Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 3 | * Copyright 2017 gRPC authors. |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 4 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 8 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 10 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 16 | * |
| 17 | */ |
| 18 | |
| 19 | #include "src/core/lib/iomgr/port.h" |
| 20 | |
| 21 | /* This polling engine is only relevant on linux kernels supporting epoll() */ |
| 22 | #ifdef GRPC_LINUX_EPOLL |
| 23 | |
Craig Tiller | c610985 | 2017-05-01 14:26:49 -0700 | [diff] [blame] | 24 | #include "src/core/lib/iomgr/ev_epollex_linux.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 25 | |
| 26 | #include <assert.h> |
| 27 | #include <errno.h> |
| 28 | #include <poll.h> |
| 29 | #include <pthread.h> |
| 30 | #include <string.h> |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 31 | #include <sys/socket.h> |
| 32 | #include <unistd.h> |
| 33 | |
| 34 | #include <grpc/support/alloc.h> |
| 35 | #include <grpc/support/log.h> |
| 36 | #include <grpc/support/string_util.h> |
| 37 | #include <grpc/support/tls.h> |
| 38 | #include <grpc/support/useful.h> |
| 39 | |
Craig Tiller | b4bb1cd | 2017-07-20 14:18:17 -0700 | [diff] [blame] | 40 | #include "src/core/lib/debug/stats.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 41 | #include "src/core/lib/iomgr/ev_posix.h" |
| 42 | #include "src/core/lib/iomgr/iomgr_internal.h" |
Craig Tiller | 819cd88 | 2017-04-25 13:18:22 -0700 | [diff] [blame] | 43 | #include "src/core/lib/iomgr/is_epollexclusive_available.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 44 | #include "src/core/lib/iomgr/lockfree_event.h" |
Craig Tiller | 819cd88 | 2017-04-25 13:18:22 -0700 | [diff] [blame] | 45 | #include "src/core/lib/iomgr/sys_epoll_wrapper.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 46 | #include "src/core/lib/iomgr/timer.h" |
| 47 | #include "src/core/lib/iomgr/wakeup_fd_posix.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 48 | #include "src/core/lib/profiling/timers.h" |
| 49 | #include "src/core/lib/support/block_annotate.h" |
Craig Tiller | 0b4c901 | 2017-04-06 17:19:37 -0700 | [diff] [blame] | 50 | #include "src/core/lib/support/spinlock.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 51 | |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 52 | // debug aid: create workers on the heap (allows asan to spot use-after-destruction) |
| 53 | #define GRPC_EPOLLEX_CREATE_WORKERS_ON_HEAP 1 |
| 54 | |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 55 | #ifndef NDEBUG |
| 56 | grpc_tracer_flag grpc_trace_pollable_refcount = |
| 57 | GRPC_TRACER_INITIALIZER(false, "pollable_refcount"); |
| 58 | #endif |
| 59 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 60 | /******************************************************************************* |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 61 | * pollable Declarations |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 62 | */ |
| 63 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 64 | typedef enum { PO_MULTI, PO_FD, PO_EMPTY } pollable_type; |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 65 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 66 | typedef struct pollable pollable; |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 67 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 68 | struct pollable { |
| 69 | pollable_type type; // immutable |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 70 | gpr_refcount refs; |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 71 | |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 72 | int epfd; |
| 73 | grpc_wakeup_fd wakeup; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 74 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 75 | // only for type fd... one ref to the owner fd |
| 76 | grpc_fd *owner_fd; |
| 77 | |
| 78 | grpc_pollset_set *pollset_set; |
| 79 | pollable *next; |
| 80 | pollable *prev; |
| 81 | |
| 82 | gpr_mu mu; |
| 83 | grpc_pollset_worker *root_worker; |
| 84 | }; |
| 85 | |
| 86 | static const char *pollable_type_string(pollable_type t) { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 87 | switch (t) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 88 | case PO_MULTI: |
Craig Tiller | 7fd8f67 | 2017-07-05 15:10:12 -0700 | [diff] [blame] | 89 | return "pollset"; |
| 90 | case PO_FD: |
| 91 | return "fd"; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 92 | case PO_EMPTY: |
| 93 | return "empty"; |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 94 | } |
| 95 | return "<invalid>"; |
| 96 | } |
| 97 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 98 | static char *pollable_desc(pollable *p) { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 99 | char *out; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 100 | gpr_asprintf(&out, "type=%s epfd=%d wakeup=%d", pollable_type_string(p->type), |
| 101 | p->epfd, p->wakeup.read_fd); |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 102 | return out; |
| 103 | } |
| 104 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 105 | static pollable *g_empty_pollable; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 106 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 107 | static grpc_error *pollable_create(pollable_type type, pollable **p); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 108 | #ifdef NDEBUG |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 109 | static pollable *pollable_ref(pollable *p); |
| 110 | static void pollable_unref(pollable *p); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 111 | #define POLLABLE_REF(p, r) pollable_ref(p) |
| 112 | #define POLLABLE_UNREF(p, r) pollable_unref(p) |
| 113 | #else |
| 114 | static pollable *pollable_ref(pollable *p, int line, const char *reason); |
| 115 | static void pollable_unref(pollable *p, int line, const char *reason); |
| 116 | #define POLLABLE_REF(p, r) pollable_ref((p), __LINE__, (r)) |
| 117 | #define POLLABLE_UNREF(p, r) pollable_unref((p), __LINE__, (r)) |
| 118 | #endif |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 119 | |
| 120 | /******************************************************************************* |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 121 | * Fd Declarations |
| 122 | */ |
| 123 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 124 | struct grpc_fd { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 125 | int fd; |
| 126 | /* refst format: |
| 127 | bit 0 : 1=Active / 0=Orphaned |
| 128 | bits 1-n : refcount |
| 129 | Ref/Unref by two to avoid altering the orphaned bit */ |
| 130 | gpr_atm refst; |
| 131 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 132 | gpr_mu pollable_mu; |
| 133 | pollable *pollable_obj; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 134 | |
| 135 | gpr_atm read_closure; |
| 136 | gpr_atm write_closure; |
| 137 | |
| 138 | struct grpc_fd *freelist_next; |
| 139 | grpc_closure *on_done_closure; |
| 140 | |
| 141 | /* The pollset that last noticed that the fd is readable. The actual type |
| 142 | * stored in this is (grpc_pollset *) */ |
| 143 | gpr_atm read_notifier_pollset; |
| 144 | |
| 145 | grpc_iomgr_object iomgr_object; |
| 146 | }; |
| 147 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 148 | static void fd_global_init(void); |
| 149 | static void fd_global_shutdown(void); |
| 150 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 151 | /******************************************************************************* |
| 152 | * Pollset Declarations |
| 153 | */ |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 154 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 155 | typedef struct { |
| 156 | grpc_pollset_worker *next; |
| 157 | grpc_pollset_worker *prev; |
| 158 | } pwlink; |
| 159 | |
| 160 | typedef enum { PWLINK_POLLABLE = 0, PWLINK_POLLSET, PWLINK_COUNT } pwlinks; |
| 161 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 162 | struct grpc_pollset_worker { |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 163 | bool kicked; |
| 164 | bool initialized_cv; |
| 165 | gpr_cv cv; |
Craig Tiller | 9f01251 | 2017-04-13 15:37:14 -0700 | [diff] [blame] | 166 | grpc_pollset *pollset; |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 167 | pollable *pollable_obj; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 168 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 169 | pwlink links[PWLINK_COUNT]; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 170 | }; |
| 171 | |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 172 | #define MAX_EPOLL_EVENTS 100 |
Craig Tiller | ca4fc66 | 2017-06-09 11:13:56 -0700 | [diff] [blame] | 173 | #define MAX_EPOLL_EVENTS_HANDLED_EACH_POLL_CALL 5 |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 174 | |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 175 | struct grpc_pollset { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 176 | gpr_mu mu; |
| 177 | pollable *active_pollable; |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 178 | bool kicked_without_poller; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 179 | grpc_closure *shutdown_closure; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 180 | grpc_pollset_worker *root_worker; |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 181 | |
| 182 | int event_cursor; |
| 183 | int event_count; |
| 184 | struct epoll_event events[MAX_EPOLL_EVENTS]; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 185 | }; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 186 | |
| 187 | /******************************************************************************* |
| 188 | * Pollset-set Declarations |
