mirror of
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484 lines
13 KiB
C
484 lines
13 KiB
C
/**
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* @file
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* Stack-internal timers implementation.
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* This file includes timer callbacks for stack-internal timers as well as
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* functions to set up or stop timers and check for expired timers.
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*
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*/
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/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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* Simon Goldschmidt
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*
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*/
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#include "lwip/opt.h"
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#include "lwip/timers.h"
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#if LWIP_TIMERS
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#include "lwip/def.h"
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#include "lwip/memp.h"
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#include "lwip/tcpip.h"
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#include "lwip/tcp_impl.h"
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#include "lwip/ip_frag.h"
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#include "netif/etharp.h"
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#include "lwip/dhcp.h"
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#include "lwip/autoip.h"
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#include "lwip/igmp.h"
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#include "lwip/dns.h"
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/** The one and only timeout list */
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static struct sys_timeo *next_timeout;
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#if NO_SYS
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static u32_t timeouts_last_time;
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#endif /* NO_SYS */
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#if LWIP_TCP
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/** global variable that shows if the tcp timer is currently scheduled or not */
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static int tcpip_tcp_timer_active;
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/**
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* Timer callback function that calls tcp_tmr() and reschedules itself.
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*
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* @param arg unused argument
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*/
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static void
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tcpip_tcp_timer(void *arg)
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{
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LWIP_UNUSED_ARG(arg);
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/* call TCP timer handler */
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tcp_tmr();
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/* timer still needed? */
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if (tcp_active_pcbs || tcp_tw_pcbs) {
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/* restart timer */
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sys_timeout(TCP_TMR_INTERVAL, tcpip_tcp_timer, NULL);
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} else {
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/* disable timer */
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tcpip_tcp_timer_active = 0;
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}
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}
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/**
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* Called from TCP_REG when registering a new PCB:
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* the reason is to have the TCP timer only running when
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* there are active (or time-wait) PCBs.
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*/
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void
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tcp_timer_needed(void)
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{
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/* timer is off but needed again? */
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if (!tcpip_tcp_timer_active && (tcp_active_pcbs || tcp_tw_pcbs)) {
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/* enable and start timer */
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tcpip_tcp_timer_active = 1;
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sys_timeout(TCP_TMR_INTERVAL, tcpip_tcp_timer, NULL);
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}
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}
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#endif /* LWIP_TCP */
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#if IP_REASSEMBLY
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/**
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* Timer callback function that calls ip_reass_tmr() and reschedules itself.
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*
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* @param arg unused argument
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*/
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static void
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ip_reass_timer(void *arg)
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{
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LWIP_UNUSED_ARG(arg);
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LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: ip_reass_tmr()\n"));
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ip_reass_tmr();
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sys_timeout(IP_TMR_INTERVAL, ip_reass_timer, NULL);
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}
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#endif /* IP_REASSEMBLY */
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#if LWIP_ARP
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/**
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* Timer callback function that calls etharp_tmr() and reschedules itself.
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*
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* @param arg unused argument
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*/
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static void
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arp_timer(void *arg)
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{
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LWIP_UNUSED_ARG(arg);
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LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: etharp_tmr()\n"));
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etharp_tmr();
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sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
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}
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#endif /* LWIP_ARP */
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#if LWIP_DHCP
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/**
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* Timer callback function that calls dhcp_coarse_tmr() and reschedules itself.
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*
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* @param arg unused argument
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*/
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static void
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dhcp_timer_coarse(void *arg)
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{
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LWIP_UNUSED_ARG(arg);
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LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: dhcp_coarse_tmr()\n"));
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dhcp_coarse_tmr();
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sys_timeout(DHCP_COARSE_TIMER_MSECS, dhcp_timer_coarse, NULL);
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}
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/**
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* Timer callback function that calls dhcp_fine_tmr() and reschedules itself.
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*
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* @param arg unused argument
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*/
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static void
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dhcp_timer_fine(void *arg)
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{
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LWIP_UNUSED_ARG(arg);
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LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: dhcp_fine_tmr()\n"));
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dhcp_fine_tmr();
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sys_timeout(DHCP_FINE_TIMER_MSECS, dhcp_timer_fine, NULL);
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}
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#endif /* LWIP_DHCP */
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#if LWIP_AUTOIP
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/**
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* Timer callback function that calls autoip_tmr() and reschedules itself.
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*
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* @param arg unused argument
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*/
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static void
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autoip_timer(void *arg)
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{
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LWIP_UNUSED_ARG(arg);
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LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: autoip_tmr()\n"));
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autoip_tmr();
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sys_timeout(AUTOIP_TMR_INTERVAL, autoip_timer, NULL);
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}
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#endif /* LWIP_AUTOIP */
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#if LWIP_IGMP
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/**
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* Timer callback function that calls igmp_tmr() and reschedules itself.
