Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 3 | * Copyright 2017 gRPC authors. |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -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 | c67cc99 | 2017-04-27 10:15:51 -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 | c67cc99 | 2017-04-27 10:15:51 -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 | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 16 | * |
| 17 | */ |
| 18 | |
| 19 | #include "src/core/lib/iomgr/port.h" |
| 20 | |
yang-g | ceb2475 | 2017-11-07 12:06:37 -0800 | [diff] [blame] | 21 | #include <grpc/support/log.h> |
| 22 | |
Mehrdad Afshari | 8b0e9fb | 2018-01-17 13:42:26 -0800 | [diff] [blame] | 23 | /* This polling engine is only relevant on linux kernels supporting epoll |
| 24 | epoll_create() or epoll_create1() */ |
Mehrdad Afshari | fb66900 | 2018-01-17 15:37:56 -0800 | [diff] [blame] | 25 | #ifdef GRPC_LINUX_EPOLL |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 26 | #include "src/core/lib/iomgr/ev_epoll1_linux.h" |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 27 | |
| 28 | #include <assert.h> |
| 29 | #include <errno.h> |
Mehrdad Afshari | 1957fd0 | 2018-01-16 17:22:01 -0800 | [diff] [blame] | 30 | #include <fcntl.h> |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 31 | #include <limits.h> |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 32 | #include <poll.h> |
| 33 | #include <pthread.h> |
| 34 | #include <string.h> |
| 35 | #include <sys/epoll.h> |
| 36 | #include <sys/socket.h> |
| 37 | #include <unistd.h> |
| 38 | |
| 39 | #include <grpc/support/alloc.h> |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 40 | #include <grpc/support/cpu.h> |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 41 | #include <grpc/support/string_util.h> |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 42 | #include <grpc/support/useful.h> |
| 43 | |
Craig Tiller | b4bb1cd | 2017-07-20 14:18:17 -0700 | [diff] [blame] | 44 | #include "src/core/lib/debug/stats.h" |
Mark D. Roth | dbdf495 | 2018-01-18 11:21:12 -0800 | [diff] [blame] | 45 | #include "src/core/lib/gpr/string.h" |
Vijay Pai | b6cf123 | 2018-01-25 21:02:26 -0800 | [diff] [blame^] | 46 | #include "src/core/lib/gpr/tls.h" |
Mark D. Roth | 4f2b0fd | 2018-01-19 12:12:23 -0800 | [diff] [blame] | 47 | #include "src/core/lib/gprpp/manual_constructor.h" |
Craig Tiller | 6b7c1fb | 2017-07-19 15:45:03 -0700 | [diff] [blame] | 48 | #include "src/core/lib/iomgr/block_annotate.h" |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 49 | #include "src/core/lib/iomgr/ev_posix.h" |
| 50 | #include "src/core/lib/iomgr/iomgr_internal.h" |
| 51 | #include "src/core/lib/iomgr/lockfree_event.h" |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 52 | #include "src/core/lib/iomgr/wakeup_fd_posix.h" |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 53 | #include "src/core/lib/profiling/timers.h" |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 54 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 55 | static grpc_wakeup_fd global_wakeup_fd; |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 56 | |
| 57 | /******************************************************************************* |
| 58 | * Singleton epoll set related fields |
| 59 | */ |
| 60 | |
| 61 | #define MAX_EPOLL_EVENTS 100 |
Sree Kuchibhotla | 1961452 | 2017-08-25 17:10:10 -0700 | [diff] [blame] | 62 | #define MAX_EPOLL_EVENTS_HANDLED_PER_ITERATION 1 |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 63 | |
Sree Kuchibhotla | e01940f | 2017-08-27 18:10:12 -0700 | [diff] [blame] | 64 | /* NOTE ON SYNCHRONIZATION: |
| 65 | * - Fields in this struct are only modified by the designated poller. Hence |
| 66 | * there is no need for any locks to protect the struct. |
| 67 | * - num_events and cursor fields have to be of atomic type to provide memory |
| 68 | * visibility guarantees only. i.e In case of multiple pollers, the designated |
| 69 | * polling thread keeps changing; the thread that wrote these values may be |
| 70 | * different from the thread reading the values |
| 71 | */ |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 72 | typedef struct epoll_set { |
| 73 | int epfd; |
| 74 | |
| 75 | /* The epoll_events after the last call to epoll_wait() */ |
| 76 | struct epoll_event events[MAX_EPOLL_EVENTS]; |
| 77 | |
| 78 | /* The number of epoll_events after the last call to epoll_wait() */ |
Sree Kuchibhotla | a92a9cc | 2017-08-27 14:02:15 -0700 | [diff] [blame] | 79 | gpr_atm num_events; |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 80 | |
| 81 | /* Index of the first event in epoll_events that has to be processed. This |
| 82 | * field is only valid if num_events > 0 */ |
Sree Kuchibhotla | a92a9cc | 2017-08-27 14:02:15 -0700 | [diff] [blame] | 83 | gpr_atm cursor; |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 84 | } epoll_set; |
| 85 | |
| 86 | /* The global singleton epoll set */ |
| 87 | static epoll_set g_epoll_set; |
| 88 | |
Mehrdad Afshari | 8b0e9fb | 2018-01-17 13:42:26 -0800 | [diff] [blame] | 89 | static int epoll_create_and_cloexec() { |
Mehrdad Afshari | 1957fd0 | 2018-01-16 17:22:01 -0800 | [diff] [blame] | 90 | #ifdef GRPC_LINUX_EPOLL_CREATE1 |
| 91 | int fd = epoll_create1(EPOLL_CLOEXEC); |
Mehrdad Afshari | 8b0e9fb | 2018-01-17 13:42:26 -0800 | [diff] [blame] | 92 | if (fd < 0) { |
| 93 | gpr_log(GPR_ERROR, "epoll_create1 unavailable"); |
Mehrdad Afshari | 1957fd0 | 2018-01-16 17:22:01 -0800 | [diff] [blame] | 94 | } |
Mehrdad Afshari | 1957fd0 | 2018-01-16 17:22:01 -0800 | [diff] [blame] | 95 | #else |
| 96 | int fd = epoll_create(MAX_EPOLL_EVENTS); |
| 97 | if (fd < 0) { |
| 98 | gpr_log(GPR_ERROR, "epoll_create unavailable"); |
Mehrdad Afshari | 8b0e9fb | 2018-01-17 13:42:26 -0800 | [diff] [blame] | 99 | } else if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0) { |
| 100 | gpr_log(GPR_ERROR, "fcntl following epoll_create failed"); |
Mehrdad Afshari | 1957fd0 | 2018-01-16 17:22:01 -0800 | [diff] [blame] | 101 | return -1; |
| 102 | } |
Mehrdad Afshari | 1957fd0 | 2018-01-16 17:22:01 -0800 | [diff] [blame] | 103 | #endif |
Mehrdad Afshari | 8b0e9fb | 2018-01-17 13:42:26 -0800 | [diff] [blame] | 104 | return fd; |
Mehrdad Afshari | 1957fd0 | 2018-01-16 17:22:01 -0800 | [diff] [blame] | 105 | } |
| 106 | |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 107 | /* Must be called *only* once */ |
| 108 | static bool epoll_set_init() { |
Mehrdad Afshari | 8b0e9fb | 2018-01-17 13:42:26 -0800 | [diff] [blame] | 109 | g_epoll_set.epfd = epoll_create_and_cloexec(); |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 110 | if (g_epoll_set.epfd < 0) { |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 111 | return false; |
| 112 | } |
| 113 | |
Sree Kuchibhotla | a92a9cc | 2017-08-27 14:02:15 -0700 | [diff] [blame] | 114 | gpr_log(GPR_INFO, "grpc epoll fd: %d", g_epoll_set.epfd); |
| 115 | gpr_atm_no_barrier_store(&g_epoll_set.num_events, 0); |
| 116 | gpr_atm_no_barrier_store(&g_epoll_set.cursor, 0); |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 117 | return true; |
| 118 | } |
| 119 | |
| 120 | /* epoll_set_init() MUST be called before calling this. */ |
| 121 | static void epoll_set_shutdown() { |
| 122 | if (g_epoll_set.epfd >= 0) { |
| 123 | close(g_epoll_set.epfd); |
| 124 | g_epoll_set.epfd = -1; |
| 125 | } |
| 126 | } |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 127 | |
| 128 | /******************************************************************************* |
| 129 | * Fd Declarations |
| 130 | */ |
| 131 | |
| 132 | struct grpc_fd { |
| 133 | int fd; |
| 134 | |
Craig Tiller | fbf61bb | 2017-11-08 11:50:14 -0800 | [diff] [blame] | 135 | grpc_core::ManualConstructor<grpc_core::LockfreeEvent> read_closure; |
| 136 | grpc_core::ManualConstructor<grpc_core::LockfreeEvent> write_closure; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 137 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 138 | struct grpc_fd* freelist_next; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 139 | |
| 140 | /* The pollset that last noticed that the fd is readable. The actual type |
| 141 | * stored in this is (grpc_pollset *) */ |
| 142 | gpr_atm read_notifier_pollset; |
| 143 | |
| 144 | grpc_iomgr_object iomgr_object; |
| 145 | }; |
| 146 | |
| 147 | static void fd_global_init(void); |
| 148 | static void fd_global_shutdown(void); |
| 149 | |
| 150 | /******************************************************************************* |
| 151 | * Pollset Declarations |
| 152 | */ |
| 153 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 154 | typedef enum { UNKICKED, KICKED, DESIGNATED_POLLER } kick_state; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 155 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 156 | static const char* kick_state_string(kick_state st) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 157 | switch (st) { |
| 158 | case UNKICKED: |
| 159 | return "UNKICKED"; |
| 160 | case KICKED: |
| 161 | return "KICKED"; |
| 162 | case DESIGNATED_POLLER: |
| 163 | return "DESIGNATED_POLLER"; |
| 164 | } |
| 165 | GPR_UNREACHABLE_CODE(return "UNKNOWN"); |
| 166 | } |
| 167 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 168 | struct grpc_pollset_worker { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 169 | kick_state state; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 170 | int kick_state_mutator; // which line of code last changed kick state |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 171 | bool initialized_cv; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 172 | grpc_pollset_worker* next; |
| 173 | grpc_pollset_worker* prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 174 | gpr_cv cv; |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 175 | grpc_closure_list schedule_on_end_work; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 176 | }; |
| 177 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 178 | #define SET_KICK_STATE(worker, kick_state) \ |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 179 | do { \ |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 180 | (worker)->state = (kick_state); \ |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 181 | (worker)->kick_state_mutator = __LINE__; \ |
| 182 | } while (false) |
| 183 | |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 184 | #define MAX_NEIGHBORHOODS 1024 |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 185 | |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 186 | typedef struct pollset_neighborhood { |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 187 | gpr_mu mu; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 188 | grpc_pollset* active_root; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 189 | char pad[GPR_CACHELINE_SIZE]; |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 190 | } pollset_neighborhood; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 191 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 192 | struct grpc_pollset { |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 193 | gpr_mu mu; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 194 | pollset_neighborhood* neighborhood; |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 195 | bool reassigning_neighborhood; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 196 | grpc_pollset_worker* root_worker; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 197 | bool kicked_without_poller; |
