Function zthr_create_timer

freebsd/contrib/openzfs/module/zfs/zthr.c:283–306

* Create a zthr with specified maximum sleep time. If the time * in sleeping state exceeds max_sleep, a wakeup(do the check and * start working if required) will be triggered. */

 * start working if required) will be triggered.
 */
zthr_t *
zthr_create_timer(const char *zthr_name, zthr_checkfunc_t *checkfunc,
    zthr_func_t *func, void *arg, hrtime_t max_sleep)
{
	zthr_t *t = kmem_zalloc(sizeof (*t), KM_SLEEP);
	mutex_init(&t->zthr_state_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&t->zthr_request_lock, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&t->zthr_cv, NULL, CV_DEFAULT, NULL);
	cv_init(&t->zthr_wait_cv, NULL, CV_DEFAULT, NULL);

	mutex_enter(&t->zthr_state_lock);
	t->zthr_checkfunc = checkfunc;
	t->zthr_func = func;
	t->zthr_arg = arg;
	t->zthr_sleep_timeout = max_sleep;
	t->zthr_name = zthr_name;

	t->zthr_thread = thread_create_named(zthr_name, NULL, 0,
	    zthr_procedure, t, 0, &p0, TS_RUN, minclsyspri);

	mutex_exit(&t->zthr_state_lock);

	return (t);
}

void
zthr_destroy(zthr_t *t)