Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 3 | * Copyright 2017 gRPC authors. |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 4 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 8 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 10 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 16 | * |
| 17 | */ |
| 18 | |
| 19 | #include "src/core/lib/iomgr/port.h" |
| 20 | |
| 21 | /* This polling engine is only relevant on linux kernels supporting epoll() */ |
| 22 | #ifdef GRPC_LINUX_EPOLL |
| 23 | |
Craig Tiller | c610985 | 2017-05-01 14:26:49 -0700 | [diff] [blame] | 24 | #include "src/core/lib/iomgr/ev_epollex_linux.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 25 | |
| 26 | #include <assert.h> |
| 27 | #include <errno.h> |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 28 | #include <limits.h> |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 29 | #include <poll.h> |
| 30 | #include <pthread.h> |
| 31 | #include <string.h> |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 32 | #include <sys/socket.h> |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame^] | 33 | #include <sys/syscall.h> |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 34 | #include <unistd.h> |
| 35 | |
| 36 | #include <grpc/support/alloc.h> |
| 37 | #include <grpc/support/log.h> |
| 38 | #include <grpc/support/string_util.h> |
| 39 | #include <grpc/support/tls.h> |
| 40 | #include <grpc/support/useful.h> |
| 41 | |
Craig Tiller | b4bb1cd | 2017-07-20 14:18:17 -0700 | [diff] [blame] | 42 | #include "src/core/lib/debug/stats.h" |
Craig Tiller | 6b7c1fb | 2017-07-19 15:45:03 -0700 | [diff] [blame] | 43 | #include "src/core/lib/iomgr/block_annotate.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 44 | #include "src/core/lib/iomgr/iomgr_internal.h" |
Craig Tiller | 819cd88 | 2017-04-25 13:18:22 -0700 | [diff] [blame] | 45 | #include "src/core/lib/iomgr/is_epollexclusive_available.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 46 | #include "src/core/lib/iomgr/lockfree_event.h" |
Craig Tiller | 819cd88 | 2017-04-25 13:18:22 -0700 | [diff] [blame] | 47 | #include "src/core/lib/iomgr/sys_epoll_wrapper.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 48 | #include "src/core/lib/iomgr/timer.h" |
| 49 | #include "src/core/lib/iomgr/wakeup_fd_posix.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 50 | #include "src/core/lib/profiling/timers.h" |
Craig Tiller | 0b4c901 | 2017-04-06 17:19:37 -0700 | [diff] [blame] | 51 | #include "src/core/lib/support/spinlock.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 52 | |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 53 | // debug aid: create workers on the heap (allows asan to spot |
| 54 | // use-after-destruction) |
Craig Tiller | 513daab | 2017-10-06 09:18:34 -0700 | [diff] [blame] | 55 | //#define GRPC_EPOLLEX_CREATE_WORKERS_ON_HEAP 1 |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 56 | |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 57 | #ifndef NDEBUG |
| 58 | grpc_tracer_flag grpc_trace_pollable_refcount = |
| 59 | GRPC_TRACER_INITIALIZER(false, "pollable_refcount"); |
| 60 | #endif |
| 61 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 62 | /******************************************************************************* |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 63 | * pollable Declarations |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 64 | */ |
| 65 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 66 | typedef enum { PO_MULTI, PO_FD, PO_EMPTY } pollable_type; |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 67 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 68 | typedef struct pollable pollable; |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 69 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 70 | struct pollable { |
| 71 | pollable_type type; // immutable |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 72 | gpr_refcount refs; |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 73 | |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 74 | int epfd; |
| 75 | grpc_wakeup_fd wakeup; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 76 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 77 | // only for type fd... one ref to the owner fd |
| 78 | grpc_fd *owner_fd; |
| 79 | |
| 80 | grpc_pollset_set *pollset_set; |
| 81 | pollable *next; |
| 82 | pollable *prev; |
| 83 | |
| 84 | gpr_mu mu; |
| 85 | grpc_pollset_worker *root_worker; |
| 86 | }; |
| 87 | |
| 88 | static const char *pollable_type_string(pollable_type t) { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 89 | switch (t) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 90 | case PO_MULTI: |
Craig Tiller | 7fd8f67 | 2017-07-05 15:10:12 -0700 | [diff] [blame] | 91 | return "pollset"; |
| 92 | case PO_FD: |
| 93 | return "fd"; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 94 | case PO_EMPTY: |
| 95 | return "empty"; |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 96 | } |
| 97 | return "<invalid>"; |
| 98 | } |
| 99 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 100 | static char *pollable_desc(pollable *p) { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 101 | char *out; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 102 | gpr_asprintf(&out, "type=%s epfd=%d wakeup=%d", pollable_type_string(p->type), |
| 103 | p->epfd, p->wakeup.read_fd); |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 104 | return out; |
| 105 | } |
| 106 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 107 | static pollable *g_empty_pollable; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 108 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 109 | static grpc_error *pollable_create(pollable_type type, pollable **p); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 110 | #ifdef NDEBUG |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 111 | static pollable *pollable_ref(pollable *p); |
| 112 | static void pollable_unref(pollable *p); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 113 | #define POLLABLE_REF(p, r) pollable_ref(p) |
| 114 | #define POLLABLE_UNREF(p, r) pollable_unref(p) |
| 115 | #else |
| 116 | static pollable *pollable_ref(pollable *p, int line, const char *reason); |
| 117 | static void pollable_unref(pollable *p, int line, const char *reason); |
| 118 | #define POLLABLE_REF(p, r) pollable_ref((p), __LINE__, (r)) |
| 119 | #define POLLABLE_UNREF(p, r) pollable_unref((p), __LINE__, (r)) |
| 120 | #endif |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 121 | |
| 122 | /******************************************************************************* |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 123 | * Fd Declarations |
| 124 | */ |
| 125 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 126 | struct grpc_fd { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 127 | int fd; |
| 128 | /* refst format: |
| 129 | bit 0 : 1=Active / 0=Orphaned |
| 130 | bits 1-n : refcount |
| 131 | Ref/Unref by two to avoid altering the orphaned bit */ |
| 132 | gpr_atm refst; |
| 133 | |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 134 | gpr_mu orphan_mu; |
| 135 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 136 | gpr_mu pollable_mu; |
| 137 | pollable *pollable_obj; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 138 | |
| 139 | gpr_atm read_closure; |
| 140 | gpr_atm write_closure; |
| 141 | |
| 142 | struct grpc_fd *freelist_next; |
| 143 | grpc_closure *on_done_closure; |
| 144 | |
| 145 | /* The pollset that last noticed that the fd is readable. The actual type |
| 146 | * stored in this is (grpc_pollset *) */ |
| 147 | gpr_atm read_notifier_pollset; |
| 148 | |
| 149 | grpc_iomgr_object iomgr_object; |
| 150 | }; |
| 151 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 152 | static void fd_global_init(void); |
| 153 | static void fd_global_shutdown(void); |
| 154 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 155 | /******************************************************************************* |
| 156 | * Pollset Declarations |
| 157 | */ |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 158 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 159 | typedef struct { |
| 160 | grpc_pollset_worker *next; |
| 161 | grpc_pollset_worker *prev; |
| 162 | } pwlink; |
| 163 | |
| 164 | typedef enum { PWLINK_POLLABLE = 0, PWLINK_POLLSET, PWLINK_COUNT } pwlinks; |
| 165 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 166 | struct grpc_pollset_worker { |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 167 | bool kicked; |
| 168 | bool initialized_cv; |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 169 | pid_t originator; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 170 | gpr_cv cv; |
Craig Tiller | 9f01251 | 2017-04-13 15:37:14 -0700 | [diff] [blame] | 171 | grpc_pollset *pollset; |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 172 | pollable *pollable_obj; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 173 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 174 | pwlink links[PWLINK_COUNT]; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 175 | }; |
| 176 | |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 177 | #define MAX_EPOLL_EVENTS 100 |
Craig Tiller | ca4fc66 | 2017-06-09 11:13:56 -0700 | [diff] [blame] | 178 | #define MAX_EPOLL_EVENTS_HANDLED_EACH_POLL_CALL 5 |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 179 | |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 180 | struct grpc_pollset { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 181 | gpr_mu mu; |
| 182 | pollable *active_pollable; |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 183 | bool kicked_without_poller; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 184 | grpc_closure *shutdown_closure; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 185 | grpc_pollset_worker *root_worker; |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 186 | int containing_pollset_set_count; |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 187 | |
| 188 | int event_cursor; |
| 189 | int event_count; |
| 190 | struct epoll_event events[MAX_EPOLL_EVENTS]; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 191 | }; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 192 | |
| 193 | /******************************************************************************* |
| 194 | * Pollset-set Declarations |
