若一个单处理器的计算机系统中同时存在3个并发进程，则同一时刻允许占用处理器的进程数（请作答此空）；如果这3个进程都要求使用2个互斥资源R，那么系统不产生死锁的最少的R 资源数为（ ）个。
- A.至少为 1 个
- B.至少为3个
- C.最多为1个
- D.最多为3个
正确答案及解析
正确答案
解析
本题的正确选项为C。因为一个单处理器的计算机系统中尽管同时存在3个并发进程，但是同一时刻允许占用处理器的进程数只能是1个。引入多道程序设计的目的是为了提高资源的利用率，例如进程P1要输入输出时，可以将CPU分配给进程P2，使得进程P1的输入输出和进程P2的程序执行并发运行。
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