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  • Q1: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
  • Q2: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
  • Q3:Multiple Choice questions: 10)   _____ is not considered a challenge when designing applications for multicore systems.     A)  Deciding which activities can be run in parallel     B)  Ensuring there is a sufficient number of cores     C)  Determining if data can be separated so that it is accessed on separate cores     D)  Identifying data dependencies between tasks.   11) ____ is a thread library for Solaris that maps many user-level threads to one kernel thread.     A)  Pthreads     B)  Green threads     C)  Sthreads     D)  Java threads   12) Which of the following is a function that can be provided by Pthreads API for constructing a multithreaded program?     A) pthread_attr_init     B) pthread_create     C) pthread_join     D) all of the above   14) Which of the following options exist to deliver signals in multithreaded program?     A) deliver the signal to the thread to which the signal applies     B) deliver the signal to every thread in the process     C) deliver the signal to certain threads in the process     D) assign a specific thread to receive all signals for the process     E) all of the above   15)  In multithreaded programs, the kernel informs an application about certain events using a procedure known as a(n) ____.     A)  signal     B)  upcall     C)  event handler     D)  pool See Answer
  • Q4:  Does the multithreaded web server described in Section 4.1 exhibit task or data parallelism? Explain your answer. See Answer
  • Q5:The next paper is an old but important publication in the history of operating systems. The paper is A. Bensoussan and R. Daley, "The Multics Virtual Memory: Concepts and Design", Proceedings of the Symposium on Operating Systems Principles, 1969." As usual, I would like a summary, followed by a separate section containing your reaction. As I continue to read your submissions, in many cases the summaries are better than the reaction sections, in the sense that they were given more attention, or they are so commingled that I can't tell the summary and reaction apart. Please physically separate the two sections (using 'Summary' and 'Reaction' headings would be a good way to do that) and give some serious, critical thought to what you have read.See Answer

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