| 189 | */ |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 190 | |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 191 | struct grpc_pollset_set { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 192 | gpr_refcount refs; |
| 193 | gpr_mu mu; |
| 194 | grpc_pollset_set *parent; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 195 | |
| 196 | size_t pollset_count; |
| 197 | size_t pollset_capacity; |
| 198 | pollable **pollsets; |
| 199 | |
| 200 | size_t fd_count; |
| 201 | size_t fd_capacity; |
| 202 | grpc_fd **fds; |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 203 | }; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 204 | |
| 205 | /******************************************************************************* |
| 206 | * Common helpers |
| 207 | */ |
| 208 | |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 209 | static bool append_error(grpc_error **composite, grpc_error *error, |
| 210 | const char *desc) { |
| 211 | if (error == GRPC_ERROR_NONE) return true; |
| 212 | if (*composite == GRPC_ERROR_NONE) { |
| 213 | *composite = GRPC_ERROR_CREATE_FROM_COPIED_STRING(desc); |
| 214 | } |
| 215 | *composite = grpc_error_add_child(*composite, error); |
| 216 | return false; |
| 217 | } |
| 218 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 219 | /******************************************************************************* |
| 220 | * Fd Definitions |
| 221 | */ |
| 222 | |
| 223 | /* We need to keep a freelist not because of any concerns of malloc performance |
| 224 | * but instead so that implementations with multiple threads in (for example) |
| 225 | * epoll_wait deal with the race between pollset removal and incoming poll |
| 226 | * notifications. |
| 227 | * |
| 228 | * The problem is that the poller ultimately holds a reference to this |
| 229 | * object, so it is very difficult to know when is safe to free it, at least |
| 230 | * without some expensive synchronization. |
| 231 | * |
| 232 | * If we keep the object freelisted, in the worst case losing this race just |
| 233 | * becomes a spurious read notification on a reused fd. |
| 234 | */ |
| 235 | |
| 236 | /* The alarm system needs to be able to wakeup 'some poller' sometimes |
| 237 | * (specifically when a new alarm needs to be triggered earlier than the next |
| 238 | * alarm 'epoch'). This wakeup_fd gives us something to alert on when such a |
| 239 | * case occurs. */ |
| 240 | |
| 241 | static grpc_fd *fd_freelist = NULL; |
| 242 | static gpr_mu fd_freelist_mu; |
| 243 | |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 244 | #ifndef NDEBUG |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 245 | #define REF_BY(fd, n, reason) ref_by(fd, n, reason, __FILE__, __LINE__) |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 246 | #define UNREF_BY(ec, fd, n, reason) \ |
| 247 | unref_by(ec, fd, n, reason, __FILE__, __LINE__) |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 248 | static void ref_by(grpc_fd *fd, int n, const char *reason, const char *file, |
| 249 | int line) { |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 250 | if (GRPC_TRACER_ON(grpc_trace_fd_refcount)) { |
| 251 | gpr_log(GPR_DEBUG, |
| 252 | "FD %d %p ref %d %" PRIdPTR " -> %" PRIdPTR " [%s; %s:%d]", |
| 253 | fd->fd, fd, n, gpr_atm_no_barrier_load(&fd->refst), |
| 254 | gpr_atm_no_barrier_load(&fd->refst) + n, reason, file, line); |
| 255 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 256 | #else |
| 257 | #define REF_BY(fd, n, reason) ref_by(fd, n) |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 258 | #define UNREF_BY(ec, fd, n, reason) unref_by(ec, fd, n) |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 259 | static void ref_by(grpc_fd *fd, int n) { |
| 260 | #endif |
| 261 | GPR_ASSERT(gpr_atm_no_barrier_fetch_add(&fd->refst, n) > 0); |
| 262 | } |
| 263 | |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 264 | static void fd_destroy(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) { |
Yash Tibrewal | ca3c1c0 | 2017-09-07 22:47:16 -0700 | [diff] [blame] | 265 | grpc_fd *fd = (grpc_fd *)arg; |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 266 | /* Add the fd to the freelist */ |
| 267 | grpc_iomgr_unregister_object(&fd->iomgr_object); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 268 | POLLABLE_UNREF(fd->pollable_obj, "fd_pollable"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 269 | gpr_mu_destroy(&fd->pollable_mu); |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 270 | gpr_mu_lock(&fd_freelist_mu); |
| 271 | fd->freelist_next = fd_freelist; |
| 272 | fd_freelist = fd; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 273 | |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 274 | grpc_lfev_destroy(&fd->read_closure); |
| 275 | grpc_lfev_destroy(&fd->write_closure); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 276 | |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 277 | gpr_mu_unlock(&fd_freelist_mu); |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 278 | } |
| 279 | |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 280 | #ifndef NDEBUG |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 281 | static void unref_by(grpc_exec_ctx *exec_ctx, grpc_fd *fd, int n, |
| 282 | const char *reason, const char *file, int line) { |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 283 | if (GRPC_TRACER_ON(grpc_trace_fd_refcount)) { |
| 284 | gpr_log(GPR_DEBUG, |
| 285 | "FD %d %p unref %d %" PRIdPTR " -> %" PRIdPTR " [%s; %s:%d]", |
| 286 | fd->fd, fd, n, gpr_atm_no_barrier_load(&fd->refst), |
| 287 | gpr_atm_no_barrier_load(&fd->refst) - n, reason, file, line); |
| 288 | } |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 289 | #else |
| 290 | static void unref_by(grpc_exec_ctx *exec_ctx, grpc_fd *fd, int n) { |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 291 | #endif |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 292 | gpr_atm old = gpr_atm_full_fetch_add(&fd->refst, -n); |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 293 | if (old == n) { |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 294 | GRPC_CLOSURE_SCHED(exec_ctx, GRPC_CLOSURE_CREATE(fd_destroy, fd, |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 295 | grpc_schedule_on_exec_ctx), |
| 296 | GRPC_ERROR_NONE); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 297 | } else { |
| 298 | GPR_ASSERT(old > n); |
| 299 | } |
| 300 | } |
| 301 | |
| 302 | static void fd_global_init(void) { gpr_mu_init(&fd_freelist_mu); } |
| 303 | |
| 304 | static void fd_global_shutdown(void) { |
| 305 | gpr_mu_lock(&fd_freelist_mu); |
| 306 | gpr_mu_unlock(&fd_freelist_mu); |
| 307 | while (fd_freelist != NULL) { |
| 308 | grpc_fd *fd = fd_freelist; |
| 309 | fd_freelist = fd_freelist->freelist_next; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 310 | gpr_free(fd); |
| 311 | } |
| 312 | gpr_mu_destroy(&fd_freelist_mu); |
| 313 | } |
| 314 | |
| 315 | static grpc_fd *fd_create(int fd, const char *name) { |
| 316 | grpc_fd *new_fd = NULL; |
| 317 | |
| 318 | gpr_mu_lock(&fd_freelist_mu); |
| 319 | if (fd_freelist != NULL) { |
| 320 | new_fd = fd_freelist; |
| 321 | fd_freelist = fd_freelist->freelist_next; |
| 322 | } |
| 323 | gpr_mu_unlock(&fd_freelist_mu); |
| 324 | |
| 325 | if (new_fd == NULL) { |
Yash Tibrewal | ca3c1c0 | 2017-09-07 22:47:16 -0700 | [diff] [blame] | 326 | new_fd = (grpc_fd *)gpr_malloc(sizeof(grpc_fd)); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 327 | } |
| 328 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 329 | gpr_mu_init(&new_fd->pollable_mu); |
| 330 | new_fd->pollable_obj = NULL; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 331 | gpr_atm_rel_store(&new_fd->refst, (gpr_atm)1); |
| 332 | new_fd->fd = fd; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 333 | grpc_lfev_init(&new_fd->read_closure); |
| 334 | grpc_lfev_init(&new_fd->write_closure); |
| 335 | gpr_atm_no_barrier_store(&new_fd->read_notifier_pollset, (gpr_atm)NULL); |
| 336 | |
| 337 | new_fd->freelist_next = NULL; |
| 338 | new_fd->on_done_closure = NULL; |
| 339 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 340 | char *fd_name; |
| 341 | gpr_asprintf(&fd_name, "%s fd=%d", name, fd); |
| 342 | grpc_iomgr_register_object(&new_fd->iomgr_object, fd_name); |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 343 | #ifndef NDEBUG |
| 344 | if (GRPC_TRACER_ON(grpc_trace_fd_refcount)) { |
| 345 | gpr_log(GPR_DEBUG, "FD %d %p create %s", fd, new_fd, fd_name); |
| 346 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 347 | #endif |
| 348 | gpr_free(fd_name); |
| 349 | return new_fd; |
| 350 | } |
| 351 | |
| 352 | static int fd_wrapped_fd(grpc_fd *fd) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 353 | int ret_fd = fd->fd; |
| 354 | return (gpr_atm_acq_load(&fd->refst) & 1) ? ret_fd : -1; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 355 | } |
| 356 | |
| 357 | static void fd_orphan(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 358 | grpc_closure *on_done, int *release_fd, |
Yuchen Zeng | d40a7ae | 2017-07-12 15:59:56 -0700 | [diff] [blame] | 359 | bool already_closed, const char *reason) { |
| 360 | bool is_fd_closed = already_closed; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 361 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 362 | fd->on_done_closure = on_done; |
| 363 | |
| 364 | /* If release_fd is not NULL, we should be relinquishing control of the file |
| 365 | descriptor fd->fd (but we still own the grpc_fd structure). */ |
| 366 | if (release_fd != NULL) { |
| 367 | *release_fd = fd->fd; |
Yuchen Zeng | d40a7ae | 2017-07-12 15:59:56 -0700 | [diff] [blame] | 368 | } else if (!is_fd_closed) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 369 | close(fd->fd); |
| 370 | is_fd_closed = true; |
| 371 | } |
| 372 | |
Craig Tiller | f4360d7 | 2017-04-07 08:51:00 -0700 | [diff] [blame] | 373 | if (!is_fd_closed) { |