Sree Kuchibhotla | 0d8431a | 2017-07-18 16:21:54 -0700 | [diff] [blame] | 198 | |
| 199 | /* Set to true if the pollset is observed to have no workers available to |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 200 | poll */ |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 201 | bool seen_inactive; |
Sree Kuchibhotla | 0d8431a | 2017-07-18 16:21:54 -0700 | [diff] [blame] | 202 | bool shutting_down; /* Is the pollset shutting down ? */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 203 | grpc_closure* shutdown_closure; /* Called after after shutdown is complete */ |
Sree Kuchibhotla | 0d8431a | 2017-07-18 16:21:54 -0700 | [diff] [blame] | 204 | |
| 205 | /* Number of workers who are *about-to* attach themselves to the pollset |
| 206 | * worker list */ |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 207 | int begin_refs; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 208 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 209 | grpc_pollset* next; |
| 210 | grpc_pollset* prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 211 | }; |
| 212 | |
| 213 | /******************************************************************************* |
| 214 | * Pollset-set Declarations |
| 215 | */ |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 216 | |
Craig Tiller | 61f96c1 | 2017-05-12 13:36:39 -0700 | [diff] [blame] | 217 | struct grpc_pollset_set { |
| 218 | char unused; |
| 219 | }; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 220 | |
| 221 | /******************************************************************************* |
| 222 | * Common helpers |
| 223 | */ |
| 224 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 225 | static bool append_error(grpc_error** composite, grpc_error* error, |
| 226 | const char* desc) { |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 227 | if (error == GRPC_ERROR_NONE) return true; |
| 228 | if (*composite == GRPC_ERROR_NONE) { |
| 229 | *composite = GRPC_ERROR_CREATE_FROM_COPIED_STRING(desc); |
| 230 | } |
| 231 | *composite = grpc_error_add_child(*composite, error); |
| 232 | return false; |
| 233 | } |
| 234 | |
| 235 | /******************************************************************************* |
| 236 | * Fd Definitions |
| 237 | */ |
| 238 | |
| 239 | /* We need to keep a freelist not because of any concerns of malloc performance |
| 240 | * but instead so that implementations with multiple threads in (for example) |
| 241 | * epoll_wait deal with the race between pollset removal and incoming poll |
| 242 | * notifications. |
| 243 | * |
| 244 | * The problem is that the poller ultimately holds a reference to this |
| 245 | * object, so it is very difficult to know when is safe to free it, at least |
| 246 | * without some expensive synchronization. |
| 247 | * |
| 248 | * If we keep the object freelisted, in the worst case losing this race just |
| 249 | * becomes a spurious read notification on a reused fd. |
| 250 | */ |
| 251 | |
| 252 | /* The alarm system needs to be able to wakeup 'some poller' sometimes |
| 253 | * (specifically when a new alarm needs to be triggered earlier than the next |
| 254 | * alarm 'epoch'). This wakeup_fd gives us something to alert on when such a |
| 255 | * case occurs. */ |
| 256 | |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 257 | static grpc_fd* fd_freelist = nullptr; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 258 | static gpr_mu fd_freelist_mu; |
| 259 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 260 | static void fd_global_init(void) { gpr_mu_init(&fd_freelist_mu); } |
| 261 | |
| 262 | static void fd_global_shutdown(void) { |
| 263 | gpr_mu_lock(&fd_freelist_mu); |
| 264 | gpr_mu_unlock(&fd_freelist_mu); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 265 | while (fd_freelist != nullptr) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 266 | grpc_fd* fd = fd_freelist; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 267 | fd_freelist = fd_freelist->freelist_next; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 268 | gpr_free(fd); |
| 269 | } |
| 270 | gpr_mu_destroy(&fd_freelist_mu); |
| 271 | } |
| 272 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 273 | static grpc_fd* fd_create(int fd, const char* name) { |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 274 | grpc_fd* new_fd = nullptr; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 275 | |
| 276 | gpr_mu_lock(&fd_freelist_mu); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 277 | if (fd_freelist != nullptr) { |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 278 | new_fd = fd_freelist; |
| 279 | fd_freelist = fd_freelist->freelist_next; |
| 280 | } |
| 281 | gpr_mu_unlock(&fd_freelist_mu); |
| 282 | |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 283 | if (new_fd == nullptr) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 284 | new_fd = (grpc_fd*)gpr_malloc(sizeof(grpc_fd)); |
yang-g | 26521b3 | 2017-11-17 17:15:37 -0800 | [diff] [blame] | 285 | new_fd->read_closure.Init(); |
| 286 | new_fd->write_closure.Init(); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 287 | } |
| 288 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 289 | new_fd->fd = fd; |
yang-g | ed49fe5 | 2017-11-20 13:49:54 -0800 | [diff] [blame] | 290 | new_fd->read_closure->InitEvent(); |
| 291 | new_fd->write_closure->InitEvent(); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 292 | gpr_atm_no_barrier_store(&new_fd->read_notifier_pollset, (gpr_atm)NULL); |
| 293 | |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 294 | new_fd->freelist_next = nullptr; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 295 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 296 | char* fd_name; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 297 | gpr_asprintf(&fd_name, "%s fd=%d", name, fd); |
| 298 | grpc_iomgr_register_object(&new_fd->iomgr_object, fd_name); |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 299 | #ifndef NDEBUG |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 300 | if (grpc_trace_fd_refcount.enabled()) { |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 301 | gpr_log(GPR_DEBUG, "FD %d %p create %s", fd, new_fd, fd_name); |
| 302 | } |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 303 | #endif |
| 304 | gpr_free(fd_name); |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 305 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 306 | struct epoll_event ev; |
| 307 | ev.events = (uint32_t)(EPOLLIN | EPOLLOUT | EPOLLET); |
| 308 | ev.data.ptr = new_fd; |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 309 | if (epoll_ctl(g_epoll_set.epfd, EPOLL_CTL_ADD, fd, &ev) != 0) { |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 310 | gpr_log(GPR_ERROR, "epoll_ctl failed: %s", strerror(errno)); |
| 311 | } |
| 312 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 313 | return new_fd; |
| 314 | } |
| 315 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 316 | static int fd_wrapped_fd(grpc_fd* fd) { return fd->fd; } |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 317 | |
Sree Kuchibhotla | f264147 | 2017-08-02 23:46:40 -0700 | [diff] [blame] | 318 | /* if 'releasing_fd' is true, it means that we are going to detach the internal |
| 319 | * fd from grpc_fd structure (i.e which means we should not be calling |
| 320 | * shutdown() syscall on that fd) */ |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 321 | static void fd_shutdown_internal(grpc_fd* fd, grpc_error* why, |
| 322 | bool releasing_fd) { |
| 323 | if (fd->read_closure->SetShutdown(GRPC_ERROR_REF(why))) { |
Sree Kuchibhotla | f264147 | 2017-08-02 23:46:40 -0700 | [diff] [blame] | 324 | if (!releasing_fd) { |
| 325 | shutdown(fd->fd, SHUT_RDWR); |
| 326 | } |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 327 | fd->write_closure->SetShutdown(GRPC_ERROR_REF(why)); |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 328 | } |
| 329 | GRPC_ERROR_UNREF(why); |
| 330 | } |
| 331 | |
Sree Kuchibhotla | f264147 | 2017-08-02 23:46:40 -0700 | [diff] [blame] | 332 | /* Might be called multiple times */ |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 333 | static void fd_shutdown(grpc_fd* fd, grpc_error* why) { |
| 334 | fd_shutdown_internal(fd, why, false); |
Sree Kuchibhotla | f264147 | 2017-08-02 23:46:40 -0700 | [diff] [blame] | 335 | } |
| 336 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 337 | static void fd_orphan(grpc_fd* fd, grpc_closure* on_done, int* release_fd, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 338 | bool already_closed, const char* reason) { |
| 339 | grpc_error* error = GRPC_ERROR_NONE; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 340 | bool is_release_fd = (release_fd != nullptr); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 341 | |
Craig Tiller | fbf61bb | 2017-11-08 11:50:14 -0800 | [diff] [blame] | 342 | if (!fd->read_closure->IsShutdown()) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 343 | fd_shutdown_internal(fd, GRPC_ERROR_CREATE_FROM_COPIED_STRING(reason), |
Sree Kuchibhotla | f264147 | 2017-08-02 23:46:40 -0700 | [diff] [blame] | 344 | is_release_fd); |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 345 | } |
| 346 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 347 | /* If release_fd is not NULL, we should be relinquishing control of the file |
| 348 | descriptor fd->fd (but we still own the grpc_fd structure). */ |
Sree Kuchibhotla | f264147 | 2017-08-02 23:46:40 -0700 | [diff] [blame] | 349 | if (is_release_fd) { |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 350 | *release_fd = fd->fd; |
Yuchen Zeng | d40a7ae | 2017-07-12 15:59:56 -0700 | [diff] [blame] | 351 | } else if (!already_closed) { |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 352 | close(fd->fd); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 353 | } |
| 354 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 355 | GRPC_CLOSURE_SCHED(on_done, GRPC_ERROR_REF(error)); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 356 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 357 | grpc_iomgr_unregister_object(&fd->iomgr_object); |
yang-g | ed49fe5 | 2017-11-20 13:49:54 -0800 | [diff] [blame] | 358 | fd->read_closure->DestroyEvent(); |
| 359 | fd->write_closure->DestroyEvent(); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 360 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 361 | gpr_mu_lock(&fd_freelist_mu); |
| 362 | fd->freelist_next = fd_freelist; |
| 363 | fd_freelist = fd; |
| 364 | gpr_mu_unlock(&fd_freelist_mu); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 365 | } |
