Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 3 | * Copyright 2017 gRPC authors. |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 4 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 8 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 10 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 16 | * |
| 17 | */ |
| 18 | |
| 19 | #include "src/core/lib/iomgr/port.h" |
| 20 | |
yang-g | ceb2475 | 2017-11-07 12:06:37 -0800 | [diff] [blame] | 21 | #include <grpc/support/log.h> |
| 22 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 23 | /* This polling engine is only relevant on linux kernels supporting epoll() */ |
| 24 | #ifdef GRPC_LINUX_EPOLL |
| 25 | |
Craig Tiller | c610985 | 2017-05-01 14:26:49 -0700 | [diff] [blame] | 26 | #include "src/core/lib/iomgr/ev_epollex_linux.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 27 | |
| 28 | #include <assert.h> |
| 29 | #include <errno.h> |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 30 | #include <limits.h> |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 31 | #include <poll.h> |
| 32 | #include <pthread.h> |
| 33 | #include <string.h> |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 34 | #include <sys/socket.h> |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame] | 35 | #include <sys/syscall.h> |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 36 | #include <unistd.h> |
| 37 | |
| 38 | #include <grpc/support/alloc.h> |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 39 | #include <grpc/support/string_util.h> |
| 40 | #include <grpc/support/tls.h> |
| 41 | #include <grpc/support/useful.h> |
| 42 | |
Craig Tiller | b4bb1cd | 2017-07-20 14:18:17 -0700 | [diff] [blame] | 43 | #include "src/core/lib/debug/stats.h" |
Craig Tiller | 6b7c1fb | 2017-07-19 15:45:03 -0700 | [diff] [blame] | 44 | #include "src/core/lib/iomgr/block_annotate.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 45 | #include "src/core/lib/iomgr/iomgr_internal.h" |
Craig Tiller | 819cd88 | 2017-04-25 13:18:22 -0700 | [diff] [blame] | 46 | #include "src/core/lib/iomgr/is_epollexclusive_available.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 47 | #include "src/core/lib/iomgr/lockfree_event.h" |
Craig Tiller | 819cd88 | 2017-04-25 13:18:22 -0700 | [diff] [blame] | 48 | #include "src/core/lib/iomgr/sys_epoll_wrapper.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 49 | #include "src/core/lib/iomgr/timer.h" |
| 50 | #include "src/core/lib/iomgr/wakeup_fd_posix.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 51 | #include "src/core/lib/profiling/timers.h" |
Craig Tiller | fbf61bb | 2017-11-08 11:50:14 -0800 | [diff] [blame] | 52 | #include "src/core/lib/support/manual_constructor.h" |
Craig Tiller | 0b4c901 | 2017-04-06 17:19:37 -0700 | [diff] [blame] | 53 | #include "src/core/lib/support/spinlock.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 54 | |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 55 | // debug aid: create workers on the heap (allows asan to spot |
| 56 | // use-after-destruction) |
Craig Tiller | 513daab | 2017-10-06 09:18:34 -0700 | [diff] [blame] | 57 | //#define GRPC_EPOLLEX_CREATE_WORKERS_ON_HEAP 1 |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 58 | |
Craig Tiller | 8223f41 | 2017-10-17 22:05:55 +0000 | [diff] [blame] | 59 | #define MAX_EPOLL_EVENTS 100 |
| 60 | #define MAX_EPOLL_EVENTS_HANDLED_EACH_POLL_CALL 5 |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 61 | |
Noah Eisen | c384d81 | 2017-11-12 20:14:27 -0800 | [diff] [blame] | 62 | grpc_core::DebugOnlyTraceFlag grpc_trace_pollable_refcount(false, |
| 63 | "pollable_refcount"); |
Craig Tiller | bd412f9 | 2017-04-07 13:45:19 -0700 | [diff] [blame] | 64 | |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 65 | /******************************************************************************* |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 66 | * pollable Declarations |
| 67 | */ |
| 68 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 69 | typedef enum { PO_MULTI, PO_FD, PO_EMPTY } pollable_type; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 70 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 71 | typedef struct pollable pollable; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 72 | |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 73 | /// A pollable is something that can be polled: it has an epoll set to poll on, |
| 74 | /// and a wakeup fd for kicks |
| 75 | /// There are three broad types: |
| 76 | /// - PO_EMPTY - the empty pollable, used before file descriptors are added to |
| 77 | /// a pollset |
| 78 | /// - PO_FD - a pollable containing only one FD - used to optimize single-fd |
| 79 | /// pollsets (which are common with synchronous api usage) |
| 80 | /// - PO_MULTI - a pollable containing many fds |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 81 | struct pollable { |
| 82 | pollable_type type; // immutable |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 83 | gpr_refcount refs; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 84 | |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 85 | int epfd; |
| 86 | grpc_wakeup_fd wakeup; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 87 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 88 | // only for type fd... one ref to the owner fd |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 89 | grpc_fd* owner_fd; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 90 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 91 | grpc_pollset_set* pollset_set; |
| 92 | pollable* next; |
| 93 | pollable* prev; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 94 | |
| 95 | gpr_mu mu; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 96 | grpc_pollset_worker* root_worker; |
Craig Tiller | 8223f41 | 2017-10-17 22:05:55 +0000 | [diff] [blame] | 97 | |
| 98 | int event_cursor; |
| 99 | int event_count; |
| 100 | struct epoll_event events[MAX_EPOLL_EVENTS]; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 101 | }; |
| 102 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 103 | static const char* pollable_type_string(pollable_type t) { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 104 | switch (t) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 105 | case PO_MULTI: |
Craig Tiller | 7fd8f67 | 2017-07-05 15:10:12 -0700 | [diff] [blame] | 106 | return "pollset"; |
| 107 | case PO_FD: |
| 108 | return "fd"; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 109 | case PO_EMPTY: |
| 110 | return "empty"; |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 111 | } |
| 112 | return "<invalid>"; |
| 113 | } |
| 114 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 115 | static char* pollable_desc(pollable* p) { |
| 116 | char* out; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 117 | gpr_asprintf(&out, "type=%s epfd=%d wakeup=%d", pollable_type_string(p->type), |
| 118 | p->epfd, p->wakeup.read_fd); |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 119 | return out; |
| 120 | } |
| 121 | |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 122 | /// Shared empty pollable - used by pollset to poll on until the first fd is |
| 123 | /// added |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 124 | static pollable* g_empty_pollable; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 125 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 126 | static grpc_error* pollable_create(pollable_type type, pollable** p); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 127 | #ifdef NDEBUG |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 128 | static pollable* pollable_ref(pollable* p); |
| 129 | static void pollable_unref(pollable* p); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 130 | #define POLLABLE_REF(p, r) pollable_ref(p) |
| 131 | #define POLLABLE_UNREF(p, r) pollable_unref(p) |
| 132 | #else |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 133 | static pollable* pollable_ref(pollable* p, int line, const char* reason); |
| 134 | static void pollable_unref(pollable* p, int line, const char* reason); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 135 | #define POLLABLE_REF(p, r) pollable_ref((p), __LINE__, (r)) |
| 136 | #define POLLABLE_UNREF(p, r) pollable_unref((p), __LINE__, (r)) |
| 137 | #endif |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 138 | |
| 139 | /******************************************************************************* |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 140 | * Fd Declarations |
| 141 | */ |
| 142 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 143 | struct grpc_fd { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 144 | int fd; |
| 145 | /* refst format: |
| 146 | bit 0 : 1=Active / 0=Orphaned |
| 147 | bits 1-n : refcount |
| 148 | Ref/Unref by two to avoid altering the orphaned bit */ |
| 149 | gpr_atm refst; |
| 150 | |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 151 | gpr_mu orphan_mu; |
| 152 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 153 | gpr_mu pollable_mu; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 154 | pollable* pollable_obj; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 155 | |
Craig Tiller | fbf61bb | 2017-11-08 11:50:14 -0800 | [diff] [blame] | 156 | grpc_core::ManualConstructor<grpc_core::LockfreeEvent> read_closure; |
| 157 | grpc_core::ManualConstructor<grpc_core::LockfreeEvent> write_closure; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 158 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 159 | struct grpc_fd* freelist_next; |
| 160 | grpc_closure* on_done_closure; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 161 | |
| 162 | /* The pollset that last noticed that the fd is readable. The actual type |
| 163 | * stored in this is (grpc_pollset *) */ |
| 164 | gpr_atm read_notifier_pollset; |
| 165 | |
| 166 | grpc_iomgr_object iomgr_object; |
| 167 | }; |
| 168 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 169 | static void fd_global_init(void); |
| 170 | static void fd_global_shutdown(void); |
| 171 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 172 | /******************************************************************************* |
| 173 | * Pollset Declarations |
| 174 | */ |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 175 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 176 | typedef struct { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 177 | grpc_pollset_worker* next; |
| 178 | grpc_pollset_worker* prev; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 179 | } pwlink; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 180 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 181 | typedef enum { PWLINK_POLLABLE = 0, PWLINK_POLLSET, PWLINK_COUNT } pwlinks; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 182 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 183 | struct grpc_pollset_worker { |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 184 | bool kicked; |
| 185 | bool initialized_cv; |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 186 | #ifndef NDEBUG |
| 187 | // debug aid: which thread started this worker |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 188 | pid_t originator; |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 189 | #endif |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 190 | gpr_cv cv; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 191 | grpc_pollset* pollset; |
| 192 | pollable* pollable_obj; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 193 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 194 | pwlink links[PWLINK_COUNT]; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 195 | }; |
| 196 | |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 197 | struct grpc_pollset { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 198 | gpr_mu mu; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 199 | pollable* active_pollable; |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 200 | bool kicked_without_poller; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 201 | grpc_closure* shutdown_closure; |
| 202 | grpc_pollset_worker* root_worker; |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 203 | int containing_pollset_set_count; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 204 | }; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 205 | |
