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" |
Craig Tiller | b89bac0 | 2017-05-26 15:20:32 +0000 | [diff] [blame] | 64 | #include "src/core/lib/support/string.h" |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 65 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 66 | static grpc_wakeup_fd global_wakeup_fd; |
| 67 | static int g_epfd; |
| 68 | |
| 69 | /******************************************************************************* |
| 70 | * Fd Declarations |
| 71 | */ |
| 72 | |
| 73 | struct grpc_fd { |
| 74 | int fd; |
| 75 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 76 | gpr_atm read_closure; |
| 77 | gpr_atm write_closure; |
| 78 | |
| 79 | struct grpc_fd *freelist_next; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 80 | |
| 81 | /* The pollset that last noticed that the fd is readable. The actual type |
| 82 | * stored in this is (grpc_pollset *) */ |
| 83 | gpr_atm read_notifier_pollset; |
| 84 | |
| 85 | grpc_iomgr_object iomgr_object; |
| 86 | }; |
| 87 | |
| 88 | static void fd_global_init(void); |
| 89 | static void fd_global_shutdown(void); |
| 90 | |
| 91 | /******************************************************************************* |
| 92 | * Pollset Declarations |
| 93 | */ |
| 94 | |
Craig Tiller | 43bf259 | 2017-04-28 23:21:01 +0000 | [diff] [blame] | 95 | typedef enum { UNKICKED, KICKED, DESIGNATED_POLLER } kick_state; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 96 | |
| 97 | struct grpc_pollset_worker { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 98 | kick_state kick_state; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 99 | int kick_state_mutator; // which line of code last changed kick state |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 100 | bool initialized_cv; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 101 | grpc_pollset_worker *next; |
| 102 | grpc_pollset_worker *prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 103 | gpr_cv cv; |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 104 | grpc_closure_list schedule_on_end_work; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 105 | }; |
| 106 | |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 107 | #define SET_KICK_STATE(worker, state) \ |
| 108 | do { \ |
| 109 | (worker)->kick_state = (state); \ |
| 110 | (worker)->kick_state_mutator = __LINE__; \ |
| 111 | } while (false) |
| 112 | |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 113 | #define MAX_NEIGHBOURHOODS 1024 |
| 114 | |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 115 | typedef struct pollset_neighbourhood { |
| 116 | gpr_mu mu; |
| 117 | grpc_pollset *active_root; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 118 | char pad[GPR_CACHELINE_SIZE]; |
| 119 | } pollset_neighbourhood; |
| 120 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 121 | struct grpc_pollset { |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 122 | gpr_mu mu; |
| 123 | pollset_neighbourhood *neighbourhood; |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 124 | bool reassigning_neighbourhood; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 125 | grpc_pollset_worker *root_worker; |
| 126 | bool kicked_without_poller; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 127 | bool seen_inactive; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 128 | bool shutting_down; /* Is the pollset shutting down ? */ |
| 129 | bool finish_shutdown_called; /* Is the 'finish_shutdown_locked()' called ? */ |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 130 | grpc_closure *shutdown_closure; /* Called after after shutdown is complete */ |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 131 | int begin_refs; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 132 | |
| 133 | grpc_pollset *next; |
| 134 | grpc_pollset *prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 135 | }; |
| 136 | |
| 137 | /******************************************************************************* |
| 138 | * Pollset-set Declarations |
| 139 | */ |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 140 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 141 | struct grpc_pollset_set {}; |
| 142 | |
| 143 | /******************************************************************************* |
| 144 | * Common helpers |
| 145 | */ |
| 146 | |
| 147 | static bool append_error(grpc_error **composite, grpc_error *error, |
| 148 | const char *desc) { |
| 149 | if (error == GRPC_ERROR_NONE) return true; |
| 150 | if (*composite == GRPC_ERROR_NONE) { |
| 151 | *composite = GRPC_ERROR_CREATE_FROM_COPIED_STRING(desc); |
| 152 | } |
| 153 | *composite = grpc_error_add_child(*composite, error); |
| 154 | return false; |
| 155 | } |
| 156 | |
| 157 | /******************************************************************************* |
| 158 | * Fd Definitions |
| 159 | */ |
| 160 | |
| 161 | /* We need to keep a freelist not because of any concerns of malloc performance |
| 162 | * but instead so that implementations with multiple threads in (for example) |
| 163 | * epoll_wait deal with the race between pollset removal and incoming poll |
| 164 | * notifications. |
| 165 | * |
| 166 | * The problem is that the poller ultimately holds a reference to this |
| 167 | * object, so it is very difficult to know when is safe to free it, at least |
| 168 | * without some expensive synchronization. |
| 169 | * |
| 170 | * If we keep the object freelisted, in the worst case losing this race just |
| 171 | * becomes a spurious read notification on a reused fd. |
| 172 | */ |
| 173 | |
| 174 | /* The alarm system needs to be able to wakeup 'some poller' sometimes |
| 175 | * (specifically when a new alarm needs to be triggered earlier than the next |
| 176 | * alarm 'epoch'). This wakeup_fd gives us something to alert on when such a |
| 177 | * case occurs. */ |
| 178 | |
| 179 | static grpc_fd *fd_freelist = NULL; |
| 180 | static gpr_mu fd_freelist_mu; |
| 181 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 182 | static void fd_global_init(void) { gpr_mu_init(&fd_freelist_mu); } |
| 183 | |
| 184 | static void fd_global_shutdown(void) { |
| 185 | gpr_mu_lock(&fd_freelist_mu); |
| 186 | gpr_mu_unlock(&fd_freelist_mu); |
| 187 | while (fd_freelist != NULL) { |
| 188 | grpc_fd *fd = fd_freelist; |
| 189 | fd_freelist = fd_freelist->freelist_next; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 190 | gpr_free(fd); |
| 191 | } |
| 192 | gpr_mu_destroy(&fd_freelist_mu); |
| 193 | } |
| 194 | |
| 195 | static grpc_fd *fd_create(int fd, const char *name) { |
| 196 | grpc_fd *new_fd = NULL; |
| 197 | |
| 198 | gpr_mu_lock(&fd_freelist_mu); |
| 199 | if (fd_freelist != NULL) { |
| 200 | new_fd = fd_freelist; |
| 201 | fd_freelist = fd_freelist->freelist_next; |
| 202 | } |
| 203 | gpr_mu_unlock(&fd_freelist_mu); |
| 204 | |
| 205 | if (new_fd == NULL) { |
| 206 | new_fd = gpr_malloc(sizeof(grpc_fd)); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 207 | } |
| 208 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 209 | new_fd->fd = fd; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 210 | grpc_lfev_init(&new_fd->read_closure); |
| 211 | grpc_lfev_init(&new_fd->write_closure); |
| 212 | gpr_atm_no_barrier_store(&new_fd->read_notifier_pollset, (gpr_atm)NULL); |
| 213 | |
| 214 | new_fd->freelist_next = NULL; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 215 | |
| 216 | char *fd_name; |
| 217 | gpr_asprintf(&fd_name, "%s fd=%d", name, fd); |
| 218 | grpc_iomgr_register_object(&new_fd->iomgr_object, fd_name); |
| 219 | #ifdef GRPC_FD_REF_COUNT_DEBUG |
| 220 | gpr_log(GPR_DEBUG, "FD %d %p create %s", fd, (void *)new_fd, fd_name); |
| 221 | #endif |
| 222 | gpr_free(fd_name); |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 223 | |
| 224 | struct epoll_event ev = {.events = (uint32_t)(EPOLLIN | EPOLLOUT | EPOLLET), |
| 225 | .data.ptr = new_fd}; |
| 226 | if (epoll_ctl(g_epfd, EPOLL_CTL_ADD, fd, &ev) != 0) { |
| 227 | gpr_log(GPR_ERROR, "epoll_ctl failed: %s", strerror(errno)); |
| 228 | } |
| 229 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 230 | return new_fd; |
| 231 | } |
| 232 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 233 | static int fd_wrapped_fd(grpc_fd *fd) { return fd->fd; } |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 234 | |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 235 | /* Might be called multiple times */ |
| 236 | static void fd_shutdown(grpc_exec_ctx *exec_ctx, grpc_fd *fd, grpc_error *why) { |
| 237 | if (grpc_lfev_set_shutdown(exec_ctx, &fd->read_closure, |
| 238 | GRPC_ERROR_REF(why))) { |
| 239 | shutdown(fd->fd, SHUT_RDWR); |
| 240 | grpc_lfev_set_shutdown(exec_ctx, &fd->write_closure, GRPC_ERROR_REF(why)); |
| 241 | } |
| 242 | GRPC_ERROR_UNREF(why); |
| 243 | } |
| 244 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 245 | static void fd_orphan(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 246 | grpc_closure *on_done, int *release_fd, |
| 247 | const char *reason) { |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 248 | grpc_error *error = GRPC_ERROR_NONE; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 249 | |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 250 | if (!grpc_lfev_is_shutdown(&fd->read_closure)) { |
| 251 | fd_shutdown(exec_ctx, fd, GRPC_ERROR_CREATE_FROM_COPIED_STRING(reason)); |
| 252 | } |
| 253 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 254 | /* If release_fd is not NULL, we should be relinquishing control of the file |
| 255 | descriptor fd->fd (but we still own the grpc_fd structure). */ |
| 256 | if (release_fd != NULL) { |
| 257 | *release_fd = fd->fd; |
| 258 | } else { |
| 259 | close(fd->fd); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 260 | } |
| 261 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 262 | grpc_closure_sched(exec_ctx, on_done, GRPC_ERROR_REF(error)); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 263 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 264 | grpc_iomgr_unregister_object(&fd->iomgr_object); |
| 265 | grpc_lfev_destroy(&fd->read_closure); |
| 266 | grpc_lfev_destroy(&fd->write_closure); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 267 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 268 | gpr_mu_lock(&fd_freelist_mu); |
| 269 | fd->freelist_next = fd_freelist; |
| 270 | fd_freelist = fd; |
| 271 | gpr_mu_unlock(&fd_freelist_mu); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | static grpc_pollset *fd_get_read_notifier_pollset(grpc_exec_ctx *exec_ctx, |
| 275 | grpc_fd *fd) { |
| 276 | gpr_atm notifier = gpr_atm_acq_load(&fd->read_notifier_pollset); |
| 277 | return (grpc_pollset *)notifier; |
| 278 | } |
| 279 | |
| 280 | static bool fd_is_shutdown(grpc_fd *fd) { |
| 281 | return grpc_lfev_is_shutdown(&fd->read_closure); |
| 282 | } |
| 283 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 284 | static void fd_notify_on_read(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 285 | grpc_closure *closure) { |
| 286 | grpc_lfev_notify_on(exec_ctx, &fd->read_closure, closure); |
| 287 | } |
| 288 | |
| 289 | static void fd_notify_on_write(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 290 | grpc_closure *closure) { |
| 291 | grpc_lfev_notify_on(exec_ctx, &fd->write_closure, closure); |
| 292 | } |
| 293 | |
| 294 | static grpc_workqueue *fd_get_workqueue(grpc_fd *fd) { |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 295 | return (grpc_workqueue *)0xb0b51ed; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 296 | } |
| 297 | |
| 298 | static void fd_become_readable(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 299 | grpc_pollset *notifier) { |
| 300 | grpc_lfev_set_ready(exec_ctx, &fd->read_closure); |
| 301 | |
| 302 | /* Note, it is possible that fd_become_readable might be called twice with |
| 303 | different 'notifier's when an fd becomes readable and it is in two epoll |
| 304 | sets (This can happen briefly during polling island merges). In such cases |
| 305 | it does not really matter which notifer is set as the read_notifier_pollset |
| 306 | (They would both point to the same polling island anyway) */ |
| 307 | /* Use release store to match with acquire load in fd_get_read_notifier */ |
| 308 | gpr_atm_rel_store(&fd->read_notifier_pollset, (gpr_atm)notifier); |
| 309 | } |
| 310 | |
| 311 | static void fd_become_writable(grpc_exec_ctx *exec_ctx, grpc_fd *fd) { |
| 312 | grpc_lfev_set_ready(exec_ctx, &fd->write_closure); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 313 | } |
| 314 | |
| 315 | /******************************************************************************* |
| 316 | * Pollset Definitions |
| 317 | */ |
| 318 | |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 319 | GPR_TLS_DECL(g_current_thread_pollset); |
| 320 | GPR_TLS_DECL(g_current_thread_worker); |
| 321 | static gpr_atm g_active_poller; |
| 322 | static pollset_neighbourhood *g_neighbourhoods; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 323 | static size_t g_num_neighbourhoods; |
Craig Tiller | 67e229e | 2017-05-01 20:57:59 +0000 | [diff] [blame] | 324 | static gpr_mu g_wq_mu; |
| 325 | static grpc_closure_list g_wq_items; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 326 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 327 | /* Return true if first in list */ |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 328 | static bool worker_insert(grpc_pollset *pollset, grpc_pollset_worker *worker) { |
| 329 | if (pollset->root_worker == NULL) { |
| 330 | pollset->root_worker = worker; |
| 331 | worker->next = worker->prev = worker; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 332 | return true; |
