[457] | 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/timeouts.h"
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| 45 | #include "lwip/priv/tcp_priv.h"
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| 46 |
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| 47 | #include "lwip/def.h"
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| 48 | #include "lwip/memp.h"
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| 49 | #include "lwip/priv/tcpip_priv.h"
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| 50 |
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| 51 | #include "lwip/ip4_frag.h"
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| 52 | #include "lwip/etharp.h"
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| 53 | #include "lwip/dhcp.h"
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| 54 | #include "lwip/autoip.h"
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| 55 | #include "lwip/igmp.h"
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| 56 | #include "lwip/dns.h"
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| 57 | #include "lwip/nd6.h"
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| 58 | #include "lwip/ip6_frag.h"
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| 59 | #include "lwip/mld6.h"
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| 60 | #include "lwip/dhcp6.h"
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| 61 | #include "lwip/sys.h"
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| 62 | #include "lwip/pbuf.h"
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| 63 |
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| 64 | #if LWIP_DEBUG_TIMERNAMES
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| 65 | #define HANDLER(x) x, #x
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| 66 | #else /* LWIP_DEBUG_TIMERNAMES */
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| 67 | #define HANDLER(x) x
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| 68 | #endif /* LWIP_DEBUG_TIMERNAMES */
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| 69 |
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| 70 | #define LWIP_MAX_TIMEOUT 0x7fffffff
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| 71 |
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| 72 | /* Check if timer's expiry time is greater than time and care about u32_t wraparounds */
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| 73 | #define TIME_LESS_THAN(t, compare_to) ( (((u32_t)((t)-(compare_to))) > LWIP_MAX_TIMEOUT) ? 1 : 0 )
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| 74 |
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| 75 | /** This array contains all stack-internal cyclic timers. To get the number of
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| 76 | * timers, use LWIP_ARRAYSIZE() */
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| 77 | const struct lwip_cyclic_timer lwip_cyclic_timers[] = {
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| 78 | #if LWIP_TCP
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| 79 | /* The TCP timer is a special case: it does not have to run always and
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| 80 | is triggered to start from TCP using tcp_timer_needed() */
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| 81 | {TCP_TMR_INTERVAL, HANDLER(tcp_tmr)},
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| 82 | #endif /* LWIP_TCP */
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| 83 | #if LWIP_IPV4
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| 84 | #if IP_REASSEMBLY
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| 85 | {IP_TMR_INTERVAL, HANDLER(ip_reass_tmr)},
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| 86 | #endif /* IP_REASSEMBLY */
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| 87 | #if LWIP_ARP
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| 88 | {ARP_TMR_INTERVAL, HANDLER(etharp_tmr)},
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| 89 | #endif /* LWIP_ARP */
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| 90 | #if LWIP_DHCP
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| 91 | {DHCP_COARSE_TIMER_MSECS, HANDLER(dhcp_coarse_tmr)},
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| 92 | {DHCP_FINE_TIMER_MSECS, HANDLER(dhcp_fine_tmr)},
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| 93 | #endif /* LWIP_DHCP */
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| 94 | #if LWIP_AUTOIP
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| 95 | {AUTOIP_TMR_INTERVAL, HANDLER(autoip_tmr)},
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| 96 | #endif /* LWIP_AUTOIP */
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| 97 | #if LWIP_IGMP
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| 98 | {IGMP_TMR_INTERVAL, HANDLER(igmp_tmr)},
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| 99 | #endif /* LWIP_IGMP */
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| 100 | #endif /* LWIP_IPV4 */
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| 101 | #if LWIP_DNS
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| 102 | {DNS_TMR_INTERVAL, HANDLER(dns_tmr)},
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| 103 | #endif /* LWIP_DNS */
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| 104 | #if LWIP_IPV6
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| 105 | {ND6_TMR_INTERVAL, HANDLER(nd6_tmr)},
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| 106 | #if LWIP_IPV6_REASS
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| 107 | {IP6_REASS_TMR_INTERVAL, HANDLER(ip6_reass_tmr)},
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| 108 | #endif /* LWIP_IPV6_REASS */
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| 109 | #if LWIP_IPV6_MLD
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| 110 | {MLD6_TMR_INTERVAL, HANDLER(mld6_tmr)},
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| 111 | #endif /* LWIP_IPV6_MLD */
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| 112 | #if LWIP_IPV6_DHCP6
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| 113 | {DHCP6_TIMER_MSECS, HANDLER(dhcp6_tmr)},
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| 114 | #endif /* LWIP_IPV6_DHCP6 */
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| 115 | #endif /* LWIP_IPV6 */
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| 116 | };
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| 117 | const int lwip_num_cyclic_timers = LWIP_ARRAYSIZE(lwip_cyclic_timers);
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| 118 |
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| 119 | #if LWIP_TIMERS && !LWIP_TIMERS_CUSTOM
