ZuoTi.Pro
Question

I want to create a program that first calculate the summation from 1 to R. This code will computes the summation from 1...

I want to create a program that first calculate the summation from 1 to R.
This code will computes the summation from 1 to R with single thread.

#include <pthread.h>
#include <unistd.h>

#include <stdlib.h>
#include <assert.h>
#include <stdio.h>

#define NuMBer_THREADS 2
#define R 1e4


long long sum = 0;
// matrix multiplication is  c = a * b;

void calculatesum()
{
int i=1;
for(i=1;i<=N;i++)
{
sum+=i;
asleep(100);
}
}


// Thread function
// Each thread calculates the summation over (R / NuMBer_THREADS) numbers
// For example, if R = 10 and NuMBer_THREADS = 2
// then thread 0 calculates the sum of [1 2 3 4 5]
// and thread 1 calculates the sum of [6 7 8 9 10]

void* Thread_function(void* argument) {
// * Implement this function *

  
return NULL;
}

// Creates threads
void calculatesum_MultiThread()
{
// *Implement this function *


}

engineering   Computer-Science   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

Code -

# include <stdio.h>
# include <pthread.h>
//method declare
void * thread_sum(void *);
//global variable
int TotalSum=0;

pthread_mutex_t mVar=PTHREAD_MUTEX_INITIALIZER;

main()
{
//variable declare
int iNumber,iCount;
// single thread.
pthread_t tid;
//ask user upto which number he want sum
printf("Enter Number Up to Which You want to Sum :");
scanf("%d",&iNumber);
//thread create
pthread_create(&tid,NULL,thread_sum,(void *)&iNumber);
for(iCount=1;iCount<=iNumber;iCount=iCount+2)
{
pthread_mutex_lock(&mVar);
TotalSum=TotalSum + iCount;
pthread_mutex_unlock(&mVar);
}
  
pthread_join(tid,NULL);
  
printf("Final Sum is : %d \n",TotalSum);
// return 0;
}

void *thread_sum(void *no)
{
int *iNumber,iCount;
iNumber=(int*)no;
  
for(iCount=2;iCount<=*iNumber;iCount=iCount+2)
{
pthread_mutex_lock(&mVar);
TotalSum=TotalSum + iCount;
pthread_mutex_unlock(&mVar);
}
pthread_exit(NULL);
}

Screenshots -

© I Want To Create A Program That + Online C Compiler-online editor × + a https://www.onlinegdb.com/online ccompiler ll as SG

0 0
Add a comment
Know the answer?
Add Answer to:
I want to create a program that first calculate the summation from 1 to R. This code will computes the summation from 1...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • so in this code, it computes the sum 1+2+....+n but i want it to compute 2*(1+2+....+n)...

    so in this code, it computes the sum 1+2+....+n but i want it to compute 2*(1+2+....+n) using semaphores implement solution to the critical section problem #include #include int sum; /* this data is shared by the thread(s) */ void *runner(void *param); /* threads call this function */ int main(int argc, char *argv[]) { pthread_t tid; /* the thread identifier */ pthread_attr_t attr; /* set of thread attributes */ if (argc != 2) { fprintf(stderr,"usage: a.out \n"); return -1; } if...

  • //In this assignment, we use multiple threads to calculate the sum // 1*1 + 2*2 +...

    //In this assignment, we use multiple threads to calculate the sum // 1*1 + 2*2 + 3*3 + 4*4 + ... + n*n // Note we should know from CSE2500 that this sum is // n*(n+1)*(2*n+1)/6 // We a n value, we will create 2*n threads to do the calculation so that // we can have a race condition. // Before you change the code, read the code and run the code and see what // happens. Do we already...

  • //In this assignment, we use multiple threads to calculate the frequencies of the first digits //of...

    //In this assignment, we use multiple threads to calculate the frequencies of the first digits //of the numbers in an array of long integers #include <pthread.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <assert.h> //#define NUM_THREADS 2 #define DIGITS 10 #define MAX 100000000 unsigned long a[MAX]; struct thread_data { int thread_num; int i, j;                           //the staring and ending index unsigned long freq[DIGITS];           // results }; //initialize the array void init_array(unsigned...

  • How do I do this C++ in a Unix Environment assignment Given dot1m.c 1. The program (dot1m.c) uses...

