Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright 2015-2016, Google Inc. |
| 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 | |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 34 | #include <grpc/support/port_platform.h> |
| 35 | |
| 36 | #ifdef GPR_POSIX_SOCKET |
| 37 | |
Craig Tiller | d9a60bb | 2016-03-28 23:13:19 -0700 | [diff] [blame] | 38 | #include "src/core/lib/iomgr/ev_poll_posix.h" |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 39 | |
| 40 | #include <assert.h> |
| 41 | #include <errno.h> |
| 42 | #include <poll.h> |
| 43 | #include <string.h> |
| 44 | #include <sys/socket.h> |
| 45 | #include <unistd.h> |
| 46 | |
| 47 | #include <grpc/support/alloc.h> |
| 48 | #include <grpc/support/log.h> |
| 49 | #include <grpc/support/string_util.h> |
| 50 | #include <grpc/support/tls.h> |
| 51 | #include <grpc/support/useful.h> |
| 52 | |
Craig Tiller | d9a60bb | 2016-03-28 23:13:19 -0700 | [diff] [blame] | 53 | #include "src/core/lib/iomgr/iomgr_internal.h" |
| 54 | #include "src/core/lib/iomgr/wakeup_fd_posix.h" |
| 55 | #include "src/core/lib/profiling/timers.h" |
| 56 | #include "src/core/lib/support/block_annotate.h" |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 57 | |
| 58 | /******************************************************************************* |
| 59 | * FD declarations |
| 60 | */ |
| 61 | |
| 62 | typedef struct grpc_fd_watcher { |
| 63 | struct grpc_fd_watcher *next; |
| 64 | struct grpc_fd_watcher *prev; |
| 65 | grpc_pollset *pollset; |
| 66 | grpc_pollset_worker *worker; |
| 67 | grpc_fd *fd; |
| 68 | } grpc_fd_watcher; |
| 69 | |
| 70 | struct grpc_fd { |
| 71 | int fd; |
| 72 | /* refst format: |
| 73 | bit0: 1=active/0=orphaned |
| 74 | bit1-n: refcount |
| 75 | meaning that mostly we ref by two to avoid altering the orphaned bit, |
| 76 | and just unref by 1 when we're ready to flag the object as orphaned */ |
| 77 | gpr_atm refst; |
| 78 | |
| 79 | gpr_mu mu; |
| 80 | int shutdown; |
| 81 | int closed; |
| 82 | int released; |
| 83 | |
| 84 | /* The watcher list. |
| 85 | |
| 86 | The following watcher related fields are protected by watcher_mu. |
| 87 | |
| 88 | An fd_watcher is an ephemeral object created when an fd wants to |
| 89 | begin polling, and destroyed after the poll. |
| 90 | |
| 91 | It denotes the fd's interest in whether to read poll or write poll |
| 92 | or both or neither on this fd. |
| 93 | |
| 94 | If a watcher is asked to poll for reads or writes, the read_watcher |
| 95 | or write_watcher fields are set respectively. A watcher may be asked |
| 96 | to poll for both, in which case both fields will be set. |
| 97 | |
| 98 | read_watcher and write_watcher may be NULL if no watcher has been |
| 99 | asked to poll for reads or writes. |
| 100 | |
| 101 | If an fd_watcher is not asked to poll for reads or writes, it's added |
| 102 | to a linked list of inactive watchers, rooted at inactive_watcher_root. |
| 103 | If at a later time there becomes need of a poller to poll, one of |
| 104 | the inactive pollers may be kicked out of their poll loops to take |
| 105 | that responsibility. */ |
| 106 | grpc_fd_watcher inactive_watcher_root; |
| 107 | grpc_fd_watcher *read_watcher; |
| 108 | grpc_fd_watcher *write_watcher; |
| 109 | |
| 110 | grpc_closure *read_closure; |
| 111 | grpc_closure *write_closure; |
| 112 | |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 113 | grpc_closure *on_done_closure; |
| 114 | |
| 115 | grpc_iomgr_object iomgr_object; |
| 116 | }; |
| 117 | |
| 118 | /* Begin polling on an fd. |
| 119 | Registers that the given pollset is interested in this fd - so that if read |
| 120 | or writability interest changes, the pollset can be kicked to pick up that |
| 121 | new interest. |
| 122 | Return value is: |
| 123 | (fd_needs_read? read_mask : 0) | (fd_needs_write? write_mask : 0) |
| 124 | i.e. a combination of read_mask and write_mask determined by the fd's current |
| 125 | interest in said events. |
| 126 | Polling strategies that do not need to alter their behavior depending on the |
| 127 | fd's current interest (such as epoll) do not need to call this function. |
| 128 | MUST NOT be called with a pollset lock taken */ |
| 129 | static uint32_t fd_begin_poll(grpc_fd *fd, grpc_pollset *pollset, |
| 130 | grpc_pollset_worker *worker, uint32_t read_mask, |
| 131 | uint32_t write_mask, grpc_fd_watcher *rec); |
| 132 | /* Complete polling previously started with fd_begin_poll |
| 133 | MUST NOT be called with a pollset lock taken |
| 134 | if got_read or got_write are 1, also does the become_{readable,writable} as |
| 135 | appropriate. */ |
| 136 | static void fd_end_poll(grpc_exec_ctx *exec_ctx, grpc_fd_watcher *rec, |
| 137 | int got_read, int got_write); |
| 138 | |
| 139 | /* Return 1 if this fd is orphaned, 0 otherwise */ |
| 140 | static bool fd_is_orphaned(grpc_fd *fd); |
| 141 | |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 142 | /* Reference counting for fds */ |
| 143 | /*#define GRPC_FD_REF_COUNT_DEBUG*/ |
| 144 | #ifdef GRPC_FD_REF_COUNT_DEBUG |
| 145 | static void fd_ref(grpc_fd *fd, const char *reason, const char *file, int line); |
| 146 | static void fd_unref(grpc_fd *fd, const char *reason, const char *file, |
| 147 | int line); |
| 148 | #define GRPC_FD_REF(fd, reason) fd_ref(fd, reason, __FILE__, __LINE__) |
| 149 | #define GRPC_FD_UNREF(fd, reason) fd_unref(fd, reason, __FILE__, __LINE__) |
| 150 | #else |
| 151 | static void fd_ref(grpc_fd *fd); |
| 152 | static void fd_unref(grpc_fd *fd); |
| 153 | #define GRPC_FD_REF(fd, reason) fd_ref(fd) |
| 154 | #define GRPC_FD_UNREF(fd, reason) fd_unref(fd) |
| 155 | #endif |
| 156 | |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 157 | #define CLOSURE_NOT_READY ((grpc_closure *)0) |
| 158 | #define CLOSURE_READY ((grpc_closure *)1) |
| 159 | |
| 160 | /******************************************************************************* |
| 161 | * pollset declarations |
| 162 | */ |
| 163 | |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 164 | typedef struct grpc_cached_wakeup_fd { |
| 165 | grpc_wakeup_fd fd; |
| 166 | struct grpc_cached_wakeup_fd *next; |
| 167 | } grpc_cached_wakeup_fd; |
| 168 | |
| 169 | struct grpc_pollset_worker { |
| 170 | grpc_cached_wakeup_fd *wakeup_fd; |
| 171 | int reevaluate_polling_on_wakeup; |
| 172 | int kicked_specifically; |
| 173 | struct grpc_pollset_worker *next; |
| 174 | struct grpc_pollset_worker *prev; |
| 175 | }; |
| 176 | |
| 177 | struct grpc_pollset { |
