Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
Craig Tiller | d4838a9 | 2017-04-27 12:08:18 -0700 | [diff] [blame] | 3 | * Copyright 2017, Google Inc. |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions are |
| 8 | * met: |
| 9 | * |
| 10 | * * Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * * Redistributions in binary form must reproduce the above |
| 13 | * copyright notice, this list of conditions and the following disclaimer |
| 14 | * in the documentation and/or other materials provided with the |
| 15 | * distribution. |
| 16 | * * Neither the name of Google Inc. nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from |
| 18 | * this software without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | * |
| 32 | */ |
| 33 | |
| 34 | #include "src/core/lib/iomgr/port.h" |
| 35 | |
| 36 | /* This polling engine is only relevant on linux kernels supporting epoll() */ |
| 37 | #ifdef GRPC_LINUX_EPOLL |
| 38 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 39 | #include "src/core/lib/iomgr/ev_epoll1_linux.h" |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 40 | |
| 41 | #include <assert.h> |
| 42 | #include <errno.h> |
| 43 | #include <poll.h> |
| 44 | #include <pthread.h> |
| 45 | #include <string.h> |
| 46 | #include <sys/epoll.h> |
| 47 | #include <sys/socket.h> |
| 48 | #include <unistd.h> |
| 49 | |
| 50 | #include <grpc/support/alloc.h> |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 51 | #include <grpc/support/cpu.h> |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 52 | #include <grpc/support/log.h> |
| 53 | #include <grpc/support/string_util.h> |
| 54 | #include <grpc/support/tls.h> |
| 55 | #include <grpc/support/useful.h> |
| 56 | |
| 57 | #include "src/core/lib/iomgr/ev_posix.h" |
| 58 | #include "src/core/lib/iomgr/iomgr_internal.h" |
| 59 | #include "src/core/lib/iomgr/lockfree_event.h" |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 60 | #include "src/core/lib/iomgr/wakeup_fd_posix.h" |
| 61 | #include "src/core/lib/iomgr/workqueue.h" |
| 62 | #include "src/core/lib/profiling/timers.h" |
| 63 | #include "src/core/lib/support/block_annotate.h" |
| 64 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 65 | static grpc_wakeup_fd global_wakeup_fd; |
| 66 | static int g_epfd; |
| 67 | |
| 68 | /******************************************************************************* |
| 69 | * Fd Declarations |
| 70 | */ |
| 71 | |
| 72 | struct grpc_fd { |
| 73 | int fd; |
| 74 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 75 | gpr_atm read_closure; |
| 76 | gpr_atm write_closure; |
| 77 | |
| 78 | struct grpc_fd *freelist_next; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 79 | |
| 80 | /* The pollset that last noticed that the fd is readable. The actual type |
| 81 | * stored in this is (grpc_pollset *) */ |
| 82 | gpr_atm read_notifier_pollset; |
| 83 | |
| 84 | grpc_iomgr_object iomgr_object; |
| 85 | }; |
| 86 | |
| 87 | static void fd_global_init(void); |
| 88 | static void fd_global_shutdown(void); |
| 89 | |
| 90 | /******************************************************************************* |
| 91 | * Pollset Declarations |
| 92 | */ |
| 93 | |
Craig Tiller | 43bf259 | 2017-04-28 23:21:01 +0000 | [diff] [blame] | 94 | typedef enum { UNKICKED, KICKED, DESIGNATED_POLLER } kick_state; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 95 | |
| 96 | struct grpc_pollset_worker { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 97 | kick_state kick_state; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 98 | int kick_state_mutator; // which line of code last changed kick state |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 99 | bool initialized_cv; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 100 | grpc_pollset_worker *next; |
| 101 | grpc_pollset_worker *prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 102 | gpr_cv cv; |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 103 | grpc_closure_list schedule_on_end_work; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 104 | }; |
| 105 | |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 106 | #define SET_KICK_STATE(worker, state) \ |
| 107 | do { \ |
| 108 | (worker)->kick_state = (state); \ |
| 109 | (worker)->kick_state_mutator = __LINE__; \ |
| 110 | } while (false) |
| 111 | |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 112 | #define MAX_NEIGHBOURHOODS 1024 |
| 113 | |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 114 | typedef struct pollset_neighbourhood { |
| 115 | gpr_mu mu; |
| 116 | grpc_pollset *active_root; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 117 | char pad[GPR_CACHELINE_SIZE]; |
| 118 | } pollset_neighbourhood; |
| 119 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 120 | struct grpc_pollset { |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 121 | gpr_mu mu; |
| 122 | pollset_neighbourhood *neighbourhood; |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 123 | bool reassigning_neighbourhood; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 124 | grpc_pollset_worker *root_worker; |
| 125 | bool kicked_without_poller; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 126 | bool seen_inactive; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 127 | bool shutting_down; /* Is the pollset shutting down ? */ |
| 128 | bool finish_shutdown_called; /* Is the 'finish_shutdown_locked()' called ? */ |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 129 | grpc_closure *shutdown_closure; /* Called after after shutdown is complete */ |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 130 | int begin_refs; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 131 | |
| 132 | grpc_pollset *next; |
| 133 | grpc_pollset *prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 134 | }; |
| 135 | |
| 136 | /******************************************************************************* |
| 137 | * Pollset-set Declarations |
| 138 | */ |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 139 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 140 | struct grpc_pollset_set {}; |
| 141 | |
| 142 | /******************************************************************************* |
| 143 | * Common helpers |
| 144 | */ |
| 145 | |
| 146 | static bool append_error(grpc_error **composite, grpc_error *error, |
| 147 | const char *desc) { |
| 148 | if (error == GRPC_ERROR_NONE) return true; |
| 149 | if (*composite == GRPC_ERROR_NONE) { |
| 150 | *composite = GRPC_ERROR_CREATE_FROM_COPIED_STRING(desc); |
| 151 | } |
| 152 | *composite = grpc_error_add_child(*composite, error); |
| 153 | return false; |
| 154 | } |
| 155 | |
