[164] | 1 | /**
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| 2 | * @file
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| 3 | * Stack-internal timers implementation.
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| 4 | * This file includes timer callbacks for stack-internal timers as well as
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| 5 | * functions to set up or stop timers and check for expired timers.
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| 6 | *
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| 7 | */
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| 8 |
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| 9 | /*
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| 10 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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| 11 | * All rights reserved.
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| 12 | *
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| 13 | * Redistribution and use in source and binary forms, with or without modification,
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| 14 | * are permitted provided that the following conditions are met:
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| 15 | *
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| 16 | * 1. Redistributions of source code must retain the above copyright notice,
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| 17 | * this list of conditions and the following disclaimer.
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| 18 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 19 | * this list of conditions and the following disclaimer in the documentation
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| 20 | * and/or other materials provided with the distribution.
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| 21 | * 3. The name of the author may not be used to endorse or promote products
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| 22 | * derived from this software without specific prior written permission.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 25 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 26 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 27 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 28 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 29 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 30 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 31 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 32 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 33 | * OF SUCH DAMAGE.
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| 34 | *
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| 35 | * This file is part of the lwIP TCP/IP stack.
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| 36 | *
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| 37 | * Author: Adam Dunkels <adam@sics.se>
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| 38 | * Simon Goldschmidt
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| 39 | *
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| 40 | */
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| 41 |
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| 42 | #include "lwip/opt.h"
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| 43 |
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| 44 | #include "lwip/timers.h"
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| 45 | #include "lwip/tcp_impl.h"
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| 46 |
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| 47 | #if LWIP_TIMERS
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| 48 |
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| 49 | #include "lwip/def.h"
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| 50 | #include "lwip/memp.h"
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| 51 | #include "lwip/tcpip.h"
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| 52 |
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| 53 | #include "lwip/ip_frag.h"
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| 54 | #include "netif/etharp.h"
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| 55 | #include "lwip/dhcp.h"
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| 56 | #include "lwip/autoip.h"
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| 57 | #include "lwip/igmp.h"
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| 58 | #include "lwip/dns.h"
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| 59 | #include "lwip/sys.h"
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| 60 | #include "lwip/pbuf.h"
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| 61 |
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| 62 |
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| 63 | /** The one and only timeout list */
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| 64 | static struct sys_timeo *next_timeout;
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| 65 | #if NO_SYS
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| 66 | static u32_t timeouts_last_time;
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| 67 | #endif /* NO_SYS */
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| 68 |
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| 69 | #if LWIP_TCP
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| 70 | /** global variable that shows if the tcp timer is currently scheduled or not */
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| 71 | static int tcpip_tcp_timer_active;
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| 72 |
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| 73 | /**
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| 74 | * Timer callback function that calls tcp_tmr() and reschedules itself.
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| 75 | *
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| 76 | * @param arg unused argument
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| 77 | */
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| 78 | static void
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| 79 | tcpip_tcp_timer(void *arg)
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| 80 | {
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| 81 | LWIP_UNUSED_ARG(arg);
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| 82 |
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| 83 | /* call TCP timer handler */
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| 84 | tcp_tmr();
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| 85 | /* timer still needed? */
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| 86 | if (tcp_active_pcbs || tcp_tw_pcbs) {
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| 87 | /* restart timer */
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| 88 | sys_timeout(TCP_TMR_INTERVAL, tcpip_tcp_timer, NULL);
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| 89 | } else {
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| 90 | /* disable timer */
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| 91 | tcpip_tcp_timer_active = 0;
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| 92 | }
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| 93 | }
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| 94 |
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| 95 | /**
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| 96 | * Called from TCP_REG when registering a new PCB:
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| 97 | * the reason is to have the TCP timer only running when
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| 98 | * there are active (or time-wait) PCBs.
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| 99 | */
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| 100 | void
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| 101 | tcp_timer_needed(void)
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| 102 | {
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| 103 | /* timer is off but needed again? */
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| 104 | if (!tcpip_tcp_timer_active && (tcp_active_pcbs || tcp_tw_pcbs)) {
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| 105 | /* enable and start timer */
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| 106 | tcpip_tcp_timer_active = 1;
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| 107 | sys_timeout(TCP_TMR_INTERVAL, tcpip_tcp_timer, NULL);
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| 108 | }
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| 109 | }
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| 110 | #endif /* LWIP_TCP */
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| 111 |
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| 112 | #if IP_REASSEMBLY
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| 113 | /**
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| 114 | * Timer callback function that calls ip_reass_tmr() and reschedules itself.
