Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 3 | * Copyright 2017 gRPC authors. |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 4 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 8 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 10 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 16 | * |
| 17 | */ |
| 18 | |
| 19 | #include "src/core/lib/iomgr/port.h" |
| 20 | |
| 21 | /* This polling engine is only relevant on linux kernels supporting epoll() */ |
| 22 | #ifdef GRPC_LINUX_EPOLL |
| 23 | |
Craig Tiller | c610985 | 2017-05-01 14:26:49 -0700 | [diff] [blame] | 24 | #include "src/core/lib/iomgr/ev_epollex_linux.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 25 | |
| 26 | #include <assert.h> |
| 27 | #include <errno.h> |
| 28 | #include <poll.h> |
| 29 | #include <pthread.h> |
| 30 | #include <string.h> |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 31 | #include <sys/socket.h> |
| 32 | #include <unistd.h> |
| 33 | |
| 34 | #include <grpc/support/alloc.h> |
| 35 | #include <grpc/support/log.h> |
| 36 | #include <grpc/support/string_util.h> |
| 37 | #include <grpc/support/tls.h> |
| 38 | #include <grpc/support/useful.h> |
| 39 | |
Craig Tiller | b4bb1cd | 2017-07-20 14:18:17 -0700 | [diff] [blame] | 40 | #include "src/core/lib/debug/stats.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 41 | #include "src/core/lib/iomgr/ev_posix.h" |
| 42 | #include "src/core/lib/iomgr/iomgr_internal.h" |
Craig Tiller | 819cd88 | 2017-04-25 13:18:22 -0700 | [diff] [blame] | 43 | #include "src/core/lib/iomgr/is_epollexclusive_available.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 44 | #include "src/core/lib/iomgr/lockfree_event.h" |
Craig Tiller | 819cd88 | 2017-04-25 13:18:22 -0700 | [diff] [blame] | 45 | #include "src/core/lib/iomgr/sys_epoll_wrapper.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 46 | #include "src/core/lib/iomgr/timer.h" |
| 47 | #include "src/core/lib/iomgr/wakeup_fd_posix.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 48 | #include "src/core/lib/profiling/timers.h" |
| 49 | #include "src/core/lib/support/block_annotate.h" |
Craig Tiller | 0b4c901 | 2017-04-06 17:19:37 -0700 | [diff] [blame] | 50 | #include "src/core/lib/support/spinlock.h" |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 51 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 52 | /******************************************************************************* |
Sree Kuchibhotla | 5efc913 | 2017-08-17 14:10:38 -0700 | [diff] [blame] | 53 | * Polling object |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 54 | */ |
| 55 | |
| 56 | typedef enum { |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 57 | PO_POLLING_GROUP, |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 58 | PO_POLLSET_SET, |
| 59 | PO_POLLSET, |
| 60 | PO_FD, /* ordering is important: we always want to lock pollsets before fds: |
| 61 | this guarantees that using an fd as a pollable is safe */ |
Craig Tiller | 911490c | 2017-04-14 16:19:57 -0700 | [diff] [blame] | 62 | PO_EMPTY_POLLABLE, |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 63 | PO_COUNT |
| 64 | } polling_obj_type; |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 65 | |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 66 | typedef struct polling_obj polling_obj; |
| 67 | typedef struct polling_group polling_group; |
| 68 | |
| 69 | struct polling_obj { |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 70 | gpr_mu mu; |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 71 | polling_obj_type type; |
| 72 | polling_group *group; |
| 73 | struct polling_obj *next; |
| 74 | struct polling_obj *prev; |
| 75 | }; |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 76 | |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 77 | struct polling_group { |
| 78 | polling_obj po; |
| 79 | gpr_refcount refs; |
| 80 | }; |
| 81 | |
| 82 | static void po_init(polling_obj *po, polling_obj_type type); |
| 83 | static void po_destroy(polling_obj *po); |
| 84 | static void po_join(grpc_exec_ctx *exec_ctx, polling_obj *a, polling_obj *b); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 85 | static int po_cmp(polling_obj *a, polling_obj *b); |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 86 | |
| 87 | static void pg_create(grpc_exec_ctx *exec_ctx, polling_obj **initial_po, |
| 88 | size_t initial_po_count); |
| 89 | static polling_group *pg_ref(polling_group *pg); |
| 90 | static void pg_unref(polling_group *pg); |
| 91 | static void pg_merge(grpc_exec_ctx *exec_ctx, polling_group *a, |
| 92 | polling_group *b); |
| 93 | static void pg_join(grpc_exec_ctx *exec_ctx, polling_group *pg, |
| 94 | polling_obj *po); |
Craig Tiller | bd412f9 | 2017-04-07 13:45:19 -0700 | [diff] [blame] | 95 | |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 96 | /******************************************************************************* |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 97 | * pollable Declarations |
| 98 | */ |
| 99 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 100 | typedef struct pollable { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 101 | polling_obj po; |
| 102 | int epfd; |
| 103 | grpc_wakeup_fd wakeup; |
| 104 | grpc_pollset_worker *root_worker; |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 105 | } pollable; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 106 | |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 107 | static const char *polling_obj_type_string(polling_obj_type t) { |