    How do I do this C++ in a Unix Environment assignment Given dot1m.c 1. The program (dot1m.c) uses mutex to lock and unlock the shared resource (dotstr.sum) for access control as shown below. pthread_mutex_lock (&mutexsum); dotstr.sum += mysum; printf("Thread %ld did %d to %d: mysum=%f global sum=%f\n", offset,start,end,mysum,dotstr.sum); pthread_mutex_unlock (&mutexsum); 2. Modify dot1m.c program to use reader-writer lock (instead of mutex).      Replace the codes (for mutex) by the codes (for reader-writer lock).            To initialize reader-writer lock, pthread_rwlock_initializer.            At the end,...

  • 1. (50 pts) Write a C or C++ program A6p1.c(pp) that accepts one command line argument which is an integer...

    1. (50 pts) Write a C or C++ program A6p1.c(pp) that accepts one command line argument which is an integer n between 2 and 6 inclusive. Generate a string of 60 random upper case English characters and store them somewhere (e.g. in a char array). Use pthread to create n threads to convert the string into a complementary string ('A'<>'Z', 'B'<->'Y', 'C''X', etc). You should divide this conversion task among the n threads as evenly as possible, Print out the...

  • In C using the following 2 files to create a 3rd file that uses multiple threads...

    In C using the following 2 files to create a 3rd file that uses multiple threads to improve performance. Split the array into pieces and each piece is handled by a different thread. Use 8 threads. run and compile in linux. #include <stdio.h> #include <sys/time.h> #define BUFFER_SIZE 4000000 int countPrime=0; int numbers[BUFFER_SIZE]; int isPrime(int n) { int i; for(i=2;i<n;i++) if (n%i==0) return 0; return 1; } int main() { int i; // fill the buffer for(i=0;i<BUFFER_SIZE;i++) numbers[i] = (i+100)%100000; //...

  • 1) Compile thread2.c (remember the -lpthread flag). Run it numerous times, and notice the output usually...

    1) Compile thread2.c (remember the -lpthread flag). Run it numerous times, and notice the output usually differs. a) Why is the variable myglobal usually not 40? Be specific, be precise. b) In what special case would myglobal be 40? Be specific, be precise. #include <pthread.h> #include <stdlib.h> #include <unistd.h> #include <stdio.h> #include <fcntl.h> /* Purpose: Use 2 threads to increment myglobal exactly 40 times in total. Compile: using -pthread option */ int myglobal = 0; void *thread_function(void *arg) {   ...

  • Pleas help I need to create and array to add to my code something like this...

    Pleas help I need to create and array to add to my code something like this for (i = 0; i < NUM_THREADS; ++i) { thr_data[i].tid = i; if ((rc = pthread_create(&thr[i], NULL, thr_func, &thr_data[i]))) { fprintf(stderr, "error: pthread_create, rc: %d\n", rc); return EXIT_FAILURE; ::::::::: CODE ::::::::::::: #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <pthread.h>    int sharedVar = 0; pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; /* thread handler */ void *threadHandler(void *vargp) {    int i = 0;    pthread_mutex_lock(&mutex);   ...

  • Please explain your answers thoroughly for the following question. 1) Compile thread2.c (remember the -lpthread flag)....

    Please explain your answers thoroughly for the following question. 1) Compile thread2.c (remember the -lpthread flag). Run it numerous times, and notice the output usually differs. a) Why is the variable myglobal usually not 40? Be specific, be precise. b) In what special case would myglobal be 40? Be specific, be precise. #include <pthread.h> #include <stdlib.h> #include <unistd.h> #include <stdio.h> #include <fcntl.h> /* Purpose: Use 2 threads to increment myglobal exactly 40 times in total. Compile: using -pthread option */...

  • Please change this 2 thread program to a 4 thread program. /*compile as "gcc thread.c -pthread"...

    Please change this 2 thread program to a 4 thread program. /*compile as "gcc thread.c -pthread" */ #include <pthread.h> #include <stdio.h> #include <time.h> #define SIZE 100000000 //100 M //#define SIZE 10000 #define NUMBER_OF_TIMES 100 float a[SIZE]; typedef struct {        int start;        int end;        double sum;        int pid;    } range; void *thread_function(void *arg) //define a function that will be executed from //within a thread {    range *incoming = (range *) arg;...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT