struct distrenjob *distrenjob_ptr;

  found = 0;

  while(!found)

    {

      /* enumerate through priority levels */

      for(priority = 10;

        priority > 0

            && !found;

           priority --)

	/* Find the job with the highest priority */

        for(distrenjob_ptr = head;

            distrenjob_ptr != NULL

            && !found;

            distrenjob_ptr = distrenjob_ptr->next)

          if(distrenjob_ptr->priority == priority)

	    found = 1;

      if(!found)

        {

          fprintf(stderr, "No more jobs to render\n");

          return 1;

        }

      found = 0;

      for(your_frame = 0;

        your_frame < distrenjob_ptr->total_frames;

        your_frame ++)

        if(distrenjob_ptr->frameset[your_frame].status == 0)

          found = 1;

      if(!found)

        {

          /* there are no frames left in this job */

          distrenjob_ptr->priority --;

	  /* If that job had no open frames for some reason, run the status report generator so that */

          status_report_generator(&head);

          /* should the job be removed now? */

          fprintf(stderr, "Job %d is finished, this is probably the place to call the job-removal function\n", distrenjob_ptr->jobnum);

          /* @TODO: At this point, all slaves should be instructed to delete the source data for this job. */

        }

    }

  /* Sets the value of the frame to 1, which means it is taken */

  distrenjob_ptr->frameset[your_frame].status++;

  distrenjob_ptr->frameset[your_frame].start_time = clock();

  *job = distrenjob_ptr;

  *frame =  &distrenjob_ptr->frameset[your_frame];

  return 0;

}

/** Checks for dead, laggy, or stale slaves */

void blend_frame_watchdog(struct distrenjob *distrenjob_head)

{

  unsigned short int watchdog_forgiveness; /*< seconds to wait on a frame before re-assigning it */

  struct distrenjob *distrenjob_ptr;

  unsigned int counter;

  watchdog_forgiveness = 1; /*< hours of forgiveness before frame is re-assigned @TODO: Make this more user-configurable (maybe per-job), 3 hours is a LONG time */

  distrenjob_ptr = distrenjob_head;

  for(distrenjob_ptr = distrenjob_head; distrenjob_ptr; distrenjob_ptr = distrenjob_ptr->next)

    /* iterate through jobs */

    for(counter = 0; counter < distrenjob_ptr->total_frames; counter ++)

      /* iterate through all frames for this job*/

      {

        if((distrenjob_ptr->frameset[counter].start_time + (watchdog_forgiveness * 3600)) < clock())

          /*

            If frame is not completed within the number of hours specified by watchdog_forgiveness

            Then change the frame status to unassigned

           */

          distrenjob_ptr->frameset[counter].status = 0;

      }

}

/**

   Finds a distrenjob struct based on the jobnum

   @arg jobnum job number to search for

   @return NULL on job doesn't exist

 */

struct distrenjob *distrenjob_get(struct distrenjob *head, jobnum_t jobnum)

{

  struct distrenjob *distrenjob_ptr;

  /*

    The conditions of the for loop will leave distrenjob_ptr at NULL if the end of the list is reached. It will leave it pointing to the correct job if it is found.

   */

  for(distrenjob_ptr = head;

      distrenjob_ptr

        && distrenjob_ptr->jobnum != jobnum;

      distrenjob_ptr = distrenjob_ptr->next);

  return distrenjob_ptr;

}

/**

   Removes a distrenjob from the distrenjob linked list.

