Suppose two threads with a shared variable "x" execute the following instructions: shared int x; P1: _ x=0; x = x + 1; x = x + 1; x = x - 1; x = x - 1; _ if(x=1) cout << "Hi mom!" << endl; P2: - I x = 0; x = x + 1; x = x + 1; x = x - 1; x = x - 1; if (x=1) cout << "Hi mom!" << endl; Show this code can print "Hi mom!” by finding a sequence of instructions that can cause a race condition. Illustrate your sequence by numbering the instructions with the order in which they are executed.

Suppose two threads with a shared variable "x" execute the following instructions: shared int x; P1: _ x=0; x = x + 1; x = x + 1; x = x - 1; x = x - 1; _ if(x=1) cout << "Hi mom!" << endl; P2: - I x = 0; x = x + 1; x = x + 1; x = x - 1; x = x - 1; if (x=1) cout << "Hi mom!" << endl; Show this code can print "Hi mom!” by finding a sequence of instructions that can cause a race condition. Illustrate your sequence by numbering the instructions with the order in which they are executed.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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What is this code doing exactly? Please explain in detail so I can better understand the process. Thank you #include <pthread.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #define MAX 100 static void * threadFunc (void *arg) { char *str = (char *) arg; int count = 0; printf("\nThread: threadFunc started \n"); while(1) { sleep(1); printf("\n threadFunc: executing loop \n"); } sleep(5); printf("\nThread: threadFunc exiting \n"); } int main(int argc, char *argv[]) // init thread or main thread { pthread_t t1_id; void *res; int s; int count; s = pthread_create(&t1_id, NULL, threadFunc, NULL); if ( s != 0 ) //if creating the new thread is successful, then s will be zero. { perror("Thread create error"); } for (count = 0; count < 10; count++) { sleep(2); printf("\n main thread: count value = (%d) \n", count); } pthread_cancel(t1_id); printf("main thread: exiting now \n "); pthread_exit(NULL);…
Please DO NOT respond to this question by copy/pasting the code provided elsewhere on the site, none of those work. Thanks. Virtual Memory Lab This lab project addresses the implementation of page-replacement algorithms in a demand-paging system. Each process in a demand-paging system has a page table that contains a list of entries. For each logical page of the process, there is an entry in the table that indicates if the page is in memory. If the page is in memory, the memory frame number that page is resident in is indicated. Also, for each page, the time at which the page has arrived in memory, the time at which it has been last referenced, and the number of times the page has been referenced since the page arrived in memory are maintained. The page table data structure is a simple array of page-table entries (PTEs). Each PTE contains five fields as defined below: struct PTE { int is_valid; int frame_number; int arrival_timestamp; int…
Hello Can you please help me with this code because I am struggling how do to this, can you please help me this code has to be in C. Write a multithreaded program that calculates various statistical values for a list of numbers. This program will be passed a series of numbers on the command line and will then create three separate worker threads. One thread will determine the average of the numbers, the second will determine the maximum value, and the third will determine the minimum value. For example, suppose your program is passed the integers 90 81 78 95 79 72 85 The program will report The average value is 82 The minimum value is 72 The maximum value is 95 The variables representing the average, minimum, and maximum values will be stored globally. The worker threads will set these values, and the parent thread will output the values once the workers have exited. (We could obviously expand this program by creating additional threads that determine other statistical values, such as…
You'll write a C++ program to demonstrate thread synchronization. Your main function should first create an empty file called *sync.txt*. Then it will create two separate threads: *Thread-A* and *Thread-B*. Both threads will open *sync.txt* and write to it simultaneously. *Thread-A* will write the numbers 0 through 9, a total of fifty-thousand times in nested `for` loops, then exit. In other words, print the numbers 0 through 9 over and over again, with each run on a separate line, for 50,000 lines. Here's an example of one such line: ```text 0 1 2 3 4 5 6 7 8 9 ``` Somewhat similarly, *Thread-B* will write the letters A through Z fifty-thousand times in nested `for` loops, then exit. In other words, print the letters A through Z over and over again, with each run on a separate line, for 50,000 lines. Here's an example of one such line: ```text A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ``` Do not write each line as one long string. You must write each character to the…
I am having error E0020 and E0140 in C++. How can I fix it? /*Christopher JimenezCIS247CATM application24 November */ // bring in our libraries //Step #1#include <iostream>#include <conio.h>#include <string>#include <fstream> // read/write to files#include <ctime> // time(0)#include <iomanip> //setprecision()using namespace std; // prototypesvoid deposit(double* ptrBalance);void withdrawal(double* ptrBalance, float dailyLimit); // overloaded method - this version does not take withdrawal amountvoid withdrawal(double* ptrBalance, float dailyLimit, float amount); //overloaded method that takes withdrawal amount ///Entry point to the applicationint main(){ // create constant values -- cannot be changedconst int EXIT_VALUE = 5;const float DAILY_LIMIT = 400.0F;const string FILENAME = "Account.txt"; //create balance variabledouble balance = 0.0; // look for the starting balance; otherwise generate a ramdom starting balanceifstream iFile(FILENAME.c_str());…
