matrizMult.c

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

#define NUM_THREADS 2     
#define LINHAS 3
#define COLUNAS 3


int matriz1[3][3] = { {1, 2,5}, {3, 4,2}, {5, 6,1} };
int matriz2[3][3] = {{1, 2,5}, {3, 4,2},  {5, 6,1} };
int resultado[3][3];
  

void *threadCode(void *tid){   
	
	int i, j, k;
  	int threadId = (*(int *)tid); 
	
	for(i=threadId; i < LINHAS; i = i + NUM_THREADS) {
	   	      	
      	for (j=0;j<COLUNAS;j++) {
		    resultado[i][j] = 0;
  
       		for(k=0;k< COLUNAS;k++) {
           		resultado[i][j] = resultado[i][j] + matriz1[i][k] * matriz2[k][j];
       		}
      	}			
       
    }
  
}

int main (int argc, char *argv[]){   
	pthread_t threads[NUM_THREADS]; 
  	int *taskids[NUM_THREADS];
	int i, j, u, t;   
	
  	for(t=0; t<NUM_THREADS; t++){
    	printf("No main: criando thread %d\n", t);    
    	taskids[t] = (int *) malloc(sizeof(int)); *taskids[t] = t;
	 	pthread_create(&threads[t],NULL,threadCode, (void *)taskids[t]);         
  	}
  
  	for(u=0; u<NUM_THREADS;u++) {
    	int *res;
    	pthread_join(threads[u], NULL);
  	}   
  
  	for(i=0; i < LINHAS; i++) {
		for(j=0;j<COLUNAS;j++) {
      		printf("%d\t", resultado[i][j]);
  		}
  		 
  		printf("\n");
   	}
        		
  
  	pthread_exit(NULL);
}