mirror of https://github.com/grpc/grpc.git
Craig Tiller
9 years ago
parent
062127e326
commit
1a969c86f4
24 changed files with 1191 additions and 1453 deletions
File diff suppressed because it is too large
Load Diff
@ -1,324 +0,0 @@ |
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/*
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* |
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* Copyright 2015-2016, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#include <grpc/support/port_platform.h> |
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#ifdef GPR_LINUX_MULTIPOLL_WITH_EPOLL |
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#include <errno.h> |
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#include <poll.h> |
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#include <string.h> |
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#include <sys/epoll.h> |
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#include <unistd.h> |
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#include <grpc/support/alloc.h> |
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#include <grpc/support/log.h> |
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#include <grpc/support/useful.h> |
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#include "src/core/iomgr/ev_posix.h" |
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#include "src/core/profiling/timers.h" |
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#include "src/core/support/block_annotate.h" |
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struct epoll_fd_list { |
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int *epoll_fds; |
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size_t count; |
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size_t capacity; |
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}; |
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static struct epoll_fd_list epoll_fd_global_list; |
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static gpr_once init_epoll_fd_list_mu = GPR_ONCE_INIT; |
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static gpr_mu epoll_fd_list_mu; |
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static void init_mu(void) { gpr_mu_init(&epoll_fd_list_mu); } |
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static void add_epoll_fd_to_global_list(int epoll_fd) { |
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gpr_once_init(&init_epoll_fd_list_mu, init_mu); |
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gpr_mu_lock(&epoll_fd_list_mu); |
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if (epoll_fd_global_list.count == epoll_fd_global_list.capacity) { |
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epoll_fd_global_list.capacity = |
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GPR_MAX((size_t)8, epoll_fd_global_list.capacity * 2); |
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epoll_fd_global_list.epoll_fds = |
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gpr_realloc(epoll_fd_global_list.epoll_fds, |
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epoll_fd_global_list.capacity * sizeof(int)); |
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} |
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epoll_fd_global_list.epoll_fds[epoll_fd_global_list.count++] = epoll_fd; |
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gpr_mu_unlock(&epoll_fd_list_mu); |
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} |
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static void remove_epoll_fd_from_global_list(int epoll_fd) { |
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gpr_mu_lock(&epoll_fd_list_mu); |
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GPR_ASSERT(epoll_fd_global_list.count > 0); |
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for (size_t i = 0; i < epoll_fd_global_list.count; i++) { |
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if (epoll_fd == epoll_fd_global_list.epoll_fds[i]) { |
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epoll_fd_global_list.epoll_fds[i] = |
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epoll_fd_global_list.epoll_fds[--(epoll_fd_global_list.count)]; |
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break; |
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} |
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} |
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gpr_mu_unlock(&epoll_fd_list_mu); |
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} |
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void grpc_remove_fd_from_all_epoll_sets(int fd) { |
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int err; |
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gpr_once_init(&init_epoll_fd_list_mu, init_mu); |
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gpr_mu_lock(&epoll_fd_list_mu); |
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if (epoll_fd_global_list.count == 0) { |
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gpr_mu_unlock(&epoll_fd_list_mu); |
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return; |
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} |
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for (size_t i = 0; i < epoll_fd_global_list.count; i++) { |
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err = epoll_ctl(epoll_fd_global_list.epoll_fds[i], EPOLL_CTL_DEL, fd, NULL); |
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if (err < 0 && errno != ENOENT) { |
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gpr_log(GPR_ERROR, "epoll_ctl del for %d failed: %s", fd, |
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strerror(errno)); |
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} |
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} |
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gpr_mu_unlock(&epoll_fd_list_mu); |
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} |
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typedef struct { |
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grpc_pollset *pollset; |
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grpc_fd *fd; |
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grpc_closure closure; |
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} delayed_add; |
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typedef struct { int epoll_fd; } pollset_hdr; |
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static void finally_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
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grpc_fd *fd) { |
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pollset_hdr *h = pollset->data.ptr; |
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struct epoll_event ev; |
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int err; |
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grpc_fd_watcher watcher; |
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/* We pretend to be polling whilst adding an fd to keep the fd from being
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closed during the add. This may result in a spurious wakeup being assigned |
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to this pollset whilst adding, but that should be benign. */ |
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GPR_ASSERT(grpc_fd_begin_poll(fd, pollset, NULL, 0, 0, &watcher) == 0); |
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if (watcher.fd != NULL) { |
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ev.events = (uint32_t)(EPOLLIN | EPOLLOUT | EPOLLET); |
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ev.data.ptr = fd; |
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err = epoll_ctl(h->epoll_fd, EPOLL_CTL_ADD, fd->fd, &ev); |
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if (err < 0) { |
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/* FDs may be added to a pollset multiple times, so EEXIST is normal. */ |
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if (errno != EEXIST) { |
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gpr_log(GPR_ERROR, "epoll_ctl add for %d failed: %s", fd->fd, |
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strerror(errno)); |
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} |
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} |
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} |
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grpc_fd_end_poll(exec_ctx, &watcher, 0, 0); |
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} |
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static void perform_delayed_add(grpc_exec_ctx *exec_ctx, void *arg, |