| 195 | */ |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 196 | |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 197 | struct grpc_pollset_set { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 198 | gpr_refcount refs; |
| 199 | gpr_mu mu; |
| 200 | grpc_pollset_set *parent; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 201 | |
| 202 | size_t pollset_count; |
| 203 | size_t pollset_capacity; |
| 204 | pollable **pollsets; |
| 205 | |
| 206 | size_t fd_count; |
| 207 | size_t fd_capacity; |
| 208 | grpc_fd **fds; |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 209 | }; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 210 | |
| 211 | /******************************************************************************* |
| 212 | * Common helpers |
| 213 | */ |
| 214 | |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 215 | static bool append_error(grpc_error **composite, grpc_error *error, |
| 216 | const char *desc) { |
| 217 | if (error == GRPC_ERROR_NONE) return true; |
| 218 | if (*composite == GRPC_ERROR_NONE) { |
| 219 | *composite = GRPC_ERROR_CREATE_FROM_COPIED_STRING(desc); |
| 220 | } |
| 221 | *composite = grpc_error_add_child(*composite, error); |
| 222 | return false; |
| 223 | } |
| 224 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 225 | /******************************************************************************* |
| 226 | * Fd Definitions |
| 227 | */ |
| 228 | |
| 229 | /* We need to keep a freelist not because of any concerns of malloc performance |
| 230 | * but instead so that implementations with multiple threads in (for example) |
| 231 | * epoll_wait deal with the race between pollset removal and incoming poll |
| 232 | * notifications. |
| 233 | * |
| 234 | * The problem is that the poller ultimately holds a reference to this |
| 235 | * object, so it is very difficult to know when is safe to free it, at least |
| 236 | * without some expensive synchronization. |
| 237 | * |
| 238 | * If we keep the object freelisted, in the worst case losing this race just |
| 239 | * becomes a spurious read notification on a reused fd. |
| 240 | */ |
| 241 | |
| 242 | /* The alarm system needs to be able to wakeup 'some poller' sometimes |
| 243 | * (specifically when a new alarm needs to be triggered earlier than the next |
| 244 | * alarm 'epoch'). This wakeup_fd gives us something to alert on when such a |
| 245 | * case occurs. */ |
| 246 | |
| 247 | static grpc_fd *fd_freelist = NULL; |
| 248 | static gpr_mu fd_freelist_mu; |
| 249 | |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 250 | #ifndef NDEBUG |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 251 | #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] | 252 | #define UNREF_BY(ec, fd, n, reason) \ |
| 253 | unref_by(ec, fd, n, reason, __FILE__, __LINE__) |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 254 | static void ref_by(grpc_fd *fd, int n, const char *reason, const char *file, |
| 255 | int line) { |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 256 | if (GRPC_TRACER_ON(grpc_trace_fd_refcount)) { |
| 257 | gpr_log(GPR_DEBUG, |
| 258 | "FD %d %p ref %d %" PRIdPTR " -> %" PRIdPTR " [%s; %s:%d]", |
| 259 | fd->fd, fd, n, gpr_atm_no_barrier_load(&fd->refst), |
| 260 | gpr_atm_no_barrier_load(&fd->refst) + n, reason, file, line); |
| 261 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 262 | #else |
| 263 | #define REF_BY(fd, n, reason) ref_by(fd, n) |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 264 | #define UNREF_BY(ec, fd, n, reason) unref_by(ec, fd, n) |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 265 | static void ref_by(grpc_fd *fd, int n) { |
| 266 | #endif |
| 267 | GPR_ASSERT(gpr_atm_no_barrier_fetch_add(&fd->refst, n) > 0); |
| 268 | } |
| 269 | |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 270 | static void fd_destroy(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) { |
Yash Tibrewal | ca3c1c0 | 2017-09-07 22:47:16 -0700 | [diff] [blame] | 271 | grpc_fd *fd = (grpc_fd *)arg; |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 272 | /* Add the fd to the freelist */ |
| 273 | grpc_iomgr_unregister_object(&fd->iomgr_object); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 274 | POLLABLE_UNREF(fd->pollable_obj, "fd_pollable"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 275 | gpr_mu_destroy(&fd->pollable_mu); |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 276 | gpr_mu_destroy(&fd->orphan_mu); |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 277 | gpr_mu_lock(&fd_freelist_mu); |
| 278 | fd->freelist_next = fd_freelist; |
| 279 | fd_freelist = fd; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 280 | |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 281 | grpc_lfev_destroy(&fd->read_closure); |
| 282 | grpc_lfev_destroy(&fd->write_closure); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 283 | |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 284 | gpr_mu_unlock(&fd_freelist_mu); |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 285 | } |
| 286 | |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 287 | #ifndef NDEBUG |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 288 | static void unref_by(grpc_exec_ctx *exec_ctx, grpc_fd *fd, int n, |
| 289 | const char *reason, const char *file, int line) { |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 290 | if (GRPC_TRACER_ON(grpc_trace_fd_refcount)) { |
| 291 | gpr_log(GPR_DEBUG, |
| 292 | "FD %d %p unref %d %" PRIdPTR " -> %" PRIdPTR " [%s; %s:%d]", |
| 293 | fd->fd, fd, n, gpr_atm_no_barrier_load(&fd->refst), |
| 294 | gpr_atm_no_barrier_load(&fd->refst) - n, reason, file, line); |
| 295 | } |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 296 | #else |
| 297 | 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] | 298 | #endif |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 299 | gpr_atm old = gpr_atm_full_fetch_add(&fd->refst, -n); |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 300 | if (old == n) { |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 301 | GRPC_CLOSURE_SCHED(exec_ctx, GRPC_CLOSURE_CREATE(fd_destroy, fd, |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 302 | grpc_schedule_on_exec_ctx), |
| 303 | GRPC_ERROR_NONE); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 304 | } else { |
| 305 | GPR_ASSERT(old > n); |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | static void fd_global_init(void) { gpr_mu_init(&fd_freelist_mu); } |
| 310 | |
| 311 | static void fd_global_shutdown(void) { |
| 312 | gpr_mu_lock(&fd_freelist_mu); |
| 313 | gpr_mu_unlock(&fd_freelist_mu); |
| 314 | while (fd_freelist != NULL) { |
| 315 | grpc_fd *fd = fd_freelist; |
| 316 | fd_freelist = fd_freelist->freelist_next; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 317 | gpr_free(fd); |
| 318 | } |
| 319 | gpr_mu_destroy(&fd_freelist_mu); |
| 320 | } |
| 321 | |
| 322 | static grpc_fd *fd_create(int fd, const char *name) { |
| 323 | grpc_fd *new_fd = NULL; |
| 324 | |
| 325 | gpr_mu_lock(&fd_freelist_mu); |
| 326 | if (fd_freelist != NULL) { |
| 327 | new_fd = fd_freelist; |
| 328 | fd_freelist = fd_freelist->freelist_next; |
| 329 | } |
| 330 | gpr_mu_unlock(&fd_freelist_mu); |
| 331 | |
| 332 | if (new_fd == NULL) { |
Yash Tibrewal | ca3c1c0 | 2017-09-07 22:47:16 -0700 | [diff] [blame] | 333 | new_fd = (grpc_fd *)gpr_malloc(sizeof(grpc_fd)); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 334 | } |
| 335 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 336 | gpr_mu_init(&new_fd->pollable_mu); |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 337 | gpr_mu_init(&new_fd->orphan_mu); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 338 | new_fd->pollable_obj = NULL; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 339 | gpr_atm_rel_store(&new_fd->refst, (gpr_atm)1); |
| 340 | new_fd->fd = fd; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 341 | grpc_lfev_init(&new_fd->read_closure); |
| 342 | grpc_lfev_init(&new_fd->write_closure); |
| 343 | gpr_atm_no_barrier_store(&new_fd->read_notifier_pollset, (gpr_atm)NULL); |
| 344 | |
| 345 | new_fd->freelist_next = NULL; |
| 346 | new_fd->on_done_closure = NULL; |
| 347 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 348 | char *fd_name; |
| 349 | gpr_asprintf(&fd_name, "%s fd=%d", name, fd); |
| 350 | grpc_iomgr_register_object(&new_fd->iomgr_object, fd_name); |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 351 | #ifndef NDEBUG |
| 352 | if (GRPC_TRACER_ON(grpc_trace_fd_refcount)) { |
| 353 | gpr_log(GPR_DEBUG, "FD %d %p create %s", fd, new_fd, fd_name); |
| 354 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 355 | #endif |
| 356 | gpr_free(fd_name); |
| 357 | return new_fd; |
| 358 | } |
| 359 | |
| 360 | static int fd_wrapped_fd(grpc_fd *fd) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 361 | int ret_fd = fd->fd; |
| 362 | return (gpr_atm_acq_load(&fd->refst) & 1) ? ret_fd : -1; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 363 | } |
| 364 | |
| 365 | static void fd_orphan(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 366 | grpc_closure *on_done, int *release_fd, |
Yuchen Zeng | d40a7ae | 2017-07-12 15:59:56 -0700 | [diff] [blame] | 367 | bool already_closed, const char *reason) { |
| 368 | bool is_fd_closed = already_closed; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 369 | |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 370 | gpr_mu_lock(&fd->orphan_mu); |
| 371 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 372 | fd->on_done_closure = on_done; |
| 373 | |
| 374 | /* If release_fd is not NULL, we should be relinquishing control of the file |
| 375 | descriptor fd->fd (but we still own the grpc_fd structure). */ |
| 376 | if (release_fd != NULL) { |
| 377 | *release_fd = fd->fd; |
Yuchen Zeng | d40a7ae | 2017-07-12 15:59:56 -0700 | [diff] [blame] | 378 | } else if (!is_fd_closed) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 379 | close(fd->fd); |
| 380 | is_fd_closed = true; |
| 381 | } |
| 382 | |
Craig Tiller | f4360d7 | 2017-04-07 08:51:00 -0700 | [diff] [blame] | 383 | if (!is_fd_closed) { |
| 384 | gpr_log(GPR_DEBUG, "TODO: handle fd removal?"); |
| 385 | } |
| 386 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 387 | /* Remove the active status but keep referenced. We want this grpc_fd struct |
| 388 | to be alive (and not added to freelist) until the end of this function */ |
| 389 | REF_BY(fd, 1, reason); |
