src/charon/threads/scheduler.c

   1 /**
   2  * @file scheduler.c
   3  *
   4  * @brief Implementation of scheduler_t.
   5  *
   6  */
   7
   8 /*
   9  * Copyright (C) 2005-2006 Martin Willi
  10  * Copyright (C) 2005 Jan Hutter
  11  * Hochschule fuer Technik Rapperswil
  12  *
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License as published by the
  15  * Free Software Foundation; either version 2 of the License, or (at your
  16  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  17  *
  18  * This program is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  20  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  21  * for more details.
  22  */
  23
  24 #include <stdlib.h>
  25 #include <pthread.h>
  26
  27 #include "scheduler.h"
  28
  29 #include <daemon.h>
  30 #include <queues/job_queue.h>
  31
  32
  33 typedef struct private_scheduler_t private_scheduler_t;
  34
  35 /**
  36  * Private data of a scheduler_t object.
  37  */
  38 struct private_scheduler_t {
  39         /**
  40          * Public part of a scheduler_t object.
  41          */
  42          scheduler_t public;
  43
  44         /**
  45          * Assigned thread.
  46          */
  47         pthread_t assigned_thread;
  48 };
  49
  50 /**
  51  * Implementation of private_scheduler_t.get_events.
  52  */
  53 static void get_events(private_scheduler_t * this)
  54 {
  55         job_t *current_job;
  56
  57         /* cancellation disabled by default */
  58         pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
  59
  60         DBG1(DBG_JOB, "scheduler thread running, thread_ID: %06u",
  61                  (int)pthread_self());
  62
  63         while (TRUE)
  64         {
  65                 DBG2(DBG_JOB, "waiting for next event...");
  66                 /* get a job, this block until one is available */
  67                 current_job = charon->event_queue->get(charon->event_queue);
  68                 /* queue the job in the job queue, workers will eat them */
  69                 DBG2(DBG_JOB, "got event, adding job %N to job-queue",
  70                          job_type_names, current_job->get_type(current_job));
  71                 charon->job_queue->add(charon->job_queue, current_job);
  72         }
  73 }
  74
  75 /**
  76  * Implementation of scheduler_t.destroy.
  77  */
  78 static void destroy(private_scheduler_t *this)
  79 {
  80         pthread_cancel(this->assigned_thread);
  81         pthread_join(this->assigned_thread, NULL);
  82         free(this);
  83 }
  84
  85 /*
  86  * Described in header.
  87  */
  88 scheduler_t * scheduler_create()
  89 {
  90         private_scheduler_t *this = malloc_thing(private_scheduler_t);
  91
  92         this->public.destroy = (void(*)(scheduler_t*)) destroy;
  93
  94         if (pthread_create(&(this->assigned_thread), NULL, (void*(*)(void*))get_events, this) != 0)
  95         {
  96                 /* thread could not be created  */
  97                 free(this);
  98                 charon->kill(charon, "unable to create scheduler thread");
  99         }
 100
 101         return &(this->public);
 102 }