| 333 | } else { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 334 | worker->next = pollset->root_worker; |
| 335 | worker->prev = worker->next->prev; |
| 336 | worker->next->prev = worker; |
| 337 | worker->prev->next = worker; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 338 | return false; |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | /* Return true if last in list */ |
| 343 | typedef enum { EMPTIED, NEW_ROOT, REMOVED } worker_remove_result; |
| 344 | |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 345 | static worker_remove_result worker_remove(grpc_pollset *pollset, |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 346 | grpc_pollset_worker *worker) { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 347 | if (worker == pollset->root_worker) { |
| 348 | if (worker == worker->next) { |
| 349 | pollset->root_worker = NULL; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 350 | return EMPTIED; |
| 351 | } else { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 352 | pollset->root_worker = worker->next; |
| 353 | worker->prev->next = worker->next; |
| 354 | worker->next->prev = worker->prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 355 | return NEW_ROOT; |
| 356 | } |
| 357 | } else { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 358 | worker->prev->next = worker->next; |
| 359 | worker->next->prev = worker->prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 360 | return REMOVED; |
| 361 | } |
| 362 | } |
| 363 | |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 364 | static size_t choose_neighbourhood(void) { |
| 365 | return (size_t)gpr_cpu_current_cpu() % g_num_neighbourhoods; |
| 366 | } |
| 367 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 368 | static grpc_error *pollset_global_init(void) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 369 | gpr_tls_init(&g_current_thread_pollset); |
| 370 | gpr_tls_init(&g_current_thread_worker); |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 371 | gpr_atm_no_barrier_store(&g_active_poller, 0); |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 372 | global_wakeup_fd.read_fd = -1; |
| 373 | grpc_error *err = grpc_wakeup_fd_init(&global_wakeup_fd); |
Craig Tiller | 67e229e | 2017-05-01 20:57:59 +0000 | [diff] [blame] | 374 | gpr_mu_init(&g_wq_mu); |
| 375 | g_wq_items = (grpc_closure_list)GRPC_CLOSURE_LIST_INIT; |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 376 | if (err != GRPC_ERROR_NONE) return err; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 377 | struct epoll_event ev = {.events = (uint32_t)(EPOLLIN | EPOLLET), |
| 378 | .data.ptr = &global_wakeup_fd}; |
| 379 | if (epoll_ctl(g_epfd, EPOLL_CTL_ADD, global_wakeup_fd.read_fd, &ev) != 0) { |
| 380 | return GRPC_OS_ERROR(errno, "epoll_ctl"); |
| 381 | } |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 382 | g_num_neighbourhoods = GPR_CLAMP(gpr_cpu_num_cores(), 1, MAX_NEIGHBOURHOODS); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 383 | g_neighbourhoods = |
| 384 | gpr_zalloc(sizeof(*g_neighbourhoods) * g_num_neighbourhoods); |
| 385 | for (size_t i = 0; i < g_num_neighbourhoods; i++) { |
| 386 | gpr_mu_init(&g_neighbourhoods[i].mu); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 387 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 388 | return GRPC_ERROR_NONE; |
| 389 | } |
| 390 | |
| 391 | static void pollset_global_shutdown(void) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 392 | gpr_tls_destroy(&g_current_thread_pollset); |
| 393 | gpr_tls_destroy(&g_current_thread_worker); |
Craig Tiller | 67e229e | 2017-05-01 20:57:59 +0000 | [diff] [blame] | 394 | gpr_mu_destroy(&g_wq_mu); |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 395 | 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] | 396 | for (size_t i = 0; i < g_num_neighbourhoods; i++) { |
| 397 | gpr_mu_destroy(&g_neighbourhoods[i].mu); |
| 398 | } |
| 399 | gpr_free(g_neighbourhoods); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 400 | } |
| 401 | |
| 402 | static void pollset_init(grpc_pollset *pollset, gpr_mu **mu) { |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 403 | gpr_mu_init(&pollset->mu); |
| 404 | *mu = &pollset->mu; |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 405 | pollset->neighbourhood = &g_neighbourhoods[choose_neighbourhood()]; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 406 | pollset->seen_inactive = true; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 407 | } |
| 408 | |
Craig Tiller | c610985 | 2017-05-01 14:26:49 -0700 | [diff] [blame] | 409 | static void pollset_destroy(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset) { |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 410 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 411 | if (!pollset->seen_inactive) { |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 412 | pollset_neighbourhood *neighbourhood = pollset->neighbourhood; |
| 413 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | a95bacf | 2017-05-01 12:51:24 -0700 | [diff] [blame] | 414 | retry_lock_neighbourhood: |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 415 | gpr_mu_lock(&neighbourhood->mu); |
| 416 | gpr_mu_lock(&pollset->mu); |
| 417 | if (!pollset->seen_inactive) { |
| 418 | if (pollset->neighbourhood != neighbourhood) { |
| 419 | gpr_mu_unlock(&neighbourhood->mu); |
| 420 | neighbourhood = pollset->neighbourhood; |
| 421 | gpr_mu_unlock(&pollset->mu); |
| 422 | goto retry_lock_neighbourhood; |
| 423 | } |
| 424 | pollset->prev->next = pollset->next; |
| 425 | pollset->next->prev = pollset->prev; |
| 426 | if (pollset == pollset->neighbourhood->active_root) { |
| 427 | pollset->neighbourhood->active_root = |
| 428 | pollset->next == pollset ? NULL : pollset->next; |
| 429 | } |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 430 | } |
| 431 | gpr_mu_unlock(&pollset->neighbourhood->mu); |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 432 | } |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 433 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 434 | gpr_mu_destroy(&pollset->mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | static grpc_error *pollset_kick_all(grpc_pollset *pollset) { |
| 438 | grpc_error *error = GRPC_ERROR_NONE; |
| 439 | if (pollset->root_worker != NULL) { |
| 440 | grpc_pollset_worker *worker = pollset->root_worker; |
| 441 | do { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 442 | switch (worker->kick_state) { |
| 443 | case KICKED: |
| 444 | break; |
| 445 | case UNKICKED: |
| 446 | SET_KICK_STATE(worker, KICKED); |
| 447 | if (worker->initialized_cv) { |
| 448 | gpr_cv_signal(&worker->cv); |
| 449 | } |
| 450 | break; |
| 451 | case DESIGNATED_POLLER: |
| 452 | SET_KICK_STATE(worker, KICKED); |