| 206 | /******************************************************************************* |
| 207 | * Pollset-set Declarations |
| 208 | */ |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 209 | |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 210 | struct grpc_pollset_set { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 211 | gpr_refcount refs; |
| 212 | gpr_mu mu; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 213 | grpc_pollset_set* parent; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 214 | |
| 215 | size_t pollset_count; |
| 216 | size_t pollset_capacity; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 217 | grpc_pollset** pollsets; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 218 | |
| 219 | size_t fd_count; |
| 220 | size_t fd_capacity; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 221 | grpc_fd** fds; |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 222 | }; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 223 | |
| 224 | /******************************************************************************* |
| 225 | * Common helpers |
| 226 | */ |
| 227 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 228 | static bool append_error(grpc_error** composite, grpc_error* error, |
| 229 | const char* desc) { |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 230 | if (error == GRPC_ERROR_NONE) return true; |
| 231 | if (*composite == GRPC_ERROR_NONE) { |
| 232 | *composite = GRPC_ERROR_CREATE_FROM_COPIED_STRING(desc); |
| 233 | } |
| 234 | *composite = grpc_error_add_child(*composite, error); |
| 235 | return false; |
| 236 | } |
| 237 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 238 | /******************************************************************************* |
| 239 | * Fd Definitions |
| 240 | */ |
| 241 | |
| 242 | /* We need to keep a freelist not because of any concerns of malloc performance |
| 243 | * but instead so that implementations with multiple threads in (for example) |
| 244 | * epoll_wait deal with the race between pollset removal and incoming poll |
| 245 | * notifications. |
| 246 | * |
| 247 | * The problem is that the poller ultimately holds a reference to this |
| 248 | * object, so it is very difficult to know when is safe to free it, at least |
| 249 | * without some expensive synchronization. |
| 250 | * |
| 251 | * If we keep the object freelisted, in the worst case losing this race just |
| 252 | * becomes a spurious read notification on a reused fd. |
| 253 | */ |
| 254 | |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 255 | static grpc_fd* fd_freelist = nullptr; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 256 | static gpr_mu fd_freelist_mu; |
| 257 | |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 258 | #ifndef NDEBUG |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 259 | #define REF_BY(fd, n, reason) ref_by(fd, n, reason, __FILE__, __LINE__) |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 260 | #define UNREF_BY(ec, fd, n, reason) \ |
| 261 | unref_by(ec, fd, n, reason, __FILE__, __LINE__) |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 262 | static void ref_by(grpc_fd* fd, int n, const char* reason, const char* file, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 263 | int line) { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 264 | if (grpc_trace_fd_refcount.enabled()) { |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 265 | gpr_log(GPR_DEBUG, |
| 266 | "FD %d %p ref %d %" PRIdPTR " -> %" PRIdPTR " [%s; %s:%d]", |
| 267 | fd->fd, fd, n, gpr_atm_no_barrier_load(&fd->refst), |
| 268 | gpr_atm_no_barrier_load(&fd->refst) + n, reason, file, line); |
| 269 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 270 | #else |
| 271 | #define REF_BY(fd, n, reason) ref_by(fd, n) |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 272 | #define UNREF_BY(ec, fd, n, reason) unref_by(ec, fd, n) |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 273 | static void ref_by(grpc_fd* fd, int n) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 274 | #endif |
| 275 | GPR_ASSERT(gpr_atm_no_barrier_fetch_add(&fd->refst, n) > 0); |
| 276 | } |
| 277 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 278 | static void fd_destroy(grpc_exec_ctx* exec_ctx, void* arg, grpc_error* error) { |
| 279 | grpc_fd* fd = (grpc_fd*)arg; |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 280 | /* Add the fd to the freelist */ |
| 281 | grpc_iomgr_unregister_object(&fd->iomgr_object); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 282 | POLLABLE_UNREF(fd->pollable_obj, "fd_pollable"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 283 | gpr_mu_destroy(&fd->pollable_mu); |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 284 | gpr_mu_destroy(&fd->orphan_mu); |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 285 | gpr_mu_lock(&fd_freelist_mu); |
| 286 | fd->freelist_next = fd_freelist; |
| 287 | fd_freelist = fd; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 288 | |
yang-g | ed49fe5 | 2017-11-20 13:49:54 -0800 | [diff] [blame] | 289 | fd->read_closure->DestroyEvent(); |
| 290 | fd->write_closure->DestroyEvent(); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 291 | |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 292 | gpr_mu_unlock(&fd_freelist_mu); |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 293 | } |
| 294 | |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 295 | #ifndef NDEBUG |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 296 | static void unref_by(grpc_exec_ctx* exec_ctx, grpc_fd* fd, int n, |
| 297 | const char* reason, const char* file, int line) { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 298 | if (grpc_trace_fd_refcount.enabled()) { |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 299 | gpr_log(GPR_DEBUG, |
| 300 | "FD %d %p unref %d %" PRIdPTR " -> %" PRIdPTR " [%s; %s:%d]", |
| 301 | fd->fd, fd, n, gpr_atm_no_barrier_load(&fd->refst), |
| 302 | gpr_atm_no_barrier_load(&fd->refst) - n, reason, file, line); |
| 303 | } |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 304 | #else |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 305 | static void unref_by(grpc_exec_ctx* exec_ctx, grpc_fd* fd, int n) { |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 306 | #endif |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 307 | gpr_atm old = gpr_atm_full_fetch_add(&fd->refst, -n); |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 308 | if (old == n) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 309 | GRPC_CLOSURE_SCHED( |
| 310 | exec_ctx, |
| 311 | GRPC_CLOSURE_CREATE(fd_destroy, fd, grpc_schedule_on_exec_ctx), |
| 312 | GRPC_ERROR_NONE); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 313 | } else { |
| 314 | GPR_ASSERT(old > n); |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | static void fd_global_init(void) { gpr_mu_init(&fd_freelist_mu); } |
| 319 | |
| 320 | static void fd_global_shutdown(void) { |
| 321 | gpr_mu_lock(&fd_freelist_mu); |
| 322 | gpr_mu_unlock(&fd_freelist_mu); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 323 | while (fd_freelist != nullptr) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 324 | grpc_fd* fd = fd_freelist; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 325 | fd_freelist = fd_freelist->freelist_next; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 326 | gpr_free(fd); |
| 327 | } |
| 328 | gpr_mu_destroy(&fd_freelist_mu); |
| 329 | } |
| 330 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 331 | static grpc_fd* fd_create(int fd, const char* name) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 332 | grpc_fd* new_fd = nullptr; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 333 | |
| 334 | gpr_mu_lock(&fd_freelist_mu); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 335 | if (fd_freelist != nullptr) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 336 | new_fd = fd_freelist; |
| 337 | fd_freelist = fd_freelist->freelist_next; |
| 338 | } |
| 339 | gpr_mu_unlock(&fd_freelist_mu); |
| 340 | |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 341 | if (new_fd == nullptr) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 342 | new_fd = (grpc_fd*)gpr_malloc(sizeof(grpc_fd)); |
yang-g | 26521b3 | 2017-11-17 17:15:37 -0800 | [diff] [blame] | 343 | new_fd->read_closure.Init(); |
| 344 | new_fd->write_closure.Init(); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 345 | } |
| 346 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 347 | gpr_mu_init(&new_fd->pollable_mu); |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 348 | gpr_mu_init(&new_fd->orphan_mu); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 349 | new_fd->pollable_obj = nullptr; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 350 | gpr_atm_rel_store(&new_fd->refst, (gpr_atm)1); |
| 351 | new_fd->fd = fd; |
yang-g | ed49fe5 | 2017-11-20 13:49:54 -0800 | [diff] [blame] | 352 | new_fd->read_closure->InitEvent(); |
| 353 | new_fd->write_closure->InitEvent(); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 354 | gpr_atm_no_barrier_store(&new_fd->read_notifier_pollset, (gpr_atm)NULL); |
| 355 | |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 356 | new_fd->freelist_next = nullptr; |
| 357 | new_fd->on_done_closure = nullptr; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 358 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 359 | char* fd_name; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 360 | gpr_asprintf(&fd_name, "%s fd=%d", name, fd); |
| 361 | grpc_iomgr_register_object(&new_fd->iomgr_object, fd_name); |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 362 | #ifndef NDEBUG |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 363 | if (grpc_trace_fd_refcount.enabled()) { |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 364 | gpr_log(GPR_DEBUG, "FD %d %p create %s", fd, new_fd, fd_name); |
| 365 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 366 | #endif |
| 367 | gpr_free(fd_name); |
| 368 | return new_fd; |
| 369 | } |
| 370 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 371 | static int fd_wrapped_fd(grpc_fd* fd) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 372 | int ret_fd = fd->fd; |
| 373 | return (gpr_atm_acq_load(&fd->refst) & 1) ? ret_fd : -1; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 374 | } |
| 375 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 376 | static void fd_orphan(grpc_exec_ctx* exec_ctx, grpc_fd* fd, |
| 377 | grpc_closure* on_done, int* release_fd, |
| 378 | bool already_closed, const char* reason) { |
Yuchen Zeng | d40a7ae | 2017-07-12 15:59:56 -0700 | [diff] [blame] | 379 | bool is_fd_closed = already_closed; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 380 | |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 381 | gpr_mu_lock(&fd->orphan_mu); |
| 382 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 383 | fd->on_done_closure = on_done; |
| 384 | |
| 385 | /* If release_fd is not NULL, we should be relinquishing control of the file |
| 386 | descriptor fd->fd (but we still own the grpc_fd structure). */ |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 387 | if (release_fd != nullptr) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 388 | *release_fd = fd->fd; |
Yuchen Zeng | d40a7ae | 2017-07-12 15:59:56 -0700 | [diff] [blame] | 389 | } else if (!is_fd_closed) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 390 | close(fd->fd); |
| 391 | is_fd_closed = true; |
| 392 | } |
| 393 | |
Craig Tiller | f4360d7 | 2017-04-07 08:51:00 -0700 | [diff] [blame] | 394 | if (!is_fd_closed) { |
| 395 | gpr_log(GPR_DEBUG, "TODO: handle fd removal?"); |
| 396 | } |
| 397 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 398 | /* Remove the active status but keep referenced. We want this grpc_fd struct |
| 399 | to be alive (and not added to freelist) until the end of this function */ |
| 400 | REF_BY(fd, 1, reason); |
| 401 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 402 | GRPC_CLOSURE_SCHED(exec_ctx, fd->on_done_closure, GRPC_ERROR_NONE); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 403 | |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 404 | gpr_mu_unlock(&fd->orphan_mu); |