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| 120 |
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| 121 | /** The one and only timeout list */
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| 122 | static struct sys_timeo *next_timeout;
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| 123 |
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| 124 | static u32_t current_timeout_due_time;
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| 125 |
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| 126 | #if LWIP_TESTMODE
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| 127 | struct sys_timeo**
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| 128 | sys_timeouts_get_next_timeout(void)
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| 129 | {
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| 130 | return &next_timeout;
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| 131 | }
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| 132 | #endif
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| 133 |
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| 134 | #if LWIP_TCP
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| 135 | /** global variable that shows if the tcp timer is currently scheduled or not */
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| 136 | static int tcpip_tcp_timer_active;
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| 137 |
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| 138 | /**
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| 139 | * Timer callback function that calls tcp_tmr() and reschedules itself.
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| 140 | *
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| 141 | * @param arg unused argument
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| 142 | */
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| 143 | static void
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| 144 | tcpip_tcp_timer(void *arg)
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| 145 | {
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| 146 | LWIP_UNUSED_ARG(arg);
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| 147 |
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| 148 | /* call TCP timer handler */
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| 149 | tcp_tmr();
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| 150 | /* timer still needed? */
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| 151 | if (tcp_active_pcbs || tcp_tw_pcbs) {
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| 152 | /* restart timer */
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| 153 | sys_timeout(TCP_TMR_INTERVAL, tcpip_tcp_timer, NULL);
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| 154 | } else {
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| 155 | /* disable timer */
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| 156 | tcpip_tcp_timer_active = 0;
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| 157 | }
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| 158 | }
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| 159 |
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| 160 | /**
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| 161 | * Called from TCP_REG when registering a new PCB:
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| 162 | * the reason is to have the TCP timer only running when
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| 163 | * there are active (or time-wait) PCBs.
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| 164 | */
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| 165 | void
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| 166 | tcp_timer_needed(void)
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| 167 | {
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| 168 | LWIP_ASSERT_CORE_LOCKED();
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| 169 |
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| 170 | /* timer is off but needed again? */
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| 171 | if (!tcpip_tcp_timer_active && (tcp_active_pcbs || tcp_tw_pcbs)) {
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| 172 | /* enable and start timer */
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| 173 | tcpip_tcp_timer_active = 1;
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| 174 | sys_timeout(TCP_TMR_INTERVAL, tcpip_tcp_timer, NULL);
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| 175 | }
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| 176 | }
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| 177 | #endif /* LWIP_TCP */
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| 178 |
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| 179 | static void
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| 180 | #if LWIP_DEBUG_TIMERNAMES
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| 181 | sys_timeout_abs(u32_t abs_time, sys_timeout_handler handler, void *arg, const char *handler_name)
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| 182 | #else /* LWIP_DEBUG_TIMERNAMES */
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| 183 | sys_timeout_abs(u32_t abs_time, sys_timeout_handler handler, void *arg)
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| 184 | #endif
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| 185 | {
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| 186 | struct sys_timeo *timeout, *t;
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| 187 |
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| 188 | timeout = (struct sys_timeo *)memp_malloc(MEMP_SYS_TIMEOUT);
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| 189 | if (timeout == NULL) {
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| 190 | LWIP_ASSERT("sys_timeout: timeout != NULL, pool MEMP_SYS_TIMEOUT is empty", timeout != NULL);
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| 191 | return;
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| 192 | }
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| 193 |
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| 194 | timeout->next = NULL;
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| 195 | timeout->h = handler;
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| 196 | timeout->arg = arg;
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| 197 | timeout->time = abs_time;
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| 198 |
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| 199 | #if LWIP_DEBUG_TIMERNAMES