| 156 | /******************************************************************************* |
| 157 | * Fd Definitions |
| 158 | */ |
| 159 | |
| 160 | /* We need to keep a freelist not because of any concerns of malloc performance |
| 161 | * but instead so that implementations with multiple threads in (for example) |
| 162 | * epoll_wait deal with the race between pollset removal and incoming poll |
| 163 | * notifications. |
| 164 | * |
| 165 | * The problem is that the poller ultimately holds a reference to this |
| 166 | * object, so it is very difficult to know when is safe to free it, at least |
| 167 | * without some expensive synchronization. |
| 168 | * |
| 169 | * If we keep the object freelisted, in the worst case losing this race just |
| 170 | * becomes a spurious read notification on a reused fd. |
| 171 | */ |
| 172 | |
| 173 | /* The alarm system needs to be able to wakeup 'some poller' sometimes |
| 174 | * (specifically when a new alarm needs to be triggered earlier than the next |
| 175 | * alarm 'epoch'). This wakeup_fd gives us something to alert on when such a |
| 176 | * case occurs. */ |
| 177 | |
| 178 | static grpc_fd *fd_freelist = NULL; |
| 179 | static gpr_mu fd_freelist_mu; |
| 180 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 181 | static void fd_global_init(void) { gpr_mu_init(&fd_freelist_mu); } |
| 182 | |
| 183 | static void fd_global_shutdown(void) { |
| 184 | gpr_mu_lock(&fd_freelist_mu); |
| 185 | gpr_mu_unlock(&fd_freelist_mu); |
| 186 | while (fd_freelist != NULL) { |
| 187 | grpc_fd *fd = fd_freelist; |
| 188 | fd_freelist = fd_freelist->freelist_next; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 189 | gpr_free(fd); |
| 190 | } |
| 191 | gpr_mu_destroy(&fd_freelist_mu); |
| 192 | } |
| 193 | |
| 194 | static grpc_fd *fd_create(int fd, const char *name) { |
| 195 | grpc_fd *new_fd = NULL; |
| 196 | |
| 197 | gpr_mu_lock(&fd_freelist_mu); |
| 198 | if (fd_freelist != NULL) { |
| 199 | new_fd = fd_freelist; |
| 200 | fd_freelist = fd_freelist->freelist_next; |
| 201 | } |
| 202 | gpr_mu_unlock(&fd_freelist_mu); |
| 203 | |
| 204 | if (new_fd == NULL) { |
| 205 | new_fd = gpr_malloc(sizeof(grpc_fd)); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 206 | } |
| 207 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 208 | new_fd->fd = fd; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 209 | grpc_lfev_init(&new_fd->read_closure); |
| 210 | grpc_lfev_init(&new_fd->write_closure); |
| 211 | gpr_atm_no_barrier_store(&new_fd->read_notifier_pollset, (gpr_atm)NULL); |
| 212 | |
| 213 | new_fd->freelist_next = NULL; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 214 | |
| 215 | char *fd_name; |
| 216 | gpr_asprintf(&fd_name, "%s fd=%d", name, fd); |
| 217 | grpc_iomgr_register_object(&new_fd->iomgr_object, fd_name); |
| 218 | #ifdef GRPC_FD_REF_COUNT_DEBUG |
| 219 | gpr_log(GPR_DEBUG, "FD %d %p create %s", fd, (void *)new_fd, fd_name); |
| 220 | #endif |
| 221 | gpr_free(fd_name); |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 222 | |
| 223 | struct epoll_event ev = {.events = (uint32_t)(EPOLLIN | EPOLLOUT | EPOLLET), |
| 224 | .data.ptr = new_fd}; |
| 225 | if (epoll_ctl(g_epfd, EPOLL_CTL_ADD, fd, &ev) != 0) { |
| 226 | gpr_log(GPR_ERROR, "epoll_ctl failed: %s", strerror(errno)); |
| 227 | } |
| 228 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 229 | return new_fd; |
| 230 | } |
| 231 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 232 | static int fd_wrapped_fd(grpc_fd *fd) { return fd->fd; } |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 233 | |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 234 | /* Might be called multiple times */ |
| 235 | static void fd_shutdown(grpc_exec_ctx *exec_ctx, grpc_fd *fd, grpc_error *why) { |
| 236 | if (grpc_lfev_set_shutdown(exec_ctx, &fd->read_closure, |
| 237 | GRPC_ERROR_REF(why))) { |
| 238 | shutdown(fd->fd, SHUT_RDWR); |
| 239 | grpc_lfev_set_shutdown(exec_ctx, &fd->write_closure, GRPC_ERROR_REF(why)); |
| 240 | } |
| 241 | GRPC_ERROR_UNREF(why); |
| 242 | } |
| 243 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 244 | static void fd_orphan(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 245 | grpc_closure *on_done, int *release_fd, |
| 246 | const char *reason) { |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 247 | grpc_error *error = GRPC_ERROR_NONE; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 248 | |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 249 | if (!grpc_lfev_is_shutdown(&fd->read_closure)) { |
| 250 | fd_shutdown(exec_ctx, fd, GRPC_ERROR_CREATE_FROM_COPIED_STRING(reason)); |
| 251 | } |
| 252 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 253 | /* If release_fd is not NULL, we should be relinquishing control of the file |
| 254 | descriptor fd->fd (but we still own the grpc_fd structure). */ |
| 255 | if (release_fd != NULL) { |
| 256 | *release_fd = fd->fd; |
| 257 | } else { |
| 258 | close(fd->fd); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 259 | } |
| 260 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 261 | grpc_closure_sched(exec_ctx, on_done, GRPC_ERROR_REF(error)); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 262 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 263 | grpc_iomgr_unregister_object(&fd->iomgr_object); |
| 264 | grpc_lfev_destroy(&fd->read_closure); |
| 265 | grpc_lfev_destroy(&fd->write_closure); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 266 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 267 | gpr_mu_lock(&fd_freelist_mu); |
| 268 | fd->freelist_next = fd_freelist; |
| 269 | fd_freelist = fd; |
| 270 | gpr_mu_unlock(&fd_freelist_mu); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 271 | } |
| 272 | |
| 273 | static grpc_pollset *fd_get_read_notifier_pollset(grpc_exec_ctx *exec_ctx, |
| 274 | grpc_fd *fd) { |
| 275 | gpr_atm notifier = gpr_atm_acq_load(&fd->read_notifier_pollset); |
| 276 | return (grpc_pollset *)notifier; |
| 277 | } |
| 278 | |
| 279 | static bool fd_is_shutdown(grpc_fd *fd) { |
| 280 | return grpc_lfev_is_shutdown(&fd->read_closure); |
| 281 | } |
| 282 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 283 | static void fd_notify_on_read(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 284 | grpc_closure *closure) { |
| 285 | grpc_lfev_notify_on(exec_ctx, &fd->read_closure, closure); |
| 286 | } |
| 287 | |
| 288 | static void fd_notify_on_write(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 289 | grpc_closure *closure) { |
| 290 | grpc_lfev_notify_on(exec_ctx, &fd->write_closure, closure); |
| 291 | } |
| 292 | |