| 405 | |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 406 | UNREF_BY(exec_ctx, fd, 2, reason); /* Drop the reference */ |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 407 | } |
| 408 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 409 | static grpc_pollset* fd_get_read_notifier_pollset(grpc_exec_ctx* exec_ctx, |
| 410 | grpc_fd* fd) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 411 | gpr_atm notifier = gpr_atm_acq_load(&fd->read_notifier_pollset); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 412 | return (grpc_pollset*)notifier; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 413 | } |
| 414 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 415 | static bool fd_is_shutdown(grpc_fd* fd) { |
Craig Tiller | fbf61bb | 2017-11-08 11:50:14 -0800 | [diff] [blame] | 416 | return fd->read_closure->IsShutdown(); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 417 | } |
| 418 | |
| 419 | /* Might be called multiple times */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 420 | static void fd_shutdown(grpc_exec_ctx* exec_ctx, grpc_fd* fd, grpc_error* why) { |
Craig Tiller | fbf61bb | 2017-11-08 11:50:14 -0800 | [diff] [blame] | 421 | if (fd->read_closure->SetShutdown(exec_ctx, GRPC_ERROR_REF(why))) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 422 | shutdown(fd->fd, SHUT_RDWR); |
Craig Tiller | fbf61bb | 2017-11-08 11:50:14 -0800 | [diff] [blame] | 423 | fd->write_closure->SetShutdown(exec_ctx, GRPC_ERROR_REF(why)); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 424 | } |
| 425 | GRPC_ERROR_UNREF(why); |
| 426 | } |
| 427 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 428 | static void fd_notify_on_read(grpc_exec_ctx* exec_ctx, grpc_fd* fd, |
| 429 | grpc_closure* closure) { |
Craig Tiller | fbf61bb | 2017-11-08 11:50:14 -0800 | [diff] [blame] | 430 | fd->read_closure->NotifyOn(exec_ctx, closure); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 431 | } |
| 432 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 433 | static void fd_notify_on_write(grpc_exec_ctx* exec_ctx, grpc_fd* fd, |
| 434 | grpc_closure* closure) { |
Craig Tiller | fbf61bb | 2017-11-08 11:50:14 -0800 | [diff] [blame] | 435 | fd->write_closure->NotifyOn(exec_ctx, closure); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 436 | } |
| 437 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 438 | /******************************************************************************* |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 439 | * Pollable Definitions |
| 440 | */ |
| 441 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 442 | static grpc_error* pollable_create(pollable_type type, pollable** p) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 443 | *p = nullptr; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 444 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 445 | int epfd = epoll_create1(EPOLL_CLOEXEC); |
| 446 | if (epfd == -1) { |
| 447 | return GRPC_OS_ERROR(errno, "epoll_create1"); |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 448 | } |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 449 | *p = (pollable*)gpr_malloc(sizeof(**p)); |
| 450 | grpc_error* err = grpc_wakeup_fd_init(&(*p)->wakeup); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 451 | if (err != GRPC_ERROR_NONE) { |
| 452 | close(epfd); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 453 | gpr_free(*p); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 454 | *p = nullptr; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 455 | return err; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 456 | } |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 457 | struct epoll_event ev; |
| 458 | ev.events = (uint32_t)(EPOLLIN | EPOLLET); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 459 | ev.data.ptr = (void*)(1 | (intptr_t) & (*p)->wakeup); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 460 | if (epoll_ctl(epfd, EPOLL_CTL_ADD, (*p)->wakeup.read_fd, &ev) != 0) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 461 | err = GRPC_OS_ERROR(errno, "epoll_ctl"); |
| 462 | close(epfd); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 463 | grpc_wakeup_fd_destroy(&(*p)->wakeup); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 464 | gpr_free(*p); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 465 | *p = nullptr; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 466 | return err; |
| 467 | } |
| 468 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 469 | (*p)->type = type; |
| 470 | gpr_ref_init(&(*p)->refs, 1); |
Craig Tiller | 65da0ef | 2017-10-02 15:35:59 -0700 | [diff] [blame] | 471 | gpr_mu_init(&(*p)->mu); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 472 | (*p)->epfd = epfd; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 473 | (*p)->owner_fd = nullptr; |
| 474 | (*p)->pollset_set = nullptr; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 475 | (*p)->next = (*p)->prev = *p; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 476 | (*p)->root_worker = nullptr; |
Craig Tiller | e29196b | 2017-10-18 19:52:33 +0000 | [diff] [blame] | 477 | (*p)->event_cursor = 0; |
| 478 | (*p)->event_count = 0; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 479 | return GRPC_ERROR_NONE; |
| 480 | } |
| 481 | |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 482 | #ifdef NDEBUG |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 483 | static pollable* pollable_ref(pollable* p) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 484 | #else |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 485 | static pollable* pollable_ref(pollable* p, int line, const char* reason) { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 486 | if (grpc_trace_pollable_refcount.enabled()) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 487 | int r = (int)gpr_atm_no_barrier_load(&p->refs.count); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 488 | gpr_log(__FILE__, line, GPR_LOG_SEVERITY_DEBUG, |
| 489 | "POLLABLE:%p ref %d->%d %s", p, r, r + 1, reason); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 490 | } |
| 491 | #endif |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 492 | gpr_ref(&p->refs); |
| 493 | return p; |
| 494 | } |
| 495 | |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 496 | #ifdef NDEBUG |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 497 | static void pollable_unref(pollable* p) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 498 | #else |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 499 | static void pollable_unref(pollable* p, int line, const char* reason) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 500 | if (p == nullptr) return; |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 501 | if (grpc_trace_pollable_refcount.enabled()) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 502 | int r = (int)gpr_atm_no_barrier_load(&p->refs.count); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 503 | gpr_log(__FILE__, line, GPR_LOG_SEVERITY_DEBUG, |
| 504 | "POLLABLE:%p unref %d->%d %s", p, r, r - 1, reason); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 505 | } |
| 506 | #endif |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 507 | if (p != nullptr && gpr_unref(&p->refs)) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 508 | close(p->epfd); |
| 509 | grpc_wakeup_fd_destroy(&p->wakeup); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 510 | gpr_free(p); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 511 | } |
| 512 | } |
| 513 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 514 | static grpc_error* pollable_add_fd(pollable* p, grpc_fd* fd) { |
| 515 | grpc_error* error = GRPC_ERROR_NONE; |
| 516 | static const char* err_desc = "pollable_add_fd"; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 517 | const int epfd = p->epfd; |
| 518 | |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 519 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 520 | gpr_log(GPR_DEBUG, "add fd %p (%d) to pollable %p", fd, fd->fd, p); |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 521 | } |
| 522 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 523 | struct epoll_event ev_fd; |
| 524 | ev_fd.events = (uint32_t)(EPOLLET | EPOLLIN | EPOLLOUT | EPOLLEXCLUSIVE); |
| 525 | ev_fd.data.ptr = fd; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 526 | if (epoll_ctl(epfd, EPOLL_CTL_ADD, fd->fd, &ev_fd) != 0) { |
| 527 | switch (errno) { |
Craig Tiller | 61f96c1 | 2017-05-12 13:36:39 -0700 | [diff] [blame] | 528 | case EEXIST: |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 529 | break; |
| 530 | default: |
| 531 | append_error(&error, GRPC_OS_ERROR(errno, "epoll_ctl"), err_desc); |
| 532 | } |
| 533 | } |
| 534 | |
| 535 | return error; |
| 536 | } |
| 537 | |
| 538 | /******************************************************************************* |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 539 | * Pollset Definitions |
| 540 | */ |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 541 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 542 | GPR_TLS_DECL(g_current_thread_pollset); |
| 543 | GPR_TLS_DECL(g_current_thread_worker); |
| 544 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 545 | /* Global state management */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 546 | static grpc_error* pollset_global_init(void) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 547 | gpr_tls_init(&g_current_thread_pollset); |
| 548 | gpr_tls_init(&g_current_thread_worker); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 549 | return pollable_create(PO_EMPTY, &g_empty_pollable); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 550 | } |
| 551 | |
| 552 | static void pollset_global_shutdown(void) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 553 | POLLABLE_UNREF(g_empty_pollable, "g_empty_pollable"); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 554 | gpr_tls_destroy(&g_current_thread_pollset); |
| 555 | gpr_tls_destroy(&g_current_thread_worker); |
| 556 | } |
| 557 | |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 558 | /* pollset->mu must be held while calling this function */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 559 | static void pollset_maybe_finish_shutdown(grpc_exec_ctx* exec_ctx, |
| 560 | grpc_pollset* pollset) { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 561 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | b653dff | 2017-10-16 14:38:36 -0700 | [diff] [blame] | 562 | gpr_log(GPR_DEBUG, |
| 563 | "PS:%p (pollable:%p) maybe_finish_shutdown sc=%p (target:!NULL) " |
| 564 | "rw=%p (target:NULL) cpsc=%d (target:0)", |
| 565 | pollset, pollset->active_pollable, pollset->shutdown_closure, |
| 566 | pollset->root_worker, pollset->containing_pollset_set_count); |
| 567 | } |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 568 | if (pollset->shutdown_closure != nullptr && pollset->root_worker == nullptr && |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame] | 569 | pollset->containing_pollset_set_count == 0) { |
Craig Tiller | ca669b0 | 2017-06-09 12:41:51 -0700 | [diff] [blame] | 570 | GRPC_CLOSURE_SCHED(exec_ctx, pollset->shutdown_closure, GRPC_ERROR_NONE); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 571 | pollset->shutdown_closure = nullptr; |
Craig Tiller | e16722c | 2017-05-17 21:50:37 +0000 | [diff] [blame] | 572 | } |
| 573 | } |
| 574 | |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame] | 575 | /* pollset->mu must be held before calling this function, |
| 576 | * pollset->active_pollable->mu & specific_worker->pollable_obj->mu must not be |
| 577 | * held */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 578 | static grpc_error* kick_one_worker(grpc_exec_ctx* exec_ctx, |
| 579 | grpc_pollset_worker* specific_worker) { |
| 580 | pollable* p = specific_worker->pollable_obj; |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 581 | grpc_core::mu_guard lock(&p->mu); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 582 | GPR_ASSERT(specific_worker != nullptr); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 583 | if (specific_worker->kicked) { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 584 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | d37d142 | 2017-04-18 19:41:07 +0000 | [diff] [blame] | 585 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_but_already_kicked", p); |
