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 | |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 97 | static const char *kick_state_string(kick_state st) { |
| 98 | switch (st) { |
| 99 | case UNKICKED: |
| 100 | return "UNKICKED"; |
| 101 | case KICKED: |
| 102 | return "KICKED"; |
| 103 | case DESIGNATED_POLLER: |
| 104 | return "DESIGNATED_POLLER"; |
| 105 | } |
| 106 | GPR_UNREACHABLE_CODE(return "UNKNOWN"); |
| 107 | } |
| 108 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 109 | struct grpc_pollset_worker { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 110 | kick_state kick_state; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 111 | int kick_state_mutator; // which line of code last changed kick state |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 112 | bool initialized_cv; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 113 | grpc_pollset_worker *next; |
| 114 | grpc_pollset_worker *prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 115 | gpr_cv cv; |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 116 | grpc_closure_list schedule_on_end_work; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 117 | }; |
| 118 | |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 119 | #define SET_KICK_STATE(worker, state) \ |
| 120 | do { \ |
| 121 | (worker)->kick_state = (state); \ |
| 122 | (worker)->kick_state_mutator = __LINE__; \ |
| 123 | } while (false) |
| 124 | |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 125 | #define MAX_NEIGHBOURHOODS 1024 |
| 126 | |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 127 | typedef struct pollset_neighbourhood { |
| 128 | gpr_mu mu; |
| 129 | grpc_pollset *active_root; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 130 | char pad[GPR_CACHELINE_SIZE]; |
| 131 | } pollset_neighbourhood; |
| 132 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 133 | struct grpc_pollset { |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 134 | gpr_mu mu; |
| 135 | pollset_neighbourhood *neighbourhood; |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 136 | bool reassigning_neighbourhood; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 137 | grpc_pollset_worker *root_worker; |
| 138 | bool kicked_without_poller; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 139 | bool seen_inactive; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 140 | bool shutting_down; /* Is the pollset shutting down ? */ |
| 141 | bool finish_shutdown_called; /* Is the 'finish_shutdown_locked()' called ? */ |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 142 | grpc_closure *shutdown_closure; /* Called after after shutdown is complete */ |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 143 | int begin_refs; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 144 | |
| 145 | grpc_pollset *next; |
| 146 | grpc_pollset *prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 147 | }; |
| 148 | |
| 149 | /******************************************************************************* |
| 150 | * Pollset-set Declarations |
| 151 | */ |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 152 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 153 | struct grpc_pollset_set {}; |
| 154 | |
| 155 | /******************************************************************************* |
| 156 | * Common helpers |
| 157 | */ |
| 158 | |
| 159 | static bool append_error(grpc_error **composite, grpc_error *error, |
| 160 | const char *desc) { |
| 161 | if (error == GRPC_ERROR_NONE) return true; |
| 162 | if (*composite == GRPC_ERROR_NONE) { |
| 163 | *composite = GRPC_ERROR_CREATE_FROM_COPIED_STRING(desc); |
| 164 | } |
| 165 | *composite = grpc_error_add_child(*composite, error); |
| 166 | return false; |
| 167 | } |
| 168 | |
| 169 | /******************************************************************************* |
| 170 | * Fd Definitions |
| 171 | */ |
| 172 | |
| 173 | /* We need to keep a freelist not because of any concerns of malloc performance |
| 174 | * but instead so that implementations with multiple threads in (for example) |
| 175 | * epoll_wait deal with the race between pollset removal and incoming poll |
| 176 | * notifications. |
| 177 | * |
| 178 | * The problem is that the poller ultimately holds a reference to this |
| 179 | * object, so it is very difficult to know when is safe to free it, at least |
| 180 | * without some expensive synchronization. |
| 181 | * |
| 182 | * If we keep the object freelisted, in the worst case losing this race just |
| 183 | * becomes a spurious read notification on a reused fd. |
| 184 | */ |
| 185 | |
| 186 | /* The alarm system needs to be able to wakeup 'some poller' sometimes |
| 187 | * (specifically when a new alarm needs to be triggered earlier than the next |
| 188 | * alarm 'epoch'). This wakeup_fd gives us something to alert on when such a |
| 189 | * case occurs. */ |
| 190 | |
| 191 | static grpc_fd *fd_freelist = NULL; |
| 192 | static gpr_mu fd_freelist_mu; |
| 193 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 194 | static void fd_global_init(void) { gpr_mu_init(&fd_freelist_mu); } |
| 195 | |
| 196 | static void fd_global_shutdown(void) { |
| 197 | gpr_mu_lock(&fd_freelist_mu); |
| 198 | gpr_mu_unlock(&fd_freelist_mu); |
| 199 | while (fd_freelist != NULL) { |
| 200 | grpc_fd *fd = fd_freelist; |
| 201 | fd_freelist = fd_freelist->freelist_next; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 202 | gpr_free(fd); |
| 203 | } |
| 204 | gpr_mu_destroy(&fd_freelist_mu); |
| 205 | } |
| 206 | |
| 207 | static grpc_fd *fd_create(int fd, const char *name) { |
| 208 | grpc_fd *new_fd = NULL; |
| 209 | |
| 210 | gpr_mu_lock(&fd_freelist_mu); |
| 211 | if (fd_freelist != NULL) { |
| 212 | new_fd = fd_freelist; |
| 213 | fd_freelist = fd_freelist->freelist_next; |
| 214 | } |
| 215 | gpr_mu_unlock(&fd_freelist_mu); |
| 216 | |
| 217 | if (new_fd == NULL) { |
| 218 | new_fd = gpr_malloc(sizeof(grpc_fd)); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 219 | } |
| 220 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 221 | new_fd->fd = fd; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 222 | grpc_lfev_init(&new_fd->read_closure); |
| 223 | grpc_lfev_init(&new_fd->write_closure); |
| 224 | gpr_atm_no_barrier_store(&new_fd->read_notifier_pollset, (gpr_atm)NULL); |
| 225 | |
| 226 | new_fd->freelist_next = NULL; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 227 | |
| 228 | char *fd_name; |
| 229 | gpr_asprintf(&fd_name, "%s fd=%d", name, fd); |
| 230 | grpc_iomgr_register_object(&new_fd->iomgr_object, fd_name); |
| 231 | #ifdef GRPC_FD_REF_COUNT_DEBUG |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 232 | gpr_log(GPR_ERROR, "FD %d %p create %s", fd, (void *)new_fd, fd_name); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 233 | #endif |
| 234 | gpr_free(fd_name); |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 235 | |
| 236 | struct epoll_event ev = {.events = (uint32_t)(EPOLLIN | EPOLLOUT | EPOLLET), |
| 237 | .data.ptr = new_fd}; |
| 238 | if (epoll_ctl(g_epfd, EPOLL_CTL_ADD, fd, &ev) != 0) { |
| 239 | gpr_log(GPR_ERROR, "epoll_ctl failed: %s", strerror(errno)); |
| 240 | } |
| 241 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 242 | return new_fd; |
| 243 | } |