| 374 | gpr_log(GPR_DEBUG, "TODO: handle fd removal?"); |
| 375 | } |
| 376 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 377 | /* Remove the active status but keep referenced. We want this grpc_fd struct |
| 378 | to be alive (and not added to freelist) until the end of this function */ |
| 379 | REF_BY(fd, 1, reason); |
| 380 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 381 | GRPC_CLOSURE_SCHED(exec_ctx, fd->on_done_closure, GRPC_ERROR_NONE); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 382 | |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 383 | UNREF_BY(exec_ctx, fd, 2, reason); /* Drop the reference */ |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 384 | } |
| 385 | |
| 386 | static grpc_pollset *fd_get_read_notifier_pollset(grpc_exec_ctx *exec_ctx, |
| 387 | grpc_fd *fd) { |
| 388 | gpr_atm notifier = gpr_atm_acq_load(&fd->read_notifier_pollset); |
| 389 | return (grpc_pollset *)notifier; |
| 390 | } |
| 391 | |
| 392 | static bool fd_is_shutdown(grpc_fd *fd) { |
| 393 | return grpc_lfev_is_shutdown(&fd->read_closure); |
| 394 | } |
| 395 | |
| 396 | /* Might be called multiple times */ |
| 397 | static void fd_shutdown(grpc_exec_ctx *exec_ctx, grpc_fd *fd, grpc_error *why) { |
| 398 | if (grpc_lfev_set_shutdown(exec_ctx, &fd->read_closure, |
| 399 | GRPC_ERROR_REF(why))) { |
| 400 | shutdown(fd->fd, SHUT_RDWR); |
| 401 | grpc_lfev_set_shutdown(exec_ctx, &fd->write_closure, GRPC_ERROR_REF(why)); |
| 402 | } |
| 403 | GRPC_ERROR_UNREF(why); |
| 404 | } |
| 405 | |
| 406 | static void fd_notify_on_read(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 407 | grpc_closure *closure) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 408 | grpc_lfev_notify_on(exec_ctx, &fd->read_closure, closure, "read"); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 409 | } |
| 410 | |
| 411 | static void fd_notify_on_write(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 412 | grpc_closure *closure) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 413 | grpc_lfev_notify_on(exec_ctx, &fd->write_closure, closure, "write"); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 414 | } |
| 415 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 416 | /******************************************************************************* |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 417 | * Pollable Definitions |
| 418 | */ |
| 419 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 420 | static grpc_error *pollable_create(pollable_type type, pollable **p) { |
| 421 | *p = NULL; |
| 422 | |
| 423 | int epfd = epoll_create1(EPOLL_CLOEXEC); |
| 424 | if (epfd == -1) { |
| 425 | return GRPC_OS_ERROR(errno, "epoll_create1"); |
| 426 | } |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 427 | *p = gpr_malloc(sizeof(**p)); |
| 428 | grpc_error *err = grpc_wakeup_fd_init(&(*p)->wakeup); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 429 | if (err != GRPC_ERROR_NONE) { |
| 430 | close(epfd); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 431 | gpr_free(*p); |
| 432 | *p = NULL; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 433 | return err; |
| 434 | } |
| 435 | struct epoll_event ev; |
| 436 | ev.events = (uint32_t)(EPOLLIN | EPOLLET); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 437 | ev.data.ptr = (void*)(1 | (intptr_t)&(*p)->wakeup); |
| 438 | if (epoll_ctl(epfd, EPOLL_CTL_ADD, (*p)->wakeup.read_fd, &ev) != 0) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 439 | err = GRPC_OS_ERROR(errno, "epoll_ctl"); |
| 440 | close(epfd); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 441 | grpc_wakeup_fd_destroy(&(*p)->wakeup); |
| 442 | gpr_free(*p); |
| 443 | *p = NULL; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 444 | return err; |
| 445 | } |
| 446 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 447 | (*p)->type = type; |
| 448 | gpr_ref_init(&(*p)->refs, 1); |
Craig Tiller | 65da0ef | 2017-10-02 15:35:59 -0700 | [diff] [blame] | 449 | gpr_mu_init(&(*p)->mu); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 450 | (*p)->epfd = epfd; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 451 | (*p)->owner_fd = NULL; |
| 452 | (*p)->pollset_set = NULL; |
| 453 | (*p)->next = (*p)->prev = *p; |
| 454 | (*p)->root_worker = NULL; |
| 455 | return GRPC_ERROR_NONE; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 456 | } |
| 457 | |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 458 | #ifdef NDEBUG |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 459 | static pollable *pollable_ref(pollable *p) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 460 | #else |
| 461 | static pollable *pollable_ref(pollable *p, int line, const char *reason) { |
| 462 | if (GRPC_TRACER_ON(grpc_trace_pollable_refcount)) { |
| 463 | int r = (int)gpr_atm_no_barrier_load(&p->refs.count); |
| 464 | gpr_log(__FILE__, line, GPR_LOG_SEVERITY_DEBUG, "POLLABLE:%p ref %d->%d %s", p, r, r+1, reason); |
| 465 | } |
| 466 | #endif |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 467 | gpr_ref(&p->refs); |
| 468 | return p; |
| 469 | } |
| 470 | |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 471 | #ifdef NDEBUG |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 472 | static void pollable_unref(pollable *p) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 473 | #else |
| 474 | static void pollable_unref(pollable *p, int line, const char *reason) { |
| 475 | if (p == NULL) return; |
| 476 | if (GRPC_TRACER_ON(grpc_trace_pollable_refcount)) { |
| 477 | int r = (int)gpr_atm_no_barrier_load(&p->refs.count); |
| 478 | gpr_log(__FILE__, line, GPR_LOG_SEVERITY_DEBUG, "POLLABLE:%p unref %d->%d %s", p, r, r-1, reason); |
| 479 | } |
| 480 | #endif |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 481 | if (p != NULL && gpr_unref(&p->refs)) { |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 482 | close(p->epfd); |
| 483 | grpc_wakeup_fd_destroy(&p->wakeup); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 484 | gpr_free(p); |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 485 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 486 | } |
| 487 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 488 | static grpc_error *pollable_add_fd(pollable *p, grpc_fd *fd) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 489 | grpc_error *error = GRPC_ERROR_NONE; |
| 490 | static const char *err_desc = "pollable_add_fd"; |
| 491 | const int epfd = p->epfd; |
| 492 | |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 493 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 494 | gpr_log(GPR_DEBUG, "add fd %p (%d) to pollable %p", fd, fd->fd, p); |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 495 | } |
| 496 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 497 | struct epoll_event ev_fd; |
| 498 | ev_fd.events = (uint32_t)(EPOLLET | EPOLLIN | EPOLLOUT | EPOLLEXCLUSIVE); |
| 499 | ev_fd.data.ptr = fd; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 500 | if (epoll_ctl(epfd, EPOLL_CTL_ADD, fd->fd, &ev_fd) != 0) { |
| 501 | switch (errno) { |
Craig Tiller | 61f96c1 | 2017-05-12 13:36:39 -0700 | [diff] [blame] | 502 | case EEXIST: |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 503 | break; |
| 504 | default: |
| 505 | append_error(&error, GRPC_OS_ERROR(errno, "epoll_ctl"), err_desc); |
| 506 | } |
| 507 | } |
| 508 | |
| 509 | return error; |
| 510 | } |
| 511 | |
| 512 | /******************************************************************************* |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 513 | * Pollset Definitions |
| 514 | */ |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 515 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 516 | GPR_TLS_DECL(g_current_thread_pollset); |
| 517 | GPR_TLS_DECL(g_current_thread_worker); |
| 518 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 519 | /* Global state management */ |
| 520 | static grpc_error *pollset_global_init(void) { |
| 521 | gpr_tls_init(&g_current_thread_pollset); |
| 522 | gpr_tls_init(&g_current_thread_worker); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 523 | return pollable_create(PO_EMPTY, &g_empty_pollable); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 524 | } |
| 525 | |
| 526 | static void pollset_global_shutdown(void) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 527 | POLLABLE_UNREF(g_empty_pollable, "g_empty_pollable"); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 528 | gpr_tls_destroy(&g_current_thread_pollset); |
| 529 | gpr_tls_destroy(&g_current_thread_worker); |
| 530 | } |
| 531 | |
Craig Tiller | e16722c | 2017-05-17 21:50:37 +0000 | [diff] [blame] | 532 | static void pollset_maybe_finish_shutdown(grpc_exec_ctx *exec_ctx, |
| 533 | grpc_pollset *pollset) { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 534 | if (pollset->shutdown_closure != NULL && pollset->root_worker == NULL) { |
Craig Tiller | ca669b0 | 2017-06-09 12:41:51 -0700 | [diff] [blame] | 535 | GRPC_CLOSURE_SCHED(exec_ctx, pollset->shutdown_closure, GRPC_ERROR_NONE); |
Craig Tiller | e16722c | 2017-05-17 21:50:37 +0000 | [diff] [blame] | 536 | pollset->shutdown_closure = NULL; |
| 537 | } |
| 538 | } |
| 539 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 540 | /* both pollset->active_pollable->mu, pollset->mu must be held before calling |
| 541 | * this function */ |
| 542 | static grpc_error *pollset_kick_one(grpc_exec_ctx *exec_ctx, |
| 543 | grpc_pollset *pollset, |
| 544 | grpc_pollset_worker *specific_worker) { |
Craig Tiller | 3d073c2 | 2017-10-04 22:10:58 +0000 | [diff] [blame^] | 545 | pollable *p = specific_worker->pollable_obj; |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 546 | GPR_ASSERT(specific_worker != NULL); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 547 | if (specific_worker->kicked) { |
