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Diffstat (limited to '')
| -rw-r--r-- | poll/unix/kqueue.c | 505 |
1 files changed, 505 insertions, 0 deletions
diff --git a/poll/unix/kqueue.c b/poll/unix/kqueue.c new file mode 100644 index 0000000..548464d --- /dev/null +++ b/poll/unix/kqueue.c @@ -0,0 +1,505 @@ +/* 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) { + rv = errno; + close(pollset->p->kqueue_fd); + pollset->p = NULL; + return rv; + } + + flags |= FD_CLOEXEC; + if (fcntl(pollset->p->kqueue_fd, F_SETFD, flags) == -1) { + rv = errno; + close(pollset->p->kqueue_fd); + pollset->p = NULL; + return rv; + } + } + + 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; + struct timespec tv, *tvptr; + apr_status_t rv = APR_SUCCESS; + + *num = 0; + + 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); + if (ret < 0) { + rv = apr_get_netos_error(); + } + else if (ret == 0) { + rv = APR_TIMEUP; + } + else { + int i, j; + const apr_pollfd_t *fd; + + 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_poll_drain_wakeup_pipe(pollset->wakeup_pipe); + 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 const apr_pollset_provider_t impl = { + impl_pollset_create, + impl_pollset_add, + impl_pollset_remove, + impl_pollset_poll, + impl_pollset_cleanup, + "kqueue" +}; + +const apr_pollset_provider_t *apr_pollset_provider_kqueue = &impl; + +static apr_status_t impl_pollcb_cleanup(apr_pollcb_t *pollcb) +{ + 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; + apr_status_t rv; + + if ((flags = fcntl(fd, F_GETFD)) == -1) { + rv = errno; + close(fd); + pollcb->fd = -1; + return rv; + } + + flags |= FD_CLOEXEC; + if (fcntl(fd, F_SETFD, flags) == -1) { + rv = errno; + close(fd); + pollcb->fd = -1; + return rv; + } + } + + pollcb->fd = fd; + pollcb->pollset.ke = (struct kevent *) apr_pcalloc(p, 2 * size * sizeof(struct kevent)); + + 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); + + if ((pollcb->flags & APR_POLLSET_WAKEABLE) && + pollfd->desc_type == APR_POLL_FILE && + pollfd->desc.f == pollcb->wakeup_pipe[0]) { + apr_poll_drain_wakeup_pipe(pollcb->wakeup_pipe); + return APR_EINTR; + } + + 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 const apr_pollcb_provider_t impl_cb = { + impl_pollcb_create, + impl_pollcb_add, + impl_pollcb_remove, + impl_pollcb_poll, + impl_pollcb_cleanup, + "kqueue" +}; + +const apr_pollcb_provider_t *apr_pollcb_provider_kqueue = &impl_cb; + +#endif /* HAVE_KQUEUE */ |