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

      	  finish_frame(&general_info, job, frame->num); // @TODO: Make sure this actually works.

      	}

    } /* while(!general_info.config->die) */

  distrend_unlisten(general_info.config->listens, clients);

  distrend_config_free(general_info.config);

  xmlcleanup();

  /** free() paths */

  free(general_info.files.geninfo);

  mysqlDisconnect(conn);

  return 0;

}

/* ********************** Functions ************************* */

/** Dumps all data in RAM to an xml file (such as current jobs, etc) which is parsed by start_data. Remember to invoke this before shutting down! @TODO: Fill this stub*/

int xml_dump()

{

  return 0;

}

/**

   Performs command stored in a client's request. @TODO: Fill stub

*/

int distrend_do()

{

  return 0;

}

/** 

    Fill variables at startup from XML dumps or defaults

 */

int start_data(struct general_info *general_info)

{

  struct stat buffer;

  /**

     defaults

   */

  memset(&general_info->head, '\0', sizeof(struct distrenjob));

  general_info->head.priority = 0;

  general_info->jobs_in_queue = 0;

  general_info->free_clients = 0;

  general_info->rendering_clients = 0;

  general_info->total_finished_jobs = 0;

  general_info->total_frames_rendered = 0;

  general_info->highest_jobnum = 0;

  general_info->hibernate = 0;

  general_info->timestamp = 0;

  general_info->total_render_power = 0;

  general_info->total_priority_pieces = 0;

  fprintf(stderr, "Initialized default global and queue states\n");

  if(stat(general_info->files.geninfo, &buffer) == 0)

    {

      fprintf(stderr, "Previous state file found; loading ``%s'':\n", general_info->files.geninfo);

      fprintf(stderr, "Parsing XML files and restoring previous state...\n");

      if(import_general_info(general_info))

        fprintf(stderr, "FAILURE\n");

      fprintf(stderr, "Restoring queue...\n");

      if(createQueueFromXML(general_info))

        fprintf(stderr, "FAILURE\n");

      fprintf(stderr, "done\n");

    }

  return 0;

}

/** Finish-Setter: Sets a frame to the "completed" status.*/

void finish_frame(struct general_info *geninfo, struct distrenjob *distrenjob, int frame)

{

  distrenjob->frameset[frame].status = FRAMESETSTATUS_DONE;

  distrenjob->total_render_time = distrenjob->total_render_time + (clock() - distrenjob->frameset[frame].start_time);

  distrenjob->completed_frames ++;

  distrenjob->assigned_frames --;

  geninfo->total_frames_rendered ++; /*< Increase total frames var for stats */

  update_general_info(geninfo);

  updateJobStatsXML(distrenjob);

}

/**

   checks to see if a job is actually done.

   - scans the folder of the job to make sure all output files are present

*/

int mortition(struct general_info *geninfo, struct distrenjob *job)

{

  short int isJobDone;

  int counter;

  char *path_and_number;

  struct stat buffer;

  isJobDone = 1;

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

    {

      _distren_asprintf(&path_and_number, "%s/stor/job%d/out/%d.%s",

                        geninfo->config->datadir,

                        job->jobnum,

                        job->frameset[counter].num,

                        job->output_format);

      if(stat(path_and_number, &buffer) == -1)

        {

          /**

             missing frame found

           */

          job->frameset[counter].status = FRAMESETSTATUS_UNASSIGNED;

          job->completed_frames--;

          geninfo->total_frames_rendered--;

          isJobDone = 0;

    {

      /**

         all frames were accounted for

      */

      distrenjob_remove(geninfo, job);

      distrenjob_free(&job);

      update_xml_joblist(geninfo);

    }

  else

    /**

       if the job isn't done, have frame_finder() start from the first frame, allowing it to see the frames that are now unassigned 

    */

    job->prev_frame_index = -1;

  update_general_info(geninfo);

  return 0;

}

/**

   scans the frames of a job to initialize a job after server

   @return 0 if the job is completely done and there are no missing frames,

           1 if missing frames are found.

