Ejemplo n.º 1
0
Archivo: poll.c Proyecto: 00datman/ompi
static int
poll_add(struct event_base *base, int fd, short old, short events, void *_idx)
{
	struct pollop *pop = base->evbase;
	struct pollfd *pfd = NULL;
	struct pollidx *idx = _idx;
	int i;

	EVUTIL_ASSERT((events & EV_SIGNAL) == 0);
	if (!(events & (EV_READ|EV_WRITE)))
		return (0);

	poll_check_ok(pop);
	if (pop->nfds + 1 >= pop->event_count) {
		struct pollfd *tmp_event_set;
		int tmp_event_count;

		if (pop->event_count < 32)
			tmp_event_count = 32;
		else
			tmp_event_count = pop->event_count * 2;

		/* We need more file descriptors */
		tmp_event_set = mm_realloc(pop->event_set,
				 tmp_event_count * sizeof(struct pollfd));
		if (tmp_event_set == NULL) {
			event_warn("realloc");
			return (-1);
		}
		pop->event_set = tmp_event_set;

		pop->event_count = tmp_event_count;
		pop->realloc_copy = 1;
	}

	i = idx->idxplus1 - 1;

	if (i >= 0) {
		pfd = &pop->event_set[i];
	} else {
		i = pop->nfds++;
		pfd = &pop->event_set[i];
		pfd->events = 0;
		pfd->fd = fd;
		idx->idxplus1 = i + 1;
	}

	pfd->revents = 0;
	if (events & EV_WRITE)
		pfd->events |= POLLOUT;
	if (events & EV_READ)
		pfd->events |= POLLIN;
	poll_check_ok(pop);

	return (0);
}
Ejemplo n.º 2
0
static int
poll_del(void *arg, struct event *ev)
{
	struct pollop *pop = arg;
	struct pollfd *pfd = NULL;
	int i;

	if (ev->ev_events & EV_SIGNAL)
		return (evsignal_del(ev));

	if (!(ev->ev_events & (EV_READ|EV_WRITE)))
		return (0);

	poll_check_ok(pop);
	i = pop->idxplus1_by_fd[ev->ev_fd] - 1;
	if (i < 0)
		return (-1);

	/* Do we still want to read or write? */
	pfd = &pop->event_set[i];
	if (ev->ev_events & EV_READ) {
		pfd->events &= ~POLLIN;
		pop->event_r_back[i] = NULL;
	}
	if (ev->ev_events & EV_WRITE) {
		pfd->events &= ~POLLOUT;
		pop->event_w_back[i] = NULL;
	}
	poll_check_ok(pop);
	if (pfd->events)
		/* Another event cares about that fd. */
		return (0);

	/* Okay, so we aren't interested in that fd anymore. */
	pop->idxplus1_by_fd[ev->ev_fd] = 0;

	--pop->nfds;
	if (i != pop->nfds) {
		/* 
		 * Shift the last pollfd down into the now-unoccupied
		 * position.
		 */
		memcpy(&pop->event_set[i], &pop->event_set[pop->nfds],
		       sizeof(struct pollfd));
		pop->event_r_back[i] = pop->event_r_back[pop->nfds];
		pop->event_w_back[i] = pop->event_w_back[pop->nfds];
		pop->idxplus1_by_fd[pop->event_set[i].fd] = i + 1;
	}

	poll_check_ok(pop);
	return (0);
}
Ejemplo n.º 3
0
Archivo: poll.c Proyecto: 00datman/ompi
static int
poll_del(struct event_base *base, int fd, short old, short events, void *_idx)
{
	struct pollop *pop = base->evbase;
	struct pollfd *pfd = NULL;
	struct pollidx *idx = _idx;
	int i;

	EVUTIL_ASSERT((events & EV_SIGNAL) == 0);
	if (!(events & (EV_READ|EV_WRITE)))
		return (0);

	poll_check_ok(pop);
	i = idx->idxplus1 - 1;
	if (i < 0)
		return (-1);

	/* Do we still want to read or write? */
	pfd = &pop->event_set[i];
	if (events & EV_READ)
		pfd->events &= ~POLLIN;
	if (events & EV_WRITE)
		pfd->events &= ~POLLOUT;
	poll_check_ok(pop);
	if (pfd->events)
		/* Another event cares about that fd. */
		return (0);

	/* Okay, so we aren't interested in that fd anymore. */
	idx->idxplus1 = 0;