| 108 | switch (t) { |
Craig Tiller | 7fd8f67 | 2017-07-05 15:10:12 -0700 | [diff] [blame] | 109 | case PO_POLLING_GROUP: |
| 110 | return "polling_group"; |
| 111 | case PO_POLLSET_SET: |
| 112 | return "pollset_set"; |
| 113 | case PO_POLLSET: |
| 114 | return "pollset"; |
| 115 | case PO_FD: |
| 116 | return "fd"; |
| 117 | case PO_EMPTY_POLLABLE: |
| 118 | return "empty_pollable"; |
| 119 | case PO_COUNT: |
| 120 | return "<invalid:count>"; |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 121 | } |
| 122 | return "<invalid>"; |
| 123 | } |
| 124 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 125 | static char *pollable_desc(pollable *p) { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 126 | char *out; |
Craig Tiller | 7fd8f67 | 2017-07-05 15:10:12 -0700 | [diff] [blame] | 127 | gpr_asprintf(&out, "type=%s group=%p epfd=%d wakeup=%d", |
| 128 | polling_obj_type_string(p->po.type), p->po.group, p->epfd, |
| 129 | p->wakeup.read_fd); |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 130 | return out; |
| 131 | } |
| 132 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 133 | static pollable g_empty_pollable; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 134 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 135 | static void pollable_init(pollable *p, polling_obj_type type); |
| 136 | static void pollable_destroy(pollable *p); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 137 | /* ensure that p->epfd, p->wakeup are initialized; p->po.mu must be held */ |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 138 | static grpc_error *pollable_materialize(pollable *p); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 139 | |
| 140 | /******************************************************************************* |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 141 | * Fd Declarations |
| 142 | */ |
| 143 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 144 | struct grpc_fd { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 145 | pollable pollable_obj; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 146 | int fd; |
| 147 | /* refst format: |
| 148 | bit 0 : 1=Active / 0=Orphaned |
| 149 | bits 1-n : refcount |
| 150 | Ref/Unref by two to avoid altering the orphaned bit */ |
| 151 | gpr_atm refst; |
| 152 | |
| 153 | /* The fd is either closed or we relinquished control of it. In either |
| 154 | cases, this indicates that the 'fd' on this structure is no longer |
| 155 | valid */ |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 156 | gpr_mu orphaned_mu; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 157 | bool orphaned; |
| 158 | |
| 159 | gpr_atm read_closure; |
| 160 | gpr_atm write_closure; |
| 161 | |
| 162 | struct grpc_fd *freelist_next; |
| 163 | grpc_closure *on_done_closure; |
| 164 | |
| 165 | /* The pollset that last noticed that the fd is readable. The actual type |
| 166 | * stored in this is (grpc_pollset *) */ |
| 167 | gpr_atm read_notifier_pollset; |
| 168 | |
| 169 | grpc_iomgr_object iomgr_object; |
| 170 | }; |
| 171 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 172 | static void fd_global_init(void); |
| 173 | static void fd_global_shutdown(void); |
| 174 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 175 | /******************************************************************************* |
| 176 | * Pollset Declarations |
| 177 | */ |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 178 | |
| 179 | typedef struct pollset_worker_link { |
| 180 | grpc_pollset_worker *next; |
| 181 | grpc_pollset_worker *prev; |
| 182 | } pollset_worker_link; |
| 183 | |
| 184 | typedef enum { |
| 185 | PWL_POLLSET, |
| 186 | PWL_POLLABLE, |
| 187 | POLLSET_WORKER_LINK_COUNT |
| 188 | } pollset_worker_links; |
| 189 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 190 | struct grpc_pollset_worker { |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 191 | bool kicked; |
| 192 | bool initialized_cv; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 193 | pollset_worker_link links[POLLSET_WORKER_LINK_COUNT]; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 194 | gpr_cv cv; |
Craig Tiller | 9f01251 | 2017-04-13 15:37:14 -0700 | [diff] [blame] | 195 | grpc_pollset *pollset; |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 196 | pollable *pollable_obj; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 197 | }; |
| 198 | |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 199 | #define MAX_EPOLL_EVENTS 100 |
Craig Tiller | ca4fc66 | 2017-06-09 11:13:56 -0700 | [diff] [blame] | 200 | #define MAX_EPOLL_EVENTS_HANDLED_EACH_POLL_CALL 5 |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 201 | |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 202 | struct grpc_pollset { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 203 | pollable pollable_obj; |
Yash Tibrewal | 8f798e9 | 2017-09-13 15:45:47 -0700 | [diff] [blame] | 204 | pollable *current_pollable_obj; |
Craig Tiller | f7e0748 | 2017-05-18 10:13:53 -0700 | [diff] [blame] | 205 | int kick_alls_pending; |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 206 | bool kicked_without_poller; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 207 | grpc_closure *shutdown_closure; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 208 | grpc_pollset_worker *root_worker; |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 209 | |
| 210 | int event_cursor; |
| 211 | int event_count; |