| 548 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 549 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_but_already_kicked", p); |
| 550 | } |
| 551 | return GRPC_ERROR_NONE; |
| 552 | } else if (gpr_tls_get(&g_current_thread_worker) == |
| 553 | (intptr_t)specific_worker) { |
| 554 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 555 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_but_awake", p); |
| 556 | } |
| 557 | specific_worker->kicked = true; |
| 558 | return GRPC_ERROR_NONE; |
| 559 | } else if (specific_worker == p->root_worker) { |
| 560 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 561 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_via_wakeup_fd", p); |
| 562 | } |
| 563 | specific_worker->kicked = true; |
| 564 | return grpc_wakeup_fd_wakeup(&p->wakeup); |
| 565 | } else { |
Craig Tiller | 3d073c2 | 2017-10-04 22:10:58 +0000 | [diff] [blame^] | 566 | GPR_ASSERT(specific_worker->initialized_cv); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 567 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 568 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_via_cv", p); |
| 569 | } |
| 570 | specific_worker->kicked = true; |
| 571 | gpr_cv_signal(&specific_worker->cv); |
| 572 | return GRPC_ERROR_NONE; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 573 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 574 | } |
| 575 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 576 | /* both pollset->active_pollable->mu, pollset->mu must be held before calling |
| 577 | * this function */ |
| 578 | static grpc_error *pollset_kick_inner(grpc_exec_ctx *exec_ctx, |
| 579 | grpc_pollset *pollset, |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 580 | grpc_pollset_worker *specific_worker) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 581 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 582 | gpr_log(GPR_DEBUG, |
Craig Tiller | 3d073c2 | 2017-10-04 22:10:58 +0000 | [diff] [blame^] | 583 | "PS:%p kick %p tls_pollset=%p tls_worker=%p pollset.root_worker=%p", |
| 584 | pollset, specific_worker, (void *)gpr_tls_get(&g_current_thread_pollset), |
| 585 | (void *)gpr_tls_get(&g_current_thread_worker), pollset->root_worker); |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 586 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 587 | if (specific_worker == NULL) { |
Craig Tiller | b72a74a | 2017-04-27 12:07:05 -0700 | [diff] [blame] | 588 | if (gpr_tls_get(&g_current_thread_pollset) != (intptr_t)pollset) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 589 | if (pollset->root_worker == NULL) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 590 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 3d073c2 | 2017-10-04 22:10:58 +0000 | [diff] [blame^] | 591 | gpr_log(GPR_DEBUG, "PS:%p kicked_any_without_poller", pollset); |
Craig Tiller | 1ad9477 | 2017-04-11 16:15:19 +0000 | [diff] [blame] | 592 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 593 | pollset->kicked_without_poller = true; |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 594 | return GRPC_ERROR_NONE; |
| 595 | } else { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 596 | return pollset_kick_one(exec_ctx, pollset, pollset->root_worker); |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 597 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 598 | } else { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 599 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 3d073c2 | 2017-10-04 22:10:58 +0000 | [diff] [blame^] | 600 | gpr_log(GPR_DEBUG, "PS:%p kicked_any_but_awake", pollset); |
Craig Tiller | 1ad9477 | 2017-04-11 16:15:19 +0000 | [diff] [blame] | 601 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 602 | return GRPC_ERROR_NONE; |
| 603 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 604 | } else { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 605 | return pollset_kick_one(exec_ctx, pollset, specific_worker); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 606 | } |
Craig Tiller | 26017de | 2017-04-15 00:07:25 +0000 | [diff] [blame] | 607 | } |
| 608 | |
Craig Tiller | 0ff222a | 2017-09-01 09:41:43 -0700 | [diff] [blame] | 609 | static grpc_error *pollset_kick(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
Craig Tiller | 26017de | 2017-04-15 00:07:25 +0000 | [diff] [blame] | 610 | grpc_pollset_worker *specific_worker) { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 611 | pollable *p = pollset->active_pollable; |
| 612 | gpr_mu_lock(&p->mu); |
| 613 | grpc_error *error = pollset_kick_inner(exec_ctx, pollset, specific_worker); |
| 614 | gpr_mu_unlock(&p->mu); |
Craig Tiller | 26017de | 2017-04-15 00:07:25 +0000 | [diff] [blame] | 615 | return error; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 616 | } |
| 617 | |
| 618 | static grpc_error *pollset_kick_all(grpc_exec_ctx *exec_ctx, |
| 619 | grpc_pollset *pollset) { |
| 620 | pollable *p = pollset->active_pollable; |
| 621 | grpc_error *error = GRPC_ERROR_NONE; |
| 622 | const char *err_desc = "pollset_kick_all"; |
| 623 | gpr_mu_lock(&p->mu); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 624 | grpc_pollset_worker *w = pollset->root_worker; |
| 625 | if (w!=NULL) { |
| 626 | do { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 627 | append_error(&error, pollset_kick_one(exec_ctx, pollset, w), err_desc); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 628 | w = w->links[PWLINK_POLLSET].next; |
| 629 | } while (w != pollset->root_worker); |
| 630 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 631 | gpr_mu_unlock(&p->mu); |
| 632 | return error; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 633 | } |
| 634 | |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 635 | static void pollset_init(grpc_pollset *pollset, gpr_mu **mu) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 636 | gpr_mu_init(&pollset->mu); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 637 | pollset->active_pollable = POLLABLE_REF(g_empty_pollable, "pollset"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 638 | *mu = &pollset->mu; |
Craig Tiller | 9f01251 | 2017-04-13 15:37:14 -0700 | [diff] [blame] | 639 | } |
| 640 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 641 | /* Convert a timespec to milliseconds: |
| 642 | - Very small or negative poll times are clamped to zero to do a non-blocking |
| 643 | poll (which becomes spin polling) |
| 644 | - Other small values are rounded up to one millisecond |
| 645 | - Longer than a millisecond polls are rounded up to the next nearest |
| 646 | millisecond to avoid spinning |
| 647 | - Infinite timeouts are converted to -1 */ |
| 648 | static int poll_deadline_to_millis_timeout(gpr_timespec deadline, |
| 649 | gpr_timespec now) { |
| 650 | gpr_timespec timeout; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 651 | if (gpr_time_cmp(deadline, gpr_inf_future(deadline.clock_type)) == 0) { |
| 652 | return -1; |
| 653 | } |
| 654 | |
Craig Tiller | 7f5fac9 | 2017-04-07 21:47:41 +0000 | [diff] [blame] | 655 | if (gpr_time_cmp(deadline, now) <= 0) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 656 | return 0; |
| 657 | } |
Craig Tiller | 7f5fac9 | 2017-04-07 21:47:41 +0000 | [diff] [blame] | 658 | |
Craig Tiller | 8c6878b | 2017-04-07 15:15:30 -0700 | [diff] [blame] | 659 | static const gpr_timespec round_up = { |
Yash Tibrewal | 06312bd | 2017-09-18 15:10:22 -0700 | [diff] [blame] | 660 | 0, /* tv_sec */ |
| 661 | GPR_NS_PER_MS - 1, /* tv_nsec */ |
| 662 | GPR_TIMESPAN /* clock_type */ |
| 663 | }; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 664 | timeout = gpr_time_sub(deadline, now); |
Craig Tiller | 7f5fac9 | 2017-04-07 21:47:41 +0000 | [diff] [blame] | 665 | int millis = gpr_time_to_millis(gpr_time_add(timeout, round_up)); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 666 | return millis >= 1 ? millis : 1; |
| 667 | } |
| 668 | |
| 669 | static void fd_become_readable(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 670 | grpc_pollset *notifier) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 671 | grpc_lfev_set_ready(exec_ctx, &fd->read_closure, "read"); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 672 | |
| 673 | /* Note, it is possible that fd_become_readable might be called twice with |
| 674 | different 'notifier's when an fd becomes readable and it is in two epoll |
| 675 | sets (This can happen briefly during polling island merges). In such cases |
| 676 | it does not really matter which notifer is set as the read_notifier_pollset |
| 677 | (They would both point to the same polling island anyway) */ |
| 678 | /* Use release store to match with acquire load in fd_get_read_notifier */ |
| 679 | gpr_atm_rel_store(&fd->read_notifier_pollset, (gpr_atm)notifier); |
| 680 | } |
| 681 | |
| 682 | 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] | 683 | grpc_lfev_set_ready(exec_ctx, &fd->write_closure, "write"); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 684 | } |
| 685 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 686 | static grpc_error *fd_become_pollable(grpc_fd *fd, pollable **p) { |
| 687 | gpr_mu_lock(&fd->pollable_mu); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 688 | grpc_error *error = GRPC_ERROR_NONE; |
| 689 | static const char *err_desc = "fd_become_pollable"; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 690 | if (fd->pollable_obj == NULL) { |
| 691 | if (append_error(&error, pollable_create(PO_FD, &fd->pollable_obj), |
| 692 | err_desc)) { |
Craig Tiller | 3990871 | 2017-10-02 22:58:24 +0000 | [diff] [blame] | 693 | fd->pollable_obj->owner_fd = fd; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 694 | if (!append_error(&error, pollable_add_fd(fd->pollable_obj, fd), |