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bool iomgr_status) { |
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delayed_add *da = arg; |
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if (!grpc_fd_is_orphaned(da->fd)) { |
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finally_add_fd(exec_ctx, da->pollset, da->fd); |
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} |
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gpr_mu_lock(da->pollset->mu); |
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da->pollset->in_flight_cbs--; |
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if (da->pollset->shutting_down) { |
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/* We don't care about this pollset anymore. */ |
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if (da->pollset->in_flight_cbs == 0 && !da->pollset->called_shutdown) { |
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da->pollset->called_shutdown = 1; |
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grpc_exec_ctx_enqueue(exec_ctx, da->pollset->shutdown_done, true, NULL); |
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} |
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} |
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gpr_mu_unlock(da->pollset->mu); |
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GRPC_FD_UNREF(da->fd, "delayed_add"); |
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gpr_free(da); |
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} |
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static void multipoll_with_epoll_pollset_add_fd(grpc_exec_ctx *exec_ctx, |
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grpc_pollset *pollset, |
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grpc_fd *fd, |
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int and_unlock_pollset) { |
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if (and_unlock_pollset) { |
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gpr_mu_unlock(pollset->mu); |
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finally_add_fd(exec_ctx, pollset, fd); |
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} else { |
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delayed_add *da = gpr_malloc(sizeof(*da)); |
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da->pollset = pollset; |
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da->fd = fd; |
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GRPC_FD_REF(fd, "delayed_add"); |
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grpc_closure_init(&da->closure, perform_delayed_add, da); |
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pollset->in_flight_cbs++; |
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grpc_exec_ctx_enqueue(exec_ctx, &da->closure, true, NULL); |
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} |
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} |
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/* TODO(klempner): We probably want to turn this down a bit */ |
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#define GRPC_EPOLL_MAX_EVENTS 1000 |
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static void multipoll_with_epoll_pollset_maybe_work_and_unlock( |
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grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, grpc_pollset_worker *worker, |
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gpr_timespec deadline, gpr_timespec now) { |
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struct epoll_event ep_ev[GRPC_EPOLL_MAX_EVENTS]; |
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int ep_rv; |
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int poll_rv; |
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pollset_hdr *h = pollset->data.ptr; |
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int timeout_ms; |
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struct pollfd pfds[2]; |
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/* If you want to ignore epoll's ability to sanely handle parallel pollers,
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* for a more apples-to-apples performance comparison with poll, add a |
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* if (pollset->counter != 0) { return 0; } |
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* here. |
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*/ |
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gpr_mu_unlock(pollset->mu); |
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timeout_ms = grpc_poll_deadline_to_millis_timeout(deadline, now); |
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pfds[0].fd = GRPC_WAKEUP_FD_GET_READ_FD(&worker->wakeup_fd->fd); |
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pfds[0].events = POLLIN; |
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pfds[0].revents = 0; |
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pfds[1].fd = h->epoll_fd; |
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pfds[1].events = POLLIN; |
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pfds[1].revents = 0; |
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/* TODO(vpai): Consider first doing a 0 timeout poll here to avoid
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even going into the blocking annotation if possible */ |
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GPR_TIMER_BEGIN("poll", 0); |
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GRPC_SCHEDULING_START_BLOCKING_REGION; |
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poll_rv = grpc_poll_function(pfds, 2, timeout_ms); |
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GRPC_SCHEDULING_END_BLOCKING_REGION; |
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GPR_TIMER_END("poll", 0); |
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if (poll_rv < 0) { |
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if (errno != EINTR) { |
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gpr_log(GPR_ERROR, "poll() failed: %s", strerror(errno)); |
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} |
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} else if (poll_rv == 0) { |
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/* do nothing */ |
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} else { |
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if (pfds[0].revents) { |
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grpc_wakeup_fd_consume_wakeup(&worker->wakeup_fd->fd); |
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} |
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if (pfds[1].revents) { |
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do { |
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/* The following epoll_wait never blocks; it has a timeout of 0 */ |
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ep_rv = epoll_wait(h->epoll_fd, ep_ev, GRPC_EPOLL_MAX_EVENTS, 0); |
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if (ep_rv < 0) { |
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if (errno != EINTR) { |
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gpr_log(GPR_ERROR, "epoll_wait() failed: %s", strerror(errno)); |
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} |
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} else { |
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int i; |
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for (i = 0; i < ep_rv; ++i) { |
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grpc_fd *fd = ep_ev[i].data.ptr; |
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/* TODO(klempner): We might want to consider making err and pri
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* separate events */ |
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int cancel = ep_ev[i].events & (EPOLLERR | EPOLLHUP); |
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int read_ev = ep_ev[i].events & (EPOLLIN | EPOLLPRI); |
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int write_ev = ep_ev[i].events & EPOLLOUT; |
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if (fd == NULL) { |
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grpc_wakeup_fd_consume_wakeup(&grpc_global_wakeup_fd); |
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} else { |
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if (read_ev || cancel) { |
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grpc_fd_become_readable(exec_ctx, fd); |
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} |
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if (write_ev || cancel) { |