| 390 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 391 | GRPC_CLOSURE_SCHED(exec_ctx, fd->on_done_closure, GRPC_ERROR_NONE); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 392 | |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 393 | gpr_mu_unlock(&fd->orphan_mu); |
| 394 | |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 395 | UNREF_BY(exec_ctx, fd, 2, reason); /* Drop the reference */ |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 396 | } |
| 397 | |
| 398 | static grpc_pollset *fd_get_read_notifier_pollset(grpc_exec_ctx *exec_ctx, |
| 399 | grpc_fd *fd) { |
| 400 | gpr_atm notifier = gpr_atm_acq_load(&fd->read_notifier_pollset); |
| 401 | return (grpc_pollset *)notifier; |
| 402 | } |
| 403 | |
| 404 | static bool fd_is_shutdown(grpc_fd *fd) { |
| 405 | return grpc_lfev_is_shutdown(&fd->read_closure); |
| 406 | } |
| 407 | |
| 408 | /* Might be called multiple times */ |
| 409 | static void fd_shutdown(grpc_exec_ctx *exec_ctx, grpc_fd *fd, grpc_error *why) { |
| 410 | if (grpc_lfev_set_shutdown(exec_ctx, &fd->read_closure, |
| 411 | GRPC_ERROR_REF(why))) { |
| 412 | shutdown(fd->fd, SHUT_RDWR); |
| 413 | grpc_lfev_set_shutdown(exec_ctx, &fd->write_closure, GRPC_ERROR_REF(why)); |
| 414 | } |
| 415 | GRPC_ERROR_UNREF(why); |
| 416 | } |
| 417 | |
| 418 | static void fd_notify_on_read(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 419 | grpc_closure *closure) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 420 | grpc_lfev_notify_on(exec_ctx, &fd->read_closure, closure, "read"); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 421 | } |
| 422 | |
| 423 | static void fd_notify_on_write(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 424 | grpc_closure *closure) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 425 | grpc_lfev_notify_on(exec_ctx, &fd->write_closure, closure, "write"); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 426 | } |
| 427 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 428 | /******************************************************************************* |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 429 | * Pollable Definitions |
| 430 | */ |
| 431 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 432 | static grpc_error *pollable_create(pollable_type type, pollable **p) { |
| 433 | *p = NULL; |
| 434 | |
| 435 | int epfd = epoll_create1(EPOLL_CLOEXEC); |
| 436 | if (epfd == -1) { |
| 437 | return GRPC_OS_ERROR(errno, "epoll_create1"); |
| 438 | } |
Craig Tiller | 513daab | 2017-10-06 09:18:34 -0700 | [diff] [blame] | 439 | *p = (pollable *)gpr_malloc(sizeof(**p)); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 440 | grpc_error *err = grpc_wakeup_fd_init(&(*p)->wakeup); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 441 | if (err != GRPC_ERROR_NONE) { |
| 442 | close(epfd); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 443 | gpr_free(*p); |
| 444 | *p = NULL; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 445 | return err; |
| 446 | } |
| 447 | struct epoll_event ev; |
| 448 | ev.events = (uint32_t)(EPOLLIN | EPOLLET); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 449 | ev.data.ptr = (void *)(1 | (intptr_t) & (*p)->wakeup); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 450 | 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] | 451 | err = GRPC_OS_ERROR(errno, "epoll_ctl"); |
| 452 | close(epfd); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 453 | grpc_wakeup_fd_destroy(&(*p)->wakeup); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 454 | gpr_free(*p); |
| 455 | *p = NULL; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 456 | return err; |
| 457 | } |
| 458 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 459 | (*p)->type = type; |
| 460 | gpr_ref_init(&(*p)->refs, 1); |
Craig Tiller | 65da0ef | 2017-10-02 15:35:59 -0700 | [diff] [blame] | 461 | gpr_mu_init(&(*p)->mu); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 462 | (*p)->epfd = epfd; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 463 | (*p)->owner_fd = NULL; |
| 464 | (*p)->pollset_set = NULL; |
| 465 | (*p)->next = (*p)->prev = *p; |
| 466 | (*p)->root_worker = NULL; |
| 467 | return GRPC_ERROR_NONE; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 468 | } |
| 469 | |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 470 | #ifdef NDEBUG |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 471 | static pollable *pollable_ref(pollable *p) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 472 | #else |
| 473 | static pollable *pollable_ref(pollable *p, int line, const char *reason) { |
| 474 | if (GRPC_TRACER_ON(grpc_trace_pollable_refcount)) { |
| 475 | int r = (int)gpr_atm_no_barrier_load(&p->refs.count); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 476 | gpr_log(__FILE__, line, GPR_LOG_SEVERITY_DEBUG, |
| 477 | "POLLABLE:%p ref %d->%d %s", p, r, r + 1, reason); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 478 | } |
| 479 | #endif |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 480 | gpr_ref(&p->refs); |
| 481 | return p; |
| 482 | } |
| 483 | |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 484 | #ifdef NDEBUG |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 485 | static void pollable_unref(pollable *p) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 486 | #else |
| 487 | static void pollable_unref(pollable *p, int line, const char *reason) { |
| 488 | if (p == NULL) return; |
| 489 | if (GRPC_TRACER_ON(grpc_trace_pollable_refcount)) { |
| 490 | int r = (int)gpr_atm_no_barrier_load(&p->refs.count); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 491 | gpr_log(__FILE__, line, GPR_LOG_SEVERITY_DEBUG, |
| 492 | "POLLABLE:%p unref %d->%d %s", p, r, r - 1, reason); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 493 | } |
| 494 | #endif |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 495 | if (p != NULL && gpr_unref(&p->refs)) { |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 496 | close(p->epfd); |
| 497 | grpc_wakeup_fd_destroy(&p->wakeup); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 498 | gpr_free(p); |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 499 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 500 | } |
| 501 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 502 | static grpc_error *pollable_add_fd(pollable *p, grpc_fd *fd) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 503 | grpc_error *error = GRPC_ERROR_NONE; |
| 504 | static const char *err_desc = "pollable_add_fd"; |
| 505 | const int epfd = p->epfd; |
| 506 | |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 507 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 508 | 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] | 509 | } |
| 510 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 511 | struct epoll_event ev_fd; |
| 512 | ev_fd.events = (uint32_t)(EPOLLET | EPOLLIN | EPOLLOUT | EPOLLEXCLUSIVE); |
| 513 | ev_fd.data.ptr = fd; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 514 | if (epoll_ctl(epfd, EPOLL_CTL_ADD, fd->fd, &ev_fd) != 0) { |
| 515 | switch (errno) { |
Craig Tiller | 61f96c1 | 2017-05-12 13:36:39 -0700 | [diff] [blame] | 516 | case EEXIST: |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 517 | break; |
| 518 | default: |
| 519 | append_error(&error, GRPC_OS_ERROR(errno, "epoll_ctl"), err_desc); |
| 520 | } |
| 521 | } |
| 522 | |
| 523 | return error; |
| 524 | } |
| 525 | |
| 526 | /******************************************************************************* |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 527 | * Pollset Definitions |
| 528 | */ |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 529 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 530 | GPR_TLS_DECL(g_current_thread_pollset); |
| 531 | GPR_TLS_DECL(g_current_thread_worker); |
| 532 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 533 | /* Global state management */ |
| 534 | static grpc_error *pollset_global_init(void) { |
| 535 | gpr_tls_init(&g_current_thread_pollset); |
| 536 | gpr_tls_init(&g_current_thread_worker); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 537 | return pollable_create(PO_EMPTY, &g_empty_pollable); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 538 | } |
| 539 | |
| 540 | static void pollset_global_shutdown(void) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 541 | POLLABLE_UNREF(g_empty_pollable, "g_empty_pollable"); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 542 | gpr_tls_destroy(&g_current_thread_pollset); |
| 543 | gpr_tls_destroy(&g_current_thread_worker); |
| 544 | } |
| 545 | |
Craig Tiller | e16722c | 2017-05-17 21:50:37 +0000 | [diff] [blame] | 546 | static void pollset_maybe_finish_shutdown(grpc_exec_ctx *exec_ctx, |
| 547 | grpc_pollset *pollset) { |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame^] | 548 | if (pollset->shutdown_closure != NULL && pollset->root_worker == NULL && |
| 549 | pollset->containing_pollset_set_count == 0) { |
Craig Tiller | ca669b0 | 2017-06-09 12:41:51 -0700 | [diff] [blame] | 550 | GRPC_CLOSURE_SCHED(exec_ctx, pollset->shutdown_closure, GRPC_ERROR_NONE); |
Craig Tiller | e16722c | 2017-05-17 21:50:37 +0000 | [diff] [blame] | 551 | pollset->shutdown_closure = NULL; |
| 552 | } |
| 553 | } |
| 554 | |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame^] | 555 | /* pollset->mu must be held before calling this function, |
| 556 | * pollset->active_pollable->mu & specific_worker->pollable_obj->mu must not be |
| 557 | * held */ |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 558 | static grpc_error *pollset_kick_one(grpc_exec_ctx *exec_ctx, |
| 559 | grpc_pollset *pollset, |
| 560 | grpc_pollset_worker *specific_worker) { |
Craig Tiller | 3d073c2 | 2017-10-04 22:10:58 +0000 | [diff] [blame] | 561 | pollable *p = specific_worker->pollable_obj; |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 562 | grpc_core::mu_guard lock(&p->mu); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 563 | GPR_ASSERT(specific_worker != NULL); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 564 | if (specific_worker->kicked) { |
| 565 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 566 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_but_already_kicked", p); |
| 567 | } |
| 568 | return GRPC_ERROR_NONE; |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 569 | } |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame^] | 570 | if (gpr_tls_get(&g_current_thread_worker) == (intptr_t)specific_worker) { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 571 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 572 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_but_awake", p); |