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| 200 | timeout->handler_name = handler_name;
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| 201 | LWIP_DEBUGF(TIMERS_DEBUG, ("sys_timeout: %p abs_time=%"U32_F" handler=%s arg=%p\n",
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| 202 | (void *)timeout, abs_time, handler_name, (void *)arg));
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| 203 | #endif /* LWIP_DEBUG_TIMERNAMES */
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| 204 |
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| 205 | if (next_timeout == NULL) {
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| 206 | next_timeout = timeout;
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| 207 | return;
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| 208 | }
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| 209 | if (TIME_LESS_THAN(timeout->time, next_timeout->time)) {
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| 210 | timeout->next = next_timeout;
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| 211 | next_timeout = timeout;
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| 212 | } else {
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| 213 | for (t = next_timeout; t != NULL; t = t->next) {
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| 214 | if ((t->next == NULL) || TIME_LESS_THAN(timeout->time, t->next->time)) {
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| 215 | timeout->next = t->next;
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| 216 | t->next = timeout;
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| 217 | break;
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| 218 | }
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| 219 | }
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| 220 | }
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| 221 | }
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| 222 |
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| 223 | /**
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| 224 | * Timer callback function that calls cyclic->handler() and reschedules itself.
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| 225 | *
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| 226 | * @param arg unused argument
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| 227 | */
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| 228 | #if !LWIP_TESTMODE
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| 229 | static
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| 230 | #endif
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| 231 | void
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| 232 | lwip_cyclic_timer(void *arg)
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| 233 | {
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| 234 | u32_t now;
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| 235 | u32_t next_timeout_time;
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| 236 | const struct lwip_cyclic_timer *cyclic = (const struct lwip_cyclic_timer *)arg;
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| 237 |
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| 238 | #if LWIP_DEBUG_TIMERNAMES
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| 239 | LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: %s()\n", cyclic->handler_name));
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| 240 | #endif
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| 241 | cyclic->handler();
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| 242 |
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| 243 | now = sys_now();
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| 244 | next_timeout_time = (u32_t)(current_timeout_due_time + cyclic->interval_ms); /* overflow handled by TIME_LESS_THAN macro */
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| 245 | if (TIME_LESS_THAN(next_timeout_time, now)) {
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| 246 | /* timer would immediately expire again -> "overload" -> restart without any correction */
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| 247 | #if LWIP_DEBUG_TIMERNAMES
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| 248 | sys_timeout_abs((u32_t)(now + cyclic->interval_ms), lwip_cyclic_timer, arg, cyclic->handler_name);
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| 249 | #else
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| 250 | sys_timeout_abs((u32_t)(now + cyclic->interval_ms), lwip_cyclic_timer, arg);
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| 251 | #endif
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| 252 |
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| 253 | } else {
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| 254 | /* correct cyclic interval with handler execution delay and sys_check_timeouts jitter */
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| 255 | #if LWIP_DEBUG_TIMERNAMES
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| 256 | sys_timeout_abs(next_timeout_time, lwip_cyclic_timer, arg, cyclic->handler_name);
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| 257 | #else
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| 258 | sys_timeout_abs(next_timeout_time, lwip_cyclic_timer, arg);
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| 259 | #endif
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| 260 | }
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| 261 | }
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| 262 |
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| 263 | /** Initialize this module */
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| 264 | void sys_timeouts_init(void)
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| 265 | {
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| 266 | size_t i;
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| 267 | /* tcp_tmr() at index 0 is started on demand */
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| 268 | for (i = (LWIP_TCP ? 1 : 0); i < LWIP_ARRAYSIZE(lwip_cyclic_timers); i++) {
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| 269 | /* we have to cast via size_t to get rid of const warning
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| 270 | (this is OK as cyclic_timer() casts back to const* */
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| 271 | sys_timeout(lwip_cyclic_timers[i].interval_ms, lwip_cyclic_timer, LWIP_CONST_CAST(void *, &lwip_cyclic_timers[i]));
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| 272 | }
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| 273 | }