| 293 | static grpc_workqueue *fd_get_workqueue(grpc_fd *fd) { |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 294 | return (grpc_workqueue *)0xb0b51ed; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 295 | } |
| 296 | |
| 297 | static void fd_become_readable(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 298 | grpc_pollset *notifier) { |
| 299 | grpc_lfev_set_ready(exec_ctx, &fd->read_closure); |
| 300 | |
| 301 | /* Note, it is possible that fd_become_readable might be called twice with |
| 302 | different 'notifier's when an fd becomes readable and it is in two epoll |
| 303 | sets (This can happen briefly during polling island merges). In such cases |
| 304 | it does not really matter which notifer is set as the read_notifier_pollset |
| 305 | (They would both point to the same polling island anyway) */ |
| 306 | /* Use release store to match with acquire load in fd_get_read_notifier */ |
| 307 | gpr_atm_rel_store(&fd->read_notifier_pollset, (gpr_atm)notifier); |
| 308 | } |
| 309 | |
| 310 | static void fd_become_writable(grpc_exec_ctx *exec_ctx, grpc_fd *fd) { |
| 311 | grpc_lfev_set_ready(exec_ctx, &fd->write_closure); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 312 | } |
| 313 | |
| 314 | /******************************************************************************* |
| 315 | * Pollset Definitions |
| 316 | */ |
| 317 | |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 318 | GPR_TLS_DECL(g_current_thread_pollset); |
| 319 | GPR_TLS_DECL(g_current_thread_worker); |
| 320 | static gpr_atm g_active_poller; |
| 321 | static pollset_neighbourhood *g_neighbourhoods; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 322 | static size_t g_num_neighbourhoods; |
Craig Tiller | 67e229e | 2017-05-01 20:57:59 +0000 | [diff] [blame] | 323 | static gpr_mu g_wq_mu; |
| 324 | static grpc_closure_list g_wq_items; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 325 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 326 | /* Return true if first in list */ |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 327 | static bool worker_insert(grpc_pollset *pollset, grpc_pollset_worker *worker) { |
| 328 | if (pollset->root_worker == NULL) { |
| 329 | pollset->root_worker = worker; |
| 330 | worker->next = worker->prev = worker; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 331 | return true; |
| 332 | } else { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 333 | worker->next = pollset->root_worker; |
| 334 | worker->prev = worker->next->prev; |
| 335 | worker->next->prev = worker; |
| 336 | worker->prev->next = worker; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 337 | return false; |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | /* Return true if last in list */ |
| 342 | typedef enum { EMPTIED, NEW_ROOT, REMOVED } worker_remove_result; |
| 343 | |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 344 | static worker_remove_result worker_remove(grpc_pollset *pollset, |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 345 | grpc_pollset_worker *worker) { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 346 | if (worker == pollset->root_worker) { |
| 347 | if (worker == worker->next) { |
| 348 | pollset->root_worker = NULL; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 349 | return EMPTIED; |
| 350 | } else { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 351 | pollset->root_worker = worker->next; |
| 352 | worker->prev->next = worker->next; |
| 353 | worker->next->prev = worker->prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 354 | return NEW_ROOT; |
| 355 | } |
| 356 | } else { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 357 | worker->prev->next = worker->next; |
| 358 | worker->next->prev = worker->prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 359 | return REMOVED; |
| 360 | } |
| 361 | } |
| 362 | |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 363 | static size_t choose_neighbourhood(void) { |
| 364 | return (size_t)gpr_cpu_current_cpu() % g_num_neighbourhoods; |
| 365 | } |
| 366 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 367 | static grpc_error *pollset_global_init(void) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 368 | gpr_tls_init(&g_current_thread_pollset); |
| 369 | gpr_tls_init(&g_current_thread_worker); |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 370 | gpr_atm_no_barrier_store(&g_active_poller, 0); |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 371 | global_wakeup_fd.read_fd = -1; |
| 372 | grpc_error *err = grpc_wakeup_fd_init(&global_wakeup_fd); |
Craig Tiller | 67e229e | 2017-05-01 20:57:59 +0000 | [diff] [blame] | 373 | gpr_mu_init(&g_wq_mu); |
| 374 | g_wq_items = (grpc_closure_list)GRPC_CLOSURE_LIST_INIT; |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 375 | if (err != GRPC_ERROR_NONE) return err; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 376 | struct epoll_event ev = {.events = (uint32_t)(EPOLLIN | EPOLLET), |
| 377 | .data.ptr = &global_wakeup_fd}; |
| 378 | if (epoll_ctl(g_epfd, EPOLL_CTL_ADD, global_wakeup_fd.read_fd, &ev) != 0) { |
| 379 | return GRPC_OS_ERROR(errno, "epoll_ctl"); |
| 380 | } |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 381 | g_num_neighbourhoods = GPR_CLAMP(gpr_cpu_num_cores(), 1, MAX_NEIGHBOURHOODS); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 382 | g_neighbourhoods = |
| 383 | gpr_zalloc(sizeof(*g_neighbourhoods) * g_num_neighbourhoods); |
| 384 | for (size_t i = 0; i < g_num_neighbourhoods; i++) { |
| 385 | gpr_mu_init(&g_neighbourhoods[i].mu); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 386 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 387 | return GRPC_ERROR_NONE; |
| 388 | } |
| 389 | |
| 390 | static void pollset_global_shutdown(void) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 391 | gpr_tls_destroy(&g_current_thread_pollset); |
| 392 | gpr_tls_destroy(&g_current_thread_worker); |
Craig Tiller | 67e229e | 2017-05-01 20:57:59 +0000 | [diff] [blame] | 393 | gpr_mu_destroy(&g_wq_mu); |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 394 | if (global_wakeup_fd.read_fd != -1) grpc_wakeup_fd_destroy(&global_wakeup_fd); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 395 | for (size_t i = 0; i < g_num_neighbourhoods; i++) { |
| 396 | gpr_mu_destroy(&g_neighbourhoods[i].mu); |
| 397 | } |
| 398 | gpr_free(g_neighbourhoods); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 399 | } |
| 400 | |
| 401 | static void pollset_init(grpc_pollset *pollset, gpr_mu **mu) { |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 402 | gpr_mu_init(&pollset->mu); |