| 366 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 367 | static grpc_pollset* fd_get_read_notifier_pollset(grpc_fd* fd) { |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 368 | gpr_atm notifier = gpr_atm_acq_load(&fd->read_notifier_pollset); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 369 | return (grpc_pollset*)notifier; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 370 | } |
| 371 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 372 | static bool fd_is_shutdown(grpc_fd* fd) { |
Craig Tiller | fbf61bb | 2017-11-08 11:50:14 -0800 | [diff] [blame] | 373 | return fd->read_closure->IsShutdown(); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 374 | } |
| 375 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 376 | static void fd_notify_on_read(grpc_fd* fd, grpc_closure* closure) { |
| 377 | fd->read_closure->NotifyOn(closure); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 378 | } |
| 379 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 380 | static void fd_notify_on_write(grpc_fd* fd, grpc_closure* closure) { |
| 381 | fd->write_closure->NotifyOn(closure); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 382 | } |
| 383 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 384 | static void fd_become_readable(grpc_fd* fd, grpc_pollset* notifier) { |
| 385 | fd->read_closure->SetReady(); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 386 | /* Use release store to match with acquire load in fd_get_read_notifier */ |
| 387 | gpr_atm_rel_store(&fd->read_notifier_pollset, (gpr_atm)notifier); |
| 388 | } |
| 389 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 390 | static void fd_become_writable(grpc_fd* fd) { fd->write_closure->SetReady(); } |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 391 | |
| 392 | /******************************************************************************* |
| 393 | * Pollset Definitions |
| 394 | */ |
| 395 | |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 396 | GPR_TLS_DECL(g_current_thread_pollset); |
| 397 | GPR_TLS_DECL(g_current_thread_worker); |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 398 | |
| 399 | /* The designated poller */ |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 400 | static gpr_atm g_active_poller; |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 401 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 402 | static pollset_neighborhood* g_neighborhoods; |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 403 | static size_t g_num_neighborhoods; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 404 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 405 | /* Return true if first in list */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 406 | static bool worker_insert(grpc_pollset* pollset, grpc_pollset_worker* worker) { |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 407 | if (pollset->root_worker == nullptr) { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 408 | pollset->root_worker = worker; |
| 409 | worker->next = worker->prev = worker; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 410 | return true; |
| 411 | } else { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 412 | worker->next = pollset->root_worker; |
| 413 | worker->prev = worker->next->prev; |
| 414 | worker->next->prev = worker; |
| 415 | worker->prev->next = worker; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 416 | return false; |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | /* Return true if last in list */ |
| 421 | typedef enum { EMPTIED, NEW_ROOT, REMOVED } worker_remove_result; |
| 422 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 423 | static worker_remove_result worker_remove(grpc_pollset* pollset, |
| 424 | grpc_pollset_worker* worker) { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 425 | if (worker == pollset->root_worker) { |
| 426 | if (worker == worker->next) { |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 427 | pollset->root_worker = nullptr; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 428 | return EMPTIED; |
| 429 | } else { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 430 | pollset->root_worker = worker->next; |
| 431 | worker->prev->next = worker->next; |
| 432 | worker->next->prev = worker->prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 433 | return NEW_ROOT; |
| 434 | } |
| 435 | } else { |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 436 | worker->prev->next = worker->next; |
| 437 | worker->next->prev = worker->prev; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 438 | return REMOVED; |
| 439 | } |
| 440 | } |
| 441 | |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 442 | static size_t choose_neighborhood(void) { |
| 443 | return (size_t)gpr_cpu_current_cpu() % g_num_neighborhoods; |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 444 | } |
| 445 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 446 | static grpc_error* pollset_global_init(void) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 447 | gpr_tls_init(&g_current_thread_pollset); |
| 448 | gpr_tls_init(&g_current_thread_worker); |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 449 | gpr_atm_no_barrier_store(&g_active_poller, 0); |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 450 | global_wakeup_fd.read_fd = -1; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 451 | grpc_error* err = grpc_wakeup_fd_init(&global_wakeup_fd); |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 452 | if (err != GRPC_ERROR_NONE) return err; |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 453 | struct epoll_event ev; |
| 454 | ev.events = (uint32_t)(EPOLLIN | EPOLLET); |
| 455 | ev.data.ptr = &global_wakeup_fd; |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 456 | if (epoll_ctl(g_epoll_set.epfd, EPOLL_CTL_ADD, global_wakeup_fd.read_fd, |
| 457 | &ev) != 0) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 458 | return GRPC_OS_ERROR(errno, "epoll_ctl"); |
| 459 | } |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 460 | g_num_neighborhoods = GPR_CLAMP(gpr_cpu_num_cores(), 1, MAX_NEIGHBORHOODS); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 461 | g_neighborhoods = (pollset_neighborhood*)gpr_zalloc(sizeof(*g_neighborhoods) * |
| 462 | g_num_neighborhoods); |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 463 | for (size_t i = 0; i < g_num_neighborhoods; i++) { |
| 464 | gpr_mu_init(&g_neighborhoods[i].mu); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 465 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 466 | return GRPC_ERROR_NONE; |
| 467 | } |
| 468 | |
| 469 | static void pollset_global_shutdown(void) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 470 | gpr_tls_destroy(&g_current_thread_pollset); |
| 471 | gpr_tls_destroy(&g_current_thread_worker); |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 472 | if (global_wakeup_fd.read_fd != -1) grpc_wakeup_fd_destroy(&global_wakeup_fd); |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 473 | for (size_t i = 0; i < g_num_neighborhoods; i++) { |
| 474 | gpr_mu_destroy(&g_neighborhoods[i].mu); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 475 | } |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 476 | gpr_free(g_neighborhoods); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 477 | } |
| 478 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 479 | static void pollset_init(grpc_pollset* pollset, gpr_mu** mu) { |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 480 | gpr_mu_init(&pollset->mu); |
| 481 | *mu = &pollset->mu; |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 482 | pollset->neighborhood = &g_neighborhoods[choose_neighborhood()]; |
| 483 | pollset->reassigning_neighborhood = false; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 484 | pollset->root_worker = nullptr; |
Sree Kuchibhotla | 3088230 | 2017-08-16 13:46:52 -0700 | [diff] [blame] | 485 | pollset->kicked_without_poller = false; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 486 | pollset->seen_inactive = true; |
Sree Kuchibhotla | 3088230 | 2017-08-16 13:46:52 -0700 | [diff] [blame] | 487 | pollset->shutting_down = false; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 488 | pollset->shutdown_closure = nullptr; |
Sree Kuchibhotla | 3088230 | 2017-08-16 13:46:52 -0700 | [diff] [blame] | 489 | pollset->begin_refs = 0; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 490 | pollset->next = pollset->prev = nullptr; |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 491 | } |
| 492 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 493 | static void pollset_destroy(grpc_pollset* pollset) { |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 494 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 495 | if (!pollset->seen_inactive) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 496 | pollset_neighborhood* neighborhood = pollset->neighborhood; |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 497 | gpr_mu_unlock(&pollset->mu); |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 498 | retry_lock_neighborhood: |
| 499 | gpr_mu_lock(&neighborhood->mu); |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 500 | gpr_mu_lock(&pollset->mu); |
| 501 | if (!pollset->seen_inactive) { |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 502 | if (pollset->neighborhood != neighborhood) { |
| 503 | gpr_mu_unlock(&neighborhood->mu); |
| 504 | neighborhood = pollset->neighborhood; |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 505 | gpr_mu_unlock(&pollset->mu); |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 506 | goto retry_lock_neighborhood; |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 507 | } |
| 508 | pollset->prev->next = pollset->next; |
| 509 | pollset->next->prev = pollset->prev; |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 510 | if (pollset == pollset->neighborhood->active_root) { |
| 511 | pollset->neighborhood->active_root = |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 512 | pollset->next == pollset ? nullptr : pollset->next; |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 513 | } |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 514 | } |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 515 | gpr_mu_unlock(&pollset->neighborhood->mu); |
Craig Tiller | 6de0593 | 2017-04-28 09:17:38 -0700 | [diff] [blame] | 516 | } |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 517 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 518 | gpr_mu_destroy(&pollset->mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 519 | } |
| 520 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 521 | static grpc_error* pollset_kick_all(grpc_pollset* pollset) { |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 522 | GPR_TIMER_BEGIN("pollset_kick_all", 0); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 523 | grpc_error* error = GRPC_ERROR_NONE; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 524 | if (pollset->root_worker != nullptr) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 525 | grpc_pollset_worker* worker = pollset->root_worker; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 526 | do { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 527 | GRPC_STATS_INC_POLLSET_KICK(); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 528 | switch (worker->state) { |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 529 | case KICKED: |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 530 | GRPC_STATS_INC_POLLSET_KICKED_AGAIN(); |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 531 | break; |
