lwip/lwip-1.4.1-dev/src/core/timers.c File Reference

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.

#include "lwip/opt.h"
#include "lwip/timers.h"
#include "lwip/tcp_impl.h"
#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/nd6.h"
#include "lwip/ip6_frag.h"
#include "lwip/mld6.h"
#include "lwip/sys.h"
#include "lwip/pbuf.h"

Functions
static void	arp_timer (void *arg)
	Timer callback function that calls etharp_tmr() and reschedules itself. More...
static void	autoip_timer (void *arg)
	Timer callback function that calls autoip_tmr() and reschedules itself. More...
static void	dhcp_timer_coarse (void *arg)
	Timer callback function that calls dhcp_coarse_tmr() and reschedules itself. More...
static void	dhcp_timer_fine (void *arg)
	Timer callback function that calls dhcp_fine_tmr() and reschedules itself. More...
static void	dns_timer (void *arg)
	Timer callback function that calls dns_tmr() and reschedules itself. More...
	if (timeout==NULL)
	if (next_timeout==NULL)
	if (next_timeout->time > msecs)
static void	ip6_reass_timer (void *arg)
	Timer callback function that calls ip6_reass_tmr() and reschedules itself. More...
static void	ip_reass_timer (void *arg)
	Timer callback function that calls ip_reass_tmr() and reschedules itself. More...
static void	mld6_timer (void *arg)
	Timer callback function that calls mld6_tmr() and reschedules itself. More...
static void	nd6_timer (void *arg)
	Timer callback function that calls nd6_tmr() and reschedules itself. More...
void	sys_timeouts_init (void)
	Initialize this module. More...
void	tcp_timer_needed (void)
	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. More...
static void	tcpip_tcp_timer (void *arg)
	Timer callback function that calls tcp_tmr() and reschedules itself. More...

Variables
timeout	arg = arg
timeout	h = handler
timeout	next = NULL
static struct sys_timeo *	next_timeout
	The one and only timeout list. More...
static int	tcpip_tcp_timer_active
	global variable that shows if the tcp timer is currently scheduled or not More...
timeout	time = msecs
	timeout = (struct sys_timeo *)memp_malloc(MEMP_SYS_TIMEOUT)
	void
	Create a one-shot timer (aka timeout). More...

static void arp_timer ( void *  arg )

static

Timer callback function that calls etharp_tmr() and reschedules itself.

Parameters

arg	unused argument

References ARP_TMR_INTERVAL, etharp_tmr(), LWIP_DEBUGF, NULL, sys_timeout(), and TIMERS_DEBUG.

Referenced by sys_timeouts_init().

static void autoip_timer ( void *  arg )

static

Timer callback function that calls autoip_tmr() and reschedules itself.

Parameters

arg	unused argument

References autoip_tmr(), AUTOIP_TMR_INTERVAL, LWIP_DEBUGF, NULL, sys_timeout(), and TIMERS_DEBUG.

Referenced by sys_timeouts_init().

static void dhcp_timer_coarse ( void *  arg )

static

Timer callback function that calls dhcp_coarse_tmr() and reschedules itself.

Parameters

arg	unused argument

References DHCP_COARSE_TIMER_MSECS, dhcp_coarse_tmr(), LWIP_DEBUGF, NULL, sys_timeout(), and TIMERS_DEBUG.

Referenced by sys_timeouts_init().

static void dhcp_timer_fine ( void *  arg )

static

Timer callback function that calls dhcp_fine_tmr() and reschedules itself.

Parameters

arg	unused argument

References DHCP_FINE_TIMER_MSECS, dhcp_fine_tmr(), LWIP_DEBUGF, NULL, sys_timeout(), and TIMERS_DEBUG.

Referenced by sys_timeouts_init().

static void dns_timer ( void *  arg )

static

Timer callback function that calls dns_tmr() and reschedules itself.

Parameters

arg	unused argument

References dns_tmr(), DNS_TMR_INTERVAL, LWIP_DEBUGF, NULL, sys_timeout(), and TIMERS_DEBUG.

Referenced by sys_timeouts_init().

if

(

timeout

= = NULL

)

References LWIP_ASSERT, and NULL.

if

(

next_timeout

= = NULL

)

References timeout.

if	(	next_timeout->	time,
		msecs
	)

References sys_timeo::next, next_timeout, sys_timeo::time, and timeout.

static void ip6_reass_timer ( void *  arg )

static

Timer callback function that calls ip6_reass_tmr() and reschedules itself.

Parameters

arg	unused argument

References ip6_reass_tmr(), IP6_REASS_TMR_INTERVAL, LWIP_DEBUGF, NULL, sys_timeout(), and TIMERS_DEBUG.