| 212 | struct epoll_event events[MAX_EPOLL_EVENTS]; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 213 | }; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 214 | |
| 215 | /******************************************************************************* |
| 216 | * Pollset-set Declarations |
| 217 | */ |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 218 | struct grpc_pollset_set { |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 219 | polling_obj po; |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 220 | }; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 221 | |
| 222 | /******************************************************************************* |
| 223 | * Common helpers |
| 224 | */ |
| 225 | |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 226 | static bool append_error(grpc_error **composite, grpc_error *error, |
| 227 | const char *desc) { |
| 228 | if (error == GRPC_ERROR_NONE) return true; |
| 229 | if (*composite == GRPC_ERROR_NONE) { |
| 230 | *composite = GRPC_ERROR_CREATE_FROM_COPIED_STRING(desc); |
| 231 | } |
| 232 | *composite = grpc_error_add_child(*composite, error); |
| 233 | return false; |
| 234 | } |
| 235 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 236 | /******************************************************************************* |
| 237 | * Fd Definitions |
| 238 | */ |
| 239 | |
| 240 | /* We need to keep a freelist not because of any concerns of malloc performance |
| 241 | * but instead so that implementations with multiple threads in (for example) |
| 242 | * epoll_wait deal with the race between pollset removal and incoming poll |
| 243 | * notifications. |
| 244 | * |
| 245 | * The problem is that the poller ultimately holds a reference to this |
| 246 | * object, so it is very difficult to know when is safe to free it, at least |
| 247 | * without some expensive synchronization. |
| 248 | * |
| 249 | * If we keep the object freelisted, in the worst case losing this race just |
| 250 | * becomes a spurious read notification on a reused fd. |
| 251 | */ |
| 252 | |
| 253 | /* The alarm system needs to be able to wakeup 'some poller' sometimes |
| 254 | * (specifically when a new alarm needs to be triggered earlier than the next |
| 255 | * alarm 'epoch'). This wakeup_fd gives us something to alert on when such a |
| 256 | * case occurs. */ |
| 257 | |
| 258 | static grpc_fd *fd_freelist = NULL; |
| 259 | static gpr_mu fd_freelist_mu; |
| 260 | |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 261 | #ifndef NDEBUG |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 262 | #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] | 263 | #define UNREF_BY(ec, fd, n, reason) \ |
| 264 | unref_by(ec, fd, n, reason, __FILE__, __LINE__) |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 265 | static void ref_by(grpc_fd *fd, int n, const char *reason, const char *file, |
| 266 | int line) { |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 267 | if (GRPC_TRACER_ON(grpc_trace_fd_refcount)) { |
| 268 | gpr_log(GPR_DEBUG, |
| 269 | "FD %d %p ref %d %" PRIdPTR " -> %" PRIdPTR " [%s; %s:%d]", |
| 270 | fd->fd, fd, n, gpr_atm_no_barrier_load(&fd->refst), |
| 271 | gpr_atm_no_barrier_load(&fd->refst) + n, reason, file, line); |
| 272 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 273 | #else |
| 274 | #define REF_BY(fd, n, reason) ref_by(fd, n) |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 275 | #define UNREF_BY(ec, fd, n, reason) unref_by(ec, fd, n) |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 276 | static void ref_by(grpc_fd *fd, int n) { |
| 277 | #endif |
| 278 | GPR_ASSERT(gpr_atm_no_barrier_fetch_add(&fd->refst, n) > 0); |
| 279 | } |
| 280 | |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 281 | 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] | 282 | grpc_fd *fd = (grpc_fd *)arg; |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 283 | /* Add the fd to the freelist */ |
| 284 | grpc_iomgr_unregister_object(&fd->iomgr_object); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 285 | pollable_destroy(&fd->pollable_obj); |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 286 | gpr_mu_destroy(&fd->orphaned_mu); |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 287 | gpr_mu_lock(&fd_freelist_mu); |
| 288 | fd->freelist_next = fd_freelist; |
| 289 | fd_freelist = fd; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 290 | |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 291 | grpc_lfev_destroy(&fd->read_closure); |
| 292 | grpc_lfev_destroy(&fd->write_closure); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 293 | |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 294 | gpr_mu_unlock(&fd_freelist_mu); |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 295 | } |
| 296 | |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 297 | #ifndef NDEBUG |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 298 | static void unref_by(grpc_exec_ctx *exec_ctx, grpc_fd *fd, int n, |
| 299 | const char *reason, const char *file, int line) { |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 300 | if (GRPC_TRACER_ON(grpc_trace_fd_refcount)) { |
| 301 | gpr_log(GPR_DEBUG, |
| 302 | "FD %d %p unref %d %" PRIdPTR " -> %" PRIdPTR " [%s; %s:%d]", |
| 303 | fd->fd, fd, n, gpr_atm_no_barrier_load(&fd->refst), |
| 304 | gpr_atm_no_barrier_load(&fd->refst) - n, reason, file, line); |
| 305 | } |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 306 | #else |
