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/*
* Copyright (c) 2009, Cybozu Labs, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of the <ORGANIZATION> nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <errno.h>
#include <sys/epoll.h>
#include <unistd.h>
#include "picoev.h"
#ifndef PICOEV_EPOLL_DEFER_DELETES
# define PICOEV_EPOLL_DEFER_DELETES 1
#endif
typedef struct picoev_loop_epoll_st {
picoev_loop loop;
int epfd;
struct epoll_event events[1024];
} picoev_loop_epoll;
picoev_globals picoev;
picoev_loop* picoev_create_loop(int max_timeout)
{
picoev_loop_epoll* loop;
/* init parent */
assert(PICOEV_IS_INITED);
if ((loop = (picoev_loop_epoll*)malloc(sizeof(picoev_loop_epoll))) == NULL) {
return NULL;
}
if (picoev_init_loop_internal(&loop->loop, max_timeout) != 0) {
free(loop);
return NULL;
}
/* init myself */
if ((loop->epfd = epoll_create(picoev.max_fd)) == -1) {
picoev_deinit_loop_internal(&loop->loop);
free(loop);
return NULL;
}
loop->loop.now = time(NULL);
return &loop->loop;
}
int picoev_destroy_loop(picoev_loop* _loop)
{
picoev_loop_epoll* loop = (picoev_loop_epoll*)_loop;
if (close(loop->epfd) != 0) {
return -1;
}
picoev_deinit_loop_internal(&loop->loop);
free(loop);
return 0;
}
int picoev_update_events_internal(picoev_loop* _loop, int fd, int events)
{
picoev_loop_epoll* loop = (picoev_loop_epoll*)_loop;
picoev_fd* target = picoev.fds + fd;
struct epoll_event ev;
int epoll_ret;
memset( &ev, 0, sizeof( ev ) );
assert(PICOEV_FD_BELONGS_TO_LOOP(&loop->loop, fd));
if ((events & PICOEV_READWRITE) == target->events) {
return 0;
}
ev.events = ((events & PICOEV_READ) != 0 ? EPOLLIN : 0)
| ((events & PICOEV_WRITE) != 0 ? EPOLLOUT : 0);
ev.data.fd = fd;
#define SET(op, check_error) do { \
epoll_ret = epoll_ctl(loop->epfd, op, fd, &ev); \
assert(! check_error || epoll_ret == 0); \
} while (0)
#if PICOEV_EPOLL_DEFER_DELETES
if ((events & PICOEV_DEL) != 0) {
/* nothing to do */
} else if ((events & PICOEV_READWRITE) == 0) {
SET(EPOLL_CTL_DEL, 1);
} else {
SET(EPOLL_CTL_MOD, 0);
if (epoll_ret != 0) {
assert(errno == ENOENT);
SET(EPOLL_CTL_ADD, 1);
}
}
#else
if ((events & PICOEV_READWRITE) == 0) {
SET(EPOLL_CTL_DEL, 1);
} else {
SET(target->events == 0 ? EPOLL_CTL_ADD : EPOLL_CTL_MOD, 1);
}
#endif
#undef SET
target->events = events;
return 0;
}
int picoev_poll_once_internal(picoev_loop* _loop, int max_wait)
{
picoev_loop_epoll* loop = (picoev_loop_epoll*)_loop;
int i, nevents;
nevents = epoll_wait(loop->epfd, loop->events,
sizeof(loop->events) / sizeof(loop->events[0]),
max_wait * 1000);
if (nevents == -1) {
return -1;
}
for (i = 0; i < nevents; ++i) {
struct epoll_event* event = loop->events + i;
picoev_fd* target = picoev.fds + event->data.fd;
if (loop->loop.loop_id == target->loop_id
&& (target->events & PICOEV_READWRITE) != 0) {
int revents = ((event->events & EPOLLIN) != 0 ? PICOEV_READ : 0)
| ((event->events & EPOLLOUT) != 0 ? PICOEV_WRITE : 0);
if (revents != 0) {
(*target->callback)(&loop->loop, event->data.fd, revents,
target->cb_arg);
}
} else {
#if PICOEV_EPOLL_DEFER_DELETES
event->events = 0;
epoll_ctl(loop->epfd, EPOLL_CTL_DEL, event->data.fd, event);
#endif
}
}
return 0;
}
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