| 586 | } |
Craig Tiller | 9763374 | 2017-10-15 15:34:40 -0700 | [diff] [blame] | 587 | GRPC_STATS_INC_POLLSET_KICKED_AGAIN(exec_ctx); |
Craig Tiller | d37d142 | 2017-04-18 19:41:07 +0000 | [diff] [blame] | 588 | return GRPC_ERROR_NONE; |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 589 | } |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame] | 590 | if (gpr_tls_get(&g_current_thread_worker) == (intptr_t)specific_worker) { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 591 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 592 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_but_awake", p); |
Craig Tiller | 1ad9477 | 2017-04-11 16:15:19 +0000 | [diff] [blame] | 593 | } |
Craig Tiller | 9763374 | 2017-10-15 15:34:40 -0700 | [diff] [blame] | 594 | GRPC_STATS_INC_POLLSET_KICK_OWN_THREAD(exec_ctx); |
Craig Tiller | d37d142 | 2017-04-18 19:41:07 +0000 | [diff] [blame] | 595 | specific_worker->kicked = true; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 596 | return GRPC_ERROR_NONE; |
Craig Tiller | 9763374 | 2017-10-15 15:34:40 -0700 | [diff] [blame] | 597 | } |
| 598 | if (specific_worker == p->root_worker) { |
| 599 | GRPC_STATS_INC_POLLSET_KICK_WAKEUP_FD(exec_ctx); |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 600 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 601 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_via_wakeup_fd", p); |
Craig Tiller | 1ad9477 | 2017-04-11 16:15:19 +0000 | [diff] [blame] | 602 | } |
Craig Tiller | d37d142 | 2017-04-18 19:41:07 +0000 | [diff] [blame] | 603 | specific_worker->kicked = true; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 604 | grpc_error* error = grpc_wakeup_fd_wakeup(&p->wakeup); |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 605 | return error; |
| 606 | } |
Craig Tiller | 9763374 | 2017-10-15 15:34:40 -0700 | [diff] [blame] | 607 | if (specific_worker->initialized_cv) { |
| 608 | GRPC_STATS_INC_POLLSET_KICK_WAKEUP_CV(exec_ctx); |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 609 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 610 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_via_cv", p); |
Craig Tiller | 1ad9477 | 2017-04-11 16:15:19 +0000 | [diff] [blame] | 611 | } |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 612 | specific_worker->kicked = true; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 613 | gpr_cv_signal(&specific_worker->cv); |
| 614 | return GRPC_ERROR_NONE; |
| 615 | } |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame] | 616 | // we can get here during end_worker after removing specific_worker from the |
| 617 | // pollable list but before removing it from the pollset list |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 618 | return GRPC_ERROR_NONE; |
Craig Tiller | 26017de | 2017-04-15 00:07:25 +0000 | [diff] [blame] | 619 | } |
| 620 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 621 | static grpc_error* pollset_kick(grpc_exec_ctx* exec_ctx, grpc_pollset* pollset, |
| 622 | grpc_pollset_worker* specific_worker) { |
ncteisen | 0961509 | 2017-10-31 17:48:01 -0700 | [diff] [blame] | 623 | GRPC_STATS_INC_POLLSET_KICK(exec_ctx); |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 624 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 625 | gpr_log(GPR_DEBUG, |
Craig Tiller | 3d073c2 | 2017-10-04 22:10:58 +0000 | [diff] [blame] | 626 | "PS:%p kick %p tls_pollset=%p tls_worker=%p pollset.root_worker=%p", |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 627 | pollset, specific_worker, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 628 | (void*)gpr_tls_get(&g_current_thread_pollset), |
| 629 | (void*)gpr_tls_get(&g_current_thread_worker), pollset->root_worker); |
Craig Tiller | 26017de | 2017-04-15 00:07:25 +0000 | [diff] [blame] | 630 | } |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 631 | if (specific_worker == nullptr) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 632 | if (gpr_tls_get(&g_current_thread_pollset) != (intptr_t)pollset) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 633 | if (pollset->root_worker == nullptr) { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 634 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 3d073c2 | 2017-10-04 22:10:58 +0000 | [diff] [blame] | 635 | gpr_log(GPR_DEBUG, "PS:%p kicked_any_without_poller", pollset); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 636 | } |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 637 | GRPC_STATS_INC_POLLSET_KICKED_WITHOUT_POLLER(exec_ctx); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 638 | pollset->kicked_without_poller = true; |
| 639 | return GRPC_ERROR_NONE; |
| 640 | } else { |
Craig Tiller | 7c8e59d | 2017-10-18 11:57:25 -0700 | [diff] [blame] | 641 | // We've been asked to kick a poller, but we haven't been told which one |
| 642 | // ... any will do |
| 643 | // We look at the pollset worker list because: |
| 644 | // 1. the pollable list may include workers from other pollers, so we'd |
| 645 | // need to do an O(N) search |
| 646 | // 2. we'd additionally need to take the pollable lock, which we've so |
| 647 | // far avoided |
| 648 | // Now, we would prefer to wake a poller in cv_wait, and not in |
| 649 | // epoll_wait (since the latter would imply the need to do an additional |
| 650 | // wakeup) |
| 651 | // We know that if a worker is at the root of a pollable, it's (likely) |
| 652 | // also the root of a pollset, and we know that if a worker is NOT at |
| 653 | // the root of a pollset, it's (likely) not at the root of a pollable, |
| 654 | // so we take our chances and choose the SECOND worker enqueued against |
| 655 | // the pollset as a worker that's likely to be in cv_wait |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 656 | return kick_one_worker( |
| 657 | exec_ctx, pollset->root_worker->links[PWLINK_POLLSET].next); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 658 | } |
| 659 | } else { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 660 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 3d073c2 | 2017-10-04 22:10:58 +0000 | [diff] [blame] | 661 | gpr_log(GPR_DEBUG, "PS:%p kicked_any_but_awake", pollset); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 662 | } |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 663 | GRPC_STATS_INC_POLLSET_KICK_OWN_THREAD(exec_ctx); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 664 | return GRPC_ERROR_NONE; |
| 665 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 666 | } else { |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 667 | return kick_one_worker(exec_ctx, specific_worker); |
Craig Tiller | 26017de | 2017-04-15 00:07:25 +0000 | [diff] [blame] | 668 | } |
| 669 | } |
| 670 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 671 | static grpc_error* pollset_kick_all(grpc_exec_ctx* exec_ctx, |
| 672 | grpc_pollset* pollset) { |
| 673 | grpc_error* error = GRPC_ERROR_NONE; |
| 674 | const char* err_desc = "pollset_kick_all"; |
| 675 | grpc_pollset_worker* w = pollset->root_worker; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 676 | if (w != nullptr) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 677 | do { |
ncteisen | 0961509 | 2017-10-31 17:48:01 -0700 | [diff] [blame] | 678 | GRPC_STATS_INC_POLLSET_KICK(exec_ctx); |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 679 | append_error(&error, kick_one_worker(exec_ctx, w), err_desc); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 680 | w = w->links[PWLINK_POLLSET].next; |
| 681 | } while (w != pollset->root_worker); |
Craig Tiller | 26017de | 2017-04-15 00:07:25 +0000 | [diff] [blame] | 682 | } |
| 683 | return error; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 684 | } |
| 685 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 686 | static void pollset_init(grpc_pollset* pollset, gpr_mu** mu) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 687 | gpr_mu_init(&pollset->mu); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 688 | pollset->active_pollable = POLLABLE_REF(g_empty_pollable, "pollset"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 689 | *mu = &pollset->mu; |
Craig Tiller | 9f01251 | 2017-04-13 15:37:14 -0700 | [diff] [blame] | 690 | } |
| 691 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 692 | static int poll_deadline_to_millis_timeout(grpc_exec_ctx* exec_ctx, |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 693 | grpc_millis millis) { |
| 694 | if (millis == GRPC_MILLIS_INF_FUTURE) return -1; |
| 695 | grpc_millis delta = millis - grpc_exec_ctx_now(exec_ctx); |
| 696 | if (delta > INT_MAX) |
| 697 | return INT_MAX; |
| 698 | else if (delta < 0) |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 699 | return 0; |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 700 | else |
| 701 | return (int)delta; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 702 | } |
| 703 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 704 | static void fd_become_readable(grpc_exec_ctx* exec_ctx, grpc_fd* fd, |
| 705 | grpc_pollset* notifier) { |
Craig Tiller | fbf61bb | 2017-11-08 11:50:14 -0800 | [diff] [blame] | 706 | fd->read_closure->SetReady(exec_ctx); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 707 | |
| 708 | /* Note, it is possible that fd_become_readable might be called twice with |
| 709 | different 'notifier's when an fd becomes readable and it is in two epoll |
| 710 | sets (This can happen briefly during polling island merges). In such cases |
| 711 | it does not really matter which notifer is set as the read_notifier_pollset |
| 712 | (They would both point to the same polling island anyway) */ |
| 713 | /* Use release store to match with acquire load in fd_get_read_notifier */ |
| 714 | gpr_atm_rel_store(&fd->read_notifier_pollset, (gpr_atm)notifier); |
| 715 | } |
| 716 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 717 | static void fd_become_writable(grpc_exec_ctx* exec_ctx, grpc_fd* fd) { |
Craig Tiller | fbf61bb | 2017-11-08 11:50:14 -0800 | [diff] [blame] | 718 | fd->write_closure->SetReady(exec_ctx); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 719 | } |
| 720 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 721 | static grpc_error* fd_get_or_become_pollable(grpc_fd* fd, pollable** p) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 722 | gpr_mu_lock(&fd->pollable_mu); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 723 | grpc_error* error = GRPC_ERROR_NONE; |
| 724 | static const char* err_desc = "fd_get_or_become_pollable"; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 725 | if (fd->pollable_obj == nullptr) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 726 | if (append_error(&error, pollable_create(PO_FD, &fd->pollable_obj), |
| 727 | err_desc)) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 728 | fd->pollable_obj->owner_fd = fd; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 729 | if (!append_error(&error, pollable_add_fd(fd->pollable_obj, fd), |
| 730 | err_desc)) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 731 | POLLABLE_UNREF(fd->pollable_obj, "fd_pollable"); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 732 | fd->pollable_obj = nullptr; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 733 | } |
| 734 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 735 | } |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 736 | if (error == GRPC_ERROR_NONE) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 737 | GPR_ASSERT(fd->pollable_obj != nullptr); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 738 | *p = POLLABLE_REF(fd->pollable_obj, "pollset"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 739 | } else { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 740 | GPR_ASSERT(fd->pollable_obj == nullptr); |
| 741 | *p = nullptr; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 742 | } |
| 743 | gpr_mu_unlock(&fd->pollable_mu); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 744 | return error; |
| 745 | } |
