David Garcia Quintas | 4bc3463 | 2015-10-07 16:12:35 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 3 | * Copyright 2015 gRPC authors. |
David Garcia Quintas | 4bc3463 | 2015-10-07 16:12:35 -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 |
David Garcia Quintas | 4bc3463 | 2015-10-07 16:12:35 -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 |
David Garcia Quintas | 4bc3463 | 2015-10-07 16:12:35 -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. |
David Garcia Quintas | 4bc3463 | 2015-10-07 16:12:35 -0700 | [diff] [blame] | 16 | * |
| 17 | */ |
| 18 | |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 19 | #include "src/core/lib/iomgr/executor.h" |
David Garcia Quintas | 4bc3463 | 2015-10-07 16:12:35 -0700 | [diff] [blame] | 20 | |
| 21 | #include <string.h> |
| 22 | |
| 23 | #include <grpc/support/alloc.h> |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 24 | #include <grpc/support/cpu.h> |
David Garcia Quintas | 4bc3463 | 2015-10-07 16:12:35 -0700 | [diff] [blame] | 25 | #include <grpc/support/log.h> |
| 26 | #include <grpc/support/sync.h> |
| 27 | #include <grpc/support/thd.h> |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 28 | #include <grpc/support/tls.h> |
| 29 | #include <grpc/support/useful.h> |
| 30 | |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 31 | #include "src/core/lib/iomgr/exec_ctx.h" |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 32 | #include "src/core/lib/support/spinlock.h" |
David Garcia Quintas | 4bc3463 | 2015-10-07 16:12:35 -0700 | [diff] [blame] | 33 | |
Craig Tiller | 1ed3118 | 2017-05-24 16:42:35 -0700 | [diff] [blame] | 34 | #define MAX_DEPTH 2 |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 35 | |
| 36 | typedef struct { |
David Garcia Quintas | 4bc3463 | 2015-10-07 16:12:35 -0700 | [diff] [blame] | 37 | gpr_mu mu; |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 38 | gpr_cv cv; |
| 39 | grpc_closure_list elems; |
| 40 | size_t depth; |
| 41 | bool shutdown; |
Craig Tiller | c2fb83e | 2017-07-18 12:38:25 -0700 | [diff] [blame] | 42 | bool queued_long_job; |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 43 | gpr_thd_id id; |
| 44 | } thread_state; |
David Garcia Quintas | 4bc3463 | 2015-10-07 16:12:35 -0700 | [diff] [blame] | 45 | |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 46 | static thread_state *g_thread_state; |
| 47 | static size_t g_max_threads; |
| 48 | static gpr_atm g_cur_threads; |
| 49 | static gpr_spinlock g_adding_thread_lock = GPR_SPINLOCK_STATIC_INITIALIZER; |
| 50 | |
| 51 | GPR_TLS_DECL(g_this_thread_state); |
| 52 | |
Craig Tiller | af723b0 | 2017-07-17 17:56:28 -0700 | [diff] [blame] | 53 | static grpc_tracer_flag executor_trace = |
| 54 | GRPC_TRACER_INITIALIZER(false, "executor"); |
| 55 | |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 56 | static void executor_thread(void *arg); |
David Garcia Quintas | 4bc3463 | 2015-10-07 16:12:35 -0700 | [diff] [blame] | 57 | |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 58 | static size_t run_closures(grpc_exec_ctx *exec_ctx, grpc_closure_list list) { |
| 59 | size_t n = 0; |