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grpc_fd_become_writable(exec_ctx, fd); |
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} |
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} |
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} |
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} |
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} while (ep_rv == GRPC_EPOLL_MAX_EVENTS); |
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} |
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} |
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} |
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static void multipoll_with_epoll_pollset_finish_shutdown( |
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grpc_pollset *pollset) {} |
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static void multipoll_with_epoll_pollset_destroy(grpc_pollset *pollset) { |
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pollset_hdr *h = pollset->data.ptr; |
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close(h->epoll_fd); |
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remove_epoll_fd_from_global_list(h->epoll_fd); |
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gpr_free(h); |
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} |
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static const grpc_pollset_vtable multipoll_with_epoll_pollset = { |
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multipoll_with_epoll_pollset_add_fd, |
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multipoll_with_epoll_pollset_maybe_work_and_unlock, |
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multipoll_with_epoll_pollset_finish_shutdown, |
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multipoll_with_epoll_pollset_destroy}; |
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static void epoll_become_multipoller(grpc_exec_ctx *exec_ctx, |
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grpc_pollset *pollset, grpc_fd **fds, |
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size_t nfds) { |
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size_t i; |
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pollset_hdr *h = gpr_malloc(sizeof(pollset_hdr)); |
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struct epoll_event ev; |
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int err; |
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pollset->vtable = &multipoll_with_epoll_pollset; |
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pollset->data.ptr = h; |
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h->epoll_fd = epoll_create1(EPOLL_CLOEXEC); |
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if (h->epoll_fd < 0) { |
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/* TODO(klempner): Fall back to poll here, especially on ENOSYS */ |
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gpr_log(GPR_ERROR, "epoll_create1 failed: %s", strerror(errno)); |
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abort(); |
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} |
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add_epoll_fd_to_global_list(h->epoll_fd); |
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ev.events = (uint32_t)(EPOLLIN | EPOLLET); |
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ev.data.ptr = NULL; |
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err = epoll_ctl(h->epoll_fd, EPOLL_CTL_ADD, |
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GRPC_WAKEUP_FD_GET_READ_FD(&grpc_global_wakeup_fd), &ev); |
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if (err < 0) { |
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gpr_log(GPR_ERROR, "epoll_ctl add for %d failed: %s", |
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GRPC_WAKEUP_FD_GET_READ_FD(&grpc_global_wakeup_fd), |
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strerror(errno)); |
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} |
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for (i = 0; i < nfds; i++) { |
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multipoll_with_epoll_pollset_add_fd(exec_ctx, pollset, fds[i], 0); |
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} |
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} |
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grpc_platform_become_multipoller_type grpc_platform_become_multipoller = |
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epoll_become_multipoller; |
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#else /* GPR_LINUX_MULTIPOLL_WITH_EPOLL */ |
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void grpc_remove_fd_from_all_epoll_sets(int fd) {} |
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#endif /* GPR_LINUX_MULTIPOLL_WITH_EPOLL */ |
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@ -1,230 +0,0 @@ |
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/*
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* |
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* Copyright 2015-2016, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#include <grpc/support/port_platform.h> |
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#ifdef GPR_POSIX_SOCKET |
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#include "src/core/iomgr/pollset_posix.h" |
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#include <errno.h> |
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#include <poll.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <grpc/support/alloc.h> |
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#include <grpc/support/log.h> |
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#include <grpc/support/useful.h> |
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#include "src/core/iomgr/ev_posix.h" |
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#include "src/core/iomgr/iomgr_internal.h" |
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#include "src/core/support/block_annotate.h" |
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typedef struct { |
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/* all polled fds */ |
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size_t fd_count; |
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size_t fd_capacity; |
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grpc_fd **fds; |
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/* fds that have been removed from the pollset explicitly */ |
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size_t del_count; |
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size_t del_capacity; |
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grpc_fd **dels; |
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} pollset_hdr; |
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static void multipoll_with_poll_pollset_add_fd(grpc_exec_ctx *exec_ctx, |
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grpc_pollset *pollset, |
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grpc_fd *fd, |
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int and_unlock_pollset) { |
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size_t i; |
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pollset_hdr *h = pollset->data.ptr; |
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/* TODO(ctiller): this is O(num_fds^2); maybe switch to a hash set here */ |
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for (i = 0; i < h->fd_count; i++) { |
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if (h->fds[i] == fd) goto exit; |
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} |
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if (h->fd_count == h->fd_capacity) { |
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h->fd_capacity = GPR_MAX(h->fd_capacity + 8, h->fd_count * 3 / 2); |
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h->fds = gpr_realloc(h->fds, sizeof(grpc_fd *) * h->fd_capacity); |
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} |
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h->fds[h->fd_count++] = fd; |
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GRPC_FD_REF(fd, "multipoller"); |
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exit: |
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if (and_unlock_pollset) { |
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gpr_mu_unlock(pollset->mu); |
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} |
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} |
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static void multipoll_with_poll_pollset_maybe_work_and_unlock( |