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| 274 |
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| 275 | /**
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| 276 | * Create a one-shot timer (aka timeout). Timeouts are processed in the
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| 277 | * following cases:
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| 278 | * - while waiting for a message using sys_timeouts_mbox_fetch()
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| 279 | * - by calling sys_check_timeouts() (NO_SYS==1 only)
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| 280 | *
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| 281 | * @param msecs time in milliseconds after that the timer should expire
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| 282 | * @param handler callback function to call when msecs have elapsed
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| 283 | * @param arg argument to pass to the callback function
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| 284 | */
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| 285 | #if LWIP_DEBUG_TIMERNAMES
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| 286 | void
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| 287 | sys_timeout_debug(u32_t msecs, sys_timeout_handler handler, void *arg, const char *handler_name)
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| 288 | #else /* LWIP_DEBUG_TIMERNAMES */
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| 289 | void
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| 290 | sys_timeout(u32_t msecs, sys_timeout_handler handler, void *arg)
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| 291 | #endif /* LWIP_DEBUG_TIMERNAMES */
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| 292 | {
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| 293 | u32_t next_timeout_time;
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| 294 |
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| 295 | LWIP_ASSERT_CORE_LOCKED();
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| 296 |
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| 297 | LWIP_ASSERT("Timeout time too long, max is LWIP_UINT32_MAX/4 msecs", msecs <= (LWIP_UINT32_MAX / 4));
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| 298 |
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| 299 | next_timeout_time = (u32_t)(sys_now() + msecs); /* overflow handled by TIME_LESS_THAN macro */
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| 300 |
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| 301 | #if LWIP_DEBUG_TIMERNAMES
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| 302 | sys_timeout_abs(next_timeout_time, handler, arg, handler_name);
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| 303 | #else
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| 304 | sys_timeout_abs(next_timeout_time, handler, arg);
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| 305 | #endif
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| 306 | }
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| 307 |
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| 308 | /**
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| 309 | * Go through timeout list (for this task only) and remove the first matching
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| 310 | * entry (subsequent entries remain untouched), even though the timeout has not
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| 311 | * triggered yet.
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| 312 | *
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| 313 | * @param handler callback function that would be called by the timeout
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| 314 | * @param arg callback argument that would be passed to handler
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| 315 | */
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| 316 | void
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| 317 | sys_untimeout(sys_timeout_handler handler, void *arg)
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| 318 | {
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| 319 | struct sys_timeo *prev_t, *t;
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| 320 |
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| 321 | LWIP_ASSERT_CORE_LOCKED();
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| 322 |
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| 323 | if (next_timeout == NULL) {
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| 324 | return;
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| 325 | }
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| 326 |
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| 327 | for (t = next_timeout, prev_t = NULL; t != NULL; prev_t = t, t = t->next) {
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| 328 | if ((t->h == handler) && (t->arg == arg)) {
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| 329 | /* We have a match */
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| 330 | /* Unlink from previous in list */
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| 331 | if (prev_t == NULL) {
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| 332 | next_timeout = t->next;
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| 333 | } else {
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| 334 | prev_t->next = t->next;
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| 335 | }
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| 336 | memp_free(MEMP_SYS_TIMEOUT, t);
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| 337 | return;
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| 338 | }
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| 339 | }
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| 340 | return;
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| 341 | }
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| 342 |
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| 343 | /**
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| 344 | * @ingroup lwip_nosys
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| 345 | * Handle timeouts for NO_SYS==1 (i.e. without using
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| 346 | * tcpip_thread/sys_timeouts_mbox_fetch(). Uses sys_now() to call timeout
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| 347 | * handler functions when timeouts expire.
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| 348 | *
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| 349 | * Must be called periodically from your main loop.
