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/* ecmfactor.c - example of use of the ECM library.
Copyright 2005-2016 Paul Zimmermann, Dave Newman, Pierrick Gaudry.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not, see
http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <gmp.h> /* GMP header file */
#include <ecm.h> /* ecm header file */
/* thread structure */
typedef struct
{
mpz_t n; /* number to factor */
double B1; /* stage-1 bound */
mpz_t f; /* potential factor */
int ret; /* return value */
ecm_params q;
} __tab_struct;
typedef __tab_struct tab_t[1];
void*
one_thread (void *args)
{
tab_t *tab = (tab_t*) args;
tab[0]->ret = ecm_factor (tab[0]->f, tab[0]->n, tab[0]->B1, tab[0]->q);
return NULL;
}
int
main (int argc, char *argv[])
{
mpz_t n;
double B1;
unsigned long nthreads = 1, i;
tab_t *T;
pthread_t *tid;
if (argc >= 3 && strcmp (argv[1], "-t") == 0)
{
nthreads = strtoul (argv[2], NULL, 10);
argc -= 2;
argv += 2;
}
if (argc < 3)
{
fprintf (stderr, "Usage: ecmfactor [-t nnn] <number> <B1>\n");
exit (1);
}
/* initialize tab_t for threads */
T = malloc (nthreads * sizeof (tab_t));
tid = malloc (nthreads * sizeof (pthread_t));
mpz_init (n);
/* read number on command line */
if (mpz_set_str (n, argv[1], 10))
{
fprintf (stderr, "Invalid number: %s\n", argv[1]);
exit (1);
}
B1 = atof (argv[2]);
for (i = 0; i < nthreads ; i++)
{
mpz_init_set (T[i]->n, n);
T[i]->B1 = B1;
mpz_init (T[i]->f);
ecm_init (T[i]->q);
}
printf ("Performing %lu curve(s) with B1=%1.0f\n", nthreads, B1);
for (i = 0; i < nthreads; i++)
pthread_create (&tid[i], NULL, one_thread, (void *) (T+i));
for (i = 0; i < nthreads; i++)
pthread_join (tid[i], NULL);
for (i = 0; i < nthreads; i++)
{
gmp_printf ("thread %lu with sigma %d:%Zd ",
i, T[i]->q->param, T[i]->q->sigma);
if (T[i]->ret > 0)
gmp_printf ("found factor in step %u: %Zd\n", T[i]->ret, T[i]->f);
else if (T[i]->ret == ECM_NO_FACTOR_FOUND)
printf ("found no factor\n");
else
printf ("gave an error\n");
mpz_clear (T[i]->n);
mpz_clear (T[i]->f);
ecm_clear (T[i]->q);
}
mpz_clear (n);
free (T);
free (tid);
return 0;
}
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