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freebsd-skq/contrib/apr/poll/unix/kqueue.c
Peter Wemm 937a200089 Introduce svnlite so that we can check out our source code again. 
This is actually a fully functional build except:
* All internal shared libraries are static linked to make sure there
  is no interference with ports (and to reduce build time).
* It does not have the python/perl/etc plugin or API support.
* By default, it installs as "svnlite" rather than "svn".
* If WITH_SVN added in make.conf, you get "svn".
* If WITHOUT_SVNLITE is in make.conf, this is completely disabled.

To be absolutely clear, this is not intended for any use other than
checking out freebsd source and committing, like we once did with cvs.

It should be usable for small scale local repositories that don't
need the python/perl plugin architecture.
2013-06-18 02:53:45 +00:00

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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "apr.h"
#include "apr_poll.h"
#include "apr_time.h"
#include "apr_portable.h"
#include "apr_arch_file_io.h"
#include "apr_arch_networkio.h"
#include "apr_arch_poll_private.h"
#include "apr_arch_inherit.h"
#ifdef HAVE_KQUEUE
static apr_int16_t get_kqueue_revent(apr_int16_t event, apr_int16_t flags)
{
apr_int16_t rv = 0;
if (event == EVFILT_READ)
rv |= APR_POLLIN;
else if (event == EVFILT_WRITE)
rv |= APR_POLLOUT;
if (flags & EV_EOF)
rv |= APR_POLLHUP;
/* APR_POLLPRI, APR_POLLERR, and APR_POLLNVAL are not handled by this
* implementation.
* TODO: See if EV_ERROR + certain system errors in the returned data field
* should map to APR_POLLNVAL.
*/
return rv;
}
struct apr_pollset_private_t
{
int kqueue_fd;
struct kevent kevent;
apr_uint32_t setsize;
struct kevent *ke_set;
apr_pollfd_t *result_set;
#if APR_HAS_THREADS
/* A thread mutex to protect operations on the rings */
apr_thread_mutex_t *ring_lock;
#endif
/* A ring containing all of the pollfd_t that are active */
APR_RING_HEAD(pfd_query_ring_t, pfd_elem_t) query_ring;
/* A ring of pollfd_t that have been used, and then _remove'd */
APR_RING_HEAD(pfd_free_ring_t, pfd_elem_t) free_ring;
/* A ring of pollfd_t where rings that have been _remove'd but
might still be inside a _poll */
APR_RING_HEAD(pfd_dead_ring_t, pfd_elem_t) dead_ring;
};
static apr_status_t impl_pollset_cleanup(apr_pollset_t *pollset)
{
close(pollset->p->kqueue_fd);
return APR_SUCCESS;
}
static apr_status_t impl_pollset_create(apr_pollset_t *pollset,
apr_uint32_t size,
apr_pool_t *p,
apr_uint32_t flags)
{
apr_status_t rv;
pollset->p = apr_palloc(p, sizeof(apr_pollset_private_t));
#if APR_HAS_THREADS
if (flags & APR_POLLSET_THREADSAFE &&
((rv = apr_thread_mutex_create(&pollset->p->ring_lock,
APR_THREAD_MUTEX_DEFAULT,
p)) != APR_SUCCESS)) {
pollset->p = NULL;
return rv;
}
#else
if (flags & APR_POLLSET_THREADSAFE) {
pollset->p = NULL;
return APR_ENOTIMPL;
}
#endif
/* POLLIN and POLLOUT are represented in different returned
* events, so we need 2 entries per descriptor in the result set,
* both for what is returned by kevent() and what is returned to
* the caller of apr_pollset_poll() (since it doesn't spend the
* CPU to coalesce separate APR_POLLIN and APR_POLLOUT events
* for the same descriptor)
*/
pollset->p->setsize = 2 * size;
pollset->p->ke_set =
(struct kevent *) apr_palloc(p, pollset->p->setsize * sizeof(struct kevent));
memset(pollset->p->ke_set, 0, pollset->p->setsize * sizeof(struct kevent));
pollset->p->kqueue_fd = kqueue();
if (pollset->p->kqueue_fd == -1) {
pollset->p = NULL;
return apr_get_netos_error();
}
{
int flags;
if ((flags = fcntl(pollset->p->kqueue_fd, F_GETFD)) == -1)
return errno;
flags |= FD_CLOEXEC;
if (fcntl(pollset->p->kqueue_fd, F_SETFD, flags) == -1)
