| /* 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_arch_poll_private.h" |
| |
| #ifdef POLLSET_USES_EPOLL |
| |
| static apr_int16_t get_epoll_event(apr_int16_t event) |
| { |
| apr_int16_t rv = 0; |
| |
| if (event & APR_POLLIN) |
| rv |= EPOLLIN; |
| if (event & APR_POLLPRI) |
| rv |= EPOLLPRI; |
| if (event & APR_POLLOUT) |
| rv |= EPOLLOUT; |
| if (event & APR_POLLERR) |
| rv |= EPOLLERR; |
| if (event & APR_POLLHUP) |
| rv |= EPOLLHUP; |
| /* APR_POLLNVAL is not handled by epoll. */ |
| |
| return rv; |
| } |
| |
| static apr_int16_t get_epoll_revent(apr_int16_t event) |
| { |
| apr_int16_t rv = 0; |
| |
| if (event & EPOLLIN) |
| rv |= APR_POLLIN; |
| if (event & EPOLLPRI) |
| rv |= APR_POLLPRI; |
| if (event & EPOLLOUT) |
| rv |= APR_POLLOUT; |
| if (event & EPOLLERR) |
| rv |= APR_POLLERR; |
| if (event & EPOLLHUP) |
| rv |= APR_POLLHUP; |
| /* APR_POLLNVAL is not handled by epoll. */ |
| |
| return rv; |
| } |
| |
| struct apr_pollset_t |
| { |
| apr_pool_t *pool; |
| apr_uint32_t nelts; |
| apr_uint32_t nalloc; |
| int epoll_fd; |
| struct epoll_event *pollset; |
| 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; |
| /* 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()`ed 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->epoll_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; |
| int fd; |
| |
| fd = epoll_create(size); |
| if (fd < 0) { |
| *pollset = NULL; |
| return errno; |
| } |
| |
| *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)->epoll_fd = fd; |
| (*pollset)->pollset = apr_palloc(p, size * sizeof(struct epoll_event)); |
| apr_pool_cleanup_register(p, *pollset, backend_cleanup, backend_cleanup); |
| (*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)->free_ring, pfd_elem_t, link); |
| APR_RING_INIT(&(*pollset)->dead_ring, pfd_elem_t, link); |
| |
| return APR_SUCCESS; |
| } |
| |
| 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) |
| { |
| struct epoll_event ev; |
| int ret = -1; |
| pfd_elem_t *elem; |
| 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; |
| |
| ev.events = get_epoll_event(descriptor->reqevents); |
| ev.data.ptr = elem; |
| if (descriptor->desc_type == APR_POLL_SOCKET) { |
| ret = epoll_ctl(pollset->epoll_fd, EPOLL_CTL_ADD, |
| descriptor->desc.s->socketdes, &ev); |
| } |
| else { |
| ret = epoll_ctl(pollset->epoll_fd, EPOLL_CTL_ADD, |
| descriptor->desc.f->filedes, &ev); |
| } |
| |
| if (0 != ret) { |
| rv = APR_EBADF; |
| 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) |
| { |
| pfd_elem_t *ep; |
| apr_status_t rv = APR_SUCCESS; |
| struct epoll_event ev; |
| int ret = -1; |
| |
| pollset_lock_rings(); |
| |
| ev.events = get_epoll_event(descriptor->reqevents); |
| |
| if (descriptor->desc_type == APR_POLL_SOCKET) { |
| ret = epoll_ctl(pollset->epoll_fd, EPOLL_CTL_DEL, |
| descriptor->desc.s->socketdes, &ev); |
| } |
| else { |
| ret = epoll_ctl(pollset->epoll_fd, EPOLL_CTL_DEL, |
| descriptor->desc.f->filedes, &ev); |
| } |
| if (ret < 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; |
| } |
| } |
| } |
| |
| 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) |
| { |
| int ret, i; |
| apr_status_t rv = APR_SUCCESS; |
| |
| if (timeout > 0) { |
| timeout /= 1000; |
| } |
| |
| ret = epoll_wait(pollset->epoll_fd, pollset->pollset, pollset->nalloc, |
| timeout); |
| (*num) = ret; |
| |
| if (ret < 0) { |
| rv = apr_get_netos_error(); |
| } |
| else if (ret == 0) { |
| rv = APR_TIMEUP; |
| } |
| else { |
| for (i = 0; i < ret; i++) { |
| pollset->result_set[i] = |
| (((pfd_elem_t *) (pollset->pollset[i].data.ptr))->pfd); |
| pollset->result_set[i].rtnevents = |
| get_epoll_revent(pollset->pollset[i].events); |
| } |
| |
| 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_EPOLL */ |
