| /* |
| * |
| * Copyright 2015, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #include <grpc/support/port_platform.h> |
| |
| #ifdef GPR_POSIX_MULTIPOLL_WITH_POLL |
| |
| #include "src/core/iomgr/pollset_posix.h" |
| |
| #include <errno.h> |
| #include <poll.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "src/core/iomgr/fd_posix.h" |
| #include "src/core/iomgr/iomgr_internal.h" |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/useful.h> |
| |
| typedef struct { |
| /* all polled fds */ |
| size_t fd_count; |
| size_t fd_capacity; |
| grpc_fd **fds; |
| /* fds being polled by the current poller: parallel arrays of pollfd, and |
| a grpc_fd_watcher */ |
| size_t pfd_count; |
| size_t pfd_capacity; |
| grpc_fd_watcher *watchers; |
| struct pollfd *pfds; |
| /* fds that have been removed from the pollset explicitly */ |
| size_t del_count; |
| size_t del_capacity; |
| grpc_fd **dels; |
| } pollset_hdr; |
| |
| static void multipoll_with_poll_pollset_add_fd(grpc_pollset *pollset, |
| grpc_fd *fd) { |
| size_t i; |
| pollset_hdr *h = pollset->data.ptr; |
| /* TODO(ctiller): this is O(num_fds^2); maybe switch to a hash set here */ |
| for (i = 0; i < h->fd_count; i++) { |
| if (h->fds[i] == fd) return; |
| } |
| if (h->fd_count == h->fd_capacity) { |
| h->fd_capacity = GPR_MAX(h->fd_capacity + 8, h->fd_count * 3 / 2); |
| h->fds = gpr_realloc(h->fds, sizeof(grpc_fd *) * h->fd_capacity); |
| } |
| h->fds[h->fd_count++] = fd; |
| grpc_fd_ref(fd); |
| } |
| |
| static void multipoll_with_poll_pollset_del_fd(grpc_pollset *pollset, |
| grpc_fd *fd) { |
| /* will get removed next poll cycle */ |
| pollset_hdr *h = pollset->data.ptr; |
| if (h->del_count == h->del_capacity) { |
| h->del_capacity = GPR_MAX(h->del_capacity + 8, h->del_count * 3 / 2); |
| h->dels = gpr_realloc(h->dels, sizeof(grpc_fd *) * h->del_capacity); |
| } |
| h->dels[h->del_count++] = fd; |
| grpc_fd_ref(fd); |
| } |
| |
| static void end_polling(grpc_pollset *pollset) { |
| size_t i; |
| pollset_hdr *h; |
| h = pollset->data.ptr; |
| for (i = 1; i < h->pfd_count; i++) { |
| grpc_fd_end_poll(&h->watchers[i]); |
| } |
| } |
| |
| static int multipoll_with_poll_pollset_maybe_work( |
| grpc_pollset *pollset, gpr_timespec deadline, gpr_timespec now, |
| int allow_synchronous_callback) { |
| int timeout; |
| int r; |
| size_t i, np, nf, nd; |
| pollset_hdr *h; |
| |
| if (pollset->counter) { |
| return 0; |
| } |
| h = pollset->data.ptr; |
| if (gpr_time_cmp(deadline, gpr_inf_future) == 0) { |
| timeout = -1; |
| } else { |
| timeout = gpr_time_to_millis(gpr_time_sub(deadline, now)); |
| if (timeout <= 0) { |
| return 1; |
| } |
| } |
| if (h->pfd_capacity < h->fd_count + 1) { |
| h->pfd_capacity = GPR_MAX(h->pfd_capacity * 3 / 2, h->fd_count + 1); |
| gpr_free(h->pfds); |
| gpr_free(h->watchers); |
| h->pfds = gpr_malloc(sizeof(struct pollfd) * h->pfd_capacity); |
| h->watchers = gpr_malloc(sizeof(grpc_fd_watcher) * h->pfd_capacity); |
| } |
| nf = 0; |
| np = 1; |
| h->pfds[0].fd = grpc_pollset_kick_pre_poll(&pollset->kick_state); |
| if (h->pfds[0].fd < 0) { |
| /* Already kicked */ |
| return 1; |
| } |
| h->pfds[0].events = POLLIN; |
