libhw_generic/alarmclock.c


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/* libhw_generic/alarmclock.c - Device-independent <libhw/generic/alarmclock.h> utilities
 *
 * Copyright (C) 2024  Luke T. Shumaker <lukeshu@lukeshu.com>
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

#include <libcr/coroutine.h>
#include <libmisc/vcall.h>

#include <libhw/generic/alarmclock.h>

static void alarmclock_sleep_intrhandler(void *_arg) {
	cid_t cid = *(cid_t *)_arg;
	cr_unpause_from_intrhandler(cid);
}

void alarmclock_sleep_until_ns(implements_alarmclock *clock, uint64_t abstime_ns) {
	bool saved = cr_save_and_disable_interrupts();
	cid_t cid = cr_getcid();
	struct alarmclock_trigger trigger;
	VCALL(clock, add_trigger, &trigger, abstime_ns, alarmclock_sleep_intrhandler, &cid);
	cr_pause_and_yield();
	cr_restore_interrupts(saved);
}