David Garcia Quintas | 4bc3463 | 2015-10-07 16:12:35 -0700 | [diff] [blame] | 60 | |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 61 | grpc_closure *c = list.head; |
Craig Tiller | 061ef74 | 2016-12-29 10:54:09 -0800 | [diff] [blame] | 62 | while (c != NULL) { |
| 63 | grpc_closure *next = c->next_data.next; |
| 64 | grpc_error *error = c->error_data.error; |
Craig Tiller | af723b0 | 2017-07-17 17:56:28 -0700 | [diff] [blame] | 65 | if (GRPC_TRACER_ON(executor_trace)) { |
| 66 | #ifndef NDEBUG |
| 67 | gpr_log(GPR_DEBUG, "EXECUTOR: run %p [created by %s:%d]", c, |
| 68 | c->file_created, c->line_created); |
| 69 | #else |
| 70 | gpr_log(GPR_DEBUG, "EXECUTOR: run %p", c); |
| 71 | #endif |
| 72 | } |
ncteisen | f8061e8 | 2017-06-09 10:44:42 -0700 | [diff] [blame] | 73 | #ifndef NDEBUG |
Craig Tiller | b9b01ce | 2017-05-12 13:47:10 -0700 | [diff] [blame] | 74 | c->scheduled = false; |
Mark D. Roth | 43f774e | 2017-04-04 16:35:37 -0700 | [diff] [blame] | 75 | #endif |
Craig Tiller | 0b09341 | 2017-01-03 09:49:07 -0800 | [diff] [blame] | 76 | c->cb(exec_ctx, c->cb_arg, error); |
Craig Tiller | 061ef74 | 2016-12-29 10:54:09 -0800 | [diff] [blame] | 77 | GRPC_ERROR_UNREF(error); |
| 78 | c = next; |
Craig Tiller | f21acdd | 2017-06-08 08:09:35 -0700 | [diff] [blame] | 79 | n++; |
Craig Tiller | 1ab56d8 | 2017-07-19 09:55:57 -0700 | [diff] [blame^] | 80 | grpc_exec_ctx_flush(exec_ctx); |
Craig Tiller | 061ef74 | 2016-12-29 10:54:09 -0800 | [diff] [blame] | 81 | } |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 82 | |
| 83 | return n; |
| 84 | } |
| 85 | |
Craig Tiller | 5e56f00 | 2017-05-16 15:02:50 -0700 | [diff] [blame] | 86 | bool grpc_executor_is_threaded() { |
| 87 | return gpr_atm_no_barrier_load(&g_cur_threads) > 0; |
| 88 | } |
| 89 | |
| 90 | void grpc_executor_set_threading(grpc_exec_ctx *exec_ctx, bool threading) { |
| 91 | gpr_atm cur_threads = gpr_atm_no_barrier_load(&g_cur_threads); |
| 92 | if (threading) { |
| 93 | if (cur_threads > 0) return; |
| 94 | g_max_threads = GPR_MAX(1, 2 * gpr_cpu_num_cores()); |
| 95 | gpr_atm_no_barrier_store(&g_cur_threads, 1); |
| 96 | gpr_tls_init(&g_this_thread_state); |
| 97 | g_thread_state = gpr_zalloc(sizeof(thread_state) * g_max_threads); |
| 98 | for (size_t i = 0; i < g_max_threads; i++) { |
| 99 | gpr_mu_init(&g_thread_state[i].mu); |
| 100 | gpr_cv_init(&g_thread_state[i].cv); |
| 101 | g_thread_state[i].elems = (grpc_closure_list)GRPC_CLOSURE_LIST_INIT; |
| 102 | } |
| 103 | |
| 104 | gpr_thd_options opt = gpr_thd_options_default(); |
| 105 | gpr_thd_options_set_joinable(&opt); |
| 106 | gpr_thd_new(&g_thread_state[0].id, executor_thread, &g_thread_state[0], |
| 107 | &opt); |
| 108 | } else { |
| 109 | if (cur_threads == 0) return; |
| 110 | for (size_t i = 0; i < g_max_threads; i++) { |
| 111 | gpr_mu_lock(&g_thread_state[i].mu); |
| 112 | g_thread_state[i].shutdown = true; |
| 113 | gpr_cv_signal(&g_thread_state[i].cv); |
| 114 | gpr_mu_unlock(&g_thread_state[i].mu); |
| 115 | } |
Craig Tiller | f7c8c9f | 2017-05-17 15:22:05 -0700 | [diff] [blame] | 116 | /* ensure no thread is adding a new thread... once this is past, then |
| 117 | no thread will try to add a new one either (since shutdown is true) */ |
| 118 | gpr_spinlock_lock(&g_adding_thread_lock); |