| 746 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 747 | /* pollset->po.mu lock must be held by the caller before calling this */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 748 | static void pollset_shutdown(grpc_exec_ctx* exec_ctx, grpc_pollset* pollset, |
| 749 | grpc_closure* closure) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 750 | GPR_ASSERT(pollset->shutdown_closure == nullptr); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 751 | pollset->shutdown_closure = closure; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 752 | GRPC_LOG_IF_ERROR("pollset_shutdown", pollset_kick_all(exec_ctx, pollset)); |
Craig Tiller | d9cd8f0 | 2017-04-07 16:26:02 -0700 | [diff] [blame] | 753 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 754 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 755 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 756 | static grpc_error* pollable_process_events(grpc_exec_ctx* exec_ctx, |
| 757 | grpc_pollset* pollset, |
| 758 | pollable* pollable_obj, bool drain) { |
| 759 | static const char* err_desc = "pollset_process_events"; |
| 760 | grpc_error* error = GRPC_ERROR_NONE; |
Craig Tiller | ca4fc66 | 2017-06-09 11:13:56 -0700 | [diff] [blame] | 761 | for (int i = 0; (drain || i < MAX_EPOLL_EVENTS_HANDLED_EACH_POLL_CALL) && |
Craig Tiller | 8223f41 | 2017-10-17 22:05:55 +0000 | [diff] [blame] | 762 | pollable_obj->event_cursor != pollable_obj->event_count; |
Craig Tiller | ca4fc66 | 2017-06-09 11:13:56 -0700 | [diff] [blame] | 763 | i++) { |
Craig Tiller | 8223f41 | 2017-10-17 22:05:55 +0000 | [diff] [blame] | 764 | int n = pollable_obj->event_cursor++; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 765 | struct epoll_event* ev = &pollable_obj->events[n]; |
| 766 | void* data_ptr = ev->data.ptr; |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 767 | if (1 & (intptr_t)data_ptr) { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 768 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 769 | gpr_log(GPR_DEBUG, "PS:%p got pollset_wakeup %p", pollset, data_ptr); |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 770 | } |
Yash Tibrewal | 52778c4 | 2017-09-11 15:00:11 -0700 | [diff] [blame] | 771 | append_error(&error, |
| 772 | grpc_wakeup_fd_consume_wakeup( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 773 | (grpc_wakeup_fd*)((~(intptr_t)1) & (intptr_t)data_ptr)), |
Craig Tiller | 9bedddd | 2017-06-08 17:05:00 -0700 | [diff] [blame] | 774 | err_desc); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 775 | } else { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 776 | grpc_fd* fd = (grpc_fd*)data_ptr; |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 777 | bool cancel = (ev->events & (EPOLLERR | EPOLLHUP)) != 0; |
| 778 | bool read_ev = (ev->events & (EPOLLIN | EPOLLPRI)) != 0; |
| 779 | bool write_ev = (ev->events & EPOLLOUT) != 0; |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 780 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 781 | gpr_log(GPR_DEBUG, |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 782 | "PS:%p got fd %p: cancel=%d read=%d " |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 783 | "write=%d", |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 784 | pollset, fd, cancel, read_ev, write_ev); |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 785 | } |
Craig Tiller | 61f96c1 | 2017-05-12 13:36:39 -0700 | [diff] [blame] | 786 | if (read_ev || cancel) { |
| 787 | fd_become_readable(exec_ctx, fd, pollset); |
| 788 | } |
| 789 | if (write_ev || cancel) { |
| 790 | fd_become_writable(exec_ctx, fd); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 791 | } |
| 792 | } |
| 793 | } |
| 794 | |
| 795 | return error; |
| 796 | } |
| 797 | |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 798 | /* pollset_shutdown is guaranteed to be called before pollset_destroy. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 799 | static void pollset_destroy(grpc_exec_ctx* exec_ctx, grpc_pollset* pollset) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 800 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 801 | pollset->active_pollable = nullptr; |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 802 | } |
| 803 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 804 | static grpc_error* pollable_epoll(grpc_exec_ctx* exec_ctx, pollable* p, |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 805 | grpc_millis deadline) { |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 806 | int timeout = poll_deadline_to_millis_timeout(exec_ctx, deadline); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 807 | |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 808 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 809 | char* desc = pollable_desc(p); |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 810 | gpr_log(GPR_DEBUG, "POLLABLE:%p[%s] poll for %dms", p, desc, timeout); |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 811 | gpr_free(desc); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 812 | } |
| 813 | |
| 814 | if (timeout != 0) { |
| 815 | GRPC_SCHEDULING_START_BLOCKING_REGION; |
| 816 | } |
| 817 | int r; |
| 818 | do { |
Craig Tiller | b4bb1cd | 2017-07-20 14:18:17 -0700 | [diff] [blame] | 819 | GRPC_STATS_INC_SYSCALL_POLL(exec_ctx); |
Craig Tiller | 8223f41 | 2017-10-17 22:05:55 +0000 | [diff] [blame] | 820 | r = epoll_wait(p->epfd, p->events, MAX_EPOLL_EVENTS, timeout); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 821 | } while (r < 0 && errno == EINTR); |
| 822 | if (timeout != 0) { |
Craig Tiller | 781e91a | 2017-07-17 16:21:00 -0700 | [diff] [blame] | 823 | GRPC_SCHEDULING_END_BLOCKING_REGION_WITH_EXEC_CTX(exec_ctx); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 824 | } |
| 825 | |
| 826 | if (r < 0) return GRPC_OS_ERROR(errno, "epoll_wait"); |
| 827 | |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 828 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 829 | gpr_log(GPR_DEBUG, "POLLABLE:%p got %d events", p, r); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 830 | } |
| 831 | |
Craig Tiller | 8223f41 | 2017-10-17 22:05:55 +0000 | [diff] [blame] | 832 | p->event_cursor = 0; |
| 833 | p->event_count = r; |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 834 | |
| 835 | return GRPC_ERROR_NONE; |
| 836 | } |
| 837 | |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 838 | /* Return true if first in list */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 839 | static bool worker_insert(grpc_pollset_worker** root_worker, |
| 840 | grpc_pollset_worker* worker, pwlinks link) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 841 | if (*root_worker == nullptr) { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 842 | *root_worker = worker; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 843 | worker->links[link].next = worker->links[link].prev = worker; |
| 844 | return true; |
| 845 | } else { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 846 | worker->links[link].next = *root_worker; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 847 | worker->links[link].prev = worker->links[link].next->links[link].prev; |
| 848 | worker->links[link].next->links[link].prev = worker; |
| 849 | worker->links[link].prev->links[link].next = worker; |
| 850 | return false; |
| 851 | } |
| 852 | } |
| 853 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 854 | /* returns the new root IFF the root changed */ |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 855 | typedef enum { WRR_NEW_ROOT, WRR_EMPTIED, WRR_REMOVED } worker_remove_result; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 856 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 857 | static worker_remove_result worker_remove(grpc_pollset_worker** root_worker, |
| 858 | grpc_pollset_worker* worker, |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 859 | pwlinks link) { |
| 860 | if (worker == *root_worker) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 861 | if (worker == worker->links[link].next) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 862 | *root_worker = nullptr; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 863 | return WRR_EMPTIED; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 864 | } else { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 865 | *root_worker = worker->links[link].next; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 866 | worker->links[link].prev->links[link].next = worker->links[link].next; |
| 867 | worker->links[link].next->links[link].prev = worker->links[link].prev; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 868 | return WRR_NEW_ROOT; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 869 | } |
| 870 | } else { |
| 871 | worker->links[link].prev->links[link].next = worker->links[link].next; |
| 872 | worker->links[link].next->links[link].prev = worker->links[link].prev; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 873 | return WRR_REMOVED; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 874 | } |
| 875 | } |
| 876 | |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 877 | /* Return true if this thread should poll */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 878 | static bool begin_worker(grpc_exec_ctx* exec_ctx, grpc_pollset* pollset, |
| 879 | grpc_pollset_worker* worker, |
| 880 | grpc_pollset_worker** worker_hdl, |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 881 | grpc_millis deadline) { |
Craig Tiller | 8223f41 | 2017-10-17 22:05:55 +0000 | [diff] [blame] | 882 | bool do_poll = (pollset->shutdown_closure == nullptr); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 883 | if (worker_hdl != nullptr) *worker_hdl = worker; |
Craig Tiller | 9f01251 | 2017-04-13 15:37:14 -0700 | [diff] [blame] | 884 | worker->initialized_cv = false; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 885 | worker->kicked = false; |
| 886 | worker->pollset = pollset; |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 887 | worker->pollable_obj = |
| 888 | POLLABLE_REF(pollset->active_pollable, "pollset_worker"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 889 | worker_insert(&pollset->root_worker, worker, PWLINK_POLLSET); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 890 | gpr_mu_lock(&worker->pollable_obj->mu); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 891 | if (!worker_insert(&worker->pollable_obj->root_worker, worker, |
| 892 | PWLINK_POLLABLE)) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 893 | worker->initialized_cv = true; |
| 894 | gpr_cv_init(&worker->cv); |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 895 | gpr_mu_unlock(&pollset->mu); |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 896 | if (grpc_polling_trace.enabled() && |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 897 | worker->pollable_obj->root_worker != worker) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 898 | gpr_log(GPR_DEBUG, "PS:%p wait %p w=%p for %dms", pollset, |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 899 | worker->pollable_obj, worker, |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 900 | poll_deadline_to_millis_timeout(exec_ctx, deadline)); |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 901 | } |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 902 | while (do_poll && worker->pollable_obj->root_worker != worker) { |
Craig Tiller | 6b9a99c | 2017-10-12 00:27:00 +0000 | [diff] [blame] | 903 | if (gpr_cv_wait(&worker->cv, &worker->pollable_obj->mu, |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 904 | grpc_millis_to_timespec(deadline, GPR_CLOCK_REALTIME))) { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 905 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 906 | gpr_log(GPR_DEBUG, "PS:%p timeout_wait %p w=%p", pollset, |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 907 | worker->pollable_obj, worker); |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 908 | } |
| 909 | do_poll = false; |
| 910 | } else if (worker->kicked) { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 911 | if (grpc_polling_trace.enabled()) { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 912 | gpr_log(GPR_DEBUG, "PS:%p wakeup %p w=%p", pollset, |
| 913 | worker->pollable_obj, worker); |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 914 | } |