| 244 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 245 | static int fd_wrapped_fd(grpc_fd *fd) { return fd->fd; } |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 246 | |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 247 | /* Might be called multiple times */ |
| 248 | static void fd_shutdown(grpc_exec_ctx *exec_ctx, grpc_fd *fd, grpc_error *why) { |
| 249 | if (grpc_lfev_set_shutdown(exec_ctx, &fd->read_closure, |
| 250 | GRPC_ERROR_REF(why))) { |
| 251 | shutdown(fd->fd, SHUT_RDWR); |
| 252 | grpc_lfev_set_shutdown(exec_ctx, &fd->write_closure, GRPC_ERROR_REF(why)); |
| 253 | } |
| 254 | GRPC_ERROR_UNREF(why); |
| 255 | } |
| 256 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 257 | static void fd_orphan(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 258 | grpc_closure *on_done, int *release_fd, |
| 259 | const char *reason) { |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 260 | grpc_error *error = GRPC_ERROR_NONE; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 261 | |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 262 | if (!grpc_lfev_is_shutdown(&fd->read_closure)) { |
| 263 | fd_shutdown(exec_ctx, fd, GRPC_ERROR_CREATE_FROM_COPIED_STRING(reason)); |
| 264 | } |
| 265 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 266 | /* If release_fd is not NULL, we should be relinquishing control of the file |
| 267 | descriptor fd->fd (but we still own the grpc_fd structure). */ |
| 268 | if (release_fd != NULL) { |
| 269 | *release_fd = fd->fd; |
| 270 | } else { |
| 271 | close(fd->fd); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 272 | } |
| 273 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 274 | grpc_closure_sched(exec_ctx, on_done, GRPC_ERROR_REF(error)); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 275 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 276 | grpc_iomgr_unregister_object(&fd->iomgr_object); |
| 277 | grpc_lfev_destroy(&fd->read_closure); |
| 278 | grpc_lfev_destroy(&fd->write_closure); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 279 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 280 | gpr_mu_lock(&fd_freelist_mu); |
| 281 | fd->freelist_next = fd_freelist; |
| 282 | fd_freelist = fd; |
| 283 | gpr_mu_unlock(&fd_freelist_mu); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 284 | } |
| 285 | |
| 286 | static grpc_pollset *fd_get_read_notifier_pollset(grpc_exec_ctx *exec_ctx, |
| 287 | grpc_fd *fd) { |
| 288 | gpr_atm notifier = gpr_atm_acq_load(&fd->read_notifier_pollset); |
| 289 | return (grpc_pollset *)notifier; |
| 290 | } |
| 291 | |
| 292 | static bool fd_is_shutdown(grpc_fd *fd) { |
| 293 | return grpc_lfev_is_shutdown(&fd->read_closure); |
| 294 | } |
| 295 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 296 | static void fd_notify_on_read(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 297 | grpc_closure *closure) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 298 | grpc_lfev_notify_on(exec_ctx, &fd->read_closure, closure, "read"); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 299 | } |
| 300 | |
| 301 | static void fd_notify_on_write(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 302 | grpc_closure *closure) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 303 | grpc_lfev_notify_on(exec_ctx, &fd->write_closure, closure, "write"); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 304 | } |
| 305 | |
| 306 | static grpc_workqueue *fd_get_workqueue(grpc_fd *fd) { |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 307 | return (grpc_workqueue *)0xb0b51ed; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 308 | } |
| 309 | |
| 310 | static void fd_become_readable(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 311 | grpc_pollset *notifier) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 312 | grpc_lfev_set_ready(exec_ctx, &fd->read_closure, "read"); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 313 | |
| 314 | /* Note, it is possible that fd_become_readable might be called twice with |
| 315 | different 'notifier's when an fd becomes readable and it is in two epoll |
| 316 | sets (This can happen briefly during polling island merges). In such cases |
| 317 | it does not really matter which notifer is set as the read_notifier_pollset |
| 318 | (They would both point to the same polling island anyway) */ |
| 319 | /* Use release store to match with acquire load in fd_get_read_notifier */ |
| 320 | gpr_atm_rel_store(&fd->read_notifier_pollset, (gpr_atm)notifier); |
| 321 | } |
| 322 | |
| 323 | static void fd_become_writable(grpc_exec_ctx *exec_ctx, grpc_fd *fd) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 324 | grpc_lfev_set_ready(exec_ctx, &fd->write_closure, "write"); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 325 | } |
| 326 | |
| 327 | /******************************************************************************* |
| 328 | * Pollset Definitions |
| 329 | */ |
| 330 | |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 331 | GPR_TLS_DECL(g_current_thread_pollset); |
| 332 | GPR_TLS_DECL(g_current_thread_worker); |
| 333 | static gpr_atm g_active_poller; |
| 334 | static pollset_neighbourhood *g_neighbourhoods; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 335 | static size_t g_num_neighbourhoods; |
Craig Tiller | 67e229e | 2017-05-01 20:57:59 +0000 | [diff] [blame] | 336 | static gpr_mu g_wq_mu; |
| 337 | static grpc_closure_list g_wq_items; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 338 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 339 | /* Return true if first in list */ |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 340 | static bool worker_insert(grpc_pollset *pollset, grpc_pollset_worker *worker) { |
| 341 | if (pollset->root_worker == NULL) { |
| 342 | pollset->root_worker = worker; |
| 343 | worker->next = worker->prev = worker; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 344 | return true; |
| 345 | } else { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 346 | worker->next = pollset->root_worker; |
| 347 | worker->prev = worker->next->prev; |
| 348 | worker->next->prev = worker; |
| 349 | worker->prev->next = worker; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 350 | return false; |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | /* Return true if last in list */ |
| 355 | typedef enum { EMPTIED, NEW_ROOT, REMOVED } worker_remove_result; |
| 356 | |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 357 | static worker_remove_result worker_remove(grpc_pollset *pollset, |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 358 | grpc_pollset_worker *worker) { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 359 | if (worker == pollset->root_worker) { |
| 360 | if (worker == worker->next) { |
| 361 | pollset->root_worker = NULL; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 362 | return EMPTIED; |
| 363 | } else { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 364 | pollset->root_worker = worker->next; |
| 365 | worker->prev->next = worker->next; |
| 366 | worker->next->prev = worker->prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 367 | return NEW_ROOT; |
| 368 | } |
| 369 | } else { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 370 | worker->prev->next = worker->next; |
| 371 | worker->next->prev = worker->prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 372 | return REMOVED; |
