操作系统解决进程间的(16)问题,常常运用对信号量进行(17)的低级(18)来实现。例如,为保证系统数据
操作系统解决进程间的(16)问题,常常运用对信号量进行(17)的低级(18)来实现。例如,为保证系统数据库的完整性,可以将信号量定义为某个库文件(或记录)的锁,初值为1。任何进程访问该库文件(或记录)之前,首先对它做一个(19),访问之后,对它做一个(20),从而保证任一时刻正在访问该文件(或记录)的进程至多只有一个。
A.同步与异步
B.串行与并行
C.同步与互斥
D.调度与控制
操作系统解决进程间的(16)问题,常常运用对信号量进行(17)的低级(18)来实现。例如,为保证系统数据库的完整性,可以将信号量定义为某个库文件(或记录)的锁,初值为1。任何进程访问该库文件(或记录)之前,首先对它做一个(19),访问之后,对它做一个(20),从而保证任一时刻正在访问该文件(或记录)的进程至多只有一个。
A.同步与异步
B.串行与并行
C.同步与互斥
D.调度与控制
此题为判断题(对,错)。
System analysis is traditionally done top-down using structured analysis based on (71) .Object-oriented analysis focuses on creation of models.The three types of the analysis model are (72) .There are two substages of object-oriented analysis. (73) focuses on real-world things whose semantics the application captures.The object constructed in the requirement analysis shows the (74) of the real-world system and organizes it into workable pieces. (75) addresses the computer aspects ofthe application that are visible to users.The objects are those which can be expected to vary from time to time quite rapidly.
(71)
A.functional decomposition
B.object abstraction
C.data inheritance
D.information generalization
(24)
A.形式化
B.迭代式
C.瀑布式
D.交互式
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