| 573 | } |
| 574 | specific_worker->kicked = true; |
| 575 | return GRPC_ERROR_NONE; |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame^] | 576 | } |
| 577 | if (specific_worker == p->root_worker) { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 578 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 579 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_via_wakeup_fd", p); |
| 580 | } |
| 581 | specific_worker->kicked = true; |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 582 | grpc_error *error = grpc_wakeup_fd_wakeup(&p->wakeup); |
| 583 | return error; |
| 584 | } |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame^] | 585 | if (specific_worker->initialized_cv) { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 586 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 587 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_via_cv", p); |
| 588 | } |
| 589 | specific_worker->kicked = true; |
| 590 | gpr_cv_signal(&specific_worker->cv); |
| 591 | return GRPC_ERROR_NONE; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 592 | } |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame^] | 593 | // we can get here during end_worker after removing specific_worker from the |
| 594 | // pollable list but before removing it from the pollset list |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 595 | return GRPC_ERROR_NONE; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 596 | } |
| 597 | |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 598 | static grpc_error *pollset_kick(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 599 | grpc_pollset_worker *specific_worker) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 600 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 601 | gpr_log(GPR_DEBUG, |
Craig Tiller | 3d073c2 | 2017-10-04 22:10:58 +0000 | [diff] [blame] | 602 | "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] | 603 | pollset, specific_worker, |
| 604 | (void *)gpr_tls_get(&g_current_thread_pollset), |
| 605 | (void *)gpr_tls_get(&g_current_thread_worker), |
| 606 | pollset->root_worker); |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 607 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 608 | if (specific_worker == NULL) { |
Craig Tiller | b72a74a | 2017-04-27 12:07:05 -0700 | [diff] [blame] | 609 | if (gpr_tls_get(&g_current_thread_pollset) != (intptr_t)pollset) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 610 | if (pollset->root_worker == NULL) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 611 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 3d073c2 | 2017-10-04 22:10:58 +0000 | [diff] [blame] | 612 | gpr_log(GPR_DEBUG, "PS:%p kicked_any_without_poller", pollset); |
Craig Tiller | 1ad9477 | 2017-04-11 16:15:19 +0000 | [diff] [blame] | 613 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 614 | pollset->kicked_without_poller = true; |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 615 | return GRPC_ERROR_NONE; |
| 616 | } else { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 617 | return pollset_kick_one(exec_ctx, pollset, pollset->root_worker); |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 618 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 619 | } else { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 620 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 3d073c2 | 2017-10-04 22:10:58 +0000 | [diff] [blame] | 621 | gpr_log(GPR_DEBUG, "PS:%p kicked_any_but_awake", pollset); |
Craig Tiller | 1ad9477 | 2017-04-11 16:15:19 +0000 | [diff] [blame] | 622 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 623 | return GRPC_ERROR_NONE; |
| 624 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 625 | } else { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 626 | return pollset_kick_one(exec_ctx, pollset, specific_worker); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 627 | } |
Craig Tiller | 26017de | 2017-04-15 00:07:25 +0000 | [diff] [blame] | 628 | } |
| 629 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 630 | static grpc_error *pollset_kick_all(grpc_exec_ctx *exec_ctx, |
| 631 | grpc_pollset *pollset) { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 632 | grpc_error *error = GRPC_ERROR_NONE; |
| 633 | const char *err_desc = "pollset_kick_all"; |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 634 | grpc_pollset_worker *w = pollset->root_worker; |
| 635 | if (w != NULL) { |
| 636 | do { |
| 637 | append_error(&error, pollset_kick_one(exec_ctx, pollset, w), err_desc); |
| 638 | w = w->links[PWLINK_POLLSET].next; |
| 639 | } while (w != pollset->root_worker); |
| 640 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 641 | return error; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 642 | } |
| 643 | |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 644 | static void pollset_init(grpc_pollset *pollset, gpr_mu **mu) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 645 | gpr_mu_init(&pollset->mu); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 646 | pollset->active_pollable = POLLABLE_REF(g_empty_pollable, "pollset"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 647 | *mu = &pollset->mu; |
Craig Tiller | 9f01251 | 2017-04-13 15:37:14 -0700 | [diff] [blame] | 648 | } |
| 649 | |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 650 | static int poll_deadline_to_millis_timeout(grpc_exec_ctx *exec_ctx, |
| 651 | grpc_millis millis) { |
| 652 | if (millis == GRPC_MILLIS_INF_FUTURE) return -1; |
| 653 | grpc_millis delta = millis - grpc_exec_ctx_now(exec_ctx); |
| 654 | if (delta > INT_MAX) |
| 655 | return INT_MAX; |
| 656 | else if (delta < 0) |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 657 | return 0; |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 658 | else |
| 659 | return (int)delta; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 660 | } |
| 661 | |
| 662 | static void fd_become_readable(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 663 | grpc_pollset *notifier) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 664 | grpc_lfev_set_ready(exec_ctx, &fd->read_closure, "read"); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 665 | |
| 666 | /* Note, it is possible that fd_become_readable might be called twice with |
| 667 | different 'notifier's when an fd becomes readable and it is in two epoll |
| 668 | sets (This can happen briefly during polling island merges). In such cases |
| 669 | it does not really matter which notifer is set as the read_notifier_pollset |
| 670 | (They would both point to the same polling island anyway) */ |
| 671 | /* Use release store to match with acquire load in fd_get_read_notifier */ |
| 672 | gpr_atm_rel_store(&fd->read_notifier_pollset, (gpr_atm)notifier); |
| 673 | } |
| 674 | |
| 675 | static void fd_become_writable(grpc_exec_ctx *exec_ctx, grpc_fd *fd) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 676 | grpc_lfev_set_ready(exec_ctx, &fd->write_closure, "write"); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 677 | } |
| 678 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 679 | static grpc_error *fd_become_pollable(grpc_fd *fd, pollable **p) { |
| 680 | gpr_mu_lock(&fd->pollable_mu); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 681 | grpc_error *error = GRPC_ERROR_NONE; |
| 682 | static const char *err_desc = "fd_become_pollable"; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 683 | if (fd->pollable_obj == NULL) { |
| 684 | if (append_error(&error, pollable_create(PO_FD, &fd->pollable_obj), |
| 685 | err_desc)) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 686 | fd->pollable_obj->owner_fd = fd; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 687 | if (!append_error(&error, pollable_add_fd(fd->pollable_obj, fd), |
| 688 | err_desc)) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 689 | POLLABLE_UNREF(fd->pollable_obj, "fd_pollable"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 690 | fd->pollable_obj = NULL; |
| 691 | } |
| 692 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 693 | } |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 694 | if (error == GRPC_ERROR_NONE) { |
| 695 | GPR_ASSERT(fd->pollable_obj != NULL); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 696 | *p = POLLABLE_REF(fd->pollable_obj, "pollset"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 697 | } else { |
| 698 | GPR_ASSERT(fd->pollable_obj == NULL); |
| 699 | *p = NULL; |
| 700 | } |
| 701 | gpr_mu_unlock(&fd->pollable_mu); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 702 | return error; |
| 703 | } |
| 704 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 705 | /* pollset->po.mu lock must be held by the caller before calling this */ |
| 706 | static void pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 707 | grpc_closure *closure) { |
| 708 | GPR_ASSERT(pollset->shutdown_closure == NULL); |
| 709 | pollset->shutdown_closure = closure; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 710 | GRPC_LOG_IF_ERROR("pollset_shutdown", pollset_kick_all(exec_ctx, pollset)); |
Craig Tiller | d9cd8f0 | 2017-04-07 16:26:02 -0700 | [diff] [blame] | 711 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 712 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 713 | |
Craig Tiller | 9bedddd | 2017-06-08 17:05:00 -0700 | [diff] [blame] | 714 | static grpc_error *pollset_process_events(grpc_exec_ctx *exec_ctx, |
| 715 | grpc_pollset *pollset, bool drain) { |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 716 | static const char *err_desc = "pollset_process_events"; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 717 | grpc_error *error = GRPC_ERROR_NONE; |
Craig Tiller | ca4fc66 | 2017-06-09 11:13:56 -0700 | [diff] [blame] | 718 | for (int i = 0; (drain || i < MAX_EPOLL_EVENTS_HANDLED_EACH_POLL_CALL) && |
| 719 | pollset->event_cursor != pollset->event_count; |
| 720 | i++) { |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 721 | int n = pollset->event_cursor++; |
| 722 | struct epoll_event *ev = &pollset->events[n]; |
| 723 | void *data_ptr = ev->data.ptr; |
| 724 | if (1 & (intptr_t)data_ptr) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 725 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 726 | 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] | 727 | } |