| 307 | 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] | 308 | #endif |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 309 | gpr_atm old = gpr_atm_full_fetch_add(&fd->refst, -n); |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 310 | if (old == n) { |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 311 | GRPC_CLOSURE_SCHED(exec_ctx, GRPC_CLOSURE_CREATE(fd_destroy, fd, |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 312 | grpc_schedule_on_exec_ctx), |
| 313 | GRPC_ERROR_NONE); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 314 | } else { |
| 315 | GPR_ASSERT(old > n); |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | static void fd_global_init(void) { gpr_mu_init(&fd_freelist_mu); } |
| 320 | |
| 321 | static void fd_global_shutdown(void) { |
| 322 | gpr_mu_lock(&fd_freelist_mu); |
| 323 | gpr_mu_unlock(&fd_freelist_mu); |
| 324 | while (fd_freelist != NULL) { |
| 325 | grpc_fd *fd = fd_freelist; |
| 326 | fd_freelist = fd_freelist->freelist_next; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 327 | gpr_free(fd); |
| 328 | } |
| 329 | gpr_mu_destroy(&fd_freelist_mu); |
| 330 | } |
| 331 | |
| 332 | static grpc_fd *fd_create(int fd, const char *name) { |
| 333 | grpc_fd *new_fd = NULL; |
| 334 | |
| 335 | gpr_mu_lock(&fd_freelist_mu); |
| 336 | if (fd_freelist != NULL) { |
| 337 | new_fd = fd_freelist; |
| 338 | fd_freelist = fd_freelist->freelist_next; |
| 339 | } |
| 340 | gpr_mu_unlock(&fd_freelist_mu); |
| 341 | |
| 342 | if (new_fd == NULL) { |
Yash Tibrewal | ca3c1c0 | 2017-09-07 22:47:16 -0700 | [diff] [blame] | 343 | new_fd = (grpc_fd *)gpr_malloc(sizeof(grpc_fd)); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 344 | } |
| 345 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 346 | pollable_init(&new_fd->pollable_obj, PO_FD); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 347 | |
| 348 | gpr_atm_rel_store(&new_fd->refst, (gpr_atm)1); |
| 349 | new_fd->fd = fd; |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 350 | gpr_mu_init(&new_fd->orphaned_mu); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 351 | new_fd->orphaned = false; |
| 352 | grpc_lfev_init(&new_fd->read_closure); |
| 353 | grpc_lfev_init(&new_fd->write_closure); |
| 354 | gpr_atm_no_barrier_store(&new_fd->read_notifier_pollset, (gpr_atm)NULL); |
| 355 | |
| 356 | new_fd->freelist_next = NULL; |
| 357 | new_fd->on_done_closure = NULL; |
| 358 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 359 | char *fd_name; |
| 360 | gpr_asprintf(&fd_name, "%s fd=%d", name, fd); |
| 361 | grpc_iomgr_register_object(&new_fd->iomgr_object, fd_name); |
Noah Eisen | 264879f | 2017-06-20 17:14:47 -0700 | [diff] [blame] | 362 | #ifndef NDEBUG |
| 363 | if (GRPC_TRACER_ON(grpc_trace_fd_refcount)) { |
| 364 | gpr_log(GPR_DEBUG, "FD %d %p create %s", fd, new_fd, fd_name); |
| 365 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 366 | #endif |
| 367 | gpr_free(fd_name); |
| 368 | return new_fd; |
| 369 | } |
| 370 | |
| 371 | static int fd_wrapped_fd(grpc_fd *fd) { |
| 372 | int ret_fd = -1; |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 373 | gpr_mu_lock(&fd->orphaned_mu); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 374 | if (!fd->orphaned) { |
| 375 | ret_fd = fd->fd; |
| 376 | } |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 377 | gpr_mu_unlock(&fd->orphaned_mu); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 378 | |
| 379 | return ret_fd; |
| 380 | } |
| 381 | |
| 382 | static void fd_orphan(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 383 | grpc_closure *on_done, int *release_fd, |
Yuchen Zeng | d40a7ae | 2017-07-12 15:59:56 -0700 | [diff] [blame] | 384 | bool already_closed, const char *reason) { |
| 385 | bool is_fd_closed = already_closed; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 386 | grpc_error *error = GRPC_ERROR_NONE; |
| 387 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 388 | gpr_mu_lock(&fd->pollable_obj.po.mu); |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 389 | gpr_mu_lock(&fd->orphaned_mu); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 390 | fd->on_done_closure = on_done; |
| 391 | |
| 392 | /* If release_fd is not NULL, we should be relinquishing control of the file |
| 393 | descriptor fd->fd (but we still own the grpc_fd structure). */ |
| 394 | if (release_fd != NULL) { |
| 395 | *release_fd = fd->fd; |
Yuchen Zeng | d40a7ae | 2017-07-12 15:59:56 -0700 | [diff] [blame] | 396 | } else if (!is_fd_closed) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 397 | close(fd->fd); |
| 398 | is_fd_closed = true; |
| 399 | } |
| 400 | |
| 401 | fd->orphaned = true; |
| 402 | |
Craig Tiller | f4360d7 | 2017-04-07 08:51:00 -0700 | [diff] [blame] | 403 | if (!is_fd_closed) { |
| 404 | gpr_log(GPR_DEBUG, "TODO: handle fd removal?"); |
| 405 | } |
| 406 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 407 | /* Remove the active status but keep referenced. We want this grpc_fd struct |
| 408 | to be alive (and not added to freelist) until the end of this function */ |
| 409 | REF_BY(fd, 1, reason); |
| 410 | |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 411 | GRPC_CLOSURE_SCHED(exec_ctx, fd->on_done_closure, GRPC_ERROR_REF(error)); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 412 | |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 413 | gpr_mu_unlock(&fd->orphaned_mu); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 414 | gpr_mu_unlock(&fd->pollable_obj.po.mu); |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 415 | UNREF_BY(exec_ctx, fd, 2, reason); /* Drop the reference */ |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 416 | GRPC_LOG_IF_ERROR("fd_orphan", GRPC_ERROR_REF(error)); |