| 373 | } |
| 374 | } |
| 375 | |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 376 | static size_t choose_neighbourhood(void) { |
| 377 | return (size_t)gpr_cpu_current_cpu() % g_num_neighbourhoods; |
| 378 | } |
| 379 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 380 | static grpc_error *pollset_global_init(void) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 381 | gpr_tls_init(&g_current_thread_pollset); |
| 382 | gpr_tls_init(&g_current_thread_worker); |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 383 | gpr_atm_no_barrier_store(&g_active_poller, 0); |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 384 | global_wakeup_fd.read_fd = -1; |
| 385 | grpc_error *err = grpc_wakeup_fd_init(&global_wakeup_fd); |
Craig Tiller | 67e229e | 2017-05-01 20:57:59 +0000 | [diff] [blame] | 386 | gpr_mu_init(&g_wq_mu); |
| 387 | g_wq_items = (grpc_closure_list)GRPC_CLOSURE_LIST_INIT; |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 388 | if (err != GRPC_ERROR_NONE) return err; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 389 | struct epoll_event ev = {.events = (uint32_t)(EPOLLIN | EPOLLET), |
| 390 | .data.ptr = &global_wakeup_fd}; |
| 391 | if (epoll_ctl(g_epfd, EPOLL_CTL_ADD, global_wakeup_fd.read_fd, &ev) != 0) { |
| 392 | return GRPC_OS_ERROR(errno, "epoll_ctl"); |
| 393 | } |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 394 | g_num_neighbourhoods = GPR_CLAMP(gpr_cpu_num_cores(), 1, MAX_NEIGHBOURHOODS); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 395 | g_neighbourhoods = |
| 396 | gpr_zalloc(sizeof(*g_neighbourhoods) * g_num_neighbourhoods); |
| 397 | for (size_t i = 0; i < g_num_neighbourhoods; i++) { |
| 398 | gpr_mu_init(&g_neighbourhoods[i].mu); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 399 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 400 | return GRPC_ERROR_NONE; |
| 401 | } |
| 402 | |
| 403 | static void pollset_global_shutdown(void) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 404 | gpr_tls_destroy(&g_current_thread_pollset); |
| 405 | gpr_tls_destroy(&g_current_thread_worker); |
Craig Tiller | 67e229e | 2017-05-01 20:57:59 +0000 | [diff] [blame] | 406 | gpr_mu_destroy(&g_wq_mu); |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 407 | 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] | 408 | for (size_t i = 0; i < g_num_neighbourhoods; i++) { |
| 409 | gpr_mu_destroy(&g_neighbourhoods[i].mu); |
| 410 | } |
| 411 | gpr_free(g_neighbourhoods); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 412 | } |
| 413 | |
| 414 | static void pollset_init(grpc_pollset *pollset, gpr_mu **mu) { |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 415 | gpr_mu_init(&pollset->mu); |
| 416 | *mu = &pollset->mu; |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 417 | pollset->neighbourhood = &g_neighbourhoods[choose_neighbourhood()]; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 418 | pollset->seen_inactive = true; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 419 | } |
| 420 | |
Craig Tiller | c610985 | 2017-05-01 14:26:49 -0700 | [diff] [blame] | 421 | static void pollset_destroy(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset) { |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 422 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 423 | if (!pollset->seen_inactive) { |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 424 | pollset_neighbourhood *neighbourhood = pollset->neighbourhood; |
| 425 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | a95bacf | 2017-05-01 12:51:24 -0700 | [diff] [blame] | 426 | retry_lock_neighbourhood: |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 427 | gpr_mu_lock(&neighbourhood->mu); |
| 428 | gpr_mu_lock(&pollset->mu); |
| 429 | if (!pollset->seen_inactive) { |
| 430 | if (pollset->neighbourhood != neighbourhood) { |
| 431 | gpr_mu_unlock(&neighbourhood->mu); |
| 432 | neighbourhood = pollset->neighbourhood; |
| 433 | gpr_mu_unlock(&pollset->mu); |
| 434 | goto retry_lock_neighbourhood; |
| 435 | } |
| 436 | pollset->prev->next = pollset->next; |
| 437 | pollset->next->prev = pollset->prev; |
| 438 | if (pollset == pollset->neighbourhood->active_root) { |
| 439 | pollset->neighbourhood->active_root = |
| 440 | pollset->next == pollset ? NULL : pollset->next; |
| 441 | } |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 442 | } |
| 443 | gpr_mu_unlock(&pollset->neighbourhood->mu); |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 444 | } |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 445 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 446 | gpr_mu_destroy(&pollset->mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 447 | } |
| 448 | |
| 449 | static grpc_error *pollset_kick_all(grpc_pollset *pollset) { |
| 450 | grpc_error *error = GRPC_ERROR_NONE; |
| 451 | if (pollset->root_worker != NULL) { |
| 452 | grpc_pollset_worker *worker = pollset->root_worker; |
| 453 | do { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 454 | switch (worker->kick_state) { |
| 455 | case KICKED: |
| 456 | break; |
| 457 | case UNKICKED: |
| 458 | SET_KICK_STATE(worker, KICKED); |
| 459 | if (worker->initialized_cv) { |
| 460 | gpr_cv_signal(&worker->cv); |
| 461 | } |
| 462 | break; |
| 463 | case DESIGNATED_POLLER: |
| 464 | SET_KICK_STATE(worker, KICKED); |
| 465 | append_error(&error, grpc_wakeup_fd_wakeup(&global_wakeup_fd), |
| 466 | "pollset_shutdown"); |
| 467 | break; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 468 | } |
| 469 | |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 470 | worker = worker->next; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 471 | } while (worker != pollset->root_worker); |
| 472 | } |
| 473 | return error; |
| 474 | } |
| 475 | |
| 476 | static void pollset_maybe_finish_shutdown(grpc_exec_ctx *exec_ctx, |
| 477 | grpc_pollset *pollset) { |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 478 | if (pollset->shutdown_closure != NULL && pollset->root_worker == NULL && |
| 479 | pollset->begin_refs == 0) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 480 | grpc_closure_sched(exec_ctx, pollset->shutdown_closure, GRPC_ERROR_NONE); |
| 481 | pollset->shutdown_closure = NULL; |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | static void pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 486 | grpc_closure *closure) { |
| 487 | GPR_ASSERT(pollset->shutdown_closure == NULL); |
Craig Tiller | c81512a | 2017-05-26 09:53:58 -0700 | [diff] [blame] | 488 | GPR_ASSERT(!pollset->shutting_down); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 489 | pollset->shutdown_closure = closure; |
Craig Tiller | c81512a | 2017-05-26 09:53:58 -0700 | [diff] [blame] | 490 | pollset->shutting_down = true; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 491 | GRPC_LOG_IF_ERROR("pollset_shutdown", pollset_kick_all(pollset)); |
| 492 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
| 493 | } |
| 494 | |
Craig Tiller | a95bacf | 2017-05-01 12:51:24 -0700 | [diff] [blame] | 495 | #define MAX_EPOLL_EVENTS 100 |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 496 | |
| 497 | static int poll_deadline_to_millis_timeout(gpr_timespec deadline, |
| 498 | gpr_timespec now) { |
| 499 | gpr_timespec timeout; |
| 500 | if (gpr_time_cmp(deadline, gpr_inf_future(deadline.clock_type)) == 0) { |
