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) {
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435 | time_needed = sys_arch_mbox_fetch(mbox, msg, next_timeout->time);
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436 | } else {
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437 | time_needed = SYS_ARCH_TIMEOUT;
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438 | }
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439 |
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440 | if (time_needed == SYS_ARCH_TIMEOUT) {
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441 | /* If time == SYS_ARCH_TIMEOUT, a timeout occured before a message
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442 | could be fetched. We should now call the timeout handler and
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443 | deallocate the memory allocated for the timeout. */
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444 | tmptimeout = next_timeout;
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445 | next_timeout = tmptimeout->next;
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446 | handler = tmptimeout->h;
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447 | arg = tmptimeout->arg;
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448 | #if LWIP_DEBUG_TIMERNAMES
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449 | if (handler != NULL) {
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450 | LWIP_DEBUGF(TIMERS_DEBUG, ("stmf calling h=%s arg=%p\n",
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451 | tmptimeout->handler_name, arg));
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452 | }
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---|
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 */
|
---|