diff options
Diffstat (limited to 'poll/unix/port.c')
| -rw-r--r-- | poll/unix/port.c | 577 |
1 files changed, 577 insertions, 0 deletions
diff --git a/poll/unix/port.c b/poll/unix/port.c new file mode 100644 index 0000000..7a31c46 --- /dev/null +++ b/poll/unix/port.c @@ -0,0 +1,577 @@ +/* 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_atomic.h" +#include "apr_arch_file_io.h" +#include "apr_arch_networkio.h" +#include "apr_arch_poll_private.h" +#include "apr_arch_inherit.h" + +#if defined(HAVE_PORT_CREATE) + +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; + /* POLLERR, POLLHUP, and POLLNVAL aren't valid as requested events */ + + 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_private_t +{ + int port_fd; + port_event_t *port_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 containing the pollfd_t that will be added on the + * next call to apr_pollset_poll(). + */ + 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; + /* number of threads in poll */ + volatile apr_uint32_t waiting; +}; + +static apr_status_t call_port_getn(int port, port_event_t list[], + unsigned int max, unsigned int *nget, + apr_interval_time_t timeout) +{ + struct timespec tv, *tvptr; + int ret; + 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; + } + + list[0].portev_user = (void *)-1; /* so we can double check that an + * event was returned + */ + + ret = port_getn(port, list, max, nget, tvptr); + /* Note: 32-bit port_getn() on Solaris 10 x86 returns large negative + * values instead of 0 when returning immediately. + */ + + if (ret == -1) { + rv = apr_get_netos_error(); + + switch(rv) { + case EINTR: + case ETIME: + if (*nget > 0 && list[0].portev_user != (void *)-1) { + /* This confusing API can return an event at the same time + * that it reports EINTR or ETIME. If that occurs, just + * report the event. With EINTR, nget can be > 0 without + * any event, so check that portev_user was filled in. + * + * (Maybe it will be simplified; see thread + * http://mail.opensolaris.org + * /pipermail/networking-discuss/2009-August/011979.html + * This code will still work afterwards.) + */ + rv = APR_SUCCESS; + break; + } + if (rv == ETIME) { + rv = APR_TIMEUP; + } + /* fall-through */ + default: + *nget = 0; + } + } + else if (*nget == 0) { + rv = APR_TIMEUP; + } + + return rv; +} + +static apr_status_t impl_pollset_cleanup(apr_pollset_t *pollset) +{ + close(pollset->p->port_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 = APR_SUCCESS; + 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 + pollset->p->waiting = 0; + + pollset->p->port_set = apr_palloc(p, size * sizeof(port_event_t)); + + pollset->p->port_fd = port_create(); + + if (pollset->p->port_fd < 0) { + pollset->p = NULL; + return apr_get_netos_error(); + } + + { + int flags; + + if ((flags = fcntl(pollset->p->port_fd, F_GETFD)) == -1) + return errno; + + flags |= FD_CLOEXEC; + if (fcntl(pollset->p->port_fd, F_SETFD, flags) == -1) + return errno; + } + + pollset->p->result_set = apr_palloc(p, size * sizeof(apr_pollfd_t)); + + APR_RING_INIT(&pollset->p->query_ring, pfd_elem_t, link); + APR_RING_INIT(&pollset->p->add_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 rv; +} + +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; + int res; + 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->on_query_ring = 0; + } + elem->pfd = *descriptor; + + if (descriptor->desc_type == APR_POLL_SOCKET) { + fd = descriptor->desc.s->socketdes; + } + else { + fd = descriptor->desc.f->filedes; + } + + /* If another thread is polling, notify the kernel immediately; otherwise, + * wait until the next call to apr_pollset_poll(). + */ + if (apr_atomic_read32(&pollset->p->waiting)) { + res = port_associate(pollset->p->port_fd, PORT_SOURCE_FD, fd, + get_event(descriptor->reqevents), (void *)elem); + + if (res < 0) { + rv = apr_get_netos_error(); + APR_RING_INSERT_TAIL(&(pollset->p->free_ring), elem, pfd_elem_t, link); + } + else { + elem->on_query_ring = 1; + APR_RING_INSERT_TAIL(&(pollset->p->query_ring), elem, pfd_elem_t, link); + } + } + else { + APR_RING_INSERT_TAIL(&(pollset->p->add_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) +{ + apr_os_sock_t fd; + pfd_elem_t *ep; + apr_status_t rv = APR_SUCCESS; + int res; + int err = 0; + int found; + + pollset_lock_rings(); + + if (descriptor->desc_type == APR_POLL_SOCKET) { + fd = descriptor->desc.s->socketdes; + } + else { + fd = descriptor->desc.f->filedes; + } + + /* Search the add ring first. This ring is often shorter, + * and it often contains the descriptor being removed. + * (For the common scenario where apr_pollset_poll() + * returns activity for the descriptor and the descriptor + * is then removed from the pollset, it will have just + * been moved to the add ring by apr_pollset_poll().) + * + * If it is on the add ring, it isn't associated with the + * event port yet/anymore. + */ + found = 0; + for (ep = APR_RING_FIRST(&(pollset->p->add_ring)); + ep != APR_RING_SENTINEL(&(pollset->p->add_ring), + pfd_elem_t, link); + ep = APR_RING_NEXT(ep, link)) { + + if (descriptor->desc.s == ep->pfd.desc.s) { + found = 1; + APR_RING_REMOVE(ep, link); + APR_RING_INSERT_TAIL(&(pollset->p->free_ring), + ep, pfd_elem_t, link); + break; + } + } + + if (!found) { + res = port_dissociate(pollset->p->port_fd, PORT_SOURCE_FD, fd); + + if (res < 0) { + /* The expected case for this failure is that another + * thread's call to port_getn() returned this fd and + * disassociated the fd from the event port, and + * impl_pollset_poll() is blocked on the ring lock, + * which this thread holds. + */ + err = errno; + rv = APR_NOTFOUND; + } + + 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); + ep->on_query_ring = 0; + APR_RING_INSERT_TAIL(&(pollset->p->dead_ring), + ep, pfd_elem_t, link); + if (ENOENT == err) { + rv = APR_SUCCESS; + } + 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) +{ + apr_os_sock_t fd; + int ret, i, j; + unsigned int nget; + pfd_elem_t *ep; + apr_status_t rv = APR_SUCCESS; + apr_pollfd_t fp; + + nget = 1; + + pollset_lock_rings(); + + apr_atomic_inc32(&pollset->p->waiting); + + while (!APR_RING_EMPTY(&(pollset->p->add_ring), pfd_elem_t, link)) { + ep = APR_RING_FIRST(&(pollset->p->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; + } + + ret = port_associate(pollset->p->port_fd, PORT_SOURCE_FD, + fd, get_event(ep->pfd.reqevents), ep); + if (ret < 0) { + rv = apr_get_netos_error(); + APR_RING_INSERT_TAIL(&(pollset->p->free_ring), ep, pfd_elem_t, link); + break; + } + + ep->on_query_ring = 1; + APR_RING_INSERT_TAIL(&(pollset->p->query_ring), ep, pfd_elem_t, link); + } + + pollset_unlock_rings(); + + if (rv != APR_SUCCESS) { + apr_atomic_dec32(&pollset->p->waiting); + return rv; + } + + rv = call_port_getn(pollset->p->port_fd, pollset->p->port_set, + pollset->nalloc, &nget, timeout); + + /* decrease the waiting ASAP to reduce the window for calling + port_associate within apr_pollset_add() */ + apr_atomic_dec32(&pollset->p->waiting); + + (*num) = nget; + if (nget) { + + pollset_lock_rings(); + + for (i = 0, j = 0; i < nget; i++) { + fp = (((pfd_elem_t*)(pollset->p->port_set[i].portev_user))->pfd); + if ((pollset->flags & APR_POLLSET_WAKEABLE) && + fp.desc_type == APR_POLL_FILE && + fp.desc.f == pollset->wakeup_pipe[0]) { + apr_pollset_drain_wakeup_pipe(pollset); + rv = APR_EINTR; + } + else { + pollset->p->result_set[j] = fp; + pollset->p->result_set[j].rtnevents = + get_revent(pollset->p->port_set[i].portev_events); + + /* If the ring element is still on the query ring, move it + * to the add ring for re-association with the event port + * later. (It may have already been moved to the dead ring + * by a call to pollset_remove on another thread.) + */ + ep = (pfd_elem_t *)pollset->p->port_set[i].portev_user; + if (ep->on_query_ring) { + APR_RING_REMOVE(ep, link); + ep->on_query_ring = 0; + APR_RING_INSERT_TAIL(&(pollset->p->add_ring), ep, + pfd_elem_t, link); + } + j++; + } + } + pollset_unlock_rings(); + 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 apr_pollset_provider_t impl = { + impl_pollset_create, + impl_pollset_add, + impl_pollset_remove, + impl_pollset_poll, + impl_pollset_cleanup, + "port" +}; + +apr_pollset_provider_t *apr_pollset_provider_port = &impl; + +static apr_status_t cb_cleanup(void *p_) +{ + apr_pollcb_t *pollcb = (apr_pollcb_t *) p_; + 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) +{ + pollcb->fd = port_create(); + + if (pollcb->fd < 0) { + return apr_get_netos_error(); + } + + { + int flags; + + if ((flags = fcntl(pollcb->fd, F_GETFD)) == -1) + return errno; + + flags |= FD_CLOEXEC; + if (fcntl(pollcb->fd, F_SETFD, flags) == -1) + return errno; + } + + 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 */ |