| 501 | return -1; |
| 502 | } |
| 503 | |
| 504 | if (gpr_time_cmp(deadline, now) <= 0) { |
| 505 | return 0; |
| 506 | } |
| 507 | |
| 508 | static const gpr_timespec round_up = { |
| 509 | .clock_type = GPR_TIMESPAN, .tv_sec = 0, .tv_nsec = GPR_NS_PER_MS - 1}; |
| 510 | timeout = gpr_time_sub(deadline, now); |
| 511 | int millis = gpr_time_to_millis(gpr_time_add(timeout, round_up)); |
| 512 | return millis >= 1 ? millis : 1; |
| 513 | } |
| 514 | |
| 515 | static grpc_error *pollset_epoll(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 516 | gpr_timespec now, gpr_timespec deadline) { |
| 517 | struct epoll_event events[MAX_EPOLL_EVENTS]; |
| 518 | static const char *err_desc = "pollset_poll"; |
| 519 | |
| 520 | int timeout = poll_deadline_to_millis_timeout(deadline, now); |
| 521 | |
| 522 | if (timeout != 0) { |
| 523 | GRPC_SCHEDULING_START_BLOCKING_REGION; |
| 524 | } |
| 525 | int r; |
| 526 | do { |
| 527 | r = epoll_wait(g_epfd, events, MAX_EPOLL_EVENTS, timeout); |
| 528 | } while (r < 0 && errno == EINTR); |
| 529 | if (timeout != 0) { |
| 530 | GRPC_SCHEDULING_END_BLOCKING_REGION; |
| 531 | } |
| 532 | |
| 533 | if (r < 0) return GRPC_OS_ERROR(errno, "epoll_wait"); |
| 534 | |
| 535 | grpc_error *error = GRPC_ERROR_NONE; |
| 536 | for (int i = 0; i < r; i++) { |
| 537 | void *data_ptr = events[i].data.ptr; |
| 538 | if (data_ptr == &global_wakeup_fd) { |
Craig Tiller | 67e229e | 2017-05-01 20:57:59 +0000 | [diff] [blame] | 539 | gpr_mu_lock(&g_wq_mu); |
| 540 | grpc_closure_list_move(&g_wq_items, &exec_ctx->closure_list); |
| 541 | gpr_mu_unlock(&g_wq_mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 542 | append_error(&error, grpc_wakeup_fd_consume_wakeup(&global_wakeup_fd), |
| 543 | err_desc); |
| 544 | } else { |
| 545 | grpc_fd *fd = (grpc_fd *)(data_ptr); |
| 546 | bool cancel = (events[i].events & (EPOLLERR | EPOLLHUP)) != 0; |
| 547 | bool read_ev = (events[i].events & (EPOLLIN | EPOLLPRI)) != 0; |
| 548 | bool write_ev = (events[i].events & EPOLLOUT) != 0; |
| 549 | if (read_ev || cancel) { |
| 550 | fd_become_readable(exec_ctx, fd, pollset); |
| 551 | } |
| 552 | if (write_ev || cancel) { |
| 553 | fd_become_writable(exec_ctx, fd); |
| 554 | } |
| 555 | } |
| 556 | } |
| 557 | |
| 558 | return error; |
| 559 | } |
| 560 | |
| 561 | static bool begin_worker(grpc_pollset *pollset, grpc_pollset_worker *worker, |
| 562 | grpc_pollset_worker **worker_hdl, gpr_timespec *now, |
| 563 | gpr_timespec deadline) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 564 | if (worker_hdl != NULL) *worker_hdl = worker; |
| 565 | worker->initialized_cv = false; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 566 | SET_KICK_STATE(worker, UNKICKED); |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 567 | worker->schedule_on_end_work = (grpc_closure_list)GRPC_CLOSURE_LIST_INIT; |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 568 | pollset->begin_refs++; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 569 | |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 570 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 571 | gpr_log(GPR_ERROR, "PS:%p BEGIN_STARTS:%p", pollset, worker); |
| 572 | } |
| 573 | |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 574 | if (pollset->seen_inactive) { |
| 575 | // pollset has been observed to be inactive, we need to move back to the |
| 576 | // active list |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 577 | bool is_reassigning = false; |
| 578 | if (!pollset->reassigning_neighbourhood) { |
| 579 | is_reassigning = true; |
| 580 | pollset->reassigning_neighbourhood = true; |
| 581 | pollset->neighbourhood = &g_neighbourhoods[choose_neighbourhood()]; |
| 582 | } |
| 583 | pollset_neighbourhood *neighbourhood = pollset->neighbourhood; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 584 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 585 | // pollset unlocked: state may change (even worker->kick_state) |
| 586 | retry_lock_neighbourhood: |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 587 | gpr_mu_lock(&neighbourhood->mu); |
| 588 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 589 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 590 | gpr_log(GPR_ERROR, "PS:%p BEGIN_REORG:%p kick_state=%s is_reassigning=%d", |
| 591 | pollset, worker, kick_state_string(worker->kick_state), |
| 592 | is_reassigning); |
| 593 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 594 | if (pollset->seen_inactive) { |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 595 | if (neighbourhood != pollset->neighbourhood) { |
| 596 | gpr_mu_unlock(&neighbourhood->mu); |
| 597 | neighbourhood = pollset->neighbourhood; |
| 598 | gpr_mu_unlock(&pollset->mu); |
| 599 | goto retry_lock_neighbourhood; |
| 600 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 601 | pollset->seen_inactive = false; |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 602 | if (neighbourhood->active_root == NULL) { |
| 603 | neighbourhood->active_root = pollset->next = pollset->prev = pollset; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 604 | if (worker->kick_state == UNKICKED && |
| 605 | gpr_atm_no_barrier_cas(&g_active_poller, 0, (gpr_atm)worker)) { |
| 606 | SET_KICK_STATE(worker, DESIGNATED_POLLER); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 607 | } |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 608 | } else { |
| 609 | pollset->next = neighbourhood->active_root; |
| 610 | pollset->prev = pollset->next->prev; |
| 611 | pollset->next->prev = pollset->prev->next = pollset; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 612 | } |
| 613 | } |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 614 | if (is_reassigning) { |
| 615 | GPR_ASSERT(pollset->reassigning_neighbourhood); |
| 616 | pollset->reassigning_neighbourhood = false; |
| 617 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 618 | gpr_mu_unlock(&neighbourhood->mu); |
| 619 | } |
| 620 | worker_insert(pollset, worker); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 621 | pollset->begin_refs--; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 622 | if (worker->kick_state == UNKICKED) { |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 623 | 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] | 624 | worker->initialized_cv = true; |
| 625 | gpr_cv_init(&worker->cv); |
Craig Tiller | c81512a | 2017-05-26 09:53:58 -0700 | [diff] [blame] | 626 | while (worker->kick_state == UNKICKED && !pollset->shutting_down) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 627 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 628 | gpr_log(GPR_ERROR, "PS:%p BEGIN_WAIT:%p kick_state=%s shutdown=%d", |
| 629 | pollset, worker, kick_state_string(worker->kick_state), |
| 630 | pollset->shutting_down); |
| 631 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 632 | if (gpr_cv_wait(&worker->cv, &pollset->mu, deadline) && |
| 633 | worker->kick_state == UNKICKED) { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 634 | SET_KICK_STATE(worker, KICKED); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 635 | } |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 636 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 637 | *now = gpr_now(now->clock_type); |