| 915 | do_poll = false; |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 916 | } else if (grpc_polling_trace.enabled() && |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 917 | worker->pollable_obj->root_worker != worker) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 918 | gpr_log(GPR_DEBUG, "PS:%p spurious_wakeup %p w=%p", pollset, |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 919 | worker->pollable_obj, worker); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 920 | } |
| 921 | } |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 922 | grpc_exec_ctx_invalidate_now(exec_ctx); |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 923 | } else { |
| 924 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 925 | } |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 926 | gpr_mu_unlock(&worker->pollable_obj->mu); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 927 | |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 928 | return do_poll; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 929 | } |
| 930 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 931 | static void end_worker(grpc_exec_ctx* exec_ctx, grpc_pollset* pollset, |
| 932 | grpc_pollset_worker* worker, |
| 933 | grpc_pollset_worker** worker_hdl) { |
Craig Tiller | 8223f41 | 2017-10-17 22:05:55 +0000 | [diff] [blame] | 934 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 935 | gpr_mu_lock(&worker->pollable_obj->mu); |
Craig Tiller | 8223f41 | 2017-10-17 22:05:55 +0000 | [diff] [blame] | 936 | switch (worker_remove(&worker->pollable_obj->root_worker, worker, |
Craig Tiller | 96e2470 | 2017-10-17 15:06:46 -0700 | [diff] [blame] | 937 | PWLINK_POLLABLE)) { |
| 938 | case WRR_NEW_ROOT: { |
Craig Tiller | 8223f41 | 2017-10-17 22:05:55 +0000 | [diff] [blame] | 939 | // wakeup new poller |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 940 | grpc_pollset_worker* new_root = worker->pollable_obj->root_worker; |
Craig Tiller | 8223f41 | 2017-10-17 22:05:55 +0000 | [diff] [blame] | 941 | GPR_ASSERT(new_root->initialized_cv); |
| 942 | gpr_cv_signal(&new_root->cv); |
| 943 | break; |
| 944 | } |
Craig Tiller | 96e2470 | 2017-10-17 15:06:46 -0700 | [diff] [blame] | 945 | case WRR_EMPTIED: |
| 946 | if (pollset->active_pollable != worker->pollable_obj) { |
| 947 | // pollable no longer being polled: flush events |
| 948 | pollable_process_events(exec_ctx, pollset, worker->pollable_obj, true); |
| 949 | } |
| 950 | break; |
| 951 | case WRR_REMOVED: |
| 952 | break; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 953 | } |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 954 | gpr_mu_unlock(&worker->pollable_obj->mu); |
| 955 | POLLABLE_UNREF(worker->pollable_obj, "pollset_worker"); |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame] | 956 | if (worker_remove(&pollset->root_worker, worker, PWLINK_POLLSET) == |
| 957 | WRR_EMPTIED) { |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 958 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 959 | } |
| 960 | if (worker->initialized_cv) { |
| 961 | gpr_cv_destroy(&worker->cv); |
| 962 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 963 | } |
| 964 | |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 965 | #ifndef NDEBUG |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 966 | static long gettid(void) { return syscall(__NR_gettid); } |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 967 | #endif |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 968 | |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 969 | /* pollset->mu lock must be held by the caller before calling this. |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 970 | The function pollset_work() may temporarily release the lock (pollset->po.mu) |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 971 | during the course of its execution but it will always re-acquire the lock and |
| 972 | ensure that it is held by the time the function returns */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 973 | static grpc_error* pollset_work(grpc_exec_ctx* exec_ctx, grpc_pollset* pollset, |
| 974 | grpc_pollset_worker** worker_hdl, |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 975 | grpc_millis deadline) { |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 976 | #ifdef GRPC_EPOLLEX_CREATE_WORKERS_ON_HEAP |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 977 | grpc_pollset_worker* worker = |
| 978 | (grpc_pollset_worker*)gpr_malloc(sizeof(*worker)); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 979 | #define WORKER_PTR (worker) |
| 980 | #else |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 981 | grpc_pollset_worker worker; |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 982 | #define WORKER_PTR (&worker) |
| 983 | #endif |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 984 | #ifndef NDEBUG |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 985 | WORKER_PTR->originator = gettid(); |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 986 | #endif |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 987 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 988 | gpr_log(GPR_DEBUG, |
| 989 | "PS:%p work hdl=%p worker=%p now=%" PRIdPTR " deadline=%" PRIdPTR |
| 990 | " kwp=%d pollable=%p", |
Craig Tiller | bfec10f | 2017-10-11 17:31:06 -0700 | [diff] [blame] | 991 | pollset, worker_hdl, WORKER_PTR, grpc_exec_ctx_now(exec_ctx), |
| 992 | deadline, pollset->kicked_without_poller, pollset->active_pollable); |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 993 | } |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 994 | static const char* err_desc = "pollset_work"; |
| 995 | grpc_error* error = GRPC_ERROR_NONE; |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 996 | if (pollset->kicked_without_poller) { |
| 997 | pollset->kicked_without_poller = false; |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 998 | } else { |
Craig Tiller | 6b9a99c | 2017-10-12 00:27:00 +0000 | [diff] [blame] | 999 | if (begin_worker(exec_ctx, pollset, WORKER_PTR, worker_hdl, deadline)) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1000 | gpr_tls_set(&g_current_thread_pollset, (intptr_t)pollset); |
| 1001 | gpr_tls_set(&g_current_thread_worker, (intptr_t)WORKER_PTR); |
Craig Tiller | 96e2470 | 2017-10-17 15:06:46 -0700 | [diff] [blame] | 1002 | if (WORKER_PTR->pollable_obj->event_cursor == |
| 1003 | WORKER_PTR->pollable_obj->event_count) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1004 | append_error( |
| 1005 | &error, |
| 1006 | pollable_epoll(exec_ctx, WORKER_PTR->pollable_obj, deadline), |
| 1007 | err_desc); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1008 | } |
Craig Tiller | 8223f41 | 2017-10-17 22:05:55 +0000 | [diff] [blame] | 1009 | append_error(&error, |
Craig Tiller | 96e2470 | 2017-10-17 15:06:46 -0700 | [diff] [blame] | 1010 | pollable_process_events(exec_ctx, pollset, |
| 1011 | WORKER_PTR->pollable_obj, false), |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 1012 | err_desc); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1013 | grpc_exec_ctx_flush(exec_ctx); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1014 | gpr_tls_set(&g_current_thread_pollset, 0); |
| 1015 | gpr_tls_set(&g_current_thread_worker, 0); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 1016 | } |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1017 | end_worker(exec_ctx, pollset, WORKER_PTR, worker_hdl); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 1018 | } |
| 1019 | #ifdef GRPC_EPOLLEX_CREATE_WORKERS_ON_HEAP |
| 1020 | gpr_free(worker); |
| 1021 | #endif |
Craig Tiller | 8223f41 | 2017-10-17 22:05:55 +0000 | [diff] [blame] | 1022 | #undef WORKER_PTR |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 1023 | return error; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1024 | } |
| 1025 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1026 | static grpc_error* pollset_transition_pollable_from_empty_to_fd_locked( |
| 1027 | grpc_exec_ctx* exec_ctx, grpc_pollset* pollset, grpc_fd* fd) { |
| 1028 | static const char* err_desc = "pollset_transition_pollable_from_empty_to_fd"; |
| 1029 | grpc_error* error = GRPC_ERROR_NONE; |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 1030 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1031 | gpr_log(GPR_DEBUG, |
| 1032 | "PS:%p add fd %p (%d); transition pollable from empty to fd", |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1033 | pollset, fd, fd->fd); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1034 | } |
| 1035 | append_error(&error, pollset_kick_all(exec_ctx, pollset), err_desc); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1036 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Craig Tiller | 5d9db0c | 2017-10-18 09:43:55 -0700 | [diff] [blame] | 1037 | append_error(&error, fd_get_or_become_pollable(fd, &pollset->active_pollable), |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1038 | err_desc); |
| 1039 | return error; |
| 1040 | } |
| 1041 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1042 | static grpc_error* pollset_transition_pollable_from_fd_to_multi_locked( |
| 1043 | grpc_exec_ctx* exec_ctx, grpc_pollset* pollset, grpc_fd* and_add_fd) { |
| 1044 | static const char* err_desc = "pollset_transition_pollable_from_fd_to_multi"; |
| 1045 | grpc_error* error = GRPC_ERROR_NONE; |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 1046 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1047 | gpr_log( |
| 1048 | GPR_DEBUG, |
| 1049 | "PS:%p add fd %p (%d); transition pollable from fd %p to multipoller", |
| 1050 | pollset, and_add_fd, and_add_fd ? and_add_fd->fd : -1, |
| 1051 | pollset->active_pollable->owner_fd); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1052 | } |
| 1053 | append_error(&error, pollset_kick_all(exec_ctx, pollset), err_desc); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1054 | grpc_fd* initial_fd = pollset->active_pollable->owner_fd; |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1055 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1056 | pollset->active_pollable = nullptr; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1057 | if (append_error(&error, pollable_create(PO_MULTI, &pollset->active_pollable), |
| 1058 | err_desc)) { |
| 1059 | append_error(&error, pollable_add_fd(pollset->active_pollable, initial_fd), |
| 1060 | err_desc); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1061 | if (and_add_fd != nullptr) { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1062 | append_error(&error, |
| 1063 | pollable_add_fd(pollset->active_pollable, and_add_fd), |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 1064 | err_desc); |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1065 | } |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 1066 | } |
| 1067 | return error; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 1068 | } |
Craig Tiller | e16722c | 2017-05-17 21:50:37 +0000 | [diff] [blame] | 1069 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1070 | /* expects pollsets locked, flag whether fd is locked or not */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1071 | static grpc_error* pollset_add_fd_locked(grpc_exec_ctx* exec_ctx, |
| 1072 | grpc_pollset* pollset, grpc_fd* fd) { |
| 1073 | grpc_error* error = GRPC_ERROR_NONE; |
| 1074 | pollable* po_at_start = |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1075 | POLLABLE_REF(pollset->active_pollable, "pollset_add_fd"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1076 | switch (pollset->active_pollable->type) { |
| 1077 | case PO_EMPTY: |
| 1078 | /* empty pollable --> single fd pollable */ |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1079 | error = pollset_transition_pollable_from_empty_to_fd_locked(exec_ctx, |
| 1080 | pollset, fd); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1081 | break; |
| 1082 | case PO_FD: |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1083 | gpr_mu_lock(&po_at_start->owner_fd->orphan_mu); |
Craig Tiller | d8d9f57 | 2017-10-04 16:10:23 -0700 | [diff] [blame] | 1084 | if ((gpr_atm_no_barrier_load(&pollset->active_pollable->owner_fd->refst) & |
| 1085 | 1) == 0) { |