| 532 | case UNKICKED: |
| 533 | SET_KICK_STATE(worker, KICKED); |
| 534 | if (worker->initialized_cv) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 535 | GRPC_STATS_INC_POLLSET_KICK_WAKEUP_CV(); |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 536 | gpr_cv_signal(&worker->cv); |
| 537 | } |
| 538 | break; |
| 539 | case DESIGNATED_POLLER: |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 540 | GRPC_STATS_INC_POLLSET_KICK_WAKEUP_FD(); |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 541 | SET_KICK_STATE(worker, KICKED); |
| 542 | append_error(&error, grpc_wakeup_fd_wakeup(&global_wakeup_fd), |
Sree Kuchibhotla | 0d8431a | 2017-07-18 16:21:54 -0700 | [diff] [blame] | 543 | "pollset_kick_all"); |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 544 | break; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 545 | } |
| 546 | |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 547 | worker = worker->next; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 548 | } while (worker != pollset->root_worker); |
| 549 | } |
Sree Kuchibhotla | 0d8431a | 2017-07-18 16:21:54 -0700 | [diff] [blame] | 550 | // TODO: sreek. Check if we need to set 'kicked_without_poller' to true here |
| 551 | // in the else case |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 552 | GPR_TIMER_END("pollset_kick_all", 0); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 553 | return error; |
| 554 | } |
| 555 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 556 | static void pollset_maybe_finish_shutdown(grpc_pollset* pollset) { |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 557 | if (pollset->shutdown_closure != nullptr && pollset->root_worker == nullptr && |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 558 | pollset->begin_refs == 0) { |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 559 | GPR_TIMER_MARK("pollset_finish_shutdown", 0); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 560 | GRPC_CLOSURE_SCHED(pollset->shutdown_closure, GRPC_ERROR_NONE); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 561 | pollset->shutdown_closure = nullptr; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 562 | } |
| 563 | } |
| 564 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 565 | static void pollset_shutdown(grpc_pollset* pollset, grpc_closure* closure) { |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 566 | GPR_TIMER_BEGIN("pollset_shutdown", 0); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 567 | GPR_ASSERT(pollset->shutdown_closure == nullptr); |
Craig Tiller | c81512a | 2017-05-26 09:53:58 -0700 | [diff] [blame] | 568 | GPR_ASSERT(!pollset->shutting_down); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 569 | pollset->shutdown_closure = closure; |
Craig Tiller | c81512a | 2017-05-26 09:53:58 -0700 | [diff] [blame] | 570 | pollset->shutting_down = true; |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 571 | GRPC_LOG_IF_ERROR("pollset_shutdown", pollset_kick_all(pollset)); |
| 572 | pollset_maybe_finish_shutdown(pollset); |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 573 | GPR_TIMER_END("pollset_shutdown", 0); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 574 | } |
| 575 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 576 | static int poll_deadline_to_millis_timeout(grpc_millis millis) { |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 577 | if (millis == GRPC_MILLIS_INF_FUTURE) return -1; |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 578 | grpc_millis delta = millis - grpc_core::ExecCtx::Get()->Now(); |
Craig Tiller | d9b82bd | 2017-08-29 12:16:56 -0700 | [diff] [blame] | 579 | if (delta > INT_MAX) { |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 580 | return INT_MAX; |
Craig Tiller | d9b82bd | 2017-08-29 12:16:56 -0700 | [diff] [blame] | 581 | } else if (delta < 0) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 582 | return 0; |
Craig Tiller | d9b82bd | 2017-08-29 12:16:56 -0700 | [diff] [blame] | 583 | } else { |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 584 | return (int)delta; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 585 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 586 | } |
| 587 | |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 588 | /* Process the epoll events found by do_epoll_wait() function. |
| 589 | - g_epoll_set.cursor points to the index of the first event to be processed |
| 590 | - This function then processes up-to MAX_EPOLL_EVENTS_PER_ITERATION and |
| 591 | updates the g_epoll_set.cursor |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 592 | |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 593 | NOTE ON SYNCRHONIZATION: Similar to do_epoll_wait(), this function is only |
| 594 | called by g_active_poller thread. So there is no need for synchronization |
| 595 | when accessing fields in g_epoll_set */ |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 596 | static grpc_error* process_epoll_events(grpc_pollset* pollset) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 597 | static const char* err_desc = "process_events"; |
| 598 | grpc_error* error = GRPC_ERROR_NONE; |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 599 | |
Sree Kuchibhotla | 3d609f1 | 2017-08-25 10:00:18 -0700 | [diff] [blame] | 600 | GPR_TIMER_BEGIN("process_epoll_events", 0); |
Sree Kuchibhotla | a92a9cc | 2017-08-27 14:02:15 -0700 | [diff] [blame] | 601 | long num_events = gpr_atm_acq_load(&g_epoll_set.num_events); |
| 602 | long cursor = gpr_atm_acq_load(&g_epoll_set.cursor); |
| 603 | for (int idx = 0; |
| 604 | (idx < MAX_EPOLL_EVENTS_HANDLED_PER_ITERATION) && cursor != num_events; |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 605 | idx++) { |
Sree Kuchibhotla | a92a9cc | 2017-08-27 14:02:15 -0700 | [diff] [blame] | 606 | long c = cursor++; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 607 | struct epoll_event* ev = &g_epoll_set.events[c]; |
| 608 | void* data_ptr = ev->data.ptr; |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 609 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 610 | if (data_ptr == &global_wakeup_fd) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 611 | append_error(&error, grpc_wakeup_fd_consume_wakeup(&global_wakeup_fd), |
| 612 | err_desc); |
| 613 | } else { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 614 | grpc_fd* fd = (grpc_fd*)(data_ptr); |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 615 | bool cancel = (ev->events & (EPOLLERR | EPOLLHUP)) != 0; |
| 616 | bool read_ev = (ev->events & (EPOLLIN | EPOLLPRI)) != 0; |
| 617 | bool write_ev = (ev->events & EPOLLOUT) != 0; |
| 618 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 619 | if (read_ev || cancel) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 620 | fd_become_readable(fd, pollset); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 621 | } |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 622 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 623 | if (write_ev || cancel) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 624 | fd_become_writable(fd); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 625 | } |
| 626 | } |
| 627 | } |
Sree Kuchibhotla | a92a9cc | 2017-08-27 14:02:15 -0700 | [diff] [blame] | 628 | gpr_atm_rel_store(&g_epoll_set.cursor, cursor); |
Sree Kuchibhotla | 3d609f1 | 2017-08-25 10:00:18 -0700 | [diff] [blame] | 629 | GPR_TIMER_END("process_epoll_events", 0); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 630 | return error; |
| 631 | } |
| 632 | |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 633 | /* Do epoll_wait and store the events in g_epoll_set.events field. This does not |
| 634 | "process" any of the events yet; that is done in process_epoll_events(). |
| 635 | *See process_epoll_events() function for more details. |
| 636 | |
| 637 | NOTE ON SYNCHRONIZATION: At any point of time, only the g_active_poller |
| 638 | (i.e the designated poller thread) will be calling this function. So there is |
| 639 | no need for any synchronization when accesing fields in g_epoll_set */ |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 640 | static grpc_error* do_epoll_wait(grpc_pollset* ps, grpc_millis deadline) { |
Sree Kuchibhotla | 3d609f1 | 2017-08-25 10:00:18 -0700 | [diff] [blame] | 641 | GPR_TIMER_BEGIN("do_epoll_wait", 0); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 642 | |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 643 | int r; |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 644 | int timeout = poll_deadline_to_millis_timeout(deadline); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 645 | if (timeout != 0) { |
| 646 | GRPC_SCHEDULING_START_BLOCKING_REGION; |
| 647 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 648 | do { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 649 | GRPC_STATS_INC_SYSCALL_POLL(); |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 650 | r = epoll_wait(g_epoll_set.epfd, g_epoll_set.events, MAX_EPOLL_EVENTS, |
| 651 | timeout); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 652 | } while (r < 0 && errno == EINTR); |
| 653 | if (timeout != 0) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 654 | GRPC_SCHEDULING_END_BLOCKING_REGION; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 655 | } |
| 656 | |
| 657 | if (r < 0) return GRPC_OS_ERROR(errno, "epoll_wait"); |
| 658 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 659 | GRPC_STATS_INC_POLL_EVENTS_RETURNED(r); |
Craig Tiller | 0ff222a | 2017-09-01 09:41:43 -0700 | [diff] [blame] | 660 | |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 661 | if (grpc_polling_trace.enabled()) { |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 662 | gpr_log(GPR_DEBUG, "ps: %p poll got %d events", ps, r); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 663 | } |
| 664 | |
Sree Kuchibhotla | a92a9cc | 2017-08-27 14:02:15 -0700 | [diff] [blame] | 665 | gpr_atm_rel_store(&g_epoll_set.num_events, r); |
| 666 | gpr_atm_rel_store(&g_epoll_set.cursor, 0); |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 667 | |
Sree Kuchibhotla | 3d609f1 | 2017-08-25 10:00:18 -0700 | [diff] [blame] | 668 | GPR_TIMER_END("do_epoll_wait", 0); |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 669 | return GRPC_ERROR_NONE; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 670 | } |