| 638 | } |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 639 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 640 | gpr_log(GPR_ERROR, "PS:%p BEGIN_DONE:%p kick_state=%s shutdown=%d", pollset, |
| 641 | worker, kick_state_string(worker->kick_state), |
| 642 | pollset->shutting_down); |
| 643 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 644 | |
Craig Tiller | c81512a | 2017-05-26 09:53:58 -0700 | [diff] [blame] | 645 | return worker->kick_state == DESIGNATED_POLLER && !pollset->shutting_down; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 646 | } |
| 647 | |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 648 | static bool check_neighbourhood_for_available_poller( |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 649 | pollset_neighbourhood *neighbourhood) { |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 650 | bool found_worker = false; |
| 651 | do { |
| 652 | grpc_pollset *inspect = neighbourhood->active_root; |
| 653 | if (inspect == NULL) { |
| 654 | break; |
| 655 | } |
| 656 | gpr_mu_lock(&inspect->mu); |
| 657 | GPR_ASSERT(!inspect->seen_inactive); |
| 658 | grpc_pollset_worker *inspect_worker = inspect->root_worker; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 659 | if (inspect_worker != NULL) { |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 660 | do { |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 661 | switch (inspect_worker->kick_state) { |
| 662 | case UNKICKED: |
| 663 | if (gpr_atm_no_barrier_cas(&g_active_poller, 0, |
| 664 | (gpr_atm)inspect_worker)) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 665 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 666 | gpr_log(GPR_DEBUG, " .. choose next poller to be %p", |
| 667 | inspect_worker); |
| 668 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 669 | SET_KICK_STATE(inspect_worker, DESIGNATED_POLLER); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 670 | if (inspect_worker->initialized_cv) { |
| 671 | gpr_cv_signal(&inspect_worker->cv); |
| 672 | } |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 673 | } else { |
| 674 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 675 | gpr_log(GPR_DEBUG, " .. beaten to choose next poller"); |
| 676 | } |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 677 | } |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 678 | // even if we didn't win the cas, there's a worker, we can stop |
| 679 | found_worker = true; |
| 680 | break; |
| 681 | case KICKED: |
| 682 | break; |
| 683 | case DESIGNATED_POLLER: |
| 684 | found_worker = true; // ok, so someone else found the worker, but |
| 685 | // we'll accept that |
| 686 | break; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 687 | } |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 688 | inspect_worker = inspect_worker->next; |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 689 | } while (!found_worker && inspect_worker != inspect->root_worker); |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 690 | } |
| 691 | if (!found_worker) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 692 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 693 | gpr_log(GPR_DEBUG, " .. mark pollset %p inactive", inspect); |
| 694 | } |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 695 | inspect->seen_inactive = true; |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 696 | if (inspect == neighbourhood->active_root) { |
Craig Tiller | a95bacf | 2017-05-01 12:51:24 -0700 | [diff] [blame] | 697 | neighbourhood->active_root = |
| 698 | inspect->next == inspect ? NULL : inspect->next; |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 699 | } |
| 700 | inspect->next->prev = inspect->prev; |
| 701 | inspect->prev->next = inspect->next; |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 702 | inspect->next = inspect->prev = NULL; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 703 | } |
| 704 | gpr_mu_unlock(&inspect->mu); |
| 705 | } while (!found_worker); |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 706 | return found_worker; |
| 707 | } |
| 708 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 709 | static void end_worker(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 710 | grpc_pollset_worker *worker, |
| 711 | grpc_pollset_worker **worker_hdl) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 712 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 713 | gpr_log(GPR_DEBUG, "PS:%p END_WORKER:%p", pollset, worker); |
| 714 | } |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 715 | if (worker_hdl != NULL) *worker_hdl = NULL; |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 716 | /* Make sure we appear kicked */ |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 717 | SET_KICK_STATE(worker, KICKED); |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 718 | grpc_closure_list_move(&worker->schedule_on_end_work, |
| 719 | &exec_ctx->closure_list); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 720 | if (gpr_atm_no_barrier_load(&g_active_poller) == (gpr_atm)worker) { |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 721 | if (worker->next != worker && worker->next->kick_state == UNKICKED) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 722 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 723 | gpr_log(GPR_DEBUG, " .. choose next poller to be peer %p", worker); |
| 724 | } |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 725 | GPR_ASSERT(worker->next->initialized_cv); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 726 | gpr_atm_no_barrier_store(&g_active_poller, (gpr_atm)worker->next); |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 727 | SET_KICK_STATE(worker->next, DESIGNATED_POLLER); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 728 | gpr_cv_signal(&worker->next->cv); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 729 | if (grpc_exec_ctx_has_work(exec_ctx)) { |
| 730 | gpr_mu_unlock(&pollset->mu); |
| 731 | grpc_exec_ctx_flush(exec_ctx); |
| 732 | gpr_mu_lock(&pollset->mu); |
| 733 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 734 | } else { |
| 735 | gpr_atm_no_barrier_store(&g_active_poller, 0); |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 736 | size_t poller_neighbourhood_idx = |
| 737 | (size_t)(pollset->neighbourhood - g_neighbourhoods); |
Craig Tiller | bb74267 | 2017-05-17 22:19:05 +0000 | [diff] [blame] | 738 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 739 | bool found_worker = false; |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 740 | bool scan_state[MAX_NEIGHBOURHOODS]; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 741 | for (size_t i = 0; !found_worker && i < g_num_neighbourhoods; i++) { |
| 742 | pollset_neighbourhood *neighbourhood = |
| 743 | &g_neighbourhoods[(poller_neighbourhood_idx + i) % |
| 744 | g_num_neighbourhoods]; |
| 745 | if (gpr_mu_trylock(&neighbourhood->mu)) { |
| 746 | found_worker = |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 747 | check_neighbourhood_for_available_poller(neighbourhood); |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 748 | gpr_mu_unlock(&neighbourhood->mu); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 749 | scan_state[i] = true; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 750 | } else { |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 751 | scan_state[i] = false; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 752 | } |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 753 | } |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 754 | for (size_t i = 0; !found_worker && i < g_num_neighbourhoods; i++) { |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 755 | if (scan_state[i]) continue; |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 756 | pollset_neighbourhood *neighbourhood = |