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*
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* @param arg unused argument
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*/
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static void
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igmp_timer(void *arg)
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{
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LWIP_UNUSED_ARG(arg);
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LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: igmp_tmr()\n"));
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igmp_tmr();
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sys_timeout(IGMP_TMR_INTERVAL, igmp_timer, NULL);
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}
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#endif /* LWIP_IGMP */
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#if LWIP_DNS
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/**
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* Timer callback function that calls dns_tmr() and reschedules itself.
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*
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* @param arg unused argument
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*/
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static void
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dns_timer(void *arg)
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{
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LWIP_UNUSED_ARG(arg);
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LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: dns_tmr()\n"));
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dns_tmr();
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sys_timeout(DNS_TMR_INTERVAL, dns_timer, NULL);
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}
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#endif /* LWIP_DNS */
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/** Initialize this module */
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void sys_timeouts_init(void)
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{
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#if IP_REASSEMBLY
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sys_timeout(IP_TMR_INTERVAL, ip_reass_timer, NULL);
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#endif /* IP_REASSEMBLY */
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#if LWIP_ARP
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sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
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#endif /* LWIP_ARP */
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#if LWIP_DHCP
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sys_timeout(DHCP_COARSE_TIMER_MSECS, dhcp_timer_coarse, NULL);
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sys_timeout(DHCP_FINE_TIMER_MSECS, dhcp_timer_fine, NULL);
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#endif /* LWIP_DHCP */
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#if LWIP_AUTOIP
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sys_timeout(AUTOIP_TMR_INTERVAL, autoip_timer, NULL);
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#endif /* LWIP_AUTOIP */
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#if LWIP_IGMP
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sys_timeout(IGMP_TMR_INTERVAL, igmp_timer, NULL);
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#endif /* LWIP_IGMP */
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#if LWIP_DNS
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sys_timeout(DNS_TMR_INTERVAL, dns_timer, NULL);
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#endif /* LWIP_DNS */
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#if NO_SYS
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/* Initialise timestamp for sys_check_timeouts */
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timeouts_last_time = sys_now();
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#endif
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}
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/**
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* Create a one-shot timer (aka timeout). Timeouts are processed in the
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* following cases:
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* - while waiting for a message using sys_timeouts_mbox_fetch()
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* - by calling sys_check_timeouts() (NO_SYS==1 only)
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*
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* @param msecs time in milliseconds after that the timer should expire
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* @param h callback function to call when msecs have elapsed
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* @param arg argument to pass to the callback function
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*/
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#if LWIP_DEBUG_TIMERNAMES
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void
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sys_timeout_debug(u32_t msecs, sys_timeout_handler h, void *arg, const char* handler_name)
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#else /* LWIP_DEBUG_TIMERNAMES */
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void
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sys_timeout(u32_t msecs, sys_timeout_handler h, void *arg)
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#endif /* LWIP_DEBUG_TIMERNAMES */
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{
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struct sys_timeo *timeout, *t;
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timeout = (struct sys_timeo *)memp_malloc(MEMP_SYS_TIMEOUT);
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if (timeout == NULL) {
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LWIP_ASSERT("sys_timeout: timeout != NULL, pool MEMP_SYS_TIMEOUT is empty", timeout != NULL);
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return;
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}
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timeout->next = NULL;
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timeout->h = h;
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timeout->arg = arg;
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timeout->time = msecs;
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#if LWIP_DEBUG_TIMERNAMES
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timeout->handler_name = handler_name;
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#endif /* LWIP_DEBUG_TIMERNAMES */
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if (next_timeout == NULL) {
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next_timeout = timeout;
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return;
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}
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if (next_timeout->time > msecs) {
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next_timeout->time -= msecs;
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timeout->next = next_timeout;
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next_timeout = timeout;
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} else {
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for(t = next_timeout; t != NULL; t = t->next) {
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timeout->time -= t->time;
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if (t->next == NULL || t->next->time > timeout->time) {
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if (t->next != NULL) {
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t->next->time -= timeout->time;
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}
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timeout->next = t->next;
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t->next = timeout;
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break;
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}
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}
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}
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}
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/**
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* Go through timeout list (for this task only) and remove the first matching
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* entry, even though the timeout has not triggered yet.
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*
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* @note This function only works as expected if there is only one timeout
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* calling 'h' in the list of timeouts.
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*
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* @param h callback function that would be called by the timeout
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* @param arg callback argument that would be passed to h
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*/
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void
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sys_untimeout(sys_timeout_handler h, void *arg)
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{
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struct sys_timeo *prev_t, *t;
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if (next_timeout == NULL) {
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return;
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}
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for (t = next_timeout, prev_t = NULL; t != NULL; prev_t = t, t = t->next) {
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if ((t->h == h) && (t->arg == arg)) {
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/* We have a match */
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/* Unlink from previous in list */
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if (prev_t == NULL) {
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next_timeout = t->next;
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} else {
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prev_t->next = t->next;
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}
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/* If not the last one, add time of this one back to next */
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if (t->next != NULL) {
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t->next->time += t->time;
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}
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memp_free(MEMP_SYS_TIMEOUT, t);
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return;
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}
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}
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return;
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}
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#if NO_SYS
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/** Handle timeouts for NO_SYS==1 (i.e. without using
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* tcpip_thread/sys_timeouts_mbox_fetch(). Uses sys_now() to call timeout
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* handler functions when timeouts expire.