| 1086 | error = pollset_transition_pollable_from_empty_to_fd_locked( |
| 1087 | exec_ctx, pollset, fd); |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1088 | } else { |
| 1089 | /* fd --> multipoller */ |
Craig Tiller | d8d9f57 | 2017-10-04 16:10:23 -0700 | [diff] [blame] | 1090 | error = pollset_transition_pollable_from_fd_to_multi_locked( |
| 1091 | exec_ctx, pollset, fd); |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1092 | } |
| 1093 | gpr_mu_unlock(&po_at_start->owner_fd->orphan_mu); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1094 | break; |
| 1095 | case PO_MULTI: |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1096 | error = pollable_add_fd(pollset->active_pollable, fd); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1097 | break; |
| 1098 | } |
| 1099 | if (error != GRPC_ERROR_NONE) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1100 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1101 | pollset->active_pollable = po_at_start; |
| 1102 | } else { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1103 | POLLABLE_UNREF(po_at_start, "pollset_add_fd"); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 1104 | } |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1105 | return error; |
| 1106 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 1107 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1108 | static grpc_error* pollset_as_multipollable_locked(grpc_exec_ctx* exec_ctx, |
| 1109 | grpc_pollset* pollset, |
| 1110 | pollable** pollable_obj) { |
| 1111 | grpc_error* error = GRPC_ERROR_NONE; |
| 1112 | pollable* po_at_start = |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1113 | POLLABLE_REF(pollset->active_pollable, "pollset_as_multipollable"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1114 | switch (pollset->active_pollable->type) { |
| 1115 | case PO_EMPTY: |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1116 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1117 | error = pollable_create(PO_MULTI, &pollset->active_pollable); |
| 1118 | break; |
| 1119 | case PO_FD: |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1120 | gpr_mu_lock(&po_at_start->owner_fd->orphan_mu); |
Craig Tiller | d8d9f57 | 2017-10-04 16:10:23 -0700 | [diff] [blame] | 1121 | if ((gpr_atm_no_barrier_load(&pollset->active_pollable->owner_fd->refst) & |
| 1122 | 1) == 0) { |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1123 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
| 1124 | error = pollable_create(PO_MULTI, &pollset->active_pollable); |
| 1125 | } else { |
| 1126 | error = pollset_transition_pollable_from_fd_to_multi_locked( |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1127 | exec_ctx, pollset, nullptr); |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1128 | } |
| 1129 | gpr_mu_unlock(&po_at_start->owner_fd->orphan_mu); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1130 | break; |
| 1131 | case PO_MULTI: |
| 1132 | break; |
| 1133 | } |
| 1134 | if (error != GRPC_ERROR_NONE) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1135 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1136 | pollset->active_pollable = po_at_start; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1137 | *pollable_obj = nullptr; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1138 | } else { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1139 | *pollable_obj = POLLABLE_REF(pollset->active_pollable, "pollset_set"); |
| 1140 | POLLABLE_UNREF(po_at_start, "pollset_as_multipollable"); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 1141 | } |
| 1142 | return error; |
| 1143 | } |
| 1144 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1145 | static void pollset_add_fd(grpc_exec_ctx* exec_ctx, grpc_pollset* pollset, |
| 1146 | grpc_fd* fd) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1147 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1148 | grpc_error* error = pollset_add_fd_locked(exec_ctx, pollset, fd); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1149 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 1150 | GRPC_LOG_IF_ERROR("pollset_add_fd", error); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1151 | } |
| 1152 | |
| 1153 | /******************************************************************************* |
| 1154 | * Pollset-set Definitions |
| 1155 | */ |
| 1156 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1157 | static grpc_pollset_set* pss_lock_adam(grpc_pollset_set* pss) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1158 | gpr_mu_lock(&pss->mu); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1159 | while (pss->parent != nullptr) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1160 | gpr_mu_unlock(&pss->mu); |
| 1161 | pss = pss->parent; |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1162 | gpr_mu_lock(&pss->mu); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1163 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1164 | return pss; |
| 1165 | } |
| 1166 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1167 | static grpc_pollset_set* pollset_set_create(void) { |
| 1168 | grpc_pollset_set* pss = (grpc_pollset_set*)gpr_zalloc(sizeof(*pss)); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1169 | gpr_mu_init(&pss->mu); |
| 1170 | gpr_ref_init(&pss->refs, 1); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1171 | return pss; |
| 1172 | } |
| 1173 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1174 | static void pollset_set_unref(grpc_exec_ctx* exec_ctx, grpc_pollset_set* pss) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1175 | if (pss == nullptr) return; |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1176 | if (!gpr_unref(&pss->refs)) return; |
| 1177 | pollset_set_unref(exec_ctx, pss->parent); |
| 1178 | gpr_mu_destroy(&pss->mu); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1179 | for (size_t i = 0; i < pss->pollset_count; i++) { |
Craig Tiller | 8232492 | 2017-10-16 21:37:28 +0000 | [diff] [blame] | 1180 | gpr_mu_lock(&pss->pollsets[i]->mu); |
Craig Tiller | b653dff | 2017-10-16 14:38:36 -0700 | [diff] [blame] | 1181 | if (0 == --pss->pollsets[i]->containing_pollset_set_count) { |
Craig Tiller | 8232492 | 2017-10-16 21:37:28 +0000 | [diff] [blame] | 1182 | pollset_maybe_finish_shutdown(exec_ctx, pss->pollsets[i]); |
| 1183 | } |
| 1184 | gpr_mu_unlock(&pss->pollsets[i]->mu); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1185 | } |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1186 | for (size_t i = 0; i < pss->fd_count; i++) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1187 | UNREF_BY(exec_ctx, pss->fds[i], 2, "pollset_set"); |
| 1188 | } |
| 1189 | gpr_free(pss->pollsets); |
| 1190 | gpr_free(pss->fds); |
Craig Tiller | 83d5fb6 | 2017-04-10 22:13:43 +0000 | [diff] [blame] | 1191 | gpr_free(pss); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1192 | } |
| 1193 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1194 | static void pollset_set_add_fd(grpc_exec_ctx* exec_ctx, grpc_pollset_set* pss, |
| 1195 | grpc_fd* fd) { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 1196 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1197 | gpr_log(GPR_DEBUG, "PSS:%p: add fd %p (%d)", pss, fd, fd->fd); |
| 1198 | } |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1199 | grpc_error* error = GRPC_ERROR_NONE; |
| 1200 | static const char* err_desc = "pollset_set_add_fd"; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1201 | pss = pss_lock_adam(pss); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1202 | for (size_t i = 0; i < pss->pollset_count; i++) { |
Craig Tiller | b653dff | 2017-10-16 14:38:36 -0700 | [diff] [blame] | 1203 | append_error(&error, pollable_add_fd(pss->pollsets[i]->active_pollable, fd), |
| 1204 | err_desc); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1205 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1206 | if (pss->fd_count == pss->fd_capacity) { |
| 1207 | pss->fd_capacity = GPR_MAX(pss->fd_capacity * 2, 8); |
Craig Tiller | 513daab | 2017-10-06 09:18:34 -0700 | [diff] [blame] | 1208 | pss->fds = |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1209 | (grpc_fd**)gpr_realloc(pss->fds, pss->fd_capacity * sizeof(*pss->fds)); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1210 | } |
| 1211 | REF_BY(fd, 2, "pollset_set"); |
| 1212 | pss->fds[pss->fd_count++] = fd; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1213 | gpr_mu_unlock(&pss->mu); |
| 1214 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1215 | GRPC_LOG_IF_ERROR(err_desc, error); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1216 | } |
| 1217 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1218 | static void pollset_set_del_fd(grpc_exec_ctx* exec_ctx, grpc_pollset_set* pss, |
| 1219 | grpc_fd* fd) { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 1220 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1221 | gpr_log(GPR_DEBUG, "PSS:%p: del fd %p", pss, fd); |
| 1222 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1223 | pss = pss_lock_adam(pss); |
| 1224 | size_t i; |
| 1225 | for (i = 0; i < pss->fd_count; i++) { |
| 1226 | if (pss->fds[i] == fd) { |
| 1227 | UNREF_BY(exec_ctx, fd, 2, "pollset_set"); |
| 1228 | break; |
| 1229 | } |
| 1230 | } |
| 1231 | GPR_ASSERT(i != pss->fd_count); |
| 1232 | for (; i < pss->fd_count - 1; i++) { |
| 1233 | pss->fds[i] = pss->fds[i + 1]; |
| 1234 | } |
| 1235 | pss->fd_count--; |
| 1236 | gpr_mu_unlock(&pss->mu); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1237 | } |
| 1238 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1239 | static void pollset_set_del_pollset(grpc_exec_ctx* exec_ctx, |
| 1240 | grpc_pollset_set* pss, grpc_pollset* ps) { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 1241 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1242 | gpr_log(GPR_DEBUG, "PSS:%p: del pollset %p", pss, ps); |
| 1243 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1244 | pss = pss_lock_adam(pss); |
| 1245 | size_t i; |
| 1246 | for (i = 0; i < pss->pollset_count; i++) { |
Craig Tiller | 8232492 | 2017-10-16 21:37:28 +0000 | [diff] [blame] | 1247 | if (pss->pollsets[i] == ps) { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1248 | break; |
| 1249 | } |
| 1250 | } |
| 1251 | GPR_ASSERT(i != pss->pollset_count); |
| 1252 | for (; i < pss->pollset_count - 1; i++) { |
| 1253 | pss->pollsets[i] = pss->pollsets[i + 1]; |
| 1254 | } |
| 1255 | pss->pollset_count--; |
| 1256 | gpr_mu_unlock(&pss->mu); |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 1257 | gpr_mu_lock(&ps->mu); |
| 1258 | if (0 == --ps->containing_pollset_set_count) { |
| 1259 | pollset_maybe_finish_shutdown(exec_ctx, ps); |
| 1260 | } |
| 1261 | gpr_mu_unlock(&ps->mu); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1262 | } |
| 1263 | |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1264 | // add all fds to pollables, and output a new array of unorphaned out_fds |
Craig Tiller | 8232492 | 2017-10-16 21:37:28 +0000 | [diff] [blame] | 1265 | // assumes pollsets are multipollable |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1266 | static grpc_error* add_fds_to_pollsets(grpc_exec_ctx* exec_ctx, grpc_fd** fds, |
| 1267 | size_t fd_count, grpc_pollset** pollsets, |
Craig Tiller | b653dff | 2017-10-16 14:38:36 -0700 | [diff] [blame] | 1268 | size_t pollset_count, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1269 | const char* err_desc, grpc_fd** out_fds, |
| 1270 | size_t* out_fd_count) { |
| 1271 | grpc_error* error = GRPC_ERROR_NONE; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1272 | for (size_t i = 0; i < fd_count; i++) { |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1273 | gpr_mu_lock(&fds[i]->orphan_mu); |
| 1274 | if ((gpr_atm_no_barrier_load(&fds[i]->refst) & 1) == 0) { |
| 1275 | gpr_mu_unlock(&fds[i]->orphan_mu); |
| 1276 | UNREF_BY(exec_ctx, fds[i], 2, "pollset_set"); |
| 1277 | } else { |
Craig Tiller | 8232492 | 2017-10-16 21:37:28 +0000 | [diff] [blame] | 1278 | for (size_t j = 0; j < pollset_count; j++) { |
Craig Tiller | b653dff | 2017-10-16 14:38:36 -0700 | [diff] [blame] | 1279 | append_error(&error, |
| 1280 | pollable_add_fd(pollsets[j]->active_pollable, fds[i]), |
| 1281 | err_desc); |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1282 | } |