| 119 | gpr_spinlock_unlock(&g_adding_thread_lock); |
Craig Tiller | 5e56f00 | 2017-05-16 15:02:50 -0700 | [diff] [blame] | 120 | for (gpr_atm i = 0; i < g_cur_threads; i++) { |
| 121 | gpr_thd_join(g_thread_state[i].id); |
| 122 | } |
| 123 | gpr_atm_no_barrier_store(&g_cur_threads, 0); |
| 124 | for (size_t i = 0; i < g_max_threads; i++) { |
| 125 | gpr_mu_destroy(&g_thread_state[i].mu); |
| 126 | gpr_cv_destroy(&g_thread_state[i].cv); |
| 127 | run_closures(exec_ctx, g_thread_state[i].elems); |
| 128 | } |
| 129 | gpr_free(g_thread_state); |
| 130 | gpr_tls_destroy(&g_this_thread_state); |
David Garcia Quintas | 4bc3463 | 2015-10-07 16:12:35 -0700 | [diff] [blame] | 131 | } |
Craig Tiller | 5e56f00 | 2017-05-16 15:02:50 -0700 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | void grpc_executor_init(grpc_exec_ctx *exec_ctx) { |
Craig Tiller | af723b0 | 2017-07-17 17:56:28 -0700 | [diff] [blame] | 135 | grpc_register_tracer(&executor_trace); |
Craig Tiller | b9b01ce | 2017-05-12 13:47:10 -0700 | [diff] [blame] | 136 | gpr_atm_no_barrier_store(&g_cur_threads, 0); |
Craig Tiller | 5e56f00 | 2017-05-16 15:02:50 -0700 | [diff] [blame] | 137 | grpc_executor_set_threading(exec_ctx, true); |
| 138 | } |
| 139 | |
| 140 | void grpc_executor_shutdown(grpc_exec_ctx *exec_ctx) { |
| 141 | grpc_executor_set_threading(exec_ctx, false); |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 142 | } |
| 143 | |
| 144 | static void executor_thread(void *arg) { |
| 145 | thread_state *ts = arg; |
| 146 | gpr_tls_set(&g_this_thread_state, (intptr_t)ts); |
| 147 | |
Craig Tiller | 8996208 | 2017-05-12 14:30:42 -0700 | [diff] [blame] | 148 | grpc_exec_ctx exec_ctx = |
| 149 | GRPC_EXEC_CTX_INITIALIZER(0, grpc_never_ready_to_finish, NULL); |
| 150 | |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 151 | size_t subtract_depth = 0; |
| 152 | for (;;) { |
Craig Tiller | af723b0 | 2017-07-17 17:56:28 -0700 | [diff] [blame] | 153 | if (GRPC_TRACER_ON(executor_trace)) { |
| 154 | gpr_log(GPR_DEBUG, |
| 155 | "EXECUTOR[%" PRIdPTR "]: step (sub_depth=%" PRIdPTR ")", |
| 156 | ts - g_thread_state, subtract_depth); |
| 157 | } |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 158 | gpr_mu_lock(&ts->mu); |
| 159 | ts->depth -= subtract_depth; |
| 160 | while (grpc_closure_list_empty(ts->elems) && !ts->shutdown) { |
Craig Tiller | 1ab56d8 | 2017-07-19 09:55:57 -0700 | [diff] [blame^] | 161 | ts->queued_long_job = false; |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 162 | gpr_cv_wait(&ts->cv, &ts->mu, gpr_inf_future(GPR_CLOCK_REALTIME)); |
| 163 | } |
| 164 | if (ts->shutdown) { |
Craig Tiller | af723b0 | 2017-07-17 17:56:28 -0700 | [diff] [blame] | 165 | if (GRPC_TRACER_ON(executor_trace)) { |
| 166 | gpr_log(GPR_DEBUG, "EXECUTOR[%" PRIdPTR "]: shutdown", |
| 167 | ts - g_thread_state); |
| 168 | } |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 169 | gpr_mu_unlock(&ts->mu); |
| 170 | break; |
| 171 | } |
| 172 | grpc_closure_list exec = ts->elems; |
| 173 | ts->elems = (grpc_closure_list)GRPC_CLOSURE_LIST_INIT; |
| 174 | gpr_mu_unlock(&ts->mu); |
Craig Tiller | af723b0 | 2017-07-17 17:56:28 -0700 | [diff] [blame] | 175 | if (GRPC_TRACER_ON(executor_trace)) { |