Craig Tiller | ac04b7f | 2016-02-26 08:36:44 -0800 | [diff] [blame] | 178 | gpr_mu mu; |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 179 | grpc_pollset_worker root_worker; |
| 180 | int in_flight_cbs; |
| 181 | int shutting_down; |
| 182 | int called_shutdown; |
| 183 | int kicked_without_pollers; |
| 184 | grpc_closure *shutdown_done; |
| 185 | grpc_closure_list idle_jobs; |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 186 | /* all polled fds */ |
| 187 | size_t fd_count; |
| 188 | size_t fd_capacity; |
| 189 | grpc_fd **fds; |
| 190 | /* fds that have been removed from the pollset explicitly */ |
| 191 | size_t del_count; |
| 192 | size_t del_capacity; |
| 193 | grpc_fd **dels; |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 194 | /* Local cache of eventfds for workers */ |
| 195 | grpc_cached_wakeup_fd *local_wakeup_cache; |
| 196 | }; |
| 197 | |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 198 | /* Add an fd to a pollset */ |
| 199 | static void pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 200 | struct grpc_fd *fd); |
| 201 | |
| 202 | static void pollset_set_add_fd(grpc_exec_ctx *exec_ctx, |
| 203 | grpc_pollset_set *pollset_set, grpc_fd *fd); |
| 204 | |
| 205 | /* Convert a timespec to milliseconds: |
| 206 | - very small or negative poll times are clamped to zero to do a |
| 207 | non-blocking poll (which becomes spin polling) |
| 208 | - other small values are rounded up to one millisecond |
| 209 | - longer than a millisecond polls are rounded up to the next nearest |
| 210 | millisecond to avoid spinning |
| 211 | - infinite timeouts are converted to -1 */ |
| 212 | static int poll_deadline_to_millis_timeout(gpr_timespec deadline, |
| 213 | gpr_timespec now); |
| 214 | |
| 215 | /* Allow kick to wakeup the currently polling worker */ |
| 216 | #define GRPC_POLLSET_CAN_KICK_SELF 1 |
| 217 | /* Force the wakee to repoll when awoken */ |
| 218 | #define GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP 2 |
| 219 | /* As per pollset_kick, with an extended set of flags (defined above) |
| 220 | -- mostly for fd_posix's use. */ |
| 221 | static void pollset_kick_ext(grpc_pollset *p, |
| 222 | grpc_pollset_worker *specific_worker, |
| 223 | uint32_t flags); |
| 224 | |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 225 | /* Return 1 if the pollset has active threads in pollset_work (pollset must |
| 226 | * be locked) */ |
| 227 | static int pollset_has_workers(grpc_pollset *pollset); |
| 228 | |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 229 | /******************************************************************************* |
| 230 | * pollset_set definitions |
| 231 | */ |
| 232 | |
| 233 | struct grpc_pollset_set { |
| 234 | gpr_mu mu; |
| 235 | |
| 236 | size_t pollset_count; |
| 237 | size_t pollset_capacity; |
| 238 | grpc_pollset **pollsets; |
| 239 | |
| 240 | size_t pollset_set_count; |
| 241 | size_t pollset_set_capacity; |
| 242 | struct grpc_pollset_set **pollset_sets; |
| 243 | |
| 244 | size_t fd_count; |
| 245 | size_t fd_capacity; |
| 246 | grpc_fd **fds; |
| 247 | }; |
| 248 | |
| 249 | /******************************************************************************* |
| 250 | * fd_posix.c |
| 251 | */ |
| 252 | |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 253 | #ifdef GRPC_FD_REF_COUNT_DEBUG |
| 254 | #define REF_BY(fd, n, reason) ref_by(fd, n, reason, __FILE__, __LINE__) |
| 255 | #define UNREF_BY(fd, n, reason) unref_by(fd, n, reason, __FILE__, __LINE__) |
| 256 | static void ref_by(grpc_fd *fd, int n, const char *reason, const char *file, |
| 257 | int line) { |
| 258 | gpr_log(GPR_DEBUG, "FD %d %p ref %d %d -> %d [%s; %s:%d]", fd->fd, fd, n, |
| 259 | gpr_atm_no_barrier_load(&fd->refst), |
| 260 | gpr_atm_no_barrier_load(&fd->refst) + n, reason, file, line); |
| 261 | #else |
| 262 | #define REF_BY(fd, n, reason) ref_by(fd, n) |
| 263 | #define UNREF_BY(fd, n, reason) unref_by(fd, n) |
| 264 | static void ref_by(grpc_fd *fd, int n) { |
| 265 | #endif |
| 266 | GPR_ASSERT(gpr_atm_no_barrier_fetch_add(&fd->refst, n) > 0); |
| 267 | } |
| 268 | |
| 269 | #ifdef GRPC_FD_REF_COUNT_DEBUG |
| 270 | static void unref_by(grpc_fd *fd, int n, const char *reason, const char *file, |
| 271 | int line) { |
| 272 | gpr_atm old; |
| 273 | gpr_log(GPR_DEBUG, "FD %d %p unref %d %d -> %d [%s; %s:%d]", fd->fd, fd, n, |
| 274 | gpr_atm_no_barrier_load(&fd->refst), |
| 275 | gpr_atm_no_barrier_load(&fd->refst) - n, reason, file, line); |
| 276 | #else |
| 277 | static void unref_by(grpc_fd *fd, int n) { |
| 278 | gpr_atm old; |
| 279 | #endif |
| 280 | old = gpr_atm_full_fetch_add(&fd->refst, -n); |
| 281 | if (old == n) { |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 282 | gpr_mu_destroy(&fd->mu); |
Craig Tiller | b38197e | 2016-02-26 10:14:54 -0800 | [diff] [blame] | 283 | grpc_iomgr_unregister_object(&fd->iomgr_object); |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 284 | gpr_free(fd); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 285 | } else { |
| 286 | GPR_ASSERT(old > n); |
| 287 | } |
| 288 | } |
| 289 | |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 290 | static grpc_fd *fd_create(int fd, const char *name) { |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 291 | grpc_fd *r = gpr_malloc(sizeof(*r)); |
| 292 | gpr_mu_init(&r->mu); |
| 293 | gpr_atm_rel_store(&r->refst, 1); |
| 294 | r->shutdown = 0; |
| 295 | r->read_closure = CLOSURE_NOT_READY; |
| 296 | r->write_closure = CLOSURE_NOT_READY; |
| 297 | r->fd = fd; |
| 298 | r->inactive_watcher_root.next = r->inactive_watcher_root.prev = |
| 299 | &r->inactive_watcher_root; |
| 300 | r->read_watcher = r->write_watcher = NULL; |
| 301 | r->on_done_closure = NULL; |
| 302 | r->closed = 0; |
| 303 | r->released = 0; |
| 304 | |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 305 | char *name2; |
| 306 | gpr_asprintf(&name2, "%s fd=%d", name, fd); |
| 307 | grpc_iomgr_register_object(&r->iomgr_object, name2); |
| 308 | gpr_free(name2); |
| 309 | #ifdef GRPC_FD_REF_COUNT_DEBUG |
| 310 | gpr_log(GPR_DEBUG, "FD %d %p create %s", fd, r, name); |
| 311 | #endif |
| 312 | return r; |
| 313 | } |
| 314 | |
| 315 | static bool fd_is_orphaned(grpc_fd *fd) { |
| 316 | return (gpr_atm_acq_load(&fd->refst) & 1) == 0; |
| 317 | } |
| 318 | |
| 319 | static void pollset_kick_locked(grpc_fd_watcher *watcher) { |
Craig Tiller | ac04b7f | 2016-02-26 08:36:44 -0800 | [diff] [blame] | 320 | gpr_mu_lock(&watcher->pollset->mu); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 321 | GPR_ASSERT(watcher->worker); |