*/

int restoreJobState(struct distrenjob *job)

{

  short int isJobDone;

  int counter;

  char *path_and_number;

  struct stat buffer;

  isJobDone = 1;

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

    {

      _distren_asprintf(&path_and_number, "stor/job%d/out/%d.%s", job->jobnum, job->frameset[counter].num, job->output_format); /*< @TODO this path is used in multiple places, construct/build/determine it in a central function */

      if(stat(path_and_number, &buffer) == 0)

        {

          job->frameset[counter].status = FRAMESETSTATUS_ASSIGNED;

          job->completed_frames++;

        }

      else

        isJobDone = 0;

      free(path_and_number);

    }

  return !isJobDone;

}

/**

   creates a structure from starting data, then calls another

   function to actually add that struct to the queue.

   Passed strings must be free()d by the caller.

*/

int prepare_distrenjob(struct general_info *geninfo, int type, char *name, char *submitter, int priority, int start_frame, int end_frame, int width, int height)

{

  int counter;

  int counter2;

  int tmp;

  char *serialfile;

  struct distrenjob *distrenjob;

  tmp = distrenjob_new(&distrenjob);

  if(tmp)

    return 1;

  geninfo->highest_jobnum ++;

  distrenjob->jobnum = geninfo->highest_jobnum;

  distrenjob->type = 1;

  distrenjob->name = strdup(name);

  distrenjob->submitter = strdup(submitter);

  distrenjob->priority = priority;

  distrenjob->width = width;

  distrenjob->height = height;

  /** sets the total number of frames in animation for status purposes */

  distrenjob->total_frames = (end_frame - start_frame + 1);

  distrenjob->frameset = malloc(sizeof(struct frameset) * distrenjob->total_frames);

  */

  fprintf(stderr, "prepare_distrenjob(): attempting distrenjob_serialize(%d, \"%s\")\n",

          distrenjob->jobnum, serialfile);

  distrenjob_serialize(distrenjob, serialfile);

  free(serialfile);

  fprintf(stderr, "prepare_distrenjob(): attempting distrenjob_enqueue()\n");

  distrenjob_enqueue(geninfo, distrenjob);

  fprintf(stderr, "prepare_distrenjob(): attempting update_xml_joblist()\n");

  update_xml_joblist(geninfo);

  fprintf(stderr, "prepare_distrenjob(): attempting update_general_info()\n");

  update_general_info(geninfo);

  fprintf(stderr, "prepare_distrenjob(): attempting updateJobStatsXML()\n");

  updateJobStatsXML(distrenjob);

  return 0;

}

/**

   Adds the job to the queue based on its priority.

   Updates geninfo->jobs_in_queue.

*/

int distrenjob_enqueue(struct general_info *geninfo, struct distrenjob *job)

{

  struct distrenjob *prev_job;

  struct distrenjob *current_job;

  struct distrenjob *head;

  head = &geninfo->head;

  prev_job = head;

  /**

     iterate through linked jobs

  */

  for(current_job = head->next; current_job; current_job = current_job->next)

  {

    fprintf(stderr, "enqueue loop iteration\n");

    if(job->priority < current_job->priority)

      {

        /**

           if job's priority is less than current_job's priority, insert job

           keep in mind 1 is the highest priority given to jobs, head has a

           priority of zero so it will always be before other jobs

        */

        prev_job->next = job;

        job->next = current_job;

        fprintf(stderr, "added job before jobname: ``%s''\n", current_job->name);

        geninfo->jobs_in_queue ++;

        return 0;

      }

    prev_job = current_job;

  }

  /**

     if it has reached the end of the list, add job there

  */

  prev_job->next = job;

  fprintf(stderr, "added job at end of queue\n");

  geninfo->jobs_in_queue ++;

  return 0;

}

/** Changes the priority of an existing (and maybe running) job. @arg head I may end up changing the head if job == head */

int change_job_priority(struct general_info *geninfo, struct distrenjob *job, int new_priority){

  struct distrenjob *current_job;

  struct distrenjob *prev_job;

  char *serialname;

  distrenjob_remove(geninfo, job);

  job->priority = new_priority;

  prev_job = &geninfo->head;

  if(job->frameset[0].status == FRAMESETSTATUS_UNASSIGNED)

    /**

       if job was not yet started

    */

    {

      distrenjob_enqueue(geninfo, job);

      return 0;

    }

  /**

     iterate through linked list of jobs 

  */

    for(current_job = &geninfo->head;

        current_job != NULL

          && job->priority > current_job->priority;

        current_job = current_job->next)

      prev_job = current_job;

    prev_job->next = job;

    job->next = current_job;

  update_xml_joblist(geninfo);

