have two threads that perform a few operations, a mutex mx and a condition
have two threads that perform a few operations, a mutex mx and a condition
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
Transcribed Image Text:Suppose I have two threads that perform a few operations, a mutex mx and a condition variable cond,
as follows:
Thread 1:{
q();
lock(mx);
t();
wait(cond);
unlock(mx);
n();
}
Thread 2:{
lock(mx);
i();
signal(cond);
1();
unlock(mx);
}
Which of the following orderings are possible? Select ALL correct answers (The notation "a→b"
means that the call to a() "happens before" the call to b().)
O one of the threads could block forever, while the other thread finishes
O q>i>l>t→n x
O i>q>l>t→n x
O i>q>t→n→I
O q>i>t→I→n
q→t→i>l»n[
O both threads could block forever
Select all possible options that apply. e
X 0%
Transcribed Image Text:Suppose I have two threads that perform a few operations, a mutex mx and condition variables cond1,
and cond2 as follows:
Thread 1:{
lock(mx);
d();
signal(cond2);
wait(cond1);
p();
unlock(mx);
}
Thread 2:{
lock(mx);
w();
wait(cond2);
k();
signal(cond1);
unlock(mx);
}
Which of the following orderings are possible? Select ALL correct answers (The notation "a→b"
means that the call to a() "happens before" the call to b().)
O both threads could block forever
O w>d→p→k
O d→w→p>k X
V w>d→k→p v
O one of the threads could block forever, while the other thread finishes
O d→w>k→p
O d→p→w→k
Select all possible options that apply.
X 0%
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