   @arg head a double pointer. the head pointer will have to be changed if distrenjob == *head. Thus, make sure that the pointer points to the pointer to the head that all functions use. (I'm going to come back to this and misunderstand myself ;-))

 */

void distrenjob_remove(struct distrenjob **head, struct distrenjob *bj)

{

  struct distrenjob *previous_distrenjob;

  if(bj == *head)

    *head = bj->next;

  else

    {

      for(previous_distrenjob = *head;

        previous_distrenjob

          && previous_distrenjob->next != bj; /*< stop on the distrenjob that comes before bj */

          previous_distrenjob = previous_distrenjob->next)

	/* all of the action is in the definition of the for loop itself */;

      /*

	This removes references to bj from the linked list. I.E., we now skip bj when iterating through the list

       */

      previous_distrenjob->next = bj->next;

    }

}

/* Grabs config info from confs */

int distrend_do_config(int argc, char *argv[], struct distrend_config **config)

{

  cfg_opt_t myopts_listen[] =

    {

      CFG_SIMPLE_STR("type", NULL),

      CFG_SIMPLE_STR("path", NULL),

      CFG_SIMPLE_INT("port", NULL),

      CFG_END()

    };

  cfg_opt_t myopts[] =

    {

      CFG_SEC("listen",  /* this must be imported into struct listens (which must still be declared) */

          myopts_listen,

          CFGF_MULTI),

      CFG_SIMPLE_STR("datadir", NULL),

      CFG_END()

    };

  struct distrenjob *distrenjob;

  int tmp;

  xmlinit();

  /*

   * test xml2distrenjob()

   */

  tmp = xml2distrenjob(&distrenjob, "distrenjob.xml.example");

  if(tmp)

    fprintf(stderr, "xml2distrenjob() returned %d. Try to cd to distren/doc if you want to test out the xml2distrenjob() function. (This will only fix this error if the error is due to an inability of the xml library to access distrenjob.xml.example)\n", tmp);

  else

    fprintf(stderr, "using email ``%s'' for user ``%s'' -- reading in XML files and pulling data from them using libxml2+XPath works!!!\n", distrenjob->email, distrenjob->submitter);

  fprintf(stderr, "%s:%d running config\n", __FILE__, __LINE__);

  *config = malloc(sizeof(struct distrend_config));

  myopts[1].simple_value = &(*config)->datadir;

  options_init(argc, argv, &(*config)->mycfg, myopts, "server", &(*config)->options);

  fprintf(stderr, "using %s as datadir\n", (*config)->datadir);

  xmlcleanup();

  return 0;

}

int distrend_config_free(struct distrend_config *config)

{

  options_free(config->options);

  free(config);

  return 0;

}

/* ************************** Main ************************* */

int main(int argc, char *argv[])

{

  /* @TODO: Put some arg-grabbing code here */

  int cont;

  struct distrend_listenset *listenset;

  struct distrend_config *config;

  enum clientstatus

  {

    CLIENTSTATUS_UNINITIALIZED = 0,

    CLIENTSTATUS_BUSY = 1,

    CLIENTSTATUS_IDLE = 2

  } clientstatus;

  cont = 1;

  distrend_do_config(argc, argv, &config);

  distrend_listen(&listenset, config);

  /* This is called the "main loop" */

  while(cont)

    {

      struct distren_action *action;

      int clientsays; /*< temporary example variable, will be replaced when we can handle messages */

      distrend_accept(&action);

      cont = distrend_do(action);

      /* Make the following code more event-driven */

      status_report_generator(&head);

      struct frameset *frame;

      struct distrenjob *job;

      /* If the client is idle, must be modified for climbing through linked list of clients (client->clientnum) */

      if(clientstatus == CLIENTSTATUS_IDLE)

	{

	  if(returnnum)

	    {

	      fprintf(stderr,"No frames are available to render at this time. Idling...\n");

	      sleep(10);

	    }

	  else

	    /* returnnum == 0 */

	    remotio_send_to_client(frame->num, job->jobnum); // Pseudo-sends data to client

	}

      /* If the client states that they finished the frame */

      	if(clientsays == DISTREN_REQUEST_DONEFRAME){

      	  clientstatus = CLIENTSTATUS_IDLE; // Sets the client back to idle

      	}

      distrend_action_free(action);

    }

  distrend_unlisten(listenset);

  distrend_config_free(config);

  return 0;

}