| 671 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 672 | static bool begin_worker(grpc_pollset* pollset, grpc_pollset_worker* worker, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 673 | grpc_pollset_worker** worker_hdl, |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 674 | grpc_millis deadline) { |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 675 | GPR_TIMER_BEGIN("begin_worker", 0); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 676 | if (worker_hdl != nullptr) *worker_hdl = worker; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 677 | worker->initialized_cv = false; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 678 | SET_KICK_STATE(worker, UNKICKED); |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 679 | worker->schedule_on_end_work = (grpc_closure_list)GRPC_CLOSURE_LIST_INIT; |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 680 | pollset->begin_refs++; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 681 | |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 682 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 683 | gpr_log(GPR_DEBUG, "PS:%p BEGIN_STARTS:%p", pollset, worker); |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 684 | } |
| 685 | |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 686 | if (pollset->seen_inactive) { |
| 687 | // pollset has been observed to be inactive, we need to move back to the |
| 688 | // active list |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 689 | bool is_reassigning = false; |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 690 | if (!pollset->reassigning_neighborhood) { |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 691 | is_reassigning = true; |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 692 | pollset->reassigning_neighborhood = true; |
| 693 | pollset->neighborhood = &g_neighborhoods[choose_neighborhood()]; |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 694 | } |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 695 | pollset_neighborhood* neighborhood = pollset->neighborhood; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 696 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 697 | // pollset unlocked: state may change (even worker->kick_state) |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 698 | retry_lock_neighborhood: |
| 699 | gpr_mu_lock(&neighborhood->mu); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 700 | gpr_mu_lock(&pollset->mu); |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 701 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 702 | gpr_log(GPR_DEBUG, "PS:%p BEGIN_REORG:%p kick_state=%s is_reassigning=%d", |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 703 | pollset, worker, kick_state_string(worker->state), |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 704 | is_reassigning); |
| 705 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 706 | if (pollset->seen_inactive) { |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 707 | if (neighborhood != pollset->neighborhood) { |
| 708 | gpr_mu_unlock(&neighborhood->mu); |
| 709 | neighborhood = pollset->neighborhood; |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 710 | gpr_mu_unlock(&pollset->mu); |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 711 | goto retry_lock_neighborhood; |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 712 | } |
Sree Kuchibhotla | 0d8431a | 2017-07-18 16:21:54 -0700 | [diff] [blame] | 713 | |
Sree Kuchibhotla | fb34940 | 2017-09-06 10:58:06 -0700 | [diff] [blame] | 714 | /* In the brief time we released the pollset locks above, the worker MAY |
| 715 | have been kicked. In this case, the worker should get out of this |
| 716 | pollset ASAP and hence this should neither add the pollset to |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 717 | neighborhood nor mark the pollset as active. |
Sree Kuchibhotla | fb34940 | 2017-09-06 10:58:06 -0700 | [diff] [blame] | 718 | |
| 719 | On a side note, the only way a worker's kick state could have changed |
| 720 | at this point is if it were "kicked specifically". Since the worker has |
| 721 | not added itself to the pollset yet (by calling worker_insert()), it is |
| 722 | not visible in the "kick any" path yet */ |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 723 | if (worker->state == UNKICKED) { |
Sree Kuchibhotla | fb34940 | 2017-09-06 10:58:06 -0700 | [diff] [blame] | 724 | pollset->seen_inactive = false; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 725 | if (neighborhood->active_root == nullptr) { |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 726 | neighborhood->active_root = pollset->next = pollset->prev = pollset; |
Sree Kuchibhotla | fb34940 | 2017-09-06 10:58:06 -0700 | [diff] [blame] | 727 | /* Make this the designated poller if there isn't one already */ |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 728 | if (worker->state == UNKICKED && |
Sree Kuchibhotla | fb34940 | 2017-09-06 10:58:06 -0700 | [diff] [blame] | 729 | gpr_atm_no_barrier_cas(&g_active_poller, 0, (gpr_atm)worker)) { |
| 730 | SET_KICK_STATE(worker, DESIGNATED_POLLER); |
| 731 | } |
| 732 | } else { |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 733 | pollset->next = neighborhood->active_root; |
Sree Kuchibhotla | fb34940 | 2017-09-06 10:58:06 -0700 | [diff] [blame] | 734 | pollset->prev = pollset->next->prev; |
| 735 | pollset->next->prev = pollset->prev->next = pollset; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 736 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 737 | } |
| 738 | } |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 739 | if (is_reassigning) { |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 740 | GPR_ASSERT(pollset->reassigning_neighborhood); |
| 741 | pollset->reassigning_neighborhood = false; |
Craig Tiller | e00d733 | 2017-05-01 15:43:51 +0000 | [diff] [blame] | 742 | } |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 743 | gpr_mu_unlock(&neighborhood->mu); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 744 | } |
Sree Kuchibhotla | e6506bc | 2017-07-18 21:43:45 -0700 | [diff] [blame] | 745 | |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 746 | worker_insert(pollset, worker); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 747 | pollset->begin_refs--; |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 748 | if (worker->state == UNKICKED && !pollset->kicked_without_poller) { |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 749 | GPR_ASSERT(gpr_atm_no_barrier_load(&g_active_poller) != (gpr_atm)worker); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 750 | worker->initialized_cv = true; |
| 751 | gpr_cv_init(&worker->cv); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 752 | while (worker->state == UNKICKED && !pollset->shutting_down) { |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 753 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 754 | gpr_log(GPR_DEBUG, "PS:%p BEGIN_WAIT:%p kick_state=%s shutdown=%d", |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 755 | pollset, worker, kick_state_string(worker->state), |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 756 | pollset->shutting_down); |
| 757 | } |
Sree Kuchibhotla | 0d8431a | 2017-07-18 16:21:54 -0700 | [diff] [blame] | 758 | |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 759 | if (gpr_cv_wait(&worker->cv, &pollset->mu, |
Sree Kuchibhotla | 54961bb | 2017-12-04 12:50:27 -0800 | [diff] [blame] | 760 | grpc_millis_to_timespec(deadline, GPR_CLOCK_MONOTONIC)) && |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 761 | worker->state == UNKICKED) { |
Sree Kuchibhotla | 0d8431a | 2017-07-18 16:21:54 -0700 | [diff] [blame] | 762 | /* If gpr_cv_wait returns true (i.e a timeout), pretend that the worker |
| 763 | received a kick */ |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 764 | SET_KICK_STATE(worker, KICKED); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 765 | } |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 766 | } |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 767 | grpc_core::ExecCtx::Get()->InvalidateNow(); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 768 | } |
| 769 | |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 770 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 771 | gpr_log(GPR_DEBUG, |
Sree Kuchibhotla | 949d075 | 2017-07-20 23:49:15 -0700 | [diff] [blame] | 772 | "PS:%p BEGIN_DONE:%p kick_state=%s shutdown=%d " |
| 773 | "kicked_without_poller: %d", |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 774 | pollset, worker, kick_state_string(worker->state), |
Sree Kuchibhotla | 949d075 | 2017-07-20 23:49:15 -0700 | [diff] [blame] | 775 | pollset->shutting_down, pollset->kicked_without_poller); |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 776 | } |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 777 | |
Sree Kuchibhotla | e6506bc | 2017-07-18 21:43:45 -0700 | [diff] [blame] | 778 | /* We release pollset lock in this function at a couple of places: |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 779 | * 1. Briefly when assigning pollset to a neighborhood |
Sree Kuchibhotla | e6506bc | 2017-07-18 21:43:45 -0700 | [diff] [blame] | 780 | * 2. When doing gpr_cv_wait() |
| 781 | * It is possible that 'kicked_without_poller' was set to true during (1) and |
| 782 | * 'shutting_down' is set to true during (1) or (2). If either of them is |
| 783 | * true, this worker cannot do polling */ |
Sree Kuchibhotla | e6506bc | 2017-07-18 21:43:45 -0700 | [diff] [blame] | 784 | /* TODO(sreek): Perhaps there is a better way to handle kicked_without_poller |
| 785 | * case; especially when the worker is the DESIGNATED_POLLER */ |
| 786 | |
Sree Kuchibhotla | a0616ef | 2017-07-18 23:49:49 -0700 | [diff] [blame] | 787 | if (pollset->kicked_without_poller) { |
| 788 | pollset->kicked_without_poller = false; |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 789 | GPR_TIMER_END("begin_worker", 0); |
Sree Kuchibhotla | a0616ef | 2017-07-18 23:49:49 -0700 | [diff] [blame] | 790 | return false; |
| 791 | } |
| 792 | |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 793 | GPR_TIMER_END("begin_worker", 0); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 794 | return worker->state == DESIGNATED_POLLER && !pollset->shutting_down; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 795 | } |
| 796 | |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 797 | static bool check_neighborhood_for_available_poller( |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 798 | pollset_neighborhood* neighborhood) { |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 799 | GPR_TIMER_BEGIN("check_neighborhood_for_available_poller", 0); |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 800 | bool found_worker = false; |
| 801 | do { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 802 | grpc_pollset* inspect = neighborhood->active_root; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 803 | if (inspect == nullptr) { |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 804 | break; |
| 805 | } |
| 806 | gpr_mu_lock(&inspect->mu); |
| 807 | GPR_ASSERT(!inspect->seen_inactive); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 808 | grpc_pollset_worker* inspect_worker = inspect->root_worker; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 809 | if (inspect_worker != nullptr) { |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 810 | do { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 811 | switch (inspect_worker->state) { |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 812 | case UNKICKED: |