| 757 | &g_neighbourhoods[(poller_neighbourhood_idx + i) % |
| 758 | g_num_neighbourhoods]; |
| 759 | gpr_mu_lock(&neighbourhood->mu); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 760 | found_worker = check_neighbourhood_for_available_poller(neighbourhood); |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 761 | gpr_mu_unlock(&neighbourhood->mu); |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 762 | } |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 763 | grpc_exec_ctx_flush(exec_ctx); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 764 | gpr_mu_lock(&pollset->mu); |
| 765 | } |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 766 | } else if (grpc_exec_ctx_has_work(exec_ctx)) { |
| 767 | gpr_mu_unlock(&pollset->mu); |
| 768 | grpc_exec_ctx_flush(exec_ctx); |
| 769 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 770 | } |
| 771 | if (worker->initialized_cv) { |
| 772 | gpr_cv_destroy(&worker->cv); |
| 773 | } |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 774 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 775 | gpr_log(GPR_DEBUG, " .. remove worker"); |
| 776 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 777 | if (EMPTIED == worker_remove(pollset, worker)) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 778 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
| 779 | } |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 780 | 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] | 781 | } |
| 782 | |
| 783 | /* pollset->po.mu lock must be held by the caller before calling this. |
| 784 | The function pollset_work() may temporarily release the lock (pollset->po.mu) |
| 785 | during the course of its execution but it will always re-acquire the lock and |
| 786 | ensure that it is held by the time the function returns */ |
| 787 | static grpc_error *pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 788 | grpc_pollset_worker **worker_hdl, |
| 789 | gpr_timespec now, gpr_timespec deadline) { |
| 790 | grpc_pollset_worker worker; |
| 791 | grpc_error *error = GRPC_ERROR_NONE; |
| 792 | static const char *err_desc = "pollset_work"; |
| 793 | if (pollset->kicked_without_poller) { |
| 794 | pollset->kicked_without_poller = false; |
| 795 | return GRPC_ERROR_NONE; |
| 796 | } |
| 797 | if (begin_worker(pollset, &worker, worker_hdl, &now, deadline)) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 798 | gpr_tls_set(&g_current_thread_pollset, (intptr_t)pollset); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 799 | gpr_tls_set(&g_current_thread_worker, (intptr_t)&worker); |
Craig Tiller | c81512a | 2017-05-26 09:53:58 -0700 | [diff] [blame] | 800 | GPR_ASSERT(!pollset->shutting_down); |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 801 | GPR_ASSERT(!pollset->seen_inactive); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 802 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 803 | append_error(&error, pollset_epoll(exec_ctx, pollset, now, deadline), |
| 804 | err_desc); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 805 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 806 | gpr_tls_set(&g_current_thread_worker, 0); |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 807 | } else { |
| 808 | gpr_tls_set(&g_current_thread_pollset, (intptr_t)pollset); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 809 | } |
| 810 | end_worker(exec_ctx, pollset, &worker, worker_hdl); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 811 | gpr_tls_set(&g_current_thread_pollset, 0); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 812 | return error; |
| 813 | } |
| 814 | |
| 815 | static grpc_error *pollset_kick(grpc_pollset *pollset, |
| 816 | grpc_pollset_worker *specific_worker) { |
Craig Tiller | b89bac0 | 2017-05-26 15:20:32 +0000 | [diff] [blame] | 817 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 818 | gpr_strvec log; |
| 819 | gpr_strvec_init(&log); |
| 820 | char *tmp; |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 821 | gpr_asprintf( |
| 822 | &tmp, "PS:%p KICK:%p curps=%p curworker=%p root=%p", pollset, |
| 823 | specific_worker, (void *)gpr_tls_get(&g_current_thread_pollset), |
| 824 | (void *)gpr_tls_get(&g_current_thread_worker), pollset->root_worker); |
Craig Tiller | b89bac0 | 2017-05-26 15:20:32 +0000 | [diff] [blame] | 825 | gpr_strvec_add(&log, tmp); |
| 826 | if (pollset->root_worker != NULL) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 827 | gpr_asprintf(&tmp, " {kick_state=%s next=%p {kick_state=%s}}", |
| 828 | kick_state_string(pollset->root_worker->kick_state), |
| 829 | pollset->root_worker->next, |
| 830 | kick_state_string(pollset->root_worker->next->kick_state)); |
Craig Tiller | b89bac0 | 2017-05-26 15:20:32 +0000 | [diff] [blame] | 831 | gpr_strvec_add(&log, tmp); |
| 832 | } |
| 833 | if (specific_worker != NULL) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 834 | gpr_asprintf(&tmp, " worker_kick_state=%s", |
| 835 | kick_state_string(specific_worker->kick_state)); |
Craig Tiller | b89bac0 | 2017-05-26 15:20:32 +0000 | [diff] [blame] | 836 | gpr_strvec_add(&log, tmp); |
| 837 | } |
| 838 | tmp = gpr_strvec_flatten(&log, NULL); |
| 839 | gpr_strvec_destroy(&log); |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 840 | gpr_log(GPR_ERROR, "%s", tmp); |
Craig Tiller | b89bac0 | 2017-05-26 15:20:32 +0000 | [diff] [blame] | 841 | gpr_free(tmp); |
| 842 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 843 | if (specific_worker == NULL) { |
| 844 | if (gpr_tls_get(&g_current_thread_pollset) != (intptr_t)pollset) { |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 845 | grpc_pollset_worker *root_worker = pollset->root_worker; |
| 846 | if (root_worker == NULL) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 847 | pollset->kicked_without_poller = true; |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 848 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 849 | gpr_log(GPR_ERROR, " .. kicked_without_poller"); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 850 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 851 | return GRPC_ERROR_NONE; |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 852 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 853 | grpc_pollset_worker *next_worker = root_worker->next; |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 854 | if (root_worker->kick_state == KICKED) { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 855 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 856 | gpr_log(GPR_ERROR, " .. already kicked %p", root_worker); |
| 857 | } |
| 858 | SET_KICK_STATE(root_worker, KICKED); |
| 859 | return GRPC_ERROR_NONE; |
| 860 | } else if (next_worker->kick_state == KICKED) { |
| 861 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 862 | gpr_log(GPR_ERROR, " .. already kicked %p", next_worker); |
| 863 | } |
| 864 | SET_KICK_STATE(next_worker, KICKED); |
| 865 | return GRPC_ERROR_NONE; |
