int st_usleep(st_utime_t usecs)
{
_st_thread_t *me = _ST_CURRENT_THREAD();
if (me->flags & _ST_FL_INTERRUPT) {
me->flags &= ~_ST_FL_INTERRUPT;
errno = EINTR;
return -1;
}
if (usecs != ST_UTIME_NO_TIMEOUT) {
me->state = _ST_ST_SLEEPING;
_ST_ADD_SLEEPQ(me, usecs);
} else
me->state = _ST_ST_SUSPENDED;
_ST_SWITCH_CONTEXT(me);
if (me->flags & _ST_FL_INTERRUPT) {
me->flags &= ~_ST_FL_INTERRUPT;
errno = EINTR;
return -1;
}
return 0;
}
int st_poll(struct pollfd *pds, int npds, st_utime_t timeout)
{
struct pollfd *pd;
struct pollfd *epd = pds + npds;
_st_pollq_t pq;
_st_thread_t *me = _ST_CURRENT_THREAD();
int n;
if (me->flags & _ST_FL_INTERRUPT) {
me->flags &= ~_ST_FL_INTERRUPT;
errno = EINTR;
return -1;
}
if ((*_st_eventsys->pollset_add)(pds, npds) < 0)
return -1;
pq.pds = pds;
pq.npds = npds;
pq.thread = me;
pq.on_ioq = 1;
_ST_ADD_IOQ(pq);
if (timeout != ST_UTIME_NO_TIMEOUT)
_ST_ADD_SLEEPQ(me, timeout);
me->state = _ST_ST_IO_WAIT;
_ST_SWITCH_CONTEXT(me);
n = 0;
if (pq.on_ioq) {
/* If we timed out, the pollq might still be on the ioq. Remove it */
_ST_DEL_IOQ(pq);
(*_st_eventsys->pollset_del)(pds, npds);
} else {
/* Count the number of ready descriptors */
for (pd = pds; pd < epd; pd++) {
if (pd->revents)
n++;
}
}
if (me->flags & _ST_FL_INTERRUPT) {
me->flags &= ~_ST_FL_INTERRUPT;
errno = EINTR;
return -1;
}
return n;
}
int st_cond_timedwait(_st_cond_t *cvar, st_utime_t timeout)
{
_st_thread_t *me = _ST_CURRENT_THREAD();
int rv;
if (me->flags & _ST_FL_INTERRUPT) {
me->flags &= ~_ST_FL_INTERRUPT;
errno = EINTR;
return -1;
}
/* Put caller thread on the condition variable's wait queue */
me->state = _ST_ST_COND_WAIT;
ST_APPEND_LINK(&me->wait_links, &cvar->wait_q);
if (timeout != ST_UTIME_NO_TIMEOUT)
_ST_ADD_SLEEPQ(me, timeout);
_ST_SWITCH_CONTEXT(me);
ST_REMOVE_LINK(&me->wait_links);
rv = 0;
if (me->flags & _ST_FL_TIMEDOUT) {
me->flags &= ~_ST_FL_TIMEDOUT;
errno = ETIME;
rv = -1;
}
if (me->flags & _ST_FL_INTERRUPT) {
me->flags &= ~_ST_FL_INTERRUPT;
errno = EINTR;
rv = -1;
}
return rv;
}