Yash Tibrewal | 52778c4 | 2017-09-11 15:00:11 -0700 | [diff] [blame] | 728 | append_error(&error, |
| 729 | grpc_wakeup_fd_consume_wakeup( |
| 730 | (grpc_wakeup_fd *)((~(intptr_t)1) & (intptr_t)data_ptr)), |
Craig Tiller | 9bedddd | 2017-06-08 17:05:00 -0700 | [diff] [blame] | 731 | err_desc); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 732 | } else { |
Craig Tiller | 61f96c1 | 2017-05-12 13:36:39 -0700 | [diff] [blame] | 733 | grpc_fd *fd = (grpc_fd *)data_ptr; |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 734 | bool cancel = (ev->events & (EPOLLERR | EPOLLHUP)) != 0; |
| 735 | bool read_ev = (ev->events & (EPOLLIN | EPOLLPRI)) != 0; |
| 736 | bool write_ev = (ev->events & EPOLLOUT) != 0; |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 737 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 738 | gpr_log(GPR_DEBUG, |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 739 | "PS:%p got fd %p: cancel=%d read=%d " |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 740 | "write=%d", |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 741 | pollset, fd, cancel, read_ev, write_ev); |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 742 | } |
Craig Tiller | 61f96c1 | 2017-05-12 13:36:39 -0700 | [diff] [blame] | 743 | if (read_ev || cancel) { |
| 744 | fd_become_readable(exec_ctx, fd, pollset); |
| 745 | } |
| 746 | if (write_ev || cancel) { |
| 747 | fd_become_writable(exec_ctx, fd); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 748 | } |
| 749 | } |
| 750 | } |
| 751 | |
| 752 | return error; |
| 753 | } |
| 754 | |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 755 | /* pollset_shutdown is guaranteed to be called before pollset_destroy. */ |
| 756 | static void pollset_destroy(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 757 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 758 | pollset->active_pollable = NULL; |
Craig Tiller | 9bedddd | 2017-06-08 17:05:00 -0700 | [diff] [blame] | 759 | GRPC_LOG_IF_ERROR("pollset_process_events", |
| 760 | pollset_process_events(exec_ctx, pollset, true)); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 761 | } |
| 762 | |
| 763 | static grpc_error *pollset_epoll(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
Craig Tiller | 50448be | 2017-09-18 13:56:51 -0700 | [diff] [blame] | 764 | pollable *p, grpc_millis deadline) { |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 765 | int timeout = poll_deadline_to_millis_timeout(exec_ctx, deadline); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 766 | |
| 767 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 768 | char *desc = pollable_desc(p); |
| 769 | gpr_log(GPR_DEBUG, "PS:%p poll %p[%s] for %dms", pollset, p, desc, timeout); |
| 770 | gpr_free(desc); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 771 | } |
| 772 | |
| 773 | if (timeout != 0) { |
| 774 | GRPC_SCHEDULING_START_BLOCKING_REGION; |
| 775 | } |
| 776 | int r; |
| 777 | do { |
Craig Tiller | b4bb1cd | 2017-07-20 14:18:17 -0700 | [diff] [blame] | 778 | GRPC_STATS_INC_SYSCALL_POLL(exec_ctx); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 779 | r = epoll_wait(p->epfd, pollset->events, MAX_EPOLL_EVENTS, timeout); |
| 780 | } while (r < 0 && errno == EINTR); |
| 781 | if (timeout != 0) { |
Craig Tiller | 781e91a | 2017-07-17 16:21:00 -0700 | [diff] [blame] | 782 | GRPC_SCHEDULING_END_BLOCKING_REGION_WITH_EXEC_CTX(exec_ctx); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 783 | } |
| 784 | |
| 785 | if (r < 0) return GRPC_OS_ERROR(errno, "epoll_wait"); |
| 786 | |
| 787 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 788 | gpr_log(GPR_DEBUG, "PS:%p poll %p got %d events", pollset, p, r); |
| 789 | } |
| 790 | |
| 791 | pollset->event_cursor = 0; |
| 792 | pollset->event_count = r; |
| 793 | |
| 794 | return GRPC_ERROR_NONE; |
| 795 | } |
| 796 | |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 797 | /* Return true if first in list */ |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 798 | static bool worker_insert(grpc_pollset_worker **root_worker, |
| 799 | grpc_pollset_worker *worker, pwlinks link) { |
| 800 | if (*root_worker == NULL) { |
| 801 | *root_worker = worker; |
| 802 | worker->links[link].next = worker->links[link].prev = worker; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 803 | return true; |
| 804 | } else { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 805 | worker->links[link].next = *root_worker; |
| 806 | worker->links[link].prev = worker->links[link].next->links[link].prev; |
| 807 | worker->links[link].next->links[link].prev = worker; |
| 808 | worker->links[link].prev->links[link].next = worker; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 809 | return false; |
| 810 | } |
| 811 | } |
| 812 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 813 | /* returns the new root IFF the root changed */ |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 814 | typedef enum { WRR_NEW_ROOT, WRR_EMPTIED, WRR_REMOVED } worker_remove_result; |
| 815 | |
| 816 | static worker_remove_result worker_remove(grpc_pollset_worker **root_worker, |
| 817 | grpc_pollset_worker *worker, |
| 818 | pwlinks link) { |
| 819 | if (worker == *root_worker) { |
| 820 | if (worker == worker->links[link].next) { |
| 821 | *root_worker = NULL; |
| 822 | return WRR_EMPTIED; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 823 | } else { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 824 | *root_worker = worker->links[link].next; |
| 825 | worker->links[link].prev->links[link].next = worker->links[link].next; |
| 826 | worker->links[link].next->links[link].prev = worker->links[link].prev; |
| 827 | return WRR_NEW_ROOT; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 828 | } |
| 829 | } else { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 830 | worker->links[link].prev->links[link].next = worker->links[link].next; |
| 831 | worker->links[link].next->links[link].prev = worker->links[link].prev; |
| 832 | return WRR_REMOVED; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 833 | } |
| 834 | } |
| 835 | |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 836 | /* Return true if this thread should poll */ |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 837 | static bool begin_worker(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 838 | grpc_pollset_worker *worker, |
| 839 | grpc_pollset_worker **worker_hdl, |
| 840 | grpc_millis deadline) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 841 | bool do_poll = true; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 842 | if (worker_hdl != NULL) *worker_hdl = worker; |
Craig Tiller | 9f01251 | 2017-04-13 15:37:14 -0700 | [diff] [blame] | 843 | worker->initialized_cv = false; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 844 | worker->kicked = false; |
| 845 | worker->pollset = pollset; |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 846 | worker->pollable_obj = |
| 847 | POLLABLE_REF(pollset->active_pollable, "pollset_worker"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 848 | worker_insert(&pollset->root_worker, worker, PWLINK_POLLSET); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 849 | gpr_mu_lock(&worker->pollable_obj->mu); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 850 | if (!worker_insert(&worker->pollable_obj->root_worker, worker, |
| 851 | PWLINK_POLLABLE)) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 852 | worker->initialized_cv = true; |
| 853 | gpr_cv_init(&worker->cv); |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 854 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 855 | if (GRPC_TRACER_ON(grpc_polling_trace) && |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 856 | worker->pollable_obj->root_worker != worker) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 857 | 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] | 858 | worker->pollable_obj, worker, |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 859 | poll_deadline_to_millis_timeout(exec_ctx, deadline)); |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 860 | } |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 861 | while (do_poll && worker->pollable_obj->root_worker != worker) { |
Craig Tiller | 6b9a99c | 2017-10-12 00:27:00 +0000 | [diff] [blame] | 862 | if (gpr_cv_wait(&worker->cv, &worker->pollable_obj->mu, |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 863 | grpc_millis_to_timespec(deadline, GPR_CLOCK_REALTIME))) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 864 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 865 | gpr_log(GPR_DEBUG, "PS:%p timeout_wait %p w=%p", pollset, |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 866 | worker->pollable_obj, worker); |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 867 | } |
| 868 | do_poll = false; |
| 869 | } else if (worker->kicked) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 870 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 871 | gpr_log(GPR_DEBUG, "PS:%p wakeup %p w=%p", pollset, |
| 872 | worker->pollable_obj, worker); |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 873 | } |
| 874 | do_poll = false; |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 875 | } else if (GRPC_TRACER_ON(grpc_polling_trace) && |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 876 | worker->pollable_obj->root_worker != worker) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 877 | gpr_log(GPR_DEBUG, "PS:%p spurious_wakeup %p w=%p", pollset, |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 878 | worker->pollable_obj, worker); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 879 | } |
| 880 | } |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 881 | grpc_exec_ctx_invalidate_now(exec_ctx); |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 882 | } else { |
| 883 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 884 | } |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 885 | gpr_mu_unlock(&worker->pollable_obj->mu); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 886 | |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 887 | return do_poll; |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame^] | 888 | // && pollset->shutdown_closure == NULL && pollset->active_pollable == |
| 889 | // worker->pollable_obj; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 890 | } |