| 417 | GRPC_ERROR_UNREF(error); |
| 418 | } |
| 419 | |
| 420 | static grpc_pollset *fd_get_read_notifier_pollset(grpc_exec_ctx *exec_ctx, |
| 421 | grpc_fd *fd) { |
| 422 | gpr_atm notifier = gpr_atm_acq_load(&fd->read_notifier_pollset); |
| 423 | return (grpc_pollset *)notifier; |
| 424 | } |
| 425 | |
| 426 | static bool fd_is_shutdown(grpc_fd *fd) { |
| 427 | return grpc_lfev_is_shutdown(&fd->read_closure); |
| 428 | } |
| 429 | |
| 430 | /* Might be called multiple times */ |
| 431 | static void fd_shutdown(grpc_exec_ctx *exec_ctx, grpc_fd *fd, grpc_error *why) { |
| 432 | if (grpc_lfev_set_shutdown(exec_ctx, &fd->read_closure, |
| 433 | GRPC_ERROR_REF(why))) { |
| 434 | shutdown(fd->fd, SHUT_RDWR); |
| 435 | grpc_lfev_set_shutdown(exec_ctx, &fd->write_closure, GRPC_ERROR_REF(why)); |
| 436 | } |
| 437 | GRPC_ERROR_UNREF(why); |
| 438 | } |
| 439 | |
| 440 | static void fd_notify_on_read(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 441 | grpc_closure *closure) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 442 | grpc_lfev_notify_on(exec_ctx, &fd->read_closure, closure, "read"); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | static void fd_notify_on_write(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 446 | grpc_closure *closure) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 447 | grpc_lfev_notify_on(exec_ctx, &fd->write_closure, closure, "write"); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 448 | } |
| 449 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 450 | /******************************************************************************* |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 451 | * Pollable Definitions |
| 452 | */ |
| 453 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 454 | static void pollable_init(pollable *p, polling_obj_type type) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 455 | po_init(&p->po, type); |
| 456 | p->root_worker = NULL; |
| 457 | p->epfd = -1; |
| 458 | } |
| 459 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 460 | static void pollable_destroy(pollable *p) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 461 | po_destroy(&p->po); |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 462 | if (p->epfd != -1) { |
| 463 | close(p->epfd); |
| 464 | grpc_wakeup_fd_destroy(&p->wakeup); |
| 465 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 466 | } |
| 467 | |
| 468 | /* ensure that p->epfd, p->wakeup are initialized; p->po.mu must be held */ |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 469 | static grpc_error *pollable_materialize(pollable *p) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 470 | if (p->epfd == -1) { |
| 471 | int new_epfd = epoll_create1(EPOLL_CLOEXEC); |
| 472 | if (new_epfd < 0) { |
| 473 | return GRPC_OS_ERROR(errno, "epoll_create1"); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 474 | } |
| 475 | grpc_error *err = grpc_wakeup_fd_init(&p->wakeup); |
| 476 | if (err != GRPC_ERROR_NONE) { |
| 477 | close(new_epfd); |
| 478 | return err; |
| 479 | } |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame^] | 480 | struct epoll_event ev; |
| 481 | ev.events = (uint32_t)(EPOLLIN | EPOLLET); |
| 482 | ev.data.ptr = (void *)(1 | (intptr_t)&p->wakeup); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 483 | if (epoll_ctl(new_epfd, EPOLL_CTL_ADD, p->wakeup.read_fd, &ev) != 0) { |
| 484 | err = GRPC_OS_ERROR(errno, "epoll_ctl"); |
| 485 | close(new_epfd); |
| 486 | grpc_wakeup_fd_destroy(&p->wakeup); |
| 487 | return err; |
| 488 | } |
| 489 | |
| 490 | p->epfd = new_epfd; |
| 491 | } |
| 492 | return GRPC_ERROR_NONE; |
| 493 | } |
| 494 | |
| 495 | /* pollable must be materialized */ |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 496 | static grpc_error *pollable_add_fd(pollable *p, grpc_fd *fd) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 497 | grpc_error *error = GRPC_ERROR_NONE; |
| 498 | static const char *err_desc = "pollable_add_fd"; |
| 499 | const int epfd = p->epfd; |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 500 | GPR_ASSERT(epfd != -1); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 501 | |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 502 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 503 | 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] | 504 | } |
| 505 | |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 506 | gpr_mu_lock(&fd->orphaned_mu); |
| 507 | if (fd->orphaned) { |
| 508 | gpr_mu_unlock(&fd->orphaned_mu); |
| 509 | return GRPC_ERROR_NONE; |
| 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 | } |
Craig Tiller | 79d24fb | 2017-04-17 19:35:19 +0000 | [diff] [blame] | 522 | gpr_mu_unlock(&fd->orphaned_mu); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 523 | |
| 524 | return error; |
| 525 | } |
| 526 | |
| 527 | /******************************************************************************* |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 528 | * Pollset Definitions |
| 529 | */ |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 530 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 531 | GPR_TLS_DECL(g_current_thread_pollset); |
| 532 | GPR_TLS_DECL(g_current_thread_worker); |