| 1283 | gpr_mu_unlock(&fds[i]->orphan_mu); |
| 1284 | out_fds[(*out_fd_count)++] = fds[i]; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1285 | } |
| 1286 | } |
| 1287 | return error; |
| 1288 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1289 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1290 | static void pollset_set_add_pollset(grpc_exec_ctx* exec_ctx, |
| 1291 | grpc_pollset_set* pss, grpc_pollset* ps) { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 1292 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 79c4f1f | 2017-10-12 01:12:40 +0000 | [diff] [blame] | 1293 | gpr_log(GPR_DEBUG, "PSS:%p: add pollset %p", pss, ps); |
| 1294 | } |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1295 | grpc_error* error = GRPC_ERROR_NONE; |
| 1296 | static const char* err_desc = "pollset_set_add_pollset"; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1297 | pollable* pollable_obj = nullptr; |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame] | 1298 | gpr_mu_lock(&ps->mu); |
| 1299 | if (!GRPC_LOG_IF_ERROR(err_desc, pollset_as_multipollable_locked( |
| 1300 | exec_ctx, ps, &pollable_obj))) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1301 | GPR_ASSERT(pollable_obj == nullptr); |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame] | 1302 | gpr_mu_unlock(&ps->mu); |
Craig Tiller | 79c4f1f | 2017-10-12 01:12:40 +0000 | [diff] [blame] | 1303 | return; |
| 1304 | } |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame] | 1305 | ps->containing_pollset_set_count++; |
| 1306 | gpr_mu_unlock(&ps->mu); |
Craig Tiller | 79c4f1f | 2017-10-12 01:12:40 +0000 | [diff] [blame] | 1307 | pss = pss_lock_adam(pss); |
| 1308 | size_t initial_fd_count = pss->fd_count; |
| 1309 | pss->fd_count = 0; |
Craig Tiller | b653dff | 2017-10-16 14:38:36 -0700 | [diff] [blame] | 1310 | append_error(&error, |
| 1311 | add_fds_to_pollsets(exec_ctx, pss->fds, initial_fd_count, &ps, 1, |
| 1312 | err_desc, pss->fds, &pss->fd_count), |
Craig Tiller | 79c4f1f | 2017-10-12 01:12:40 +0000 | [diff] [blame] | 1313 | err_desc); |
| 1314 | if (pss->pollset_count == pss->pollset_capacity) { |
| 1315 | pss->pollset_capacity = GPR_MAX(pss->pollset_capacity * 2, 8); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1316 | pss->pollsets = (grpc_pollset**)gpr_realloc( |
Craig Tiller | 79c4f1f | 2017-10-12 01:12:40 +0000 | [diff] [blame] | 1317 | pss->pollsets, pss->pollset_capacity * sizeof(*pss->pollsets)); |
| 1318 | } |
Craig Tiller | 8232492 | 2017-10-16 21:37:28 +0000 | [diff] [blame] | 1319 | pss->pollsets[pss->pollset_count++] = ps; |
Craig Tiller | 79c4f1f | 2017-10-12 01:12:40 +0000 | [diff] [blame] | 1320 | gpr_mu_unlock(&pss->mu); |
Craig Tiller | b653dff | 2017-10-16 14:38:36 -0700 | [diff] [blame] | 1321 | POLLABLE_UNREF(pollable_obj, "pollset_set"); |
Craig Tiller | 79c4f1f | 2017-10-12 01:12:40 +0000 | [diff] [blame] | 1322 | |
| 1323 | GRPC_LOG_IF_ERROR(err_desc, error); |
| 1324 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1325 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1326 | static void pollset_set_add_pollset_set(grpc_exec_ctx* exec_ctx, |
| 1327 | grpc_pollset_set* a, |
| 1328 | grpc_pollset_set* b) { |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 1329 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1330 | gpr_log(GPR_DEBUG, "PSS: merge (%p, %p)", a, b); |
| 1331 | } |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1332 | grpc_error* error = GRPC_ERROR_NONE; |
| 1333 | static const char* err_desc = "pollset_set_add_fd"; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1334 | for (;;) { |
| 1335 | if (a == b) { |
| 1336 | // pollset ancestors are the same: nothing to do |
| 1337 | return; |
| 1338 | } |
| 1339 | if (a > b) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1340 | GPR_SWAP(grpc_pollset_set*, a, b); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1341 | } |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1342 | gpr_mu* a_mu = &a->mu; |
| 1343 | gpr_mu* b_mu = &b->mu; |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1344 | gpr_mu_lock(a_mu); |
| 1345 | gpr_mu_lock(b_mu); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1346 | if (a->parent != nullptr) { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1347 | a = a->parent; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1348 | } else if (b->parent != nullptr) { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1349 | b = b->parent; |
| 1350 | } else { |
| 1351 | break; // exit loop, both pollsets locked |
| 1352 | } |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1353 | gpr_mu_unlock(a_mu); |
| 1354 | gpr_mu_unlock(b_mu); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1355 | } |
| 1356 | // try to do the least copying possible |
| 1357 | // TODO(ctiller): there's probably a better heuristic here |
| 1358 | const size_t a_size = a->fd_count + a->pollset_count; |
| 1359 | const size_t b_size = b->fd_count + b->pollset_count; |
| 1360 | if (b_size > a_size) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1361 | GPR_SWAP(grpc_pollset_set*, a, b); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1362 | } |
ncteisen | 9ffb149 | 2017-11-10 14:00:49 -0800 | [diff] [blame] | 1363 | if (grpc_polling_trace.enabled()) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1364 | gpr_log(GPR_DEBUG, "PSS: parent %p to %p", b, a); |
| 1365 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1366 | gpr_ref(&a->refs); |
| 1367 | b->parent = a; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1368 | if (a->fd_capacity < a->fd_count + b->fd_count) { |
| 1369 | a->fd_capacity = GPR_MAX(2 * a->fd_capacity, a->fd_count + b->fd_count); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1370 | a->fds = (grpc_fd**)gpr_realloc(a->fds, a->fd_capacity * sizeof(*a->fds)); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1371 | } |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1372 | size_t initial_a_fd_count = a->fd_count; |
| 1373 | a->fd_count = 0; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1374 | append_error( |
| 1375 | &error, |
| 1376 | add_fds_to_pollsets(exec_ctx, a->fds, initial_a_fd_count, b->pollsets, |
| 1377 | b->pollset_count, "merge_a2b", a->fds, &a->fd_count), |
| 1378 | err_desc); |
| 1379 | append_error( |
| 1380 | &error, |
| 1381 | add_fds_to_pollsets(exec_ctx, b->fds, b->fd_count, a->pollsets, |
| 1382 | a->pollset_count, "merge_b2a", a->fds, &a->fd_count), |
| 1383 | err_desc); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1384 | if (a->pollset_capacity < a->pollset_count + b->pollset_count) { |
| 1385 | a->pollset_capacity = |
| 1386 | GPR_MAX(2 * a->pollset_capacity, a->pollset_count + b->pollset_count); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1387 | a->pollsets = (grpc_pollset**)gpr_realloc( |
Craig Tiller | 513daab | 2017-10-06 09:18:34 -0700 | [diff] [blame] | 1388 | a->pollsets, a->pollset_capacity * sizeof(*a->pollsets)); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1389 | } |
Craig Tiller | 658f5bd | 2017-10-17 09:12:34 -0700 | [diff] [blame] | 1390 | if (b->pollset_count > 0) { |
| 1391 | memcpy(a->pollsets + a->pollset_count, b->pollsets, |
| 1392 | b->pollset_count * sizeof(*b->pollsets)); |
| 1393 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1394 | a->pollset_count += b->pollset_count; |
| 1395 | gpr_free(b->fds); |
| 1396 | gpr_free(b->pollsets); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1397 | b->fds = nullptr; |
| 1398 | b->pollsets = nullptr; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1399 | b->fd_count = b->fd_capacity = b->pollset_count = b->pollset_capacity = 0; |
| 1400 | gpr_mu_unlock(&a->mu); |
| 1401 | gpr_mu_unlock(&b->mu); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1402 | } |
| 1403 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1404 | static void pollset_set_del_pollset_set(grpc_exec_ctx* exec_ctx, |
| 1405 | grpc_pollset_set* bag, |
| 1406 | grpc_pollset_set* item) {} |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1407 | |
| 1408 | /******************************************************************************* |
| 1409 | * Event engine binding |
| 1410 | */ |
| 1411 | |
| 1412 | static void shutdown_engine(void) { |
| 1413 | fd_global_shutdown(); |
| 1414 | pollset_global_shutdown(); |
| 1415 | } |
| 1416 | |
| 1417 | static const grpc_event_engine_vtable vtable = { |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1418 | sizeof(grpc_pollset), |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1419 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1420 | fd_create, |
| 1421 | fd_wrapped_fd, |
| 1422 | fd_orphan, |
| 1423 | fd_shutdown, |
| 1424 | fd_notify_on_read, |
| 1425 | fd_notify_on_write, |
| 1426 | fd_is_shutdown, |
| 1427 | fd_get_read_notifier_pollset, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1428 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1429 | pollset_init, |
| 1430 | pollset_shutdown, |
| 1431 | pollset_destroy, |
| 1432 | pollset_work, |
| 1433 | pollset_kick, |
| 1434 | pollset_add_fd, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1435 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1436 | pollset_set_create, |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1437 | pollset_set_unref, // destroy ==> unref 1 public ref |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1438 | pollset_set_add_pollset, |
| 1439 | pollset_set_del_pollset, |
| 1440 | pollset_set_add_pollset_set, |
| 1441 | pollset_set_del_pollset_set, |
| 1442 | pollset_set_add_fd, |
| 1443 | pollset_set_del_fd, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1444 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1445 | shutdown_engine, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1446 | }; |
| 1447 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1448 | const grpc_event_engine_vtable* grpc_init_epollex_linux( |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 1449 | bool explicitly_requested) { |
Craig Tiller | d4a0eb2 | 2017-10-18 09:27:15 -0700 | [diff] [blame] | 1450 | if (!explicitly_requested) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1451 | return nullptr; |
Craig Tiller | d4a0eb2 | 2017-10-18 09:27:15 -0700 | [diff] [blame] | 1452 | } |
| 1453 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1454 | if (!grpc_has_wakeup_fd()) { |
yang-g | 30101b0 | 2017-11-06 14:35:30 -0800 | [diff] [blame] | 1455 | gpr_log(GPR_ERROR, "Skipping epollex because of no wakeup fd."); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1456 | return nullptr; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1457 | } |
| 1458 | |
Craig Tiller | 819cd88 | 2017-04-25 13:18:22 -0700 | [diff] [blame] | 1459 | if (!grpc_is_epollexclusive_available()) { |
yang-g | 30101b0 | 2017-11-06 14:35:30 -0800 | [diff] [blame] | 1460 | gpr_log(GPR_INFO, "Skipping epollex because it is not supported."); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1461 | return nullptr; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1462 | } |
| 1463 | |
| 1464 | fd_global_init(); |
| 1465 | |
| 1466 | if (!GRPC_LOG_IF_ERROR("pollset_global_init", pollset_global_init())) { |
Craig Tiller | 54d388d | 2017-04-14 16:20:45 -0700 | [diff] [blame] | 1467 | pollset_global_shutdown(); |
| 1468 | fd_global_shutdown(); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1469 | return nullptr; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1470 | } |
| 1471 | |
| 1472 | return &vtable; |
| 1473 | } |
| 1474 | |
| 1475 | #else /* defined(GRPC_LINUX_EPOLL) */ |
| 1476 | #if defined(GRPC_POSIX_SOCKET) |
Yash Tibrewal | 1cac223 | 2017-09-26 11:31:11 -0700 | [diff] [blame] | 1477 | #include "src/core/lib/iomgr/ev_epollex_linux.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1478 | /* If GRPC_LINUX_EPOLL is not defined, it means epoll is not available. Return |
| 1479 | * NULL */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1480 | const grpc_event_engine_vtable* grpc_init_epollex_linux( |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 1481 | bool explicitly_requested) { |
| 1482 | return NULL; |
| 1483 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1484 | #endif /* defined(GRPC_POSIX_SOCKET) */ |
| 1485 | |
| 1486 | #endif /* !defined(GRPC_LINUX_EPOLL) */ |