Ch06-Synchronization Tools_part01
Quiz
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Computers
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University
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Practice Problem
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Hard
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9 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Process有分independent processes 和 cooperation processes,請問那一種會發生race condition?
independent processes
cooperation processes
2.
MULTIPLE SELECT QUESTION
1 min • 1 pt
cooperation processes發生race condition,主要原因是(複選)
processes的執行順序無法確定
優先權低的process永遠搶不到資源
processes共享記憶體變數
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
造成cooperation processes執行順序無法確定的主要原因是?
CPU number
Interrupt
Memory size
4.
MULTIPLE SELECT QUESTION
1 min • 1 pt
為何我們不直接關閉interrupt 解決race condition? (複選)
Interrupt無法關閉
關閉interrupt方法,在多核心CPU下不適用
關閉interrupt指令只能在Kernel mode執行,User 不能在程式直接呼叫
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
下面哪一個不是硬體支援processes做同步的選項
Peterson’s solution
Hardware instructions
Atomic variables
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Peterson’s solution 中有一個指令順序被編譯器重新排序,導致無法解決Race condition問題,請問可以用何種方式解決?
Memory barriers
Hardware instructions
Atomic variables
7.
MULTIPLE SELECT QUESTION
1 min • 1 pt
以下哪一個是屬於atomic hardware instructions(複選)
memory barrier()
test_and _ set()
compare_and_swap()
8.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
以下對於單元變數 (Atomic variables)描述,何者有錯?
可以對變數進行atomic operation,即存取變數過程不被中斷,以達到互斥
使用special functions 如 Increment ( )
可以透過memory barrier實踐
9.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
以下哪一種同步工具可以滿足解決CS的3個條件
Peterson’s solution
Memory barriers
Hardware instructions
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