595 lines
17 KiB
C
595 lines
17 KiB
C
/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "apr.h"
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#include "apr_poll.h"
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#include "apr_time.h"
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#include "apr_portable.h"
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#include "apr_atomic.h"
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#include "apr_arch_file_io.h"
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#include "apr_arch_networkio.h"
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#include "apr_arch_poll_private.h"
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#include "apr_arch_inherit.h"
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#if defined(HAVE_PORT_CREATE)
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static apr_int16_t get_event(apr_int16_t event)
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{
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apr_int16_t rv = 0;
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if (event & APR_POLLIN)
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rv |= POLLIN;
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if (event & APR_POLLPRI)
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rv |= POLLPRI;
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if (event & APR_POLLOUT)
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rv |= POLLOUT;
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/* POLLERR, POLLHUP, and POLLNVAL aren't valid as requested events */
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return rv;
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}
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static apr_int16_t get_revent(apr_int16_t event)
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{
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apr_int16_t rv = 0;
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if (event & POLLIN)
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rv |= APR_POLLIN;
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if (event & POLLPRI)
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rv |= APR_POLLPRI;
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if (event & POLLOUT)
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rv |= APR_POLLOUT;
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if (event & POLLERR)
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rv |= APR_POLLERR;
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if (event & POLLHUP)
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rv |= APR_POLLHUP;
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if (event & POLLNVAL)
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rv |= APR_POLLNVAL;
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return rv;
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}
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struct apr_pollset_private_t
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{
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int port_fd;
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port_event_t *port_set;
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apr_pollfd_t *result_set;
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#if APR_HAS_THREADS
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/* A thread mutex to protect operations on the rings */
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apr_thread_mutex_t *ring_lock;
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#endif
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/* A ring containing all of the pollfd_t that are active */
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APR_RING_HEAD(pfd_query_ring_t, pfd_elem_t) query_ring;
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/* A ring containing the pollfd_t that will be added on the
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* next call to apr_pollset_poll().
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*/
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APR_RING_HEAD(pfd_add_ring_t, pfd_elem_t) add_ring;
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/* A ring of pollfd_t that have been used, and then _remove'd */
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APR_RING_HEAD(pfd_free_ring_t, pfd_elem_t) free_ring;
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/* A ring of pollfd_t where rings that have been _remove'd but
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might still be inside a _poll */
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APR_RING_HEAD(pfd_dead_ring_t, pfd_elem_t) dead_ring;
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/* number of threads in poll */
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volatile apr_uint32_t waiting;
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};
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static apr_status_t call_port_getn(int port, port_event_t list[],
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unsigned int max, unsigned int *nget,
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apr_interval_time_t timeout)
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{
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struct timespec tv, *tvptr;
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int ret;
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apr_status_t rv = APR_SUCCESS;
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if (timeout < 0) {
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tvptr = NULL;
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}
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else {
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tv.tv_sec = (long) apr_time_sec(timeout);
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tv.tv_nsec = (long) apr_time_usec(timeout) * 1000;
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tvptr = &tv;
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}
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list[0].portev_user = (void *)-1; /* so we can double check that an
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* event was returned
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*/
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ret = port_getn(port, list, max, nget, tvptr);
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/* Note: 32-bit port_getn() on Solaris 10 x86 returns large negative
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* values instead of 0 when returning immediately.
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*/
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if (ret == -1) {
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rv = apr_get_netos_error();
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switch(rv) {
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case EINTR:
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case ETIME:
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if (*nget > 0 && list[0].portev_user != (void *)-1) {
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/* This confusing API can return an event at the same time
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* that it reports EINTR or ETIME. If that occurs, just
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* report the event. With EINTR, nget can be > 0 without
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* any event, so check that portev_user was filled in.
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*
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* (Maybe it will be simplified; see thread
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* http://mail.opensolaris.org
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* /pipermail/networking-discuss/2009-August/011979.html
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* This code will still work afterwards.)
