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/* Copyright 2000-2004 The Apache Software Foundation
*
* Licensed 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_arch_poll_private.h"
#ifdef POLLSET_USES_PORT
static apr_int16_t get_event(apr_int16_t event)
{
apr_int16_t rv = 0;
if (event & APR_POLLIN)
rv |= POLLIN;
if (event & APR_POLLPRI)
rv |= POLLPRI;
if (event & APR_POLLOUT)
rv |= POLLOUT;
if (event & APR_POLLERR)
rv |= POLLERR;
if (event & APR_POLLHUP)
rv |= POLLHUP;
if (event & APR_POLLNVAL)
rv |= POLLNVAL;
return rv;
}
static apr_int16_t get_revent(apr_int16_t event)
{
apr_int16_t rv = 0;
if (event & POLLIN)
rv |= APR_POLLIN;
if (event & POLLPRI)
rv |= APR_POLLPRI;
if (event & POLLOUT)
rv |= APR_POLLOUT;
if (event & POLLERR)
rv |= APR_POLLERR;
if (event & POLLHUP)
rv |= APR_POLLHUP;
if (event & POLLNVAL)
rv |= APR_POLLNVAL;
return rv;
}
struct apr_pollset_t
{
apr_pool_t *pool;
apr_uint32_t nelts;
apr_uint32_t nalloc;
int port_fd;
port_event_t *port_set;
apr_pollfd_t *result_set;
apr_uint32_t flags;
#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;
APR_RING_HEAD(pfd_add_ring_t, pfd_elem_t) add_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 backend_cleanup(void *p_)
{
apr_pollset_t *pollset = (apr_pollset_t *) p_;
close(pollset->port_fd);
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_pollset_create(apr_pollset_t **pollset,
apr_uint32_t size,
apr_pool_t *p,
apr_uint32_t flags)
{
apr_status_t rv = APR_SUCCESS;
*pollset = apr_palloc(p, sizeof(**pollset));
#if APR_HAS_THREADS
if (flags & APR_POLLSET_THREADSAFE &&
((rv = apr_thread_mutex_create(&(*pollset)->ring_lock,
APR_THREAD_MUTEX_DEFAULT,
p) != APR_SUCCESS))) {
*pollset = NULL;
return rv;
}
#else
if (flags & APR_POLLSET_THREADSAFE) {
*pollset = NULL;
return APR_ENOTIMPL;
}
#endif
(*pollset)->nelts = 0;
(*pollset)->nalloc = size;
(*pollset)->flags = flags;
(*pollset)->pool = p;
(*pollset)->port_set = apr_palloc(p, size * sizeof(port_event_t));
(*pollset)->port_fd = port_create();
if ((*pollset)->port_fd < 0) {
return APR_ENOMEM;
}
apr_pool_cleanup_register(p, (void *) (*pollset), backend_cleanup,
apr_pool_cleanup_null);
(*pollset)->result_set = apr_palloc(p, size * sizeof(apr_pollfd_t));
APR_RING_INIT(&(*pollset)->query_ring, pfd_elem_t, link);
APR_RING_INIT(&(*pollset)->add_ring, pfd_elem_t, link);
APR_RING_INIT(&(*pollset)->free_ring, pfd_elem_t, link);
APR_RING_INIT(&(*pollset)->dead_ring, pfd_elem_t, link);
return rv;
}
APR_DECLARE(apr_status_t) apr_pollset_destroy(apr_pollset_t *pollset)
{
return apr_pool_cleanup_run(pollset->pool, pollset, backend_cleanup);
}
APR_DECLARE(apr_status_t) apr_pollset_add(apr_pollset_t *pollset,
const apr_pollfd_t *descriptor)
{
apr_os_sock_t fd;
pfd_elem_t *elem;
int res;
apr_status_t rv = APR_SUCCESS;
pollset_lock_rings();
if (!APR_RING_EMPTY(&(pollset->free_ring), pfd_elem_t, link)) {
elem = APR_RING_FIRST(&(pollset->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;
}
