Computer Systems: A Programmer's Perspective (3rd Edition)
3rd Edition
ISBN: 9780134092669
Author: Bryant, Randal E. Bryant, David R. O'Hallaron, David R., Randal E.; O'Hallaron, Bryant/O'hallaron
Publisher: PEARSON
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Chapter 12.4, Problem 12.5PP
Program Plan Intro
Process-based server:
When a process dismisses for any purpose, the kernel closes all open descriptors. Thus, the child’s copy of the connected descriptor will be automatically closed when the child exits.
- To avoid memory leak, the parent and the child required to close their corresponding copies of “connfd”.
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Solve the following problem in C programming language:
Four threads will run in parallel. The threads have a shared variable x. The initial value of x is equal to 0. The critical section of Thread1 and Thread3 will increment the value of x by 1, while the critical section ofThread2 and Thread4 will decrement the value of x by 2. The program will return the final value of x which will be equal to 2.
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Chapter 12 Solutions
Computer Systems: A Programmer's Perspective (3rd Edition)
Ch. 12.1 - Prob. 12.1PPCh. 12.1 - Prob. 12.2PPCh. 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. 12.5PPCh. 12.4 - Prob. 12.6PPCh. 12.5 - Prob. 12.7PPCh. 12.5 - Prob. 12.8PPCh. 12.5 - Prob. 12.9PPCh. 12.5 - Prob. 12.10PP
Ch. 12.6 - Prob. 12.11PPCh. 12.7 - Prob. 12.12PPCh. 12.7 - Prob. 12.13PPCh. 12.7 - Prob. 12.14PPCh. 12.7 - Prob. 12.15PPCh. 12 - Prob. 12.20HWCh. 12 - Derive a solution to the second readers-writers...Ch. 12 - Prob. 12.22HWCh. 12 - Prob. 12.23HWCh. 12 - Prob. 12.24HWCh. 12 - Prob. 12.25HWCh. 12 - Prob. 12.26HWCh. 12 - Some network programming texts suggest the...Ch. 12 - Prob. 12.28HWCh. 12 - Prob. 12.29HWCh. 12 - Prob. 12.30HWCh. 12 - Implement a version of the standard I/O fgets...Ch. 12 - Prob. 12.32HWCh. 12 - Prob. 12.33HWCh. 12 - Prob. 12.34HWCh. 12 - Prob. 12.35HWCh. 12 - Prob. 12.36HWCh. 12 - Prob. 12.37HWCh. 12 - Prob. 12.38HWCh. 12 - Prob. 12.39HW
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- In your opinion, is it possible for a single threaded process to get blocked in a deadlock state by itself? Specifically, I'd want you to elaborate on the following sentence in your answer.arrow_forwardIn this particular situation, a solution with a single thread is preferable than a solution with several threads.arrow_forwardShow how to use semaphores to construct a scheduler-based n-thread barrier.arrow_forward
- 1. Consider a multi-threaded process with 10 threads. Thread 3 invokes an execlp() system call. Describe what will happen to each of the threads. 2. Suppose in a multithreaded process a thread makes a blocking system call. In which threading model(s) will this certainly result in a process blocking?arrow_forwardIs it possible, in your opinion, for a single threaded process to get deadlocked without affecting any other threads? If you could elaborate on your answer in the following sentence, that would be great.arrow_forwardConsider a multithreaded process that delivers messages from a durable queue of persistent messages. Different threads may run concurrently, attempting to deliver different messages. In case of a delivery failure, the message must be restored in the queue. Model the actions that each thread carries out as a multilevel transaction, so that locks on the queue need not be held until a message is delivered.arrow_forward
- In what scenarios does the employment of several threads give performance that is substandard to a single-threaded approach?arrow_forwarddata comunication A program for communication between server and client will be developed. Multiclients (more than 1 client) can communicate with server simultaneously. While a client communication with the server, another clients should communicate with the server. The communication should be seen in consoles. TCP protocol will be used.. Thread functions should be used for the simultaneous communicationarrow_forwardIn the past, we discussed the fact that each thread running in the JVM is only permitted to have a single method active at any one moment. What leads you to believe that this is the situation in the first place?arrow_forward
- Problem 0. Write a version of hello.c that creates and reaps (joins) n threads, each of which prints "Hello, world" and its thread id, where n is a command-line argument, and the thread function is passed a pointer to its thread ID as its argument.arrow_forwardIn this question, assume a standard system with isolation and memory protection. Further assume that the thread abstraction is implemented by the operating system. That is, thread_create() is a system call. 1. What do you think are the differences between the implementation of thread_create(func) and the implementation of fork()? (here, func is the address of the function that the thread should begin at). 2. What do you think are the key differences between the OS's "process" data structure and whatever data structure it uses to implement a thread?arrow_forwardAt the moment, work is being done by a thread with the priority 30. If (a) it used up all of its time quantum, what would be its re-assigned priority? If b is correct, then I/O has been blocked.arrow_forward
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