Referenced by sys_timeouts_init().

static void ip_reass_timer ( void *  arg )

static

Timer callback function that calls ip_reass_tmr() and reschedules itself.

Parameters

arg	unused argument

References ip_reass_tmr(), IP_TMR_INTERVAL, LWIP_DEBUGF, NULL, sys_timeout(), and TIMERS_DEBUG.

Referenced by sys_timeouts_init().

static void mld6_timer ( void *  arg )

static

Timer callback function that calls mld6_tmr() and reschedules itself.

Parameters

arg	unused argument

References LWIP_DEBUGF, mld6_tmr(), MLD6_TMR_INTERVAL, NULL, sys_timeout(), and TIMERS_DEBUG.

Referenced by sys_timeouts_init().

static void nd6_timer ( void *  arg )

static

Timer callback function that calls nd6_tmr() and reschedules itself.

Parameters

arg	unused argument

References LWIP_DEBUGF, nd6_tmr(), ND6_TMR_INTERVAL, NULL, sys_timeout(), and TIMERS_DEBUG.

Referenced by sys_timeouts_init().

void sys_timeouts_init

(

void

)

Initialize this module.

References arp_timer(), ARP_TMR_INTERVAL, autoip_timer(), AUTOIP_TMR_INTERVAL, DHCP_COARSE_TIMER_MSECS, DHCP_FINE_TIMER_MSECS, dhcp_timer_coarse(), dhcp_timer_fine(), dns_timer(), DNS_TMR_INTERVAL, ip6_reass_timer(), IP6_REASS_TMR_INTERVAL, ip_reass_timer(), IP_TMR_INTERVAL, mld6_timer(), MLD6_TMR_INTERVAL, nd6_timer(), ND6_TMR_INTERVAL, NULL, sys_now(), and sys_timeout().

Referenced by lwip_init().

void tcp_timer_needed

(

void

)

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.

External function (implemented in timers.c), called when TCP detects that a timer is needed (i.e.

References NULL, sys_timeout(), tcp_active_pcbs, TCP_TMR_INTERVAL, tcp_tw_pcbs, tcpip_tcp_timer(), and tcpip_tcp_timer_active.

static void tcpip_tcp_timer ( void *  arg )

static

Timer callback function that calls tcp_tmr() and reschedules itself.

Parameters

arg	unused argument

References NULL, sys_timeout(), tcp_active_pcbs, tcp_tmr(), TCP_TMR_INTERVAL, tcp_tw_pcbs, and tcpip_tcp_timer_active.

Referenced by tcp_timer_needed().

timeout arg = arg

Referenced by dns_call_found(), hsmci_send_cmd_execute(), mmc_cmd6_set_bus_width(), sd_mci_op_cond(), sd_mmc_init_read_blocks(), sd_mmc_init_write_blocks(), sd_spi_op_cond(), tcp_arg(), tcpip_init(), tcpip_timeout(), and tcpip_untimeout().

timeout h = handler

Referenced by tcpip_timeout(), and tcpip_untimeout().

timeout next = NULL

Referenced by mld6_stop(), netif_set_ipaddr(), tcp_fasttmr(), tcp_oos_insert_segment(), tcp_receive(), and tcp_segs_free().

struct sys_timeo* next_timeout

static

The one and only timeout list.

Referenced by if().

int tcpip_tcp_timer_active

static

global variable that shows if the tcp timer is currently scheduled or not

Referenced by tcp_timer_needed(), and tcpip_tcp_timer().

timeout time = msecs

Referenced by nd6_new_neighbor_cache_entry().

timeout = (struct sys_timeo *)memp_malloc(MEMP_SYS_TIMEOUT)

Referenced by chip_deinit(), dhcp_bind(), if(), spi_read(), spi_write(), and usart_set_rx_timeout().

void

Initial value:

{
  struct sys_timeo *timeout, *t

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)

Parameters

msecs	time in milliseconds after that the timer should expire
handler	callback function to call when msecs have elapsed
arg	argument to pass to the callback function

Referenced by nd6_select_router(), netif_null_output_ip6(), pmc_enable_waitmode(), portTASK_FUNCTION(), prvHelpCommand(), prvInitialiseTCBVariables(), prvProcessExpiredTimer(), prvProcessReceivedCommands(), prvSwitchTimerLists(), prvTimerTask(), stdio_serial_init(), vTaskPrioritySet(), xQueueCreateMutex(), xQueueGenericCreate(), xQueueGenericReceive(), and xQueueGenericSend().