| 891 | |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 892 | static void end_worker(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 893 | grpc_pollset_worker *worker, |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 894 | grpc_pollset_worker **worker_hdl) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 895 | gpr_mu_lock(&worker->pollable_obj->mu); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 896 | if (worker_remove(&worker->pollable_obj->root_worker, worker, |
| 897 | PWLINK_POLLABLE) == WRR_NEW_ROOT) { |
| 898 | grpc_pollset_worker *new_root = worker->pollable_obj->root_worker; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 899 | GPR_ASSERT(new_root->initialized_cv); |
| 900 | gpr_cv_signal(&new_root->cv); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 901 | } |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 902 | gpr_mu_unlock(&worker->pollable_obj->mu); |
| 903 | POLLABLE_UNREF(worker->pollable_obj, "pollset_worker"); |
| 904 | gpr_mu_lock(&pollset->mu); |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame^] | 905 | if (worker_remove(&pollset->root_worker, worker, PWLINK_POLLSET) == |
| 906 | WRR_EMPTIED) { |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 907 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
| 908 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 909 | if (worker->initialized_cv) { |
| 910 | gpr_cv_destroy(&worker->cv); |
| 911 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 912 | } |
| 913 | |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 914 | static long gettid(void) { return syscall(__NR_gettid); } |
| 915 | |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 916 | /* pollset->po.mu lock must be held by the caller before calling this. |
| 917 | The function pollset_work() may temporarily release the lock (pollset->po.mu) |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 918 | during the course of its execution but it will always re-acquire the lock and |
| 919 | ensure that it is held by the time the function returns */ |
| 920 | static grpc_error *pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 921 | grpc_pollset_worker **worker_hdl, |
Craig Tiller | 2039779 | 2017-07-18 11:35:27 -0700 | [diff] [blame] | 922 | grpc_millis deadline) { |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 923 | #ifdef GRPC_EPOLLEX_CREATE_WORKERS_ON_HEAP |
Craig Tiller | 513daab | 2017-10-06 09:18:34 -0700 | [diff] [blame] | 924 | grpc_pollset_worker *worker = |
| 925 | (grpc_pollset_worker *)gpr_malloc(sizeof(*worker)); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 926 | #define WORKER_PTR (worker) |
| 927 | #else |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 928 | grpc_pollset_worker worker; |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 929 | #define WORKER_PTR (&worker) |
| 930 | #endif |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 931 | WORKER_PTR->originator = gettid(); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 932 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | bfec10f | 2017-10-11 17:31:06 -0700 | [diff] [blame] | 933 | gpr_log(GPR_DEBUG, "PS:%p work hdl=%p worker=%p now=%" PRIdPTR |
| 934 | " deadline=%" PRIdPTR " kwp=%d pollable=%p", |
| 935 | pollset, worker_hdl, WORKER_PTR, grpc_exec_ctx_now(exec_ctx), |
| 936 | deadline, pollset->kicked_without_poller, pollset->active_pollable); |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 937 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 938 | static const char *err_desc = "pollset_work"; |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 939 | grpc_error *error = GRPC_ERROR_NONE; |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 940 | if (pollset->kicked_without_poller) { |
| 941 | pollset->kicked_without_poller = false; |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 942 | } else { |
Craig Tiller | 6b9a99c | 2017-10-12 00:27:00 +0000 | [diff] [blame] | 943 | if (begin_worker(exec_ctx, pollset, WORKER_PTR, worker_hdl, deadline)) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 944 | gpr_tls_set(&g_current_thread_pollset, (intptr_t)pollset); |
| 945 | gpr_tls_set(&g_current_thread_worker, (intptr_t)WORKER_PTR); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 946 | if (pollset->event_cursor == pollset->event_count) { |
Craig Tiller | bfec10f | 2017-10-11 17:31:06 -0700 | [diff] [blame] | 947 | append_error(&error, pollset_epoll(exec_ctx, pollset, |
| 948 | WORKER_PTR->pollable_obj, deadline), |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 949 | err_desc); |
| 950 | } |
| 951 | append_error(&error, pollset_process_events(exec_ctx, pollset, false), |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 952 | err_desc); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 953 | grpc_exec_ctx_flush(exec_ctx); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 954 | gpr_tls_set(&g_current_thread_pollset, 0); |
| 955 | gpr_tls_set(&g_current_thread_worker, 0); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 956 | } |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 957 | end_worker(exec_ctx, pollset, WORKER_PTR, worker_hdl); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 958 | } |
| 959 | #ifdef GRPC_EPOLLEX_CREATE_WORKERS_ON_HEAP |
| 960 | gpr_free(worker); |
| 961 | #endif |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 962 | return error; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 963 | } |
| 964 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 965 | static grpc_error *pollset_transition_pollable_from_empty_to_fd_locked( |
| 966 | grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, grpc_fd *fd) { |
| 967 | static const char *err_desc = "pollset_transition_pollable_from_empty_to_fd"; |
| 968 | grpc_error *error = GRPC_ERROR_NONE; |
| 969 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 970 | gpr_log(GPR_DEBUG, |
| 971 | "PS:%p add fd %p (%d); transition pollable from empty to fd", |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 972 | pollset, fd, fd->fd); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 973 | } |
| 974 | append_error(&error, pollset_kick_all(exec_ctx, pollset), err_desc); |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 975 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 976 | append_error(&error, fd_become_pollable(fd, &pollset->active_pollable), |
| 977 | err_desc); |
| 978 | return error; |
| 979 | } |
| 980 | |
| 981 | static grpc_error *pollset_transition_pollable_from_fd_to_multi_locked( |
| 982 | grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, grpc_fd *and_add_fd) { |
| 983 | static const char *err_desc = "pollset_transition_pollable_from_fd_to_multi"; |
| 984 | grpc_error *error = GRPC_ERROR_NONE; |
| 985 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 986 | gpr_log( |
| 987 | GPR_DEBUG, |
| 988 | "PS:%p add fd %p (%d); transition pollable from fd %p to multipoller", |
| 989 | pollset, and_add_fd, and_add_fd ? and_add_fd->fd : -1, |
| 990 | pollset->active_pollable->owner_fd); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 991 | } |
| 992 | append_error(&error, pollset_kick_all(exec_ctx, pollset), err_desc); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 993 | grpc_fd *initial_fd = pollset->active_pollable->owner_fd; |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 994 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
| 995 | pollset->active_pollable = NULL; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 996 | if (append_error(&error, pollable_create(PO_MULTI, &pollset->active_pollable), |
| 997 | err_desc)) { |
| 998 | append_error(&error, pollable_add_fd(pollset->active_pollable, initial_fd), |
| 999 | err_desc); |
| 1000 | if (and_add_fd != NULL) { |
| 1001 | append_error(&error, |
| 1002 | pollable_add_fd(pollset->active_pollable, and_add_fd), |
| 1003 | err_desc); |
| 1004 | } |
| 1005 | } |
| 1006 | return error; |
| 1007 | } |
| 1008 | |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1009 | /* expects pollsets locked, flag whether fd is locked or not */ |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 1010 | static grpc_error *pollset_add_fd_locked(grpc_exec_ctx *exec_ctx, |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1011 | grpc_pollset *pollset, grpc_fd *fd) { |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1012 | grpc_error *error = GRPC_ERROR_NONE; |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1013 | pollable *po_at_start = |
| 1014 | POLLABLE_REF(pollset->active_pollable, "pollset_add_fd"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1015 | switch (pollset->active_pollable->type) { |
| 1016 | case PO_EMPTY: |
| 1017 | /* empty pollable --> single fd pollable */ |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1018 | error = pollset_transition_pollable_from_empty_to_fd_locked(exec_ctx, |
| 1019 | pollset, fd); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1020 | break; |
| 1021 | case PO_FD: |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1022 | gpr_mu_lock(&po_at_start->owner_fd->orphan_mu); |
Craig Tiller | d8d9f57 | 2017-10-04 16:10:23 -0700 | [diff] [blame] | 1023 | if ((gpr_atm_no_barrier_load(&pollset->active_pollable->owner_fd->refst) & |
| 1024 | 1) == 0) { |
| 1025 | error = pollset_transition_pollable_from_empty_to_fd_locked( |
| 1026 | exec_ctx, pollset, fd); |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1027 | } else { |
| 1028 | /* fd --> multipoller */ |
Craig Tiller | d8d9f57 | 2017-10-04 16:10:23 -0700 | [diff] [blame] | 1029 | error = pollset_transition_pollable_from_fd_to_multi_locked( |
| 1030 | exec_ctx, pollset, fd); |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1031 | } |
| 1032 | gpr_mu_unlock(&po_at_start->owner_fd->orphan_mu); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1033 | break; |
| 1034 | case PO_MULTI: |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1035 | error = pollable_add_fd(pollset->active_pollable, fd); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1036 | break; |
| 1037 | } |
| 1038 | if (error != GRPC_ERROR_NONE) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1039 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1040 | pollset->active_pollable = po_at_start; |
| 1041 | } else { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1042 | POLLABLE_UNREF(po_at_start, "pollset_add_fd"); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 1043 | } |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1044 | return error; |