| 695 | err_desc)) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 696 | POLLABLE_UNREF(fd->pollable_obj, "fd_pollable"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 697 | fd->pollable_obj = NULL; |
| 698 | } |
| 699 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 700 | } |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 701 | if (error == GRPC_ERROR_NONE) { |
| 702 | GPR_ASSERT(fd->pollable_obj != NULL); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 703 | *p = POLLABLE_REF(fd->pollable_obj, "pollset"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 704 | } else { |
| 705 | GPR_ASSERT(fd->pollable_obj == NULL); |
| 706 | *p = NULL; |
| 707 | } |
| 708 | gpr_mu_unlock(&fd->pollable_mu); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 709 | return error; |
| 710 | } |
| 711 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 712 | /* pollset->po.mu lock must be held by the caller before calling this */ |
| 713 | static void pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 714 | grpc_closure *closure) { |
| 715 | GPR_ASSERT(pollset->shutdown_closure == NULL); |
| 716 | pollset->shutdown_closure = closure; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 717 | GRPC_LOG_IF_ERROR("pollset_shutdown", pollset_kick_all(exec_ctx, pollset)); |
Craig Tiller | d9cd8f0 | 2017-04-07 16:26:02 -0700 | [diff] [blame] | 718 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 719 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 720 | |
Craig Tiller | 9bedddd | 2017-06-08 17:05:00 -0700 | [diff] [blame] | 721 | static grpc_error *pollset_process_events(grpc_exec_ctx *exec_ctx, |
| 722 | grpc_pollset *pollset, bool drain) { |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 723 | static const char *err_desc = "pollset_process_events"; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 724 | grpc_error *error = GRPC_ERROR_NONE; |
Craig Tiller | ca4fc66 | 2017-06-09 11:13:56 -0700 | [diff] [blame] | 725 | for (int i = 0; (drain || i < MAX_EPOLL_EVENTS_HANDLED_EACH_POLL_CALL) && |
| 726 | pollset->event_cursor != pollset->event_count; |
| 727 | i++) { |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 728 | int n = pollset->event_cursor++; |
| 729 | struct epoll_event *ev = &pollset->events[n]; |
| 730 | void *data_ptr = ev->data.ptr; |
| 731 | if (1 & (intptr_t)data_ptr) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 732 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 733 | gpr_log(GPR_DEBUG, "PS:%p got pollset_wakeup %p", pollset, data_ptr); |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 734 | } |
Yash Tibrewal | 52778c4 | 2017-09-11 15:00:11 -0700 | [diff] [blame] | 735 | append_error(&error, |
| 736 | grpc_wakeup_fd_consume_wakeup( |
| 737 | (grpc_wakeup_fd *)((~(intptr_t)1) & (intptr_t)data_ptr)), |
Craig Tiller | 9bedddd | 2017-06-08 17:05:00 -0700 | [diff] [blame] | 738 | err_desc); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 739 | } else { |
Craig Tiller | 61f96c1 | 2017-05-12 13:36:39 -0700 | [diff] [blame] | 740 | grpc_fd *fd = (grpc_fd *)data_ptr; |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 741 | bool cancel = (ev->events & (EPOLLERR | EPOLLHUP)) != 0; |
| 742 | bool read_ev = (ev->events & (EPOLLIN | EPOLLPRI)) != 0; |
| 743 | bool write_ev = (ev->events & EPOLLOUT) != 0; |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 744 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 745 | gpr_log(GPR_DEBUG, |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 746 | "PS:%p got fd %p: cancel=%d read=%d " |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 747 | "write=%d", |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 748 | pollset, fd, cancel, read_ev, write_ev); |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 749 | } |
Craig Tiller | 61f96c1 | 2017-05-12 13:36:39 -0700 | [diff] [blame] | 750 | if (read_ev || cancel) { |
| 751 | fd_become_readable(exec_ctx, fd, pollset); |
| 752 | } |
| 753 | if (write_ev || cancel) { |
| 754 | fd_become_writable(exec_ctx, fd); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 755 | } |
| 756 | } |
| 757 | } |
| 758 | |
| 759 | return error; |
| 760 | } |
| 761 | |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 762 | /* pollset_shutdown is guaranteed to be called before pollset_destroy. */ |
| 763 | static void pollset_destroy(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 764 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 765 | pollset->active_pollable = NULL; |
Craig Tiller | 9bedddd | 2017-06-08 17:05:00 -0700 | [diff] [blame] | 766 | GRPC_LOG_IF_ERROR("pollset_process_events", |
| 767 | pollset_process_events(exec_ctx, pollset, true)); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 768 | } |
| 769 | |
| 770 | static grpc_error *pollset_epoll(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 771 | pollable *p, gpr_timespec now, |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 772 | gpr_timespec deadline) { |
| 773 | int timeout = poll_deadline_to_millis_timeout(deadline, now); |
| 774 | |
| 775 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 776 | char *desc = pollable_desc(p); |
| 777 | gpr_log(GPR_DEBUG, "PS:%p poll %p[%s] for %dms", pollset, p, desc, timeout); |
| 778 | gpr_free(desc); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 779 | } |
| 780 | |
| 781 | if (timeout != 0) { |
| 782 | GRPC_SCHEDULING_START_BLOCKING_REGION; |
| 783 | } |
| 784 | int r; |
| 785 | do { |
Craig Tiller | b4bb1cd | 2017-07-20 14:18:17 -0700 | [diff] [blame] | 786 | GRPC_STATS_INC_SYSCALL_POLL(exec_ctx); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 787 | r = epoll_wait(p->epfd, pollset->events, MAX_EPOLL_EVENTS, timeout); |
| 788 | } while (r < 0 && errno == EINTR); |
| 789 | if (timeout != 0) { |
| 790 | GRPC_SCHEDULING_END_BLOCKING_REGION; |
| 791 | } |
| 792 | |
| 793 | if (r < 0) return GRPC_OS_ERROR(errno, "epoll_wait"); |
| 794 | |
| 795 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 796 | gpr_log(GPR_DEBUG, "PS:%p poll %p got %d events", pollset, p, r); |
| 797 | } |
| 798 | |
| 799 | pollset->event_cursor = 0; |
| 800 | pollset->event_count = r; |
| 801 | |
| 802 | return GRPC_ERROR_NONE; |
| 803 | } |
| 804 | |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 805 | /* Return true if first in list */ |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 806 | static bool worker_insert(grpc_pollset_worker **root_worker, |
| 807 | grpc_pollset_worker *worker, pwlinks link) { |
| 808 | if (*root_worker == NULL) { |
| 809 | *root_worker = worker; |
| 810 | worker->links[link].next = worker->links[link].prev = worker; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 811 | return true; |
| 812 | } else { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 813 | worker->links[link].next = *root_worker; |
| 814 | worker->links[link].prev = worker->links[link].next->links[link].prev; |
| 815 | worker->links[link].next->links[link].prev = worker; |
| 816 | worker->links[link].prev->links[link].next = worker; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 817 | return false; |
| 818 | } |
| 819 | } |
| 820 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 821 | /* returns the new root IFF the root changed */ |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 822 | typedef enum { WRR_NEW_ROOT, WRR_EMPTIED, WRR_REMOVED } worker_remove_result; |
| 823 | |
| 824 | static worker_remove_result worker_remove(grpc_pollset_worker **root_worker, |
| 825 | grpc_pollset_worker *worker, |
| 826 | pwlinks link) { |
| 827 | if (worker == *root_worker) { |
| 828 | if (worker == worker->links[link].next) { |
| 829 | *root_worker = NULL; |
| 830 | return WRR_EMPTIED; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 831 | } else { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 832 | *root_worker = worker->links[link].next; |
| 833 | worker->links[link].prev->links[link].next = worker->links[link].next; |
| 834 | worker->links[link].next->links[link].prev = worker->links[link].prev; |
| 835 | return WRR_NEW_ROOT; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 836 | } |
| 837 | } else { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 838 | worker->links[link].prev->links[link].next = worker->links[link].next; |
| 839 | worker->links[link].next->links[link].prev = worker->links[link].prev; |
| 840 | return WRR_REMOVED; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 841 | } |
| 842 | } |
| 843 | |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 844 | /* Return true if this thread should poll */ |
| 845 | static bool begin_worker(grpc_pollset *pollset, grpc_pollset_worker *worker, |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 846 | grpc_pollset_worker **worker_hdl, gpr_timespec *now, |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 847 | gpr_timespec deadline) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 848 | bool do_poll = true; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 849 | if (worker_hdl != NULL) *worker_hdl = worker; |
Craig Tiller | 9f01251 | 2017-04-13 15:37:14 -0700 | [diff] [blame] | 850 | worker->initialized_cv = false; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 851 | worker->kicked = false; |
| 852 | worker->pollset = pollset; |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 853 | worker->pollable_obj = POLLABLE_REF(pollset->active_pollable, "pollset_worker"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 854 | worker_insert(&pollset->root_worker, worker, PWLINK_POLLSET); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 855 | gpr_mu_lock(&worker->pollable_obj->mu); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 856 | if (!worker_insert(&worker->pollable_obj->root_worker, worker, |
| 857 | PWLINK_POLLABLE)) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 858 | worker->initialized_cv = true; |