| 322 | pollset_kick_ext(watcher->pollset, watcher->worker, |
| 323 | GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP); |
Craig Tiller | ac04b7f | 2016-02-26 08:36:44 -0800 | [diff] [blame] | 324 | gpr_mu_unlock(&watcher->pollset->mu); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 325 | } |
| 326 | |
| 327 | static void maybe_wake_one_watcher_locked(grpc_fd *fd) { |
| 328 | if (fd->inactive_watcher_root.next != &fd->inactive_watcher_root) { |
| 329 | pollset_kick_locked(fd->inactive_watcher_root.next); |
| 330 | } else if (fd->read_watcher) { |
| 331 | pollset_kick_locked(fd->read_watcher); |
| 332 | } else if (fd->write_watcher) { |
| 333 | pollset_kick_locked(fd->write_watcher); |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | static void wake_all_watchers_locked(grpc_fd *fd) { |
| 338 | grpc_fd_watcher *watcher; |
| 339 | for (watcher = fd->inactive_watcher_root.next; |
| 340 | watcher != &fd->inactive_watcher_root; watcher = watcher->next) { |
| 341 | pollset_kick_locked(watcher); |
| 342 | } |
| 343 | if (fd->read_watcher) { |
| 344 | pollset_kick_locked(fd->read_watcher); |
| 345 | } |
| 346 | if (fd->write_watcher && fd->write_watcher != fd->read_watcher) { |
| 347 | pollset_kick_locked(fd->write_watcher); |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | static int has_watchers(grpc_fd *fd) { |
| 352 | return fd->read_watcher != NULL || fd->write_watcher != NULL || |
| 353 | fd->inactive_watcher_root.next != &fd->inactive_watcher_root; |
| 354 | } |
| 355 | |
| 356 | static void close_fd_locked(grpc_exec_ctx *exec_ctx, grpc_fd *fd) { |
| 357 | fd->closed = 1; |
| 358 | if (!fd->released) { |
| 359 | close(fd->fd); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 360 | } |
| 361 | grpc_exec_ctx_enqueue(exec_ctx, fd->on_done_closure, true, NULL); |
| 362 | } |
| 363 | |
| 364 | static int fd_wrapped_fd(grpc_fd *fd) { |
| 365 | if (fd->released || fd->closed) { |
| 366 | return -1; |
| 367 | } else { |
| 368 | return fd->fd; |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | static void fd_orphan(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 373 | grpc_closure *on_done, int *release_fd, |
| 374 | const char *reason) { |
| 375 | fd->on_done_closure = on_done; |
| 376 | fd->released = release_fd != NULL; |
| 377 | if (!fd->released) { |
| 378 | shutdown(fd->fd, SHUT_RDWR); |
| 379 | } else { |
| 380 | *release_fd = fd->fd; |
| 381 | } |
| 382 | gpr_mu_lock(&fd->mu); |
| 383 | REF_BY(fd, 1, reason); /* remove active status, but keep referenced */ |
| 384 | if (!has_watchers(fd)) { |
| 385 | close_fd_locked(exec_ctx, fd); |
| 386 | } else { |
| 387 | wake_all_watchers_locked(fd); |
| 388 | } |
| 389 | gpr_mu_unlock(&fd->mu); |
| 390 | UNREF_BY(fd, 2, reason); /* drop the reference */ |
| 391 | } |
| 392 | |
| 393 | /* increment refcount by two to avoid changing the orphan bit */ |
| 394 | #ifdef GRPC_FD_REF_COUNT_DEBUG |
| 395 | static void fd_ref(grpc_fd *fd, const char *reason, const char *file, |
| 396 | int line) { |
| 397 | ref_by(fd, 2, reason, file, line); |
| 398 | } |
| 399 | |
| 400 | static void fd_unref(grpc_fd *fd, const char *reason, const char *file, |
| 401 | int line) { |
| 402 | unref_by(fd, 2, reason, file, line); |
| 403 | } |
| 404 | #else |
| 405 | static void fd_ref(grpc_fd *fd) { ref_by(fd, 2); } |
| 406 | |
| 407 | static void fd_unref(grpc_fd *fd) { unref_by(fd, 2); } |
| 408 | #endif |
| 409 | |
| 410 | static void notify_on_locked(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 411 | grpc_closure **st, grpc_closure *closure) { |
| 412 | if (*st == CLOSURE_NOT_READY) { |
| 413 | /* not ready ==> switch to a waiting state by setting the closure */ |
| 414 | *st = closure; |
| 415 | } else if (*st == CLOSURE_READY) { |
| 416 | /* already ready ==> queue the closure to run immediately */ |
| 417 | *st = CLOSURE_NOT_READY; |
| 418 | grpc_exec_ctx_enqueue(exec_ctx, closure, !fd->shutdown, NULL); |
| 419 | maybe_wake_one_watcher_locked(fd); |
| 420 | } else { |
| 421 | /* upcallptr was set to a different closure. This is an error! */ |
| 422 | gpr_log(GPR_ERROR, |
| 423 | "User called a notify_on function with a previous callback still " |
| 424 | "pending"); |
| 425 | abort(); |
| 426 | } |
| 427 | } |
| 428 | |
| 429 | /* returns 1 if state becomes not ready */ |
| 430 | static int set_ready_locked(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 431 | grpc_closure **st) { |
| 432 | if (*st == CLOSURE_READY) { |
| 433 | /* duplicate ready ==> ignore */ |
| 434 | return 0; |
| 435 | } else if (*st == CLOSURE_NOT_READY) { |
| 436 | /* not ready, and not waiting ==> flag ready */ |
| 437 | *st = CLOSURE_READY; |
| 438 | return 0; |
| 439 | } else { |
| 440 | /* waiting ==> queue closure */ |
| 441 | grpc_exec_ctx_enqueue(exec_ctx, *st, !fd->shutdown, NULL); |
| 442 | *st = CLOSURE_NOT_READY; |
| 443 | return 1; |
| 444 | } |
| 445 | } |
| 446 | |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 447 | static void fd_shutdown(grpc_exec_ctx *exec_ctx, grpc_fd *fd) { |
| 448 | gpr_mu_lock(&fd->mu); |
| 449 | GPR_ASSERT(!fd->shutdown); |
| 450 | fd->shutdown = 1; |
| 451 | set_ready_locked(exec_ctx, fd, &fd->read_closure); |
| 452 | set_ready_locked(exec_ctx, fd, &fd->write_closure); |
| 453 | gpr_mu_unlock(&fd->mu); |
| 454 | } |
| 455 | |
| 456 | static void fd_notify_on_read(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 457 | grpc_closure *closure) { |
| 458 | gpr_mu_lock(&fd->mu); |
| 459 | notify_on_locked(exec_ctx, fd, &fd->read_closure, closure); |
| 460 | gpr_mu_unlock(&fd->mu); |
| 461 | } |
| 462 | |
| 463 | static void fd_notify_on_write(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 464 | grpc_closure *closure) { |
| 465 | gpr_mu_lock(&fd->mu); |
| 466 | notify_on_locked(exec_ctx, fd, &fd->write_closure, closure); |
| 467 | gpr_mu_unlock(&fd->mu); |
| 468 | } |
| 469 | |
| 470 | static uint32_t fd_begin_poll(grpc_fd *fd, grpc_pollset *pollset, |
| 471 | grpc_pollset_worker *worker, uint32_t read_mask, |
| 472 | uint32_t write_mask, grpc_fd_watcher *watcher) { |
| 473 | uint32_t mask = 0; |
| 474 | grpc_closure *cur; |
| 475 | int requested; |
| 476 | /* keep track of pollers that have requested our events, in case they change |
| 477 | */ |
| 478 | GRPC_FD_REF(fd, "poll"); |
| 479 | |
| 480 | gpr_mu_lock(&fd->mu); |
| 481 | |
| 482 | /* if we are shutdown, then don't add to the watcher set */ |
| 483 | if (fd->shutdown) { |
| 484 | watcher->fd = NULL; |
