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/* io-epoll.c - epoll(7) based file descriptor monitoring
*
* Copyright (C) 2009 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 or later as
* published by the Free Software Foundation.
*
* See http://www.gnu.org/ for details.
*/
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/epoll.h>
#include <libtf/io.h>
#include <libtf/fiber.h>
struct tf_epoll_data {
int epoll_fd;
};
static void tf_epoll_main(void *ctx)
{
struct tf_epoll_data *pd = ctx;
struct epoll_event events[64];
struct tf_fd *fd;
int r, i;
do {
r = epoll_wait(pd->epoll_fd, events, array_size(events), 0);
if (r == 0) {
/* FIXME: yielding is bad */
struct tf_fiber *self = tf_vmach_get_current_fiber();
tf_list_add_tail(&self->queue_node, &self->wakeup_q);
if (tf_fiber_schedule() == 0)
continue;
}
for (i = 0; i < r; i++) {
fd = (struct tf_fd *) events[i].data.ptr;
tf_fiber_wakeup(fd->fiber);
}
} while (1);
close(pd->epoll_fd);
}
static void *tf_epoll_create(void)
{
struct tf_epoll_data *d;
d = tf_fiber_create(tf_epoll_main, sizeof(struct tf_epoll_data));
if (d == NULL)
return NULL;
d->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
TF_BUG_ON(d->epoll_fd < 0);
tf_fiber_run(tf_fiber_get(d));
return d;
}
static int tf_epoll_fd_created(void *fiber, struct tf_fd *fd)
{
struct tf_epoll_data *d = fiber;
struct epoll_event ev;
int r;
ev = (struct epoll_event) {
.events = EPOLLET,
.data.ptr = fd,
};
if (fd->flags & TF_FD_READ)
ev.events |= EPOLLIN;
if (fd->flags & TF_FD_WRITE)
ev.events |= EPOLLOUT;
r = epoll_ctl(d->epoll_fd, EPOLL_CTL_ADD, fd->fd, &ev);
if (unlikely(r < 0)) {
TF_BUG_ON(errno == EEXIST);
r = -errno;
return r;
}
return 0;
}
static int tf_epoll_fd_destroyed(void *fiber, struct tf_fd *fd)
{
struct tf_epoll_data *d = fiber;
if (!(fd->flags & TF_FD_AUTOCLOSE))
epoll_ctl(d->epoll_fd, EPOLL_CTL_DEL, fd->fd, NULL);
return 0;
}
struct tf_poll_hooks tf_epoll_hooks = {
.create = tf_epoll_create,
.fd_created = tf_epoll_fd_created,
.fd_destroyed = tf_epoll_fd_destroyed,
};
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