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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>
#define TF_FD_AUTOCLOSE 1
#define TF_FD_RESTORE_BLOCKING 2
#define TF_FD_STREAM_ORIENTED 4
static int tf_fd_init(struct tf_fd *fd, int kfd, int flags)
{
struct tf_poll_data *pd = &tf_get_scheduler()->poll_data;
struct epoll_event ev;
int r;
ev.events = EPOLLIN | EPOLLOUT | EPOLLET;
ev.data.ptr = fd;
r = epoll_ctl(pd->epoll_fd, EPOLL_CTL_ADD, kfd, &ev);
if (r < 0) {
TF_BUG_ON(errno == EEXIST);
return -errno;
}
fd->fd = kfd;
fd->flags = flags;
fd->waiting_fiber = NULL;
return 0;
}
static void tf_fd_wait(struct tf_fd *fd, int events)
{
struct tf_poll_data *pd = &tf_get_scheduler()->poll_data;
TF_BUG_ON(fd->waiting_fiber != NULL);
fd->events = events | EPOLLERR | EPOLLHUP;
fd->waiting_fiber = tf_get_fiber();
pd->num_waiters++;
}
static void tf_fd_release(struct tf_fd *fd)
{
struct tf_poll_data *pd = &tf_get_scheduler()->poll_data;
fd->waiting_fiber = NULL;
fd->events = 0;
pd->num_waiters--;
}
void tf_poll_init(void)
{
struct tf_poll_data *pd = &tf_get_scheduler()->poll_data;
pd->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
pd->num_waiters = 0;
TF_BUG_ON(pd->epoll_fd < 0);
}
int tf_poll(tf_mtime_diff_t timeout)
{
struct tf_poll_data *pd = &tf_get_scheduler()->poll_data;
struct epoll_event events[64];
struct tf_fd *fd;
int ret = (timeout == 0) ? TF_WAKEUP_TIMEOUT : TF_WAKEUP_FD;
int r, i;
if (timeout == 0 && pd->num_waiters == 0)
return ret;
do {
r = epoll_wait(pd->epoll_fd, events, array_size(events), timeout);
for (i = 0; i < r; i++) {
fd = (struct tf_fd *) events[i].data.ptr;
if (likely(fd->events & events[i].events))
tf_wakeup(fd->waiting_fiber, TF_WAKEUP_FD);
}
if (timeout != 0)
ret = TF_WAKEUP_FD;
timeout = 0;
} while (unlikely(r == array_size(events)));
return ret;
}
void tf_poll_close(void)
{
struct tf_poll_data *pd = &tf_get_scheduler()->poll_data;
close(pd->epoll_fd);
}
#include "io-unix.c"
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