| 813 | if (gpr_atm_no_barrier_cas(&g_active_poller, 0, |
| 814 | (gpr_atm)inspect_worker)) { |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 815 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 816 | gpr_log(GPR_DEBUG, " .. choose next poller to be %p", |
| 817 | inspect_worker); |
| 818 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 819 | SET_KICK_STATE(inspect_worker, DESIGNATED_POLLER); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 820 | if (inspect_worker->initialized_cv) { |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 821 | GPR_TIMER_MARK("signal worker", 0); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 822 | GRPC_STATS_INC_POLLSET_KICK_WAKEUP_CV(); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 823 | gpr_cv_signal(&inspect_worker->cv); |
| 824 | } |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 825 | } else { |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 826 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 827 | gpr_log(GPR_DEBUG, " .. beaten to choose next poller"); |
| 828 | } |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 829 | } |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 830 | // even if we didn't win the cas, there's a worker, we can stop |
| 831 | found_worker = true; |
| 832 | break; |
| 833 | case KICKED: |
| 834 | break; |
| 835 | case DESIGNATED_POLLER: |
| 836 | found_worker = true; // ok, so someone else found the worker, but |
| 837 | // we'll accept that |
| 838 | break; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 839 | } |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 840 | inspect_worker = inspect_worker->next; |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 841 | } while (!found_worker && inspect_worker != inspect->root_worker); |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 842 | } |
| 843 | if (!found_worker) { |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 844 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 845 | gpr_log(GPR_DEBUG, " .. mark pollset %p inactive", inspect); |
| 846 | } |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 847 | inspect->seen_inactive = true; |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 848 | if (inspect == neighborhood->active_root) { |
| 849 | neighborhood->active_root = |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 850 | inspect->next == inspect ? nullptr : inspect->next; |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 851 | } |
| 852 | inspect->next->prev = inspect->prev; |
| 853 | inspect->prev->next = inspect->next; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 854 | inspect->next = inspect->prev = nullptr; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 855 | } |
| 856 | gpr_mu_unlock(&inspect->mu); |
| 857 | } while (!found_worker); |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 858 | GPR_TIMER_END("check_neighborhood_for_available_poller", 0); |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 859 | return found_worker; |
| 860 | } |
| 861 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 862 | static void end_worker(grpc_pollset* pollset, grpc_pollset_worker* worker, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 863 | grpc_pollset_worker** worker_hdl) { |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 864 | GPR_TIMER_BEGIN("end_worker", 0); |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 865 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 866 | gpr_log(GPR_DEBUG, "PS:%p END_WORKER:%p", pollset, worker); |
| 867 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 868 | if (worker_hdl != nullptr) *worker_hdl = nullptr; |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 869 | /* Make sure we appear kicked */ |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 870 | SET_KICK_STATE(worker, KICKED); |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 871 | grpc_closure_list_move(&worker->schedule_on_end_work, |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 872 | grpc_core::ExecCtx::Get()->closure_list()); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 873 | if (gpr_atm_no_barrier_load(&g_active_poller) == (gpr_atm)worker) { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 874 | if (worker->next != worker && worker->next->state == UNKICKED) { |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 875 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 876 | gpr_log(GPR_DEBUG, " .. choose next poller to be peer %p", worker); |
| 877 | } |
Craig Tiller | 2acab6e | 2017-04-30 23:06:33 +0000 | [diff] [blame] | 878 | GPR_ASSERT(worker->next->initialized_cv); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 879 | gpr_atm_no_barrier_store(&g_active_poller, (gpr_atm)worker->next); |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 880 | SET_KICK_STATE(worker->next, DESIGNATED_POLLER); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 881 | GRPC_STATS_INC_POLLSET_KICK_WAKEUP_CV(); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 882 | gpr_cv_signal(&worker->next->cv); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 883 | if (grpc_core::ExecCtx::Get()->HasWork()) { |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 884 | gpr_mu_unlock(&pollset->mu); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 885 | grpc_core::ExecCtx::Get()->Flush(); |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 886 | gpr_mu_lock(&pollset->mu); |
| 887 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 888 | } else { |
| 889 | gpr_atm_no_barrier_store(&g_active_poller, 0); |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 890 | size_t poller_neighborhood_idx = |
| 891 | (size_t)(pollset->neighborhood - g_neighborhoods); |
Craig Tiller | bb74267 | 2017-05-17 22:19:05 +0000 | [diff] [blame] | 892 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 893 | bool found_worker = false; |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 894 | bool scan_state[MAX_NEIGHBORHOODS]; |
| 895 | for (size_t i = 0; !found_worker && i < g_num_neighborhoods; i++) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 896 | pollset_neighborhood* neighborhood = |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 897 | &g_neighborhoods[(poller_neighborhood_idx + i) % |
| 898 | g_num_neighborhoods]; |
| 899 | if (gpr_mu_trylock(&neighborhood->mu)) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 900 | found_worker = check_neighborhood_for_available_poller(neighborhood); |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 901 | gpr_mu_unlock(&neighborhood->mu); |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 902 | scan_state[i] = true; |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 903 | } else { |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 904 | scan_state[i] = false; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 905 | } |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 906 | } |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 907 | for (size_t i = 0; !found_worker && i < g_num_neighborhoods; i++) { |
Craig Tiller | ba550da | 2017-05-01 14:26:31 +0000 | [diff] [blame] | 908 | if (scan_state[i]) continue; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 909 | pollset_neighborhood* neighborhood = |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 910 | &g_neighborhoods[(poller_neighborhood_idx + i) % |
| 911 | g_num_neighborhoods]; |
| 912 | gpr_mu_lock(&neighborhood->mu); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 913 | found_worker = check_neighborhood_for_available_poller(neighborhood); |
Vijay Pai | 4b7ef4d | 2017-09-11 23:09:22 -0700 | [diff] [blame] | 914 | gpr_mu_unlock(&neighborhood->mu); |
Craig Tiller | bbf4c7a | 2017-04-28 15:12:10 -0700 | [diff] [blame] | 915 | } |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 916 | grpc_core::ExecCtx::Get()->Flush(); |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 917 | gpr_mu_lock(&pollset->mu); |
| 918 | } |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 919 | } else if (grpc_core::ExecCtx::Get()->HasWork()) { |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 920 | gpr_mu_unlock(&pollset->mu); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 921 | grpc_core::ExecCtx::Get()->Flush(); |
Craig Tiller | 50da5ec | 2017-05-01 13:51:14 -0700 | [diff] [blame] | 922 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 923 | } |
| 924 | if (worker->initialized_cv) { |
| 925 | gpr_cv_destroy(&worker->cv); |
| 926 | } |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 927 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 928 | gpr_log(GPR_DEBUG, " .. remove worker"); |
| 929 | } |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 930 | if (EMPTIED == worker_remove(pollset, worker)) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 931 | pollset_maybe_finish_shutdown(pollset); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 932 | } |
Craig Tiller | a4b8eb0 | 2017-04-29 00:13:52 +0000 | [diff] [blame] | 933 | GPR_ASSERT(gpr_atm_no_barrier_load(&g_active_poller) != (gpr_atm)worker); |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 934 | GPR_TIMER_END("end_worker", 0); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 935 | } |
| 936 | |
| 937 | /* pollset->po.mu lock must be held by the caller before calling this. |
| 938 | The function pollset_work() may temporarily release the lock (pollset->po.mu) |
| 939 | during the course of its execution but it will always re-acquire the lock and |
| 940 | ensure that it is held by the time the function returns */ |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 941 | static grpc_error* pollset_work(grpc_pollset* ps, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 942 | grpc_pollset_worker** worker_hdl, |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 943 | grpc_millis deadline) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 944 | grpc_pollset_worker worker; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 945 | grpc_error* error = GRPC_ERROR_NONE; |
| 946 | static const char* err_desc = "pollset_work"; |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 947 | GPR_TIMER_BEGIN("pollset_work", 0); |
Sree Kuchibhotla | b154cd1 | 2017-08-25 10:33:41 -0700 | [diff] [blame] | 948 | if (ps->kicked_without_poller) { |
| 949 | ps->kicked_without_poller = false; |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 950 | GPR_TIMER_END("pollset_work", 0); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 951 | return GRPC_ERROR_NONE; |
| 952 | } |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 953 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 954 | if (begin_worker(ps, &worker, worker_hdl, deadline)) { |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 955 | gpr_tls_set(&g_current_thread_pollset, (intptr_t)ps); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 956 | gpr_tls_set(&g_current_thread_worker, (intptr_t)&worker); |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 957 | GPR_ASSERT(!ps->shutting_down); |