| 1045 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 1046 | |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 1047 | static grpc_error *pollset_as_multipollable_locked(grpc_exec_ctx *exec_ctx, |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame^] | 1048 | grpc_pollset *pollset, |
| 1049 | pollable **pollable_obj) { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1050 | grpc_error *error = GRPC_ERROR_NONE; |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1051 | pollable *po_at_start = |
| 1052 | POLLABLE_REF(pollset->active_pollable, "pollset_as_multipollable"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1053 | switch (pollset->active_pollable->type) { |
| 1054 | case PO_EMPTY: |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1055 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1056 | error = pollable_create(PO_MULTI, &pollset->active_pollable); |
| 1057 | break; |
| 1058 | case PO_FD: |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1059 | gpr_mu_lock(&po_at_start->owner_fd->orphan_mu); |
Craig Tiller | d8d9f57 | 2017-10-04 16:10:23 -0700 | [diff] [blame] | 1060 | if ((gpr_atm_no_barrier_load(&pollset->active_pollable->owner_fd->refst) & |
| 1061 | 1) == 0) { |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1062 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
| 1063 | error = pollable_create(PO_MULTI, &pollset->active_pollable); |
| 1064 | } else { |
| 1065 | error = pollset_transition_pollable_from_fd_to_multi_locked( |
| 1066 | exec_ctx, pollset, NULL); |
| 1067 | } |
| 1068 | gpr_mu_unlock(&po_at_start->owner_fd->orphan_mu); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1069 | break; |
| 1070 | case PO_MULTI: |
| 1071 | break; |
| 1072 | } |
| 1073 | if (error != GRPC_ERROR_NONE) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1074 | POLLABLE_UNREF(pollset->active_pollable, "pollset"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1075 | pollset->active_pollable = po_at_start; |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1076 | *pollable_obj = NULL; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1077 | } else { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1078 | *pollable_obj = POLLABLE_REF(pollset->active_pollable, "pollset_set"); |
| 1079 | POLLABLE_UNREF(po_at_start, "pollset_as_multipollable"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1080 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1081 | return error; |
| 1082 | } |
| 1083 | |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1084 | static void pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 1085 | grpc_fd *fd) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1086 | gpr_mu_lock(&pollset->mu); |
| 1087 | grpc_error *error = pollset_add_fd_locked(exec_ctx, pollset, fd); |
| 1088 | gpr_mu_unlock(&pollset->mu); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 1089 | GRPC_LOG_IF_ERROR("pollset_add_fd", error); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1090 | } |
| 1091 | |
| 1092 | /******************************************************************************* |
| 1093 | * Pollset-set Definitions |
| 1094 | */ |
| 1095 | |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1096 | static grpc_pollset_set *pss_lock_adam(grpc_pollset_set *pss) { |
| 1097 | gpr_mu_lock(&pss->mu); |
| 1098 | while (pss->parent != NULL) { |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1099 | gpr_mu_unlock(&pss->mu); |
| 1100 | pss = pss->parent; |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1101 | gpr_mu_lock(&pss->mu); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1102 | } |
| 1103 | return pss; |
| 1104 | } |
| 1105 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1106 | static grpc_pollset_set *pollset_set_create(void) { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1107 | grpc_pollset_set *pss = (grpc_pollset_set *)gpr_zalloc(sizeof(*pss)); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1108 | gpr_mu_init(&pss->mu); |
| 1109 | gpr_ref_init(&pss->refs, 1); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1110 | return pss; |
| 1111 | } |
| 1112 | |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1113 | static void pollset_set_unref(grpc_exec_ctx *exec_ctx, grpc_pollset_set *pss) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1114 | if (pss == NULL) return; |
| 1115 | if (!gpr_unref(&pss->refs)) return; |
| 1116 | pollset_set_unref(exec_ctx, pss->parent); |
| 1117 | gpr_mu_destroy(&pss->mu); |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1118 | for (size_t i = 0; i < pss->pollset_count; i++) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1119 | POLLABLE_UNREF(pss->pollsets[i], "pollset_set"); |
| 1120 | } |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1121 | for (size_t i = 0; i < pss->fd_count; i++) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1122 | UNREF_BY(exec_ctx, pss->fds[i], 2, "pollset_set"); |
| 1123 | } |
| 1124 | gpr_free(pss->pollsets); |
| 1125 | gpr_free(pss->fds); |
| 1126 | gpr_free(pss); |
| 1127 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1128 | |
| 1129 | static void pollset_set_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset_set *pss, |
| 1130 | grpc_fd *fd) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1131 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 1132 | gpr_log(GPR_DEBUG, "PSS:%p: add fd %p (%d)", pss, fd, fd->fd); |
| 1133 | } |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1134 | grpc_error *error = GRPC_ERROR_NONE; |
| 1135 | static const char *err_desc = "pollset_set_add_fd"; |
| 1136 | pss = pss_lock_adam(pss); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1137 | for (size_t i = 0; i < pss->pollset_count; i++) { |
| 1138 | append_error(&error, pollable_add_fd(pss->pollsets[i], fd), err_desc); |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1139 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1140 | if (pss->fd_count == pss->fd_capacity) { |
| 1141 | pss->fd_capacity = GPR_MAX(pss->fd_capacity * 2, 8); |
Craig Tiller | 513daab | 2017-10-06 09:18:34 -0700 | [diff] [blame] | 1142 | pss->fds = |
| 1143 | (grpc_fd **)gpr_realloc(pss->fds, pss->fd_capacity * sizeof(*pss->fds)); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1144 | } |
| 1145 | REF_BY(fd, 2, "pollset_set"); |
| 1146 | pss->fds[pss->fd_count++] = fd; |
Craig Tiller | 249de2b | 2017-10-02 11:49:19 -0700 | [diff] [blame] | 1147 | gpr_mu_unlock(&pss->mu); |
| 1148 | |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1149 | GRPC_LOG_IF_ERROR(err_desc, error); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1150 | } |
| 1151 | |
| 1152 | static void pollset_set_del_fd(grpc_exec_ctx *exec_ctx, grpc_pollset_set *pss, |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1153 | grpc_fd *fd) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1154 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 1155 | gpr_log(GPR_DEBUG, "PSS:%p: del fd %p", pss, fd); |
| 1156 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1157 | pss = pss_lock_adam(pss); |
| 1158 | size_t i; |
| 1159 | for (i = 0; i < pss->fd_count; i++) { |
| 1160 | if (pss->fds[i] == fd) { |
| 1161 | UNREF_BY(exec_ctx, fd, 2, "pollset_set"); |
| 1162 | break; |
| 1163 | } |
| 1164 | } |
| 1165 | GPR_ASSERT(i != pss->fd_count); |
| 1166 | for (; i < pss->fd_count - 1; i++) { |
| 1167 | pss->fds[i] = pss->fds[i + 1]; |
| 1168 | } |
| 1169 | pss->fd_count--; |
| 1170 | gpr_mu_unlock(&pss->mu); |
| 1171 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1172 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1173 | static void pollset_set_del_pollset(grpc_exec_ctx *exec_ctx, |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1174 | grpc_pollset_set *pss, grpc_pollset *ps) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1175 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 1176 | gpr_log(GPR_DEBUG, "PSS:%p: del pollset %p", pss, ps); |
| 1177 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1178 | pss = pss_lock_adam(pss); |
| 1179 | size_t i; |
| 1180 | for (i = 0; i < pss->pollset_count; i++) { |
| 1181 | if (pss->pollsets[i] == ps->active_pollable) { |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1182 | POLLABLE_UNREF(pss->pollsets[i], "pollset_set"); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1183 | break; |
| 1184 | } |
| 1185 | } |
| 1186 | GPR_ASSERT(i != pss->pollset_count); |
| 1187 | for (; i < pss->pollset_count - 1; i++) { |
| 1188 | pss->pollsets[i] = pss->pollsets[i + 1]; |
| 1189 | } |
| 1190 | pss->pollset_count--; |
| 1191 | gpr_mu_unlock(&pss->mu); |
Craig Tiller | ad059f7 | 2017-10-12 22:47:05 +0000 | [diff] [blame] | 1192 | gpr_mu_lock(&ps->mu); |
| 1193 | if (0 == --ps->containing_pollset_set_count) { |
| 1194 | pollset_maybe_finish_shutdown(exec_ctx, ps); |
| 1195 | } |
| 1196 | gpr_mu_unlock(&ps->mu); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1197 | } |
| 1198 | |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1199 | // add all fds to pollables, and output a new array of unorphaned out_fds |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1200 | static grpc_error *add_fds_to_pollables(grpc_exec_ctx *exec_ctx, grpc_fd **fds, |
| 1201 | size_t fd_count, pollable **pollables, |
| 1202 | size_t pollable_count, |
Craig Tiller | d8d9f57 | 2017-10-04 16:10:23 -0700 | [diff] [blame] | 1203 | const char *err_desc, grpc_fd **out_fds, |
| 1204 | size_t *out_fd_count) { |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1205 | grpc_error *error = GRPC_ERROR_NONE; |
| 1206 | for (size_t i = 0; i < fd_count; i++) { |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1207 | gpr_mu_lock(&fds[i]->orphan_mu); |
| 1208 | if ((gpr_atm_no_barrier_load(&fds[i]->refst) & 1) == 0) { |
| 1209 | gpr_mu_unlock(&fds[i]->orphan_mu); |
| 1210 | UNREF_BY(exec_ctx, fds[i], 2, "pollset_set"); |
| 1211 | } else { |
| 1212 | for (size_t j = 0; j < pollable_count; j++) { |
| 1213 | append_error(&error, pollable_add_fd(pollables[j], fds[i]), err_desc); |
| 1214 | } |
| 1215 | gpr_mu_unlock(&fds[i]->orphan_mu); |
| 1216 | out_fds[(*out_fd_count)++] = fds[i]; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1217 | } |
| 1218 | } |
| 1219 | return error; |
| 1220 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1221 | |
Craig Tiller | 79c4f1f | 2017-10-12 01:12:40 +0000 | [diff] [blame] | 1222 | static void pollset_set_add_pollset(grpc_exec_ctx *exec_ctx, |
| 1223 | grpc_pollset_set *pss, grpc_pollset *ps) { |
