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/*****************************************************************************
Copyright (c) 2006 EMC Corporation.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59
Temple Place - Suite 330, Boston, MA 02111-1307, USA.
The full GNU General Public License is included in this distribution in the
file called LICENSE.
Authors: Srinivas Aji <Aji_Srinivas@emc.com>
******************************************************************************/
#include "epoll_loop.h"
#include <sys/epoll.h>
#include <errno.h>
#include <sys/time.h>
#include <time.h>
#include <stdio.h>
#include <unistd.h>
#include "bridge_ctl.h"
// globals
int epoll_fd = -1;
struct timeval nexttimeout;
int init_epoll(void)
{
int r = epoll_create(128);
if (r < 0) {
fprintf(stderr, "epoll_create failed: %m\n");
return -1;
}
epoll_fd = r;
return 0;
}
int add_epoll(struct epoll_event_handler *h)
{
struct epoll_event ev = {
.events = EPOLLIN,
.data.ptr = h,
};
h->ref_ev = NULL;
int r = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, h->fd, &ev);
if (r < 0) {
fprintf(stderr, "epoll_ctl_add: %m\n");
return -1;
}
return 0;
}
int remove_epoll(struct epoll_event_handler *h)
{
int r = epoll_ctl(epoll_fd, EPOLL_CTL_DEL, h->fd, NULL);
if (r < 0) {
fprintf(stderr, "epoll_ctl_del: %m\n");
return -1;
}
if (h->ref_ev && h->ref_ev->data.ptr == h) {
h->ref_ev->data.ptr = NULL;
h->ref_ev = NULL;
}
return 0;
}
void clear_epoll(void)
{
if (epoll_fd >= 0)
close(epoll_fd);
}
int time_diff(struct timeval *second, struct timeval *first)
{
return (second->tv_sec - first->tv_sec) * 1000
+ (second->tv_usec - first->tv_usec) / 1000;
}
void run_timeouts(void)
{
bridge_one_second();
nexttimeout.tv_sec++;
}
int epoll_main_loop(void)
{
gettimeofday(&nexttimeout, NULL);
nexttimeout.tv_sec++;
#define EV_SIZE 8
struct epoll_event ev[EV_SIZE];
while (1) {
int r, i;
int timeout;
struct timeval tv;
gettimeofday(&tv, NULL);
timeout = time_diff(&nexttimeout, &tv);
if (timeout < 0) {
run_timeouts();
timeout = 0;
}
r = epoll_wait(epoll_fd, ev, EV_SIZE, timeout);
if (r < 0 && errno != EINTR) {
fprintf(stderr, "epoll_wait: %m\n");
return -1;
}
for (i = 0; i < r; i++) {
struct epoll_event_handler *p = ev[i].data.ptr;
if (p != NULL)
p->ref_ev = &ev[i];
}
for (i = 0; i < r; i++) {
struct epoll_event_handler *p = ev[i].data.ptr;
if (p && p->handler)
p->handler(ev[i].events, p);
}
for (i = 0; i < r; i++) {
struct epoll_event_handler *p = ev[i].data.ptr;
if (p != NULL)
p->ref_ev = NULL;
}
}
return 0;
}
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