Deadlocks: The deadlock denotes a situation where a collection of threads remains blocked. It denotes waiting for a condition that would never be true. The progress graph denotes invaluable tool for understanding deadlock. If “P” and “V” operations are been ordered incorrectly, the forbidden regions for two semaphores would overlap. If any execution trajectory reaches deadlock state “d” then no further progress will be possible. In this case each thread waits for the other one for a “V” operation that never occurs. The overlapping forbidden regions would induce a set of states called “deadlock region”. The deadlock is inevitable is trajectory touches a state in deadlock region. Once it enters deadlock regions, the trajectories could never leave. Mutex lock ordering rule: A program is deadlock-free if each thread acquires its mutexes in order. It releases them in reverse order and given a total ordering for all mutexes. The mutex should be achieved in order to ensure deadlock free scheme.

Question

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Answer 1

Question

Chapter 12, Problem 12.30HW

A.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, the forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The overlapping forbidden regions would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

B.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, the forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The overlapping forbidden regions would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

C.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The forbidden regions that are overlapping would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

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Answer 2

Question

Chapter 12, Problem 12.30HW

A.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, the forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The overlapping forbidden regions would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

B.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, the forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The overlapping forbidden regions would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

C.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The forbidden regions that are overlapping would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

Expert Solution & Answer

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See solution

Answer 3

Question

Chapter 12, Problem 12.30HW

A.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, the forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The overlapping forbidden regions would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

B.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, the forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The overlapping forbidden regions would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

C.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The forbidden regions that are overlapping would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

Expert Solution & Answer

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Answer 4

Question

Chapter 12, Problem 12.30HW

A.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, the forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The overlapping forbidden regions would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

B.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, the forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The overlapping forbidden regions would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

C.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The forbidden regions that are overlapping would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

Expert Solution & Answer

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See solution

Answer 5

Chapter 12, Problem 12.30HW

A.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, the forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The overlapping forbidden regions would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

B.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, the forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The overlapping forbidden regions would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

C.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The forbidden regions that are overlapping would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

Answer 6

Chapter 12, Problem 12.30HW

A.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, the forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The overlapping forbidden regions would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

Answer 7

Chapter 12, Problem 12.30HW

A.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, the forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The overlapping forbidden regions would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

Answer 8

B.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, the forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The overlapping forbidden regions would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

Answer 9

B.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, the forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The overlapping forbidden regions would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

Answer 10

C.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The forbidden regions that are overlapping would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

Answer 11

C.

Program Plan Intro

Deadlocks:

The deadlock denotes a situation where a collection of threads remains blocked.

It denotes waiting for a condition that would never be true.

The progress graph denotes invaluable tool for understanding deadlock.

If “P” and “V” operations are been ordered incorrectly, forbidden regions for two semaphores would overlap.

If any execution trajectory reaches deadlock state “d” then no further progress will be possible.

In this case each thread waits for the other one for a “V” operation that never occurs.

The forbidden regions that are overlapping would induce a set of states called “deadlock region”.

The deadlock is inevitable is trajectory touches a state in deadlock region.

Once it enters deadlock regions, the trajectories could never leave.

Mutex lock ordering rule:

A program is deadlock-free if each thread acquires its mutexes in order.

It releases them in reverse order and given a total ordering for all mutexes.

The mutex should be achieved in order to ensure deadlock free scheme.

Answer 12

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Answer 13

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Answer 14

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Answer 15

Ch. 12.1 - Prob. 12.1PP Ch. 12.1 - Prob. 12.2PP Ch. 12.2 - Practice Problem 12.3 (solution page 1036) In...Ch. 12.2 - Practice Problem 12.4 (solution page 1036) In the...Ch. 12.4 - Prob. 12.5PP Ch. 12.4 - Prob. 12.6PP Ch. 12.5 - Prob. 12.7PP Ch. 12.5 - Prob. 12.8PP Ch. 12.5 - Prob. 12.9PP Ch. 12.5 - Prob. 12.10PP

Solution Summary: The author explains that deadlock is a situation where threads remain blocked. If "P" and "V" operations are ordered incorrectly, the forbidden regions for two semaphores would overlap.

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Chapter 12 Solutions