| 485 | watcher->pollset = NULL; |
| 486 | watcher->worker = NULL; |
| 487 | gpr_mu_unlock(&fd->mu); |
| 488 | GRPC_FD_UNREF(fd, "poll"); |
| 489 | return 0; |
| 490 | } |
| 491 | |
| 492 | /* if there is nobody polling for read, but we need to, then start doing so */ |
| 493 | cur = fd->read_closure; |
| 494 | requested = cur != CLOSURE_READY; |
| 495 | if (read_mask && fd->read_watcher == NULL && requested) { |
| 496 | fd->read_watcher = watcher; |
| 497 | mask |= read_mask; |
| 498 | } |
| 499 | /* if there is nobody polling for write, but we need to, then start doing so |
| 500 | */ |
| 501 | cur = fd->write_closure; |
| 502 | requested = cur != CLOSURE_READY; |
| 503 | if (write_mask && fd->write_watcher == NULL && requested) { |
| 504 | fd->write_watcher = watcher; |
| 505 | mask |= write_mask; |
| 506 | } |
| 507 | /* if not polling, remember this watcher in case we need someone to later */ |
| 508 | if (mask == 0 && worker != NULL) { |
| 509 | watcher->next = &fd->inactive_watcher_root; |
| 510 | watcher->prev = watcher->next->prev; |
| 511 | watcher->next->prev = watcher->prev->next = watcher; |
| 512 | } |
| 513 | watcher->pollset = pollset; |
| 514 | watcher->worker = worker; |
| 515 | watcher->fd = fd; |
| 516 | gpr_mu_unlock(&fd->mu); |
| 517 | |
| 518 | return mask; |
| 519 | } |
| 520 | |
| 521 | static void fd_end_poll(grpc_exec_ctx *exec_ctx, grpc_fd_watcher *watcher, |
| 522 | int got_read, int got_write) { |
| 523 | int was_polling = 0; |
| 524 | int kick = 0; |
| 525 | grpc_fd *fd = watcher->fd; |
| 526 | |
| 527 | if (fd == NULL) { |
| 528 | return; |
| 529 | } |
| 530 | |
| 531 | gpr_mu_lock(&fd->mu); |
| 532 | |
| 533 | if (watcher == fd->read_watcher) { |
| 534 | /* remove read watcher, kick if we still need a read */ |
| 535 | was_polling = 1; |
| 536 | if (!got_read) { |
| 537 | kick = 1; |
| 538 | } |
| 539 | fd->read_watcher = NULL; |
| 540 | } |
| 541 | if (watcher == fd->write_watcher) { |
| 542 | /* remove write watcher, kick if we still need a write */ |
| 543 | was_polling = 1; |
| 544 | if (!got_write) { |
| 545 | kick = 1; |
| 546 | } |
| 547 | fd->write_watcher = NULL; |
| 548 | } |
| 549 | if (!was_polling && watcher->worker != NULL) { |
| 550 | /* remove from inactive list */ |
| 551 | watcher->next->prev = watcher->prev; |
| 552 | watcher->prev->next = watcher->next; |
| 553 | } |
| 554 | if (got_read) { |
| 555 | if (set_ready_locked(exec_ctx, fd, &fd->read_closure)) { |
| 556 | kick = 1; |
| 557 | } |
| 558 | } |
| 559 | if (got_write) { |
| 560 | if (set_ready_locked(exec_ctx, fd, &fd->write_closure)) { |
| 561 | kick = 1; |
| 562 | } |
| 563 | } |
| 564 | if (kick) { |
| 565 | maybe_wake_one_watcher_locked(fd); |
| 566 | } |
| 567 | if (fd_is_orphaned(fd) && !has_watchers(fd) && !fd->closed) { |
| 568 | close_fd_locked(exec_ctx, fd); |
| 569 | } |
| 570 | gpr_mu_unlock(&fd->mu); |
| 571 | |
| 572 | GRPC_FD_UNREF(fd, "poll"); |
| 573 | } |
| 574 | |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 575 | /******************************************************************************* |
| 576 | * pollset_posix.c |
| 577 | */ |
| 578 | |
| 579 | GPR_TLS_DECL(g_current_thread_poller); |
| 580 | GPR_TLS_DECL(g_current_thread_worker); |
| 581 | |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 582 | static void remove_worker(grpc_pollset *p, grpc_pollset_worker *worker) { |
| 583 | worker->prev->next = worker->next; |
| 584 | worker->next->prev = worker->prev; |
| 585 | } |
| 586 | |
| 587 | static int pollset_has_workers(grpc_pollset *p) { |
| 588 | return p->root_worker.next != &p->root_worker; |
| 589 | } |
| 590 | |
| 591 | static grpc_pollset_worker *pop_front_worker(grpc_pollset *p) { |
| 592 | if (pollset_has_workers(p)) { |
| 593 | grpc_pollset_worker *w = p->root_worker.next; |
| 594 | remove_worker(p, w); |
| 595 | return w; |
| 596 | } else { |
| 597 | return NULL; |
| 598 | } |
| 599 | } |
| 600 | |
| 601 | static void push_back_worker(grpc_pollset *p, grpc_pollset_worker *worker) { |
| 602 | worker->next = &p->root_worker; |
| 603 | worker->prev = worker->next->prev; |
| 604 | worker->prev->next = worker->next->prev = worker; |
| 605 | } |
| 606 | |
| 607 | static void push_front_worker(grpc_pollset *p, grpc_pollset_worker *worker) { |
| 608 | worker->prev = &p->root_worker; |
| 609 | worker->next = worker->prev->next; |
| 610 | worker->prev->next = worker->next->prev = worker; |
| 611 | } |
| 612 | |
| 613 | static void pollset_kick_ext(grpc_pollset *p, |
| 614 | grpc_pollset_worker *specific_worker, |
| 615 | uint32_t flags) { |
| 616 | GPR_TIMER_BEGIN("pollset_kick_ext", 0); |
| 617 | |
| 618 | /* pollset->mu already held */ |
| 619 | if (specific_worker != NULL) { |
| 620 | if (specific_worker == GRPC_POLLSET_KICK_BROADCAST) { |
| 621 | GPR_TIMER_BEGIN("pollset_kick_ext.broadcast", 0); |
| 622 | GPR_ASSERT((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) == 0); |
| 623 | for (specific_worker = p->root_worker.next; |
| 624 | specific_worker != &p->root_worker; |
| 625 | specific_worker = specific_worker->next) { |
| 626 | grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd); |
| 627 | } |
| 628 | p->kicked_without_pollers = 1; |
| 629 | GPR_TIMER_END("pollset_kick_ext.broadcast", 0); |
| 630 | } else if (gpr_tls_get(&g_current_thread_worker) != |
| 631 | (intptr_t)specific_worker) { |
| 632 | GPR_TIMER_MARK("different_thread_worker", 0); |
| 633 | if ((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) != 0) { |
| 634 | specific_worker->reevaluate_polling_on_wakeup = 1; |
| 635 | } |
| 636 | specific_worker->kicked_specifically = 1; |
| 637 | grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd); |
| 638 | } else if ((flags & GRPC_POLLSET_CAN_KICK_SELF) != 0) { |
| 639 | GPR_TIMER_MARK("kick_yoself", 0); |
| 640 | if ((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) != 0) { |
| 641 | specific_worker->reevaluate_polling_on_wakeup = 1; |
| 642 | } |
| 643 | specific_worker->kicked_specifically = 1; |
| 644 | grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd); |
| 645 | } |
| 646 | } else if (gpr_tls_get(&g_current_thread_poller) != (intptr_t)p) { |
| 647 | GPR_ASSERT((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) == 0); |
| 648 | GPR_TIMER_MARK("kick_anonymous", 0); |
| 649 | specific_worker = pop_front_worker(p); |
| 650 | if (specific_worker != NULL) { |
| 651 | if (gpr_tls_get(&g_current_thread_worker) == (intptr_t)specific_worker) { |
| 652 | GPR_TIMER_MARK("kick_anonymous_not_self", 0); |
| 653 | push_back_worker(p, specific_worker); |
