Semaphores: Select all of the following statements that are true. The operations P (Test) and V (Signal) can be interrupted. The operations P (Test) and V (Signal) run in the operating system's user mode. The values of binary semaphores are restricted to 0 and 1. Counting semaphores are used to manage limited resources and the corresponding access to them. Semaphores can be used to synchronize certain operations between processes. When accessing the list of a semaphore, the FIFO principle should be preferred to the LIFO principle.
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- Mutual Exclusion: Select all of the following statements that are true. The Peterson Algorithm does not rely on the mechanism of busy waiting. The Peterson Algorithm is a purely software-based solution to the mutual exclusion problem. The only way to guarantee the atomicity of operations is to disable interrupts. Mutex Locks are an API offered by operating systems to protect critical sections. In order to enter a critical section protected by Mutex Locks, the release() operation must be executed first. The test_and_set instruction is atomic.Java Language Create Clock class and demonstrate the features of the class with the driver program. upload a single file that contains the source code with documentation for both the clock class and the driver and execution of the program. The rule for execution is that you execute enough times with sufficient data that every line in the program is executed).Arithmetic Exception Arman has a shop where he provides stuff on rent. The whole payment system is computerised. A customer has to enter the item name, item type, cost, and the number of days they have taken the item for rent. The system then tells them the cost per day. But there is a problem with the machine that if the number of days entered is not an integer value then the system would crash. To handle this, Arman decided to upgrade the software and use exception handling in case the customer entered any invalid input it should display " Number of days x is invalid".Write a C++ program to find the item cost per day with the cost for n days given. The arithmetic exception has to be thrown if the n is less than or equal to zero.Strictly adhere to the Object-Oriented specifications given in the problem statement. All class names, member variable names, and function names should be the same as specified in the problem statement.The class Item has the following private data members.…
- The linker mean: A program that combines the object program with the programs from libraries A program that loads an executable program into main memory. A program that translates instructions written in a high-level language into the equivalent machine language. The machine language version of the high-level language program. A program that translates a program written in assembly language into an equivalent program in machine language.Problem: UMLThis exercise is for a simplified supermarket cash register system. The normal procedure for using the cash register is as follows:• A customer arrives at the checkout with items to pay.• The cashier records the identification number of each item, as well as the quantity if it is greater than one.• The checkout displays the price of each item and its description.• When all purchases are recorded, the cashier signals the end of the sale.• The cash register displays the total purchases.• The customer chooses his method of payment:✓ cash: the cashier collects the money received; the cashier indicates the currency to be returned to the customer;✓ check: the cashier checks the creditworthiness of the customer by transmitting a request to an authorization center via the cashier;✓ credit card: a bank terminal is part of the cash register. It transmits an authorization request to an authorization center according to the type of card.• The cash register registers the sale and prints…Problem: UMLThis exercise is for a simplified supermarket cash register system. The normal procedure for using the cash register is as follows:• A customer arrives at the checkout with items to pay.• The cashier records the identification number of each item, as well as the quantity if it is greater than one.• The checkout displays the price of each item and its description.• When all purchases are recorded, the cashier signals the end of the sale.• The cash register displays the total purchases.• The customer chooses his method of payment:✓ cash: the cashier collects the money received; the cashier indicates the currency to be returned to the customer;✓ check: the cashier checks the creditworthiness of the customer by transmitting a request to an authorization center via the cashier;✓ credit card: a bank terminal is part of the cash register. It transmits an authorization request to an authorization center according to the type of card.• The cash register registers the sale and prints…
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- DEADLOCK MANAGEMENT TECHNIQUE Write a program to simulate the Banker’s algorithm for the purpose of deadlock avoidance. Your program receives as input the number of processes in the systems and how many devices each job requires to complete execution. Your program shows how devices are allocated to each process as it executes and if the system is currently in a safe or unsafe state. USE JAVAA travel authorisation form is used in most companies to approve travel expenses for employees. Typically, an employee fills out a blank form and sends it to his or her manager for a signature. If the amount is (< R500), then the manager signs the form and routes it to accounts payable to be input into the accounting system. The system generates a check that is sent to the employee for the right amount, and after the check is cashed, the form is filed away with the cancelled check. If the check is not cashed within 90 days, the travel form expires. When the amount of the travel voucher is (> R500), then the manager signs the form and sends it to the chief financial officer, along with a paragraph explaining the purpose of the travel; the chief financial officer signs the form and passes it along to accounts payable. Of course, both the manager and the chief financial officer can reject the travel authorization form if they do not feel that the expenses are reasonable. In this…Using the techniques presented during this semester create a complete C++ program to emulate anEncryption/Decryption Machine. The machine will be capable of the following: Encrypt a string entered by the user Choose between two different encryption methods Decrypt a string entered by the user Choose between two different decryptions methods Decrypt without knowing the encryption method (provide all possible outputs)The interface must be professional and fully intuitive to the userThe program will be menu driven.The program will use a class to define and implement each of the methods as member functions and willstore the original string and the encrypted/decrypted strings as data members.In addition to using a class you must also use all the major structures we used this semester including:Selection statements (if, if-else, switch) the appropriate one(s) of courseLoops (while, for, do-while) the appropriate one(s) of courseStandard Libraries (don’t recreate the…