Midterm 2 Solutions Essay - 1910 Words

CSCI 4061: Introduction to Operating Systems Fall 2008 Mid-Term Exam II Sample Solution NAME: STUDENT ID: General Instructions: †¢ Write your name and student ID clearly above. †¢ You have 1 hour and 15 minutes to write the exam. No extra time will be given. †¢ There are 4 questions in the exam, all with subparts. The questions combine for a maximum of 100 points. †¢ You must write your answers clearly in the space provided for each question. You might use the backside of each page, as well as any additional sheets as required. If you are using additional space, you must clearly label the question no. that you are answering. Any loose sheets must have your name and student ID written clearly. †¢ The exam is open book/open notes, however,†¦show more content†¦The threads run concurrently, and their order of execution or the interleaving of their instructions is non-deterministic. For each of the following, show how you will modify the code for thread i using semaphores to achieve the desired execution behavior. Note: For each semaphore that you use, show where you will add its wait and/or signal operations, and also specify its initial value. Also Note: You can use pseudocode instead of POSIX/C syntax for your solution. (a) (6 pts) Have each thread execute its code (both foo and bar) in a mutually exclusive manner. The order in which the threads execute does not matter. Ans: This is a classical critical section problem, and we basically need a mutex lock here. Recall that a semaphore with initial value of 1 can be used identically to a mutex lock (since it allows only 1 thread to be in the critical section at a time). So the solution is as follows. Declare a global semaphore: semaphore sem=1; Code for thread i: wait(sem); foo(i); bar(i); signal(sem); (b) (12 pts) Have each thread execute foo in a mutually exclusive manner, but allow upto 5 of them to execute bar concurrently. The order in which the threads execute does not matter. Ans: Here, executing foo is again a classical critical section problem, that can be solved similar to p art (a). However, executing bar allows multiple threads to be in the critical section, and this can be achieved by initializing the semaphoreShow MoreRelatedFin 534 Midterm Exam Part 1 and Part 2 Solution711 Words   |  3 PagesFIN 534 Midterm Exam Part 1 and Part 2 Solution Purchase here https://sellfy.com/p/cZb2/ Product Description FIN 534 Midterm Exam Part 1 and Part 2 Solution FIN 534 Midterm Exam Part 1 and Part 2 Solution FIN 534 Midterm Exam Part 1 and Part 2 Solution FIN 534 Midterm Exam Part 1 and Part 2 Solution FIN 534 Midterm Exam Part 1 and Part 2 Solution FIN 534 Midterm Exam Part 1 and Part 2 Solution FIN 534 Midterm Exam Part 1 and Part 2 Solution Purchase here https://sellfy.com/p/cZb2/ Read MorePlagiarism And Academic Dishonesty Prevention Over Detection And Punishment1614 Words   |  7 Pagesdesigned to target plagiarism/academic dishonesty prevention over detection and punishment. Answering the questions in the problem set would ensure the following things: 1. 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Succubus Blues CHAPTER 7 Free Essays

I turned and saw Roman sitting over in a corner of the small lobby. He looked striking in a deep green turtleneck, his dark hair brushed away from his face. He smiled at me when I caught his eye, and I walked over to sit near him. We will write a custom essay sample on Succubus Blues CHAPTER 7 or any similar topic only for you Order Now â€Å"Jesus, you really are a stalker.† â€Å"Well, well. Aren’t you presumptuous. I only came for my coat.† â€Å"Ah.† I blushed, feeling foolish. â€Å"How long have you been waiting?† â€Å"Not too long. I actually tried the bookstore first, thinking that might be a little less stalker- ish.† â€Å"It’s my day off.† I looked down at the riotously colored blossoms in my arms. â€Å"Thanks for the flowers. You didn’t need to bring them to get your coat back.† Roman shrugged, those blue-green eyes wreaking havoc with me. â€Å"True, but I figured they might induce you to go out for a drink tonight.† So he did have another motive. â€Å"Not this again – â€Å" â€Å"Hey, if you’d wanted to avoid ‘this,’ you shouldn’t have lured me in last night. Now it’s too late. You might as well avoid the long, drawn-out pain and get it over with quickly. Sort of like taking off a Band-Aid. Or cutting off a limb.† â€Å"Wow. Who says there’s no romance left in the world?