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timeouts.h File Reference
`#include "lwip/opt.h"`
`#include "lwip/err.h"`
`#include "lwip/sys.h"`

## Data Structures

struct | lwip_cyclic_timer

## Macros

#define | SYS_TIMEOUTS_SLEEPTIME_INFINITE 0xFFFFFFFF

## Typedefs

typedef void(* | lwip_cyclic_timer_handler) (void)
typedef void(* | sys_timeout_handler) (void *arg)

## Functions

void | sys_timeouts_init (void)
void | sys_timeout (u32_t msecs, sys_timeout_handler handler, void *arg)
void | sys_untimeout (sys_timeout_handler handler, void *arg)
void | sys_restart_timeouts (void)
void | sys_check_timeouts (void)
u32_t | sys_timeouts_sleeptime (void)

## Variables

const struct lwip_cyclic_timer | lwip_cyclic_timers []
const int | lwip_num_cyclic_timers

## Detailed Description

Timer implementations

## Macro Definition Documentation

## SYS_TIMEOUTS_SLEEPTIME_INFINITE

#define SYS_TIMEOUTS_SLEEPTIME_INFINITE 0xFFFFFFFF

Returned by sys_timeouts_sleeptime() to indicate there is no timer, so we can sleep forever.

## Typedef Documentation

## lwip_cyclic_timer_handler

typedef void(* lwip_cyclic_timer_handler) (void)

Function prototype for a stack-internal timer function that has to be called at a defined interval

## sys_timeout_handler

typedef void(* sys_timeout_handler) (void *arg)

Function prototype for a timeout callback function. Register such a function using sys_timeout().

Parameters

  arg | Additional argument to pass to the function - set up by sys_timeout()

## Function Documentation

## sys_restart_timeouts()

void sys_restart_timeouts | ( | void |  | ) |

Rebase the timeout times to the current time. 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.

## sys_timeout()

void sys_timeout | ( | u32_t | msecs,
|  | sys_timeout_handler | handler,
|  | void * | arg )

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

## sys_timeouts_init()

void sys_timeouts_init | ( | void |  | ) |

Initialize this module

## sys_timeouts_sleeptime()

u32_t sys_timeouts_sleeptime | ( | void |  | ) |

Return the time left before the next timeout is due. If no timeouts are enqueued, returns 0xffffffff

## sys_untimeout()

void sys_untimeout | ( | sys_timeout_handler | handler,
|  | void * | arg )

Go through timeout list (for this task only) and remove the first matching entry (subsequent entries remain untouched), even though the timeout has not triggered yet.

Parameters

  handler | callback function that would be called by the timeout
  arg | callback argument that would be passed to handler

## Variable Documentation

## lwip_cyclic_timers

const struct lwip_cyclic_timer lwip_cyclic_timers[]

extern

This array contains all stack-internal cyclic timers. To get the number of timers, use lwip_num_cyclic_timers

This array contains all stack-internal cyclic timers. To get the number of timers, use LWIP_ARRAYSIZE()

## lwip_num_cyclic_timers

const int lwip_num_cyclic_timers

extern

Array size of lwip_cyclic_timers[]