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grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, grpc_pollset_worker *worker, |
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gpr_timespec deadline, gpr_timespec now) { |
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#define POLLOUT_CHECK (POLLOUT | POLLHUP | POLLERR) |
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#define POLLIN_CHECK (POLLIN | POLLHUP | POLLERR) |
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int timeout; |
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int r; |
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size_t i, j, fd_count; |
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nfds_t pfd_count; |
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pollset_hdr *h; |
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/* TODO(ctiller): inline some elements to avoid an allocation */ |
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grpc_fd_watcher *watchers; |
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struct pollfd *pfds; |
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h = pollset->data.ptr; |
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timeout = grpc_poll_deadline_to_millis_timeout(deadline, now); |
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/* TODO(ctiller): perform just one malloc here if we exceed the inline case */ |
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pfds = gpr_malloc(sizeof(*pfds) * (h->fd_count + 2)); |
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watchers = gpr_malloc(sizeof(*watchers) * (h->fd_count + 2)); |
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fd_count = 0; |
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pfd_count = 2; |
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pfds[0].fd = GRPC_WAKEUP_FD_GET_READ_FD(&grpc_global_wakeup_fd); |
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pfds[0].events = POLLIN; |
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pfds[0].revents = 0; |
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pfds[1].fd = GRPC_WAKEUP_FD_GET_READ_FD(&worker->wakeup_fd->fd); |
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pfds[1].events = POLLIN; |
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pfds[1].revents = 0; |
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for (i = 0; i < h->fd_count; i++) { |
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int remove = grpc_fd_is_orphaned(h->fds[i]); |
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for (j = 0; !remove && j < h->del_count; j++) { |
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if (h->fds[i] == h->dels[j]) remove = 1; |
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} |
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if (remove) { |
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GRPC_FD_UNREF(h->fds[i], "multipoller"); |
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} else { |
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h->fds[fd_count++] = h->fds[i]; |
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watchers[pfd_count].fd = h->fds[i]; |
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pfds[pfd_count].fd = h->fds[i]->fd; |
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pfds[pfd_count].revents = 0; |
||||
pfd_count++; |
||||
} |
||||
} |
||||
for (j = 0; j < h->del_count; j++) { |
||||
GRPC_FD_UNREF(h->dels[j], "multipoller_del"); |
||||
} |
||||
h->del_count = 0; |
||||
h->fd_count = fd_count; |
||||
gpr_mu_unlock(pollset->mu); |
||||
|
||||
for (i = 2; i < pfd_count; i++) { |
||||
pfds[i].events = (short)grpc_fd_begin_poll(watchers[i].fd, pollset, worker, |
||||
POLLIN, POLLOUT, &watchers[i]); |
||||
} |
||||
|
||||
/* TODO(vpai): Consider first doing a 0 timeout poll here to avoid
|
||||
even going into the blocking annotation if possible */ |
||||
GRPC_SCHEDULING_START_BLOCKING_REGION; |
||||
r = grpc_poll_function(pfds, pfd_count, timeout); |
||||
GRPC_SCHEDULING_END_BLOCKING_REGION; |
||||
|
||||
if (r < 0) { |
||||
if (errno != EINTR) { |
||||
gpr_log(GPR_ERROR, "poll() failed: %s", strerror(errno)); |
||||
} |
||||
for (i = 2; i < pfd_count; i++) { |
||||
grpc_fd_end_poll(exec_ctx, &watchers[i], 0, 0); |
||||
} |
||||
} else if (r == 0) { |
||||
for (i = 2; i < pfd_count; i++) { |
||||
grpc_fd_end_poll(exec_ctx, &watchers[i], 0, 0); |
||||
} |
||||
} else { |
||||
if (pfds[0].revents & POLLIN_CHECK) { |
||||
grpc_wakeup_fd_consume_wakeup(&grpc_global_wakeup_fd); |
||||
} |
||||
if (pfds[1].revents & POLLIN_CHECK) { |
||||
grpc_wakeup_fd_consume_wakeup(&worker->wakeup_fd->fd); |
||||
} |
||||
for (i = 2; i < pfd_count; i++) { |
||||
if (watchers[i].fd == NULL) { |
||||
grpc_fd_end_poll(exec_ctx, &watchers[i], 0, 0); |
||||
continue; |
||||
} |
||||
grpc_fd_end_poll(exec_ctx, &watchers[i], pfds[i].revents & POLLIN_CHECK, |
||||
pfds[i].revents & POLLOUT_CHECK); |
||||
} |
||||
} |
||||
|
||||
gpr_free(pfds); |
||||
gpr_free(watchers); |
||||
} |
||||
|
||||
static void multipoll_with_poll_pollset_finish_shutdown(grpc_pollset *pollset) { |
||||
size_t i; |
||||
pollset_hdr *h = pollset->data.ptr; |
||||
for (i = 0; i < h->fd_count; i++) { |
||||
GRPC_FD_UNREF(h->fds[i], "multipoller"); |
||||
} |
||||
for (i = 0; i < h->del_count; i++) { |
||||
GRPC_FD_UNREF(h->dels[i], "multipoller_del"); |
||||
} |
||||
h->fd_count = 0; |
||||
h->del_count = 0; |
||||
} |
||||
|
||||
static void multipoll_with_poll_pollset_destroy(grpc_pollset *pollset) { |
||||
pollset_hdr *h = pollset->data.ptr; |
||||
multipoll_with_poll_pollset_finish_shutdown(pollset); |
||||
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_maybe_work_and_unlock, |
||||
multipoll_with_poll_pollset_finish_shutdown, |
||||
multipoll_with_poll_pollset_destroy}; |
||||
|
||||
void grpc_poll_become_multipoller(grpc_exec_ctx *exec_ctx, |
||||
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->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], "multipoller"); |
||||
} |
||||
} |
||||
|
||||
#endif /* GPR_POSIX_SOCKET */ |
||||
|
||||
#ifdef GPR_POSIX_MULTIPOLL_WITH_POLL |
||||
grpc_platform_become_multipoller_type grpc_platform_become_multipoller = |
||||
grpc_poll_become_multipoller; |
||||
#endif |
||||
@ -1,633 +0,0 @@ |
||||
/*
|
||||
* |
||||
* Copyright 2015-2016, 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_SOCKET |
||||
|
||||
#include "src/core/iomgr/pollset_posix.h" |
||||
|
||||
#include <errno.h> |
||||
#include <stdlib.h> |
||||
#include <string.h> |
||||
#include <unistd.h> |
||||
|
||||
#include <grpc/support/alloc.h> |
||||
#include <grpc/support/log.h> |
||||
#include <grpc/support/thd.h> |
||||
#include <grpc/support/tls.h> |
||||
#include <grpc/support/useful.h> |
||||
|
||||
#include "src/core/iomgr/ev_posix.h" |
||||
#include "src/core/iomgr/iomgr_internal.h" |
||||
#include "src/core/iomgr/socket_utils_posix.h" |
||||
#include "src/core/profiling/timers.h" |
||||
#include "src/core/support/block_annotate.h" |
||||
|
||||
GPR_TLS_DECL(g_current_thread_poller); |
||||
GPR_TLS_DECL(g_current_thread_worker); |
||||
|
||||
/** Default poll() function - a pointer so that it can be overridden by some
|
||||
* tests */ |
||||
grpc_poll_function_type grpc_poll_function = poll; |
||||
|
||||
/** The alarm system needs to be able to wakeup 'some poller' sometimes
|
||||
* (specifically when a new alarm needs to be triggered earlier than the next |
||||
* alarm 'epoch'). |
||||
* This wakeup_fd gives us something to alert on when such a case occurs. */ |
||||
grpc_wakeup_fd grpc_global_wakeup_fd; |
||||
|
||||
static void remove_worker(grpc_pollset *p, grpc_pollset_worker *worker) { |
||||
worker->prev->next = worker->next; |
||||
worker->next->prev = worker->prev; |
||||
} |
||||
|
||||
int grpc_pollset_has_workers(grpc_pollset *p) { |
||||
return p->root_worker.next != &p->root_worker; |
||||
} |
||||
|
||||
static grpc_pollset_worker *pop_front_worker(grpc_pollset *p) { |
||||
if (grpc_pollset_has_workers(p)) { |
||||
grpc_pollset_worker *w = p->root_worker.next; |
||||
remove_worker(p, w); |
||||
return w; |
||||
} else { |
||||
return NULL; |
||||
} |
||||
} |
||||
|
||||
static void push_back_worker(grpc_pollset *p, grpc_pollset_worker *worker) { |
||||
worker->next = &p->root_worker; |
||||
worker->prev = worker->next->prev; |
||||
worker->prev->next = worker->next->prev = worker; |
||||
} |
||||
|
||||
static void push_front_worker(grpc_pollset *p, grpc_pollset_worker *worker) { |
||||
worker->prev = &p->root_worker; |
||||
worker->next = worker->prev->next; |
||||
worker->prev->next = worker->next->prev = worker; |
||||
} |
||||
|
||||
size_t grpc_pollset_size(void) { return sizeof(grpc_pollset); } |
||||
|
||||
void grpc_pollset_kick_ext(grpc_pollset *p, |
