int mill_choose_wait(void) {
struct mill_choose *uc = &mill_running->u_choose;
struct mill_slist_item *it;
struct mill_clause *cl = NULL;
/* If there are clauses that are immediately available
randomly choose one of them. */
if(uc->available > 0) {
int chosen = uc->available == 1 ? 0 : (int)(random() % (uc->available));
for(it = mill_slist_begin(&uc->clauses); it; it = mill_slist_next(it)) {
cl = mill_cont(it, struct mill_clause, chitem);
if(!cl->available)
continue;
if(!chosen)
break;
--chosen;
}
struct mill_chan *ch = mill_getchan(cl->ep);
if(cl->ep->type == MILL_SENDER)
mill_enqueue(ch, cl->val);
else
mill_dequeue(ch, mill_valbuf(cl->cr, ch->sz));
mill_resume(mill_running, cl->idx);
return mill_suspend();
}
int mill_fdwait_(int fd, int events, int64_t deadline, const char *current) {
check_poller_initialised();
/* If required, start waiting for the timeout. */
if(deadline >= 0)
mill_timer_add(&mill_running->timer, deadline, mill_poller_callback);
/* If required, start waiting for the file descriptor. */
if(fd >= 0)
mill_poller_add(fd, events);
/* Do actual waiting. */
mill_running->state = fd < 0 ? MILL_MSLEEP : MILL_FDWAIT;
mill_running->fd = fd;
mill_running->events = events;
mill_set_current(&mill_running->debug, current);
int rc = mill_suspend();
/* Handle file descriptor events. */
if(rc >= 0) {
mill_assert(!mill_timer_enabled(&mill_running->timer));
return rc;
}
/* Handle the timeout. */
mill_assert(mill_running->fd == -1);
return 0;
}