return errno;
}
pollset->p->result_set = apr_palloc(p, pollset->p->setsize * sizeof(apr_pollfd_t));
APR_RING_INIT(&pollset->p->query_ring, pfd_elem_t, link);
APR_RING_INIT(&pollset->p->free_ring, pfd_elem_t, link);
APR_RING_INIT(&pollset->p->dead_ring, pfd_elem_t, link);
return APR_SUCCESS;
}
static apr_status_t impl_pollset_add(apr_pollset_t *pollset,
const apr_pollfd_t *descriptor)
{
apr_os_sock_t fd;
pfd_elem_t *elem;
apr_status_t rv = APR_SUCCESS;
pollset_lock_rings();
if (!APR_RING_EMPTY(&(pollset->p->free_ring), pfd_elem_t, link)) {
elem = APR_RING_FIRST(&(pollset->p->free_ring));
APR_RING_REMOVE(elem, link);
}
else {
elem = (pfd_elem_t *) apr_palloc(pollset->pool, sizeof(pfd_elem_t));
APR_RING_ELEM_INIT(elem, link);
}
elem->pfd = *descriptor;
if (descriptor->desc_type == APR_POLL_SOCKET) {
fd = descriptor->desc.s->socketdes;
}
else {
fd = descriptor->desc.f->filedes;
}
if (descriptor->reqevents & APR_POLLIN) {
EV_SET(&pollset->p->kevent, fd, EVFILT_READ, EV_ADD, 0, 0, elem);
if (kevent(pollset->p->kqueue_fd, &pollset->p->kevent, 1, NULL, 0,
NULL) == -1) {
rv = apr_get_netos_error();
}
}
if (descriptor->reqevents & APR_POLLOUT && rv == APR_SUCCESS) {
EV_SET(&pollset->p->kevent, fd, EVFILT_WRITE, EV_ADD, 0, 0, elem);
if (kevent(pollset->p->kqueue_fd, &pollset->p->kevent, 1, NULL, 0,
NULL) == -1) {
rv = apr_get_netos_error();
}
}
if (rv == APR_SUCCESS) {
APR_RING_INSERT_TAIL(&(pollset->p->query_ring), elem, pfd_elem_t, link);
}
else {
APR_RING_INSERT_TAIL(&(pollset->p->free_ring), elem, pfd_elem_t, link);
}
pollset_unlock_rings();
return rv;
}
static apr_status_t impl_pollset_remove(apr_pollset_t *pollset,
const apr_pollfd_t *descriptor)
{
pfd_elem_t *ep;
apr_status_t rv;
apr_os_sock_t fd;
pollset_lock_rings();
if (descriptor->desc_type == APR_POLL_SOCKET) {
fd = descriptor->desc.s->socketdes;
}
else {
fd = descriptor->desc.f->filedes;
}
rv = APR_NOTFOUND; /* unless at least one of the specified conditions is */
if (descriptor->reqevents & APR_POLLIN) {
EV_SET(&pollset->p->kevent, fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
if (kevent(pollset->p->kqueue_fd, &pollset->p->kevent, 1, NULL, 0,
NULL) != -1) {
rv = APR_SUCCESS;
}
}
if (descriptor->reqevents & APR_POLLOUT) {
EV_SET(&pollset->p->kevent, fd, EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
if (kevent(pollset->p->kqueue_fd, &pollset->p->kevent, 1, NULL, 0,
NULL) != -1) {
rv = APR_SUCCESS;
}
}
for (ep = APR_RING_FIRST(&(pollset->p->query_ring));
ep != APR_RING_SENTINEL(&(pollset->p->query_ring),
pfd_elem_t, link);
ep = APR_RING_NEXT(ep, link)) {
if (descriptor->desc.s == ep->pfd.desc.s) {
APR_RING_REMOVE(ep, link);
APR_RING_INSERT_TAIL(&(pollset->p->dead_ring),
ep, pfd_elem_t, link);
break;
}
}
pollset_unlock_rings();
return rv;
}
static apr_status_t impl_pollset_poll(apr_pollset_t *pollset,
apr_interval_time_t timeout,
apr_int32_t *num,
const apr_pollfd_t **descriptors)
{
int ret, i, j;
struct timespec tv, *tvptr;
apr_status_t rv = APR_SUCCESS;
apr_pollfd_t fd;
if (timeout < 0) {
tvptr = NULL;
}
else {
tv.tv_sec = (long) apr_time_sec(timeout);
tv.tv_nsec = (long) apr_time_usec(timeout) * 1000;
tvptr = &tv;
}
ret = kevent(pollset->p->kqueue_fd, NULL, 0, pollset->p->ke_set,
pollset->p->setsize, tvptr);
(*num) = ret;
if (ret < 0) {
rv = apr_get_netos_error();
}
else if (ret == 0) {
rv = APR_TIMEUP;
}
else {
for (i = 0, j = 0; i < ret; i++) {
fd = (((pfd_elem_t*)(pollset->p->ke_set[i].udata))->pfd);
if ((pollset->flags & APR_POLLSET_WAKEABLE) &&
fd.desc_type == APR_POLL_FILE &&
fd.desc.f == pollset->wakeup_pipe[0]) {
apr_pollset_drain_wakeup_pipe(pollset);
rv = APR_EINTR;
}
else {
pollset->p->result_set[j] = fd;
pollset->p->result_set[j].rtnevents =
get_kqueue_revent(pollset->p->ke_set[i].filter,
