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/**
* @file
* System time and timeout system
*
*/
/*
* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Author: Simon Kallweit <simon.kallweit(at)intefo.ch>
*/
#include "lwip/mem.h"
#include "netif/ppp/ppp.h"
#include "netif/ppp/timesys.h"
/* Milliseconds per jiffy */
#define MS_PER_JIFFY 10
/* PPP timeout */
struct ppp_timeout {
struct ppp_timeout *next;
ppp_timeout_handler_t handler;
void *arg;
u32_t timeout;
};
/* Current system time in ms */
static u32_t current_time;
/* Linked list of timeouts */
static struct ppp_timeout *timeouts;
/*
* Initialize the timesys.
*/
err_t
ppp_timesys_init(void)
{
return ERR_OK;
}
/*
* Reset the timesys. Removes all timeouts from the list.
*/
void
ppp_timesys_reset(void)
{
struct ppp_timeout *t;
for (t = timeouts; t; t = t->next)
t->handler = NULL;
}
/*
* Update the timesys.
*/
void
ppp_timesys_update(u32_t delta)
{
struct ppp_timeout *t;
current_time += delta;
/* Update timeouts */
for (t = timeouts; t; t = t->next)
if (t->handler) {
if (t->timeout > delta) {
t->timeout -= delta;
} else {
t->handler(t->arg);
t->handler = NULL;
}
}
}
/*
* Returns the current time.
*/
u32_t
ppp_jiffies(void)
{
return current_time / MS_PER_JIFFY;
}
/*
* Setup a timeout.
*/
void
ppp_timeout(ppp_timeout_handler_t handler, void *arg, int timeout)
{
struct ppp_timeout *t;
/* Reuse timeout slot if possible */
for (t = timeouts; t; t = t->next)
if (!t->handler) {
goto setup_timeout;
}
/* Allocate new timeout */
t = mem_malloc(sizeof(struct ppp_timeout));
LWIP_ASSERT("ppp_timeout: t != NULL", t != NULL);
/* Append to list */
t->next = timeouts;
timeouts = t;
setup_timeout:
t->handler = handler;
t->arg = arg;
t->timeout = timeout * 1000;
}
/*
* Clear a timeout.
*/
void
ppp_untimeout(ppp_timeout_handler_t handler, void *arg)
{
struct ppp_timeout *t;
/* Reuse timeout slot if possible */
for (t = timeouts; t; t = t->next)
if ((t->handler == handler) && (t->arg == arg)) {
t->handler = NULL;
}
}
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