| 859 | gpr_cv_init(&worker->cv); |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 860 | if (GRPC_TRACER_ON(grpc_polling_trace) && |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 861 | worker->pollable_obj->root_worker != worker) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 862 | gpr_log(GPR_DEBUG, "PS:%p wait %p w=%p for %dms", pollset, |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 863 | worker->pollable_obj, worker, |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 864 | poll_deadline_to_millis_timeout(deadline, *now)); |
| 865 | } |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 866 | while (do_poll && worker->pollable_obj->root_worker != worker) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 867 | if (gpr_cv_wait(&worker->cv, &worker->pollable_obj->mu, deadline)) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 868 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 869 | gpr_log(GPR_DEBUG, "PS:%p timeout_wait %p w=%p", pollset, |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 870 | worker->pollable_obj, worker); |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 871 | } |
| 872 | do_poll = false; |
| 873 | } else if (worker->kicked) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 874 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 875 | gpr_log(GPR_DEBUG, "PS:%p wakeup %p w=%p", pollset, |
| 876 | worker->pollable_obj, worker); |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 877 | } |
| 878 | do_poll = false; |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 879 | } else if (GRPC_TRACER_ON(grpc_polling_trace) && |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 880 | worker->pollable_obj->root_worker != worker) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 881 | gpr_log(GPR_DEBUG, "PS:%p spurious_wakeup %p w=%p", pollset, |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 882 | worker->pollable_obj, worker); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 883 | } |
| 884 | } |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 885 | *now = gpr_now(now->clock_type); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 886 | } |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 887 | gpr_mu_unlock(&worker->pollable_obj->mu); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 888 | |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 889 | return do_poll && pollset->shutdown_closure == NULL && |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 890 | pollset->active_pollable == worker->pollable_obj; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 891 | } |
| 892 | |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 893 | static void end_worker(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 894 | grpc_pollset_worker *worker, |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 895 | grpc_pollset_worker **worker_hdl) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 896 | gpr_mu_lock(&worker->pollable_obj->mu); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 897 | if (worker_remove(&worker->pollable_obj->root_worker, worker, |
| 898 | PWLINK_POLLABLE) == WRR_NEW_ROOT) { |
| 899 | grpc_pollset_worker *new_root = worker->pollable_obj->root_worker; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 900 | GPR_ASSERT(new_root->initialized_cv); |
| 901 | gpr_cv_signal(&new_root->cv); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 902 | } |
| 903 | if (worker->initialized_cv) { |
| 904 | gpr_cv_destroy(&worker->cv); |
| 905 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 906 | if (worker_remove(&pollset->root_worker, worker, PWLINK_POLLSET)) { |
Craig Tiller | 3d073c2 | 2017-10-04 22:10:58 +0000 | [diff] [blame^] | 907 | gpr_mu_unlock(&worker->pollable_obj->mu); |
Craig Tiller | 227e11b | 2017-04-20 18:25:02 +0000 | [diff] [blame] | 908 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
Craig Tiller | 3d073c2 | 2017-10-04 22:10:58 +0000 | [diff] [blame^] | 909 | } else { |
| 910 | gpr_mu_unlock(&worker->pollable_obj->mu); |
Craig Tiller | 227e11b | 2017-04-20 18:25:02 +0000 | [diff] [blame] | 911 | } |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 912 | POLLABLE_UNREF(worker->pollable_obj, "pollset_worker"); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 913 | } |
| 914 | |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 915 | /* pollset->po.mu lock must be held by the caller before calling this. |
| 916 | The function pollset_work() may temporarily release the lock (pollset->po.mu) |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 917 | during the course of its execution but it will always re-acquire the lock and |
| 918 | ensure that it is held by the time the function returns */ |
| 919 | static grpc_error *pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 920 | grpc_pollset_worker **worker_hdl, |
| 921 | gpr_timespec now, gpr_timespec deadline) { |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 922 | #ifdef GRPC_EPOLLEX_CREATE_WORKERS_ON_HEAP |
| 923 | grpc_pollset_worker *worker = gpr_malloc(sizeof(*worker)); |
| 924 | #define WORKER_PTR (worker) |
| 925 | #else |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 926 | grpc_pollset_worker worker; |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 927 | #define WORKER_PTR (&worker) |
| 928 | #endif |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 929 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 930 | gpr_log(GPR_DEBUG, "PS:%p work hdl=%p worker=%p now=%" PRId64 |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 931 | ".%09d deadline=%" PRId64 ".%09d kwp=%d pollable=%p", |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 932 | pollset, worker_hdl, WORKER_PTR, now.tv_sec, now.tv_nsec, |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 933 | deadline.tv_sec, deadline.tv_nsec, pollset->kicked_without_poller, pollset->active_pollable); |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 934 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 935 | static const char *err_desc = "pollset_work"; |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 936 | grpc_error *error = GRPC_ERROR_NONE; |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 937 | if (pollset->kicked_without_poller) { |
| 938 | pollset->kicked_without_poller = false; |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 939 | } else { |
| 940 | if (begin_worker(pollset, WORKER_PTR, worker_hdl, &now, deadline)) { |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 941 | gpr_tls_set(&g_current_thread_pollset, (intptr_t)pollset); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 942 | gpr_tls_set(&g_current_thread_worker, (intptr_t)WORKER_PTR); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 943 | GPR_ASSERT(!pollset->shutdown_closure); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 944 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 945 | if (pollset->event_cursor == pollset->event_count) { |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 946 | append_error(&error, pollset_epoll(exec_ctx, pollset, WORKER_PTR->pollable_obj, |
Craig Tiller | 9bedddd | 2017-06-08 17:05:00 -0700 | [diff] [blame] | 947 | now, deadline), |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 948 | err_desc); |
| 949 | } |
Craig Tiller | 9bedddd | 2017-06-08 17:05:00 -0700 | [diff] [blame] | 950 | append_error(&error, pollset_process_events(exec_ctx, pollset, false), |
| 951 | err_desc); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 952 | grpc_exec_ctx_flush(exec_ctx); |
| 953 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 954 | gpr_tls_set(&g_current_thread_pollset, 0); |
| 955 | gpr_tls_set(&g_current_thread_worker, 0); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 956 | } |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 957 | end_worker(exec_ctx, pollset, WORKER_PTR, worker_hdl); |
| 958 | } |
| 959 | #ifdef GRPC_EPOLLEX_CREATE_WORKERS_ON_HEAP |
| 960 | gpr_free(worker); |
| 961 | #endif |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 962 | return error; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 963 | } |
| 964 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 965 | static grpc_error *pollset_transition_pollable_from_empty_to_fd_locked( |
| 966 | grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, grpc_fd *fd) { |
| 967 | static const char *err_desc = "pollset_transition_pollable_from_empty_to_fd"; |
| 968 | grpc_error *error = GRPC_ERROR_NONE; |
| 969 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 970 | gpr_log(GPR_DEBUG, "PS:%p add fd %p (%d); transition pollable from empty to fd", |
| 971 | pollset, fd, fd->fd); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 972 | } |
| 973 | append_error(&error, pollset_kick_all(exec_ctx, pollset), err_desc); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 974 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 975 | append_error(&error, fd_become_pollable(fd, &pollset->active_pollable), |
| 976 | err_desc); |
| 977 | return error; |
| 978 | } |
| 979 | |
| 980 | static grpc_error *pollset_transition_pollable_from_fd_to_multi_locked( |
| 981 | grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, grpc_fd *and_add_fd) { |
| 982 | static const char *err_desc = "pollset_transition_pollable_from_fd_to_multi"; |
| 983 | grpc_error *error = GRPC_ERROR_NONE; |
| 984 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 985 | gpr_log(GPR_DEBUG, |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 986 | "PS:%p add fd %p (%d); transition pollable from fd %p to multipoller", |
| 987 | pollset, and_add_fd, and_add_fd?and_add_fd->fd:-1, pollset->active_pollable->owner_fd); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 988 | } |
