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在某嵌入式操作系统中,若P、V操作的信号量S的初值为2,当前值为-1,则表示等待信号量S的任务个数为(48)。
A.0
B.1
C.2
D.3
A.0
B.1
C.2
D.3
A.在嵌入式微处理器当中,都配备有存储管理单元MMU
B.在嵌入式系统中,内核空间和用户空间必须是两个相互独立的地址空间
C.在有些嵌入式系统中,甚至不提供存储管理功能
D.在虚存系统中,只要磁盘空间无限大,任务就能拥有任意大的编址空间
An embedded operating system is the(71)program that manages all the other programs in an embedded device after initial load of programs by a(an)(72). It normally guarantees a capability within a specified(73)size and(74)constraint as well as with application programs. It also n0rmalty has small foot print including initial boot loader, OS kernel, required device drivers,(75)for the user data and so forth. It has very-likely structure of a normal operating system however mainly differentiated by some factors such as type of pre-installed device, functional limits, taking designed job only.
A.hardware
B.business
C.software
D.external
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