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*/
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rv = APR_SUCCESS;
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break;
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}
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if (rv == ETIME) {
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rv = APR_TIMEUP;
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}
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/* fall-through */
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default:
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*nget = 0;
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}
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}
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else if (*nget == 0) {
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rv = APR_TIMEUP;
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}
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return rv;
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}
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static apr_status_t impl_pollset_cleanup(apr_pollset_t *pollset)
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{
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close(pollset->p->port_fd);
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return APR_SUCCESS;
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}
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static apr_status_t impl_pollset_create(apr_pollset_t *pollset,
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apr_uint32_t size,
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apr_pool_t *p,
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apr_uint32_t flags)
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{
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apr_status_t rv = APR_SUCCESS;
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pollset->p = apr_palloc(p, sizeof(apr_pollset_private_t));
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#if APR_HAS_THREADS
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if (flags & APR_POLLSET_THREADSAFE &&
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((rv = apr_thread_mutex_create(&pollset->p->ring_lock,
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APR_THREAD_MUTEX_DEFAULT,
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p)) != APR_SUCCESS)) {
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pollset->p = NULL;
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return rv;
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}
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#else
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if (flags & APR_POLLSET_THREADSAFE) {
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pollset->p = NULL;
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return APR_ENOTIMPL;
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}
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#endif
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pollset->p->waiting = 0;
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pollset->p->port_set = apr_palloc(p, size * sizeof(port_event_t));
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pollset->p->port_fd = port_create();
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if (pollset->p->port_fd < 0) {
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pollset->p = NULL;
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return apr_get_netos_error();
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}
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{
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int flags;
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if ((flags = fcntl(pollset->p->port_fd, F_GETFD)) == -1) {
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rv = errno;
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close(pollset->p->port_fd);
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pollset->p = NULL;
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return rv;
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}
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flags |= FD_CLOEXEC;
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if (fcntl(pollset->p->port_fd, F_SETFD, flags) == -1) {
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rv = errno;
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close(pollset->p->port_fd);
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pollset->p = NULL;
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return rv;
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}
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}
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pollset->p->result_set = apr_palloc(p, size * sizeof(apr_pollfd_t));
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APR_RING_INIT(&pollset->p->query_ring, pfd_elem_t, link);
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APR_RING_INIT(&pollset->p->add_ring, pfd_elem_t, link);
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APR_RING_INIT(&pollset->p->free_ring, pfd_elem_t, link);
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APR_RING_INIT(&pollset->p->dead_ring, pfd_elem_t, link);
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return rv;
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}
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static apr_status_t impl_pollset_add(apr_pollset_t *pollset,
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const apr_pollfd_t *descriptor)
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{
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apr_os_sock_t fd;
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pfd_elem_t *elem;
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int res;
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apr_status_t rv = APR_SUCCESS;
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pollset_lock_rings();
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if (!APR_RING_EMPTY(&(pollset->p->free_ring), pfd_elem_t, link)) {
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elem = APR_RING_FIRST(&(pollset->p->free_ring));
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APR_RING_REMOVE(elem, link);
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}
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else {
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elem = (pfd_elem_t *) apr_palloc(pollset->pool, sizeof(pfd_elem_t));
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APR_RING_ELEM_INIT(elem, link);
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elem->on_query_ring = 0;
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}
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elem->pfd = *descriptor;
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if (descriptor->desc_type == APR_POLL_SOCKET) {
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fd = descriptor->desc.s->socketdes;
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}
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else {
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fd = descriptor->desc.f->filedes;
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}
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/* If another thread is polling, notify the kernel immediately; otherwise,
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* wait until the next call to apr_pollset_poll().
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*/
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if (apr_atomic_read32(&pollset->p->waiting)) {
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res = port_associate(pollset->p->port_fd, PORT_SOURCE_FD, fd,
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get_event(descriptor->reqevents), (void *)elem);
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if (res < 0) {
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rv = apr_get_netos_error();
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APR_RING_INSERT_TAIL(&(pollset->p->free_ring), elem, pfd_elem_t, link);
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}
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else {
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elem->on_query_ring = 1;
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APR_RING_INSERT_TAIL(&(pollset->p->query_ring), elem, pfd_elem_t, link);
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}
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}
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else {
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APR_RING_INSERT_TAIL(&(pollset->p->add_ring), elem, pfd_elem_t, link);
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}
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pollset_unlock_rings();
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return rv;
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}
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static apr_status_t impl_pollset_remove(apr_pollset_t *pollset,
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const apr_pollfd_t *descriptor)
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{
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apr_os_sock_t fd;
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pfd_elem_t *ep;
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apr_status_t rv = APR_SUCCESS;
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int res;
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int err = 0;
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int found;
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pollset_lock_rings();
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if (descriptor->desc_type == APR_POLL_SOCKET) {
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fd = descriptor->desc.s->socketdes;
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}
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else {
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fd = descriptor->desc.f->filedes;
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}
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/* Search the add ring first. This ring is often shorter,
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* and it often contains the descriptor being removed.
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* (For the common scenario where apr_pollset_poll()
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* returns activity for the descriptor and the descriptor
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* is then removed from the pollset, it will have just
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* been moved to the add ring by apr_pollset_poll().)
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*
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* If it is on the add ring, it isn't associated with the
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* event port yet/anymore.
