+++ /dev/null
-/**
- * @file
- * Stack-internal timers implementation.
- * This file includes timer callbacks for stack-internal timers as well as
- * functions to set up or stop timers and check for expired timers.
- *
- */
-
-/*
- * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
- * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
- * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
- * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
- * OF SUCH DAMAGE.
- *
- * This file is part of the lwIP TCP/IP stack.
- *
- * Author: Adam Dunkels <adam@sics.se>
- * Simon Goldschmidt
- *
- */
-
-#include "lwip/opt.h"
-
-#include "lwip/timers.h"
-#include "lwip/tcp_impl.h"
-
-#if LWIP_TIMERS
-
-#include "lwip/def.h"
-#include "lwip/memp.h"
-#include "lwip/tcpip.h"
-
-#include "lwip/ip_frag.h"
-#include "netif/etharp.h"
-#include "lwip/dhcp.h"
-#include "lwip/autoip.h"
-#include "lwip/igmp.h"
-#include "lwip/dns.h"
-#include "lwip/sys.h"
-#include "lwip/pbuf.h"
-
-
-/** The one and only timeout list */
-static struct sys_timeo *next_timeout;
-#if NO_SYS
-static u32_t timeouts_last_time;
-#endif /* NO_SYS */
-
-#if LWIP_TCP
-/** global variable that shows if the tcp timer is currently scheduled or not */
-static int tcpip_tcp_timer_active;
-
-/**
- * Timer callback function that calls tcp_tmr() and reschedules itself.
- *
- * @param arg unused argument
- */
-static void
-tcpip_tcp_timer(void *arg)
-{
- LWIP_UNUSED_ARG(arg);
-
- /* call TCP timer handler */
- tcp_tmr();
- /* timer still needed? */
- if (tcp_active_pcbs || tcp_tw_pcbs) {
- /* restart timer */
- sys_timeout(TCP_TMR_INTERVAL, tcpip_tcp_timer, NULL);
- } else {
- /* disable timer */
- tcpip_tcp_timer_active = 0;
- }
-}
-
-/**
- * Called from TCP_REG when registering a new PCB:
- * the reason is to have the TCP timer only running when
- * there are active (or time-wait) PCBs.
- */
-void
-tcp_timer_needed(void)
-{
- /* timer is off but needed again? */
- if (!tcpip_tcp_timer_active && (tcp_active_pcbs || tcp_tw_pcbs)) {
- /* enable and start timer */
- tcpip_tcp_timer_active = 1;
- sys_timeout(TCP_TMR_INTERVAL, tcpip_tcp_timer, NULL);
- }
-}
-#endif /* LWIP_TCP */
-
-#if IP_REASSEMBLY
-/**
- * Timer callback function that calls ip_reass_tmr() and reschedules itself.
- *
- * @param arg unused argument
- */
-static void
-ip_reass_timer(void *arg)
-{
- LWIP_UNUSED_ARG(arg);
- LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: ip_reass_tmr()\n"));
- ip_reass_tmr();
- sys_timeout(IP_TMR_INTERVAL, ip_reass_timer, NULL);
-}
-#endif /* IP_REASSEMBLY */
-
-#if LWIP_ARP
-/**
- * Timer callback function that calls etharp_tmr() and reschedules itself.
- *
- * @param arg unused argument
- */
-static void
-arp_timer(void *arg)
-{
- LWIP_UNUSED_ARG(arg);
- LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: etharp_tmr()\n"));
- etharp_tmr();
- sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
-}
-#endif /* LWIP_ARP */
-
-#if LWIP_DHCP
-/**
- * Timer callback function that calls dhcp_coarse_tmr() and reschedules itself.
- *
- * @param arg unused argument
- */
-static void
-dhcp_timer_coarse(void *arg)
-{
- LWIP_UNUSED_ARG(arg);
- LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: dhcp_coarse_tmr()\n"));
- dhcp_coarse_tmr();
- sys_timeout(DHCP_COARSE_TIMER_MSECS, dhcp_timer_coarse, NULL);
-}
-
-/**
- * Timer callback function that calls dhcp_fine_tmr() and reschedules itself.
- *
- * @param arg unused argument
- */
-static void
-dhcp_timer_fine(void *arg)
-{
- LWIP_UNUSED_ARG(arg);
- LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: dhcp_fine_tmr()\n"));
- dhcp_fine_tmr();
- sys_timeout(DHCP_FINE_TIMER_MSECS, dhcp_timer_fine, NULL);
-}
-#endif /* LWIP_DHCP */
-
-#if LWIP_AUTOIP
-/**
- * Timer callback function that calls autoip_tmr() and reschedules itself.
- *
- * @param arg unused argument
- */
-static void
-autoip_timer(void *arg)
-{
- LWIP_UNUSED_ARG(arg);
- LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: autoip_tmr()\n"));
- autoip_tmr();
- sys_timeout(AUTOIP_TMR_INTERVAL, autoip_timer, NULL);
-}
-#endif /* LWIP_AUTOIP */
-
-#if LWIP_IGMP
-/**
- * Timer callback function that calls igmp_tmr() and reschedules itself.