| 403 | *mu = &pollset->mu; |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 404 | pollset->neighbourhood = &g_neighbourhoods[choose_neighbourhood()]; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 405 | pollset->seen_inactive = true; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 406 | } |
| 407 | |
Craig Tiller | c610985 | 2017-05-01 14:26:49 -0700 | [diff] [blame] | 408 | static void pollset_destroy(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset) { |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 409 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 410 | if (!pollset->seen_inactive) { |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 411 | pollset_neighbourhood *neighbourhood = pollset->neighbourhood; |
| 412 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | a95bacf | 2017-05-01 12:51:24 -0700 | [diff] [blame] | 413 | retry_lock_neighbourhood: |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 414 | gpr_mu_lock(&neighbourhood->mu); |
| 415 | gpr_mu_lock(&pollset->mu); |
| 416 | if (!pollset->seen_inactive) { |
| 417 | if (pollset->neighbourhood != neighbourhood) { |
| 418 | gpr_mu_unlock(&neighbourhood->mu); |
| 419 | neighbourhood = pollset->neighbourhood; |
| 420 | gpr_mu_unlock(&pollset->mu); |
| 421 | goto retry_lock_neighbourhood; |
| 422 | } |
| 423 | pollset->prev->next = pollset->next; |
| 424 | pollset->next->prev = pollset->prev; |
| 425 | if (pollset == pollset->neighbourhood->active_root) { |
| 426 | pollset->neighbourhood->active_root = |
| 427 | pollset->next == pollset ? NULL : pollset->next; |
| 428 | } |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 429 | } |
| 430 | gpr_mu_unlock(&pollset->neighbourhood->mu); |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 431 | } |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 432 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 433 | gpr_mu_destroy(&pollset->mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 434 | } |
| 435 | |
| 436 | static grpc_error *pollset_kick_all(grpc_pollset *pollset) { |
| 437 | grpc_error *error = GRPC_ERROR_NONE; |
| 438 | if (pollset->root_worker != NULL) { |
| 439 | grpc_pollset_worker *worker = pollset->root_worker; |
| 440 | do { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 441 | switch (worker->kick_state) { |
| 442 | case KICKED: |
| 443 | break; |
| 444 | case UNKICKED: |
| 445 | SET_KICK_STATE(worker, KICKED); |
| 446 | if (worker->initialized_cv) { |
| 447 | gpr_cv_signal(&worker->cv); |
| 448 | } |
| 449 | break; |
| 450 | case DESIGNATED_POLLER: |
| 451 | SET_KICK_STATE(worker, KICKED); |
| 452 | append_error(&error, grpc_wakeup_fd_wakeup(&global_wakeup_fd), |
| 453 | "pollset_shutdown"); |
| 454 | break; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 455 | } |
| 456 | |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 457 | worker = worker->next; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 458 | } while (worker != pollset->root_worker); |
| 459 | } |
| 460 | return error; |
| 461 | } |
| 462 | |
| 463 | static void pollset_maybe_finish_shutdown(grpc_exec_ctx *exec_ctx, |
| 464 | grpc_pollset *pollset) { |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 465 | if (pollset->shutdown_closure != NULL && pollset->root_worker == NULL && |
| 466 | pollset->begin_refs == 0) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 467 | grpc_closure_sched(exec_ctx, pollset->shutdown_closure, GRPC_ERROR_NONE); |
| 468 | pollset->shutdown_closure = NULL; |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | static void pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 473 | grpc_closure *closure) { |
| 474 | GPR_ASSERT(pollset->shutdown_closure == NULL); |
| 475 | pollset->shutdown_closure = closure; |
| 476 | GRPC_LOG_IF_ERROR("pollset_shutdown", pollset_kick_all(pollset)); |
| 477 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
| 478 | } |
| 479 | |
Craig Tiller | a95bacf | 2017-05-01 12:51:24 -0700 | [diff] [blame] | 480 | #define MAX_EPOLL_EVENTS 100 |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 481 | |
| 482 | static int poll_deadline_to_millis_timeout(gpr_timespec deadline, |
| 483 | gpr_timespec now) { |
| 484 | gpr_timespec timeout; |
| 485 | if (gpr_time_cmp(deadline, gpr_inf_future(deadline.clock_type)) == 0) { |
| 486 | return -1; |
| 487 | } |
| 488 | |
| 489 | if (gpr_time_cmp(deadline, now) <= 0) { |
| 490 | return 0; |
| 491 | } |
| 492 | |
| 493 | static const gpr_timespec round_up = { |
| 494 | .clock_type = GPR_TIMESPAN, .tv_sec = 0, .tv_nsec = GPR_NS_PER_MS - 1}; |
| 495 | timeout = gpr_time_sub(deadline, now); |
| 496 | int millis = gpr_time_to_millis(gpr_time_add(timeout, round_up)); |
| 497 | return millis >= 1 ? millis : 1; |
| 498 | } |
| 499 | |
| 500 | static grpc_error *pollset_epoll(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 501 | gpr_timespec now, gpr_timespec deadline) { |
| 502 | struct epoll_event events[MAX_EPOLL_EVENTS]; |
| 503 | static const char *err_desc = "pollset_poll"; |
| 504 | |
| 505 | int timeout = poll_deadline_to_millis_timeout(deadline, now); |
| 506 | |
| 507 | if (timeout != 0) { |
| 508 | GRPC_SCHEDULING_START_BLOCKING_REGION; |
| 509 | } |
| 510 | int r; |
| 511 | do { |
| 512 | r = epoll_wait(g_epfd, events, MAX_EPOLL_EVENTS, timeout); |
| 513 | } while (r < 0 && errno == EINTR); |
| 514 | if (timeout != 0) { |
| 515 | GRPC_SCHEDULING_END_BLOCKING_REGION; |
| 516 | } |
| 517 | |
| 518 | if (r < 0) return GRPC_OS_ERROR(errno, "epoll_wait"); |
| 519 | |
| 520 | grpc_error *error = GRPC_ERROR_NONE; |
| 521 | for (int i = 0; i < r; i++) { |
| 522 | void *data_ptr = events[i].data.ptr; |
| 523 | if (data_ptr == &global_wakeup_fd) { |
Craig Tiller | 67e229e | 2017-05-01 20:57:59 +0000 | [diff] [blame] | 524 | gpr_mu_lock(&g_wq_mu); |
| 525 | grpc_closure_list_move(&g_wq_items, &exec_ctx->closure_list); |
| 526 | gpr_mu_unlock(&g_wq_mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 527 | append_error(&error, grpc_wakeup_fd_consume_wakeup(&global_wakeup_fd), |
| 528 | err_desc); |
| 529 | } else { |
| 530 | grpc_fd *fd = (grpc_fd *)(data_ptr); |
| 531 | bool cancel = (events[i].events & (EPOLLERR | EPOLLHUP)) != 0; |
| 532 | bool read_ev = (events[i].events & (EPOLLIN | EPOLLPRI)) != 0; |
| 533 | bool write_ev = (events[i].events & EPOLLOUT) != 0; |
| 534 | if (read_ev || cancel) { |
| 535 | fd_become_readable(exec_ctx, fd, pollset); |
| 536 | } |
| 537 | if (write_ev || cancel) { |
| 538 | fd_become_writable(exec_ctx, fd); |
| 539 | } |
| 540 | } |
| 541 | } |
| 542 | |
| 543 | return error; |
| 544 | } |
| 545 | |
| 546 | static bool begin_worker(grpc_pollset *pollset, grpc_pollset_worker *worker, |
| 547 | grpc_pollset_worker **worker_hdl, gpr_timespec *now, |