||||
grpc_pollset_worker *specific_worker, |
||||
uint32_t flags) { |
||||
GPR_TIMER_BEGIN("grpc_pollset_kick_ext", 0); |
||||
|
||||
/* pollset->mu already held */ |
||||
if (specific_worker != NULL) { |
||||
if (specific_worker == GRPC_POLLSET_KICK_BROADCAST) { |
||||
GPR_TIMER_BEGIN("grpc_pollset_kick_ext.broadcast", 0); |
||||
GPR_ASSERT((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) == 0); |
||||
for (specific_worker = p->root_worker.next; |
||||
specific_worker != &p->root_worker; |
||||
specific_worker = specific_worker->next) { |
||||
grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd); |
||||
} |
||||
p->kicked_without_pollers = 1; |
||||
GPR_TIMER_END("grpc_pollset_kick_ext.broadcast", 0); |
||||
} else if (gpr_tls_get(&g_current_thread_worker) != |
||||
(intptr_t)specific_worker) { |
||||
GPR_TIMER_MARK("different_thread_worker", 0); |
||||
if ((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) != 0) { |
||||
specific_worker->reevaluate_polling_on_wakeup = 1; |
||||
} |
||||
specific_worker->kicked_specifically = 1; |
||||
grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd); |
||||
} else if ((flags & GRPC_POLLSET_CAN_KICK_SELF) != 0) { |
||||
GPR_TIMER_MARK("kick_yoself", 0); |
||||
if ((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) != 0) { |
||||
specific_worker->reevaluate_polling_on_wakeup = 1; |
||||
} |
||||
specific_worker->kicked_specifically = 1; |
||||
grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd); |
||||
} |
||||
} else if (gpr_tls_get(&g_current_thread_poller) != (intptr_t)p) { |
||||
GPR_ASSERT((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) == 0); |
||||
GPR_TIMER_MARK("kick_anonymous", 0); |
||||
specific_worker = pop_front_worker(p); |
||||
if (specific_worker != NULL) { |
||||
if (gpr_tls_get(&g_current_thread_worker) == (intptr_t)specific_worker) { |
||||
GPR_TIMER_MARK("kick_anonymous_not_self", 0); |
||||
push_back_worker(p, specific_worker); |
||||
specific_worker = pop_front_worker(p); |
||||
if ((flags & GRPC_POLLSET_CAN_KICK_SELF) == 0 && |
||||
gpr_tls_get(&g_current_thread_worker) == |
||||
(intptr_t)specific_worker) { |
||||
push_back_worker(p, specific_worker); |
||||
specific_worker = NULL; |
||||
} |
||||
} |
||||
if (specific_worker != NULL) { |
||||
GPR_TIMER_MARK("finally_kick", 0); |
||||
push_back_worker(p, specific_worker); |
||||
grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd); |
||||
} |
||||
} else { |
||||
GPR_TIMER_MARK("kicked_no_pollers", 0); |
||||
p->kicked_without_pollers = 1; |
||||
} |
||||
} |
||||
|
||||
GPR_TIMER_END("grpc_pollset_kick_ext", 0); |
||||
} |
||||
|
||||
void grpc_pollset_kick(grpc_pollset *p, grpc_pollset_worker *specific_worker) { |
||||
grpc_pollset_kick_ext(p, specific_worker, 0); |
||||
} |
||||
|
||||
/* global state management */ |
||||
|
||||
void grpc_pollset_global_init(void) { |
||||
gpr_tls_init(&g_current_thread_poller); |
||||
gpr_tls_init(&g_current_thread_worker); |
||||
grpc_wakeup_fd_global_init(); |
||||
grpc_wakeup_fd_init(&grpc_global_wakeup_fd); |
||||
} |
||||
|
||||
void grpc_pollset_global_shutdown(void) { |
||||
grpc_wakeup_fd_destroy(&grpc_global_wakeup_fd); |
||||
gpr_tls_destroy(&g_current_thread_poller); |
||||
gpr_tls_destroy(&g_current_thread_worker); |
||||
grpc_wakeup_fd_global_destroy(); |
||||
} |
||||
|
||||
void grpc_kick_poller(void) { grpc_wakeup_fd_wakeup(&grpc_global_wakeup_fd); } |
||||
|
||||
/* main interface */ |
||||
|
||||
static void become_basic_pollset(grpc_pollset *pollset, grpc_fd *fd_or_null); |
||||
|
||||
void grpc_pollset_init(grpc_pollset *pollset, gpr_mu *mu) { |
||||
pollset->mu = mu; |
||||
pollset->root_worker.next = pollset->root_worker.prev = &pollset->root_worker; |
||||
pollset->in_flight_cbs = 0; |
||||
pollset->shutting_down = 0; |
||||
pollset->called_shutdown = 0; |
||||
pollset->kicked_without_pollers = 0; |
||||
pollset->idle_jobs.head = pollset->idle_jobs.tail = NULL; |
||||
pollset->local_wakeup_cache = NULL; |
||||
pollset->kicked_without_pollers = 0; |
||||
become_basic_pollset(pollset, NULL); |
||||
} |
||||
|
||||
void grpc_pollset_destroy(grpc_pollset *pollset) { |
||||
GPR_ASSERT(pollset->in_flight_cbs == 0); |
||||
GPR_ASSERT(!grpc_pollset_has_workers(pollset)); |
||||
GPR_ASSERT(pollset->idle_jobs.head == pollset->idle_jobs.tail); |
||||
pollset->vtable->destroy(pollset); |
||||
while (pollset->local_wakeup_cache) { |
||||
grpc_cached_wakeup_fd *next = pollset->local_wakeup_cache->next; |
||||
grpc_wakeup_fd_destroy(&pollset->local_wakeup_cache->fd); |
||||
gpr_free(pollset->local_wakeup_cache); |
||||
pollset->local_wakeup_cache = next; |
||||
} |
||||
} |
||||
|
||||
void grpc_pollset_reset(grpc_pollset *pollset) { |
||||
GPR_ASSERT(pollset->shutting_down); |
||||
GPR_ASSERT(pollset->in_flight_cbs == 0); |
||||
GPR_ASSERT(!grpc_pollset_has_workers(pollset)); |
||||
GPR_ASSERT(pollset->idle_jobs.head == pollset->idle_jobs.tail); |
||||
pollset->vtable->destroy(pollset); |
||||
pollset->shutting_down = 0; |
||||
pollset->called_shutdown = 0; |
||||
pollset->kicked_without_pollers = 0; |
||||
become_basic_pollset(pollset, NULL); |
||||
} |
||||
|
||||
void grpc_pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
||||
grpc_fd *fd) { |
||||
gpr_mu_lock(pollset->mu); |
||||
pollset->vtable->add_fd(exec_ctx, pollset, fd, 1); |
||||
/* the following (enabled only in debug) will reacquire and then release
|
||||
our lock - meaning that if the unlocking flag passed to add_fd above is |
||||
not respected, the code will deadlock (in a way that we have a chance of |
||||
debugging) */ |
||||
#ifndef NDEBUG |
||||
gpr_mu_lock(pollset->mu); |
||||
gpr_mu_unlock(pollset->mu); |
||||
#endif |
||||
} |
||||
|
||||
static void finish_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset) { |
||||
GPR_ASSERT(grpc_closure_list_empty(pollset->idle_jobs)); |
||||
pollset->vtable->finish_shutdown(pollset); |
||||
grpc_exec_ctx_enqueue(exec_ctx, pollset->shutdown_done, true, NULL); |
||||
} |
||||
|
||||
void grpc_pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
||||
grpc_pollset_worker **worker_hdl, gpr_timespec now, |
||||
gpr_timespec deadline) { |
||||
grpc_pollset_worker worker; |
||||
*worker_hdl = &worker; |
||||
|
||||
/* pollset->mu already held */ |
||||
int added_worker = 0; |
||||
int locked = 1; |
||||
int queued_work = 0; |
||||
int keep_polling = 0; |
||||
GPR_TIMER_BEGIN("grpc_pollset_work", 0); |
||||
/* this must happen before we (potentially) drop pollset->mu */ |
||||
worker.next = worker.prev = NULL; |
||||
worker.reevaluate_polling_on_wakeup = 0; |
||||
if (pollset->local_wakeup_cache != NULL) { |
||||
worker.wakeup_fd = pollset->local_wakeup_cache; |
||||
pollset->local_wakeup_cache = worker.wakeup_fd->next; |
||||
} else { |
||||
worker.wakeup_fd = gpr_malloc(sizeof(*worker.wakeup_fd)); |
||||
grpc_wakeup_fd_init(&worker.wakeup_fd->fd); |
||||
} |
||||
worker.kicked_specifically = 0; |
||||
/* If there's work waiting for the pollset to be idle, and the
|
||||
pollset is idle, then do that work */ |
||||
if (!grpc_pollset_has_workers(pollset) && |
||||
!grpc_closure_list_empty(pollset->idle_jobs)) { |
||||
GPR_TIMER_MARK("grpc_pollset_work.idle_jobs", 0); |
||||
grpc_exec_ctx_enqueue_list(exec_ctx, &pollset->idle_jobs, NULL); |
||||
goto done; |
||||
} |
||||
/* If we're shutting down then we don't execute any extended work */ |
||||
if (pollset->shutting_down) { |
||||
GPR_TIMER_MARK("grpc_pollset_work.shutting_down", 0); |
||||
goto done; |
||||
} |
||||
/* Give do_promote priority so we don't starve it out */ |
||||
if (pollset->in_flight_cbs) { |
||||
GPR_TIMER_MARK("grpc_pollset_work.in_flight_cbs", 0); |
||||
gpr_mu_unlock(pollset->mu); |
||||
locked = 0; |
||||
goto done; |
||||
} |
||||
/* Start polling, and keep doing so while we're being asked to
|
||||
re-evaluate our pollers (this allows poll() based pollers to |
||||
ensure they don't miss wakeups) */ |
||||
keep_polling = 1; |
||||
while (keep_polling) { |
||||
keep_polling = 0; |
||||
if (!pollset->kicked_without_pollers) { |
||||
if (!added_worker) { |
||||
push_front_worker(pollset, &worker); |
||||
added_worker = 1; |
||||
gpr_tls_set(&g_current_thread_worker, (intptr_t)&worker); |
||||
} |
||||
gpr_tls_set(&g_current_thread_poller, (intptr_t)pollset); |
||||
GPR_TIMER_BEGIN("maybe_work_and_unlock", 0); |
||||
pollset->vtable->maybe_work_and_unlock(exec_ctx, pollset, &worker, |
||||
deadline, now); |
||||
GPR_TIMER_END("maybe_work_and_unlock", 0); |
||||
locked = 0; |
||||
gpr_tls_set(&g_current_thread_poller, 0); |
||||
} else { |
||||
GPR_TIMER_MARK("grpc_pollset_work.kicked_without_pollers", 0); |
||||
pollset->kicked_without_pollers = 0; |
||||
} |
||||
/* Finished execution - start cleaning up.