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| 350 | */
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| 351 | void
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| 352 | sys_check_timeouts(void)
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| 353 | {
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| 354 | u32_t now;
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| 355 |
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| 356 | LWIP_ASSERT_CORE_LOCKED();
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| 357 |
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| 358 | /* Process only timers expired at the start of the function. */
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| 359 | now = sys_now();
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| 360 |
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| 361 | do {
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| 362 | struct sys_timeo *tmptimeout;
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| 363 | sys_timeout_handler handler;
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| 364 | void *arg;
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| 365 |
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| 366 | PBUF_CHECK_FREE_OOSEQ();
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| 367 |
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| 368 | tmptimeout = next_timeout;
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| 369 | if (tmptimeout == NULL) {
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| 370 | return;
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| 371 | }
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| 372 |
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| 373 | if (TIME_LESS_THAN(now, tmptimeout->time)) {
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| 374 | return;
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| 375 | }
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| 376 |
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| 377 | /* Timeout has expired */
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| 378 | next_timeout = tmptimeout->next;
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| 379 | handler = tmptimeout->h;
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| 380 | arg = tmptimeout->arg;
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| 381 | current_timeout_due_time = tmptimeout->time;
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| 382 | #if LWIP_DEBUG_TIMERNAMES
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| 383 | if (handler != NULL) {
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| 384 | LWIP_DEBUGF(TIMERS_DEBUG, ("sct calling h=%s t=%"U32_F" arg=%p\n",
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| 385 | tmptimeout->handler_name, sys_now() - tmptimeout->time, arg));
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| 386 | }
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| 387 | #endif /* LWIP_DEBUG_TIMERNAMES */
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| 388 | memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
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| 389 | if (handler != NULL) {
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| 390 | handler(arg);
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| 391 | }
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| 392 | LWIP_TCPIP_THREAD_ALIVE();
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| 393 |
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| 394 | /* Repeat until all expired timers have been called */
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| 395 | } while (1);
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| 396 | }
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| 397 |
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| 398 | /** Rebase the timeout times to the current time.
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| 399 | * This is necessary if sys_check_timeouts() hasn't been called for a long
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| 400 | * time (e.g. while saving energy) to prevent all timer functions of that
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| 401 | * period being called.
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| 402 | */
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| 403 | void
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| 404 | sys_restart_timeouts(void)
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| 405 | {
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| 406 | u32_t now;
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| 407 | u32_t base;
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| 408 | struct sys_timeo *t;
|
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| 409 |
|
---|
| 410 | if (next_timeout == NULL) {
|
---|
| 411 | return;
|
---|
| 412 | }
|
---|
| 413 |
|
---|
| 414 | now = sys_now();
|
---|
| 415 | base = next_timeout->time;
|
---|
| 416 |
|
---|
| 417 | for (t = next_timeout; t != NULL; t = t->next) {
|
---|
| 418 | t->time = (t->time - base) + now;
|
---|
| 419 | }
|
---|
| 420 | }
|
---|
| 421 |
|
---|
| 422 | /** Return the time left before the next timeout is due. If no timeouts are
|
---|
| 423 | * enqueued, returns 0xffffffff
|
---|
| 424 | */
|
---|
| 425 | u32_t
|
---|
| 426 | sys_timeouts_sleeptime(void)
|
---|
| 427 | {
|
---|
| 428 | u32_t now;
|
---|
| 429 |
|
---|
| 430 | LWIP_ASSERT_CORE_LOCKED();
|
---|
| 431 |
|
---|
| 432 | if (next_timeout == NULL) {
|
---|
| 433 | return SYS_TIMEOUTS_SLEEPTIME_INFINITE;
|
---|
| 434 | }
|
---|
| 435 | now = sys_now();
|
---|
| 436 | if (TIME_LESS_THAN(next_timeout->time, now)) {
|
---|
| 437 | return 0;
|
---|
| 438 | } else {
|
---|
| 439 | u32_t ret = (u32_t)(next_timeout->time - now);
|
---|
| 440 | LWIP_ASSERT("invalid sleeptime", ret <= LWIP_MAX_TIMEOUT);
|
---|
| 441 | return ret;
|
---|
| 442 | }
|
---|
| 443 | }
|
---|
| 444 |
|
---|
| 445 | #else /* LWIP_TIMERS && !LWIP_TIMERS_CUSTOM */
|
---|
| 446 | /* Satisfy the TCP code which calls this function */
|
---|
| 447 | void
|
---|
| 448 | tcp_timer_needed(void)
|
---|
| 449 | {
|
---|
| 450 | }
|
---|
| 451 | #endif /* LWIP_TIMERS && !LWIP_TIMERS_CUSTOM */
|
---|