| 533 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 534 | /* Global state management */ |
| 535 | static grpc_error *pollset_global_init(void) { |
| 536 | gpr_tls_init(&g_current_thread_pollset); |
| 537 | gpr_tls_init(&g_current_thread_worker); |
Craig Tiller | 911490c | 2017-04-14 16:19:57 -0700 | [diff] [blame] | 538 | pollable_init(&g_empty_pollable, PO_EMPTY_POLLABLE); |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 539 | return GRPC_ERROR_NONE; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 540 | } |
| 541 | |
| 542 | static void pollset_global_shutdown(void) { |
Craig Tiller | 911490c | 2017-04-14 16:19:57 -0700 | [diff] [blame] | 543 | pollable_destroy(&g_empty_pollable); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 544 | gpr_tls_destroy(&g_current_thread_pollset); |
| 545 | gpr_tls_destroy(&g_current_thread_worker); |
| 546 | } |
| 547 | |
Craig Tiller | e16722c | 2017-05-17 21:50:37 +0000 | [diff] [blame] | 548 | static void pollset_maybe_finish_shutdown(grpc_exec_ctx *exec_ctx, |
| 549 | grpc_pollset *pollset) { |
Craig Tiller | f7e0748 | 2017-05-18 10:13:53 -0700 | [diff] [blame] | 550 | if (pollset->shutdown_closure != NULL && pollset->root_worker == NULL && |
| 551 | pollset->kick_alls_pending == 0) { |
Craig Tiller | ca669b0 | 2017-06-09 12:41:51 -0700 | [diff] [blame] | 552 | GRPC_CLOSURE_SCHED(exec_ctx, pollset->shutdown_closure, GRPC_ERROR_NONE); |
Craig Tiller | e16722c | 2017-05-17 21:50:37 +0000 | [diff] [blame] | 553 | pollset->shutdown_closure = NULL; |
| 554 | } |
| 555 | } |
| 556 | |
Craig Tiller | f7e0748 | 2017-05-18 10:13:53 -0700 | [diff] [blame] | 557 | static void do_kick_all(grpc_exec_ctx *exec_ctx, void *arg, |
| 558 | grpc_error *error_unused) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 559 | grpc_error *error = GRPC_ERROR_NONE; |
Yash Tibrewal | ca3c1c0 | 2017-09-07 22:47:16 -0700 | [diff] [blame] | 560 | grpc_pollset *pollset = (grpc_pollset *)arg; |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 561 | gpr_mu_lock(&pollset->pollable_obj.po.mu); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 562 | if (pollset->root_worker != NULL) { |
| 563 | grpc_pollset_worker *worker = pollset->root_worker; |
| 564 | do { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 565 | if (worker->pollable_obj != &pollset->pollable_obj) { |
| 566 | gpr_mu_lock(&worker->pollable_obj->po.mu); |
Craig Tiller | c8d9b9c | 2017-04-21 16:41:34 +0000 | [diff] [blame] | 567 | } |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 568 | if (worker->initialized_cv && worker != pollset->root_worker) { |
| 569 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 7fd8f67 | 2017-07-05 15:10:12 -0700 | [diff] [blame] | 570 | gpr_log(GPR_DEBUG, "PS:%p kickall_via_cv %p (pollable %p vs %p)", |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 571 | pollset, worker, &pollset->pollable_obj, |
| 572 | worker->pollable_obj); |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 573 | } |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 574 | worker->kicked = true; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 575 | gpr_cv_signal(&worker->cv); |
| 576 | } else { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 577 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 7fd8f67 | 2017-07-05 15:10:12 -0700 | [diff] [blame] | 578 | gpr_log(GPR_DEBUG, "PS:%p kickall_via_wakeup %p (pollable %p vs %p)", |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 579 | pollset, worker, &pollset->pollable_obj, |
| 580 | worker->pollable_obj); |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 581 | } |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 582 | append_error(&error, |
| 583 | grpc_wakeup_fd_wakeup(&worker->pollable_obj->wakeup), |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 584 | "pollset_shutdown"); |
| 585 | } |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 586 | if (worker->pollable_obj != &pollset->pollable_obj) { |
| 587 | gpr_mu_unlock(&worker->pollable_obj->po.mu); |
Craig Tiller | c8d9b9c | 2017-04-21 16:41:34 +0000 | [diff] [blame] | 588 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 589 | |
| 590 | worker = worker->links[PWL_POLLSET].next; |
| 591 | } while (worker != pollset->root_worker); |
| 592 | } |
Craig Tiller | f7e0748 | 2017-05-18 10:13:53 -0700 | [diff] [blame] | 593 | pollset->kick_alls_pending--; |
| 594 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 595 | gpr_mu_unlock(&pollset->pollable_obj.po.mu); |
Craig Tiller | e16722c | 2017-05-17 21:50:37 +0000 | [diff] [blame] | 596 | GRPC_LOG_IF_ERROR("kick_all", error); |
| 597 | } |
| 598 | |
| 599 | static void pollset_kick_all(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset) { |
Craig Tiller | f7e0748 | 2017-05-18 10:13:53 -0700 | [diff] [blame] | 600 | pollset->kick_alls_pending++; |
Craig Tiller | ca669b0 | 2017-06-09 12:41:51 -0700 | [diff] [blame] | 601 | GRPC_CLOSURE_SCHED(exec_ctx, GRPC_CLOSURE_CREATE(do_kick_all, pollset, |
Craig Tiller | f7e0748 | 2017-05-18 10:13:53 -0700 | [diff] [blame] | 602 | grpc_schedule_on_exec_ctx), |
| 603 | GRPC_ERROR_NONE); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 604 | } |
| 605 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 606 | static grpc_error *pollset_kick_inner(grpc_pollset *pollset, pollable *p, |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 607 | grpc_pollset_worker *specific_worker) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 608 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 609 | gpr_log(GPR_DEBUG, |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 610 | "PS:%p kick %p tls_pollset=%p tls_worker=%p " |
