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/* libhw/host_alarmclock.c - <libhw/generic/alarmclock.h> implementation for POSIX hosts
*
* Copyright (C) 2024-2025 Luke T. Shumaker <lukeshu@lukeshu.com>
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#include <errno.h>
#include <error.h>
#include <signal.h>
#include <libcr/coroutine.h>
#include <libmisc/assert.h>
#define IMPLEMENTATION_FOR_LIBHW_GENERIC_ALARMCLOCK_H YES
#include <libhw/generic/alarmclock.h>
#define IMPLEMENTATION_FOR_LIBHW_HOST_ALARMCLOCK_H YES
#include <libhw/host_alarmclock.h>
#include "host_util.h" /* for host_sigrt_alloc(), ns_to_host_ns_time() */
LO_IMPLEMENTATION_C(alarmclock, struct hostclock, hostclock, static)
static uint64_t hostclock_get_time_ns(struct hostclock *alarmclock) {
assert(alarmclock);
struct timespec ts;
if (clock_gettime(alarmclock->clock_id, &ts) != 0)
error(1, errno, "clock_gettime(%d)", (int)alarmclock->clock_id);
return ns_from_host_ns_time(ts);
}
static void hostclock_handle_sig_alarm(int LM_UNUSED(sig), siginfo_t *info, void *LM_UNUSED(ucontext)) {
struct hostclock *alarmclock = info->si_value.sival_ptr;
assert(alarmclock);
while (alarmclock->queue &&
alarmclock->queue->fire_at_ns <= hostclock_get_time_ns(alarmclock)) {
struct alarmclock_trigger *trigger = alarmclock->queue;
trigger->cb(trigger->cb_arg);
alarmclock->queue = trigger->next;
trigger->alarmclock = NULL;
trigger->next = NULL;
trigger->prev = NULL;
}
if (alarmclock->queue) {
struct itimerspec alarmspec = {
.it_value = ns_to_host_ns_time(alarmclock->queue->fire_at_ns),
.it_interval = {0},
};
if (timer_settime(alarmclock->timer_id, TIMER_ABSTIME, &alarmspec, NULL) != 0)
error(1, errno, "timer_settime");
}
}
static bool hostclock_add_trigger(struct hostclock *alarmclock,
struct alarmclock_trigger *trigger,
uint64_t fire_at_ns,
void (*cb)(void *),
void *cb_arg) {
assert(alarmclock);
assert(trigger);
assert(fire_at_ns);
assert(cb);
trigger->alarmclock = alarmclock;
trigger->fire_at_ns = fire_at_ns;
trigger->cb = cb;
trigger->cb_arg = cb_arg;
bool saved = cr_save_and_disable_interrupts();
struct alarmclock_trigger **dst = &alarmclock->queue;
while (*dst && fire_at_ns >= (*dst)->fire_at_ns)
dst = &(*dst)->next;
trigger->next = *dst;
trigger->prev = *dst ? (*dst)->prev : NULL;
if (*dst)
(*dst)->prev = trigger;
*dst = trigger;
if (!alarmclock->initialized) {
struct sigevent how_to_notify = {
.sigev_notify = SIGEV_SIGNAL,
.sigev_signo = host_sigrt_alloc(),
.sigev_value = {
.sival_ptr = alarmclock,
},
};
struct sigaction action = {
.sa_flags = SA_SIGINFO,
.sa_sigaction = hostclock_handle_sig_alarm,
};
if (sigaction(how_to_notify.sigev_signo, &action, NULL) != 0)
error(1, errno, "sigaction");
if (timer_create(alarmclock->clock_id, &how_to_notify, &alarmclock->timer_id) != 0)
error(1, errno, "timer_create(%d)", (int)alarmclock->clock_id);
alarmclock->initialized = true;
}
if (alarmclock->queue == trigger) {
struct itimerspec alarmspec = {
.it_value = ns_to_host_ns_time(trigger->fire_at_ns),
.it_interval = {0},
};
if (timer_settime(alarmclock->timer_id, TIMER_ABSTIME, &alarmspec, NULL) != 0)
error(1, errno, "timer_settime");
}
cr_restore_interrupts(saved);
return false;
}
static void hostclock_del_trigger(struct hostclock *alarmclock,
struct alarmclock_trigger *trigger) {
assert(alarmclock);
assert(trigger);
bool saved = cr_save_and_disable_interrupts();
if (trigger->alarmclock == alarmclock) {
if (!trigger->prev)
alarmclock->queue = trigger->next;
else
trigger->prev->next = trigger->next;
if (trigger->next)
trigger->next->prev = trigger->prev;
trigger->alarmclock = NULL;
trigger->prev = NULL;
trigger->next = NULL;
} else
assert(!trigger->alarmclock);
cr_restore_interrupts(saved);
}
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