| 453 | append_error(&error, grpc_wakeup_fd_wakeup(&global_wakeup_fd), |
| 454 | "pollset_shutdown"); |
| 455 | break; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 456 | } |
| 457 | |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 458 | worker = worker->next; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 459 | } while (worker != pollset->root_worker); |
| 460 | } |
| 461 | return error; |
| 462 | } |
| 463 | |
| 464 | static void pollset_maybe_finish_shutdown(grpc_exec_ctx *exec_ctx, |
| 465 | grpc_pollset *pollset) { |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 466 | if (pollset->shutdown_closure != NULL && pollset->root_worker == NULL && |
| 467 | pollset->begin_refs == 0) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 468 | grpc_closure_sched(exec_ctx, pollset->shutdown_closure, GRPC_ERROR_NONE); |
| 469 | pollset->shutdown_closure = NULL; |
| 470 | } |
| 471 | } |
| 472 | |
| 473 | static void pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 474 | grpc_closure *closure) { |
| 475 | GPR_ASSERT(pollset->shutdown_closure == NULL); |
| 476 | pollset->shutdown_closure = closure; |
| 477 | GRPC_LOG_IF_ERROR("pollset_shutdown", pollset_kick_all(pollset)); |
| 478 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
| 479 | } |
| 480 | |
Craig Tiller | a95bacf | 2017-05-01 12:51:24 -0700 | [diff] [blame] | 481 | #define MAX_EPOLL_EVENTS 100 |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 482 | |
| 483 | static int poll_deadline_to_millis_timeout(gpr_timespec deadline, |
| 484 | gpr_timespec now) { |
| 485 | gpr_timespec timeout; |
| 486 | if (gpr_time_cmp(deadline, gpr_inf_future(deadline.clock_type)) == 0) { |
| 487 | return -1; |
| 488 | } |
| 489 | |
| 490 | if (gpr_time_cmp(deadline, now) <= 0) { |
| 491 | return 0; |
| 492 | } |
| 493 | |
| 494 | static const gpr_timespec round_up = { |
| 495 | .clock_type = GPR_TIMESPAN, .tv_sec = 0, .tv_nsec = GPR_NS_PER_MS - 1}; |
| 496 | timeout = gpr_time_sub(deadline, now); |
| 497 | int millis = gpr_time_to_millis(gpr_time_add(timeout, round_up)); |
| 498 | return millis >= 1 ? millis : 1; |
| 499 | } |
| 500 | |
| 501 | static grpc_error *pollset_epoll(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 502 | gpr_timespec now, gpr_timespec deadline) { |
| 503 | struct epoll_event events[MAX_EPOLL_EVENTS]; |
| 504 | static const char *err_desc = "pollset_poll"; |
| 505 | |
| 506 | int timeout = poll_deadline_to_millis_timeout(deadline, now); |
| 507 | |
| 508 | if (timeout != 0) { |
| 509 | GRPC_SCHEDULING_START_BLOCKING_REGION; |
| 510 | } |
| 511 | int r; |
| 512 | do { |
| 513 | r = epoll_wait(g_epfd, events, MAX_EPOLL_EVENTS, timeout); |
| 514 | } while (r < 0 && errno == EINTR); |
| 515 | if (timeout != 0) { |
| 516 | GRPC_SCHEDULING_END_BLOCKING_REGION; |
| 517 | } |
| 518 | |
| 519 | if (r < 0) return GRPC_OS_ERROR(errno, "epoll_wait"); |
| 520 | |
| 521 | grpc_error *error = GRPC_ERROR_NONE; |
| 522 | for (int i = 0; i < r; i++) { |
| 523 | void *data_ptr = events[i].data.ptr; |
| 524 | if (data_ptr == &global_wakeup_fd) { |
Craig Tiller | 67e229e | 2017-05-01 20:57:59 +0000 | [diff] [blame] | 525 | gpr_mu_lock(&g_wq_mu); |
| 526 | grpc_closure_list_move(&g_wq_items, &exec_ctx->closure_list); |
| 527 | gpr_mu_unlock(&g_wq_mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 528 | append_error(&error, grpc_wakeup_fd_consume_wakeup(&global_wakeup_fd), |
| 529 | err_desc); |
| 530 | } else { |
| 531 | grpc_fd *fd = (grpc_fd *)(data_ptr); |
| 532 | bool cancel = (events[i].events & (EPOLLERR | EPOLLHUP)) != 0; |
| 533 | bool read_ev = (events[i].events & (EPOLLIN | EPOLLPRI)) != 0; |
| 534 | bool write_ev = (events[i].events & EPOLLOUT) != 0; |
| 535 | if (read_ev || cancel) { |
| 536 | fd_become_readable(exec_ctx, fd, pollset); |
| 537 | } |
| 538 | if (write_ev || cancel) { |
| 539 | fd_become_writable(exec_ctx, fd); |
| 540 | } |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | return error; |
| 545 | } |
| 546 | |
| 547 | static bool begin_worker(grpc_pollset *pollset, grpc_pollset_worker *worker, |
| 548 | grpc_pollset_worker **worker_hdl, gpr_timespec *now, |
| 549 | gpr_timespec deadline) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 550 | if (worker_hdl != NULL) *worker_hdl = worker; |
| 551 | worker->initialized_cv = false; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 552 | SET_KICK_STATE(worker, UNKICKED); |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 553 | worker->schedule_on_end_work = (grpc_closure_list)GRPC_CLOSURE_LIST_INIT; |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 554 | pollset->begin_refs++; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 555 | |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 556 | if (pollset->seen_inactive) { |
| 557 | // pollset has been observed to be inactive, we need to move back to the |
| 558 | // active list |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 559 | bool is_reassigning = false; |
| 560 | if (!pollset->reassigning_neighbourhood) { |
| 561 | is_reassigning = true; |
| 562 | pollset->reassigning_neighbourhood = true; |
| 563 | pollset->neighbourhood = &g_neighbourhoods[choose_neighbourhood()]; |
| 564 | } |
| 565 | pollset_neighbourhood *neighbourhood = pollset->neighbourhood; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 566 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 567 | // pollset unlocked: state may change (even worker->kick_state) |
| 568 | retry_lock_neighbourhood: |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 569 | gpr_mu_lock(&neighbourhood->mu); |
| 570 | gpr_mu_lock(&pollset->mu); |
| 571 | if (pollset->seen_inactive) { |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 572 | if (neighbourhood != pollset->neighbourhood) { |
| 573 | gpr_mu_unlock(&neighbourhood->mu); |
| 574 | neighbourhood = pollset->neighbourhood; |
| 575 | gpr_mu_unlock(&pollset->mu); |
| 576 | goto retry_lock_neighbourhood; |
| 577 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 578 | pollset->seen_inactive = false; |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 579 | if (neighbourhood->active_root == NULL) { |
| 580 | neighbourhood->active_root = pollset->next = pollset->prev = pollset; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 581 | if (worker->kick_state == UNKICKED && |
| 582 | gpr_atm_no_barrier_cas(&g_active_poller, 0, (gpr_atm)worker)) { |
| 583 | SET_KICK_STATE(worker, DESIGNATED_POLLER); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 584 | } |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 585 | } else { |
| 586 | pollset->next = neighbourhood->active_root; |
| 587 | pollset->prev = pollset->next->prev; |
| 588 | pollset->next->prev = pollset->prev->next = pollset; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 589 | } |
