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/*
* BIRD -- Timers
*
* (c) 2013--2017 Ondrej Zajicek <santiago@crfreenet.org>
* (c) 2013--2017 CZ.NIC z.s.p.o.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <stdlib.h>
#include "nest/bird.h"
#include "lib/heap.h"
#include "lib/resource.h"
#include "lib/timer.h"
struct timeloop main_timeloop;
#ifdef USE_PTHREADS
#include <pthread.h>
/* Data accessed and modified from proto/bfd/io.c */
pthread_key_t current_time_key;
static inline struct timeloop *
timeloop_current(void)
{
return pthread_getspecific(current_time_key);
}
static inline void
timeloop_init_current(void)
{
pthread_key_create(¤t_time_key, NULL);
pthread_setspecific(current_time_key, &main_timeloop);
}
void wakeup_kick_current(void);
#else
/* Just use main timelooop */
static inline struct timeloop * timeloop_current(void) { return &main_timeloop; }
static inline void timeloop_init_current(void) { }
#endif
btime
current_time(void)
{
return timeloop_current()->last_time;
}
btime
current_real_time(void)
{
struct timeloop *loop = timeloop_current();
if (!loop->real_time)
times_update_real_time(loop);
return loop->real_time;
}
#define TIMER_LESS(a,b) ((a)->expires < (b)->expires)
#define TIMER_SWAP(heap,a,b,t) (t = heap[a], heap[a] = heap[b], heap[b] = t, \
heap[a]->index = (a), heap[b]->index = (b))
static void
tm2_free(resource *r)
{
timer2 *t = (timer2 *) r;
tm2_stop(t);
}
static void
tm2_dump(resource *r)
{
timer2 *t = (timer2 *) r;
debug("(code %p, data %p, ", t->hook, t->data);
if (t->randomize)
debug("rand %d, ", t->randomize);
if (t->recurrent)
debug("recur %d, ", t->recurrent);
if (t->expires)
debug("expires in %d ms)\n", (t->expires - current_time()) TO_MS);
else
debug("inactive)\n");
}
static struct resclass tm2_class = {
"Timer",
sizeof(timer2),
tm2_free,
tm2_dump,
NULL,
NULL
};
timer2 *
tm2_new(pool *p)
{
timer2 *t = ralloc(p, &tm2_class);
t->index = -1;
return t;
}
void
tm2_set(timer2 *t, btime when)
{
struct timeloop *loop = timeloop_current();
uint tc = timers_count(loop);
if (!t->expires)
{
t->index = ++tc;
t->expires = when;
BUFFER_PUSH(loop->timers) = t;
HEAP_INSERT(loop->timers.data, tc, timer2 *, TIMER_LESS, TIMER_SWAP);
}
else if (t->expires < when)
{
t->expires = when;
HEAP_INCREASE(loop->timers.data, tc, timer2 *, TIMER_LESS, TIMER_SWAP, t->index);
}
else if (t->expires > when)
{
t->expires = when;
HEAP_DECREASE(loop->timers.data, tc, timer2 *, TIMER_LESS, TIMER_SWAP, t->index);
}
#ifdef CONFIG_BFD
/* Hack to notify BFD loops */
if ((loop != &main_timeloop) && (t->index == 1))
wakeup_kick_current();
#endif
}
void
tm2_start(timer2 *t, btime after)
{
tm2_set(t, current_time() + MAX(after, 0));
}
void
tm2_stop(timer2 *t)
{
if (!t->expires)
return;
struct timeloop *loop = timeloop_current();
uint tc = timers_count(loop);
HEAP_DELETE(loop->timers.data, tc, timer2 *, TIMER_LESS, TIMER_SWAP, t->index);
BUFFER_POP(loop->timers);
t->index = -1;
t->expires = 0;
}
void
timers_init(struct timeloop *loop, pool *p)
{
times_init(loop);
BUFFER_INIT(loop->timers, p, 4);
BUFFER_PUSH(loop->timers) = NULL;
}
void io_log_event(void *hook, void *data);
void
timers_fire(struct timeloop *loop)
{
btime base_time;
timer2 *t;
times_update(loop);
base_time = loop->last_time;
while (t = timers_first(loop))
{
if (t->expires > base_time)
return;
if (t->recurrent)
{
btime when = t->expires + t->recurrent;
if (when <= loop->last_time)
when = loop->last_time + t->recurrent;
if (t->randomize)
when += random() % (t->randomize + 1);
tm2_set(t, when);
}
else
tm2_stop(t);
/* This is ugly hack, we want to log just timers executed from the main I/O loop */
if (loop == &main_timeloop)
io_log_event(t->hook, t->data);
t->hook(t);
}
}
void
timer_init(void)
{
timers_init(&main_timeloop, &root_pool);
timeloop_init_current();
}
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