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*
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* Must be called periodically from your main loop.
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*/
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void
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sys_check_timeouts(void)
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{
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struct sys_timeo *tmptimeout;
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u32_t diff;
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sys_timeout_handler h;
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void *arg;
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int had_one;
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u32_t now;
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#if LWIP_DEBUG_TIMERNAMES
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const char *handler_name;
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#endif /* LWIP_DEBUG_TIMERNAMES */
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now = sys_now();
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if (next_timeout) {
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/* this cares for wraparounds */
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diff = LWIP_U32_DIFF(now, timeouts_last_time);
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do
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{
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had_one = 0;
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tmptimeout = next_timeout;
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if (tmptimeout->time <= diff) {
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/* timeout has expired */
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had_one = 1;
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timeouts_last_time = now;
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diff -= tmptimeout->time;
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next_timeout = tmptimeout->next;
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h = tmptimeout->h;
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arg = tmptimeout->arg;
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#if LWIP_DEBUG_TIMERNAMES
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handler_name = tmptimeout->handler_name;
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#endif /* LWIP_DEBUG_TIMERNAMES */
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memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
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if (h != NULL) h(arg);
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}
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/* repeat until all expired timers have been called */
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}while(had_one);
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}
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}
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/** Set back the timestamp of the last call to sys_check_timeouts()
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* This is necessary if sys_check_timeouts() hasn't been called for a long
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* time (e.g. while saving energy) to prevent all timer functions of that
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* period being called.
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*/
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void
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sys_restart_timeouts(void)
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{
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timeouts_last_time = sys_now();
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}
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#else /* NO_SYS */
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/**
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* Wait (forever) for a message to arrive in an mbox.
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* While waiting, timeouts are processed.
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*
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* @param mbox the mbox to fetch the message from
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* @param msg the place to store the message
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*/
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void
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sys_timeouts_mbox_fetch(sys_mbox_t *mbox, void **msg)
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{
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u32_t time_needed;
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struct sys_timeo *tmptimeout;
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sys_timeout_handler h;
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void *arg;
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#if LWIP_DEBUG_TIMERNAMES
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const char *handler_name;
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#endif /* LWIP_DEBUG_TIMERNAMES */
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again:
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if (!next_timeout) {
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time_needed = sys_arch_mbox_fetch(mbox, msg, 0);
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} else {
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if (next_timeout->time > 0) {
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time_needed = sys_arch_mbox_fetch(mbox, msg, next_timeout->time);
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} else {
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time_needed = SYS_ARCH_TIMEOUT;
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}
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if (time_needed == SYS_ARCH_TIMEOUT) {
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/* If time == SYS_ARCH_TIMEOUT, a timeout occured before a message
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could be fetched. We should now call the timeout handler and
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deallocate the memory allocated for the timeout. */
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tmptimeout = next_timeout;
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next_timeout = tmptimeout->next;
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h = tmptimeout->h;
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arg = tmptimeout->arg;
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#if LWIP_DEBUG_TIMERNAMES
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handler_name = tmptimeout->handler_name;
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#endif /* LWIP_DEBUG_TIMERNAMES */
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memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
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if (h != NULL) {
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#if LWIP_DEBUG_TIMERNAMES
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LWIP_DEBUGF(TIMERS_DEBUG, ("stmf calling h=%p(%p) (%s)\n", *(void**)&h, arg, handler_name));
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#else /* LWIP_DEBUG_TIMERNAMES */
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LWIP_DEBUGF(TIMERS_DEBUG, ("stmf calling h=%p(%p)\n", *(void**)&h, arg));
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#endif /* LWIP_DEBUG_TIMERNAMES */
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/* For LWIP_TCPIP_CORE_LOCKING, lock the core before calling the
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timeout handler function. */
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LOCK_TCPIP_CORE();
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h(arg);
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UNLOCK_TCPIP_CORE();
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}
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LWIP_TCPIP_THREAD_ALIVE();
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/* We try again to fetch a message from the mbox. */
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goto again;
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} else {
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/* If time != SYS_ARCH_TIMEOUT, a message was received before the timeout
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occured. The time variable is set to the number of
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milliseconds we waited for the message. */
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if (time_needed < next_timeout->time) {
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next_timeout->time -= time_needed;
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} else {
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next_timeout->time = 0;
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}
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}
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}
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}
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#endif /* NO_SYS */
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#else /* LWIP_TIMERS */
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/* Satisfy the TCP code which calls this function */
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void
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tcp_timer_needed(void)
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{
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}
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#endif /* LWIP_TIMERS */
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