Re: [理工] [OS] 交大100
看板Grad-ProbAsk作者undefeated11 (Carmelo)時間12年前 (2012/02/21 17:07)推噓1(1推 0噓 10→)留言11則, 4人參與討論串3/3 (看更多)
: 題目太長了，請看圖片
: 答案CDE
: 14題
: alloc max need 系統原有
: A B C A B C A B C A B C
: p0 0 1 0 7 5 3 6 4 3 10 5 7
: 1 2 0 0 3 2 2 1 2 2 alloc後剩
: 2 3 0 2 9 0 2 6 0 0 3 3 2
: 3 2 1 1 2 2 2 0 1 1
: 4 0 0 2 4 3 3 4 3 1
: if p1 request additional A = 1 , C = 2
: 此時系統剩下 A2 B3 C0
: 但是P3需要0 1 1 為什麼CD可以選
: B選項 分配 0 2 0 給P0 系統剩下 2 1 0 < 所有的need
: 為什麼B沒有呢
交大101 OS
Allocation Max Need Available
A B C A B C A B C A B C
P0 2 1 1 3 1 3 1 0 2 2 0 2
P1 0 1 1 3 2 1 3 1 0
P2 1 0 0 1 0 4 0 0 4
P3 0 1 2 2 1 2 2 0 0
P4 1 0 0 1 1 0 0 1 0
Which of the following statements are correct?
(a)<P4,P3,P2,P0,P1>is a safe sequence.
(b)<P3,P0,P1,P4,P2>is a safe sequence.
(c)<P0,P1,P2,P3,P4>is a safe sequence.
(d)<P0,P2,P3,P4,P1>is a safe sequence.
(e)There is no safe sequence.
Ans:(b)(c)
請問為什麼100年那題答案是CDE
這題卻不能全選
有點搞混了
麻煩幫忙解惑 謝謝
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