Eu tenho q faze um programa q faz multiplicação de matrizes so q usando threads... em C para linux... vendo alguns sides do meu professor.. ja fiz qse tudo... so q no final... o programa da segment fault (core dumped) o codigo segue abaixo: #include #include #include #include #define MAX_THRDS 4 //numero de processadores #define max 1000 //tam. max. arquivo ``` float a[max][max], b[max][max], c[max][max]; int n,nprocs; ``` void readdata() { ``` int i,j; FILE *fpa,*fpb; ``` /* read matrix a */ ``` fpa = fopen("a","r"); for (i=0; i < n; i++) for (j=0; j < n; j++) fscanf(fpa,"%f", &a[i][j]); fclose(fpa); ``` /* read matrix b */ ``` fpb = fopen("b","r"); for (i=0; i < n; i++) for (j=0; j < n; j++) fscanf(fpb,"%f", &b[i][j]); fclose(fpb); } ``` void printdata() { ``` int i,j; FILE *fpc; ``` /* write results */ ``` fpc = fopen("thread_c","w"); for (i=0; i < n; i++) for (j = 0; j < n; j++) fprintf(fpc,"%f\n",c[i][j]); fclose(fpc); } ``` void matmul(int *num_thread) //funcao que multiplica..threads a chamam. { ``` int i, j, k; int iprocs, jprocs; int my_id, i_id,j_id,ilb,iub,jlb,jub; ``` /* number of processors in i direction */ iprocs = (int) sqrt((double) nprocs); /* number of processors in j direction */ ``` jprocs = nprocs / iprocs; my_id = *num_thread; //m_get_myid(); ``` /* get processor ID in i and j dimensions */ ``` i_id = my_id % iprocs; j_id = my_id / iprocs; ``` /* find lower and upper bounds of i loop */ ``` ilb = i_id * n / iprocs; iub = (i_id + 1) * (n / iprocs); ``` /* find lower and upper bounds of j loop */ ``` jlb = j_id * n / jprocs; jub = (j_id + 1) * (n / jprocs); for (i = ilb; i < iub; i++) for (j = jlb; j < jub; j++) { c[i][j] = 0.0; for (k = 0; k < n; k++) c[i][j] = c[i][j] + a[i][k] * b [k][j]; } pthread_exit (NULL); } ``` int main(int argc, char **argv) { ``` pthread_t t[MAX_THRDS]; pthread_attr_t attr; int param[MAX_THRDS]; int i; void readdata(),matmul(),printdata(); ``` //inicializacao das threads ``` pthread_attr_init(&attr); pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE); pthread_attr_setscope(&attr,PTHREAD_SCOPE_SYSTEM); ``` /* get n and nprocs parameters */ ``` if (argc != 3){ printf("usage: pth_matrix \n"); exit(1); } n = atoi(argv[1]); nprocs = atoi(argv[2]); ``` /* reads matrix a and b */ readdata(); /* create threads */ ``` for (i=0; i < nprocs; i++){ param[i]=i; pthread_create(&t[i], &attr, (void *)matmul, ¶m[i]); } ``` /* wait termination of created threads */ ``` for (i=0; i < nprocs; i++) pthread_join(t[i], NULL); ``` /* outputs matrix c */ ``` printdata(); return (0); } ``` Se alguem puder me ajudar eu apreciaria mto! abraços

saulokada

LISP - Remover todas ocorrencias de um elemento na lista

[Resolvido] Multiplicação de Matrizes usando Threads em C