| 590 | } |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 591 | if (is_reassigning) { |
| 592 | GPR_ASSERT(pollset->reassigning_neighbourhood); |
| 593 | pollset->reassigning_neighbourhood = false; |
| 594 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 595 | gpr_mu_unlock(&neighbourhood->mu); |
| 596 | } |
| 597 | worker_insert(pollset, worker); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 598 | pollset->begin_refs--; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 599 | if (worker->kick_state == UNKICKED) { |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 600 | 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] | 601 | worker->initialized_cv = true; |
| 602 | gpr_cv_init(&worker->cv); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 603 | while (worker->kick_state == UNKICKED && |
| 604 | pollset->shutdown_closure == NULL) { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 605 | if (gpr_cv_wait(&worker->cv, &pollset->mu, deadline) && |
| 606 | worker->kick_state == UNKICKED) { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 607 | SET_KICK_STATE(worker, KICKED); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 608 | } |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 609 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 610 | *now = gpr_now(now->clock_type); |
| 611 | } |
| 612 | |
Craig Tiller | 43bf259 | 2017-04-28 23:21:01 +0000 | [diff] [blame] | 613 | return worker->kick_state == DESIGNATED_POLLER && |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 614 | pollset->shutdown_closure == NULL; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 615 | } |
| 616 | |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 617 | static bool check_neighbourhood_for_available_poller( |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 618 | pollset_neighbourhood *neighbourhood) { |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 619 | bool found_worker = false; |
| 620 | do { |
| 621 | grpc_pollset *inspect = neighbourhood->active_root; |
| 622 | if (inspect == NULL) { |
| 623 | break; |
| 624 | } |
| 625 | gpr_mu_lock(&inspect->mu); |
| 626 | GPR_ASSERT(!inspect->seen_inactive); |
| 627 | grpc_pollset_worker *inspect_worker = inspect->root_worker; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 628 | if (inspect_worker != NULL) { |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 629 | do { |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 630 | switch (inspect_worker->kick_state) { |
| 631 | case UNKICKED: |
| 632 | if (gpr_atm_no_barrier_cas(&g_active_poller, 0, |
| 633 | (gpr_atm)inspect_worker)) { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 634 | SET_KICK_STATE(inspect_worker, DESIGNATED_POLLER); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 635 | if (inspect_worker->initialized_cv) { |
| 636 | gpr_cv_signal(&inspect_worker->cv); |
| 637 | } |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 638 | } |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 639 | // even if we didn't win the cas, there's a worker, we can stop |
| 640 | found_worker = true; |
| 641 | break; |
| 642 | case KICKED: |
| 643 | break; |
| 644 | case DESIGNATED_POLLER: |
| 645 | found_worker = true; // ok, so someone else found the worker, but |
| 646 | // we'll accept that |
| 647 | break; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 648 | } |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 649 | inspect_worker = inspect_worker->next; |
| 650 | } while (inspect_worker != inspect->root_worker); |
| 651 | } |
| 652 | if (!found_worker) { |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 653 | inspect->seen_inactive = true; |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 654 | if (inspect == neighbourhood->active_root) { |
Craig Tiller | a95bacf | 2017-05-01 12:51:24 -0700 | [diff] [blame] | 655 | neighbourhood->active_root = |
| 656 | inspect->next == inspect ? NULL : inspect->next; |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 657 | } |
| 658 | inspect->next->prev = inspect->prev; |
| 659 | inspect->prev->next = inspect->next; |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 660 | inspect->next = inspect->prev = NULL; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 661 | } |
| 662 | gpr_mu_unlock(&inspect->mu); |
| 663 | } while (!found_worker); |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 664 | return found_worker; |
| 665 | } |
| 666 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 667 | static void end_worker(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 668 | grpc_pollset_worker *worker, |
| 669 | grpc_pollset_worker **worker_hdl) { |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 670 | if (worker_hdl != NULL) *worker_hdl = NULL; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 671 | SET_KICK_STATE(worker, KICKED); |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 672 | grpc_closure_list_move(&worker->schedule_on_end_work, |
| 673 | &exec_ctx->closure_list); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 674 | if (gpr_atm_no_barrier_load(&g_active_poller) == (gpr_atm)worker) { |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 675 | if (worker->next != worker && worker->next->kick_state == UNKICKED) { |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 676 | GPR_ASSERT(worker->next->initialized_cv); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 677 | gpr_atm_no_barrier_store(&g_active_poller, (gpr_atm)worker->next); |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 678 | SET_KICK_STATE(worker->next, DESIGNATED_POLLER); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 679 | gpr_cv_signal(&worker->next->cv); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 680 | if (grpc_exec_ctx_has_work(exec_ctx)) { |
| 681 | gpr_mu_unlock(&pollset->mu); |
| 682 | grpc_exec_ctx_flush(exec_ctx); |
| 683 | gpr_mu_lock(&pollset->mu); |
| 684 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 685 | } else { |
| 686 | gpr_atm_no_barrier_store(&g_active_poller, 0); |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 687 | size_t poller_neighbourhood_idx = |
| 688 | (size_t)(pollset->neighbourhood - g_neighbourhoods); |
Craig Tiller | bb74267 | 2017-05-17 22:19:05 +0000 | [diff] [blame] | 689 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 690 | bool found_worker = false; |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 691 | bool scan_state[MAX_NEIGHBOURHOODS]; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 692 | for (size_t i = 0; !found_worker && i < g_num_neighbourhoods; i++) { |
| 693 | pollset_neighbourhood *neighbourhood = |
| 694 | &g_neighbourhoods[(poller_neighbourhood_idx + i) % |
| 695 | g_num_neighbourhoods]; |
| 696 | if (gpr_mu_trylock(&neighbourhood->mu)) { |