| 176 | gpr_log(GPR_DEBUG, "EXECUTOR[%" PRIdPTR "]: execute", |
| 177 | ts - g_thread_state); |
| 178 | } |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 179 | |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 180 | subtract_depth = run_closures(&exec_ctx, exec); |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 181 | } |
Craig Tiller | 8996208 | 2017-05-12 14:30:42 -0700 | [diff] [blame] | 182 | grpc_exec_ctx_finish(&exec_ctx); |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | static void executor_push(grpc_exec_ctx *exec_ctx, grpc_closure *closure, |
Craig Tiller | 7a82afd | 2017-07-18 09:40:40 -0700 | [diff] [blame] | 186 | grpc_error *error, bool is_short) { |
Craig Tiller | 61f96c1 | 2017-05-12 13:36:39 -0700 | [diff] [blame] | 187 | size_t cur_thread_count = (size_t)gpr_atm_no_barrier_load(&g_cur_threads); |
Craig Tiller | b9b01ce | 2017-05-12 13:47:10 -0700 | [diff] [blame] | 188 | if (cur_thread_count == 0) { |
Craig Tiller | af723b0 | 2017-07-17 17:56:28 -0700 | [diff] [blame] | 189 | if (GRPC_TRACER_ON(executor_trace)) { |
Craig Tiller | c2fb83e | 2017-07-18 12:38:25 -0700 | [diff] [blame] | 190 | #ifndef NDEBUG |
Craig Tiller | af723b0 | 2017-07-17 17:56:28 -0700 | [diff] [blame] | 191 | gpr_log(GPR_DEBUG, "EXECUTOR: schedule %p inline", closure); |
Craig Tiller | c2fb83e | 2017-07-18 12:38:25 -0700 | [diff] [blame] | 192 | #else |
| 193 | gpr_log(GPR_DEBUG, "EXECUTOR: schedule %p (created %s:%d) inline", |
| 194 | closure, closure->file_created, closure->line_created); |
| 195 | #endif |
Craig Tiller | af723b0 | 2017-07-17 17:56:28 -0700 | [diff] [blame] | 196 | } |
Craig Tiller | b9b01ce | 2017-05-12 13:47:10 -0700 | [diff] [blame] | 197 | grpc_closure_list_append(&exec_ctx->closure_list, closure, error); |
| 198 | return; |
| 199 | } |
| 200 | thread_state *ts = (thread_state *)gpr_tls_get(&g_this_thread_state); |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 201 | if (ts == NULL) { |
Craig Tiller | 61f96c1 | 2017-05-12 13:36:39 -0700 | [diff] [blame] | 202 | ts = &g_thread_state[GPR_HASH_POINTER(exec_ctx, cur_thread_count)]; |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 203 | } |
Craig Tiller | c2fb83e | 2017-07-18 12:38:25 -0700 | [diff] [blame] | 204 | thread_state *orig_ts = ts; |
| 205 | |
| 206 | bool try_new_thread; |
Craig Tiller | 1ab56d8 | 2017-07-19 09:55:57 -0700 | [diff] [blame^] | 207 | bool retry_push = false; |
Craig Tiller | c2fb83e | 2017-07-18 12:38:25 -0700 | [diff] [blame] | 208 | for (;;) { |
| 209 | if (GRPC_TRACER_ON(executor_trace)) { |
| 210 | #ifndef NDEBUG |
| 211 | gpr_log(GPR_DEBUG, |
| 212 | "EXECUTOR: try to schedule %p (%s) (created %s:%d) to thread " |
| 213 | "%" PRIdPTR, |
| 214 | closure, is_short ? "short" : "long", closure->file_created, |
| 215 | closure->line_created, ts - g_thread_state); |
| 216 | #else |
| 217 | gpr_log(GPR_DEBUG, |
| 218 | "EXECUTOR: try to schedule %p (%s) to thread %" PRIdPTR, closure, |
| 219 | is_short ? "short" : "long", ts - g_thread_state); |
| 220 | #endif |
| 221 | } |
| 222 | gpr_mu_lock(&ts->mu); |
| 223 | if (ts->queued_long_job) { |
| 224 | gpr_mu_unlock(&ts->mu); |
