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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/types.h>
#include <sys/event.h>
#include <sys/time.h>
#include <unistd.h>
#include "picoev.h"
#define EV_QUEUE_SZ 128
#define BACKEND_BUILD(next_fd, events) \
((unsigned)((next_fd << 8) | (events & 0xff)))
#define BACKEND_GET_NEXT_FD(backend) ((int)(backend) >> 8)
#define BACKEND_GET_OLD_EVENTS(backend) ((int)(backend) & 0xff)
typedef struct picoev_loop_kqueue_st {
picoev_loop loop;
int kq;
int changed_fds; /* link list using picoev_fd::_backend, -1 if not changed */
struct kevent events[1024];
struct kevent changelist[256];
} picoev_loop_kqueue;
picoev_globals picoev;
static int apply_pending_changes(picoev_loop_kqueue* loop, int apply_all)
{
#define SET(op, events) \
EV_SET(loop->changelist + cl_off++, loop->changed_fds, \
(((events) & PICOEV_READ) != 0 ? EVFILT_READ : 0) \
| (((events) & PICOEV_WRITE) != 0 ? EVFILT_WRITE : 0), \
(op), 0, 0, NULL)
int cl_off = 0, nevents;
while (loop->changed_fds != -1) {
picoev_fd* changed = picoev.fds + loop->changed_fds;
int old_events = BACKEND_GET_OLD_EVENTS(changed->_backend);
if (changed->events != old_events) {
if (old_events != 0) {
SET(EV_DISABLE, old_events);
}
if (changed->events != 0) {
SET(EV_ADD | EV_ENABLE, changed->events);
}
if ((size_t)cl_off + 1
>= sizeof(loop->changelist) / sizeof(loop->changelist[0])) {
nevents = kevent(loop->kq, loop->changelist, cl_off, NULL, 0, NULL);
assert(nevents == 0);
cl_off = 0;
}
}
loop->changed_fds = BACKEND_GET_NEXT_FD(changed->_backend);
changed->_backend = -1;
}
if (apply_all && cl_off != 0) {
nevents = kevent(loop->kq, loop->changelist, cl_off, NULL, 0, NULL);
assert(nevents == 0);
cl_off = 0;
}
return cl_off;
#undef SET
}
picoev_loop* picoev_create_loop(int max_timeout)
{
picoev_loop_kqueue* loop;
/* init parent */
assert(PICOEV_IS_INITED);
if ((loop = (picoev_loop_kqueue*)malloc(sizeof(picoev_loop_kqueue)))
== NULL) {
return NULL;
}
if (picoev_init_loop_internal(&loop->loop, max_timeout) != 0) {
free(loop);
return NULL;
}
/* init kqueue */
if ((loop->kq = kqueue()) == -1) {
picoev_deinit_loop_internal(&loop->loop);
free(loop);
return NULL;
}
loop->changed_fds = -1;
loop->loop.now = time(NULL);
return &loop->loop;
}
int picoev_destroy_loop(picoev_loop* _loop)
{
picoev_loop_kqueue* loop = (picoev_loop_kqueue*)_loop;
if (close(loop->kq) != 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_kqueue* loop = (picoev_loop_kqueue*)_loop;
picoev_fd* target = picoev.fds + fd;
assert(PICOEV_FD_BELONGS_TO_LOOP(&loop->loop, fd));
/* initialize if adding the fd */
if ((events & PICOEV_ADD) != 0) {
target->_backend = -1;
}
/* return if nothing to do */
if (events == PICOEV_DEL
? target->_backend == -1
: (events & PICOEV_READWRITE) == target->events) {
return 0;
}
/* add to changed list if not yet being done */
if (target->_backend == -1) {
target->_backend = BACKEND_BUILD(loop->changed_fds, target->events);
loop->changed_fds = fd;
}
/* update events */
target->events = events & PICOEV_READWRITE;
/* apply immediately if is a DELETE */
if ((events & PICOEV_DEL) != 0) {
apply_pending_changes(loop, 1);
}
return 0;
}
int picoev_poll_once_internal(picoev_loop* _loop, int max_wait)
{
picoev_loop_kqueue* loop = (picoev_loop_kqueue*)_loop;
struct timespec ts;
int cl_off = 0, nevents, i;
/* apply pending changes, with last changes stored to loop->changelist */
cl_off = apply_pending_changes(loop, 0);
ts.tv_sec = max_wait;
ts.tv_nsec = 0;
nevents = kevent(loop->kq, loop->changelist, cl_off, loop->events,
sizeof(loop->events) / sizeof(loop->events[0]), &ts);
if (nevents == -1) {
/* the errors we can only rescue */
assert(errno == EACCES || errno == EFAULT || errno == EINTR);
return -1;
}
for (i = 0; i < nevents; ++i) {
struct kevent* event = loop->events + i;
picoev_fd* target = picoev.fds + event->ident;
assert((event->flags & EV_ERROR) == 0); /* changelist errors are fatal */
if (loop->loop.loop_id == target->loop_id
&& (event->filter & (EVFILT_READ | EVFILT_WRITE)) != 0) {
int revents;
switch (event->filter) {
case EVFILT_READ:
revents = PICOEV_READ;
break;
case EVFILT_WRITE:
revents = PICOEV_WRITE;
break;
default:
assert(0);
revents = 0; // suppress compiler warning
break;
}
(*target->callback)(&loop->loop, event->ident, revents, target->cb_arg);
}
}
return 0;
}
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