| 611 | "root_worker=(pollset:%p pollable:%p)", |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 612 | p, specific_worker, (void *)gpr_tls_get(&g_current_thread_pollset), |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 613 | (void *)gpr_tls_get(&g_current_thread_worker), pollset->root_worker, |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 614 | p->root_worker); |
| 615 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 616 | if (specific_worker == NULL) { |
Craig Tiller | b72a74a | 2017-04-27 12:07:05 -0700 | [diff] [blame] | 617 | if (gpr_tls_get(&g_current_thread_pollset) != (intptr_t)pollset) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 618 | if (pollset->root_worker == NULL) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 619 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 620 | gpr_log(GPR_DEBUG, "PS:%p kicked_any_without_poller", p); |
Craig Tiller | 1ad9477 | 2017-04-11 16:15:19 +0000 | [diff] [blame] | 621 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 622 | pollset->kicked_without_poller = true; |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 623 | return GRPC_ERROR_NONE; |
| 624 | } else { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 625 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 626 | gpr_log(GPR_DEBUG, "PS:%p kicked_any_via_wakeup_fd", p); |
Craig Tiller | 1ad9477 | 2017-04-11 16:15:19 +0000 | [diff] [blame] | 627 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 628 | grpc_error *err = pollable_materialize(p); |
| 629 | if (err != GRPC_ERROR_NONE) return err; |
| 630 | return grpc_wakeup_fd_wakeup(&p->wakeup); |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 631 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 632 | } else { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 633 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 634 | gpr_log(GPR_DEBUG, "PS:%p kicked_any_but_awake", p); |
Craig Tiller | 1ad9477 | 2017-04-11 16:15:19 +0000 | [diff] [blame] | 635 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 636 | return GRPC_ERROR_NONE; |
| 637 | } |
Craig Tiller | d37d142 | 2017-04-18 19:41:07 +0000 | [diff] [blame] | 638 | } else if (specific_worker->kicked) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 639 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | d37d142 | 2017-04-18 19:41:07 +0000 | [diff] [blame] | 640 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_but_already_kicked", p); |
| 641 | } |
| 642 | return GRPC_ERROR_NONE; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 643 | } else if (gpr_tls_get(&g_current_thread_worker) == |
| 644 | (intptr_t)specific_worker) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 645 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 646 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_but_awake", p); |
Craig Tiller | 1ad9477 | 2017-04-11 16:15:19 +0000 | [diff] [blame] | 647 | } |
Craig Tiller | d37d142 | 2017-04-18 19:41:07 +0000 | [diff] [blame] | 648 | specific_worker->kicked = true; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 649 | return GRPC_ERROR_NONE; |
| 650 | } else if (specific_worker == p->root_worker) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 651 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 652 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_via_wakeup_fd", p); |
Craig Tiller | 1ad9477 | 2017-04-11 16:15:19 +0000 | [diff] [blame] | 653 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 654 | grpc_error *err = pollable_materialize(p); |
| 655 | if (err != GRPC_ERROR_NONE) return err; |
Craig Tiller | d37d142 | 2017-04-18 19:41:07 +0000 | [diff] [blame] | 656 | specific_worker->kicked = true; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 657 | return grpc_wakeup_fd_wakeup(&p->wakeup); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 658 | } else { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 659 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 660 | gpr_log(GPR_DEBUG, "PS:%p kicked_specific_via_cv", p); |
Craig Tiller | 1ad9477 | 2017-04-11 16:15:19 +0000 | [diff] [blame] | 661 | } |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 662 | specific_worker->kicked = true; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 663 | gpr_cv_signal(&specific_worker->cv); |
| 664 | return GRPC_ERROR_NONE; |
| 665 | } |
Craig Tiller | 26017de | 2017-04-15 00:07:25 +0000 | [diff] [blame] | 666 | } |
| 667 | |
| 668 | /* p->po.mu must be held before calling this function */ |
| 669 | static grpc_error *pollset_kick(grpc_pollset *pollset, |
| 670 | grpc_pollset_worker *specific_worker) { |
Yash Tibrewal | 8f798e9 | 2017-09-13 15:45:47 -0700 | [diff] [blame] | 671 | pollable *p = pollset->current_pollable_obj; |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 672 | if (p != &pollset->pollable_obj) { |
Craig Tiller | 26017de | 2017-04-15 00:07:25 +0000 | [diff] [blame] | 673 | gpr_mu_lock(&p->po.mu); |
| 674 | } |
| 675 | grpc_error *error = pollset_kick_inner(pollset, p, specific_worker); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 676 | if (p != &pollset->pollable_obj) { |
Craig Tiller | 26017de | 2017-04-15 00:07:25 +0000 | [diff] [blame] | 677 | gpr_mu_unlock(&p->po.mu); |
| 678 | } |
| 679 | return error; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 680 | } |