| 225 | intptr_t idx = ts - g_thread_state; |
| 226 | ts = &g_thread_state[(idx + 1) % g_cur_threads]; |
| 227 | if (ts == orig_ts) { |
Craig Tiller | 1ab56d8 | 2017-07-19 09:55:57 -0700 | [diff] [blame^] | 228 | retry_push = true; |
| 229 | try_new_thread = true; |
| 230 | break; |
Craig Tiller | c2fb83e | 2017-07-18 12:38:25 -0700 | [diff] [blame] | 231 | } |
| 232 | continue; |
| 233 | } |
| 234 | if (grpc_closure_list_empty(ts->elems)) { |
| 235 | gpr_cv_signal(&ts->cv); |
| 236 | } |
| 237 | grpc_closure_list_append(&ts->elems, closure, error); |
| 238 | ts->depth++; |
| 239 | try_new_thread = ts->depth > MAX_DEPTH && |
| 240 | cur_thread_count < g_max_threads && !ts->shutdown; |
| 241 | if (!is_short) ts->queued_long_job = true; |
| 242 | gpr_mu_unlock(&ts->mu); |
| 243 | break; |
Craig Tiller | af723b0 | 2017-07-17 17:56:28 -0700 | [diff] [blame] | 244 | } |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 245 | if (try_new_thread && gpr_spinlock_trylock(&g_adding_thread_lock)) { |
Craig Tiller | 61f96c1 | 2017-05-12 13:36:39 -0700 | [diff] [blame] | 246 | cur_thread_count = (size_t)gpr_atm_no_barrier_load(&g_cur_threads); |
Craig Tiller | 3e9f98e | 2017-05-12 13:17:47 -0700 | [diff] [blame] | 247 | if (cur_thread_count < g_max_threads) { |
| 248 | gpr_atm_no_barrier_store(&g_cur_threads, cur_thread_count + 1); |
| 249 | |
| 250 | gpr_thd_options opt = gpr_thd_options_default(); |
| 251 | gpr_thd_options_set_joinable(&opt); |
| 252 | gpr_thd_new(&g_thread_state[cur_thread_count].id, executor_thread, |
| 253 | &g_thread_state[cur_thread_count], &opt); |
| 254 | } |
| 255 | gpr_spinlock_unlock(&g_adding_thread_lock); |
| 256 | } |
Craig Tiller | 1ab56d8 | 2017-07-19 09:55:57 -0700 | [diff] [blame^] | 257 | if (retry_push) { |
| 258 | executor_push(exec_ctx, closure, error, is_short); |
| 259 | } |
David Garcia Quintas | 4bc3463 | 2015-10-07 16:12:35 -0700 | [diff] [blame] | 260 | } |
Craig Tiller | 91031da | 2016-12-28 15:44:25 -0800 | [diff] [blame] | 261 | |
Craig Tiller | 7a82afd | 2017-07-18 09:40:40 -0700 | [diff] [blame] | 262 | static void executor_push_short(grpc_exec_ctx *exec_ctx, grpc_closure *closure, |
| 263 | grpc_error *error) { |
| 264 | executor_push(exec_ctx, closure, error, true); |
| 265 | } |
| 266 | |
| 267 | static void executor_push_long(grpc_exec_ctx *exec_ctx, grpc_closure *closure, |
| 268 | grpc_error *error) { |
| 269 | executor_push(exec_ctx, closure, error, false); |
| 270 | } |
| 271 | |
| 272 | static const grpc_closure_scheduler_vtable executor_vtable_short = { |
| 273 | executor_push_short, executor_push_short, "executor"}; |
| 274 | static grpc_closure_scheduler executor_scheduler_short = { |
| 275 | &executor_vtable_short}; |
| 276 | |
| 277 | static const grpc_closure_scheduler_vtable executor_vtable_long = { |
| 278 | executor_push_long, executor_push_long, "executor"}; |
| 279 | static grpc_closure_scheduler executor_scheduler_long = {&executor_vtable_long}; |
| 280 | |
| 281 | grpc_closure_scheduler *grpc_executor_scheduler( |
| 282 | grpc_executor_job_length length) { |
| 283 | return length == GRPC_EXECUTOR_SHORT ? &executor_scheduler_short |
| 284 | : &executor_scheduler_long; |
| 285 | } |