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*/
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found = 0;
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for (ep = APR_RING_FIRST(&(pollset->p->add_ring));
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ep != APR_RING_SENTINEL(&(pollset->p->add_ring),
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pfd_elem_t, link);
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ep = APR_RING_NEXT(ep, link)) {
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if (descriptor->desc.s == ep->pfd.desc.s) {
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found = 1;
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APR_RING_REMOVE(ep, link);
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APR_RING_INSERT_TAIL(&(pollset->p->free_ring),
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ep, pfd_elem_t, link);
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break;
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}
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}
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if (!found) {
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res = port_dissociate(pollset->p->port_fd, PORT_SOURCE_FD, fd);
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if (res < 0) {
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/* The expected case for this failure is that another
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* thread's call to port_getn() returned this fd and
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* disassociated the fd from the event port, and
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* impl_pollset_poll() is blocked on the ring lock,
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* which this thread holds.
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*/
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err = errno;
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rv = APR_NOTFOUND;
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}
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for (ep = APR_RING_FIRST(&(pollset->p->query_ring));
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ep != APR_RING_SENTINEL(&(pollset->p->query_ring),
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pfd_elem_t, link);
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ep = APR_RING_NEXT(ep, link)) {
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if (descriptor->desc.s == ep->pfd.desc.s) {
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APR_RING_REMOVE(ep, link);
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ep->on_query_ring = 0;
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APR_RING_INSERT_TAIL(&(pollset->p->dead_ring),
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ep, pfd_elem_t, link);
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if (ENOENT == err) {
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rv = APR_SUCCESS;
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}
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break;
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}
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}
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}
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pollset_unlock_rings();
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return rv;
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}
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static apr_status_t impl_pollset_poll(apr_pollset_t *pollset,
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apr_interval_time_t timeout,
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apr_int32_t *num,
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const apr_pollfd_t **descriptors)
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{
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apr_os_sock_t fd;
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int ret, i, j;
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unsigned int nget;
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pfd_elem_t *ep;
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apr_status_t rv = APR_SUCCESS;
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apr_pollfd_t fp;
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nget = 1;
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pollset_lock_rings();
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apr_atomic_inc32(&pollset->p->waiting);
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while (!APR_RING_EMPTY(&(pollset->p->add_ring), pfd_elem_t, link)) {
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ep = APR_RING_FIRST(&(pollset->p->add_ring));
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APR_RING_REMOVE(ep, link);
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if (ep->pfd.desc_type == APR_POLL_SOCKET) {
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fd = ep->pfd.desc.s->socketdes;
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}
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else {
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fd = ep->pfd.desc.f->filedes;
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}
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ret = port_associate(pollset->p->port_fd, PORT_SOURCE_FD,
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fd, get_event(ep->pfd.reqevents), ep);
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if (ret < 0) {
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rv = apr_get_netos_error();
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APR_RING_INSERT_TAIL(&(pollset->p->free_ring), ep, pfd_elem_t, link);
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break;
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}
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ep->on_query_ring = 1;
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APR_RING_INSERT_TAIL(&(pollset->p->query_ring), ep, pfd_elem_t, link);
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}
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pollset_unlock_rings();
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if (rv != APR_SUCCESS) {
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apr_atomic_dec32(&pollset->p->waiting);
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return rv;
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}
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rv = call_port_getn(pollset->p->port_fd, pollset->p->port_set,
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pollset->nalloc, &nget, timeout);
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/* decrease the waiting ASAP to reduce the window for calling
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port_associate within apr_pollset_add() */
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apr_atomic_dec32(&pollset->p->waiting);
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(*num) = nget;
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if (nget) {
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pollset_lock_rings();
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for (i = 0, j = 0; i < nget; i++) {
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fp = (((pfd_elem_t*)(pollset->p->port_set[i].portev_user))->pfd);
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if ((pollset->flags & APR_POLLSET_WAKEABLE) &&
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fp.desc_type == APR_POLL_FILE &&
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fp.desc.f == pollset->wakeup_pipe[0]) {
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apr_pollset_drain_wakeup_pipe(pollset);
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rv = APR_EINTR;
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}
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else {
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pollset->p->result_set[j] = fp;
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pollset->p->result_set[j].rtnevents =
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get_revent(pollset->p->port_set[i].portev_events);
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/* If the ring element is still on the query ring, move it
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* to the add ring for re-association with the event port
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* later. (It may have already been moved to the dead ring
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* by a call to pollset_remove on another thread.)