† In spite of my sarcasm, I found Roman’s easy repartee a refreshing change from the halting atmosphere with Seth. â€Å"So, what? Does that mean you finally concede, general? Truly, you’ve fought a worthy battle in eluding me thus far.† â€Å"I don’t know. You showed up at my home. I apparently didn’t do that much eluding.† When he only waited expectantly, my smile faded. I sighed, studying him and trying to figure out his motivations. â€Å"Roman, you seem like a nice guy and everything – â€Å" He groaned. â€Å"No. Don’t start that with me. It’s never a good sign when a woman says ‘you’re a nice guy’ It means she’s getting ready to let you down easy.† I shook my head. â€Å"I’m just not interested in getting serious with anyone right now, that’s all.† â€Å"Whoa, ‘get serious’? Slow down there, sister. I’m not asking you to marry me or anything. I just want to go out with you sometime, maybe catch a movie, have dinner and drinks, that’s it. Kiss at the end of the night if I’m lucky. Hell, if that still freaks you out, we’ll just shake hands.† I leaned my head back against the wall, and we stayed like that a moment, each of us sizing up the other. I knew it was perfectly possible for men and women to go out on dates without automatic sex, but my dates generally didn’t work that way. My instincts drove me to seek sex out, and looking at him, I realized that urge might be strong independent of any sort of succubus need to feed. I liked the way he looked, the way he dressed, and the way he smelled. I especially liked his goofy attempt at courtship. Unfortunately, I couldn’t turn off the destructive succubus absorption, even if I wanted to. It would happen of its own volition, probably strongly with him. Even the kiss he joked about would still steal some of his life away. â€Å"I don’t know anything about you,† I said finally, realizing I’d been quiet too long. He smiled lazily. â€Å"What do you want to know?† â€Å"Well†¦ I don’t know. What do you like to do? Do you even have a job? You must have lax hours to be able to hang around me all the time.† â€Å"All the time, huh? You’re being presumptuous again, but yes, I do work. I teach a couple of community college linguistics classes. Short of when I’m there, I get to make my own hours with grading and stuff.† â€Å"Okay. What’s your last name?† â€Å"Smith.† â€Å"No way.† â€Å"Way.† â€Å"That hardly goes with Duke Roman.† I tried to think of another appropriate screening item. â€Å"How long have you lived in Seattle?† â€Å"A few years.† â€Å"Hobbies?† â€Å"I’ve got some.† He paused and cocked his head toward me when no more questions came. â€Å"Anything else you want to know? Should I dig out my college transcripts perhaps? A full curriculum vitae and background check?† I waved a hand of dismissal. â€Å"I have no use for inconsequential information like that. I only need to know the really important stuff.† â€Å"Like?† â€Å"Like†¦ what’s your favorite song?† The question obviously caught him by surprise, but he recovered immediately, just as he had last night. I loved that. â€Å"The last half of the Beatles’ Abbey Road.’ â€Å"The last half of Abbey Road?† â€Å"Yeah, there are a bunch of songs, but they sort of blend into one song – â€Å" I cut him off with a quick gesture. â€Å"Yeah, yeah, I know the album.† â€Å"So?† â€Å"So, that’s a pretty good answer.† I tugged at my ponytail, wondering how best to navigate this. He nearly had me. â€Å"I – no. I’m sorry. I can’t. It’s just too complicated. Even the one date. It’ll turn into a second date, then another, then – â€Å" â€Å"You really do jump ahead. What if I gave the super-secret Boy Scout promise to never bother you again after one date?† â€Å"You’d agree to that?† I asked skeptically. â€Å"Sure, if that’s what you want. But I don’t think you will once you’ve spent an evening with me.† A suggestive tone in his voice did something to my stomach I hadn’t felt in a very long time. Before I could fully process this, my cell phone rang. â€Å"Sorry,† I apologized, digging it out of my purse. Glancing at the Caller ID display, I recognized Cody’s number. â€Å"Yeah?† â€Å"Hey, Georgina. Something weird happened tonight†¦Ã¢â‚¬  Lord. That could mean anything from another death to Peter shaving his head. â€Å"Hang on a second.† I stood up and looked at Roman, juggling the vase of flowers as I did. He rose with me, looking concerned. â€Å"Is everything okay?† â€Å"Yeah, I mean, no. I mean, I don’t know. Look Roman, I need to go upstairs and take this call. I appreciate the flowers, but I just can’t get involved right now. I’m sorry. It’s not you, it’s me. Honestly.† He took a few steps toward me as I started to walk away. â€Å"Wait.