| 548 | gpr_timespec deadline) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 549 | if (worker_hdl != NULL) *worker_hdl = worker; |
| 550 | worker->initialized_cv = false; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 551 | SET_KICK_STATE(worker, UNKICKED); |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 552 | worker->schedule_on_end_work = (grpc_closure_list)GRPC_CLOSURE_LIST_INIT; |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 553 | pollset->begin_refs++; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 554 | |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 555 | if (pollset->seen_inactive) { |
| 556 | // pollset has been observed to be inactive, we need to move back to the |
| 557 | // active list |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 558 | bool is_reassigning = false; |
| 559 | if (!pollset->reassigning_neighbourhood) { |
| 560 | is_reassigning = true; |
| 561 | pollset->reassigning_neighbourhood = true; |
| 562 | pollset->neighbourhood = &g_neighbourhoods[choose_neighbourhood()]; |
| 563 | } |
| 564 | pollset_neighbourhood *neighbourhood = pollset->neighbourhood; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 565 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 566 | // pollset unlocked: state may change (even worker->kick_state) |
| 567 | retry_lock_neighbourhood: |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 568 | gpr_mu_lock(&neighbourhood->mu); |
| 569 | gpr_mu_lock(&pollset->mu); |
| 570 | if (pollset->seen_inactive) { |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 571 | if (neighbourhood != pollset->neighbourhood) { |
| 572 | gpr_mu_unlock(&neighbourhood->mu); |
| 573 | neighbourhood = pollset->neighbourhood; |
| 574 | gpr_mu_unlock(&pollset->mu); |
| 575 | goto retry_lock_neighbourhood; |
| 576 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 577 | pollset->seen_inactive = false; |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 578 | if (neighbourhood->active_root == NULL) { |
| 579 | neighbourhood->active_root = pollset->next = pollset->prev = pollset; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 580 | if (worker->kick_state == UNKICKED && |
| 581 | gpr_atm_no_barrier_cas(&g_active_poller, 0, (gpr_atm)worker)) { |
| 582 | SET_KICK_STATE(worker, DESIGNATED_POLLER); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 583 | } |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 584 | } else { |
| 585 | pollset->next = neighbourhood->active_root; |
| 586 | pollset->prev = pollset->next->prev; |
| 587 | pollset->next->prev = pollset->prev->next = pollset; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 588 | } |
| 589 | } |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 590 | if (is_reassigning) { |
| 591 | GPR_ASSERT(pollset->reassigning_neighbourhood); |
| 592 | pollset->reassigning_neighbourhood = false; |
| 593 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 594 | gpr_mu_unlock(&neighbourhood->mu); |
| 595 | } |
| 596 | worker_insert(pollset, worker); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 597 | pollset->begin_refs--; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 598 | if (worker->kick_state == UNKICKED) { |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 599 | GPR_ASSERT(gpr_atm_no_barrier_load(&g_active_poller) != (gpr_atm)worker); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 600 | worker->initialized_cv = true; |
| 601 | gpr_cv_init(&worker->cv); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 602 | while (worker->kick_state == UNKICKED && |
| 603 | pollset->shutdown_closure == NULL) { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 604 | if (gpr_cv_wait(&worker->cv, &pollset->mu, deadline) && |
| 605 | worker->kick_state == UNKICKED) { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 606 | SET_KICK_STATE(worker, KICKED); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 607 | } |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 608 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 609 | *now = gpr_now(now->clock_type); |
| 610 | } |
| 611 | |
Craig Tiller | 43bf259 | 2017-04-28 23:21:01 +0000 | [diff] [blame] | 612 | return worker->kick_state == DESIGNATED_POLLER && |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 613 | pollset->shutdown_closure == NULL; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 614 | } |
| 615 | |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 616 | static bool check_neighbourhood_for_available_poller( |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 617 | pollset_neighbourhood *neighbourhood) { |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 618 | bool found_worker = false; |
| 619 | do { |
| 620 | grpc_pollset *inspect = neighbourhood->active_root; |
| 621 | if (inspect == NULL) { |
| 622 | break; |
| 623 | } |
| 624 | gpr_mu_lock(&inspect->mu); |
| 625 | GPR_ASSERT(!inspect->seen_inactive); |
| 626 | grpc_pollset_worker *inspect_worker = inspect->root_worker; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 627 | if (inspect_worker != NULL) { |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 628 | do { |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 629 | switch (inspect_worker->kick_state) { |
| 630 | case UNKICKED: |
| 631 | if (gpr_atm_no_barrier_cas(&g_active_poller, 0, |
| 632 | (gpr_atm)inspect_worker)) { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 633 | SET_KICK_STATE(inspect_worker, DESIGNATED_POLLER); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 634 | if (inspect_worker->initialized_cv) { |
| 635 | gpr_cv_signal(&inspect_worker->cv); |
| 636 | } |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 637 | } |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 638 | // even if we didn't win the cas, there's a worker, we can stop |
| 639 | found_worker = true; |
| 640 | break; |
| 641 | case KICKED: |
| 642 | break; |
| 643 | case DESIGNATED_POLLER: |
| 644 | found_worker = true; // ok, so someone else found the worker, but |
| 645 | // we'll accept that |
| 646 | break; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 647 | } |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 648 | inspect_worker = inspect_worker->next; |
| 649 | } while (inspect_worker != inspect->root_worker); |
| 650 | } |
| 651 | if (!found_worker) { |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 652 | inspect->seen_inactive = true; |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 653 | if (inspect == neighbourhood->active_root) { |
Craig Tiller | a95bacf | 2017-05-01 12:51:24 -0700 | [diff] [blame] | 654 | neighbourhood->active_root = |
