历年操作系统考研真题

P(mutexB)

send the mail to B； V(mutexB); V(emptyB); } } B{

While(TRUE){ P(fullB); P(mutexB)

Get a mail from B_mailbox； V(mutexB); V(fullB);

Answer the question and raise a question; P(emptyA); P(mutexA)

send the mail to A； V(mutexA); V(emptyA); } }

Code End

【考查知识点】考察了利用信号量进程同步问题。