#include "population.h"
#include <stdlib.h>
+#include <errno.h>
#include <stdint.h>
#include <inttypes.h>
#include <string.h>
#include <limits.h>
#include <pthread.h>
#include <math.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
/*
* Data types
pi_serialize_f serialize;
pi_unserialize_f unserialize;
+ int *peers;
+ size_t peers_num;
+
individual_t fittest;
individual_t *individuals;
};
/*
+ * Private functions
+ */
+static int population_send_to_peer (population_t *p, void *pi) /* {{{ */
+{
+ char buffer[1450];
+ size_t buffer_size;
+ size_t buffer_free;
+ char *buffer_ptr;
+
+ int fd;
+ int i;
+ int status;
+
+ if (p == NULL)
+ return (-1);
+
+ if (pi == NULL)
+ return (-1);
+
+ buffer_size = sizeof (buffer);
+ memset (buffer, 0, buffer_size);
+
+ pthread_mutex_lock (&p->lock);
+
+ if (p->serialize == NULL)
+ {
+ pthread_mutex_unlock (&p->lock);
+ fprintf (stderr, "population_send_to_peer: Cannot send to peer without "
+ "serialization function!\n");
+ return (-1);
+ }
+
+ i = (int) (((double) p->peers_num) * (rand() / (RAND_MAX + 1.0)));
+ fd = p->peers[i];
+
+ buffer_ptr = buffer;
+ buffer_free = sizeof (buffer);
+ status = p->serialize (pi, &buffer_ptr, &buffer_free);
+ if (status != 0)
+ {
+ pthread_mutex_unlock (&p->lock);
+ fprintf (stderr, "population_send_to_peer: p->serialize failed "
+ "with status %i.\n", status);
+ return (-1);
+ }
+
+ buffer_size = sizeof (buffer) - buffer_free;
+ if (buffer_size < 1)
+ {
+ pthread_mutex_unlock (&p->lock);
+ fprintf (stderr, "population_send_to_peer: p->serialize didn't put "
+ "anything into the buffer..\n");
+ return (-1);
+ }
+
+ /* write should not block - hopefully */
+ status = send (fd, buffer, buffer_size, MSG_DONTWAIT | MSG_NOSIGNAL);
+ if (status < 0)
+ {
+ pthread_mutex_unlock (&p->lock);
+ status = errno;
+ if (status != ECONNREFUSED)
+ {
+ fprintf (stderr, "population_send_to_peer: Writing to socket failed: "
+ "send(2) returned with error %i.\n", status);
+ }
+ return (-1);
+ }
+ else if (((size_t) status) != buffer_size)
+ {
+ pthread_mutex_unlock (&p->lock);
+ fprintf (stderr, "population_send_to_peer: Writing to socket failed: "
+ "send(2) returned %i (expected %zu).\n",
+ status, buffer_size);
+ return (-1);
+ }
+
+ pthread_mutex_unlock (&p->lock);
+ return (0);
+} /* }}} int population_send_to_peer */
+
+/*
* Constructor and destructor
*/
population_t *population_create (pi_rate_f rate, pi_copy_f copy, /* {{{ */
return (0);
} /* }}} int population_set_serialization */
+int population_add_peer (population_t *p, const char *node, /* {{{ */
+ const char *port)
+{
+ struct addrinfo ai_hints;
+ struct addrinfo *ai_list;
+ struct addrinfo *ai_ptr;
+ int status;
+
+ if (p == NULL)
+ return (-1);
+
+ if (node == NULL)
+ return (-1);
+
+ if (port == NULL)
+ port = POPULATION_DEFAULT_PORT;
+
+ ai_list = NULL;
+
+ memset (&ai_hints, 0, sizeof (ai_hints));
+ ai_hints.ai_flags = 0;
+#ifdef AI_ADDRCONFIG
+ ai_hints.ai_flags |= AI_ADDRCONFIG;
+#endif
+ ai_hints.ai_family = AF_UNSPEC;
+ ai_hints.ai_socktype = SOCK_DGRAM;
+ ai_hints.ai_protocol = 0;
+
+ status = getaddrinfo (node, port, &ai_hints, &ai_list);
+ if (status != 0)
+ {
+ fprintf (stderr, "population_add_peer: getaddrinfo (%s) failed: %s\n",
+ node, gai_strerror (status));
+ return (-1);
+ }
+
+ pthread_mutex_lock (&p->lock);
+
+ for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
+ {
+ int *temp;
+
+ temp = (int *) realloc (p->peers, sizeof (int) * (p->peers_num + 1));
+ if (temp == NULL)
+ {
+ fprintf (stderr, "population_add_peer: realloc failed.\n");
+ continue;
+ }
+ p->peers = temp;
+
+ p->peers[p->peers_num] = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
+ ai_ptr->ai_protocol);
+ if (p->peers[p->peers_num] < 0)
+ continue;
+
+ status = connect (p->peers[p->peers_num],
+ ai_ptr->ai_addr, ai_ptr->ai_addrlen);
+ if (status != 0)
+ {
+ fprintf (stderr, "population_add_peer: connect(2) failed.\n");
+ close (p->peers[p->peers_num]);
+ continue;
+ }
+
+ status = fcntl (p->peers[p->peers_num], F_SETFL, O_NONBLOCK);
+ if (status != 0)
+ {
+ fprintf (stderr, "population_add_peer: fcntl (F_SETFL, O_NONBLOCK) "
+ "failed. Will use the socket with blocking.\n");
+ }
+
+ p->peers_num++;
+ }
+ pthread_mutex_unlock (&p->lock);
+
+ freeaddrinfo (ai_list);
+
+ return (0);
+} /* }}} int population_add_peer */
+
void *population_get_random (population_t *p) /* {{{ */
{
void *ret = NULL;
pthread_mutex_lock (&p->lock);
+ if (p->peers_num > 0)
+ {
+ double prob;
+
+ prob = ((double) rand ()) / (((double) RAND_MAX) + 1.0);
+ if (prob < 0.01)
+ {
+ pthread_mutex_unlock (&p->lock);
+ population_send_to_peer (p, pi);
+ pthread_mutex_lock (&p->lock);
+ }
+ }
+
/* Keep track of the all time best. */
if ((p->fittest.ptr == NULL) || (p->fittest.rating > pi_rating))
{