| 989 | append_error(&error, pollset_kick_all(exec_ctx, pollset), err_desc); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 990 | grpc_fd *initial_fd = pollset->active_pollable->owner_fd; |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 991 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
| 992 | pollset->active_pollable = NULL; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 993 | if (append_error(&error, pollable_create(PO_MULTI, &pollset->active_pollable), |
| 994 | err_desc)) { |
| 995 | append_error(&error, pollable_add_fd(pollset->active_pollable, initial_fd), |
| 996 | err_desc); |
| 997 | if (and_add_fd != NULL) { |
| 998 | append_error(&error, |
| 999 | pollable_add_fd(pollset->active_pollable, and_add_fd), |
| 1000 | err_desc); |
| 1001 | } |
| 1002 | } |
| 1003 | return error; |
| 1004 | } |
| 1005 | |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1006 | /* expects pollsets locked, flag whether fd is locked or not */ |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 1007 | static grpc_error *pollset_add_fd_locked(grpc_exec_ctx *exec_ctx, |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1008 | grpc_pollset *pollset, grpc_fd *fd) { |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1009 | grpc_error *error = GRPC_ERROR_NONE; |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1010 | pollable *po_at_start = POLLABLE_REF(pollset->active_pollable, "pollset_add_fd"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1011 | switch (pollset->active_pollable->type) { |
| 1012 | case PO_EMPTY: |
| 1013 | /* empty pollable --> single fd pollable */ |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1014 | error = pollset_transition_pollable_from_empty_to_fd_locked(exec_ctx, |
| 1015 | pollset, fd); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1016 | break; |
| 1017 | case PO_FD: |
| 1018 | /* fd --> multipoller */ |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1019 | error = pollset_transition_pollable_from_fd_to_multi_locked(exec_ctx, |
| 1020 | pollset, fd); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1021 | break; |
| 1022 | case PO_MULTI: |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1023 | error = pollable_add_fd(pollset->active_pollable, fd); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1024 | break; |
| 1025 | } |
| 1026 | if (error != GRPC_ERROR_NONE) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1027 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1028 | pollset->active_pollable = po_at_start; |
| 1029 | } else { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1030 | POLLABLE_UNREF(po_at_start, "pollset_add_fd"); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 1031 | } |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1032 | return error; |
| 1033 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 1034 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1035 | static grpc_error *pollset_as_multipollable(grpc_exec_ctx *exec_ctx, |
| 1036 | grpc_pollset *pollset, |
| 1037 | pollable **pollable_obj) { |
| 1038 | grpc_error *error = GRPC_ERROR_NONE; |
| 1039 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1040 | pollable *po_at_start = POLLABLE_REF(pollset->active_pollable, "pollset_as_multipollable"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1041 | switch (pollset->active_pollable->type) { |
| 1042 | case PO_EMPTY: |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1043 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1044 | error = pollable_create(PO_MULTI, &pollset->active_pollable); |
| 1045 | break; |
| 1046 | case PO_FD: |
| 1047 | error = pollset_transition_pollable_from_fd_to_multi_locked( |
| 1048 | exec_ctx, pollset, NULL); |
| 1049 | break; |
| 1050 | case PO_MULTI: |
| 1051 | break; |
| 1052 | } |
| 1053 | if (error != GRPC_ERROR_NONE) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1054 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1055 | pollset->active_pollable = po_at_start; |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1056 | *pollable_obj = NULL; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1057 | } else { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1058 | *pollable_obj = POLLABLE_REF(pollset->active_pollable, "pollset_set"); |
| 1059 | POLLABLE_UNREF(po_at_start, "pollset_as_multipollable"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1060 | } |
| 1061 | gpr_mu_unlock(&pollset->mu); |
| 1062 | return error; |
| 1063 | } |
| 1064 | |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1065 | static void pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 1066 | grpc_fd *fd) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1067 | gpr_mu_lock(&pollset->mu); |
| 1068 | grpc_error *error = pollset_add_fd_locked(exec_ctx, pollset, fd); |
| 1069 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 1070 | GRPC_LOG_IF_ERROR("pollset_add_fd", error); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1071 | } |
| 1072 | |
| 1073 | /******************************************************************************* |
| 1074 | * Pollset-set Definitions |
| 1075 | */ |
| 1076 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1077 | static grpc_pollset_set *pss_lock_adam(grpc_pollset_set *pss) { |
| 1078 | gpr_mu_lock(&pss->mu); |
| 1079 | while (pss->parent != NULL) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1080 | gpr_mu_unlock(&pss->mu); |
| 1081 | pss = pss->parent; |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1082 | gpr_mu_lock(&pss->mu); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1083 | } |
| 1084 | return pss; |
| 1085 | } |
| 1086 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1087 | static grpc_pollset_set *pollset_set_create(void) { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1088 | grpc_pollset_set *pss = (grpc_pollset_set *)gpr_zalloc(sizeof(*pss)); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1089 | gpr_mu_init(&pss->mu); |
| 1090 | gpr_ref_init(&pss->refs, 1); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1091 | return pss; |
| 1092 | } |
| 1093 | |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1094 | static void pollset_set_unref(grpc_exec_ctx *exec_ctx, |
| 1095 | grpc_pollset_set *pss) { |
| 1096 | if (pss == NULL) return; |
| 1097 | if (!gpr_unref(&pss->refs)) return; |
| 1098 | pollset_set_unref(exec_ctx, pss->parent); |
| 1099 | gpr_mu_destroy(&pss->mu); |
| 1100 | for (size_t i=0; i<pss->pollset_count; i++) { |
| 1101 | POLLABLE_UNREF(pss->pollsets[i], "pollset_set"); |
| 1102 | } |
| 1103 | for (size_t i=0;i<pss->fd_count; i++) { |
| 1104 | UNREF_BY(exec_ctx, pss->fds[i], 2, "pollset_set"); |
| 1105 | } |
| 1106 | gpr_free(pss->pollsets); |
| 1107 | gpr_free(pss->fds); |
| 1108 | gpr_free(pss); |
| 1109 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1110 | |
| 1111 | static void pollset_set_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset_set *pss, |
| 1112 | grpc_fd *fd) { |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1113 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 1114 | gpr_log(GPR_DEBUG, "PSS:%p: add fd %p (%d)", pss, fd, fd->fd); |
| 1115 | } |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1116 | grpc_error *error = GRPC_ERROR_NONE; |
| 1117 | static const char *err_desc = "pollset_set_add_fd"; |
| 1118 | pss = pss_lock_adam(pss); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1119 | for (size_t i = 0; i < pss->pollset_count; i++) { |
| 1120 | append_error(&error, pollable_add_fd(pss->pollsets[i], fd), err_desc); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1121 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1122 | if (pss->fd_count == pss->fd_capacity) { |
| 1123 | pss->fd_capacity = GPR_MAX(pss->fd_capacity * 2, 8); |
| 1124 | pss->fds = gpr_realloc(pss->fds, pss->fd_capacity * sizeof(*pss->fds)); |
| 1125 | } |
| 1126 | REF_BY(fd, 2, "pollset_set"); |
| 1127 | pss->fds[pss->fd_count++] = fd; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1128 | gpr_mu_unlock(&pss->mu); |
| 1129 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1130 | GRPC_LOG_IF_ERROR(err_desc, error); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1131 | } |
| 1132 | |
| 1133 | static void pollset_set_del_fd(grpc_exec_ctx *exec_ctx, grpc_pollset_set *pss, |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1134 | grpc_fd *fd) { |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1135 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 1136 | gpr_log(GPR_DEBUG, "PSS:%p: del fd %p", pss, fd); |
| 1137 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1138 | pss = pss_lock_adam(pss); |
| 1139 | size_t i; |
| 1140 | for (i = 0; i < pss->fd_count; i++) { |
| 1141 | if (pss->fds[i] == fd) { |
| 1142 | UNREF_BY(exec_ctx, fd, 2, "pollset_set"); |
| 1143 | break; |
| 1144 | } |
| 1145 | } |
| 1146 | GPR_ASSERT(i != pss->fd_count); |
| 1147 | for (; i < pss->fd_count - 1; i++) { |
| 1148 | pss->fds[i] = pss->fds[i + 1]; |
| 1149 | } |
| 1150 | pss->fd_count--; |
| 1151 | gpr_mu_unlock(&pss->mu); |
| 1152 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1153 | |
| 1154 | static void pollset_set_add_pollset(grpc_exec_ctx *exec_ctx, |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1155 | grpc_pollset_set *pss, grpc_pollset *ps) { |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1156 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 1157 | gpr_log(GPR_DEBUG, "PSS:%p: add pollset %p", pss, ps); |
| 1158 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1159 | grpc_error *error = GRPC_ERROR_NONE; |
| 1160 | static const char *err_desc = "pollset_set_add_pollset"; |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1161 | pollable *pollable_obj = NULL; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1162 | if (!GRPC_LOG_IF_ERROR( |