| 958 | GPR_ASSERT(!ps->seen_inactive); |
| 959 | |
| 960 | gpr_mu_unlock(&ps->mu); /* unlock */ |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 961 | /* This is the designated polling thread at this point and should ideally do |
| 962 | polling. However, if there are unprocessed events left from a previous |
| 963 | call to do_epoll_wait(), skip calling epoll_wait() in this iteration and |
| 964 | process the pending epoll events. |
| 965 | |
| 966 | The reason for decoupling do_epoll_wait and process_epoll_events is to |
| 967 | better distrubute the work (i.e handling epoll events) across multiple |
| 968 | threads |
| 969 | |
| 970 | process_epoll_events() returns very quickly: It just queues the work on |
| 971 | exec_ctx but does not execute it (the actual exectution or more |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 972 | accurately grpc_core::ExecCtx::Get()->Flush() happens in end_worker() |
| 973 | AFTER selecting a designated poller). So we are not waiting long periods |
| 974 | without a designated poller */ |
Sree Kuchibhotla | a92a9cc | 2017-08-27 14:02:15 -0700 | [diff] [blame] | 975 | if (gpr_atm_acq_load(&g_epoll_set.cursor) == |
| 976 | gpr_atm_acq_load(&g_epoll_set.num_events)) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 977 | append_error(&error, do_epoll_wait(ps, deadline), err_desc); |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 978 | } |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 979 | append_error(&error, process_epoll_events(ps), err_desc); |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 980 | |
| 981 | gpr_mu_lock(&ps->mu); /* lock */ |
| 982 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 983 | gpr_tls_set(&g_current_thread_worker, 0); |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 984 | } else { |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 985 | gpr_tls_set(&g_current_thread_pollset, (intptr_t)ps); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 986 | } |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 987 | end_worker(ps, &worker, worker_hdl); |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 988 | |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 989 | gpr_tls_set(&g_current_thread_pollset, 0); |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 990 | GPR_TIMER_END("pollset_work", 0); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 991 | return error; |
| 992 | } |
| 993 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 994 | static grpc_error* pollset_kick(grpc_pollset* pollset, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 995 | grpc_pollset_worker* specific_worker) { |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 996 | GPR_TIMER_BEGIN("pollset_kick", 0); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 997 | GRPC_STATS_INC_POLLSET_KICK(); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 998 | grpc_error* ret_err = GRPC_ERROR_NONE; |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 999 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | b89bac0 | 2017-05-26 15:20:32 +0000 | [diff] [blame] | 1000 | gpr_strvec log; |
| 1001 | gpr_strvec_init(&log); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1002 | char* tmp; |
| 1003 | gpr_asprintf(&tmp, "PS:%p KICK:%p curps=%p curworker=%p root=%p", pollset, |
| 1004 | specific_worker, (void*)gpr_tls_get(&g_current_thread_pollset), |
| 1005 | (void*)gpr_tls_get(&g_current_thread_worker), |
| 1006 | pollset->root_worker); |
Craig Tiller | b89bac0 | 2017-05-26 15:20:32 +0000 | [diff] [blame] | 1007 | gpr_strvec_add(&log, tmp); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1008 | if (pollset->root_worker != nullptr) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 1009 | gpr_asprintf(&tmp, " {kick_state=%s next=%p {kick_state=%s}}", |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1010 | kick_state_string(pollset->root_worker->state), |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 1011 | pollset->root_worker->next, |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1012 | kick_state_string(pollset->root_worker->next->state)); |
Craig Tiller | b89bac0 | 2017-05-26 15:20:32 +0000 | [diff] [blame] | 1013 | gpr_strvec_add(&log, tmp); |
| 1014 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1015 | if (specific_worker != nullptr) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 1016 | gpr_asprintf(&tmp, " worker_kick_state=%s", |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1017 | kick_state_string(specific_worker->state)); |
Craig Tiller | b89bac0 | 2017-05-26 15:20:32 +0000 | [diff] [blame] | 1018 | gpr_strvec_add(&log, tmp); |
| 1019 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1020 | tmp = gpr_strvec_flatten(&log, nullptr); |
Craig Tiller | b89bac0 | 2017-05-26 15:20:32 +0000 | [diff] [blame] | 1021 | gpr_strvec_destroy(&log); |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 1022 | gpr_log(GPR_DEBUG, "%s", tmp); |
Craig Tiller | b89bac0 | 2017-05-26 15:20:32 +0000 | [diff] [blame] | 1023 | gpr_free(tmp); |
| 1024 | } |
Sree Kuchibhotla | fb34940 | 2017-09-06 10:58:06 -0700 | [diff] [blame] | 1025 | |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1026 | if (specific_worker == nullptr) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1027 | if (gpr_tls_get(&g_current_thread_pollset) != (intptr_t)pollset) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1028 | grpc_pollset_worker* root_worker = pollset->root_worker; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1029 | if (root_worker == nullptr) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1030 | GRPC_STATS_INC_POLLSET_KICKED_WITHOUT_POLLER(); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1031 | pollset->kicked_without_poller = true; |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 1032 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 1033 | gpr_log(GPR_DEBUG, " .. kicked_without_poller"); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 1034 | } |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 1035 | goto done; |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 1036 | } |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1037 | grpc_pollset_worker* next_worker = root_worker->next; |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1038 | if (root_worker->state == KICKED) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1039 | GRPC_STATS_INC_POLLSET_KICKED_AGAIN(); |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 1040 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 1041 | gpr_log(GPR_DEBUG, " .. already kicked %p", root_worker); |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 1042 | } |
| 1043 | SET_KICK_STATE(root_worker, KICKED); |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 1044 | goto done; |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1045 | } else if (next_worker->state == KICKED) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1046 | GRPC_STATS_INC_POLLSET_KICKED_AGAIN(); |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 1047 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 1048 | gpr_log(GPR_DEBUG, " .. already kicked %p", next_worker); |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 1049 | } |
| 1050 | SET_KICK_STATE(next_worker, KICKED); |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 1051 | goto done; |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 1052 | } else if (root_worker == |
| 1053 | next_worker && // only try and wake up a poller if |
| 1054 | // there is no next worker |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1055 | root_worker == (grpc_pollset_worker*)gpr_atm_no_barrier_load( |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 1056 | &g_active_poller)) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1057 | GRPC_STATS_INC_POLLSET_KICK_WAKEUP_FD(); |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 1058 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 1059 | gpr_log(GPR_DEBUG, " .. kicked %p", root_worker); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 1060 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 1061 | SET_KICK_STATE(root_worker, KICKED); |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 1062 | ret_err = grpc_wakeup_fd_wakeup(&global_wakeup_fd); |
| 1063 | goto done; |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1064 | } else if (next_worker->state == UNKICKED) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1065 | GRPC_STATS_INC_POLLSET_KICK_WAKEUP_CV(); |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 1066 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 1067 | gpr_log(GPR_DEBUG, " .. kicked %p", next_worker); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 1068 | } |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 1069 | GPR_ASSERT(next_worker->initialized_cv); |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 1070 | SET_KICK_STATE(next_worker, KICKED); |
Craig Tiller | 375eb25 | 2017-04-27 23:29:12 +0000 | [diff] [blame] | 1071 | gpr_cv_signal(&next_worker->cv); |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 1072 | goto done; |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1073 | } else if (next_worker->state == DESIGNATED_POLLER) { |
| 1074 | if (root_worker->state != DESIGNATED_POLLER) { |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 1075 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 1076 | gpr_log( |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 1077 | GPR_DEBUG, |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 1078 | " .. kicked root non-poller %p (initialized_cv=%d) (poller=%p)", |
| 1079 | root_worker, root_worker->initialized_cv, next_worker); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 1080 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 1081 | SET_KICK_STATE(root_worker, KICKED); |
| 1082 | if (root_worker->initialized_cv) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1083 | GRPC_STATS_INC_POLLSET_KICK_WAKEUP_CV(); |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 1084 | gpr_cv_signal(&root_worker->cv); |
| 1085 | } |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 1086 | goto done; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 1087 | } else { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1088 | GRPC_STATS_INC_POLLSET_KICK_WAKEUP_FD(); |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 1089 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 1090 | gpr_log(GPR_DEBUG, " .. non-root poller %p (root=%p)", next_worker, |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 1091 | root_worker); |
| 1092 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 1093 | SET_KICK_STATE(next_worker, KICKED); |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 1094 | ret_err = grpc_wakeup_fd_wakeup(&global_wakeup_fd); |