| 866 | } else if (root_worker == |
| 867 | next_worker && // only try and wake up a poller if |
| 868 | // there is no next worker |
| 869 | root_worker == (grpc_pollset_worker *)gpr_atm_no_barrier_load( |
| 870 | &g_active_poller)) { |
| 871 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 872 | gpr_log(GPR_ERROR, " .. kicked %p", root_worker); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 873 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 874 | SET_KICK_STATE(root_worker, KICKED); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 875 | return grpc_wakeup_fd_wakeup(&global_wakeup_fd); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 876 | } else if (next_worker->kick_state == UNKICKED) { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 877 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 878 | gpr_log(GPR_ERROR, " .. kicked %p", next_worker); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 879 | } |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 880 | GPR_ASSERT(next_worker->initialized_cv); |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 881 | SET_KICK_STATE(next_worker, KICKED); |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 882 | gpr_cv_signal(&next_worker->cv); |
| 883 | return GRPC_ERROR_NONE; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 884 | } else if (next_worker->kick_state == DESIGNATED_POLLER) { |
| 885 | if (root_worker->kick_state != DESIGNATED_POLLER) { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 886 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 887 | gpr_log( |
| 888 | GPR_ERROR, |
| 889 | " .. kicked root non-poller %p (initialized_cv=%d) (poller=%p)", |
| 890 | root_worker, root_worker->initialized_cv, next_worker); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 891 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 892 | SET_KICK_STATE(root_worker, KICKED); |
| 893 | if (root_worker->initialized_cv) { |
| 894 | gpr_cv_signal(&root_worker->cv); |
| 895 | } |
| 896 | return GRPC_ERROR_NONE; |
| 897 | } else { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 898 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 899 | gpr_log(GPR_ERROR, " .. non-root poller %p (root=%p)", next_worker, |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 900 | root_worker); |
| 901 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 902 | SET_KICK_STATE(next_worker, KICKED); |
| 903 | return grpc_wakeup_fd_wakeup(&global_wakeup_fd); |
| 904 | } |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 905 | } else { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 906 | GPR_ASSERT(next_worker->kick_state == KICKED); |
| 907 | SET_KICK_STATE(next_worker, KICKED); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 908 | return GRPC_ERROR_NONE; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 909 | } |
| 910 | } else { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 911 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 912 | gpr_log(GPR_ERROR, " .. kicked while waking up"); |
| 913 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 914 | return GRPC_ERROR_NONE; |
| 915 | } |
Craig Tiller | 43bf259 | 2017-04-28 23:21:01 +0000 | [diff] [blame] | 916 | } else if (specific_worker->kick_state == KICKED) { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 917 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 918 | gpr_log(GPR_ERROR, " .. specific worker already kicked"); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 919 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 920 | return GRPC_ERROR_NONE; |
| 921 | } else if (gpr_tls_get(&g_current_thread_worker) == |
| 922 | (intptr_t)specific_worker) { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 923 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 924 | gpr_log(GPR_ERROR, " .. mark %p kicked", specific_worker); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 925 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 926 | SET_KICK_STATE(specific_worker, KICKED); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 927 | return GRPC_ERROR_NONE; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 928 | } else if (specific_worker == |
| 929 | (grpc_pollset_worker *)gpr_atm_no_barrier_load(&g_active_poller)) { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 930 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 931 | gpr_log(GPR_ERROR, " .. kick active poller"); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 932 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 933 | SET_KICK_STATE(specific_worker, KICKED); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 934 | return grpc_wakeup_fd_wakeup(&global_wakeup_fd); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 935 | } else if (specific_worker->initialized_cv) { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 936 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 937 | gpr_log(GPR_ERROR, " .. kick waiting worker"); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 938 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 939 | SET_KICK_STATE(specific_worker, KICKED); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 940 | gpr_cv_signal(&specific_worker->cv); |
| 941 | return GRPC_ERROR_NONE; |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 942 | } else { |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 943 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 944 | gpr_log(GPR_ERROR, " .. kick non-waiting worker"); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 945 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 946 | SET_KICK_STATE(specific_worker, KICKED); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 947 | return GRPC_ERROR_NONE; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 948 | } |
| 949 | } |
| 950 | |
| 951 | static void pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 952 | grpc_fd *fd) {} |
| 953 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 954 | /******************************************************************************* |
| 955 | * Workqueue Definitions |
| 956 | */ |
| 957 | |
| 958 | #ifdef GRPC_WORKQUEUE_REFCOUNT_DEBUG |
| 959 | static grpc_workqueue *workqueue_ref(grpc_workqueue *workqueue, |
| 960 | const char *file, int line, |
| 961 | const char *reason) { |
| 962 | return workqueue; |
| 963 | } |
| 964 | |
| 965 | static void workqueue_unref(grpc_exec_ctx *exec_ctx, grpc_workqueue *workqueue, |
| 966 | const char *file, int line, const char *reason) {} |
| 967 | #else |
| 968 | static grpc_workqueue *workqueue_ref(grpc_workqueue *workqueue) { |
| 969 | return workqueue; |
| 970 | } |
| 971 | |
| 972 | static void workqueue_unref(grpc_exec_ctx *exec_ctx, |
| 973 | grpc_workqueue *workqueue) {} |
| 974 | #endif |
| 975 | |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 976 | static void wq_sched(grpc_exec_ctx *exec_ctx, grpc_closure *closure, |
| 977 | grpc_error *error) { |
| 978 | // find a neighbourhood to wakeup |
| 979 | bool scheduled = false; |
| 980 | size_t initial_neighbourhood = choose_neighbourhood(); |
| 981 | for (size_t i = 0; !scheduled && i < g_num_neighbourhoods; i++) { |
| 982 | pollset_neighbourhood *neighbourhood = |
| 983 | &g_neighbourhoods[(initial_neighbourhood + i) % g_num_neighbourhoods]; |
| 984 | if (gpr_mu_trylock(&neighbourhood->mu)) { |
