“读者-写者”算法时，若当前临界区中有读者访问，写者再来时必须在临界区外面等候，如果其后读者源源不断地到达，按策略他们均可以进入临界区，始终保持临界区中有读者访问，那么写者可能长时间不能进入临界区而形成饥饿。为解决此类问题，我们修改访问策略，要求当写者到达时，写者具有优先权。具体说，写者到达后，已经在临界区内的读者继续读取直到结束，而后来的读者就不能进入临界区。等所有的读者离开临界区以后让写者先进去访问，然后等写者离开后再允许读者进入临界区。这所谓“写者优先读者-写者”问题。请用信号量和PV操作来描述这一组进程的工作过程。