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| 115 | *
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| 116 | * @param arg unused argument
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| 117 | */
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| 118 | static void
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| 119 | ip_reass_timer(void *arg)
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| 120 | {
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| 121 | LWIP_UNUSED_ARG(arg);
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| 122 | LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: ip_reass_tmr()\n"));
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| 123 | ip_reass_tmr();
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| 124 | sys_timeout(IP_TMR_INTERVAL, ip_reass_timer, NULL);
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| 125 | }
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| 126 | #endif /* IP_REASSEMBLY */
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| 127 |
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| 128 | #if LWIP_ARP
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| 129 | /**
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| 130 | * Timer callback function that calls etharp_tmr() and reschedules itself.
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| 131 | *
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| 132 | * @param arg unused argument
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| 133 | */
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| 134 | static void
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| 135 | arp_timer(void *arg)
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| 136 | {
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| 137 | LWIP_UNUSED_ARG(arg);
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| 138 | LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: etharp_tmr()\n"));
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| 139 | etharp_tmr();
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| 140 | sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
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| 141 | }
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| 142 | #endif /* LWIP_ARP */
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| 143 |
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| 144 | #if LWIP_DHCP
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| 145 | /**
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| 146 | * Timer callback function that calls dhcp_coarse_tmr() and reschedules itself.
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| 147 | *
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| 148 | * @param arg unused argument
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| 149 | */
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| 150 | static void
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| 151 | dhcp_timer_coarse(void *arg)
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| 152 | {
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| 153 | LWIP_UNUSED_ARG(arg);
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| 154 | LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: dhcp_coarse_tmr()\n"));
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| 155 | dhcp_coarse_tmr();
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| 156 | sys_timeout(DHCP_COARSE_TIMER_MSECS, dhcp_timer_coarse, NULL);
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| 157 | }
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| 158 |
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| 159 | /**
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| 160 | * Timer callback function that calls dhcp_fine_tmr() and reschedules itself.
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| 161 | *
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| 162 | * @param arg unused argument
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| 163 | */
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| 164 | static void
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| 165 | dhcp_timer_fine(void *arg)
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| 166 | {
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| 167 | LWIP_UNUSED_ARG(arg);
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| 168 | LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: dhcp_fine_tmr()\n"));
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| 169 | dhcp_fine_tmr();
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| 170 | sys_timeout(DHCP_FINE_TIMER_MSECS, dhcp_timer_fine, NULL);
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| 171 | }
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| 172 | #endif /* LWIP_DHCP */
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| 173 |
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| 174 | #if LWIP_AUTOIP
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| 175 | /**
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| 176 | * Timer callback function that calls autoip_tmr() and reschedules itself.
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| 177 | *
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| 178 | * @param arg unused argument
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| 179 | */
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| 180 | static void
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| 181 | autoip_timer(void *arg)
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| 182 | {
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| 183 | LWIP_UNUSED_ARG(arg);
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| 184 | LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: autoip_tmr()\n"));
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| 185 | autoip_tmr();
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| 186 | sys_timeout(AUTOIP_TMR_INTERVAL, autoip_timer, NULL);
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| 187 | }
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| 188 | #endif /* LWIP_AUTOIP */
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| 189 |
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| 190 | #if LWIP_IGMP
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| 191 | /**
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| 192 | * Timer callback function that calls igmp_tmr() and reschedules itself.
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| 193 | *
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| 194 | * @param arg unused argument
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| 195 | */
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| 196 | static void
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| 197 | igmp_timer(void *arg)
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| 198 | {
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| 199 | LWIP_UNUSED_ARG(arg);
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| 200 | LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: igmp_tmr()\n"));
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| 201 | igmp_tmr();
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| 202 | sys_timeout(IGMP_TMR_INTERVAL, igmp_timer, NULL);
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| 203 | }
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| 204 | #endif /* LWIP_IGMP */
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| 205 |
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| 206 | #if LWIP_DNS
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| 207 | /**
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| 208 | * Timer callback function that calls dns_tmr() and reschedules itself.