- *
- * @param arg unused argument
- */
-static void
-igmp_timer(void *arg)
-{
- LWIP_UNUSED_ARG(arg);
- LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: igmp_tmr()\n"));
- igmp_tmr();
- sys_timeout(IGMP_TMR_INTERVAL, igmp_timer, NULL);
-}
-#endif /* LWIP_IGMP */
-
-#if LWIP_DNS
-/**
- * Timer callback function that calls dns_tmr() and reschedules itself.
- *
- * @param arg unused argument
- */
-static void
-dns_timer(void *arg)
-{
- LWIP_UNUSED_ARG(arg);
- LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: dns_tmr()\n"));
- dns_tmr();
- sys_timeout(DNS_TMR_INTERVAL, dns_timer, NULL);
-}
-#endif /* LWIP_DNS */
-
-/** Initialize this module */
-void sys_timeouts_init(void)
-{
-#if IP_REASSEMBLY
- sys_timeout(IP_TMR_INTERVAL, ip_reass_timer, NULL);
-#endif /* IP_REASSEMBLY */
-#if LWIP_ARP
- sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
-#endif /* LWIP_ARP */
-#if LWIP_DHCP
- sys_timeout(DHCP_COARSE_TIMER_MSECS, dhcp_timer_coarse, NULL);
- sys_timeout(DHCP_FINE_TIMER_MSECS, dhcp_timer_fine, NULL);
-#endif /* LWIP_DHCP */
-#if LWIP_AUTOIP
- sys_timeout(AUTOIP_TMR_INTERVAL, autoip_timer, NULL);
-#endif /* LWIP_AUTOIP */
-#if LWIP_IGMP
- sys_timeout(IGMP_TMR_INTERVAL, igmp_timer, NULL);
-#endif /* LWIP_IGMP */
-#if LWIP_DNS
- sys_timeout(DNS_TMR_INTERVAL, dns_timer, NULL);
-#endif /* LWIP_DNS */
-
-#if NO_SYS
- /* Initialise timestamp for sys_check_timeouts */
- timeouts_last_time = sys_now();
-#endif
-}
-
-/**
- * Create a one-shot timer (aka timeout). Timeouts are processed in the
- * following cases:
- * - while waiting for a message using sys_timeouts_mbox_fetch()
- * - by calling sys_check_timeouts() (NO_SYS==1 only)
- *
- * @param msecs time in milliseconds after that the timer should expire
- * @param handler callback function to call when msecs have elapsed
- * @param arg argument to pass to the callback function
- */
-#if LWIP_DEBUG_TIMERNAMES
-void
-sys_timeout_debug(u32_t msecs, sys_timeout_handler handler, void *arg, const char* handler_name)
-#else /* LWIP_DEBUG_TIMERNAMES */
-void
-sys_timeout(u32_t msecs, sys_timeout_handler handler, void *arg)
-#endif /* LWIP_DEBUG_TIMERNAMES */
-{
- struct sys_timeo *timeout, *t;
-
- timeout = (struct sys_timeo *)memp_malloc(MEMP_SYS_TIMEOUT);
- if (timeout == NULL) {
- LWIP_ASSERT("sys_timeout: timeout != NULL, pool MEMP_SYS_TIMEOUT is empty", timeout != NULL);
- return;
- }
- timeout->next = NULL;
- timeout->h = handler;
- timeout->arg = arg;
- timeout->time = msecs;
-#if LWIP_DEBUG_TIMERNAMES
- timeout->handler_name = handler_name;
- LWIP_DEBUGF(TIMERS_DEBUG, ("sys_timeout: %p msecs=%"U32_F" handler=%s arg=%p\n",
- (void *)timeout, msecs, handler_name, (void *)arg));
-#endif /* LWIP_DEBUG_TIMERNAMES */
-
- if (next_timeout == NULL) {
- next_timeout = timeout;
- return;
- }
-
- if (next_timeout->time > msecs) {
- next_timeout->time -= msecs;
- timeout->next = next_timeout;
- next_timeout = timeout;
- } else {
- for(t = next_timeout; t != NULL; t = t->next) {
- timeout->time -= t->time;
- if (t->next == NULL || t->next->time > timeout->time) {
- if (t->next != NULL) {
- t->next->time -= timeout->time;
- }
- timeout->next = t->next;
- t->next = timeout;
- break;
- }
- }
- }
-}
-
-/**
- * Go through timeout list (for this task only) and remove the first matching
- * entry, even though the timeout has not triggered yet.
- *
- * @note This function only works as expected if there is only one timeout
- * calling 'handler' in the list of timeouts.
