SYNOPSIS

#include <iv.h>

struct iv_timer {
struct timespec expires;
void *cookie;
void (*handler)(void *);
};

void IV_TIMER_INIT(struct iv_timer *timer);
void iv_timer_register(struct iv_timer *timer);
void iv_timer_unregister(struct iv_timer *timer);
int iv_timer_registered(struct iv_timer *timer);

DESCRIPTION

The functions iv_timer_register and iv_timer_unregister register, respectively unregister, a timer with the current thread's ivykis event loop. iv_timer_registered on a timer returns true if that timer is currently registered with ivykis.

When a timer that is registered becomes 'ready', due to the current system clock value becoming greater than or equal to the timer's ->expires member field, the callback function specified by ->handler is called in the thread that the timer was registered in, with ->cookie as its first and sole argument. When this happens, the timer is transparently unregistered.

The application is allowed to change the ->cookie and ->handler members at any time. The application is not allowed to change the ->expires member while the timer is registered.

A given struct iv_timer can only be registered in one thread at a time, and a timer can only be unregistered in the thread that it was registered from.

There is no limit on the number of timers registered at once.

See iv_examples(3) for programming examples.