| 697 | found_worker = |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 698 | check_neighbourhood_for_available_poller(neighbourhood); |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 699 | gpr_mu_unlock(&neighbourhood->mu); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 700 | scan_state[i] = true; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 701 | } else { |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 702 | scan_state[i] = false; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 703 | } |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 704 | } |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 705 | for (size_t i = 0; !found_worker && i < g_num_neighbourhoods; i++) { |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 706 | if (scan_state[i]) continue; |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 707 | pollset_neighbourhood *neighbourhood = |
| 708 | &g_neighbourhoods[(poller_neighbourhood_idx + i) % |
| 709 | g_num_neighbourhoods]; |
| 710 | gpr_mu_lock(&neighbourhood->mu); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 711 | found_worker = check_neighbourhood_for_available_poller(neighbourhood); |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 712 | gpr_mu_unlock(&neighbourhood->mu); |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 713 | } |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 714 | grpc_exec_ctx_flush(exec_ctx); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 715 | gpr_mu_lock(&pollset->mu); |
| 716 | } |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 717 | } else if (grpc_exec_ctx_has_work(exec_ctx)) { |
| 718 | gpr_mu_unlock(&pollset->mu); |
| 719 | grpc_exec_ctx_flush(exec_ctx); |
| 720 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 721 | } |
| 722 | if (worker->initialized_cv) { |
| 723 | gpr_cv_destroy(&worker->cv); |
| 724 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 725 | if (EMPTIED == worker_remove(pollset, worker)) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 726 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
| 727 | } |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 728 | 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] | 729 | } |
| 730 | |
| 731 | /* pollset->po.mu lock must be held by the caller before calling this. |
| 732 | The function pollset_work() may temporarily release the lock (pollset->po.mu) |
| 733 | during the course of its execution but it will always re-acquire the lock and |
| 734 | ensure that it is held by the time the function returns */ |
| 735 | static grpc_error *pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 736 | grpc_pollset_worker **worker_hdl, |
| 737 | gpr_timespec now, gpr_timespec deadline) { |
| 738 | grpc_pollset_worker worker; |
| 739 | grpc_error *error = GRPC_ERROR_NONE; |
| 740 | static const char *err_desc = "pollset_work"; |
| 741 | if (pollset->kicked_without_poller) { |
| 742 | pollset->kicked_without_poller = false; |
| 743 | return GRPC_ERROR_NONE; |
| 744 | } |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 745 | gpr_tls_set(&g_current_thread_pollset, (intptr_t)pollset); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 746 | if (begin_worker(pollset, &worker, worker_hdl, &now, deadline)) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 747 | gpr_tls_set(&g_current_thread_worker, (intptr_t)&worker); |
| 748 | GPR_ASSERT(!pollset->shutdown_closure); |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 749 | GPR_ASSERT(!pollset->seen_inactive); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 750 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 751 | append_error(&error, pollset_epoll(exec_ctx, pollset, now, deadline), |
| 752 | err_desc); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 753 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 754 | gpr_tls_set(&g_current_thread_worker, 0); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 755 | } |
| 756 | end_worker(exec_ctx, pollset, &worker, worker_hdl); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 757 | gpr_tls_set(&g_current_thread_pollset, 0); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 758 | return error; |
| 759 | } |
| 760 | |
| 761 | static grpc_error *pollset_kick(grpc_pollset *pollset, |
| 762 | grpc_pollset_worker *specific_worker) { |
Craig Tiller | b89bac0 | 2017-05-26 15:20:32 +0000 | [diff] [blame] | 763 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 764 | gpr_strvec log; |
| 765 | gpr_strvec_init(&log); |
| 766 | char *tmp; |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame^] | 767 | gpr_asprintf( |
| 768 | &tmp, "PS:%p KICK:%p curps=%p curworker=%p root=%p", pollset, |
| 769 | specific_worker, (void *)gpr_tls_get(&g_current_thread_pollset), |
| 770 | (void *)gpr_tls_get(&g_current_thread_worker), pollset->root_worker); |
Craig Tiller | b89bac0 | 2017-05-26 15:20:32 +0000 | [diff] [blame] | 771 | gpr_strvec_add(&log, tmp); |
| 772 | if (pollset->root_worker != NULL) { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame^] | 773 | gpr_asprintf(&tmp, " {kicked=%d next=%p {kicked=%d}}", |
| 774 | pollset->root_worker->kick_state, pollset->root_worker->next, |
| 775 | pollset->root_worker->next->kick_state); |
Craig Tiller | b89bac0 | 2017-05-26 15:20:32 +0000 | [diff] [blame] | 776 | gpr_strvec_add(&log, tmp); |
| 777 | } |
| 778 | if (specific_worker != NULL) { |
| 779 | gpr_asprintf(&tmp, " worker_kicked=%d", specific_worker->kick_state); |
| 780 | gpr_strvec_add(&log, tmp); |
| 781 | } |
| 782 | tmp = gpr_strvec_flatten(&log, NULL); |
| 783 | gpr_strvec_destroy(&log); |
| 784 | gpr_log(GPR_DEBUG, "%s", tmp); |
| 785 | gpr_free(tmp); |
| 786 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 787 | if (specific_worker == NULL) { |
| 788 | if (gpr_tls_get(&g_current_thread_pollset) != (intptr_t)pollset) { |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 789 | grpc_pollset_worker *root_worker = pollset->root_worker; |
| 790 | if (root_worker == NULL) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 791 | pollset->kicked_without_poller = true; |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame^] | 792 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 793 | gpr_log(GPR_DEBUG, " .. kicked_without_poller"); |
| 794 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 795 | return GRPC_ERROR_NONE; |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 796 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 797 | grpc_pollset_worker *next_worker = root_worker->next; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 798 | if (root_worker == next_worker && // only try and wake up a poller if |
| 799 | // there is no next worker |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 800 | root_worker == (grpc_pollset_worker *)gpr_atm_no_barrier_load( |
