//==========================================================================
//
//      net/timers.c
//
//      Stand-alone networking support for RedBoot
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####                                            
// -------------------------------------------                              
// This file is part of eCos, the Embedded Configurable Operating System.   
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos 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 or (at your option) any later      
// version.                                                                 
//
// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,    
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            
//
// As a special exception, if other files instantiate templates or use      
// macros or inline functions from this file, or you compile this file      
// and link it with other works to produce a work based on this file,       
// this file does not by itself cause the resulting work to be covered by   
// the GNU General Public License. However the source code for this file    
// must still be made available in accordance with section (3) of the GNU   
// General Public License v2.                                               
//
// This exception does not invalidate any other reasons why a work based    
// on this file might be covered by the GNU General Public License.         
// -------------------------------------------                              
// ####ECOSGPLCOPYRIGHTEND####                                              
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    gthomas
// Contributors: gthomas
// Date:         2000-07-14
// Purpose:      
// Description:  
//              
// This code is part of RedBoot (tm).
//
//####DESCRIPTIONEND####
//
//==========================================================================

#include <net/net.h>

static timer_t *tmr_list;


/*
 * Set a timer. Caller is responsible for providing the timer_t struct.
 */
void
__timer_set(timer_t *t, unsigned long delay,
	    tmr_handler_t handler, void *user_data)
{
    timer_t *p;

    t->delay = delay;
    t->start = MS_TICKS();
    t->handler = handler;
    t->user_data = user_data;

    for (p = tmr_list; p; p = p->next)
	if (p == t) {
	    return;
	}

    t->next = tmr_list;
    tmr_list = t;
}


/*
 * Remove a given timer from timer list.
 */
void
__timer_cancel(timer_t *t)
{
    timer_t *prev, *p;

    for (prev = NULL, p = tmr_list; p; prev = p, p = p->next)
	if (p == t) {
	    if (prev)
		prev->next = p->next;
	    else
		tmr_list = p->next;
	    return;
	}
}


/*
 * Poll timer list for timer expirations.
 */
void
__timer_poll(void)
{
    timer_t *prev, *t;

    prev = NULL;
    t = tmr_list;
    while (t) {
	if ((MS_TICKS_DELAY() - t->start) >= t->delay) {

	    /* remove it before calling handler */
	    if (prev)
		prev->next = t->next;
	    else
		tmr_list = t->next;
	    /* now, call the handler */
	    t->handler(t->user_data);
	    
	    /*
	     * handler may be time consuming, so start
	     * from beginning of list.
	     */
	    prev = NULL;
	    t = tmr_list;
	} else {
	    prev = t;
	    t = t->next;
	}
    }
}