Problem 1. This problem is about the semantics and use of semaphores, as described in your textbook. Read the manual page for the POSIX semaphore operations sem_init(), sem_wait(), and sem_post (). a. What should the second argument to sem_init() be if the thread is to be used to synchronize threads in the same process (as opposed to different processes)? b. The library function sem_getvalue() is supposed to return the value of the semaphore vari- able. Explain why this is not a very useful call. (Hint: see the man page.) c. Consider the seconde readers-writers problem, in which writers are prioritized over readers. Suppose there are m > 1 writers and, say, n > 0 readers. Describe a scenario where a reader experiences starvation, and the shared data is never read. Be precise!

Problem 1. This problem is about the semantics and use of semaphores, as described in your textbook. Read the manual page for the POSIX semaphore operations sem_init(), sem_wait(), and sem_post (). a. What should the second argument to sem_init() be if the thread is to be used to synchronize threads in the same process (as opposed to different processes)? b. The library function sem_getvalue() is supposed to return the value of the semaphore vari- able. Explain why this is not a very useful call. (Hint: see the man page.) c. Consider the seconde readers-writers problem, in which writers are prioritized over readers. Suppose there are m > 1 writers and, say, n > 0 readers. Describe a scenario where a reader experiences starvation, and the shared data is never read. Be precise!

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter11: Operating Systems

Section: Chapter Questions

Problem 14VE

See similar textbooks

Similar questions

Complete the following code. The goal is to implement the producer-consumer problem. You are expected to extend the provided C code to synchronize the thread operations consumer() and producer() such that an underflow and overflow of the queue is prevented. You are not allowed to change the code for implementing the queue operations, that is the code between lines 25 and 126 as shown in the screenshot. You must complete the missing parts as shown in the screenshot as well as complete the missing codes of producer and consumer. #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <time.h> #include <pthread.h> #include <semaphore.h> #include <errno.h> #include <fcntl.h> #define MAX_LENGTH_CAP 100 #define INIT -127 #define UNDERFLOW (0x80 + 0x02) #define OVERFLOW 0x80 + 0x01 #define BADPTR (0x80 + 0x03) #define CONSUMER_TERMINATION_PROBABILITY 40 #define PRODUCER_TERMINATION_PROBABILITY 30 // ============= LOCKED…
Write a MultiThreaded ServerSocket Program in C# that can handle multiple clients at the same time. a C# Server Socket use TcpListener Class and listen to PORT 9393. When the C# Server Socket gets a request from Client side, the Server passes the instance of the client request to a separate class handleClient. For each Client request, there is a new thread instant is created in C# Server for separate communication with Client.
Implement the producer consumer problem (also known as bounded buffer problem) in java. create two threads i.e. the producer thread and the consumer thread. Create a shared buffer object using a LinkedList or Queue. The producer adds data to the buffer and the consumer removes data from the buffer. The producer cannot add data if the buffer is full and the consumer cannot remove data from the buffer if it is empty. Make sure there are no race conditions and deadlocks.
Implement a class that checks whether a given number is a prime numberor not using both the Thread class and Runnable interface.
I'm trying to construct 2 methods to sort an array One method will sort an array in ascending order the other method will sort the array in the sending order. To try to implement concurrency of threading. Writen in java.
Could you assist me with this code? I'm struggling to comprehend how to implement it. The code should be written in C and must involve a 5 x 5 matrix. I have the provide the question and my code. You need to use the pthread for matrix multiplication. Each threadfrom the threadpool should be responsible for computing only a partof the multiplication (partial product as shown in the above picture –all Ti(S) are called a partical product). Your main thread should splitthe matrices accordingly and create the partial data arrays that areneeded to compute each Ti. You must create a unique task with thedata and submit it to the job queue. You can compute the partialproducts concurrently as long as you have threads available in thethreadpool. You have to remove the task the from queue and submitto a thread in the threadpool. You should define the number ofthreads to be 5 and keep it dynamic so that we can test the samecode with a higher or lower number of threads as needed. When allthe partial…
Consider the linked list in the image. A node in the linked list is defined as follows: node begin data: element of any datatype link: pointer to node end f is a pointer to the first node in the linked list If q is a pointer then, q.link contains q's link q.data contains q's data Find the output of the print instruction based on the following operations: p=f.link.link p.link.link=p print (f.link.link.link.link.link.link.data) The instructions are not dependent on any programming language. Write your answer in the box given below. Use the same case for the characters as given in the question. Do not insert any spaces in the answer.
To solve the problem of mismatch between the speeds of computer and printer, we usually use a buffer. Computer writes data to the buffer, and then printers get data from buffer. Which data structure could be used to implement the buffer? (A) Stack (B) Queue
Explain why synchronization is necessary in the following situation:You have modeled a bank as an array of BankAccountobjects. Each BankAccount object has an associated thread, which transfers money from this bank account to another, randomly selected bank account in the same bank. The amount to transfer is the same for all transactions. The threads work in parallel.
An alternative to implementing Java's Runnable interface is to extend SyntheticComponent Thread Object Heuristic
In a programming language (Pascal), the declaration of a node in a singly linked list is shown in Figure P6.7(a). The list referred to for the problem is shown in Figure P6.7(b). Given P to be a pointer to a node, the instructions DATA(P) and LINK(P) referring to the DATA and LINK fields, respectively, of node P are equivalently represented by P↑. DATA and P↑. LINK in the programming language. What do the following commands do to the logical representation of the list T? i) ii) TYPE POINTER=NODE; NODE RECORD DATA: integer; LINK: POINTER END; VAR P, Q R: T POINTER (a) Declaration of a node in a singly linked list T 31 TE 57 12 (b) A singly linked list T iii) R₁.LINK: = Q iv) R₁.DATA: = P₁.DATA: Q₁.DATA + R₁.DATA Q: = P |R Figure P6.7. (a and b) Declaration of a node in a programming language and the logical representation of a singly linked list T Q.LINK.DATA + 10 91 Linked Lists 189
Write a code for a simple text editor. Use fully connected linked list, with four pointers next,prev,up and down. Note: Use linkedlist Data structure for code and use C++ language and also file handling. Please complete the requirements.