| 1224 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 1225 | gpr_log(GPR_DEBUG, "PSS:%p: add pollset %p", pss, ps); |
| 1226 | } |
| 1227 | grpc_error *error = GRPC_ERROR_NONE; |
| 1228 | static const char *err_desc = "pollset_set_add_pollset"; |
| 1229 | pollable *pollable_obj = NULL; |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame^] | 1230 | gpr_mu_lock(&ps->mu); |
| 1231 | if (!GRPC_LOG_IF_ERROR(err_desc, pollset_as_multipollable_locked( |
| 1232 | exec_ctx, ps, &pollable_obj))) { |
Craig Tiller | 79c4f1f | 2017-10-12 01:12:40 +0000 | [diff] [blame] | 1233 | GPR_ASSERT(pollable_obj == NULL); |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame^] | 1234 | gpr_mu_unlock(&ps->mu); |
Craig Tiller | 79c4f1f | 2017-10-12 01:12:40 +0000 | [diff] [blame] | 1235 | return; |
| 1236 | } |
Craig Tiller | 1e8c2ab | 2017-10-12 15:50:13 -0700 | [diff] [blame^] | 1237 | ps->containing_pollset_set_count++; |
| 1238 | gpr_mu_unlock(&ps->mu); |
Craig Tiller | 79c4f1f | 2017-10-12 01:12:40 +0000 | [diff] [blame] | 1239 | pss = pss_lock_adam(pss); |
| 1240 | size_t initial_fd_count = pss->fd_count; |
| 1241 | pss->fd_count = 0; |
Craig Tiller | 3ca9115 | 2017-10-12 09:09:54 -0700 | [diff] [blame] | 1242 | append_error(&error, add_fds_to_pollables(exec_ctx, pss->fds, |
| 1243 | initial_fd_count, &pollable_obj, 1, |
| 1244 | err_desc, pss->fds, &pss->fd_count), |
Craig Tiller | 79c4f1f | 2017-10-12 01:12:40 +0000 | [diff] [blame] | 1245 | err_desc); |
| 1246 | if (pss->pollset_count == pss->pollset_capacity) { |
| 1247 | pss->pollset_capacity = GPR_MAX(pss->pollset_capacity * 2, 8); |
| 1248 | pss->pollsets = (pollable **)gpr_realloc( |
| 1249 | pss->pollsets, pss->pollset_capacity * sizeof(*pss->pollsets)); |
| 1250 | } |
| 1251 | pss->pollsets[pss->pollset_count++] = pollable_obj; |
| 1252 | gpr_mu_unlock(&pss->mu); |
| 1253 | |
| 1254 | GRPC_LOG_IF_ERROR(err_desc, error); |
| 1255 | } |
| 1256 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1257 | static void pollset_set_add_pollset_set(grpc_exec_ctx *exec_ctx, |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1258 | grpc_pollset_set *a, |
| 1259 | grpc_pollset_set *b) { |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1260 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 1261 | gpr_log(GPR_DEBUG, "PSS: merge (%p, %p)", a, b); |
| 1262 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1263 | grpc_error *error = GRPC_ERROR_NONE; |
| 1264 | static const char *err_desc = "pollset_set_add_fd"; |
| 1265 | for (;;) { |
| 1266 | if (a == b) { |
| 1267 | // pollset ancestors are the same: nothing to do |
| 1268 | return; |
| 1269 | } |
| 1270 | if (a > b) { |
| 1271 | GPR_SWAP(grpc_pollset_set *, a, b); |
| 1272 | } |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1273 | gpr_mu *a_mu = &a->mu; |
| 1274 | gpr_mu *b_mu = &b->mu; |
| 1275 | gpr_mu_lock(a_mu); |
| 1276 | gpr_mu_lock(b_mu); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1277 | if (a->parent != NULL) { |
| 1278 | a = a->parent; |
| 1279 | } else if (b->parent != NULL) { |
| 1280 | b = b->parent; |
| 1281 | } else { |
| 1282 | break; // exit loop, both pollsets locked |
| 1283 | } |
Craig Tiller | c5ce057 | 2017-10-03 23:09:41 +0000 | [diff] [blame] | 1284 | gpr_mu_unlock(a_mu); |
| 1285 | gpr_mu_unlock(b_mu); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1286 | } |
| 1287 | // try to do the least copying possible |
| 1288 | // TODO(ctiller): there's probably a better heuristic here |
| 1289 | const size_t a_size = a->fd_count + a->pollset_count; |
| 1290 | const size_t b_size = b->fd_count + b->pollset_count; |
| 1291 | if (b_size > a_size) { |
| 1292 | GPR_SWAP(grpc_pollset_set *, a, b); |
| 1293 | } |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1294 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 1295 | gpr_log(GPR_DEBUG, "PSS: parent %p to %p", b, a); |
| 1296 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1297 | gpr_ref(&a->refs); |
| 1298 | b->parent = a; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1299 | if (a->fd_capacity < a->fd_count + b->fd_count) { |
| 1300 | a->fd_capacity = GPR_MAX(2 * a->fd_capacity, a->fd_count + b->fd_count); |
Craig Tiller | 513daab | 2017-10-06 09:18:34 -0700 | [diff] [blame] | 1301 | 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] | 1302 | } |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1303 | size_t initial_a_fd_count = a->fd_count; |
| 1304 | a->fd_count = 0; |
Craig Tiller | d8d9f57 | 2017-10-04 16:10:23 -0700 | [diff] [blame] | 1305 | append_error(&error, add_fds_to_pollables( |
| 1306 | exec_ctx, a->fds, initial_a_fd_count, b->pollsets, |
| 1307 | b->pollset_count, "merge_a2b", a->fds, &a->fd_count), |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1308 | err_desc); |
Craig Tiller | d8d9f57 | 2017-10-04 16:10:23 -0700 | [diff] [blame] | 1309 | append_error(&error, add_fds_to_pollables(exec_ctx, b->fds, b->fd_count, |
| 1310 | a->pollsets, a->pollset_count, |
| 1311 | "merge_b2a", a->fds, &a->fd_count), |
Craig Tiller | 4fd6a41 | 2017-10-04 22:41:13 +0000 | [diff] [blame] | 1312 | err_desc); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1313 | if (a->pollset_capacity < a->pollset_count + b->pollset_count) { |
| 1314 | a->pollset_capacity = |
| 1315 | GPR_MAX(2 * a->pollset_capacity, a->pollset_count + b->pollset_count); |
Craig Tiller | 513daab | 2017-10-06 09:18:34 -0700 | [diff] [blame] | 1316 | a->pollsets = (pollable **)gpr_realloc( |
| 1317 | a->pollsets, a->pollset_capacity * sizeof(*a->pollsets)); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1318 | } |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1319 | memcpy(a->pollsets + a->pollset_count, b->pollsets, |
| 1320 | b->pollset_count * sizeof(*b->pollsets)); |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1321 | a->pollset_count += b->pollset_count; |
| 1322 | gpr_free(b->fds); |
| 1323 | gpr_free(b->pollsets); |
Craig Tiller | 90a9d7d | 2017-10-04 21:24:03 +0000 | [diff] [blame] | 1324 | b->fds = NULL; |
| 1325 | b->pollsets = NULL; |
Craig Tiller | 23adbd5 | 2017-10-02 15:29:18 -0700 | [diff] [blame] | 1326 | b->fd_count = b->fd_capacity = b->pollset_count = b->pollset_capacity = 0; |
| 1327 | gpr_mu_unlock(&a->mu); |
| 1328 | gpr_mu_unlock(&b->mu); |
| 1329 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1330 | |
| 1331 | static void pollset_set_del_pollset_set(grpc_exec_ctx *exec_ctx, |
| 1332 | grpc_pollset_set *bag, |
Craig Tiller | f081d89 | 2017-04-07 14:04:42 -0700 | [diff] [blame] | 1333 | grpc_pollset_set *item) {} |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1334 | |
| 1335 | /******************************************************************************* |
| 1336 | * Event engine binding |
| 1337 | */ |
| 1338 | |
| 1339 | static void shutdown_engine(void) { |
| 1340 | fd_global_shutdown(); |
| 1341 | pollset_global_shutdown(); |
| 1342 | } |
| 1343 | |
| 1344 | static const grpc_event_engine_vtable vtable = { |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1345 | sizeof(grpc_pollset), |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1346 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1347 | fd_create, |
| 1348 | fd_wrapped_fd, |
| 1349 | fd_orphan, |
| 1350 | fd_shutdown, |
| 1351 | fd_notify_on_read, |
| 1352 | fd_notify_on_write, |
| 1353 | fd_is_shutdown, |
| 1354 | fd_get_read_notifier_pollset, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1355 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1356 | pollset_init, |
| 1357 | pollset_shutdown, |
| 1358 | pollset_destroy, |
| 1359 | pollset_work, |
| 1360 | pollset_kick, |
| 1361 | pollset_add_fd, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1362 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1363 | pollset_set_create, |
Craig Tiller | 29a9c3a | 2017-10-04 15:15:04 -0700 | [diff] [blame] | 1364 | pollset_set_unref, // destroy ==> unref 1 public ref |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1365 | pollset_set_add_pollset, |
| 1366 | pollset_set_del_pollset, |
| 1367 | pollset_set_add_pollset_set, |
| 1368 | pollset_set_del_pollset_set, |
| 1369 | pollset_set_add_fd, |
| 1370 | pollset_set_del_fd, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1371 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame] | 1372 | shutdown_engine, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1373 | }; |
| 1374 | |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 1375 | const grpc_event_engine_vtable *grpc_init_epollex_linux( |
| 1376 | bool explicitly_requested) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1377 | if (!grpc_has_wakeup_fd()) { |
| 1378 | return NULL; |
| 1379 | } |
| 1380 | |
Craig Tiller | 819cd88 | 2017-04-25 13:18:22 -0700 | [diff] [blame] | 1381 | if (!grpc_is_epollexclusive_available()) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1382 | return NULL; |
| 1383 | } |
| 1384 | |
Craig Tiller | 14ee7c3 | 2017-10-04 19:34:09 -0700 | [diff] [blame] | 1385 | #ifndef NDEBUG |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1386 | grpc_register_tracer(&grpc_trace_pollable_refcount); |
Craig Tiller | 14ee7c3 | 2017-10-04 19:34:09 -0700 | [diff] [blame] | 1387 | #endif |
Craig Tiller | 389ea90 | 2017-10-04 17:42:49 +0000 | [diff] [blame] | 1388 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1389 | fd_global_init(); |
| 1390 | |
| 1391 | if (!GRPC_LOG_IF_ERROR("pollset_global_init", pollset_global_init())) { |
Craig Tiller | 54d388d | 2017-04-14 16:20:45 -0700 | [diff] [blame] | 1392 | pollset_global_shutdown(); |
| 1393 | fd_global_shutdown(); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1394 | return NULL; |
| 1395 | } |
| 1396 | |
| 1397 | return &vtable; |
| 1398 | } |
| 1399 | |
| 1400 | #else /* defined(GRPC_LINUX_EPOLL) */ |
| 1401 | #if defined(GRPC_POSIX_SOCKET) |
Yash Tibrewal | 1cac223 | 2017-09-26 11:31:11 -0700 | [diff] [blame] | 1402 | #include "src/core/lib/iomgr/ev_epollex_linux.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1403 | /* If GRPC_LINUX_EPOLL is not defined, it means epoll is not available. Return |
| 1404 | * NULL */ |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 1405 | const grpc_event_engine_vtable *grpc_init_epollex_linux( |
| 1406 | bool explicitly_requested) { |
| 1407 | return NULL; |
| 1408 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1409 | #endif /* defined(GRPC_POSIX_SOCKET) */ |
| 1410 | |
| 1411 | #endif /* !defined(GRPC_LINUX_EPOLL) */ |