  /** reserialize after changes */

  job_getserialfilename(&serialname, geninfo, job->jobnum, 0);

  distrenjob_serialize(job, serialname);

  free(serialname);

  return 0;

}

/**

  Frame Finder: matches your computer up with a lovely frame to render, starts looking at oldest job first

  @TODO: We must return both jobnum and framenum

  @TODO: Add calls in main()

  @return 0 success, other: error

*/

int find_jobframe(struct general_info *geninfo, struct distrenjob **job, struct frameset **frame)

{

  if(geninfo->hibernate)

    return 1;

  unsigned int frame_counter;

  unsigned short int found;

  struct distrenjob *distrenjob_ptr;

  found = 0;

  /* iterate through jobs from first to last */

  for(distrenjob_ptr = geninfo->head.next; distrenjob_ptr && !distrenjob_ptr->hibernate; distrenjob_ptr = distrenjob_ptr->next)

  {

    for(frame_counter = (distrenjob_ptr->prev_frame_index + 1); frame_counter < distrenjob_ptr->total_frames; frame_counter ++)

    {

      if(distrenjob_ptr->frameset[frame_counter].status == FRAMESETSTATUS_UNASSIGNED) // jobframe found

      {

        found = 1;

        distrenjob_ptr->frameset[frame_counter].status = FRAMESETSTATUS_ASSIGNED;

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

        distrenjob_ptr->assigned_frames++;

        distrenjob_ptr->prev_frame_index = frame_counter;

        updateJobStatsXML(distrenjob_ptr);

      }

      if(found)

        break;

    }

    if(found)

      break;

  }

  if(!found)

    {

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

      sleep(1); /*< @todo eliminate the need for this line*/

      return 1;

    }

  *job = distrenjob_ptr;

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

  return 0;

}

int find_jobframe_from_job(struct distrenjob *distrenjob_ptr, struct distrenjob **job, struct frameset **frame)

{

  unsigned int frame_counter;

  unsigned short int found;

  found = 0;

  for(frame_counter = (distrenjob_ptr->prev_frame_index + 1); frame_counter < distrenjob_ptr->total_frames; frame_counter ++)

  {

    if(distrenjob_ptr->frameset[frame_counter].status == FRAMESETSTATUS_UNASSIGNED) // jobframe found

      {

        found = 1;

                distrenjob_ptr->frameset[frame_counter].status = FRAMESETSTATUS_ASSIGNED;

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

                distrenjob_ptr->assigned_frames++;

                distrenjob_ptr->prev_frame_index = frame_counter;

                updateJobStatsXML(distrenjob_ptr);

      }

    if(found)

      break;

  }

  if(!found)

    {

      fprintf(stderr, "No more frames in this job number %d", distrenjob_ptr->jobnum);

      distrenjob_ptr->prev_frame_index = frame_counter;

      return 1;

    }

  *job = distrenjob_ptr;

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

  return 0;

}

// find a frame to render when the job that the last frame was for no longer exists

int find_jobframe_new(struct general_info *geninfo, int rend_pwr, struct distrenjob **job, struct frameset **frame)

{

  if(geninfo->hibernate)

    return 1;

  float power_difference;

  float greatest_power_difference;

  unsigned short int found;

  struct distrenjob *job_to_render;

  struct distrenjob *distrenjob_ptr;

  greatest_power_difference = -10000;

  found = 0;

  /* iterate through jobs from first to last */

  for(distrenjob_ptr = geninfo->head.next;

      distrenjob_ptr && !distrenjob_ptr->hibernate;

      distrenjob_ptr = distrenjob_ptr->next)

  {

          if(distrenjob_ptr->prev_frame_index < (distrenjob_ptr->total_frames - 1))

          {

            /**

               Why is the number 11 found here again? --ohnobinki

             */

                  fprintf(stderr, "job num %d\npower difference: %f\n", distrenjob_ptr->jobnum, power_difference);

                  if(power_difference > greatest_power_difference)

                  {

                          job_to_render = distrenjob_ptr;

                          greatest_power_difference = power_difference;

                          found = 1;

                  }

          }

  }

  if(!found)

    {

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

      return 1;

    }

  find_jobframe_from_job(job_to_render, job, frame);

  job_to_render->assigned_render_power = job_to_render->assigned_render_power + rend_pwr;

  return 0;