| 801 | &g_active_poller)) { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame^] | 802 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 803 | gpr_log(GPR_DEBUG, " .. kicked %p", root_worker); |
| 804 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 805 | SET_KICK_STATE(root_worker, KICKED); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 806 | return grpc_wakeup_fd_wakeup(&global_wakeup_fd); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 807 | } else if (next_worker->kick_state == UNKICKED) { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame^] | 808 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 809 | gpr_log(GPR_DEBUG, " .. kicked %p", next_worker); |
| 810 | } |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 811 | GPR_ASSERT(next_worker->initialized_cv); |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 812 | SET_KICK_STATE(next_worker, KICKED); |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 813 | gpr_cv_signal(&next_worker->cv); |
| 814 | return GRPC_ERROR_NONE; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 815 | } else if (next_worker->kick_state == DESIGNATED_POLLER) { |
| 816 | if (root_worker->kick_state != DESIGNATED_POLLER) { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame^] | 817 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 818 | gpr_log(GPR_DEBUG, " .. kicked root non-poller %p", next_worker); |
| 819 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 820 | SET_KICK_STATE(root_worker, KICKED); |
| 821 | if (root_worker->initialized_cv) { |
| 822 | gpr_cv_signal(&root_worker->cv); |
| 823 | } |
| 824 | return GRPC_ERROR_NONE; |
| 825 | } else { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame^] | 826 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 827 | gpr_log(GPR_DEBUG, " .. non-root poller %p (root=%p)", next_worker, |
| 828 | root_worker); |
| 829 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 830 | SET_KICK_STATE(next_worker, KICKED); |
| 831 | return grpc_wakeup_fd_wakeup(&global_wakeup_fd); |
| 832 | } |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 833 | } else { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 834 | GPR_ASSERT(next_worker->kick_state == KICKED); |
| 835 | SET_KICK_STATE(next_worker, KICKED); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 836 | return GRPC_ERROR_NONE; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 837 | } |
| 838 | } else { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 839 | GPR_ASSERT(false); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 840 | return GRPC_ERROR_NONE; |
| 841 | } |
Craig Tiller | 43bf259 | 2017-04-28 23:21:01 +0000 | [diff] [blame] | 842 | } else if (specific_worker->kick_state == KICKED) { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame^] | 843 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 844 | gpr_log(GPR_DEBUG, " .. specific worker already kicked"); |
| 845 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 846 | return GRPC_ERROR_NONE; |
| 847 | } else if (gpr_tls_get(&g_current_thread_worker) == |
| 848 | (intptr_t)specific_worker) { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame^] | 849 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 850 | gpr_log(GPR_DEBUG, " .. mark %p kicked", specific_worker); |
| 851 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 852 | SET_KICK_STATE(specific_worker, KICKED); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 853 | return GRPC_ERROR_NONE; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 854 | } else if (specific_worker == |
| 855 | (grpc_pollset_worker *)gpr_atm_no_barrier_load(&g_active_poller)) { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame^] | 856 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 857 | gpr_log(GPR_DEBUG, " .. kick active poller"); |
| 858 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 859 | SET_KICK_STATE(specific_worker, KICKED); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 860 | return grpc_wakeup_fd_wakeup(&global_wakeup_fd); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 861 | } else if (specific_worker->initialized_cv) { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame^] | 862 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 863 | gpr_log(GPR_DEBUG, " .. kick waiting worker"); |
| 864 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 865 | SET_KICK_STATE(specific_worker, KICKED); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 866 | gpr_cv_signal(&specific_worker->cv); |
| 867 | return GRPC_ERROR_NONE; |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 868 | } else { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame^] | 869 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 870 | gpr_log(GPR_DEBUG, " .. kick non-waiting worker"); |
| 871 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 872 | SET_KICK_STATE(specific_worker, KICKED); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 873 | return GRPC_ERROR_NONE; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 874 | } |
| 875 | } |
| 876 | |
| 877 | static void pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 878 | grpc_fd *fd) {} |
| 879 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 880 | /******************************************************************************* |
| 881 | * Workqueue Definitions |
| 882 | */ |
| 883 | |
| 884 | #ifdef GRPC_WORKQUEUE_REFCOUNT_DEBUG |
| 885 | static grpc_workqueue *workqueue_ref(grpc_workqueue *workqueue, |
| 886 | const char *file, int line, |
| 887 | const char *reason) { |
| 888 | return workqueue; |
| 889 | } |
| 890 | |
| 891 | static void workqueue_unref(grpc_exec_ctx *exec_ctx, grpc_workqueue *workqueue, |
| 892 | const char *file, int line, const char *reason) {} |
| 893 | #else |
| 894 | static grpc_workqueue *workqueue_ref(grpc_workqueue *workqueue) { |
| 895 | return workqueue; |
| 896 | } |
| 897 | |
| 898 | static void workqueue_unref(grpc_exec_ctx *exec_ctx, |
| 899 | grpc_workqueue *workqueue) {} |
| 900 | #endif |
| 901 | |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 902 | static void wq_sched(grpc_exec_ctx *exec_ctx, grpc_closure *closure, |
| 903 | grpc_error *error) { |
| 904 | // find a neighbourhood to wakeup |
| 905 | bool scheduled = false; |
| 906 | size_t initial_neighbourhood = choose_neighbourhood(); |
| 907 | for (size_t i = 0; !scheduled && i < g_num_neighbourhoods; i++) { |
| 908 | pollset_neighbourhood *neighbourhood = |
| 909 | &g_neighbourhoods[(initial_neighbourhood + i) % g_num_neighbourhoods]; |
| 910 | if (gpr_mu_trylock(&neighbourhood->mu)) { |
| 911 | if (neighbourhood->active_root != NULL) { |
| 912 | grpc_pollset *inspect = neighbourhood->active_root; |
| 913 | do { |
| 914 | if (gpr_mu_trylock(&inspect->mu)) { |
| 915 | if (inspect->root_worker != NULL) { |
| 916 | grpc_pollset_worker *inspect_worker = inspect->root_worker; |
