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計算機結構與作業系統(B)

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國立臺灣大學 2022 · 考試 · 第 8 題

(4 pts) The UNIX system call wait() returns the process identifier of a terminated child process. Select correct description(s).

（複選；至少一個正確選項，每個選項獨立計分。）

(A)
Cascading termination means that "if a process terminates, then all its children must also be terminated."
(B)
The process identifier of a zombie process is released even if its parent has not yet invoked wait().
(C)
If there is no child process when wait() is invoked, then it is as if no wait() is there.
(D)
If there is an orphan process, the system can assign a process as the new parent which periodically invokes wait().

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