| 655 | inspect->next == inspect ? NULL : inspect->next; |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 656 | } |
| 657 | inspect->next->prev = inspect->prev; |
| 658 | inspect->prev->next = inspect->next; |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 659 | inspect->next = inspect->prev = NULL; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 660 | } |
| 661 | gpr_mu_unlock(&inspect->mu); |
| 662 | } while (!found_worker); |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 663 | return found_worker; |
| 664 | } |
| 665 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 666 | static void end_worker(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 667 | grpc_pollset_worker *worker, |
| 668 | grpc_pollset_worker **worker_hdl) { |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 669 | if (worker_hdl != NULL) *worker_hdl = NULL; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 670 | SET_KICK_STATE(worker, KICKED); |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 671 | grpc_closure_list_move(&worker->schedule_on_end_work, |
| 672 | &exec_ctx->closure_list); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 673 | if (gpr_atm_no_barrier_load(&g_active_poller) == (gpr_atm)worker) { |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 674 | if (worker->next != worker && worker->next->kick_state == UNKICKED) { |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 675 | GPR_ASSERT(worker->next->initialized_cv); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 676 | gpr_atm_no_barrier_store(&g_active_poller, (gpr_atm)worker->next); |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 677 | SET_KICK_STATE(worker->next, DESIGNATED_POLLER); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 678 | gpr_cv_signal(&worker->next->cv); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 679 | if (grpc_exec_ctx_has_work(exec_ctx)) { |
| 680 | gpr_mu_unlock(&pollset->mu); |
| 681 | grpc_exec_ctx_flush(exec_ctx); |
| 682 | gpr_mu_lock(&pollset->mu); |
| 683 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 684 | } else { |
| 685 | gpr_atm_no_barrier_store(&g_active_poller, 0); |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 686 | size_t poller_neighbourhood_idx = |
| 687 | (size_t)(pollset->neighbourhood - g_neighbourhoods); |
Craig Tiller | bb74267 | 2017-05-17 22:19:05 +0000 | [diff] [blame] | 688 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 689 | bool found_worker = false; |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 690 | bool scan_state[MAX_NEIGHBOURHOODS]; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 691 | for (size_t i = 0; !found_worker && i < g_num_neighbourhoods; i++) { |
| 692 | pollset_neighbourhood *neighbourhood = |
| 693 | &g_neighbourhoods[(poller_neighbourhood_idx + i) % |
| 694 | g_num_neighbourhoods]; |
| 695 | if (gpr_mu_trylock(&neighbourhood->mu)) { |
| 696 | found_worker = |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 697 | check_neighbourhood_for_available_poller(neighbourhood); |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 698 | gpr_mu_unlock(&neighbourhood->mu); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 699 | scan_state[i] = true; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 700 | } else { |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 701 | scan_state[i] = false; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 702 | } |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 703 | } |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 704 | for (size_t i = 0; !found_worker && i < g_num_neighbourhoods; i++) { |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 705 | if (scan_state[i]) continue; |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 706 | pollset_neighbourhood *neighbourhood = |
| 707 | &g_neighbourhoods[(poller_neighbourhood_idx + i) % |
| 708 | g_num_neighbourhoods]; |
| 709 | gpr_mu_lock(&neighbourhood->mu); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 710 | found_worker = check_neighbourhood_for_available_poller(neighbourhood); |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 711 | gpr_mu_unlock(&neighbourhood->mu); |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 712 | } |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 713 | grpc_exec_ctx_flush(exec_ctx); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 714 | gpr_mu_lock(&pollset->mu); |
| 715 | } |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 716 | } else if (grpc_exec_ctx_has_work(exec_ctx)) { |
| 717 | gpr_mu_unlock(&pollset->mu); |
| 718 | grpc_exec_ctx_flush(exec_ctx); |
| 719 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 720 | } |
| 721 | if (worker->initialized_cv) { |
| 722 | gpr_cv_destroy(&worker->cv); |
| 723 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 724 | if (EMPTIED == worker_remove(pollset, worker)) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 725 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
| 726 | } |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 727 | GPR_ASSERT(gpr_atm_no_barrier_load(&g_active_poller) != (gpr_atm)worker); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 728 | } |
| 729 | |
| 730 | /* pollset->po.mu lock must be held by the caller before calling this. |
| 731 | The function pollset_work() may temporarily release the lock (pollset->po.mu) |
| 732 | during the course of its execution but it will always re-acquire the lock and |
| 733 | ensure that it is held by the time the function returns */ |
| 734 | static grpc_error *pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 735 | grpc_pollset_worker **worker_hdl, |
| 736 | gpr_timespec now, gpr_timespec deadline) { |
| 737 | grpc_pollset_worker worker; |
| 738 | grpc_error *error = GRPC_ERROR_NONE; |
| 739 | static const char *err_desc = "pollset_work"; |
| 740 | if (pollset->kicked_without_poller) { |
| 741 | pollset->kicked_without_poller = false; |
| 742 | return GRPC_ERROR_NONE; |
| 743 | } |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 744 | gpr_tls_set(&g_current_thread_pollset, (intptr_t)pollset); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 745 | if (begin_worker(pollset, &worker, worker_hdl, &now, deadline)) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 746 | gpr_tls_set(&g_current_thread_worker, (intptr_t)&worker); |
| 747 | GPR_ASSERT(!pollset->shutdown_closure); |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 748 | GPR_ASSERT(!pollset->seen_inactive); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 749 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 750 | append_error(&error, pollset_epoll(exec_ctx, pollset, now, deadline), |