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| 209 | *
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| 210 | * @param arg unused argument
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| 211 | */
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| 212 | static void
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| 213 | dns_timer(void *arg)
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| 214 | {
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| 215 | LWIP_UNUSED_ARG(arg);
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| 216 | LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: dns_tmr()\n"));
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| 217 | dns_tmr();
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| 218 | sys_timeout(DNS_TMR_INTERVAL, dns_timer, NULL);
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| 219 | }
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| 220 | #endif /* LWIP_DNS */
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| 221 |
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| 222 | /** Initialize this module */
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| 223 | void sys_timeouts_init(void)
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| 224 | {
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| 225 | #if IP_REASSEMBLY
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| 226 | sys_timeout(IP_TMR_INTERVAL, ip_reass_timer, NULL);
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| 227 | #endif /* IP_REASSEMBLY */
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| 228 | #if LWIP_ARP
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| 229 | sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
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| 230 | #endif /* LWIP_ARP */
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| 231 | #if LWIP_DHCP
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| 232 | sys_timeout(DHCP_COARSE_TIMER_MSECS, dhcp_timer_coarse, NULL);
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| 233 | sys_timeout(DHCP_FINE_TIMER_MSECS, dhcp_timer_fine, NULL);
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| 234 | #endif /* LWIP_DHCP */
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| 235 | #if LWIP_AUTOIP
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| 236 | sys_timeout(AUTOIP_TMR_INTERVAL, autoip_timer, NULL);
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| 237 | #endif /* LWIP_AUTOIP */
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| 238 | #if LWIP_IGMP
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| 239 | sys_timeout(IGMP_TMR_INTERVAL, igmp_timer, NULL);
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| 240 | #endif /* LWIP_IGMP */
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| 241 | #if LWIP_DNS
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| 242 | sys_timeout(DNS_TMR_INTERVAL, dns_timer, NULL);
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| 243 | #endif /* LWIP_DNS */
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| 244 |
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| 245 | #if NO_SYS
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| 246 | /* Initialise timestamp for sys_check_timeouts */
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| 247 | timeouts_last_time = sys_now();
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| 248 | #endif
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| 249 | }
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| 250 |
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| 251 | /**
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| 252 | * Create a one-shot timer (aka timeout). Timeouts are processed in the
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| 253 | * following cases:
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| 254 | * - while waiting for a message using sys_timeouts_mbox_fetch()
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| 255 | * - by calling sys_check_timeouts() (NO_SYS==1 only)
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| 256 | *
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| 257 | * @param msecs time in milliseconds after that the timer should expire
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| 258 | * @param handler callback function to call when msecs have elapsed
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| 259 | * @param arg argument to pass to the callback function
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| 260 | */
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| 261 | #if LWIP_DEBUG_TIMERNAMES
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| 262 | void
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| 263 | sys_timeout_debug(u32_t msecs, sys_timeout_handler handler, void *arg, const char* handler_name)
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| 264 | #else /* LWIP_DEBUG_TIMERNAMES */
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| 265 | void
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| 266 | sys_timeout(u32_t msecs, sys_timeout_handler handler, void *arg)
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| 267 | #endif /* LWIP_DEBUG_TIMERNAMES */
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| 268 | {
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| 269 | struct sys_timeo *timeout, *t;
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| 270 |
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| 271 | timeout = (struct sys_timeo *)memp_malloc(MEMP_SYS_TIMEOUT);
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| 272 | if (timeout == NULL) {
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| 273 | LWIP_ASSERT("sys_timeout: timeout != NULL, pool MEMP_SYS_TIMEOUT is empty", timeout != NULL);
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| 274 | return;
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| 275 | }
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| 276 | timeout->next = NULL;
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| 277 | timeout->h = handler;
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| 278 | timeout->arg = arg;
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| 279 | timeout->time = msecs;
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| 280 | #if LWIP_DEBUG_TIMERNAMES
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| 281 | timeout->handler_name = handler_name;
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| 282 | LWIP_DEBUGF(TIMERS_DEBUG, ("sys_timeout: %p msecs=%"U32_F" handler=%s arg=%p\n",
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| 283 | (void *)timeout, msecs, handler_name, (void *)arg));
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| 284 | #endif /* LWIP_DEBUG_TIMERNAMES */
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| 285 |
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| 286 | if (next_timeout == NULL) {
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| 287 | next_timeout = timeout;
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| 288 | return;
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| 289 | }
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| 290 |
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| 291 | if (next_timeout->time > msecs) {
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| 292 | next_timeout->time -= msecs;
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| 293 | timeout->next = next_timeout;
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| 294 | next_timeout = timeout;
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| 295 | } else {
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| 296 | for(t = next_timeout; t != NULL; t = t->next) {
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| 297 | timeout->time -= t->time;
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| 298 | if (t->next == NULL || t->next->time > timeout->time) {
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| 299 | if (t->next != NULL) {
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| 300 | t->next->time -= timeout->time;
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| 301 | }
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| 302 | timeout->next = t->next;
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| 303 | t->next = timeout;
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| 304 | break;
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| 305 | }
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| 306 | }
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| 307 | }
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| 308 | }
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| 309 |
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| 310 | /**
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| 311 | * Go through timeout list (for this task only) and remove the first matching
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| 312 | * entry, even though the timeout has not triggered yet.