	--pop->nfds;
	if (i != pop->nfds) {
		/*
		 * Shift the last pollfd down into the now-unoccupied
		 * position.
		 */
		memcpy(&pop->event_set[i], &pop->event_set[pop->nfds],
		       sizeof(struct pollfd));
		idx = evmap_io_get_fdinfo(&base->io, pop->event_set[i].fd);
		EVUTIL_ASSERT(idx);
		EVUTIL_ASSERT(idx->idxplus1 == pop->nfds + 1);
		idx->idxplus1 = i + 1;
	}

	poll_check_ok(pop);
	return (0);
}
Ejemplo n.º 4
0
static int
poll_add(void *arg, struct event *ev)
{
	struct pollop *pop = arg;
	struct pollfd *pfd = NULL;
	int i;

	if (ev->ev_events & EV_SIGNAL)
		return (evsignal_add(ev));
	if (!(ev->ev_events & (EV_READ|EV_WRITE)))
		return (0);

	poll_check_ok(pop);
	if (pop->nfds + 1 >= pop->event_count) {
		struct pollfd *tmp_event_set;
		struct event **tmp_event_r_back;
		struct event **tmp_event_w_back;
		int tmp_event_count;

		if (pop->event_count < 32)
			tmp_event_count = 32;
		else
			tmp_event_count = pop->event_count * 2;

		/* We need more file descriptors */
		tmp_event_set = realloc(pop->event_set,
				 tmp_event_count * sizeof(struct pollfd));
		if (tmp_event_set == NULL) {
			event_warn("realloc");
			return (-1);
		}
		pop->event_set = tmp_event_set;

		tmp_event_r_back = realloc(pop->event_r_back,
			    tmp_event_count * sizeof(struct event *));
		if (tmp_event_r_back == NULL) {
			/* event_set overallocated; that's okay. */
			event_warn("realloc");
			return (-1);
		}
		pop->event_r_back = tmp_event_r_back;

		tmp_event_w_back = realloc(pop->event_w_back,
			    tmp_event_count * sizeof(struct event *));
		if (tmp_event_w_back == NULL) {
			/* event_set and event_r_back overallocated; that's
			 * okay. */
			event_warn("realloc");
			return (-1);
		}
		pop->event_w_back = tmp_event_w_back;

		pop->event_count = tmp_event_count;
	}
	if (ev->ev_fd >= pop->fd_count) {
		int *tmp_idxplus1_by_fd;
		int new_count;
		if (pop->fd_count < 32)
			new_count = 32;
		else
			new_count = pop->fd_count * 2;
		while (new_count <= ev->ev_fd)
			new_count *= 2;
		tmp_idxplus1_by_fd =
			realloc(pop->idxplus1_by_fd, new_count * sizeof(int));
		if (tmp_idxplus1_by_fd == NULL) {
			event_warn("realloc");
			return (-1);
		}
		pop->idxplus1_by_fd = tmp_idxplus1_by_fd;
		memset(pop->idxplus1_by_fd + pop->fd_count,
		       0, sizeof(int)*(new_count - pop->fd_count));
		pop->fd_count = new_count;
	}

	i = pop->idxplus1_by_fd[ev->ev_fd] - 1;
	if (i >= 0) {
		pfd = &pop->event_set[i];
	} else {
		i = pop->nfds++;
		pfd = &pop->event_set[i];
		pfd->events = 0;
		pfd->fd = ev->ev_fd;
		pop->event_w_back[i] = pop->event_r_back[i] = NULL;
		pop->idxplus1_by_fd[ev->ev_fd] = i + 1;
	}

	pfd->revents = 0;
	if (ev->ev_events & EV_WRITE) {
		pfd->events |= POLLOUT;
		pop->event_w_back[i] = ev;
	}
	if (ev->ev_events & EV_READ) {
		pfd->events |= POLLIN;
		pop->event_r_back[i] = ev;
	}
	poll_check_ok(pop);

	return (0);
}
Ejemplo n.º 5
0
static int
poll_dispatch(struct event_base *base, void *arg, struct timeval *tv)
{
	int res, i, j, msec = -1, nfds;
	struct pollop *pop = arg;

	poll_check_ok(pop);

	if (tv != NULL)
		msec = tv->tv_sec * 1000 + (tv->tv_usec + 999) / 1000;

	nfds = pop->nfds;
	res = poll(pop->event_set, nfds, msec);

	if (res == -1) {
		if (errno != EINTR) {
                        event_warn("poll");
			return (-1);
		}

		evsignal_process(base);
		return (0);
	} else if (base->sig.evsignal_caught) {
		evsignal_process(base);
	}

	event_debug(("%s: poll reports %d", __func__, res));

	if (res == 0 || nfds == 0)
		return (0);

	i = random() % nfds;
	for (j = 0; j < nfds; j++) {
		struct event *r_ev = NULL, *w_ev = NULL;
		int what;
		if (++i == nfds)
			i = 0;
		what = pop->event_set[i].revents;

		if (!what)
			continue;

		res = 0;