| 751 | err_desc); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 752 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 753 | gpr_tls_set(&g_current_thread_worker, 0); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 754 | } |
| 755 | end_worker(exec_ctx, pollset, &worker, worker_hdl); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 756 | gpr_tls_set(&g_current_thread_pollset, 0); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 757 | return error; |
| 758 | } |
| 759 | |
| 760 | static grpc_error *pollset_kick(grpc_pollset *pollset, |
| 761 | grpc_pollset_worker *specific_worker) { |
| 762 | if (specific_worker == NULL) { |
| 763 | if (gpr_tls_get(&g_current_thread_pollset) != (intptr_t)pollset) { |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 764 | grpc_pollset_worker *root_worker = pollset->root_worker; |
| 765 | if (root_worker == NULL) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 766 | pollset->kicked_without_poller = true; |
| 767 | return GRPC_ERROR_NONE; |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 768 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 769 | grpc_pollset_worker *next_worker = root_worker->next; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 770 | if (root_worker == next_worker && // only try and wake up a poller if |
| 771 | // there is no next worker |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 772 | root_worker == (grpc_pollset_worker *)gpr_atm_no_barrier_load( |
| 773 | &g_active_poller)) { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 774 | SET_KICK_STATE(root_worker, KICKED); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 775 | return grpc_wakeup_fd_wakeup(&global_wakeup_fd); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 776 | } else if (next_worker->kick_state == UNKICKED) { |
| 777 | GPR_ASSERT(next_worker->initialized_cv); |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 778 | SET_KICK_STATE(next_worker, KICKED); |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 779 | gpr_cv_signal(&next_worker->cv); |
| 780 | return GRPC_ERROR_NONE; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 781 | } else if (next_worker->kick_state == DESIGNATED_POLLER) { |
| 782 | if (root_worker->kick_state != DESIGNATED_POLLER) { |
| 783 | SET_KICK_STATE(root_worker, KICKED); |
| 784 | if (root_worker->initialized_cv) { |
| 785 | gpr_cv_signal(&root_worker->cv); |
| 786 | } |
| 787 | return GRPC_ERROR_NONE; |
| 788 | } else { |
| 789 | SET_KICK_STATE(next_worker, KICKED); |
| 790 | return grpc_wakeup_fd_wakeup(&global_wakeup_fd); |
| 791 | } |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 792 | } else { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 793 | GPR_ASSERT(next_worker->kick_state == KICKED); |
| 794 | SET_KICK_STATE(next_worker, KICKED); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 795 | return GRPC_ERROR_NONE; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 796 | } |
| 797 | } else { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 798 | GPR_ASSERT(false); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 799 | return GRPC_ERROR_NONE; |
| 800 | } |
Craig Tiller | 43bf259 | 2017-04-28 23:21:01 +0000 | [diff] [blame] | 801 | } else if (specific_worker->kick_state == KICKED) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 802 | return GRPC_ERROR_NONE; |
| 803 | } else if (gpr_tls_get(&g_current_thread_worker) == |
| 804 | (intptr_t)specific_worker) { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 805 | SET_KICK_STATE(specific_worker, KICKED); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 806 | return GRPC_ERROR_NONE; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 807 | } else if (specific_worker == |
| 808 | (grpc_pollset_worker *)gpr_atm_no_barrier_load(&g_active_poller)) { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 809 | SET_KICK_STATE(specific_worker, KICKED); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 810 | return grpc_wakeup_fd_wakeup(&global_wakeup_fd); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 811 | } else if (specific_worker->initialized_cv) { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 812 | SET_KICK_STATE(specific_worker, KICKED); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 813 | gpr_cv_signal(&specific_worker->cv); |
| 814 | return GRPC_ERROR_NONE; |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 815 | } else { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 816 | SET_KICK_STATE(specific_worker, KICKED); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 817 | return GRPC_ERROR_NONE; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 818 | } |
| 819 | } |
| 820 | |
| 821 | static void pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 822 | grpc_fd *fd) {} |
| 823 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 824 | /******************************************************************************* |
| 825 | * Workqueue Definitions |
| 826 | */ |
| 827 | |
| 828 | #ifdef GRPC_WORKQUEUE_REFCOUNT_DEBUG |
| 829 | static grpc_workqueue *workqueue_ref(grpc_workqueue *workqueue, |
| 830 | const char *file, int line, |
| 831 | const char *reason) { |
| 832 | return workqueue; |
| 833 | } |
| 834 | |
| 835 | static void workqueue_unref(grpc_exec_ctx *exec_ctx, grpc_workqueue *workqueue, |
| 836 | const char *file, int line, const char *reason) {} |
| 837 | #else |
| 838 | static grpc_workqueue *workqueue_ref(grpc_workqueue *workqueue) { |
| 839 | return workqueue; |
| 840 | } |
| 841 | |
| 842 | static void workqueue_unref(grpc_exec_ctx *exec_ctx, |
| 843 | grpc_workqueue *workqueue) {} |
| 844 | #endif |
| 845 | |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 846 | static void wq_sched(grpc_exec_ctx *exec_ctx, grpc_closure *closure, |
| 847 | grpc_error *error) { |
| 848 | // find a neighbourhood to wakeup |
| 849 | bool scheduled = false; |
| 850 | size_t initial_neighbourhood = choose_neighbourhood(); |
| 851 | for (size_t i = 0; !scheduled && i < g_num_neighbourhoods; i++) { |
| 852 | pollset_neighbourhood *neighbourhood = |
| 853 | &g_neighbourhoods[(initial_neighbourhood + i) % g_num_neighbourhoods]; |
| 854 | if (gpr_mu_trylock(&neighbourhood->mu)) { |
| 855 | if (neighbourhood->active_root != NULL) { |
| 856 | grpc_pollset *inspect = neighbourhood->active_root; |
| 857 | do { |
| 858 | if (gpr_mu_trylock(&inspect->mu)) { |
| 859 | if (inspect->root_worker != NULL) { |
| 860 | grpc_pollset_worker *inspect_worker = inspect->root_worker; |
| 861 | do { |