|
||||
Note that we may arrive here from outside the enclosing while() loop. |
||||
In that case we won't loop though as we haven't added worker to the |
||||
worker list, which means nobody could ask us to re-evaluate polling). */ |
||||
done: |
||||
if (!locked) { |
||||
queued_work |= grpc_exec_ctx_flush(exec_ctx); |
||||
gpr_mu_lock(pollset->mu); |
||||
locked = 1; |
||||
} |
||||
/* If we're forced to re-evaluate polling (via grpc_pollset_kick with
|
||||
GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) then we land here and force |
||||
a loop */ |
||||
if (worker.reevaluate_polling_on_wakeup) { |
||||
worker.reevaluate_polling_on_wakeup = 0; |
||||
pollset->kicked_without_pollers = 0; |
||||
if (queued_work || worker.kicked_specifically) { |
||||
/* If there's queued work on the list, then set the deadline to be
|
||||
immediate so we get back out of the polling loop quickly */ |
||||
deadline = gpr_inf_past(GPR_CLOCK_MONOTONIC); |
||||
} |
||||
keep_polling = 1; |
||||
} |
||||
} |
||||
if (added_worker) { |
||||
remove_worker(pollset, &worker); |
||||
gpr_tls_set(&g_current_thread_worker, 0); |
||||
} |
||||
/* release wakeup fd to the local pool */ |
||||
worker.wakeup_fd->next = pollset->local_wakeup_cache; |
||||
pollset->local_wakeup_cache = worker.wakeup_fd; |
||||
/* check shutdown conditions */ |
||||
if (pollset->shutting_down) { |
||||
if (grpc_pollset_has_workers(pollset)) { |
||||
grpc_pollset_kick(pollset, NULL); |
||||
} else if (!pollset->called_shutdown && pollset->in_flight_cbs == 0) { |
||||
pollset->called_shutdown = 1; |
||||
gpr_mu_unlock(pollset->mu); |
||||
finish_shutdown(exec_ctx, pollset); |
||||
grpc_exec_ctx_flush(exec_ctx); |
||||
/* Continuing to access pollset here is safe -- it is the caller's
|
||||
* responsibility to not destroy when it has outstanding calls to |
||||
* grpc_pollset_work. |
||||
* TODO(dklempner): Can we refactor the shutdown logic to avoid this? */ |
||||
gpr_mu_lock(pollset->mu); |
||||
} else if (!grpc_closure_list_empty(pollset->idle_jobs)) { |
||||
grpc_exec_ctx_enqueue_list(exec_ctx, &pollset->idle_jobs, NULL); |
||||
gpr_mu_unlock(pollset->mu); |
||||
grpc_exec_ctx_flush(exec_ctx); |
||||
gpr_mu_lock(pollset->mu); |
||||
} |
||||
} |
||||
*worker_hdl = NULL; |
||||
GPR_TIMER_END("grpc_pollset_work", 0); |
||||
} |
||||
|
||||
void grpc_pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
||||
grpc_closure *closure) { |
||||
GPR_ASSERT(!pollset->shutting_down); |
||||
pollset->shutting_down = 1; |
||||
pollset->shutdown_done = closure; |
||||
grpc_pollset_kick(pollset, GRPC_POLLSET_KICK_BROADCAST); |
||||
if (!grpc_pollset_has_workers(pollset)) { |
||||
grpc_exec_ctx_enqueue_list(exec_ctx, &pollset->idle_jobs, NULL); |
||||
} |
||||
if (!pollset->called_shutdown && pollset->in_flight_cbs == 0 && |
||||
!grpc_pollset_has_workers(pollset)) { |
||||
pollset->called_shutdown = 1; |
||||
finish_shutdown(exec_ctx, pollset); |
||||
} |
||||
} |
||||
|
||||
int grpc_poll_deadline_to_millis_timeout(gpr_timespec deadline, |
||||
gpr_timespec now) { |
||||
gpr_timespec timeout; |
||||
static const int64_t max_spin_polling_us = 10; |
||||
if (gpr_time_cmp(deadline, gpr_inf_future(deadline.clock_type)) == 0) { |
||||
return -1; |
||||
} |
||||
if (gpr_time_cmp(deadline, gpr_time_add(now, gpr_time_from_micros( |
||||
max_spin_polling_us, |
||||
GPR_TIMESPAN))) <= 0) { |
||||
return 0; |
||||
} |
||||
timeout = gpr_time_sub(deadline, now); |
||||
return gpr_time_to_millis(gpr_time_add( |
||||
timeout, gpr_time_from_nanos(GPR_NS_PER_MS - 1, GPR_TIMESPAN))); |
||||
} |
||||
|
||||
/*
|
||||
* basic_pollset - a vtable that provides polling for zero or one file |
||||
* descriptor via poll() |
||||
*/ |
||||
|
||||
typedef struct grpc_unary_promote_args { |
||||
const grpc_pollset_vtable *original_vtable; |
||||
grpc_pollset *pollset; |
||||
grpc_fd *fd; |
||||
grpc_closure promotion_closure; |
||||
} grpc_unary_promote_args; |
||||
|
||||
static void basic_do_promote(grpc_exec_ctx *exec_ctx, void *args, |
||||
bool success) { |
||||
grpc_unary_promote_args *up_args = args; |
||||
const grpc_pollset_vtable *original_vtable = up_args->original_vtable; |
||||
grpc_pollset *pollset = up_args->pollset; |
||||
grpc_fd *fd = up_args->fd; |
||||
|
||||
/*
|
||||
* This is quite tricky. There are a number of cases to keep in mind here: |
||||
* 1. fd may have been orphaned |
||||
* 2. The pollset may no longer be a unary poller (and we can't let case #1 |
||||
* leak to other pollset types!) |
||||
* 3. pollset's fd (which may have changed) may have been orphaned |
||||
* 4. The pollset may be shutting down. |
||||
*/ |
||||
|
||||
gpr_mu_lock(pollset->mu); |
||||
/* First we need to ensure that nobody is polling concurrently */ |
||||
GPR_ASSERT(!grpc_pollset_has_workers(pollset)); |
||||
|
||||
gpr_free(up_args); |
||||
/* At this point the pollset may no longer be a unary poller. In that case
|
||||
* we should just call the right add function and be done. */ |
||||
/* TODO(klempner): If we're not careful this could cause infinite recursion.
|
||||
* That's not a problem for now because empty_pollset has a trivial poller |
||||
* and we don't have any mechanism to unbecome multipoller. */ |
||||
pollset->in_flight_cbs--; |
||||
if (pollset->shutting_down) { |
||||
/* We don't care about this pollset anymore. */ |
||||
if (pollset->in_flight_cbs == 0 && !pollset->called_shutdown) { |
||||
pollset->called_shutdown = 1; |
||||
finish_shutdown(exec_ctx, pollset); |
||||
} |
||||
} else if (grpc_fd_is_orphaned(fd)) { |
||||
/* Don't try to add it to anything, we'll drop our ref on it below */ |
||||
} else if (pollset->vtable != original_vtable) { |
||||
pollset->vtable->add_fd(exec_ctx, pollset, fd, 0); |
||||
} else if (fd != pollset->data.ptr) { |
||||
grpc_fd *fds[2]; |
||||
fds[0] = pollset->data.ptr; |
||||
fds[1] = fd; |
||||
|
||||
if (fds[0] && !grpc_fd_is_orphaned(fds[0])) { |
||||
grpc_platform_become_multipoller(exec_ctx, pollset, fds, |
||||
GPR_ARRAY_SIZE(fds)); |
||||
GRPC_FD_UNREF(fds[0], "basicpoll"); |
||||
} else { |
||||
/* old fd is orphaned and we haven't cleaned it up until now, so remain a
|
||||
* unary poller */ |
||||
/* Note that it is possible that fds[1] is also orphaned at this point.
