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/* SPDX-License-Identifier: GPL-2.0 */
#include <inttypes.h>
#include <sys/timerfd.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include "main.h"
#include "uring.h"
#include "ptimer.h"
struct ptimer {
uint64_t value;
time_t previous_time;
struct uring_task task;
unsigned task_count;
struct list_head ptasks;
};
static void ptimer_set(unsigned value, unsigned interval)
{
struct itimerspec tspec = {
.it_interval = { .tv_sec = interval, .tv_nsec = 0 },
.it_value = { .tv_sec = value, .tv_nsec = 0 }
};
assert_return(cfg->ptimer && cfg->ptimer->task.fd >= 0);
if (timerfd_settime(cfg->ptimer->task.fd, 0, &tspec, NULL) != 0)
error("timerfd_settime: %m");
}
static unsigned gcd(unsigned a, unsigned b)
{
if (a == 0)
return b;
return gcd(b % a, a);
}
static unsigned array_gcd(unsigned arr[], unsigned n)
{
unsigned result = arr[0];
for (unsigned i = 1; i < n; i++)
result = gcd(arr[i], result);
return result;
}
static void ptimer_tick(struct ptimer *ptimer)
{
time_t now = time(NULL);
unsigned diff = (unsigned)(now - ptimer->previous_time);
struct ptimer_task *ptask, *ptmp;
debug(DBG_TIMER, "got a tick of %u secs", diff);
list_for_each_entry_safe(ptask, ptmp, &ptimer->ptasks, list) {
if (ptask->remain > diff) {
ptask->remain -= diff;
continue;
}
debug(DBG_TIMER, "triggering ptask %p (times %u)", ptask,
ptask->times);
ptask->cb(ptask);
ptask->remain = ptask->interval;
if (ptask->times == 0)
continue;
ptask->times--;
if (ptask->times == 0) {
ptask->active = false;
list_del(&ptask->list);
}
}
ptimer->previous_time = now;
}
static void ptimer_reconfig(struct ptimer *ptimer)
{
struct ptimer_task *ptask;
unsigned i = 0;
unsigned lowest = ~0;
unsigned interval;
if (list_empty(&ptimer->ptasks)) {
debug(DBG_TIMER, "no tasks");
ptimer_set(0, 0);
return;
}
unsigned intervals[ptimer->task_count];
list_for_each_entry(ptask, &ptimer->ptasks, list) {
if (ptask->remain < lowest)
lowest = ptask->remain;
intervals[i++] = ptask->interval;
}
interval = array_gcd(intervals, i);
debug(DBG_TIMER, "lowest: %u, gcd: %u\n", lowest, interval);
ptimer_set(lowest, interval);
}
void ptimer_del_task(struct ptimer_task *ptask)
{
struct ptimer *ptimer = cfg->ptimer;
assert_return(ptask && ptimer);
assert_return_silent(ptask->active);
assert_return(ptimer->task_count > 0);
list_del(&ptask->list);
ptask->active = false;
ptimer->task_count--;
ptimer_tick(ptimer);
ptimer_reconfig(ptimer);
uring_task_put(&ptimer->task);
}
void ptimer_add_task(struct ptimer_task *ptask)
{
struct ptimer *ptimer = cfg->ptimer;
assert_return(ptask && ptask->interval > 0 && ptask->cb && ptimer);
assert_return_silent(!ptask->active);
uring_task_get(&ptimer->task);
ptask->active = true;
ptask->remain = ptask->interval;
ptimer_tick(ptimer);
list_add(&ptask->list, &ptimer->ptasks);
ptimer->task_count++;
ptimer_reconfig(ptimer);
}
void ptimer_refdump()
{
assert_return(cfg->ptimer);
uring_task_refdump(&cfg->ptimer->task);
}
static void ptimer_free(struct uring_task *task)
{
struct ptimer *ptimer = container_of(task, struct ptimer, task);
assert_return(task);
debug(DBG_TIMER, "task %p, ptimer %p", task, ptimer);
xfree(ptimer);
cfg->ptimer = NULL;
}
void ptimer_delete()
{
assert_return(cfg->ptimer);
debug(DBG_TIMER, "closing fd %i", cfg->ptimer->task.fd);
uring_task_destroy(&cfg->ptimer->task);
}
static void ptimer_cb(struct uring_task *task, int res)
{
struct ptimer *ptimer = container_of(task, struct ptimer, task);
assert_return(task);
assert_task_alive(DBG_IGMP, task);
if (res != sizeof(ptimer->value)) {
error("timerfd_read: res: %i, %m", res);
return;
}
ptimer_tick(ptimer);
uring_read(&ptimer->task, &ptimer->value, sizeof(ptimer->value),
ptimer_cb);
}
void ptimer_init()
{
struct ptimer *ptimer;
int tfd;
assert_return(!cfg->ptimer);
ptimer = zmalloc(sizeof(*ptimer));
if (!ptimer)
die("malloc: %m");
tfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
if (tfd < 0)
die("timerfd_create: %m");
ptimer->task_count = 0;
ptimer->previous_time = time(NULL);
INIT_LIST_HEAD(&ptimer->ptasks);
uring_task_init(&ptimer->task, "ptimer", uring_parent(), ptimer_free);
uring_task_set_fd(&ptimer->task, tfd);
cfg->ptimer = ptimer;
uring_read(&ptimer->task, &ptimer->value, sizeof(ptimer->value),
ptimer_cb);
}
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