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*/
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ep = (pfd_elem_t *)pollset->p->port_set[i].portev_user;
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if (ep->on_query_ring) {
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APR_RING_REMOVE(ep, link);
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ep->on_query_ring = 0;
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APR_RING_INSERT_TAIL(&(pollset->p->add_ring), ep,
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pfd_elem_t, link);
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}
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j++;
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}
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}
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pollset_unlock_rings();
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if ((*num = j)) { /* any event besides wakeup pipe? */
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rv = APR_SUCCESS;
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if (descriptors) {
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*descriptors = pollset->p->result_set;
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}
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}
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}
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pollset_lock_rings();
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/* Shift all PFDs in the Dead Ring to the Free Ring */
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APR_RING_CONCAT(&(pollset->p->free_ring), &(pollset->p->dead_ring), pfd_elem_t, link);
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pollset_unlock_rings();
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return rv;
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}
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static apr_pollset_provider_t impl = {
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impl_pollset_create,
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impl_pollset_add,
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impl_pollset_remove,
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impl_pollset_poll,
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impl_pollset_cleanup,
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"port"
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};
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apr_pollset_provider_t *apr_pollset_provider_port = &impl;
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static apr_status_t cb_cleanup(void *p_)
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{
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apr_pollcb_t *pollcb = (apr_pollcb_t *) p_;
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close(pollcb->fd);
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return APR_SUCCESS;
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}
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static apr_status_t impl_pollcb_create(apr_pollcb_t *pollcb,
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apr_uint32_t size,
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apr_pool_t *p,
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apr_uint32_t flags)
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{
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pollcb->fd = port_create();
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if (pollcb->fd < 0) {
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return apr_get_netos_error();
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}
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{
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int flags;
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apr_status_t rv;
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if ((flags = fcntl(pollcb->fd, F_GETFD)) == -1) {
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rv = errno;
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close(pollcb->fd);
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pollcb->fd = -1;
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return rv;
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}
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flags |= FD_CLOEXEC;
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if (fcntl(pollcb->fd, F_SETFD, flags) == -1) {
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rv = errno;
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close(pollcb->fd);
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pollcb->fd = -1;
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return rv;
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}
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}
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pollcb->pollset.port = apr_palloc(p, size * sizeof(port_event_t));
|
|
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)
|
|
{
|
|
int ret, fd;
|
|
|
|
if (descriptor->desc_type == APR_POLL_SOCKET) {
|
|
fd = descriptor->desc.s->socketdes;
|
|
}
|
|
else {
|
|
fd = descriptor->desc.f->filedes;
|
|
}
|
|
|
|
ret = port_associate(pollcb->fd, PORT_SOURCE_FD, fd,
|
|
get_event(descriptor->reqevents), descriptor);
|
|
|
|
if (ret == -1) {
|
|
return apr_get_netos_error();
|
|
}
|
|
|
|
return APR_SUCCESS;
|
|
}
|
|
|
|
static apr_status_t impl_pollcb_remove(apr_pollcb_t *pollcb,
|
|
apr_pollfd_t *descriptor)
|
|
{
|
|
int fd, ret;
|
|
|
|
if (descriptor->desc_type == APR_POLL_SOCKET) {
|
|
fd = descriptor->desc.s->socketdes;
|
|
}
|
|
else {
|
|
fd = descriptor->desc.f->filedes;
|
|
}
|
|
|
|
ret = port_dissociate(pollcb->fd, PORT_SOURCE_FD, fd);
|
|
|
|
if (ret < 0) {
|
|
return APR_NOTFOUND;
|
|
}
|
|
|
|
return APR_SUCCESS;
|
|
}
|
|
|
|
static apr_status_t impl_pollcb_poll(apr_pollcb_t *pollcb,
|
|
apr_interval_time_t timeout,
|
|
apr_pollcb_cb_t func,
|
|
void *baton)
|
|
{
|
|
apr_pollfd_t *pollfd;
|
|
apr_status_t rv;
|
|
unsigned int i, nget = 1;
|
|
|
|
rv = call_port_getn(pollcb->fd, pollcb->pollset.port, pollcb->nalloc,
|
|
&nget, timeout);
|
|
|
|
if (nget) {
|
|
for (i = 0; i < nget; i++) {
|
|
pollfd = (apr_pollfd_t *)(pollcb->pollset.port[i].portev_user);
|
|
pollfd->rtnevents = get_revent(pollcb->pollset.port[i].portev_events);
|
|
|
|
rv = func(baton, pollfd);
|
|
if (rv) {
|
|
return rv;
|
|
}
|
|
rv = apr_pollcb_add(pollcb, pollfd);
|
|
}
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
static apr_pollcb_provider_t impl_cb = {
|
|
impl_pollcb_create,
|
|
impl_pollcb_add,
|
|
impl_pollcb_remove,
|
|
impl_pollcb_poll,
|
|
"port"
|
|
};
|
|
|
|
apr_pollcb_provider_t *apr_pollcb_provider_port = &impl_cb;
|
|
|
|
#endif /* HAVE_PORT_CREATE */
|