res = port_associate(pollset->port_fd, PORT_SOURCE_FD, fd,
get_event(descriptor->reqevents), (void *)elem);
if (res < 0) {
rv = APR_ENOMEM;
APR_RING_INSERT_TAIL(&(pollset->free_ring), elem, pfd_elem_t, link);
}
else {
pollset->nelts++;
APR_RING_INSERT_TAIL(&(pollset->query_ring), elem, pfd_elem_t, link);
}
pollset_unlock_rings();
return rv;
}
APR_DECLARE(apr_status_t) apr_pollset_remove(apr_pollset_t *pollset,
const apr_pollfd_t *descriptor)
{
apr_os_sock_t fd;
pfd_elem_t *ep;
apr_status_t rv = APR_SUCCESS;
int res;
pollset_lock_rings();
if (descriptor->desc_type == APR_POLL_SOCKET) {
fd = descriptor->desc.s->socketdes;
}
else {
fd = descriptor->desc.f->filedes;
}
res = port_dissociate(pollset->port_fd, PORT_SOURCE_FD, fd);
if (res < 0) {
rv = APR_NOTFOUND;
}
if (!APR_RING_EMPTY(&(pollset->query_ring), pfd_elem_t, link)) {
for (ep = APR_RING_FIRST(&(pollset->query_ring));
ep != APR_RING_SENTINEL(&(pollset->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->dead_ring),
ep, pfd_elem_t, link);
break;
}
}
}
if (!APR_RING_EMPTY(&(pollset->add_ring), pfd_elem_t, link)) {
for (ep = APR_RING_FIRST(&(pollset->add_ring));
ep != APR_RING_SENTINEL(&(pollset->add_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->dead_ring),
ep, pfd_elem_t, link);
break;
}
}
}
pollset_unlock_rings();
return rv;
}
APR_DECLARE(apr_status_t) apr_pollset_poll(apr_pollset_t *pollset,
apr_interval_time_t timeout,
apr_int32_t *num,
const apr_pollfd_t **descriptors)
{
apr_os_sock_t fd;
int ret, i;
unsigned int nget;
pfd_elem_t *ep;
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_msec(timeout);
tvptr = &tv;
}
nget = 1;
pollset_lock_rings();
while (!APR_RING_EMPTY(&(pollset->add_ring), pfd_elem_t, link)) {
ep = APR_RING_FIRST(&(pollset->add_ring));
APR_RING_REMOVE(ep, link);
if (ep->pfd.desc_type == APR_POLL_SOCKET) {
fd = ep->pfd.desc.s->socketdes;
}
else {
fd = ep->pfd.desc.f->filedes;
}
port_associate(pollset->port_fd, PORT_SOURCE_FD,
fd, get_event(ep->pfd.reqevents), ep);
}
pollset_unlock_rings();
ret = port_getn(pollset->port_fd, pollset->port_set, pollset->nalloc,
&nget, tvptr);
(*num) = nget;
if (ret == -1) {
(*num) = 0;
if (errno == ETIME || errno == EINTR) {
rv = APR_TIMEUP;
}
else {
rv = APR_EGENERAL;
}
}
else if (nget == 0) {
rv = APR_TIMEUP;
}
else {
pollset_lock_rings();
for (i = 0; i < nget; i++) {
pollset->result_set[i] =
(((pfd_elem_t*)(pollset->port_set[i].portev_user))->pfd);
pollset->result_set[i].rtnevents =
get_revent(pollset->port_set[i].portev_events);
APR_RING_INSERT_TAIL(&(pollset->add_ring),
(pfd_elem_t*)pollset->port_set[i].portev_user,
pfd_elem_t, link);
}
pollset_unlock_rings();
if (descriptors) {
*descriptors = pollset->result_set;
}
}
pollset_lock_rings();
/* Shift all PFDs in the Dead Ring to be Free Ring */
APR_RING_CONCAT(&(pollset->free_ring), &(pollset->dead_ring), pfd_elem_t, link);
pollset_unlock_rings();
return rv;
}
#endif /* POLLSET_USES_PORT */
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