| 862 | if (inspect_worker->kick_state == UNKICKED) { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame^] | 863 | SET_KICK_STATE(inspect_worker, KICKED); |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 864 | grpc_closure_list_append( |
| 865 | &inspect_worker->schedule_on_end_work, closure, error); |
| 866 | if (inspect_worker->initialized_cv) { |
| 867 | gpr_cv_signal(&inspect_worker->cv); |
| 868 | } |
| 869 | scheduled = true; |
| 870 | } |
| 871 | inspect_worker = inspect_worker->next; |
| 872 | } while (!scheduled && inspect_worker != inspect->root_worker); |
| 873 | } |
| 874 | gpr_mu_unlock(&inspect->mu); |
| 875 | } |
| 876 | inspect = inspect->next; |
| 877 | } while (!scheduled && inspect != neighbourhood->active_root); |
| 878 | } |
| 879 | gpr_mu_unlock(&neighbourhood->mu); |
| 880 | } |
| 881 | } |
| 882 | if (!scheduled) { |
Craig Tiller | 67e229e | 2017-05-01 20:57:59 +0000 | [diff] [blame] | 883 | gpr_mu_lock(&g_wq_mu); |
| 884 | grpc_closure_list_append(&g_wq_items, closure, error); |
| 885 | gpr_mu_unlock(&g_wq_mu); |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 886 | GRPC_LOG_IF_ERROR("workqueue_scheduler", |
| 887 | grpc_wakeup_fd_wakeup(&global_wakeup_fd)); |
| 888 | } |
| 889 | } |
| 890 | |
| 891 | static const grpc_closure_scheduler_vtable |
| 892 | singleton_workqueue_scheduler_vtable = {wq_sched, wq_sched, |
| 893 | "epoll1_workqueue"}; |
| 894 | |
| 895 | static grpc_closure_scheduler singleton_workqueue_scheduler = { |
| 896 | &singleton_workqueue_scheduler_vtable}; |
| 897 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 898 | static grpc_closure_scheduler *workqueue_scheduler(grpc_workqueue *workqueue) { |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 899 | return &singleton_workqueue_scheduler; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 900 | } |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 901 | |
| 902 | /******************************************************************************* |
| 903 | * Pollset-set Definitions |
| 904 | */ |
| 905 | |
| 906 | static grpc_pollset_set *pollset_set_create(void) { |
| 907 | return (grpc_pollset_set *)((intptr_t)0xdeafbeef); |
| 908 | } |
| 909 | |
| 910 | static void pollset_set_destroy(grpc_exec_ctx *exec_ctx, |
| 911 | grpc_pollset_set *pss) {} |
| 912 | |
| 913 | static void pollset_set_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset_set *pss, |
| 914 | grpc_fd *fd) {} |
| 915 | |
| 916 | static void pollset_set_del_fd(grpc_exec_ctx *exec_ctx, grpc_pollset_set *pss, |
| 917 | grpc_fd *fd) {} |
| 918 | |
| 919 | static void pollset_set_add_pollset(grpc_exec_ctx *exec_ctx, |
| 920 | grpc_pollset_set *pss, grpc_pollset *ps) {} |
| 921 | |
| 922 | static void pollset_set_del_pollset(grpc_exec_ctx *exec_ctx, |
| 923 | grpc_pollset_set *pss, grpc_pollset *ps) {} |
| 924 | |
| 925 | static void pollset_set_add_pollset_set(grpc_exec_ctx *exec_ctx, |
| 926 | grpc_pollset_set *bag, |
| 927 | grpc_pollset_set *item) {} |
| 928 | |
| 929 | static void pollset_set_del_pollset_set(grpc_exec_ctx *exec_ctx, |
| 930 | grpc_pollset_set *bag, |
| 931 | grpc_pollset_set *item) {} |
| 932 | |
| 933 | /******************************************************************************* |
| 934 | * Event engine binding |
| 935 | */ |
| 936 | |
| 937 | static void shutdown_engine(void) { |
| 938 | fd_global_shutdown(); |
| 939 | pollset_global_shutdown(); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 940 | } |
| 941 | |
| 942 | static const grpc_event_engine_vtable vtable = { |
| 943 | .pollset_size = sizeof(grpc_pollset), |
| 944 | |
| 945 | .fd_create = fd_create, |
| 946 | .fd_wrapped_fd = fd_wrapped_fd, |
| 947 | .fd_orphan = fd_orphan, |
| 948 | .fd_shutdown = fd_shutdown, |
| 949 | .fd_is_shutdown = fd_is_shutdown, |
| 950 | .fd_notify_on_read = fd_notify_on_read, |
| 951 | .fd_notify_on_write = fd_notify_on_write, |
| 952 | .fd_get_read_notifier_pollset = fd_get_read_notifier_pollset, |
| 953 | .fd_get_workqueue = fd_get_workqueue, |
| 954 | |
| 955 | .pollset_init = pollset_init, |
| 956 | .pollset_shutdown = pollset_shutdown, |
| 957 | .pollset_destroy = pollset_destroy, |
| 958 | .pollset_work = pollset_work, |
| 959 | .pollset_kick = pollset_kick, |
| 960 | .pollset_add_fd = pollset_add_fd, |
| 961 | |
| 962 | .pollset_set_create = pollset_set_create, |
| 963 | .pollset_set_destroy = pollset_set_destroy, |
| 964 | .pollset_set_add_pollset = pollset_set_add_pollset, |
| 965 | .pollset_set_del_pollset = pollset_set_del_pollset, |
| 966 | .pollset_set_add_pollset_set = pollset_set_add_pollset_set, |
| 967 | .pollset_set_del_pollset_set = pollset_set_del_pollset_set, |
| 968 | .pollset_set_add_fd = pollset_set_add_fd, |
| 969 | .pollset_set_del_fd = pollset_set_del_fd, |
| 970 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 971 | .workqueue_ref = workqueue_ref, |
| 972 | .workqueue_unref = workqueue_unref, |
| 973 | .workqueue_scheduler = workqueue_scheduler, |
| 974 | |
| 975 | .shutdown_engine = shutdown_engine, |
| 976 | }; |
| 977 | |
| 978 | /* It is possible that GLIBC has epoll but the underlying kernel doesn't. |
| 979 | * Create a dummy epoll_fd to make sure epoll support is available */ |
Craig Tiller | 6f0af49 | 2017-04-27 19:26:16 +0000 | [diff] [blame] | 980 | const grpc_event_engine_vtable *grpc_init_epoll1_linux(bool explicit_request) { |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 981 | if (!grpc_has_wakeup_fd()) { |
| 982 | return NULL; |
| 983 | } |
| 984 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 985 | g_epfd = epoll_create1(EPOLL_CLOEXEC); |
| 986 | if (g_epfd < 0) { |
| 987 | gpr_log(GPR_ERROR, "epoll unavailable"); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 988 | return NULL; |
| 989 | } |
| 990 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 991 | fd_global_init(); |
| 992 | |
| 993 | if (!GRPC_LOG_IF_ERROR("pollset_global_init", pollset_global_init())) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 994 | close(g_epfd); |
| 995 | fd_global_shutdown(); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 996 | return NULL; |
| 997 | } |
| 998 | |
| 999 | return &vtable; |
| 1000 | } |
| 1001 | |
| 1002 | #else /* defined(GRPC_LINUX_EPOLL) */ |
| 1003 | #if defined(GRPC_POSIX_SOCKET) |
| 1004 | #include "src/core/lib/iomgr/ev_posix.h" |
| 1005 | /* If GRPC_LINUX_EPOLL is not defined, it means epoll is not available. Return |
| 1006 | * NULL */ |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 1007 | const grpc_event_engine_vtable *grpc_init_epoll1_linux(bool explicit_request) { |
| 1008 | return NULL; |
| 1009 | } |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1010 | #endif /* defined(GRPC_POSIX_SOCKET) */ |
| 1011 | #endif /* !defined(GRPC_LINUX_EPOLL) */ |