		/* If the file gets closed notify */
		if (what & (POLLHUP|POLLERR))
			what |= POLLIN|POLLOUT;
		if (what & POLLIN) {
			res |= EV_READ;
			r_ev = pop->event_r_back[i];
		}
		if (what & POLLOUT) {
			res |= EV_WRITE;
			w_ev = pop->event_w_back[i];
		}
		if (res == 0)
			continue;

		if (r_ev && (res & r_ev->ev_events)) {
			event_active(r_ev, res & r_ev->ev_events, 1);
		}
		if (w_ev && w_ev != r_ev && (res & w_ev->ev_events)) {
			event_active(w_ev, res & w_ev->ev_events, 1);
		}
	}

	return (0);
}
Ejemplo n.º 6
0
Archivo: poll.c Proyecto: 00datman/ompi
static int
poll_dispatch(struct event_base *base, struct timeval *tv)
{
	int res, i, j, nfds;
	long msec = -1;
	struct pollop *pop = base->evbase;
	struct pollfd *event_set;

	poll_check_ok(pop);

	nfds = pop->nfds;

#ifndef _EVENT_DISABLE_THREAD_SUPPORT
	if (base->th_base_lock) {
		/* If we're using this backend in a multithreaded setting,
		 * then we need to work on a copy of event_set, so that we can
		 * let other threads modify the main event_set while we're
		 * polling. If we're not multithreaded, then we'll skip the
		 * copy step here to save memory and time. */
		if (pop->realloc_copy) {
			struct pollfd *tmp = mm_realloc(pop->event_set_copy,
			    pop->event_count * sizeof(struct pollfd));
			if (tmp == NULL) {
				event_warn("realloc");
				return -1;
			}
			pop->event_set_copy = tmp;
			pop->realloc_copy = 0;
		}
		memcpy(pop->event_set_copy, pop->event_set,
		    sizeof(struct pollfd)*nfds);
		event_set = pop->event_set_copy;
	} else {
		event_set = pop->event_set;
	}
#else
	event_set = pop->event_set;
#endif

	if (tv != NULL) {
		msec = evutil_tv_to_msec(tv);
		if (msec < 0 || msec > INT_MAX)
			msec = INT_MAX;
	}

	EVBASE_RELEASE_LOCK(base, th_base_lock);

	res = poll(event_set, nfds, msec);

	EVBASE_ACQUIRE_LOCK(base, th_base_lock);

	if (res == -1) {
		if (errno != EINTR) {
			event_warn("poll");
			return (-1);
		}

		return (0);
	}

	event_debug(("%s: poll reports %d", __func__, res));

	if (res == 0 || nfds == 0)
		return (0);

	i = random() % nfds;
	for (j = 0; j < nfds; j++) {
		int what;
		if (++i == nfds)
			i = 0;
		what = event_set[i].revents;
		if (!what)
			continue;

		res = 0;

		/* If the file gets closed notify */
		if (what & (POLLHUP|POLLERR))
			what |= POLLIN|POLLOUT;
		if (what & POLLIN)
			res |= EV_READ;
		if (what & POLLOUT)
			res |= EV_WRITE;
		if (res == 0)
			continue;

		evmap_io_active(base, event_set[i].fd, res);
	}

	return (0);
}
Ejemplo n.º 7
0
int
poll_dispatch(struct event_base *base, void *arg, struct timeval *tv)
{
	int res, i, sec, nfds;
	struct pollop *pop = arg;

	poll_check_ok(pop);
	sec = tv->tv_sec * 1000 + (tv->tv_usec + 999) / 1000;
	nfds = pop->nfds;
	res = poll(pop->event_set, nfds, sec);

	if (res == -1) {
		if (errno != EINTR) {
                        event_warn("poll");
			return (-1);
		}

		evsignal_process();
		return (0);
	} else if (evsignal_caught)
		evsignal_process();

	event_debug(("%s: poll reports %d", __func__, res));

	if (res == 0)
		return (0);

	for (i = 0; i < nfds; i++) {
		int what = pop->event_set[i].revents;
		struct event *r_ev = NULL, *w_ev = NULL;
		if (!what)
			continue;

		res = 0;

		/* If the file gets closed notify */
		if (what & (POLLHUP|POLLERR))
			what |= POLLIN|POLLOUT;
		if (what & POLLIN) {
			res |= EV_READ;
			r_ev = pop->event_r_back[i];
		}
		if (what & POLLOUT) {
			res |= EV_WRITE;
			w_ev = pop->event_w_back[i];
		}
		if (res == 0)
			continue;

		if (r_ev && (res & r_ev->ev_events)) {
			if (!(r_ev->ev_events & EV_PERSIST))
				event_del(r_ev);
			event_active(r_ev, res & r_ev->ev_events, 1);
		}
		if (w_ev && w_ev != r_ev && (res & w_ev->ev_events)) {
			if (!(w_ev->ev_events & EV_PERSIST))
				event_del(w_ev);
			event_active(w_ev, res & w_ev->ev_events, 1);
		}
	}

	return (0);
}