pollset->p->ke_set[i].flags);
j++;
}
}
if ((*num = j)) { /* any event besides wakeup pipe? */
rv = APR_SUCCESS;
if (descriptors) {
*descriptors = pollset->p->result_set;
}
}
}
pollset_lock_rings();
/* Shift all PFDs in the Dead Ring to the Free Ring */
APR_RING_CONCAT(&(pollset->p->free_ring), &(pollset->p->dead_ring),
pfd_elem_t, link);
pollset_unlock_rings();
return rv;
}
static apr_pollset_provider_t impl = {
impl_pollset_create,
impl_pollset_add,
impl_pollset_remove,
impl_pollset_poll,
impl_pollset_cleanup,
"kqueue"
};
apr_pollset_provider_t *apr_pollset_provider_kqueue = &impl;
static apr_status_t cb_cleanup(void *b_)
{
apr_pollcb_t *pollcb = (apr_pollcb_t *) b_;
close(pollcb->fd);
return APR_SUCCESS;
}
static apr_status_t impl_pollcb_create(apr_pollcb_t *pollcb,
apr_uint32_t size,
apr_pool_t *p,
apr_uint32_t flags)
{
int fd;
fd = kqueue();
if (fd < 0) {
return apr_get_netos_error();
}
{
int flags;
if ((flags = fcntl(fd, F_GETFD)) == -1)
return errno;
flags |= FD_CLOEXEC;
if (fcntl(fd, F_SETFD, flags) == -1)
return errno;
}
pollcb->fd = fd;
pollcb->pollset.ke = (struct kevent *)apr_pcalloc(p, 2 * size * sizeof(struct kevent));
apr_pool_cleanup_register(p, pollcb, cb_cleanup, apr_pool_cleanup_null);
return APR_SUCCESS;
}
static apr_status_t impl_pollcb_add(apr_pollcb_t *pollcb,
apr_pollfd_t *descriptor)
{
apr_os_sock_t fd;
struct kevent ev;
apr_status_t rv = APR_SUCCESS;
if (descriptor->desc_type == APR_POLL_SOCKET) {
fd = descriptor->desc.s->socketdes;
}
else {
fd = descriptor->desc.f->filedes;
}
if (descriptor->reqevents & APR_POLLIN) {
EV_SET(&ev, fd, EVFILT_READ, EV_ADD, 0, 0, descriptor);
if (kevent(pollcb->fd, &ev, 1, NULL, 0, NULL) == -1) {
rv = apr_get_netos_error();
}
}
if (descriptor->reqevents & APR_POLLOUT && rv == APR_SUCCESS) {
EV_SET(&ev, fd, EVFILT_WRITE, EV_ADD, 0, 0, descriptor);
if (kevent(pollcb->fd, &ev, 1, NULL, 0, NULL) == -1) {
rv = apr_get_netos_error();
}
}
return rv;
}
static apr_status_t impl_pollcb_remove(apr_pollcb_t *pollcb,
apr_pollfd_t *descriptor)
{
apr_status_t rv;
struct kevent ev;
apr_os_sock_t fd;
if (descriptor->desc_type == APR_POLL_SOCKET) {
fd = descriptor->desc.s->socketdes;
}
else {
fd = descriptor->desc.f->filedes;
}
rv = APR_NOTFOUND; /* unless at least one of the specified conditions is */
if (descriptor->reqevents & APR_POLLIN) {
EV_SET(&ev, fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
if (kevent(pollcb->fd, &ev, 1, NULL, 0, NULL) != -1) {
rv = APR_SUCCESS;
}
}
if (descriptor->reqevents & APR_POLLOUT) {
EV_SET(&ev, fd, EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
if (kevent(pollcb->fd, &ev, 1, NULL, 0, NULL) != -1) {
rv = APR_SUCCESS;
}
}
return rv;
}
static apr_status_t impl_pollcb_poll(apr_pollcb_t *pollcb,
apr_interval_time_t timeout,
apr_pollcb_cb_t func,
void *baton)
{
int ret, i;
struct timespec tv, *tvptr;
apr_status_t rv = APR_SUCCESS;
if (timeout < 0) {
tvptr = NULL;
}
else {
tv.tv_sec = (long) apr_time_sec(timeout);
tv.tv_nsec = (long) apr_time_usec(timeout) * 1000;
tvptr = &tv;
}
ret = kevent(pollcb->fd, NULL, 0, pollcb->pollset.ke, 2 * pollcb->nalloc,
tvptr);
if (ret < 0) {
rv = apr_get_netos_error();
}
else if (ret == 0) {
rv = APR_TIMEUP;
}
else {
for (i = 0; i < ret; i++) {
apr_pollfd_t *pollfd = (apr_pollfd_t *)(pollcb->pollset.ke[i].udata);
pollfd->rtnevents = get_kqueue_revent(pollcb->pollset.ke[i].filter,
pollcb->pollset.ke[i].flags);
rv = func(baton, pollfd);
if (rv) {
return rv;
}
}
}
return rv;
}
static apr_pollcb_provider_t impl_cb = {
impl_pollcb_create,
impl_pollcb_add,
impl_pollcb_remove,
impl_pollcb_poll,
"kqueue"
};
apr_pollcb_provider_t *apr_pollcb_provider_kqueue = &impl_cb;
#endif /* HAVE_KQUEUE */
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