| 654 | specific_worker = pop_front_worker(p); |
| 655 | if ((flags & GRPC_POLLSET_CAN_KICK_SELF) == 0 && |
| 656 | gpr_tls_get(&g_current_thread_worker) == |
| 657 | (intptr_t)specific_worker) { |
| 658 | push_back_worker(p, specific_worker); |
| 659 | specific_worker = NULL; |
| 660 | } |
| 661 | } |
| 662 | if (specific_worker != NULL) { |
| 663 | GPR_TIMER_MARK("finally_kick", 0); |
| 664 | push_back_worker(p, specific_worker); |
| 665 | grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd); |
| 666 | } |
| 667 | } else { |
| 668 | GPR_TIMER_MARK("kicked_no_pollers", 0); |
| 669 | p->kicked_without_pollers = 1; |
| 670 | } |
| 671 | } |
| 672 | |
| 673 | GPR_TIMER_END("pollset_kick_ext", 0); |
| 674 | } |
| 675 | |
| 676 | static void pollset_kick(grpc_pollset *p, |
| 677 | grpc_pollset_worker *specific_worker) { |
| 678 | pollset_kick_ext(p, specific_worker, 0); |
| 679 | } |
| 680 | |
| 681 | /* global state management */ |
| 682 | |
| 683 | static void pollset_global_init(void) { |
| 684 | gpr_tls_init(&g_current_thread_poller); |
| 685 | gpr_tls_init(&g_current_thread_worker); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 686 | grpc_wakeup_fd_init(&grpc_global_wakeup_fd); |
| 687 | } |
| 688 | |
| 689 | static void pollset_global_shutdown(void) { |
| 690 | grpc_wakeup_fd_destroy(&grpc_global_wakeup_fd); |
| 691 | gpr_tls_destroy(&g_current_thread_poller); |
| 692 | gpr_tls_destroy(&g_current_thread_worker); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 693 | } |
| 694 | |
| 695 | static void kick_poller(void) { grpc_wakeup_fd_wakeup(&grpc_global_wakeup_fd); } |
| 696 | |
| 697 | /* main interface */ |
| 698 | |
Craig Tiller | ac04b7f | 2016-02-26 08:36:44 -0800 | [diff] [blame] | 699 | static void pollset_init(grpc_pollset *pollset, gpr_mu **mu) { |
| 700 | gpr_mu_init(&pollset->mu); |
| 701 | *mu = &pollset->mu; |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 702 | pollset->root_worker.next = pollset->root_worker.prev = &pollset->root_worker; |
| 703 | pollset->in_flight_cbs = 0; |
| 704 | pollset->shutting_down = 0; |
| 705 | pollset->called_shutdown = 0; |
| 706 | pollset->kicked_without_pollers = 0; |
| 707 | pollset->idle_jobs.head = pollset->idle_jobs.tail = NULL; |
| 708 | pollset->local_wakeup_cache = NULL; |
| 709 | pollset->kicked_without_pollers = 0; |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 710 | pollset->fd_count = 0; |
Craig Tiller | b38197e | 2016-02-26 10:14:54 -0800 | [diff] [blame] | 711 | pollset->fd_capacity = 0; |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 712 | pollset->del_count = 0; |
Craig Tiller | b38197e | 2016-02-26 10:14:54 -0800 | [diff] [blame] | 713 | pollset->del_capacity = 0; |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 714 | pollset->fds = NULL; |
| 715 | pollset->dels = NULL; |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 716 | } |
| 717 | |
| 718 | static void pollset_destroy(grpc_pollset *pollset) { |
| 719 | GPR_ASSERT(pollset->in_flight_cbs == 0); |
| 720 | GPR_ASSERT(!pollset_has_workers(pollset)); |
| 721 | GPR_ASSERT(pollset->idle_jobs.head == pollset->idle_jobs.tail); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 722 | while (pollset->local_wakeup_cache) { |
| 723 | grpc_cached_wakeup_fd *next = pollset->local_wakeup_cache->next; |
| 724 | grpc_wakeup_fd_destroy(&pollset->local_wakeup_cache->fd); |
| 725 | gpr_free(pollset->local_wakeup_cache); |
| 726 | pollset->local_wakeup_cache = next; |
| 727 | } |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 728 | gpr_free(pollset->fds); |
| 729 | gpr_free(pollset->dels); |
Craig Tiller | ac04b7f | 2016-02-26 08:36:44 -0800 | [diff] [blame] | 730 | gpr_mu_destroy(&pollset->mu); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 731 | } |
| 732 | |
| 733 | static void pollset_reset(grpc_pollset *pollset) { |
| 734 | GPR_ASSERT(pollset->shutting_down); |
| 735 | GPR_ASSERT(pollset->in_flight_cbs == 0); |
| 736 | GPR_ASSERT(!pollset_has_workers(pollset)); |
| 737 | GPR_ASSERT(pollset->idle_jobs.head == pollset->idle_jobs.tail); |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 738 | GPR_ASSERT(pollset->fd_count == 0); |
| 739 | GPR_ASSERT(pollset->del_count == 0); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 740 | pollset->shutting_down = 0; |
| 741 | pollset->called_shutdown = 0; |
| 742 | pollset->kicked_without_pollers = 0; |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 743 | } |
| 744 | |
| 745 | static void pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 746 | grpc_fd *fd) { |
Craig Tiller | ac04b7f | 2016-02-26 08:36:44 -0800 | [diff] [blame] | 747 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 748 | size_t i; |
| 749 | /* TODO(ctiller): this is O(num_fds^2); maybe switch to a hash set here */ |
| 750 | for (i = 0; i < pollset->fd_count; i++) { |
| 751 | if (pollset->fds[i] == fd) goto exit; |
| 752 | } |
| 753 | if (pollset->fd_count == pollset->fd_capacity) { |
| 754 | pollset->fd_capacity = |
| 755 | GPR_MAX(pollset->fd_capacity + 8, pollset->fd_count * 3 / 2); |
| 756 | pollset->fds = |
| 757 | gpr_realloc(pollset->fds, sizeof(grpc_fd *) * pollset->fd_capacity); |
| 758 | } |
| 759 | pollset->fds[pollset->fd_count++] = fd; |
| 760 | GRPC_FD_REF(fd, "multipoller"); |
Craig Tiller | 4c2218e | 2016-05-11 10:27:08 -0700 | [diff] [blame] | 761 | pollset_kick(pollset, NULL); |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 762 | exit: |
Craig Tiller | ac04b7f | 2016-02-26 08:36:44 -0800 | [diff] [blame] | 763 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 764 | } |
| 765 | |
| 766 | static void finish_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset) { |
| 767 | GPR_ASSERT(grpc_closure_list_empty(pollset->idle_jobs)); |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 768 | size_t i; |
| 769 | for (i = 0; i < pollset->fd_count; i++) { |
| 770 | GRPC_FD_UNREF(pollset->fds[i], "multipoller"); |
| 771 | } |
| 772 | for (i = 0; i < pollset->del_count; i++) { |
| 773 | GRPC_FD_UNREF(pollset->dels[i], "multipoller_del"); |
| 774 | } |
| 775 | pollset->fd_count = 0; |
| 776 | pollset->del_count = 0; |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 777 | grpc_exec_ctx_enqueue(exec_ctx, pollset->shutdown_done, true, NULL); |
| 778 | } |
| 779 | |
| 780 | static void pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 781 | grpc_pollset_worker **worker_hdl, gpr_timespec now, |
| 782 | gpr_timespec deadline) { |
| 783 | grpc_pollset_worker worker; |