† He dug in his pockets, pulled out a pen and piece of paper. Hastily he scrawled something and handed it to me. I looked down and saw a phone number. â€Å"For when you change your mind.† â€Å"I won’t.† He simply smiled, inclined his head slightly, and left the lobby. I watched him only a moment before heading upstairs, anxious to hear Cody’s news. Once inside, I set the flowers on my counter and put the phone back to my ear. â€Å"Still there?† â€Å"Yeah. Who’s Roman and why’d you use the old ‘it’s not you, it’s me’ line on him?† â€Å"Never mind. What’s going on? Is someone else dead?† â€Å"No†¦ no. It’s just, something happened, and Peter doesn’t think it’s a big deal. Hugh said you thought there might be more going on than we think.† â€Å"Tell me what happened.† â€Å"I think we were followed last night.† Cody related how, not long after leaving my place, he’d kept hearing footsteps following him and Peter on the street. Whenever he’d turned around, no one was there. Peter had written the matter off, as they had sensed no other being present. â€Å"Maybe you don’t know what a vampire hunter feels like.† â€Å"I’d still have felt something. And Peter certainly would have. Maybe he’s right, and I was imagining things. Or maybe it was just a regular mortal, wanting to mug us or something.† I doubted that. We couldn’t sense mortals the same way we could sense immortals, but one would be hard-pressed to sneak up on a vampire. â€Å"Thanks for telling me. You did the right thing.† â€Å"What should I do now?† A strange, anxious feeling played through me as I thought about some freak stalking Peter and Cody. Dysfunctional they might have been, but I loved them. They were the closest I had to family anymore. I couldn’t let anything happen to them. â€Å"What Jerome said. Be careful. Stay with others. Let me know immediately if anything happens.† â€Å"What about you?† I thought of Erik. â€Å"I’m going to clear things up, once and for all.† How to cite Succubus Blues CHAPTER 7, Essay examples

Disappearing Languages free essay sample

Many languages are disappearing every year. Is this is a bad thing or could have fewer languages help bring people together. Globalization and liberalizing made the world to shrink Into the size of a village. Unfortunately, this means that smaller languages are In danger of extinction. Some people fear the loss of cultural Identity, while others believe that the world with less language Is better. In a 4-paragraph essay, explain why you feel that we should or should not preserve local languages. Order, unity, and continuity are human inventions, just as truly as catalogues and encyclopedias. Bertrand Russell. Fewer languages provide more people the chance to speak with one another. Even though some people have the fear that they would lose their cultural identity, I disagree. I believe that fewer languages in the world would be better by providing the unity and friendship of many countries. There is plenty to be gained from having fewer languages. We will write a custom essay sample on Disappearing Languages or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page By having the same language, people can offer and sense, unity, equality, and also encourage financial expansion. This could decrease the problem of confusion and misinterpretations, all while providing rapid travel between nations, and enhancing commerce.Through countries having the same language, this can reduce downgrading In the standards of life. Isosceles who do not speak a major world language may fall behind In science, technology, and economics. Another point In having less language would be communal thoughts. Universal collaboration would happen instantaneously, rather than taking an inordinate length of time to come together. Although some people are afraid of the loss of culture and identity, it appears that, good ideas can survive for centuries. Today, we are not speaking Latin but, the values of their philosophers are remained with us each day.Even the languages, like Greek, that are spoken today still retain the philosophies and are improved upon. Overall, fewer languages prove to be more of a benefit than a hindrance. People can unite and come together more often with less languages. Fewer barriers are set In place with fewer languages. Technology, standards of life, and more can all be Increased by the decrease In languages. Unity Is key to shrinking the world, while Increasing consciousness of the world as a whole. So by lessening the amount of languages, is the best way to obtain unity.