| 1095 | goto done; |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 1096 | } |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 1097 | } else { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1098 | GRPC_STATS_INC_POLLSET_KICKED_AGAIN(); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1099 | GPR_ASSERT(next_worker->state == KICKED); |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 1100 | SET_KICK_STATE(next_worker, KICKED); |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 1101 | goto done; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1102 | } |
| 1103 | } else { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1104 | GRPC_STATS_INC_POLLSET_KICK_OWN_THREAD(); |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 1105 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 1106 | gpr_log(GPR_DEBUG, " .. kicked while waking up"); |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 1107 | } |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 1108 | goto done; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1109 | } |
Sree Kuchibhotla | fb34940 | 2017-09-06 10:58:06 -0700 | [diff] [blame] | 1110 | |
| 1111 | GPR_UNREACHABLE_CODE(goto done); |
| 1112 | } |
| 1113 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1114 | if (specific_worker->state == KICKED) { |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 1115 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 1116 | gpr_log(GPR_DEBUG, " .. specific worker already kicked"); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 1117 | } |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 1118 | goto done; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1119 | } else if (gpr_tls_get(&g_current_thread_worker) == |
| 1120 | (intptr_t)specific_worker) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1121 | GRPC_STATS_INC_POLLSET_KICK_OWN_THREAD(); |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 1122 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 1123 | gpr_log(GPR_DEBUG, " .. mark %p kicked", specific_worker); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 1124 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 1125 | SET_KICK_STATE(specific_worker, KICKED); |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 1126 | goto done; |
Craig Tiller | 32f90ee | 2017-04-28 12:46:41 -0700 | [diff] [blame] | 1127 | } else if (specific_worker == |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1128 | (grpc_pollset_worker*)gpr_atm_no_barrier_load(&g_active_poller)) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1129 | GRPC_STATS_INC_POLLSET_KICK_WAKEUP_FD(); |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 1130 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 1131 | gpr_log(GPR_DEBUG, " .. kick active poller"); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 1132 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 1133 | SET_KICK_STATE(specific_worker, KICKED); |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 1134 | ret_err = grpc_wakeup_fd_wakeup(&global_wakeup_fd); |
| 1135 | goto done; |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 1136 | } else if (specific_worker->initialized_cv) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1137 | GRPC_STATS_INC_POLLSET_KICK_WAKEUP_CV(); |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 1138 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 1139 | gpr_log(GPR_DEBUG, " .. kick waiting worker"); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 1140 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 1141 | SET_KICK_STATE(specific_worker, KICKED); |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1142 | gpr_cv_signal(&specific_worker->cv); |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 1143 | goto done; |
Craig Tiller | 8502ecb | 2017-04-28 14:22:01 -0700 | [diff] [blame] | 1144 | } else { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1145 | GRPC_STATS_INC_POLLSET_KICKED_AGAIN(); |
ncteisen | 3cffe1f | 2017-11-10 13:56:23 -0800 | [diff] [blame] | 1146 | if (grpc_polling_trace.enabled()) { |
yang-g | 69b4e4c | 2018-01-24 14:36:20 -0800 | [diff] [blame] | 1147 | gpr_log(GPR_DEBUG, " .. kick non-waiting worker"); |
Craig Tiller | 75aef7f | 2017-05-26 08:26:08 -0700 | [diff] [blame] | 1148 | } |
Craig Tiller | 55624a3 | 2017-05-26 08:14:44 -0700 | [diff] [blame] | 1149 | SET_KICK_STATE(specific_worker, KICKED); |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 1150 | goto done; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1151 | } |
yang-g | df92a64 | 2017-08-21 22:38:45 -0700 | [diff] [blame] | 1152 | done: |
| 1153 | GPR_TIMER_END("pollset_kick", 0); |
| 1154 | return ret_err; |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1155 | } |
| 1156 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1157 | static void pollset_add_fd(grpc_pollset* pollset, grpc_fd* fd) {} |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1158 | |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1159 | /******************************************************************************* |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1160 | * Pollset-set Definitions |
| 1161 | */ |
| 1162 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1163 | static grpc_pollset_set* pollset_set_create(void) { |
| 1164 | return (grpc_pollset_set*)((intptr_t)0xdeafbeef); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1165 | } |
| 1166 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1167 | static void pollset_set_destroy(grpc_pollset_set* pss) {} |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1168 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1169 | static void pollset_set_add_fd(grpc_pollset_set* pss, grpc_fd* fd) {} |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1170 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1171 | static void pollset_set_del_fd(grpc_pollset_set* pss, grpc_fd* fd) {} |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1172 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1173 | static void pollset_set_add_pollset(grpc_pollset_set* pss, grpc_pollset* ps) {} |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1174 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1175 | static void pollset_set_del_pollset(grpc_pollset_set* pss, grpc_pollset* ps) {} |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1176 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1177 | static void pollset_set_add_pollset_set(grpc_pollset_set* bag, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1178 | grpc_pollset_set* item) {} |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1179 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1180 | static void pollset_set_del_pollset_set(grpc_pollset_set* bag, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1181 | grpc_pollset_set* item) {} |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1182 | |
| 1183 | /******************************************************************************* |
| 1184 | * Event engine binding |
| 1185 | */ |
| 1186 | |
| 1187 | static void shutdown_engine(void) { |
| 1188 | fd_global_shutdown(); |
| 1189 | pollset_global_shutdown(); |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 1190 | epoll_set_shutdown(); |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1191 | } |
| 1192 | |
| 1193 | static const grpc_event_engine_vtable vtable = { |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1194 | sizeof(grpc_pollset), |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1195 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1196 | fd_create, |
| 1197 | fd_wrapped_fd, |
| 1198 | fd_orphan, |
| 1199 | fd_shutdown, |
| 1200 | fd_notify_on_read, |
| 1201 | fd_notify_on_write, |
| 1202 | fd_is_shutdown, |
| 1203 | fd_get_read_notifier_pollset, |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1204 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1205 | pollset_init, |
| 1206 | pollset_shutdown, |
| 1207 | pollset_destroy, |
| 1208 | pollset_work, |
| 1209 | pollset_kick, |
| 1210 | pollset_add_fd, |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1211 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1212 | pollset_set_create, |
| 1213 | pollset_set_destroy, |
| 1214 | pollset_set_add_pollset, |
| 1215 | pollset_set_del_pollset, |
| 1216 | pollset_set_add_pollset_set, |
| 1217 | pollset_set_del_pollset_set, |
| 1218 | pollset_set_add_fd, |
| 1219 | pollset_set_del_fd, |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1220 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1221 | shutdown_engine, |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1222 | }; |
| 1223 | |
| 1224 | /* It is possible that GLIBC has epoll but the underlying kernel doesn't. |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 1225 | * Create epoll_fd (epoll_set_init() takes care of that) to make sure epoll |
| 1226 | * support is available */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1227 | const grpc_event_engine_vtable* grpc_init_epoll1_linux(bool explicit_request) { |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1228 | if (!grpc_has_wakeup_fd()) { |
yang-g | 30101b0 | 2017-11-06 14:35:30 -0800 | [diff] [blame] | 1229 | gpr_log(GPR_ERROR, "Skipping epoll1 because of no wakeup fd."); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1230 | return nullptr; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1231 | } |
| 1232 | |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 1233 | if (!epoll_set_init()) { |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1234 | return nullptr; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1235 | } |
| 1236 | |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1237 | fd_global_init(); |
| 1238 | |
| 1239 | if (!GRPC_LOG_IF_ERROR("pollset_global_init", pollset_global_init())) { |
Craig Tiller | 4509c47 | 2017-04-27 19:05:13 +0000 | [diff] [blame] | 1240 | fd_global_shutdown(); |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 1241 | epoll_set_shutdown(); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1242 | return nullptr; |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1243 | } |
| 1244 | |
| 1245 | return &vtable; |
| 1246 | } |
| 1247 | |
Mehrdad Afshari | fb66900 | 2018-01-17 15:37:56 -0800 | [diff] [blame] | 1248 | #else /* defined(GRPC_LINUX_EPOLL) */ |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1249 | #if defined(GRPC_POSIX_SOCKET) |
Yash Tibrewal | 1cac223 | 2017-09-26 11:31:11 -0700 | [diff] [blame] | 1250 | #include "src/core/lib/iomgr/ev_epoll1_linux.h" |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1251 | /* If GRPC_LINUX_EPOLL is not defined, it means epoll is not available. Return |
| 1252 | * NULL */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1253 | const grpc_event_engine_vtable* grpc_init_epoll1_linux(bool explicit_request) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1254 | return nullptr; |
Craig Tiller | 9ddb315 | 2017-04-27 21:32:56 +0000 | [diff] [blame] | 1255 | } |
Craig Tiller | c67cc99 | 2017-04-27 10:15:51 -0700 | [diff] [blame] | 1256 | #endif /* defined(GRPC_POSIX_SOCKET) */ |
Mehrdad Afshari | fb66900 | 2018-01-17 15:37:56 -0800 | [diff] [blame] | 1257 | #endif /* !defined(GRPC_LINUX_EPOLL) */ |