|
||||
* That's okay, we'll correct it at the next add or poll. */ |
||||
if (fds[0]) GRPC_FD_UNREF(fds[0], "basicpoll"); |
||||
pollset->data.ptr = fd; |
||||
GRPC_FD_REF(fd, "basicpoll"); |
||||
} |
||||
} |
||||
|
||||
gpr_mu_unlock(pollset->mu); |
||||
|
||||
/* Matching ref in basic_pollset_add_fd */ |
||||
GRPC_FD_UNREF(fd, "basicpoll_add"); |
||||
} |
||||
|
||||
static void basic_pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
||||
grpc_fd *fd, int and_unlock_pollset) { |
||||
grpc_unary_promote_args *up_args; |
||||
GPR_ASSERT(fd); |
||||
if (fd == pollset->data.ptr) goto exit; |
||||
|
||||
if (!grpc_pollset_has_workers(pollset)) { |
||||
/* Fast path -- no in flight cbs */ |
||||
/* TODO(klempner): Comment this out and fix any test failures or establish
|
||||
* they are due to timing issues */ |
||||
grpc_fd *fds[2]; |
||||
fds[0] = pollset->data.ptr; |
||||
fds[1] = fd; |
||||
|
||||
if (fds[0] == NULL) { |
||||
pollset->data.ptr = fd; |
||||
GRPC_FD_REF(fd, "basicpoll"); |
||||
} else if (!grpc_fd_is_orphaned(fds[0])) { |
||||
grpc_platform_become_multipoller(exec_ctx, pollset, fds, |
||||
GPR_ARRAY_SIZE(fds)); |
||||
GRPC_FD_UNREF(fds[0], "basicpoll"); |
||||
} else { |
||||
/* old fd is orphaned and we haven't cleaned it up until now, so remain a
|
||||
* unary poller */ |
||||
GRPC_FD_UNREF(fds[0], "basicpoll"); |
||||
pollset->data.ptr = fd; |
||||
GRPC_FD_REF(fd, "basicpoll"); |
||||
} |
||||
goto exit; |
||||
} |
||||
|
||||
/* Now we need to promote. This needs to happen when we're not polling. Since
|
||||
* this may be called from poll, the wait needs to happen asynchronously. */ |
||||
GRPC_FD_REF(fd, "basicpoll_add"); |
||||
pollset->in_flight_cbs++; |
||||
up_args = gpr_malloc(sizeof(*up_args)); |
||||
up_args->fd = fd; |
||||
up_args->original_vtable = pollset->vtable; |
||||
up_args->pollset = pollset; |
||||
up_args->promotion_closure.cb = basic_do_promote; |
||||
up_args->promotion_closure.cb_arg = up_args; |
||||
|
||||
grpc_closure_list_add(&pollset->idle_jobs, &up_args->promotion_closure, 1); |
||||
grpc_pollset_kick(pollset, GRPC_POLLSET_KICK_BROADCAST); |
||||
|
||||
exit: |
||||
if (and_unlock_pollset) { |
||||
gpr_mu_unlock(pollset->mu); |
||||
} |
||||
} |
||||
|
||||
static void basic_pollset_maybe_work_and_unlock(grpc_exec_ctx *exec_ctx, |
||||
grpc_pollset *pollset, |
||||
grpc_pollset_worker *worker, |
||||
gpr_timespec deadline, |
||||
gpr_timespec now) { |
||||
#define POLLOUT_CHECK (POLLOUT | POLLHUP | POLLERR) |
||||
#define POLLIN_CHECK (POLLIN | POLLHUP | POLLERR) |
||||
|
||||
struct pollfd pfd[3]; |
||||
grpc_fd *fd; |
||||
grpc_fd_watcher fd_watcher; |
||||
int timeout; |
||||
int r; |
||||
nfds_t nfds; |
||||
|
||||
fd = pollset->data.ptr; |
||||
if (fd && grpc_fd_is_orphaned(fd)) { |
||||
GRPC_FD_UNREF(fd, "basicpoll"); |
||||
fd = pollset->data.ptr = NULL; |
||||
} |
||||
timeout = grpc_poll_deadline_to_millis_timeout(deadline, now); |
||||
pfd[0].fd = GRPC_WAKEUP_FD_GET_READ_FD(&grpc_global_wakeup_fd); |
||||
pfd[0].events = POLLIN; |
||||
pfd[0].revents = 0; |
||||
pfd[1].fd = GRPC_WAKEUP_FD_GET_READ_FD(&worker->wakeup_fd->fd); |
||||
pfd[1].events = POLLIN; |
||||
pfd[1].revents = 0; |
||||
nfds = 2; |
||||
if (fd) { |
||||
pfd[2].fd = fd->fd; |
||||
pfd[2].revents = 0; |
||||
GRPC_FD_REF(fd, "basicpoll_begin"); |
||||
gpr_mu_unlock(pollset->mu); |
||||
pfd[2].events = (short)grpc_fd_begin_poll(fd, pollset, worker, POLLIN, |
||||
POLLOUT, &fd_watcher); |
||||
if (pfd[2].events != 0) { |
||||
nfds++; |
||||
} |
||||
} else { |
||||
gpr_mu_unlock(pollset->mu); |
||||
} |
||||
|
||||
/* TODO(vpai): Consider first doing a 0 timeout poll here to avoid
|
||||
even going into the blocking annotation if possible */ |
||||
/* poll fd count (argument 2) is shortened by one if we have no events
|
||||
to poll on - such that it only includes the kicker */ |
||||
GPR_TIMER_BEGIN("poll", 0); |
||||
GRPC_SCHEDULING_START_BLOCKING_REGION; |
||||
r = grpc_poll_function(pfd, nfds, timeout); |
||||
GRPC_SCHEDULING_END_BLOCKING_REGION; |
||||
GPR_TIMER_END("poll", 0); |
||||
|
||||
if (r < 0) { |
||||
if (errno != EINTR) { |
||||
gpr_log(GPR_ERROR, "poll() failed: %s", strerror(errno)); |
||||
} |
||||
if (fd) { |
||||
grpc_fd_end_poll(exec_ctx, &fd_watcher, 0, 0); |
||||
} |
||||
} else if (r == 0) { |
||||
if (fd) { |
||||
grpc_fd_end_poll(exec_ctx, &fd_watcher, 0, 0); |
||||
} |
||||
} else { |
||||
if (pfd[0].revents & POLLIN_CHECK) { |
||||
grpc_wakeup_fd_consume_wakeup(&grpc_global_wakeup_fd); |
||||
} |
||||
if (pfd[1].revents & POLLIN_CHECK) { |
||||
grpc_wakeup_fd_consume_wakeup(&worker->wakeup_fd->fd); |
||||
} |
||||
if (nfds > 2) { |
||||
grpc_fd_end_poll(exec_ctx, &fd_watcher, pfd[2].revents & POLLIN_CHECK, |
||||
pfd[2].revents & POLLOUT_CHECK); |
||||
} else if (fd) { |
||||
grpc_fd_end_poll(exec_ctx, &fd_watcher, 0, 0); |
||||
} |
||||
} |
||||
|
||||
if (fd) { |
||||
GRPC_FD_UNREF(fd, "basicpoll_begin"); |
||||
} |
||||
} |
||||
|
||||
static void basic_pollset_destroy(grpc_pollset *pollset) { |
||||
if (pollset->data.ptr != NULL) { |
||||
GRPC_FD_UNREF(pollset->data.ptr, "basicpoll"); |
||||
pollset->data.ptr = NULL; |
||||
} |
||||
} |
||||
|
||||
static const grpc_pollset_vtable basic_pollset = { |
||||