Can you please help me with this code because I am struggling on how to do this, This has to be in C code. question that I need help with: Write a multithreaded program that calculates various statistical values for a list of numbers. This program will be passed a series of numbers on the command line and will then create three separate worker threads. One thread will determine the average of the numbers, the second will determine the maximum value, and the third will determine the minimum value. For example, suppose your program is passed the integers 90 81 78 95 79 72 85 The program will report The average value is 82 The minimum value is 72 The maximum value is 95 The variables representing the average, minimum, and maximum values will be stored globally. The worker threads will set these values, and the parent thread will output the values once the workers have exited. (We could obviously expand this program by creating additional threads that determine other statistical values,…
Command line arguments are passed to int main(int argc, char** argv) as arguments argc and argv. You should assume that argc is at ebp+8 and argv is at ebp+12. 00000000 <what>: 0: push %ebp 1: mov %esp,%ebp 3: sub $0x10,%esp 6: mov 0x8(%ebp),%eax 9: add $0x4,%eax c: mov %eax,-0x4(%ebp) f: mov 0x8(%ebp),%eax 12: imul 0xc(%ebp),%eax 16: mov %eax,-0x8(%ebp) 19: mov 0x8(%ebp),%eax 1c: sub 0xc(%ebp),%eax 1f: mov %eax,-0xc(%ebp) 22: mov -0x4(%ebp),%edx 25: mov -0x8(%ebp),%eax 28: add %eax,%edx 2a: mov -0xc(%ebp),%eax 2d: add %edx,%eax 2f: leave 30: ret00000031 <main>: 31: lea 0x4(%esp),%ecx 35: and $0xfffffff0,%esp 38: pushl -0x4(%ecx) 3b: push %ebp 3c: mov %esp,%ebp 3e: push %ebx 3f: push %ecx 40: sub $0x10,%esp 43: mov %ecx,%ebx 45: mov 0x4(%ebx),%eax 48: add $0x4,%eax 4b: mov (%eax),%eax 4d: sub…
#include <iostream>#include <pthread.h>#include <stdlib.h> #define TOTAL_THREADS 4 int count;pthread_mutex_t the_mutex; // phread mutex variable - initialize here if using the initializer macro void* myFunction(void* arg){int actual_arg = *((int*) arg);for(unsigned int i = 0; i < 10; ++i) {// TODO:// Use a Pthread mutex to control// access to the critical region. // Beginning of the critical regioncount++;std::cout << "Thread #" << actual_arg << " count = " << count << std::endl; // End of the critical region// TODO:// Relinquish access to the Pthread mutex// since critical region is complete. // Random wait - This code is just to ensure that the threads// show data sharing problemsint max = rand() % 100000;for (int x = 0; x < max; x++);// End of random wait code}pthread_exit(NULL);} int main(){int rc[TOTAL_THREADS];pthread_t ids[TOTAL_THREADS];int args[TOTAL_THREADS];// TODO: Initialize the pthread mutex here if using the…
3. I/O Management: Disk Arm Scheduling & RAIDa. It is known that a disk drive has 256 cylinders, with cylinder numbers starting from 0 and ending at 255. The position of the needle on the disk drive currently stops at 128. It is also known that the needle always “goes to the cylinder with the smaller number first”. The order of the positions visited sequentially is: 254, 64, 32, 100, 50, 70. From the 3 choices of algorithms below, which one is the best algorithm? Make each image and determine the seektime.i. SCANii. C-SCANiii. FIFO
Task 3: Summary We would like to be able to generate a summary for each logfile to give us a rough idea of its contents. Instructions Create a file called Summary.java. As with Task 1, open the file for reading in a try-catch block. Read through the entire file, counting how many of each message/event type occurs. Print out a summary with the count of each event/message type. As a sanity check: the total number of message/event type counts should equal 1000. Hint: a useful method could be String.split. Sample Input/Output Example 1: Summary -------------------- Notifications: 322 Warnings: 326 Errors: 352 Cannot find logfile! Exiting...
Extra Credit (Optional) https://leam.zybooks.com/zybook/UCMERCEDCSE019FariasSummer loci My library> CSE 019: Introduction to Computing home > 2.9: Math module n @ W S Check CHALLENGE ACTIVITY 478822 3415480.qx3zqy7 Jump to level 1 2.9.2: Math functions. 6 Your code goes here 7 # Next 3 Write the code that computes: z = |x+y| Note: Use dot notation to access an object in the math module. Ex: The constant pi is accessed via math.pi. 1 import math 2 3 x = float(input())] 4 y float(input()) 8 print (f'(z:.2f}') # This will output only 2 decimal places. 9 E D IDI $ 4 Q Search R F % LO Section 29 CSE 019 Introduct X 2023/chapter/2/section/9 5 Ombuds UC Merced|(209) 228-4410 T ◄O G 6 no U & 80 Y 7 EzyBooks catalog H 18 4+ 2 N 19 144 8 00 J ( - Help/FAQ DELEANOR LASHUNI HASTI 9 A 18 M Amazon ► 11 K Feedback? O M-D E- ENG P A 1
In C++, not C please! Assume that your computer has 4 CPUs. Write a multithreaded program that runs 4 different threads concurrently. The entire process will add the first 1,000,000 numbers (from 1 to 1,000,000) to a shared variable sum. You need to use a pthread_mutex_t to provide mutual exclusion so that the final result of sum is 500,000,500,000 Note: you can download and modify the file summation_thread_shared_sum.cpp. This file does not use a mutex lock, so the result is incorrect. You must add a mutex lock correctly in the file so that the program generates the right outcome.