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Ch4 行程與執行緒管理
第 29 題／共 70 題
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29. Process Control Block、Interrupts、init process、System Calls
#OS-04-029
中
Process Control Block
Interrupts
init process
System Calls
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Which of the following statements on process is (are) true?
A
(a) A process control block serves as the repository for all the data needed to start, or restart, a process. It contains scheduling information, local variables and kernel data structure.
B
(b) Interrupts cause the operating system to change a CPU core from its current task and to run a kernel routine. The system needs to save the current context of the process running on the CPU core so that it can restore that context when its processing is done.
C
(c) Traditional UNIX systems identify the init process as the root of all child processes. In UNIX systems, a process clones itself to create new processes. Thus, all the processes in the system are the descendants of the init process, either directly or indirectly.
D
(d) A user program must use system calls to access files stored in storage devices. But a program can directly access the allocated heap data from memory without the help from operating systems.
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