/*
  * $Id$

  *
  * Copyright (C) 2001-2003 Fhg Fokus
  *
  * This file is part of ser, a free SIP server.
  *
  * ser is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version
  *
  * For a license to use the ser software under conditions
  * other than those described here, or to purchase support for this
  * software, please contact iptel.org by e-mail at the following addresses:
  *    info@iptel.org
  *
  * ser is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License 
  * along with this program; if not, write to the Free Software 
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  */

 /* History:
  * --------
  *  2003-03-19  replaced all the mallocs/frees w/ pkg_malloc/pkg_free (andrei)

  *  2003-03-29  cleaning pkg_mallocs introduced (jiri)

  */

 #include "timer.h"
 #include "dprint.h"
 #include "error.h"
 #include "config.h"

 #include "mem/mem.h"

 #ifdef SHM_MEM

 #include "mem/shm_mem.h"

 #endif

 
 #include <stdlib.h>
 
 
 struct sr_timer* timer_list=0;
 

 static int* jiffies=0;

 static int timer_id=0;
 

 
 
 /* ret 0 on success, <0 on error*/
 int init_timer()
 {
 #ifdef SHM_MEM
 	jiffies=shm_malloc(sizeof(int));
 #else
 	/* in this case get_ticks won't work! */
 	LOG(L_INFO, "WARNING: no shared memory support compiled in"
 				" get_ticks won't work\n");

 	jiffies=pkg_malloc(sizeof(int));

 #endif
 	if (jiffies==0){
 		LOG(L_CRIT, "ERROR: init_timer: could not init jiffies\n");
 		return E_OUT_OF_MEM;
 	}
 	*jiffies=0;
 	return 0;
 }
 
 
 

 void destroy_timer()
 {

 	struct sr_timer* t, *foo;
 

 	if (jiffies){
 #ifdef SHM_MEM
 		shm_free(jiffies); jiffies=0;
 #else

 		pkg_free(jiffies); jiffies=0;

 #endif
 	}

 
 	t=timer_list;
 	while(t) {
 		foo=t->next;
 		pkg_free(t);
 		t=foo;
 	}

 }
 
 
 

 /*register a periodic timer;

  * ret: <0 on error
  * Hint: if you need it in a module, register it from mod_init or it 
  * won't work otherwise*/

 int register_timer(timer_function f, void* param, unsigned int interval)
 {
 	struct sr_timer* t;
 

 	t=pkg_malloc(sizeof(struct sr_timer));

 	if (t==0){
 		LOG(L_ERR, "ERROR: register_timer: out of memory\n");
 		goto error;
 	}
 	t->id=timer_id++;
 	t->timer_f=f;
 	t->t_param=param;
 	t->interval=interval;

 	t->expires=*jiffies+interval;

 	/* insert it into the list*/
 	t->next=timer_list;
 	timer_list=t;
 	return t->id;
 
 error:
 	return E_OUT_OF_MEM;
 }
 
 
 
 void timer_ticker()
 {
 	struct sr_timer* t;
 	unsigned int prev_jiffies;
 	

 	prev_jiffies=*jiffies;
 	*jiffies+=TIMER_TICK;

 	/* test for overflow (if tick= 1s =>overflow in 136 years)*/

 	if (*jiffies<prev_jiffies){ 

 		/*force expire & update every timer, a little buggy but it 
 		 * happens once in 136 years :) */
 		for(t=timer_list;t;t=t->next){

 			t->expires=*jiffies+t->interval;
 			t->timer_f(*jiffies, t->t_param);

 		}
 		return;
 	}
 	
 	for (t=timer_list;t; t=t->next){

 		if (*jiffies>=t->expires){
 			t->expires=*jiffies+t->interval;
 			t->timer_f(*jiffies, t->t_param);

 		}
 	}
 }

 
 
 
 unsigned int get_ticks()
 {

 	if (jiffies==0){
 		LOG(L_CRIT, "BUG: get_ticks: jiffies not intialized\n");
 		return 0;
 	}
 #ifndef SHM_MEM
 	LOG(L_CRIT, "WARNING: get_ticks: no shared memory support compiled in"
 			", returning 0 (probably wrong)");
 	return 0;
 #endif
 	return *jiffies;

 }