| h->pfds[0].revents = POLLOUT; |
| for (i = 0; i < h->fd_count; i++) { |
| int remove = grpc_fd_is_orphaned(h->fds[i]); |
| for (nd = 0; nd < h->del_count; nd++) { |
| if (h->fds[i] == h->dels[nd]) remove = 1; |
| } |
| if (remove) { |
| grpc_fd_unref(h->fds[i]); |
| } else { |
| h->fds[nf++] = h->fds[i]; |
| h->watchers[np].fd = h->fds[i]; |
| h->pfds[np].fd = h->fds[i]->fd; |
| h->pfds[np].revents = 0; |
| np++; |
| } |
| } |
| h->pfd_count = np; |
| h->fd_count = nf; |
| for (nd = 0; nd < h->del_count; nd++) { |
| grpc_fd_unref(h->dels[nd]); |
| } |
| h->del_count = 0; |
| if (h->pfd_count == 0) { |
| end_polling(pollset); |
| return 0; |
| } |
| pollset->counter = 1; |
| gpr_mu_unlock(&pollset->mu); |
| |
| for (i = 1; i < np; i++) { |
| h->pfds[i].events = grpc_fd_begin_poll(h->watchers[i].fd, pollset, POLLIN, |
| POLLOUT, &h->watchers[i]); |
| } |
| |
| r = poll(h->pfds, h->pfd_count, timeout); |
| |
| end_polling(pollset); |
| |
| if (r < 0) { |
| if (errno != EINTR) { |
| gpr_log(GPR_ERROR, "poll() failed: %s", strerror(errno)); |
| } |
| } else if (r == 0) { |
| /* do nothing */ |
| } else { |
| if (h->pfds[0].revents & POLLIN) { |
| grpc_pollset_kick_consume(&pollset->kick_state); |
| } |
| for (i = 1; i < np; i++) { |
| if (h->pfds[i].revents & (POLLIN | POLLHUP | POLLERR)) { |
| grpc_fd_become_readable(h->watchers[i].fd, allow_synchronous_callback); |
| } |
| if (h->pfds[i].revents & (POLLOUT | POLLHUP | POLLERR)) { |
| grpc_fd_become_writable(h->watchers[i].fd, allow_synchronous_callback); |
| } |
| } |
| } |
| grpc_pollset_kick_post_poll(&pollset->kick_state); |
| |
| gpr_mu_lock(&pollset->mu); |
| pollset->counter = 0; |
| gpr_cv_broadcast(&pollset->cv); |
| return 1; |
| } |
| |
| static void multipoll_with_poll_pollset_kick(grpc_pollset *p) { |
| grpc_pollset_force_kick(p); |
| } |
| |
| static void multipoll_with_poll_pollset_destroy(grpc_pollset *pollset) { |
| size_t i; |
| pollset_hdr *h = pollset->data.ptr; |
| GPR_ASSERT(pollset->counter == 0); |
| for (i = 0; i < h->fd_count; i++) { |
| grpc_fd_unref(h->fds[i]); |
| } |
| for (i = 0; i < h->del_count; i++) { |
| grpc_fd_unref(h->dels[i]); |
| } |
| gpr_free(h->pfds); |
| gpr_free(h->watchers); |
| gpr_free(h->fds); |
| gpr_free(h->dels); |
| gpr_free(h); |
| } |
| |
| static const grpc_pollset_vtable multipoll_with_poll_pollset = { |
| multipoll_with_poll_pollset_add_fd, multipoll_with_poll_pollset_del_fd, |
| multipoll_with_poll_pollset_maybe_work, multipoll_with_poll_pollset_kick, |
| multipoll_with_poll_pollset_destroy}; |
| |
| void grpc_platform_become_multipoller(grpc_pollset *pollset, grpc_fd **fds, |
| size_t nfds) { |
| size_t i; |
| pollset_hdr *h = gpr_malloc(sizeof(pollset_hdr)); |
| pollset->vtable = &multipoll_with_poll_pollset; |
| pollset->data.ptr = h; |
| h->fd_count = nfds; |
| h->fd_capacity = nfds; |
| h->fds = gpr_malloc(nfds * sizeof(grpc_fd *)); |
| h->pfd_count = 0; |
| h->pfd_capacity = 0; |
| h->pfds = NULL; |
| h->watchers = NULL; |
| h->del_count = 0; |
| h->del_capacity = 0; |
| h->dels = NULL; |
| for (i = 0; i < nfds; i++) { |
| h->fds[i] = fds[i]; |
| grpc_fd_ref(fds[i]); |
| } |
| } |
| |
| #endif |