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heartbeat.c

/* --------------------------------------------------------------------------
 *
 * License
 *
 * The contents of this file are subject to the Jabber Open Source License
 * Version 1.0 (the "License").  You may not copy or use this file, in either
 * source code or executable form, except in compliance with the License.  You
 * may obtain a copy of the License at http://www.jabber.com/license/ or at
 * http://www.opensource.org/.  
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * Copyrights
 * 
 * Portions created by or assigned to Jabber.com, Inc. are 
 * Copyright (c) 1999-2000 Jabber.com, Inc.  All Rights Reserved.  Contact
 * information for Jabber.com, Inc. is available at http://www.jabber.com/.
 *
 * Portions Copyright (c) 1998-1999 Jeremie Miller.
 * 
 * Acknowledgements
 * 
 * Special thanks to the Jabber Open Source Contributors for their
 * suggestions and support of Jabber.
 * 
 * --------------------------------------------------------------------------*/
#include "jabberd.h"

/* private heartbeat ring struct */
typedef struct beat_struct
{
    beathandler f;
    void *arg;
    int freq;
    int last;
    pool p;
    struct beat_struct *prev;
    struct beat_struct *next;
} *beat, _beat;

/* master hook for the ring */
beat heartbeat__ring;
pthread_mutex_t heartbeat__sem;
pthread_t heartbeat__t;

void *heartbeat(void *arg)
{
    beat b, b2;
    result r;

    while(1)
    {
      sleep(1);

      /* run through the ring */
      pthread_mutex_lock(&heartbeat__sem);

      if ( jab_shutdown ) break;

      for(b = heartbeat__ring->next; b != heartbeat__ring; b = b->next)
      {
          /* beats can fire on a frequency, just keep a counter */
          if(b->last++ == b->freq)
          {
              b->last = 0;
              r = (b->f)(b->arg);

              if(r == r_UNREG)
              { /* this beat doesn't want to be fired anymore, unlink and free */
                  b2 = b->prev;
                        b->prev->next = b->next;
                        b->next->prev = b->prev;
                        pool_free(b->p);
                        b = b2; /* reset b to accomodate the for loop */
              }
          }
      }
      pthread_mutex_unlock(&heartbeat__sem);
    }

    pthread_mutex_unlock(&heartbeat__sem);

    return NULL;
}

/* register a function to receive heartbeats */
beat new_beat(void)
{
    beat newb;
    pool p;

    p = pool_new();
    newb = pmalloc_x(p, sizeof(_beat), 0);
    newb->p = p;

    return newb;
}

/* register a function to receive heartbeats */
void register_beat(int freq, beathandler f, void *arg)
{
    beat newb;

    if(freq <= 0 || f == NULL || heartbeat__ring == NULL) return; /* uhh, probbably don't want to allow negative heartbeats, since the counter will count infinitly to a core */


    /* setup the new beat */
    newb = new_beat();
    newb->f = f;
    newb->arg = arg;
    newb->freq = freq;
    newb->last = 0;

    /* insert into global ring */
      pthread_mutex_lock(&heartbeat__sem);

    newb->next = heartbeat__ring->next;
    heartbeat__ring->next = newb;
    newb->prev = heartbeat__ring;
    newb->next->prev = newb;

      pthread_mutex_unlock(&heartbeat__sem);
}

/* register a function to receive heartbeats 
   with no sem, use this function in heartbeat thread */
void register_beat_safe(int freq, beathandler f, void *arg)
{
  beat newb;
  
  if(freq <= 0 || f == NULL || heartbeat__ring == NULL) return; /* uhh, probbably don't want to allow negative heartbeats, since the counter will count infinitly to a core */


  /* setup the new beat */
  newb = new_beat();
  newb->f = f;
  newb->arg = arg;
  newb->freq = freq;
  newb->last = 0;
  
  /* insert into global ring */
  newb->next = heartbeat__ring->next;
  heartbeat__ring->next = newb;
  newb->prev = heartbeat__ring;
  newb->next->prev = newb;
}


/* start up the heartbeat */
void heartbeat_birth(void)
{
    /* init the ring */
    heartbeat__ring = new_beat();
    heartbeat__ring->next = heartbeat__ring->prev = heartbeat__ring;

    pthread_mutex_init(&heartbeat__sem,NULL);

    /* start the thread */
    //    pthread_attr_init(&attr);
    //    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
    //    pthread_create(&thread, &attr, heartbeat, NULL);
    pthread_create(&heartbeat__t, NULL, heartbeat, NULL);
    //    pthread_attr_destroy(&attr);
}

void heartbeat_death(void)
{
    beat cur;
    void * ret;

    /* close thread */
    pthread_join(heartbeat__t,&ret);

    pthread_mutex_lock(&heartbeat__sem);
    while(heartbeat__ring != NULL)
    {
       cur = heartbeat__ring;
       if(heartbeat__ring->next == heartbeat__ring) 
       {
           heartbeat__ring = NULL;
       }
       else
       {
           if(heartbeat__ring->next!=NULL)
               heartbeat__ring->next->prev=heartbeat__ring->prev;
           if(heartbeat__ring->prev!=NULL) 
               heartbeat__ring->prev->next=heartbeat__ring->next;
           heartbeat__ring=heartbeat__ring->next;
       }
       pool_free(cur->p);
    }
   pthread_mutex_unlock(&heartbeat__sem);

}


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