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Q1:Part 2 is a variant of the classic reader-writer problem. Part 1's specification does not require strict alternating of writers and readers. As a result, some updates of the writers may be missed by readers. And some contents may be read more than once. Part 2's setup, on the other hand, will result in strict alternating between writers and reader. In Part 2, we assume that we will have many writers, and one reader. The one reader reads from the shared string and prints the contents to the standard output. Several writers write to the same shared string. Only one writer can write to the string at any time. And once any writer writes, the reader should display it before other writers change the contents. In some sense, the reader is like a display server that displays the contents of the buffer.See Answer
Q2:English research about the differences between Android and iOS.See Answer
Q3:Problem 1.2 Answer the below survey questions about your experience and computer for this class. A. What kind of computer will you be using primarily for this class? (laptop, desktop, computer lab) B. What is the operating system on your computer? C. Will you be able to bring your laptop to class on Mondays/Wednesdays? D. Do you have experience using Excel? E. Do you have experience using Python? F. If so, briefly describe the scope of your experience with Python. G. Do you have experience using VBA? H. If so, briefly describe the scope of your experience with VBA.See Answer
Q4:Q2. Consider a logical address space of 256 pages with a 4-KB page size, mapped onto a physical memory of 64 frames. a) How many bits are required in the logical address? b) How many bits are required in the physical address?See Answer
Q5:Q3. Assume an operating system has a 21-bit virtual address and has only a 16-bit physical address. It also has a 2-KB page size. How many entries are there in each of the following? a) A conventional, single-level page table b) An inverted page table c) What is the maximum amount of physical memory?See Answer
Q6:  Does the multithreaded web server described in Section 4.1 exhibit task or data parallelism? Explain your answer. See Answer
Q7: What resources are used when a thread is created? How do they differ from those used when a process is created?See Answer
Q8: Explain the difference between fork() and pthread_create().  What happens if you fork a process with multiple threads? See Answer
Q9:What does pthread_join(pthread_t thread, void **value_ptr) do? What could happen in a multithreaded application if the main thread exits using exit(0) without running pthread_join for each thread, assuming the OS is Linux? See Answer
Q10:  Can a multithreaded solution using multiple user-level threads with one kernel thread achieve better performance on a multiprocessor system than on a single processor system? Explain. Assume this process is the only one running on the system.See Answer
Q11:  Describe how the factorial of 16 (16!) can be accomplished by using multithreading. See Answer
Q12:Consider the following code segment:     pid_t pid;     pid = fork();     if (pid == 0) { /* child process */         fork();         thread create( . . .);     }     fork();   a. How many unique processes are created? Explain.  b. How many unique threads are created? Explain. See Answer
Q13:The program shown in the figure below uses the Pthreads API. What would be the output from the program at LINE C and LINE P? See Answer
Q14:What's the difference between user space and kernel space? Where would a command line interface (shell) reside and why?See Answer
Q15: What system calls have to be executed by a command interpreter or shell in order to start a new process on a UNIX system?See Answer
Q16:1. Who was the innovator of the graphical user interface that inspired Steve Jobs and why couldn't they capitalize on that technology, like Apple and Microsoft did? 2. Who made a "100 billion dollar mistake" according to the documentary and why?See Answer
Q17:Given: 64 bit logical address Page size=4KB Page table entry size=4 byte Bonus #8 Find how many levels of hierarchical paging needed. Follow the same way as in the attached sample exercise.See Answer
Q18:Common problems and how to avoid them SSH not connnecting to blanca-may be one of these causes You are connected to UCC- Guest Wifi • Connect to UCCS-Wireless Wifi instead VPN enabled while in class • If you have your VPN enabled and you try to access Blanca on campus, you won't be able to access it, so disable your VPN Problems with quotation marks • You are entering a command that involves quotes but it does not work - Check that you have quotes at the start and end of the string grep "simple practice ^ missing Check that the quotes are the same type (single or double) grep "simple' practice ^ don't match Make sure you are not using curved quotes document. grep "simple" practice ^ Unix does not do curly quotes that you cut and pasted from a WordSee Answer
Q19:1. (100 points) Four processes P1, P2, P3 and P4 with related information are given in the following table: Burst Time (ms) Arrival Time (ms) Process P1 T P2 40 P3 20 P4 10 T is a positive integer (T>0). Please use a nonpreemptive shortest job first scheduling algorithm to make Gantt charts, and calculate different waiting times of three processes for different cases. Please write a professional perfect solution with sufficient details. 0 30 60 80See Answer
Q20:Prompt Complete a Site Survey: A site survey compares the three different operating systems that the company is planning to implement. To complete this task, use the Project One Site Survey Template linked in the Supporting Materials area. Specifically, you must address the following rubric criteria: Operating Systems: Acknowledge what OSes are already used in your site survey. The type of OS already used and how many employees are using it can influence your decision making. • Server: Determine whether the desktops are on a hardware or cloud-based server. o Although not required in this portion of the project, you may want to think about whether or not the server should be changed. This change could be recommended in your proposal./n• Standard Hardware for Operating System Types: Determine the minimum required hardware. This could include desktop and server. • Network Connection: Determine whether the network is wired or wireless. o You will want to think about whether or not the network connection should be changed. This change could be recommended in your proposal. Applications: Identify what software applications need to be supported by the OS. Your survey of what applications desktop users use most frequently will influence your decision making, as some applications are not supported by certain OSes.See Answer

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