- *
- * @param handler callback function that would be called by the timeout
- * @param arg callback argument that would be passed to handler
-*/
-void
-sys_untimeout(sys_timeout_handler handler, void *arg)
-{
- struct sys_timeo *prev_t, *t;
-
- if (next_timeout == NULL) {
- return;
- }
-
- for (t = next_timeout, prev_t = NULL; t != NULL; prev_t = t, t = t->next) {
- if ((t->h == handler) && (t->arg == arg)) {
- /* We have a match */
- /* Unlink from previous in list */
- if (prev_t == NULL) {
- next_timeout = t->next;
- } else {
- prev_t->next = t->next;
- }
- /* If not the last one, add time of this one back to next */
- if (t->next != NULL) {
- t->next->time += t->time;
- }
- memp_free(MEMP_SYS_TIMEOUT, t);
- return;
- }
- }
- return;
-}
-
-#if NO_SYS
-
-/** Handle timeouts for NO_SYS==1 (i.e. without using
- * tcpip_thread/sys_timeouts_mbox_fetch(). Uses sys_now() to call timeout
- * handler functions when timeouts expire.
- *
- * Must be called periodically from your main loop.
- */
-void
-sys_check_timeouts(void)
-{
- if (next_timeout) {
- struct sys_timeo *tmptimeout;
- u32_t diff;
- sys_timeout_handler handler;
- void *arg;
- u8_t had_one;
- u32_t now;
-
- now = sys_now();
- /* this cares for wraparounds */
- diff = now - timeouts_last_time;
- do
- {
-#if PBUF_POOL_FREE_OOSEQ
- PBUF_CHECK_FREE_OOSEQ();
-#endif /* PBUF_POOL_FREE_OOSEQ */
- had_one = 0;
- tmptimeout = next_timeout;
- if (tmptimeout && (tmptimeout->time <= diff)) {
- /* timeout has expired */
- had_one = 1;
- timeouts_last_time = now;
- diff -= tmptimeout->time;
- next_timeout = tmptimeout->next;
- handler = tmptimeout->h;
- arg = tmptimeout->arg;
-#if LWIP_DEBUG_TIMERNAMES
- if (handler != NULL) {
- LWIP_DEBUGF(TIMERS_DEBUG, ("sct calling h=%s arg=%p\n",
- tmptimeout->handler_name, arg));
- }
-#endif /* LWIP_DEBUG_TIMERNAMES */
- memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
- if (handler != NULL) {
- handler(arg);
- }
- }
- /* repeat until all expired timers have been called */
- }while(had_one);
- }
-}
-
-/** Set back the timestamp of the last call to sys_check_timeouts()
- * This is necessary if sys_check_timeouts() hasn't been called for a long
- * time (e.g. while saving energy) to prevent all timer functions of that
- * period being called.
- */
-void
-sys_restart_timeouts(void)
-{
- timeouts_last_time = sys_now();
-}
-
-#else /* NO_SYS */
-
-/**
- * Wait (forever) for a message to arrive in an mbox.
- * While waiting, timeouts are processed.
- *
- * @param mbox the mbox to fetch the message from
- * @param msg the place to store the message
- */
-void
-sys_timeouts_mbox_fetch(sys_mbox_t *mbox, void **msg)
-{
- u32_t time_needed;
- struct sys_timeo *tmptimeout;
- sys_timeout_handler handler;
- void *arg;
-
- again:
- if (!next_timeout) {
- time_needed = sys_arch_mbox_fetch(mbox, msg, 0);
- } else {
- if (next_timeout->time > 0) {
- time_needed = sys_arch_mbox_fetch(mbox, msg, next_timeout->time);
- } else {
- time_needed = SYS_ARCH_TIMEOUT;
- }
-
- if (time_needed == SYS_ARCH_TIMEOUT) {
- /* If time == SYS_ARCH_TIMEOUT, a timeout occured before a message
- could be fetched. We should now call the timeout handler and
- deallocate the memory allocated for the timeout. */
- tmptimeout = next_timeout;
- next_timeout = tmptimeout->next;
- handler = tmptimeout->h;
- arg = tmptimeout->arg;
-#if LWIP_DEBUG_TIMERNAMES
- if (handler != NULL) {
- LWIP_DEBUGF(TIMERS_DEBUG, ("stmf calling h=%s arg=%p\n",
- tmptimeout->handler_name, arg));
- }
-#endif /* LWIP_DEBUG_TIMERNAMES */
- memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
- if (handler != NULL) {
- /* For LWIP_TCPIP_CORE_LOCKING, lock the core before calling the
- timeout handler function. */
- LOCK_TCPIP_CORE();
- handler(arg);
- UNLOCK_TCPIP_CORE();
- }
- LWIP_TCPIP_THREAD_ALIVE();
-
- /* We try again to fetch a message from the mbox. */
- goto again;
- } else {
- /* If time != SYS_ARCH_TIMEOUT, a message was received before the timeout
- occured. The time variable is set to the number of
- milliseconds we waited for the message. */
- if (time_needed < next_timeout->time) {
- next_timeout->time -= time_needed;
- } else {
- next_timeout->time = 0;
- }
- }
- }
-}
-
-#endif /* NO_SYS */
-
-#else /* LWIP_TIMERS */
-/* Satisfy the TCP code which calls this function */
-void
-tcp_timer_needed(void)
-{
-}
-#endif /* LWIP_TIMERS */
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