}

// gets a frame to render from the same job that the previously rendered frame was from

int find_jobframe_again(struct general_info *geninfo, int jobnum, int rend_pwr, struct distrenjob **job, struct frameset **frame)

{

  if(geninfo->hibernate)

    return 1;

  short int found;

  struct distrenjob *distrenjob_ptr;

  distrenjob_ptr = distrenjob_get(&geninfo->head, jobnum);

  // if the job was not found or there are no frames left in the job...

  if(!distrenjob_ptr || distrenjob_ptr->prev_frame_index >= (distrenjob_ptr->total_frames - 1))

    {

      fprintf(stderr, "Job number %d has been finished, finding new job\n", jobnum);

      // if previous job isn't yet finished the render power of the slave is removed from it

      if(distrenjob_ptr)

          distrenjob_ptr->assigned_render_power = distrenjob_ptr->assigned_render_power - rend_pwr;

      return find_jobframe_new(geninfo, rend_pwr, job, frame);

    }

  found = 0;

  found = find_jobframe_from_job(distrenjob_ptr, job, frame);

    /* if the job has been started, checks by seeing if either to first or second frame has been started */

    if(distrenjob_ptr->frameset[0].status != FRAMESETSTATUS_UNASSIGNED || distrenjob_ptr->frameset[1].status != FRAMESETSTATUS_UNASSIGNED)

      /* iterate through all frames for this job: */

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

            /*watchdog_forgiveness = seconds of forgiveness before frame is re-assigned: */

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

        {

            /*

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

            Then change the frame status to unassigned

            */

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

            distrenjob_ptr->assigned_frames--;

        }

    updateJobStatsXML(distrenjob_ptr);

  }

}

/**

   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. It does not free the

   distrenjob, however. You should do that with distrenjob_free() from distrenjob.h.

   Updates geninfo->jobs_in_queue.

   @arg head pointer to the head of the linkedlist of distrenjobs

 */

void distrenjob_remove(struct general_info *geninfo, struct distrenjob *bj)

{

  struct distrenjob *previous_distrenjob;

  for(previous_distrenjob = &geninfo->head;

      previous_distrenjob

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

      previous_distrenjob = previous_distrenjob->next)

    ;

  /*

    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;

  geninfo->jobs_in_queue --;

}

/* Grabs config info from confs */

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

{

  unsigned int counter;

  general_info->jobs_in_queue = atoi((char*)xmlNodeListGetString(doc, cur->xmlChildrenNode, 1));

  cur = cur->next;

  general_info->total_finished_jobs = atoi((char*)xmlNodeListGetString(doc, cur->xmlChildrenNode, 1));

  cur = cur->next;

  general_info->total_frames_rendered = atoi((char*)xmlNodeListGetString(doc, cur->xmlChildrenNode, 1));

  cur = cur->next;

  general_info->highest_jobnum = atoi((char*)xmlNodeListGetString(doc, cur->xmlChildrenNode, 1));

  general_info->hibernate = 0;

  general_info->free_clients = 0;

  general_info->rendering_clients = 0;

  general_info->timestamp = 0;

  general_info->total_render_power = 0;

  general_info->total_priority_pieces = 0;

  xmlFreeDoc(doc);

  return 0;

}

/**

   determines path to the distenjob XML file and

   calls distrenjob_unserialize()

 */

int restore_distrenjob(struct general_info *geninfo, struct distrenjob **distrenjob, jobnum_t jobnum)

{

  int tmp;

  char *file_name;

  tmp = job_getserialfilename(&file_name, geninfo, jobnum, 0);

  if(tmp)

    return tmp;

  tmp = distrenjob_unserialize(distrenjob, file_name);

  if(tmp)

    fprintf(stderr, "failed to load job %d from ``%s''\n",

            jobnum, file_name);

  free(file_name);

  return tmp;

}

int updateJobStatsXML(struct distrenjob *job)

{

          xmlTextWriterPtr writer;

          char *tmp;

          _distren_asprintf(&tmp, "stor/job%d/stats.xml", job->jobnum);

          /**

             create xml document at the location tmp with no compression

          */

          writer = xmlNewTextWriterFilename(tmp, 0);

          free(tmp);

          xmlTextWriterStartDocument(writer, NULL, "utf-8", NULL);

          xmlTextWriterStartElement(writer, (xmlChar*)"stats");