| 917 | do { |
| 918 | if (inspect_worker->kick_state == UNKICKED) { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 919 | SET_KICK_STATE(inspect_worker, KICKED); |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 920 | grpc_closure_list_append( |
| 921 | &inspect_worker->schedule_on_end_work, closure, error); |
| 922 | if (inspect_worker->initialized_cv) { |
| 923 | gpr_cv_signal(&inspect_worker->cv); |
| 924 | } |
| 925 | scheduled = true; |
| 926 | } |
| 927 | inspect_worker = inspect_worker->next; |
| 928 | } while (!scheduled && inspect_worker != inspect->root_worker); |
| 929 | } |
| 930 | gpr_mu_unlock(&inspect->mu); |
| 931 | } |
| 932 | inspect = inspect->next; |
| 933 | } while (!scheduled && inspect != neighbourhood->active_root); |
| 934 | } |
| 935 | gpr_mu_unlock(&neighbourhood->mu); |
| 936 | } |
| 937 | } |
| 938 | if (!scheduled) { |
Craig Tiller | 67e229e | 2017-05-01 20:57:59 +0000 | [diff] [blame] | 939 | gpr_mu_lock(&g_wq_mu); |
| 940 | grpc_closure_list_append(&g_wq_items, closure, error); |
| 941 | gpr_mu_unlock(&g_wq_mu); |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 942 | GRPC_LOG_IF_ERROR("workqueue_scheduler", |
| 943 | grpc_wakeup_fd_wakeup(&global_wakeup_fd)); |
| 944 | } |
| 945 | } |
| 946 | |
| 947 | static const grpc_closure_scheduler_vtable |
| 948 | singleton_workqueue_scheduler_vtable = {wq_sched, wq_sched, |
| 949 | "epoll1_workqueue"}; |
| 950 | |
| 951 | static grpc_closure_scheduler singleton_workqueue_scheduler = { |
| 952 | &singleton_workqueue_scheduler_vtable}; |
| 953 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 954 | static grpc_closure_scheduler *workqueue_scheduler(grpc_workqueue *workqueue) { |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 955 | return &singleton_workqueue_scheduler; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 956 | } |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 957 | |
| 958 | /******************************************************************************* |
| 959 | * Pollset-set Definitions |
| 960 | */ |
| 961 | |
| 962 | static grpc_pollset_set *pollset_set_create(void) { |
| 963 | return (grpc_pollset_set *)((intptr_t)0xdeafbeef); |
| 964 | } |
| 965 | |
| 966 | static void pollset_set_destroy(grpc_exec_ctx *exec_ctx, |
| 967 | grpc_pollset_set *pss) {} |
| 968 | |
| 969 | static void pollset_set_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset_set *pss, |
| 970 | grpc_fd *fd) {} |
| 971 | |
| 972 | static void pollset_set_del_fd(grpc_exec_ctx *exec_ctx, grpc_pollset_set *pss, |
| 973 | grpc_fd *fd) {} |
| 974 | |
| 975 | static void pollset_set_add_pollset(grpc_exec_ctx *exec_ctx, |
| 976 | grpc_pollset_set *pss, grpc_pollset *ps) {} |
| 977 | |
| 978 | static void pollset_set_del_pollset(grpc_exec_ctx *exec_ctx, |
| 979 | grpc_pollset_set *pss, grpc_pollset *ps) {} |
| 980 | |
| 981 | static void pollset_set_add_pollset_set(grpc_exec_ctx *exec_ctx, |
| 982 | grpc_pollset_set *bag, |
| 983 | grpc_pollset_set *item) {} |
| 984 | |
| 985 | static void pollset_set_del_pollset_set(grpc_exec_ctx *exec_ctx, |
| 986 | grpc_pollset_set *bag, |
| 987 | grpc_pollset_set *item) {} |
| 988 | |
| 989 | /******************************************************************************* |
| 990 | * Event engine binding |
| 991 | */ |
| 992 | |
| 993 | static void shutdown_engine(void) { |
| 994 | fd_global_shutdown(); |
| 995 | pollset_global_shutdown(); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 996 | } |
| 997 | |
| 998 | static const grpc_event_engine_vtable vtable = { |
| 999 | .pollset_size = sizeof(grpc_pollset), |
| 1000 | |
| 1001 | .fd_create = fd_create, |
| 1002 | .fd_wrapped_fd = fd_wrapped_fd, |
| 1003 | .fd_orphan = fd_orphan, |
| 1004 | .fd_shutdown = fd_shutdown, |
| 1005 | .fd_is_shutdown = fd_is_shutdown, |
| 1006 | .fd_notify_on_read = fd_notify_on_read, |
| 1007 | .fd_notify_on_write = fd_notify_on_write, |
| 1008 | .fd_get_read_notifier_pollset = fd_get_read_notifier_pollset, |
| 1009 | .fd_get_workqueue = fd_get_workqueue, |
| 1010 | |
| 1011 | .pollset_init = pollset_init, |
| 1012 | .pollset_shutdown = pollset_shutdown, |
| 1013 | .pollset_destroy = pollset_destroy, |
| 1014 | .pollset_work = pollset_work, |
| 1015 | .pollset_kick = pollset_kick, |
| 1016 | .pollset_add_fd = pollset_add_fd, |
| 1017 | |
| 1018 | .pollset_set_create = pollset_set_create, |
| 1019 | .pollset_set_destroy = pollset_set_destroy, |
| 1020 | .pollset_set_add_pollset = pollset_set_add_pollset, |
| 1021 | .pollset_set_del_pollset = pollset_set_del_pollset, |
| 1022 | .pollset_set_add_pollset_set = pollset_set_add_pollset_set, |
| 1023 | .pollset_set_del_pollset_set = pollset_set_del_pollset_set, |
| 1024 | .pollset_set_add_fd = pollset_set_add_fd, |
| 1025 | .pollset_set_del_fd = pollset_set_del_fd, |
| 1026 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1027 | .workqueue_ref = workqueue_ref, |
| 1028 | .workqueue_unref = workqueue_unref, |
| 1029 | .workqueue_scheduler = workqueue_scheduler, |
| 1030 | |
| 1031 | .shutdown_engine = shutdown_engine, |
| 1032 | }; |
| 1033 | |
| 1034 | /* It is possible that GLIBC has epoll but the underlying kernel doesn't. |
| 1035 | * Create a dummy epoll_fd to make sure epoll support is available */ |
Craig Tiller | 6f0af49 | 2017-04-27 19:26:16 +0000 | [diff] [blame] | 1036 | const grpc_event_engine_vtable *grpc_init_epoll1_linux(bool explicit_request) { |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1037 | if (!grpc_has_wakeup_fd()) { |
| 1038 | return NULL; |
| 1039 | } |
| 1040 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1041 | g_epfd = epoll_create1(EPOLL_CLOEXEC); |
| 1042 | if (g_epfd < 0) { |
| 1043 | gpr_log(GPR_ERROR, "epoll unavailable"); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1044 | return NULL; |
| 1045 | } |
| 1046 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1047 | fd_global_init(); |
| 1048 | |
| 1049 | if (!GRPC_LOG_IF_ERROR("pollset_global_init", pollset_global_init())) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1050 | close(g_epfd); |
| 1051 | fd_global_shutdown(); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1052 | return NULL; |
| 1053 | } |
| 1054 | |
| 1055 | return &vtable; |
| 1056 | } |
| 1057 | |
| 1058 | #else /* defined(GRPC_LINUX_EPOLL) */ |
| 1059 | #if defined(GRPC_POSIX_SOCKET) |
| 1060 | #include "src/core/lib/iomgr/ev_posix.h" |
| 1061 | /* If GRPC_LINUX_EPOLL is not defined, it means epoll is not available. Return |
| 1062 | * NULL */ |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 1063 | const grpc_event_engine_vtable *grpc_init_epoll1_linux(bool explicit_request) { |
| 1064 | return NULL; |
| 1065 | } |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1066 | #endif /* defined(GRPC_POSIX_SOCKET) */ |
| 1067 | #endif /* !defined(GRPC_LINUX_EPOLL) */ |