| 784 | *worker_hdl = &worker; |
| 785 | |
| 786 | /* pollset->mu already held */ |
| 787 | int added_worker = 0; |
| 788 | int locked = 1; |
| 789 | int queued_work = 0; |
| 790 | int keep_polling = 0; |
| 791 | GPR_TIMER_BEGIN("pollset_work", 0); |
| 792 | /* this must happen before we (potentially) drop pollset->mu */ |
| 793 | worker.next = worker.prev = NULL; |
| 794 | worker.reevaluate_polling_on_wakeup = 0; |
| 795 | if (pollset->local_wakeup_cache != NULL) { |
| 796 | worker.wakeup_fd = pollset->local_wakeup_cache; |
| 797 | pollset->local_wakeup_cache = worker.wakeup_fd->next; |
| 798 | } else { |
| 799 | worker.wakeup_fd = gpr_malloc(sizeof(*worker.wakeup_fd)); |
| 800 | grpc_wakeup_fd_init(&worker.wakeup_fd->fd); |
| 801 | } |
| 802 | worker.kicked_specifically = 0; |
| 803 | /* If there's work waiting for the pollset to be idle, and the |
| 804 | pollset is idle, then do that work */ |
| 805 | if (!pollset_has_workers(pollset) && |
| 806 | !grpc_closure_list_empty(pollset->idle_jobs)) { |
| 807 | GPR_TIMER_MARK("pollset_work.idle_jobs", 0); |
| 808 | grpc_exec_ctx_enqueue_list(exec_ctx, &pollset->idle_jobs, NULL); |
| 809 | goto done; |
| 810 | } |
| 811 | /* If we're shutting down then we don't execute any extended work */ |
| 812 | if (pollset->shutting_down) { |
| 813 | GPR_TIMER_MARK("pollset_work.shutting_down", 0); |
| 814 | goto done; |
| 815 | } |
| 816 | /* Give do_promote priority so we don't starve it out */ |
| 817 | if (pollset->in_flight_cbs) { |
| 818 | GPR_TIMER_MARK("pollset_work.in_flight_cbs", 0); |
Craig Tiller | ac04b7f | 2016-02-26 08:36:44 -0800 | [diff] [blame] | 819 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 820 | locked = 0; |
| 821 | goto done; |
| 822 | } |
| 823 | /* Start polling, and keep doing so while we're being asked to |
| 824 | re-evaluate our pollers (this allows poll() based pollers to |
| 825 | ensure they don't miss wakeups) */ |
| 826 | keep_polling = 1; |
Craig Tiller | 556e5ae | 2016-05-16 11:00:33 -0700 | [diff] [blame^] | 827 | gpr_tls_set(&g_current_thread_poller, (intptr_t)pollset); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 828 | while (keep_polling) { |
| 829 | keep_polling = 0; |
| 830 | if (!pollset->kicked_without_pollers) { |
| 831 | if (!added_worker) { |
| 832 | push_front_worker(pollset, &worker); |
| 833 | added_worker = 1; |
| 834 | gpr_tls_set(&g_current_thread_worker, (intptr_t)&worker); |
| 835 | } |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 836 | GPR_TIMER_BEGIN("maybe_work_and_unlock", 0); |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 837 | #define POLLOUT_CHECK (POLLOUT | POLLHUP | POLLERR) |
| 838 | #define POLLIN_CHECK (POLLIN | POLLHUP | POLLERR) |
| 839 | |
| 840 | int timeout; |
| 841 | int r; |
| 842 | size_t i, j, fd_count; |
| 843 | nfds_t pfd_count; |
| 844 | /* TODO(ctiller): inline some elements to avoid an allocation */ |
| 845 | grpc_fd_watcher *watchers; |
| 846 | struct pollfd *pfds; |
| 847 | |
| 848 | timeout = poll_deadline_to_millis_timeout(deadline, now); |
| 849 | /* TODO(ctiller): perform just one malloc here if we exceed the inline |
| 850 | * case */ |
| 851 | pfds = gpr_malloc(sizeof(*pfds) * (pollset->fd_count + 2)); |
| 852 | watchers = gpr_malloc(sizeof(*watchers) * (pollset->fd_count + 2)); |
| 853 | fd_count = 0; |
| 854 | pfd_count = 2; |
| 855 | pfds[0].fd = GRPC_WAKEUP_FD_GET_READ_FD(&grpc_global_wakeup_fd); |
| 856 | pfds[0].events = POLLIN; |
| 857 | pfds[0].revents = 0; |
| 858 | pfds[1].fd = GRPC_WAKEUP_FD_GET_READ_FD(&worker.wakeup_fd->fd); |
| 859 | pfds[1].events = POLLIN; |
| 860 | pfds[1].revents = 0; |
| 861 | for (i = 0; i < pollset->fd_count; i++) { |
| 862 | int remove = fd_is_orphaned(pollset->fds[i]); |
| 863 | for (j = 0; !remove && j < pollset->del_count; j++) { |
| 864 | if (pollset->fds[i] == pollset->dels[j]) remove = 1; |
| 865 | } |
| 866 | if (remove) { |
| 867 | GRPC_FD_UNREF(pollset->fds[i], "multipoller"); |
| 868 | } else { |
| 869 | pollset->fds[fd_count++] = pollset->fds[i]; |
| 870 | watchers[pfd_count].fd = pollset->fds[i]; |
Craig Tiller | 2fad50d | 2016-03-08 07:52:42 -0800 | [diff] [blame] | 871 | GRPC_FD_REF(watchers[pfd_count].fd, "multipoller_start"); |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 872 | pfds[pfd_count].fd = pollset->fds[i]->fd; |
| 873 | pfds[pfd_count].revents = 0; |
| 874 | pfd_count++; |
| 875 | } |
| 876 | } |
| 877 | for (j = 0; j < pollset->del_count; j++) { |
| 878 | GRPC_FD_UNREF(pollset->dels[j], "multipoller_del"); |
| 879 | } |
| 880 | pollset->del_count = 0; |
| 881 | pollset->fd_count = fd_count; |
Craig Tiller | ac04b7f | 2016-02-26 08:36:44 -0800 | [diff] [blame] | 882 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 883 | |
| 884 | for (i = 2; i < pfd_count; i++) { |
Craig Tiller | 2fad50d | 2016-03-08 07:52:42 -0800 | [diff] [blame] | 885 | grpc_fd *fd = watchers[i].fd; |
| 886 | pfds[i].events = (short)fd_begin_poll(fd, pollset, &worker, POLLIN, |
Craig Tiller | d9a60bb | 2016-03-28 23:13:19 -0700 | [diff] [blame] | 887 | POLLOUT, &watchers[i]); |
Craig Tiller | 2fad50d | 2016-03-08 07:52:42 -0800 | [diff] [blame] | 888 | GRPC_FD_UNREF(fd, "multipoller_start"); |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 889 | } |
| 890 | |
| 891 | /* TODO(vpai): Consider first doing a 0 timeout poll here to avoid |
| 892 | even going into the blocking annotation if possible */ |
| 893 | GRPC_SCHEDULING_START_BLOCKING_REGION; |
| 894 | r = grpc_poll_function(pfds, pfd_count, timeout); |
| 895 | GRPC_SCHEDULING_END_BLOCKING_REGION; |
| 896 | |
| 897 | if (r < 0) { |
| 898 | if (errno != EINTR) { |
| 899 | gpr_log(GPR_ERROR, "poll() failed: %s", strerror(errno)); |
| 900 | } |
| 901 | for (i = 2; i < pfd_count; i++) { |
| 902 | fd_end_poll(exec_ctx, &watchers[i], 0, 0); |
| 903 | } |
| 904 | } else if (r == 0) { |
| 905 | for (i = 2; i < pfd_count; i++) { |
| 906 | fd_end_poll(exec_ctx, &watchers[i], 0, 0); |
| 907 | } |
| 908 | } else { |
| 909 | if (pfds[0].revents & POLLIN_CHECK) { |
| 910 | grpc_wakeup_fd_consume_wakeup(&grpc_global_wakeup_fd); |
| 911 | } |
| 912 | if (pfds[1].revents & POLLIN_CHECK) { |
| 913 | grpc_wakeup_fd_consume_wakeup(&worker.wakeup_fd->fd); |
| 914 | } |
| 915 | for (i = 2; i < pfd_count; i++) { |
| 916 | if (watchers[i].fd == NULL) { |
| 917 | fd_end_poll(exec_ctx, &watchers[i], 0, 0); |
Craig Tiller | 9d86120 | 2016-05-11 10:12:57 -0700 | [diff] [blame] | 918 | } else { |
| 919 | fd_end_poll(exec_ctx, &watchers[i], pfds[i].revents & POLLIN_CHECK, |