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| 313 | *
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| 314 | * @note This function only works as expected if there is only one timeout
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| 315 | * calling 'handler' in the list of timeouts.
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| 316 | *
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| 317 | * @param handler callback function that would be called by the timeout
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| 318 | * @param arg callback argument that would be passed to handler
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| 319 | */
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| 320 | void
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| 321 | sys_untimeout(sys_timeout_handler handler, void *arg)
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| 322 | {
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| 323 | struct sys_timeo *prev_t, *t;
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| 324 |
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| 325 | if (next_timeout == NULL) {
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| 326 | return;
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| 327 | }
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| 328 |
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| 329 | for (t = next_timeout, prev_t = NULL; t != NULL; prev_t = t, t = t->next) {
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| 330 | if ((t->h == handler) && (t->arg == arg)) {
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| 331 | /* We have a match */
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| 332 | /* Unlink from previous in list */
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| 333 | if (prev_t == NULL) {
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| 334 | next_timeout = t->next;
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| 335 | } else {
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| 336 | prev_t->next = t->next;
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| 337 | }
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| 338 | /* If not the last one, add time of this one back to next */
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| 339 | if (t->next != NULL) {
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| 340 | t->next->time += t->time;
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| 341 | }
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| 342 | memp_free(MEMP_SYS_TIMEOUT, t);
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| 343 | return;
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| 344 | }
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| 345 | }
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| 346 | return;
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| 347 | }
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| 348 |
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| 349 | #if NO_SYS
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| 350 |
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| 351 | /** Handle timeouts for NO_SYS==1 (i.e. without using
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| 352 | * tcpip_thread/sys_timeouts_mbox_fetch(). Uses sys_now() to call timeout
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| 353 | * handler functions when timeouts expire.
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| 354 | *
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| 355 | * Must be called periodically from your main loop.
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| 356 | */
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| 357 | void
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| 358 | sys_check_timeouts(void)
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| 359 | {
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| 360 | if (next_timeout) {
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| 361 | struct sys_timeo *tmptimeout;
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| 362 | u32_t diff;
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| 363 | sys_timeout_handler handler;
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| 364 | void *arg;
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| 365 | u8_t had_one;
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| 366 | u32_t now;
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| 367 |
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| 368 | now = sys_now();
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| 369 | /* this cares for wraparounds */
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| 370 | diff = now - timeouts_last_time;
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| 371 | do
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| 372 | {
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| 373 | #if PBUF_POOL_FREE_OOSEQ
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| 374 | PBUF_CHECK_FREE_OOSEQ();
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| 375 | #endif /* PBUF_POOL_FREE_OOSEQ */
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| 376 | had_one = 0;
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| 377 | tmptimeout = next_timeout;
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| 378 | if (tmptimeout && (tmptimeout->time <= diff)) {
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| 379 | /* timeout has expired */
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| 380 | had_one = 1;
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| 381 | timeouts_last_time = now;
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| 382 | diff -= tmptimeout->time;
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| 383 | next_timeout = tmptimeout->next;
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| 384 | handler = tmptimeout->h;
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| 385 | arg = tmptimeout->arg;
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| 386 | #if LWIP_DEBUG_TIMERNAMES
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| 387 | if (handler != NULL) {
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| 388 | LWIP_DEBUGF(TIMERS_DEBUG, ("sct calling h=%s arg=%p\n",
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| 389 | tmptimeout->handler_name, arg));
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| 390 | }
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| 391 | #endif /* LWIP_DEBUG_TIMERNAMES */
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| 392 | memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
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| 393 | if (handler != NULL) {
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| 394 | handler(arg);
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| 395 | }
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| 396 | }
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| 397 | /* repeat until all expired timers have been called */
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| 398 | }while(had_one);
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| 399 | }
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| 400 | }
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| 401 |
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| 402 | /** Set back the timestamp of the last call to sys_check_timeouts()
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| 403 | * This is necessary if sys_check_timeouts() hasn't been called for a long
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| 404 | * time (e.g. while saving energy) to prevent all timer functions of that
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| 405 | * period being called.