| 985 | if (neighbourhood->active_root != NULL) { |
| 986 | grpc_pollset *inspect = neighbourhood->active_root; |
| 987 | do { |
| 988 | if (gpr_mu_trylock(&inspect->mu)) { |
| 989 | if (inspect->root_worker != NULL) { |
| 990 | grpc_pollset_worker *inspect_worker = inspect->root_worker; |
| 991 | do { |
| 992 | if (inspect_worker->kick_state == UNKICKED) { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 993 | SET_KICK_STATE(inspect_worker, KICKED); |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 994 | grpc_closure_list_append( |
| 995 | &inspect_worker->schedule_on_end_work, closure, error); |
| 996 | if (inspect_worker->initialized_cv) { |
| 997 | gpr_cv_signal(&inspect_worker->cv); |
| 998 | } |
| 999 | scheduled = true; |
| 1000 | } |
| 1001 | inspect_worker = inspect_worker->next; |
| 1002 | } while (!scheduled && inspect_worker != inspect->root_worker); |
| 1003 | } |
| 1004 | gpr_mu_unlock(&inspect->mu); |
| 1005 | } |
| 1006 | inspect = inspect->next; |
| 1007 | } while (!scheduled && inspect != neighbourhood->active_root); |
| 1008 | } |
| 1009 | gpr_mu_unlock(&neighbourhood->mu); |
| 1010 | } |
| 1011 | } |
| 1012 | if (!scheduled) { |
Craig Tiller | 67e229e | 2017-05-01 20:57:59 +0000 | [diff] [blame] | 1013 | gpr_mu_lock(&g_wq_mu); |
| 1014 | grpc_closure_list_append(&g_wq_items, closure, error); |
| 1015 | gpr_mu_unlock(&g_wq_mu); |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 1016 | GRPC_LOG_IF_ERROR("workqueue_scheduler", |
| 1017 | grpc_wakeup_fd_wakeup(&global_wakeup_fd)); |
| 1018 | } |
| 1019 | } |
| 1020 | |
| 1021 | static const grpc_closure_scheduler_vtable |
| 1022 | singleton_workqueue_scheduler_vtable = {wq_sched, wq_sched, |
| 1023 | "epoll1_workqueue"}; |
| 1024 | |
| 1025 | static grpc_closure_scheduler singleton_workqueue_scheduler = { |
| 1026 | &singleton_workqueue_scheduler_vtable}; |
| 1027 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1028 | static grpc_closure_scheduler *workqueue_scheduler(grpc_workqueue *workqueue) { |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 1029 | return &singleton_workqueue_scheduler; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1030 | } |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1031 | |
| 1032 | /******************************************************************************* |
| 1033 | * Pollset-set Definitions |
| 1034 | */ |
| 1035 | |
| 1036 | static grpc_pollset_set *pollset_set_create(void) { |
| 1037 | return (grpc_pollset_set *)((intptr_t)0xdeafbeef); |
| 1038 | } |
| 1039 | |
| 1040 | static void pollset_set_destroy(grpc_exec_ctx *exec_ctx, |
| 1041 | grpc_pollset_set *pss) {} |
| 1042 | |
| 1043 | static void pollset_set_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset_set *pss, |
| 1044 | grpc_fd *fd) {} |
| 1045 | |
| 1046 | static void pollset_set_del_fd(grpc_exec_ctx *exec_ctx, grpc_pollset_set *pss, |
| 1047 | grpc_fd *fd) {} |
| 1048 | |
| 1049 | static void pollset_set_add_pollset(grpc_exec_ctx *exec_ctx, |
| 1050 | grpc_pollset_set *pss, grpc_pollset *ps) {} |
| 1051 | |
| 1052 | static void pollset_set_del_pollset(grpc_exec_ctx *exec_ctx, |
| 1053 | grpc_pollset_set *pss, grpc_pollset *ps) {} |
| 1054 | |
| 1055 | static void pollset_set_add_pollset_set(grpc_exec_ctx *exec_ctx, |
| 1056 | grpc_pollset_set *bag, |
| 1057 | grpc_pollset_set *item) {} |
| 1058 | |
| 1059 | static void pollset_set_del_pollset_set(grpc_exec_ctx *exec_ctx, |
| 1060 | grpc_pollset_set *bag, |
| 1061 | grpc_pollset_set *item) {} |
| 1062 | |
| 1063 | /******************************************************************************* |
| 1064 | * Event engine binding |
| 1065 | */ |
| 1066 | |
| 1067 | static void shutdown_engine(void) { |
| 1068 | fd_global_shutdown(); |
| 1069 | pollset_global_shutdown(); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1070 | } |
| 1071 | |
| 1072 | static const grpc_event_engine_vtable vtable = { |
| 1073 | .pollset_size = sizeof(grpc_pollset), |
| 1074 | |
| 1075 | .fd_create = fd_create, |
| 1076 | .fd_wrapped_fd = fd_wrapped_fd, |
| 1077 | .fd_orphan = fd_orphan, |
| 1078 | .fd_shutdown = fd_shutdown, |
| 1079 | .fd_is_shutdown = fd_is_shutdown, |
| 1080 | .fd_notify_on_read = fd_notify_on_read, |
| 1081 | .fd_notify_on_write = fd_notify_on_write, |
| 1082 | .fd_get_read_notifier_pollset = fd_get_read_notifier_pollset, |
| 1083 | .fd_get_workqueue = fd_get_workqueue, |
| 1084 | |
| 1085 | .pollset_init = pollset_init, |
| 1086 | .pollset_shutdown = pollset_shutdown, |
| 1087 | .pollset_destroy = pollset_destroy, |
| 1088 | .pollset_work = pollset_work, |
| 1089 | .pollset_kick = pollset_kick, |
| 1090 | .pollset_add_fd = pollset_add_fd, |
| 1091 | |
| 1092 | .pollset_set_create = pollset_set_create, |
| 1093 | .pollset_set_destroy = pollset_set_destroy, |
| 1094 | .pollset_set_add_pollset = pollset_set_add_pollset, |
| 1095 | .pollset_set_del_pollset = pollset_set_del_pollset, |
| 1096 | .pollset_set_add_pollset_set = pollset_set_add_pollset_set, |
| 1097 | .pollset_set_del_pollset_set = pollset_set_del_pollset_set, |
| 1098 | .pollset_set_add_fd = pollset_set_add_fd, |
| 1099 | .pollset_set_del_fd = pollset_set_del_fd, |
| 1100 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1101 | .workqueue_ref = workqueue_ref, |
| 1102 | .workqueue_unref = workqueue_unref, |
| 1103 | .workqueue_scheduler = workqueue_scheduler, |
| 1104 | |
| 1105 | .shutdown_engine = shutdown_engine, |
| 1106 | }; |
| 1107 | |
| 1108 | /* It is possible that GLIBC has epoll but the underlying kernel doesn't. |
| 1109 | * Create a dummy epoll_fd to make sure epoll support is available */ |
Craig Tiller | 6f0af49 | 2017-04-27 19:26:16 +0000 | [diff] [blame] | 1110 | const grpc_event_engine_vtable *grpc_init_epoll1_linux(bool explicit_request) { |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1111 | if (!grpc_has_wakeup_fd()) { |
| 1112 | return NULL; |
| 1113 | } |
| 1114 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1115 | g_epfd = epoll_create1(EPOLL_CLOEXEC); |
| 1116 | if (g_epfd < 0) { |
| 1117 | gpr_log(GPR_ERROR, "epoll unavailable"); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1118 | return NULL; |
| 1119 | } |
| 1120 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1121 | fd_global_init(); |
| 1122 | |
| 1123 | if (!GRPC_LOG_IF_ERROR("pollset_global_init", pollset_global_init())) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1124 | close(g_epfd); |
| 1125 | fd_global_shutdown(); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1126 | return NULL; |
| 1127 | } |
| 1128 | |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame^] | 1129 | gpr_log(GPR_ERROR, "grpc epoll fd: %d", g_epfd); |
| 1130 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1131 | return &vtable; |
| 1132 | } |
| 1133 | |
| 1134 | #else /* defined(GRPC_LINUX_EPOLL) */ |
| 1135 | #if defined(GRPC_POSIX_SOCKET) |
| 1136 | #include "src/core/lib/iomgr/ev_posix.h" |
| 1137 | /* If GRPC_LINUX_EPOLL is not defined, it means epoll is not available. Return |
| 1138 | * NULL */ |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 1139 | const grpc_event_engine_vtable *grpc_init_epoll1_linux(bool explicit_request) { |
| 1140 | return NULL; |
| 1141 | } |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1142 | #endif /* defined(GRPC_POSIX_SOCKET) */ |
| 1143 | #endif /* !defined(GRPC_LINUX_EPOLL) */ |