| 920 | pfds[i].revents & POLLOUT_CHECK); |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 921 | } |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 922 | } |
| 923 | } |
| 924 | |
| 925 | gpr_free(pfds); |
| 926 | gpr_free(watchers); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 927 | GPR_TIMER_END("maybe_work_and_unlock", 0); |
| 928 | locked = 0; |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 929 | } else { |
| 930 | GPR_TIMER_MARK("pollset_work.kicked_without_pollers", 0); |
| 931 | pollset->kicked_without_pollers = 0; |
| 932 | } |
| 933 | /* Finished execution - start cleaning up. |
| 934 | Note that we may arrive here from outside the enclosing while() loop. |
| 935 | In that case we won't loop though as we haven't added worker to the |
| 936 | worker list, which means nobody could ask us to re-evaluate polling). */ |
| 937 | done: |
| 938 | if (!locked) { |
| 939 | queued_work |= grpc_exec_ctx_flush(exec_ctx); |
Craig Tiller | ac04b7f | 2016-02-26 08:36:44 -0800 | [diff] [blame] | 940 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 941 | locked = 1; |
| 942 | } |
| 943 | /* If we're forced to re-evaluate polling (via pollset_kick with |
| 944 | GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) then we land here and force |
| 945 | a loop */ |
| 946 | if (worker.reevaluate_polling_on_wakeup) { |
| 947 | worker.reevaluate_polling_on_wakeup = 0; |
| 948 | pollset->kicked_without_pollers = 0; |
| 949 | if (queued_work || worker.kicked_specifically) { |
| 950 | /* If there's queued work on the list, then set the deadline to be |
| 951 | immediate so we get back out of the polling loop quickly */ |
| 952 | deadline = gpr_inf_past(GPR_CLOCK_MONOTONIC); |
| 953 | } |
| 954 | keep_polling = 1; |
| 955 | } |
Craig Tiller | 9d86120 | 2016-05-11 10:12:57 -0700 | [diff] [blame] | 956 | if (keep_polling) { |
| 957 | now = gpr_now(now.clock_type); |
| 958 | } |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 959 | } |
Craig Tiller | 556e5ae | 2016-05-16 11:00:33 -0700 | [diff] [blame^] | 960 | gpr_tls_set(&g_current_thread_poller, 0); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 961 | if (added_worker) { |
| 962 | remove_worker(pollset, &worker); |
| 963 | gpr_tls_set(&g_current_thread_worker, 0); |
| 964 | } |
| 965 | /* release wakeup fd to the local pool */ |
| 966 | worker.wakeup_fd->next = pollset->local_wakeup_cache; |
| 967 | pollset->local_wakeup_cache = worker.wakeup_fd; |
| 968 | /* check shutdown conditions */ |
| 969 | if (pollset->shutting_down) { |
| 970 | if (pollset_has_workers(pollset)) { |
| 971 | pollset_kick(pollset, NULL); |
| 972 | } else if (!pollset->called_shutdown && pollset->in_flight_cbs == 0) { |
| 973 | pollset->called_shutdown = 1; |
Craig Tiller | ac04b7f | 2016-02-26 08:36:44 -0800 | [diff] [blame] | 974 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 975 | finish_shutdown(exec_ctx, pollset); |
| 976 | grpc_exec_ctx_flush(exec_ctx); |
| 977 | /* Continuing to access pollset here is safe -- it is the caller's |
| 978 | * responsibility to not destroy when it has outstanding calls to |
| 979 | * pollset_work. |
| 980 | * TODO(dklempner): Can we refactor the shutdown logic to avoid this? */ |
Craig Tiller | ac04b7f | 2016-02-26 08:36:44 -0800 | [diff] [blame] | 981 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 982 | } else if (!grpc_closure_list_empty(pollset->idle_jobs)) { |
| 983 | grpc_exec_ctx_enqueue_list(exec_ctx, &pollset->idle_jobs, NULL); |
Craig Tiller | ac04b7f | 2016-02-26 08:36:44 -0800 | [diff] [blame] | 984 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 985 | grpc_exec_ctx_flush(exec_ctx); |
Craig Tiller | ac04b7f | 2016-02-26 08:36:44 -0800 | [diff] [blame] | 986 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 987 | } |
| 988 | } |
| 989 | *worker_hdl = NULL; |
| 990 | GPR_TIMER_END("pollset_work", 0); |
| 991 | } |
| 992 | |
| 993 | static void pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 994 | grpc_closure *closure) { |
| 995 | GPR_ASSERT(!pollset->shutting_down); |
| 996 | pollset->shutting_down = 1; |
| 997 | pollset->shutdown_done = closure; |
| 998 | pollset_kick(pollset, GRPC_POLLSET_KICK_BROADCAST); |
| 999 | if (!pollset_has_workers(pollset)) { |
| 1000 | grpc_exec_ctx_enqueue_list(exec_ctx, &pollset->idle_jobs, NULL); |
| 1001 | } |
| 1002 | if (!pollset->called_shutdown && pollset->in_flight_cbs == 0 && |
| 1003 | !pollset_has_workers(pollset)) { |
| 1004 | pollset->called_shutdown = 1; |
| 1005 | finish_shutdown(exec_ctx, pollset); |
| 1006 | } |
| 1007 | } |
| 1008 | |
| 1009 | static int poll_deadline_to_millis_timeout(gpr_timespec deadline, |
| 1010 | gpr_timespec now) { |
| 1011 | gpr_timespec timeout; |
| 1012 | static const int64_t max_spin_polling_us = 10; |
| 1013 | if (gpr_time_cmp(deadline, gpr_inf_future(deadline.clock_type)) == 0) { |
| 1014 | return -1; |
| 1015 | } |
| 1016 | if (gpr_time_cmp(deadline, gpr_time_add(now, gpr_time_from_micros( |
| 1017 | max_spin_polling_us, |
| 1018 | GPR_TIMESPAN))) <= 0) { |
| 1019 | return 0; |
| 1020 | } |
| 1021 | timeout = gpr_time_sub(deadline, now); |
| 1022 | return gpr_time_to_millis(gpr_time_add( |
| 1023 | timeout, gpr_time_from_nanos(GPR_NS_PER_MS - 1, GPR_TIMESPAN))); |
| 1024 | } |
| 1025 | |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 1026 | /******************************************************************************* |
| 1027 | * pollset_set_posix.c |
| 1028 | */ |
| 1029 | |
| 1030 | static grpc_pollset_set *pollset_set_create(void) { |
| 1031 | grpc_pollset_set *pollset_set = gpr_malloc(sizeof(*pollset_set)); |
| 1032 | memset(pollset_set, 0, sizeof(*pollset_set)); |
| 1033 | gpr_mu_init(&pollset_set->mu); |
| 1034 | return pollset_set; |
| 1035 | } |
| 1036 | |
| 1037 | static void pollset_set_destroy(grpc_pollset_set *pollset_set) { |
| 1038 | size_t i; |
| 1039 | gpr_mu_destroy(&pollset_set->mu); |
| 1040 | for (i = 0; i < pollset_set->fd_count; i++) { |
| 1041 | GRPC_FD_UNREF(pollset_set->fds[i], "pollset_set"); |
| 1042 | } |
| 1043 | gpr_free(pollset_set->pollsets); |
| 1044 | gpr_free(pollset_set->pollset_sets); |
| 1045 | gpr_free(pollset_set->fds); |
| 1046 | gpr_free(pollset_set); |
| 1047 | } |
| 1048 | |
| 1049 | static void pollset_set_add_pollset(grpc_exec_ctx *exec_ctx, |
| 1050 | grpc_pollset_set *pollset_set, |
| 1051 | grpc_pollset *pollset) { |
| 1052 | size_t i, j; |
| 1053 | gpr_mu_lock(&pollset_set->mu); |
| 1054 | if (pollset_set->pollset_count == pollset_set->pollset_capacity) { |