basic_pollset_add_fd, basic_pollset_maybe_work_and_unlock, |
||||
basic_pollset_destroy, basic_pollset_destroy}; |
||||
|
||||
static void become_basic_pollset(grpc_pollset *pollset, grpc_fd *fd_or_null) { |
||||
pollset->vtable = &basic_pollset; |
||||
pollset->data.ptr = fd_or_null; |
||||
if (fd_or_null != NULL) { |
||||
GRPC_FD_REF(fd_or_null, "basicpoll"); |
||||
} |
||||
} |
||||
|
||||
#endif /* GPR_POSIX_POLLSET */ |
||||
@ -1,151 +0,0 @@ |
||||
/*
|
||||
* |
||||
* Copyright 2015-2016, 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. |
||||
* |
||||
*/ |
||||
|
||||
#ifndef GRPC_INTERNAL_CORE_IOMGR_POLLSET_POSIX_H |
||||
#define GRPC_INTERNAL_CORE_IOMGR_POLLSET_POSIX_H |
||||
|
||||
#if 0 |
||||
#include <poll.h> |
||||
|
||||
#include <grpc/support/sync.h> |
||||
|
||||
#include "src/core/iomgr/exec_ctx.h" |
||||
#include "src/core/iomgr/iomgr.h" |
||||
#include "src/core/iomgr/pollset.h" |
||||
#include "src/core/iomgr/wakeup_fd_posix.h" |
||||
|
||||
typedef struct grpc_pollset_vtable grpc_pollset_vtable; |
||||
|
||||
/* forward declare only in this file to avoid leaking impl details via
|
||||
pollset.h; real users of grpc_fd should always include 'fd_posix.h' and not |
||||
use the struct tag */ |
||||
struct grpc_fd; |
||||
|
||||
typedef struct grpc_cached_wakeup_fd { |
||||
grpc_wakeup_fd fd; |
||||
struct grpc_cached_wakeup_fd *next; |
||||
} grpc_cached_wakeup_fd; |
||||
|
||||
struct grpc_pollset_worker { |
||||
grpc_cached_wakeup_fd *wakeup_fd; |
||||
int reevaluate_polling_on_wakeup; |
||||
int kicked_specifically; |
||||
struct grpc_pollset_worker *next; |
||||
struct grpc_pollset_worker *prev; |
||||
}; |
||||
|
||||
struct grpc_pollset { |
||||
/* pollsets under posix can mutate representation as fds are added and
|
||||
removed. |
||||
For example, we may choose a poll() based implementation on linux for |
||||
few fds, and an epoll() based implementation for many fds */ |
||||
const grpc_pollset_vtable *vtable; |
||||
gpr_mu *mu; |
||||
grpc_pollset_worker root_worker; |
||||
int in_flight_cbs; |
||||
int shutting_down; |
||||
int called_shutdown; |
||||
int kicked_without_pollers; |
||||
grpc_closure *shutdown_done; |
||||
grpc_closure_list idle_jobs; |
||||
union { |
||||
int fd; |
||||
void *ptr; |
||||
} data; |
||||
/* Local cache of eventfds for workers */ |
||||
grpc_cached_wakeup_fd *local_wakeup_cache; |
||||
}; |
||||
|
||||
struct grpc_pollset_vtable { |
||||
void (*add_fd)(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
||||
struct grpc_fd *fd, int and_unlock_pollset); |
||||
void (*maybe_work_and_unlock)(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
||||
grpc_pollset_worker *worker, |
||||
gpr_timespec deadline, gpr_timespec now); |
||||
void (*finish_shutdown)(grpc_pollset *pollset); |
||||
void (*destroy)(grpc_pollset *pollset); |
||||
}; |
||||
|
||||
/* Add an fd to a pollset */ |
||||
void grpc_pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
||||
struct grpc_fd *fd); |
||||
|
||||
/* Returns the fd to listen on for kicks */ |
||||
int grpc_kick_read_fd(grpc_pollset *p); |
||||
/* Call after polling has been kicked to leave the kicked state */ |
||||
void grpc_kick_drain(grpc_pollset *p); |
||||
|
||||
/* Convert a timespec to milliseconds:
|
||||
- very small or negative poll times are clamped to zero to do a |
||||
non-blocking poll (which becomes spin polling) |
||||
- other small values are rounded up to one millisecond |
||||
- longer than a millisecond polls are rounded up to the next nearest |
||||
millisecond to avoid spinning |
||||
- infinite timeouts are converted to -1 */ |
||||
int grpc_poll_deadline_to_millis_timeout(gpr_timespec deadline, |
||||
gpr_timespec now); |
||||
|
||||
/* Allow kick to wakeup the currently polling worker */ |
||||
#define GRPC_POLLSET_CAN_KICK_SELF 1 |
||||
/* Force the wakee to repoll when awoken */ |
||||
#define GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP 2 |
||||
/* As per grpc_pollset_kick, with an extended set of flags (defined above)
|
||||
-- mostly for fd_posix's use. */ |
||||
void grpc_pollset_kick_ext(grpc_pollset *p, |
||||
grpc_pollset_worker *specific_worker, |
||||
uint32_t flags); |
||||
|
||||
/* turn a pollset into a multipoller: platform specific */ |
||||
typedef void (*grpc_platform_become_multipoller_type)(grpc_exec_ctx *exec_ctx, |
||||
grpc_pollset *pollset, |
||||
struct grpc_fd **fds, |
||||
size_t fd_count); |
||||
extern grpc_platform_become_multipoller_type grpc_platform_become_multipoller; |
||||
|
||||
void grpc_poll_become_multipoller(grpc_exec_ctx *exec_ctx, |
||||
grpc_pollset *pollset, struct grpc_fd **fds, |
||||
size_t fd_count); |
||||
|
||||
/* Return 1 if the pollset has active threads in grpc_pollset_work (pollset must
|
||||
* be locked) */ |
||||
int grpc_pollset_has_workers(grpc_pollset *pollset); |
||||
|
||||
void grpc_remove_fd_from_all_epoll_sets(int fd); |
||||
|
||||
/* override to allow tests to hook poll() usage */ |
||||
typedef int (*grpc_poll_function_type)(struct pollfd *, nfds_t, int); |
||||
extern grpc_poll_function_type grpc_poll_function; |
||||
extern grpc_wakeup_fd grpc_global_wakeup_fd; |
||||
#endif |
||||
|
||||
#endif /* GRPC_INTERNAL_CORE_IOMGR_POLLSET_POSIX_H */ |
||||
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