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| 406 | */
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| 407 | void
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| 408 | sys_restart_timeouts(void)
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| 409 | {
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| 410 | timeouts_last_time = sys_now();
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| 411 | }
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| 412 |
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| 413 | #else /* NO_SYS */
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| 414 |
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| 415 | /**
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| 416 | * Wait (forever) for a message to arrive in an mbox.
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| 417 | * While waiting, timeouts are processed.
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| 418 | *
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| 419 | * @param mbox the mbox to fetch the message from
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| 420 | * @param msg the place to store the message
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| 421 | */
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| 422 | void
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| 423 | sys_timeouts_mbox_fetch(sys_mbox_t *mbox, void **msg)
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| 424 | {
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| 425 | u32_t time_needed;
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| 426 | struct sys_timeo *tmptimeout;
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| 427 | sys_timeout_handler handler;
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| 428 | void *arg;
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| 429 |
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| 430 | again:
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| 431 | if (!next_timeout) {
|
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| 432 | time_needed = sys_arch_mbox_fetch(mbox, msg, 0);
|
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| 433 | } else {
|
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| 434 | if (next_timeout->time > 0) {
|
---|
| 435 | time_needed = sys_arch_mbox_fetch(mbox, msg, next_timeout->time);
|
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| 436 | } else {
|
---|
| 437 | time_needed = SYS_ARCH_TIMEOUT;
|
---|
| 438 | }
|
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| 439 |
|
---|
| 440 | if (time_needed == SYS_ARCH_TIMEOUT) {
|
---|
| 441 | /* If time == SYS_ARCH_TIMEOUT, a timeout occured before a message
|
---|
| 442 | could be fetched. We should now call the timeout handler and
|
---|
| 443 | deallocate the memory allocated for the timeout. */
|
---|
| 444 | tmptimeout = next_timeout;
|
---|
| 445 | next_timeout = tmptimeout->next;
|
---|
| 446 | handler = tmptimeout->h;
|
---|
| 447 | arg = tmptimeout->arg;
|
---|
| 448 | #if LWIP_DEBUG_TIMERNAMES
|
---|
| 449 | if (handler != NULL) {
|
---|
| 450 | LWIP_DEBUGF(TIMERS_DEBUG, ("stmf calling h=%s arg=%p\n",
|
---|
| 451 | tmptimeout->handler_name, arg));
|
---|
| 452 | }
|
---|
| 453 | #endif /* LWIP_DEBUG_TIMERNAMES */
|
---|
| 454 | memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
|
---|
| 455 | if (handler != NULL) {
|
---|
| 456 | /* For LWIP_TCPIP_CORE_LOCKING, lock the core before calling the
|
---|
| 457 | timeout handler function. */
|
---|
| 458 | LOCK_TCPIP_CORE();
|
---|
| 459 | handler(arg);
|
---|
| 460 | UNLOCK_TCPIP_CORE();
|
---|
| 461 | }
|
---|
| 462 | LWIP_TCPIP_THREAD_ALIVE();
|
---|
| 463 |
|
---|
| 464 | /* We try again to fetch a message from the mbox. */
|
---|
| 465 | goto again;
|
---|
| 466 | } else {
|
---|
| 467 | /* If time != SYS_ARCH_TIMEOUT, a message was received before the timeout
|
---|
| 468 | occured. The time variable is set to the number of
|
---|
| 469 | milliseconds we waited for the message. */
|
---|
| 470 | if (time_needed < next_timeout->time) {
|
---|
| 471 | next_timeout->time -= time_needed;
|
---|
| 472 | } else {
|
---|
| 473 | next_timeout->time = 0;
|
---|
| 474 | }
|
---|
| 475 | }
|
---|
| 476 | }
|
---|
| 477 | }
|
---|
| 478 |
|
---|
| 479 | #endif /* NO_SYS */
|
---|
| 480 |
|
---|
| 481 | #else /* LWIP_TIMERS */
|
---|
| 482 | /* Satisfy the TCP code which calls this function */
|
---|
| 483 | void
|
---|
| 484 | tcp_timer_needed(void)
|
---|
| 485 | {
|
---|
| 486 | }
|
---|
| 487 | #endif /* LWIP_TIMERS */
|
---|