| 1055 | pollset_set->pollset_capacity = |
| 1056 | GPR_MAX(8, 2 * pollset_set->pollset_capacity); |
| 1057 | pollset_set->pollsets = |
| 1058 | gpr_realloc(pollset_set->pollsets, pollset_set->pollset_capacity * |
| 1059 | sizeof(*pollset_set->pollsets)); |
| 1060 | } |
| 1061 | pollset_set->pollsets[pollset_set->pollset_count++] = pollset; |
| 1062 | for (i = 0, j = 0; i < pollset_set->fd_count; i++) { |
| 1063 | if (fd_is_orphaned(pollset_set->fds[i])) { |
| 1064 | GRPC_FD_UNREF(pollset_set->fds[i], "pollset_set"); |
| 1065 | } else { |
| 1066 | pollset_add_fd(exec_ctx, pollset, pollset_set->fds[i]); |
| 1067 | pollset_set->fds[j++] = pollset_set->fds[i]; |
| 1068 | } |
| 1069 | } |
| 1070 | pollset_set->fd_count = j; |
| 1071 | gpr_mu_unlock(&pollset_set->mu); |
| 1072 | } |
| 1073 | |
| 1074 | static void pollset_set_del_pollset(grpc_exec_ctx *exec_ctx, |
| 1075 | grpc_pollset_set *pollset_set, |
| 1076 | grpc_pollset *pollset) { |
| 1077 | size_t i; |
| 1078 | gpr_mu_lock(&pollset_set->mu); |
| 1079 | for (i = 0; i < pollset_set->pollset_count; i++) { |
| 1080 | if (pollset_set->pollsets[i] == pollset) { |
| 1081 | pollset_set->pollset_count--; |
| 1082 | GPR_SWAP(grpc_pollset *, pollset_set->pollsets[i], |
| 1083 | pollset_set->pollsets[pollset_set->pollset_count]); |
| 1084 | break; |
| 1085 | } |
| 1086 | } |
| 1087 | gpr_mu_unlock(&pollset_set->mu); |
| 1088 | } |
| 1089 | |
| 1090 | static void pollset_set_add_pollset_set(grpc_exec_ctx *exec_ctx, |
| 1091 | grpc_pollset_set *bag, |
| 1092 | grpc_pollset_set *item) { |
| 1093 | size_t i, j; |
| 1094 | gpr_mu_lock(&bag->mu); |
| 1095 | if (bag->pollset_set_count == bag->pollset_set_capacity) { |
| 1096 | bag->pollset_set_capacity = GPR_MAX(8, 2 * bag->pollset_set_capacity); |
| 1097 | bag->pollset_sets = |
| 1098 | gpr_realloc(bag->pollset_sets, |
| 1099 | bag->pollset_set_capacity * sizeof(*bag->pollset_sets)); |
| 1100 | } |
| 1101 | bag->pollset_sets[bag->pollset_set_count++] = item; |
| 1102 | for (i = 0, j = 0; i < bag->fd_count; i++) { |
| 1103 | if (fd_is_orphaned(bag->fds[i])) { |
| 1104 | GRPC_FD_UNREF(bag->fds[i], "pollset_set"); |
| 1105 | } else { |
| 1106 | pollset_set_add_fd(exec_ctx, item, bag->fds[i]); |
| 1107 | bag->fds[j++] = bag->fds[i]; |
| 1108 | } |
| 1109 | } |
| 1110 | bag->fd_count = j; |
| 1111 | gpr_mu_unlock(&bag->mu); |
| 1112 | } |
| 1113 | |
| 1114 | static void pollset_set_del_pollset_set(grpc_exec_ctx *exec_ctx, |
| 1115 | grpc_pollset_set *bag, |
| 1116 | grpc_pollset_set *item) { |
| 1117 | size_t i; |
| 1118 | gpr_mu_lock(&bag->mu); |
| 1119 | for (i = 0; i < bag->pollset_set_count; i++) { |
| 1120 | if (bag->pollset_sets[i] == item) { |
| 1121 | bag->pollset_set_count--; |
| 1122 | GPR_SWAP(grpc_pollset_set *, bag->pollset_sets[i], |
| 1123 | bag->pollset_sets[bag->pollset_set_count]); |
| 1124 | break; |
| 1125 | } |
| 1126 | } |
| 1127 | gpr_mu_unlock(&bag->mu); |
| 1128 | } |
| 1129 | |
| 1130 | static void pollset_set_add_fd(grpc_exec_ctx *exec_ctx, |
| 1131 | grpc_pollset_set *pollset_set, grpc_fd *fd) { |
| 1132 | size_t i; |
| 1133 | gpr_mu_lock(&pollset_set->mu); |
| 1134 | if (pollset_set->fd_count == pollset_set->fd_capacity) { |
| 1135 | pollset_set->fd_capacity = GPR_MAX(8, 2 * pollset_set->fd_capacity); |
| 1136 | pollset_set->fds = gpr_realloc( |
| 1137 | pollset_set->fds, pollset_set->fd_capacity * sizeof(*pollset_set->fds)); |
| 1138 | } |
| 1139 | GRPC_FD_REF(fd, "pollset_set"); |
| 1140 | pollset_set->fds[pollset_set->fd_count++] = fd; |
| 1141 | for (i = 0; i < pollset_set->pollset_count; i++) { |
| 1142 | pollset_add_fd(exec_ctx, pollset_set->pollsets[i], fd); |
| 1143 | } |
| 1144 | for (i = 0; i < pollset_set->pollset_set_count; i++) { |
| 1145 | pollset_set_add_fd(exec_ctx, pollset_set->pollset_sets[i], fd); |
| 1146 | } |
| 1147 | gpr_mu_unlock(&pollset_set->mu); |
| 1148 | } |
| 1149 | |
| 1150 | static void pollset_set_del_fd(grpc_exec_ctx *exec_ctx, |
| 1151 | grpc_pollset_set *pollset_set, grpc_fd *fd) { |
| 1152 | size_t i; |
| 1153 | gpr_mu_lock(&pollset_set->mu); |
| 1154 | for (i = 0; i < pollset_set->fd_count; i++) { |
| 1155 | if (pollset_set->fds[i] == fd) { |
| 1156 | pollset_set->fd_count--; |
| 1157 | GPR_SWAP(grpc_fd *, pollset_set->fds[i], |
| 1158 | pollset_set->fds[pollset_set->fd_count]); |
| 1159 | GRPC_FD_UNREF(fd, "pollset_set"); |
| 1160 | break; |
| 1161 | } |
| 1162 | } |
| 1163 | for (i = 0; i < pollset_set->pollset_set_count; i++) { |
| 1164 | pollset_set_del_fd(exec_ctx, pollset_set->pollset_sets[i], fd); |
| 1165 | } |
| 1166 | gpr_mu_unlock(&pollset_set->mu); |
| 1167 | } |
| 1168 | |
| 1169 | /******************************************************************************* |
| 1170 | * event engine binding |
| 1171 | */ |
| 1172 | |
Craig Tiller | 7ac6bf0 | 2016-02-25 12:54:59 -0800 | [diff] [blame] | 1173 | static void shutdown_engine(void) { pollset_global_shutdown(); } |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 1174 | |
| 1175 | static const grpc_event_engine_vtable vtable = { |
| 1176 | .pollset_size = sizeof(grpc_pollset), |
| 1177 | |
| 1178 | .fd_create = fd_create, |
| 1179 | .fd_wrapped_fd = fd_wrapped_fd, |
| 1180 | .fd_orphan = fd_orphan, |
| 1181 | .fd_shutdown = fd_shutdown, |
| 1182 | .fd_notify_on_read = fd_notify_on_read, |
| 1183 | .fd_notify_on_write = fd_notify_on_write, |
| 1184 | |
| 1185 | .pollset_init = pollset_init, |
| 1186 | .pollset_shutdown = pollset_shutdown, |
| 1187 | .pollset_reset = pollset_reset, |
| 1188 | .pollset_destroy = pollset_destroy, |
| 1189 | .pollset_work = pollset_work, |
| 1190 | .pollset_kick = pollset_kick, |
| 1191 | .pollset_add_fd = pollset_add_fd, |
| 1192 | |
| 1193 | .pollset_set_create = pollset_set_create, |
| 1194 | .pollset_set_destroy = pollset_set_destroy, |
| 1195 | .pollset_set_add_pollset = pollset_set_add_pollset, |
| 1196 | .pollset_set_del_pollset = pollset_set_del_pollset, |
| 1197 | .pollset_set_add_pollset_set = pollset_set_add_pollset_set, |
| 1198 | .pollset_set_del_pollset_set = pollset_set_del_pollset_set, |
| 1199 | .pollset_set_add_fd = pollset_set_add_fd, |
| 1200 | .pollset_set_del_fd = pollset_set_del_fd, |
| 1201 | |
| 1202 | .kick_poller = kick_poller, |
| 1203 | |
| 1204 | .shutdown_engine = shutdown_engine, |
| 1205 | }; |
| 1206 | |
| 1207 | const grpc_event_engine_vtable *grpc_init_poll_posix(void) { |
Craig Tiller | 253bd50 | 2016-02-25 12:30:23 -0800 | [diff] [blame] | 1208 | pollset_global_init(); |
| 1209 | return &vtable; |
| 1210 | } |
| 1211 | |
| 1212 | #endif |