273 lines
7.8 KiB
C
273 lines
7.8 KiB
C
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/* 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_arch_poll_private.h"
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#ifdef POLLSET_USES_EPOLL
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static apr_int16_t get_epoll_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 |= EPOLLIN;
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if (event & APR_POLLPRI)
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rv |= EPOLLPRI;
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if (event & APR_POLLOUT)
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rv |= EPOLLOUT;
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if (event & APR_POLLERR)
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rv |= EPOLLERR;
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if (event & APR_POLLHUP)
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rv |= EPOLLHUP;
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/* APR_POLLNVAL is not handled by epoll. */
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return rv;
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}
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static apr_int16_t get_epoll_revent(apr_int16_t event)
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{
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apr_int16_t rv = 0;
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if (event & EPOLLIN)
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rv |= APR_POLLIN;
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if (event & EPOLLPRI)
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rv |= APR_POLLPRI;
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if (event & EPOLLOUT)
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rv |= APR_POLLOUT;
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if (event & EPOLLERR)
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rv |= APR_POLLERR;
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if (event & EPOLLHUP)
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rv |= APR_POLLHUP;
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/* APR_POLLNVAL is not handled by epoll. */
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return rv;
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}
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struct apr_pollset_t
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{
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apr_pool_t *pool;
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apr_uint32_t nelts;
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apr_uint32_t nalloc;
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int epoll_fd;
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struct epoll_event *pollset;
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apr_pollfd_t *result_set;
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apr_uint32_t flags;
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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 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()`ed 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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};
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static apr_status_t backend_cleanup(void *p_)
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{
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apr_pollset_t *pollset = (apr_pollset_t *) p_;
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close(pollset->epoll_fd);
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return APR_SUCCESS;
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}
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APR_DECLARE(apr_status_t) apr_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;
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int fd;
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fd = epoll_create(size);
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if (fd < 0) {
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*pollset = NULL;
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return errno;
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}
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*pollset = apr_palloc(p, sizeof(**pollset));
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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)->ring_lock,
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APR_THREAD_MUTEX_DEFAULT,
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p) != APR_SUCCESS))) {
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*pollset = 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 = NULL;
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return APR_ENOTIMPL;
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}
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#endif
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(*pollset)->nelts = 0;
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(*pollset)->nalloc = size;
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(*pollset)->flags = flags;
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(*pollset)->pool = p;
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(*pollset)->epoll_fd = fd;
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(*pollset)->pollset = apr_palloc(p, size * sizeof(struct epoll_event));
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apr_pool_cleanup_register(p, *pollset, backend_cleanup, backend_cleanup);
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(*pollset)->result_set = apr_palloc(p, size * sizeof(apr_pollfd_t));
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APR_RING_INIT(&(*pollset)->query_ring, pfd_elem_t, link);
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APR_RING_INIT(&(*pollset)->free_ring, pfd_elem_t, link);
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APR_RING_INIT(&(*pollset)->dead_ring, pfd_elem_t, link);
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return APR_SUCCESS;
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}
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APR_DECLARE(apr_status_t) apr_pollset_destroy(apr_pollset_t *pollset)
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{
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return apr_pool_cleanup_run(pollset->pool, pollset, backend_cleanup);
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}
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APR_DECLARE(apr_status_t) apr_pollset_add(apr_pollset_t *pollset,
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const apr_pollfd_t *descriptor)
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{
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struct epoll_event ev;
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int ret = -1;
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pfd_elem_t *elem;
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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->free_ring), pfd_elem_t, link)) {
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elem = APR_RING_FIRST(&(pollset->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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}
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elem->pfd = *descriptor;
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ev.events = get_epoll_event(descriptor->reqevents);
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ev.data.ptr = elem;
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if (descriptor->desc_type == APR_POLL_SOCKET) {
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ret = epoll_ctl(pollset->epoll_fd, EPOLL_CTL_ADD,
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descriptor->desc.s->socketdes, &ev);
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}
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else {
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ret = epoll_ctl(pollset->epoll_fd, EPOLL_CTL_ADD,
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descriptor->desc.f->filedes, &ev);
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}
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if (0 != ret) {
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rv = APR_EBADF;
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APR_RING_INSERT_TAIL(&(pollset->free_ring), elem, pfd_elem_t, link);
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}
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else {
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pollset->nelts++;
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APR_RING_INSERT_TAIL(&(pollset->query_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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APR_DECLARE(apr_status_t) apr_pollset_remove(apr_pollset_t *pollset,
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const apr_pollfd_t *descriptor)
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{
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pfd_elem_t *ep;
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apr_status_t rv = APR_SUCCESS;
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struct epoll_event ev;
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int ret = -1;
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pollset_lock_rings();
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ev.events = get_epoll_event(descriptor->reqevents);
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if (descriptor->desc_type == APR_POLL_SOCKET) {
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ret = epoll_ctl(pollset->epoll_fd, EPOLL_CTL_DEL,
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descriptor->desc.s->socketdes, &ev);
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}
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else {
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ret = epoll_ctl(pollset->epoll_fd, EPOLL_CTL_DEL,
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descriptor->desc.f->filedes, &ev);
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}
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if (ret < 0) {
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rv = APR_NOTFOUND;
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}
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if (!APR_RING_EMPTY(&(pollset->query_ring), pfd_elem_t, link)) {
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for (ep = APR_RING_FIRST(&(pollset->query_ring));
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ep != APR_RING_SENTINEL(&(pollset->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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APR_RING_INSERT_TAIL(&(pollset->dead_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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}
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pollset_unlock_rings();
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return rv;
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}
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APR_DECLARE(apr_status_t) apr_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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int ret, i;
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apr_status_t rv = APR_SUCCESS;
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if (timeout > 0) {
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timeout /= 1000;
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}
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ret = epoll_wait(pollset->epoll_fd, pollset->pollset, pollset->nalloc,
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timeout);
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(*num) = ret;
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if (ret < 0) {
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rv = apr_get_netos_error();
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}
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else if (ret == 0) {
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rv = APR_TIMEUP;
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}
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else {
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for (i = 0; i < ret; i++) {
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pollset->result_set[i] =
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(((pfd_elem_t *) (pollset->pollset[i].data.ptr))->pfd);
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pollset->result_set[i].rtnevents =
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get_epoll_revent(pollset->pollset[i].events);
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}
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if (descriptors) {
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*descriptors = pollset->result_set;
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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 be Free Ring */
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APR_RING_CONCAT(&(pollset->free_ring), &(pollset->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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#endif /* POLLSET_USES_EPOLL */
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