| 1163 | err_desc, pollset_as_multipollable(exec_ctx, ps, &pollable_obj))) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1164 | GPR_ASSERT(pollable_obj==NULL); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1165 | return; |
| 1166 | } |
| 1167 | pss = pss_lock_adam(pss); |
| 1168 | for (size_t i = 0; i < pss->fd_count; i++) { |
| 1169 | append_error(&error, pollable_add_fd(pollable_obj, pss->fds[i]), err_desc); |
| 1170 | } |
| 1171 | if (pss->pollset_count == pss->pollset_capacity) { |
| 1172 | pss->pollset_capacity = GPR_MAX(pss->pollset_capacity * 2, 8); |
| 1173 | pss->pollsets = gpr_realloc(pss->pollsets, |
| 1174 | pss->pollset_capacity * sizeof(*pss->pollsets)); |
| 1175 | } |
| 1176 | pss->pollsets[pss->pollset_count++] = pollable_obj; |
| 1177 | gpr_mu_unlock(&pss->mu); |
| 1178 | |
| 1179 | GRPC_LOG_IF_ERROR(err_desc, error); |
| 1180 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1181 | |
| 1182 | static void pollset_set_del_pollset(grpc_exec_ctx *exec_ctx, |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1183 | grpc_pollset_set *pss, grpc_pollset *ps) { |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1184 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 1185 | gpr_log(GPR_DEBUG, "PSS:%p: del pollset %p", pss, ps); |
| 1186 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1187 | pss = pss_lock_adam(pss); |
| 1188 | size_t i; |
| 1189 | for (i = 0; i < pss->pollset_count; i++) { |
| 1190 | if (pss->pollsets[i] == ps->active_pollable) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1191 | POLLABLE_UNREF(pss->pollsets[i], "pollset_set"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1192 | break; |
| 1193 | } |
| 1194 | } |
| 1195 | GPR_ASSERT(i != pss->pollset_count); |
| 1196 | for (; i < pss->pollset_count - 1; i++) { |
| 1197 | pss->pollsets[i] = pss->pollsets[i + 1]; |
| 1198 | } |
| 1199 | pss->pollset_count--; |
| 1200 | gpr_mu_unlock(&pss->mu); |
| 1201 | } |
| 1202 | |
| 1203 | static grpc_error *add_fds_to_pollables(grpc_exec_ctx *exec_ctx, grpc_fd **fds, |
| 1204 | size_t fd_count, pollable **pollables, |
| 1205 | size_t pollable_count, |
| 1206 | const char *err_desc) { |
| 1207 | grpc_error *error = GRPC_ERROR_NONE; |
| 1208 | for (size_t i = 0; i < fd_count; i++) { |
| 1209 | for (size_t j = 0; j < pollable_count; j++) { |
| 1210 | append_error(&error, pollable_add_fd(pollables[j], fds[i]), err_desc); |
| 1211 | } |
| 1212 | } |
| 1213 | return error; |
| 1214 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1215 | |
| 1216 | static void pollset_set_add_pollset_set(grpc_exec_ctx *exec_ctx, |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1217 | grpc_pollset_set *a, |
| 1218 | grpc_pollset_set *b) { |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1219 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 1220 | gpr_log(GPR_DEBUG, "PSS: merge (%p, %p)", a, b); |
| 1221 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1222 | grpc_error *error = GRPC_ERROR_NONE; |
| 1223 | static const char *err_desc = "pollset_set_add_fd"; |
| 1224 | for (;;) { |
| 1225 | if (a == b) { |
| 1226 | // pollset ancestors are the same: nothing to do |
| 1227 | return; |
| 1228 | } |
| 1229 | if (a > b) { |
| 1230 | GPR_SWAP(grpc_pollset_set *, a, b); |
| 1231 | } |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1232 | gpr_mu *a_mu = &a->mu; |
| 1233 | gpr_mu *b_mu = &b->mu; |
| 1234 | gpr_mu_lock(a_mu); |
| 1235 | gpr_mu_lock(b_mu); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1236 | if (a->parent != NULL) { |
| 1237 | a = a->parent; |
| 1238 | } else if (b->parent != NULL) { |
| 1239 | b = b->parent; |
| 1240 | } else { |
| 1241 | break; // exit loop, both pollsets locked |
| 1242 | } |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1243 | gpr_mu_unlock(a_mu); |
| 1244 | gpr_mu_unlock(b_mu); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1245 | } |
| 1246 | // try to do the least copying possible |
| 1247 | // TODO(ctiller): there's probably a better heuristic here |
| 1248 | const size_t a_size = a->fd_count + a->pollset_count; |
| 1249 | const size_t b_size = b->fd_count + b->pollset_count; |
| 1250 | if (b_size > a_size) { |
| 1251 | GPR_SWAP(grpc_pollset_set *, a, b); |
| 1252 | } |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1253 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 1254 | gpr_log(GPR_DEBUG, "PSS: parent %p to %p", b, a); |
| 1255 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1256 | gpr_ref(&a->refs); |
| 1257 | b->parent = a; |
| 1258 | append_error(&error, |
| 1259 | add_fds_to_pollables(exec_ctx, a->fds, a->fd_count, b->pollsets, |
| 1260 | b->pollset_count, "merge_a2b"), |
| 1261 | err_desc); |
| 1262 | append_error(&error, |
| 1263 | add_fds_to_pollables(exec_ctx, b->fds, b->fd_count, a->pollsets, |
| 1264 | a->pollset_count, "merge_b2a"), |
| 1265 | err_desc); |
| 1266 | if (a->fd_capacity < a->fd_count + b->fd_count) { |
| 1267 | a->fd_capacity = GPR_MAX(2 * a->fd_capacity, a->fd_count + b->fd_count); |
| 1268 | a->fds = gpr_realloc(a->fds, a->fd_capacity * sizeof(*a->fds)); |
| 1269 | } |
| 1270 | if (a->pollset_capacity < a->pollset_count + b->pollset_count) { |
| 1271 | a->pollset_capacity = |
| 1272 | GPR_MAX(2 * a->pollset_capacity, a->pollset_count + b->pollset_count); |
| 1273 | a->pollsets = |
| 1274 | gpr_realloc(a->pollsets, a->pollset_capacity * sizeof(*a->pollsets)); |
| 1275 | } |
| 1276 | memcpy(a->fds + a->fd_count, b->fds, b->fd_count * sizeof(*b->fds)); |
| 1277 | memcpy(a->pollsets + a->pollset_count, b->pollsets, |
| 1278 | b->pollset_count * sizeof(*b->pollsets)); |
| 1279 | a->fd_count += b->fd_count; |
| 1280 | a->pollset_count += b->pollset_count; |
| 1281 | gpr_free(b->fds); |
| 1282 | gpr_free(b->pollsets); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 1283 | b->fds = NULL; |
| 1284 | b->pollsets = NULL; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1285 | b->fd_count = b->fd_capacity = b->pollset_count = b->pollset_capacity = 0; |
| 1286 | gpr_mu_unlock(&a->mu); |
| 1287 | gpr_mu_unlock(&b->mu); |
| 1288 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1289 | |
| 1290 | static void pollset_set_del_pollset_set(grpc_exec_ctx *exec_ctx, |
| 1291 | grpc_pollset_set *bag, |
Craig Tiller | f081d89 | 2017-04-07 14:04:42 -0700 | [diff] [blame] | 1292 | grpc_pollset_set *item) {} |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1293 | |
| 1294 | /******************************************************************************* |
| 1295 | * Event engine binding |
| 1296 | */ |
| 1297 | |
| 1298 | static void shutdown_engine(void) { |
| 1299 | fd_global_shutdown(); |
| 1300 | pollset_global_shutdown(); |
| 1301 | } |
| 1302 | |
| 1303 | static const grpc_event_engine_vtable vtable = { |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1304 | sizeof(grpc_pollset), |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1305 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1306 | fd_create, |
| 1307 | fd_wrapped_fd, |
| 1308 | fd_orphan, |
| 1309 | fd_shutdown, |
| 1310 | fd_notify_on_read, |
| 1311 | fd_notify_on_write, |
| 1312 | fd_is_shutdown, |
| 1313 | fd_get_read_notifier_pollset, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1314 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1315 | pollset_init, |
| 1316 | pollset_shutdown, |
| 1317 | pollset_destroy, |
| 1318 | pollset_work, |
| 1319 | pollset_kick, |
| 1320 | pollset_add_fd, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1321 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1322 | pollset_set_create, |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1323 | pollset_set_unref, // destroy ==> unref 1 public ref |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1324 | pollset_set_add_pollset, |
| 1325 | pollset_set_del_pollset, |
| 1326 | pollset_set_add_pollset_set, |
| 1327 | pollset_set_del_pollset_set, |
| 1328 | pollset_set_add_fd, |
| 1329 | pollset_set_del_fd, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1330 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1331 | shutdown_engine, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1332 | }; |
| 1333 | |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 1334 | const grpc_event_engine_vtable *grpc_init_epollex_linux( |
| 1335 | bool explicitly_requested) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1336 | if (!grpc_has_wakeup_fd()) { |
| 1337 | return NULL; |
| 1338 | } |
| 1339 | |
Craig Tiller | 819cd88 | 2017-04-25 13:18:22 -0700 | [diff] [blame] | 1340 | if (!grpc_is_epollexclusive_available()) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1341 | return NULL; |
| 1342 | } |
| 1343 | |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1344 | grpc_register_tracer(&grpc_trace_pollable_refcount); |
| 1345 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1346 | fd_global_init(); |
| 1347 | |
| 1348 | if (!GRPC_LOG_IF_ERROR("pollset_global_init", pollset_global_init())) { |
Craig Tiller | 54d388d | 2017-04-14 16:20:45 -0700 | [diff] [blame] | 1349 | pollset_global_shutdown(); |
| 1350 | fd_global_shutdown(); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1351 | return NULL; |
| 1352 | } |
| 1353 | |
| 1354 | return &vtable; |
| 1355 | } |
| 1356 | |
| 1357 | #else /* defined(GRPC_LINUX_EPOLL) */ |
| 1358 | #if defined(GRPC_POSIX_SOCKET) |
| 1359 | #include "src/core/lib/iomgr/ev_posix.h" |
| 1360 | /* If GRPC_LINUX_EPOLL is not defined, it means epoll is not available. Return |
| 1361 | * NULL */ |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 1362 | const grpc_event_engine_vtable *grpc_init_epollex_linux( |
| 1363 | bool explicitly_requested) { |
| 1364 | return NULL; |
| 1365 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1366 | #endif /* defined(GRPC_POSIX_SOCKET) */ |
| 1367 | |
| 1368 | #endif /* !defined(GRPC_LINUX_EPOLL) */ |