Anutter juan, C (gcc)

Anutter juan

#include <stdio.h>
#include <math.h>
#include <sys/mman.h>
#include <pthread.h>
#include <malloc.h>
#include <stdlib.h>

double a[18][16]; //first array 
double b[16][18]; //second array
double c[18][18]; // The result

%how to pseudo this code?

struct thread_info {
int detail; // The difference is the stakes.

};

%Completes the arthimetic for one element of a product of matrix multiplication. 
void *compute_C_ij(void *arg)
{ 
int i, j, k, sum, col, row;
   
%information necessary to be passed is row of a and col of b. and which C value it is. 
    
for (i = 0; i < 18; i++) {
      for (j = 0; j < 18; j++) {
        for (k = 0; k < 16; k++) {
          sum = sum + a[i][k]*b[k][j];
        }
 
        c[i][j] = sum;
        sum = 0;
      }
    }
return(c); %or the pointer for C. 
}

int main(int argc, char *argv[])
{
	
pthread_t loads[NTHREADS];
int no_of_threads;
	
int i,j;

/% Might not be of any use either. 
%%%%%%%%%%%%borrowed from lab 3.3 - reduced to matrixes to simplify the code. 
   pthread_t thread[];

thread_info_t info[];

info[].maxitr = (int)maxitr;
   info[].op = '+';
   
  
   if (pthread_create(&thread[], NULL, &func, &info[]) != 0) {
           printf("Error in creating thread 1\n");
           exit(1);
   }

pthread_join(thread[], NULL);
   printf("Exec time for thread[] = %lf sec\n", info[].exec_time);
   
  
   pthread_exit(NULL);
%/
%load.c was not useful. My apologises.

double a[18][16]; //arrays
double b[16][18]; // arrays

%initializing

for(i=0; i<18; i++){
	for(j=0; j<16; j++){
		a[i][j] = i+j;
	}
}
 
for(i=0; i<16; i++){
	for(j=0; j<18; j++){
		b[i][j] = i+(2*j);
	}
}

%this is from load.c Want to recycle the lines below to run the threads to solve for the matrix concurrently. 
	
	for (i = 0; i < 18; i++) {
		
            for (j = 0; j < 18; j++) {
                if (pthread_create(&loads[i], NULL, &compute_C_ij, &i) != 0) {
			
                printf("Error creating thread %d.%d\n", i, j);
                }    
            }
	}

pthread_exit(NULL);

printf("The Result of matrix multiplication a * b is: \n");
for(i=0; i<18; i++){
	for(j=0; j<18; j++){
		printf("%d\t", c[i][j]);
	}
	printf("\n");
}

printf("The Diagonal of matrix multiplication a * b is: \n");
    for(i=0; i<18; i++){
		printf("%d", c[i][i]);
	printf("\n");
}

}


run \| edit \| history \| help	0