          _distren_asprintf(&tmp, "%d", job->assigned_frames);

          xmlTextWriterWriteAttribute(writer, (xmlChar*)"assigned_frames", (xmlChar*)tmp);

          free(tmp);

          _distren_asprintf(&tmp, "%d", job->completed_frames);

          xmlTextWriterWriteAttribute(writer, (xmlChar*)"completed_frames", (xmlChar*)tmp);

          free(tmp);

          _distren_asprintf(&tmp, "%d", job->total_render_time);

          xmlTextWriterWriteAttribute(writer, (xmlChar*)"total_render_time", (xmlChar*)tmp);

          free(tmp);

          /**

             end document

          */

          xmlTextWriterEndDocument(writer);

          /**

             free writer and save xml file to disk

             @TODO confirma that calling xmlFreeTextWriter calls

                   write() and close(), respectively.

                   (close() causes asynchronous writes to be

                   completed).

          */

          xmlFreeTextWriter(writer);

          return 1;

}

/**

   updates job_list.xml which lists all the jobs in the queue

   @return 0 means success

*/

int update_xml_joblist(struct general_info *geninfo)

{

  struct distrenjob *job;

  xmlTextWriterPtr writer;

  char *tmp;

  int counter;

  /**

     update timestamp

  */

  geninfo->timestamp ++;

  if(geninfo->timestamp > 65530)

    geninfo->timestamp = 0;

  _distren_asprintf(&tmp, "%s/job_list.xml",

                    geninfo->config->datadir);

  writer = xmlNewTextWriterFilename(tmp, 0);

  free(tmp);

  xmlTextWriterStartDocument(writer, NULL, "utf-8", NULL);

  /**

     create root element job_list

  */

      geninfo->total_priority_pieces = geninfo->total_priority_pieces + job->priority;

      counter++;

    }

  xmlTextWriterEndElement(writer);

  /**

     close elements and end document

  */

  xmlTextWriterEndDocument(writer);

  /**

     free writer and save xml file to disk

  */

  xmlFreeTextWriter(writer);

  return 0;

}

/**

 returns 0 if completed successfully

 this reads a list of jobs in the queue before DistRen was shut down

 and then adds the jobs to the queue, as if it were never shut down

*/

int createQueueFromXML(struct general_info *geninfo)

{

  int tmp;

  xmlDocPtr doc;

  xmlNodePtr cur;

  char *xmllist_path;

  /**

     load xml document

  */

  _distren_asprintf(&xmllist_path, "%s/job_list.xml", geninfo->config->datadir);

  doc = xmlParseFile(xmllist_path);

  if(doc == NULL)

    {

      fprintf(stderr, "createQueueFromXML: ``%s'' could not be not loaded\n",

              xmllist_path);

      free(xmllist_path);

      return 1;

    }

  free(xmllist_path);

  if(xmlStrcmp(cur->name, (const xmlChar*)"job_list"))

    {

      fprintf(stderr, "createQueueFromXML: incorrect root element (%s)", (char*)cur->name);

    }

  else

    fprintf(stderr, "USING %s\n", cur->name);

  /**

     moves into the children elements of job_list

  */

  cur = cur->xmlChildrenNode;

  tmp = reCreateQueueFromXML(geninfo, doc, cur);

  xmlFreeDoc(doc);

  return tmp;

}

/**

   inserts jobs at front of queue, starting

   with the last job in the job_list xml file

   to preserve the order of the queue

*/

int reCreateQueueFromXML(struct general_info *geninfo, xmlDocPtr doc, xmlNodePtr current)

{

  struct distrenjob *holder; // holds the job that "was" after head, so that the new struct can be inserted after head

  struct distrenjob *job; // job to be added

  xmlChar *tmp;

  jobnum_t job_num;

  if(current == NULL) // base case, if element doesn't exist then don't do anything

    return 0;

  /**

     recursively call itself so that the next job in

     the queue is added to the front before the current one

  */

  if(reCreateQueueFromXML(geninfo, doc, current->next))

    /**

       bail if failure recursevely

        ^-- is this the best thing to do in this case?

        @TODO bail-out cleanup

     */

    return 1;

  /** actual work is done now: add the job to the front of the queue */

  holder = geninfo->head.next;