
Ch06-Synchronization Tools_part3
Authored by 徐leo 徐leo
Computers
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9 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下列對於monitor的描述,何者有誤?
屬於高階語言解決同步方法
可以達到互斥的效果
屬於硬體指令
若Process暫時無法進 入monitor,會先到entry queue
等待。
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
為何需要在monitor中加入條件變數(Condition variable)?
為了要達到互斥的目的。
為了解決已經進入monitor的process,因為某種條件限制而無法繼續執行的問題。
為了避免bounded waiting問題發生。
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
以下對於monitor中的條件變數(Condition variable)描述,何者有誤?
是為了解決進入monitor的process可能因為某種條件,造成霸佔資源的狀況。
透過wait( )和signal( )來操作condition variable
condition variable的數量只能有一個。
4.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
在monitor中使用Condition Variable時,當發生2個Process同時在monitor時的解決方法為何?(複選)
Continue and wait
Signal and wait
Signal and Continue
5.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Monitor中需要Block process的時機點為何? (複選)
當Process呼叫x.wait( )時
Process 要進入已經有process在使用的monitor
當Process呼叫x.signal( ),採取「Signal and Continue」時
當Process呼叫x.signal( ),採取「Signal and wait」時
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
以下對於使用Semaphore實現monitor的做法,何者有誤?
Process 進入 monitor 前,必須先呼叫wait (mutex)。
當Process進入monitor後,若發現需等待某條件才能執行,可以呼叫x.wait( )進入blocked。
當Process執行完CS後,會先呼叫x.signal( )
當Process執行完CS後,會直接呼叫signal(mutex)。
7.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
以下哪一個狀況會造成Indefinite waiting?(複選)
飢餓現象 (Starvation)
護衛效應(Convoy Effect)
死結 (deadlock)
優先權倒置 (Priority inversion)
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