| 681 | |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 682 | static void pollset_init(grpc_pollset *pollset, gpr_mu **mu) { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 683 | pollable_init(&pollset->pollable_obj, PO_POLLSET); |
Yash Tibrewal | 8f798e9 | 2017-09-13 15:45:47 -0700 | [diff] [blame] | 684 | pollset->current_pollable_obj = &g_empty_pollable; |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 685 | pollset->kicked_without_poller = false; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 686 | pollset->shutdown_closure = NULL; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 687 | pollset->root_worker = NULL; |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 688 | *mu = &pollset->pollable_obj.po.mu; |
Craig Tiller | 9f01251 | 2017-04-13 15:37:14 -0700 | [diff] [blame] | 689 | } |
| 690 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 691 | /* Convert a timespec to milliseconds: |
| 692 | - Very small or negative poll times are clamped to zero to do a non-blocking |
| 693 | poll (which becomes spin polling) |
| 694 | - Other small values are rounded up to one millisecond |
| 695 | - Longer than a millisecond polls are rounded up to the next nearest |
| 696 | millisecond to avoid spinning |
| 697 | - Infinite timeouts are converted to -1 */ |
| 698 | static int poll_deadline_to_millis_timeout(gpr_timespec deadline, |
| 699 | gpr_timespec now) { |
| 700 | gpr_timespec timeout; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 701 | if (gpr_time_cmp(deadline, gpr_inf_future(deadline.clock_type)) == 0) { |
| 702 | return -1; |
| 703 | } |
| 704 | |
Craig Tiller | 7f5fac9 | 2017-04-07 21:47:41 +0000 | [diff] [blame] | 705 | if (gpr_time_cmp(deadline, now) <= 0) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 706 | return 0; |
| 707 | } |
Craig Tiller | 7f5fac9 | 2017-04-07 21:47:41 +0000 | [diff] [blame] | 708 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame^] | 709 | static const gpr_timespec round_up = {0, GPR_NS_PER_MS - 1, GPR_TIMESPAN}; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 710 | timeout = gpr_time_sub(deadline, now); |
Craig Tiller | 7f5fac9 | 2017-04-07 21:47:41 +0000 | [diff] [blame] | 711 | int millis = gpr_time_to_millis(gpr_time_add(timeout, round_up)); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 712 | return millis >= 1 ? millis : 1; |
| 713 | } |
| 714 | |
| 715 | static void fd_become_readable(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| 716 | grpc_pollset *notifier) { |
Craig Tiller | 830e82a | 2017-05-31 16:26:27 -0700 | [diff] [blame] | 717 | grpc_lfev_set_ready(exec_ctx, &fd->read_closure, "read"); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 718 | |
| 719 | /* Note, it is possible that fd_become_readable might be called twice with |
| 720 | different 'notifier's when an fd becomes readable and it is in two epoll |
| 721 | sets (This can happen briefly during polling island merges). In such cases |
| 722 | it does not really matter which notifer is set as the read_notifier_pollset |
| 723 | (They would both point to the same polling island anyway) */ |
| 724 | /* Use release store to match with acquire load in fd_get_read_notifier */ |
| 725 | gpr_atm_rel_store(&fd->read_notifier_pollset, (gpr_atm)notifier); |
| 726 | } |
| 727 | |
| 728 | 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] | 729 | grpc_lfev_set_ready(exec_ctx, &fd->write_closure, "write"); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 730 | } |
| 731 | |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 732 | static grpc_error *fd_become_pollable_locked(grpc_fd *fd) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 733 | grpc_error *error = GRPC_ERROR_NONE; |
| 734 | static const char *err_desc = "fd_become_pollable"; |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 735 | if (append_error(&error, pollable_materialize(&fd->pollable_obj), err_desc)) { |
| 736 | append_error(&error, pollable_add_fd(&fd->pollable_obj, fd), err_desc); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 737 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 738 | return error; |
| 739 | } |
| 740 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 741 | /* pollset->po.mu lock must be held by the caller before calling this */ |
| 742 | static void pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 743 | grpc_closure *closure) { |
| 744 | GPR_ASSERT(pollset->shutdown_closure == NULL); |
| 745 | pollset->shutdown_closure = closure; |
Craig Tiller | e16722c | 2017-05-17 21:50:37 +0000 | [diff] [blame] | 746 | pollset_kick_all(exec_ctx, pollset); |
Craig Tiller | d9cd8f0 | 2017-04-07 16:26:02 -0700 | [diff] [blame] | 747 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 748 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 749 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 750 | static bool pollset_is_pollable_fd(grpc_pollset *pollset, pollable *p) { |
| 751 | return p != &g_empty_pollable && p != &pollset->pollable_obj; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 752 | } |
| 753 | |
Craig Tiller | 9bedddd | 2017-06-08 17:05:00 -0700 | [diff] [blame] | 754 | static grpc_error *pollset_process_events(grpc_exec_ctx *exec_ctx, |
| 755 | grpc_pollset *pollset, bool drain) { |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 756 | static const char *err_desc = "pollset_process_events"; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 757 | grpc_error *error = GRPC_ERROR_NONE; |
Craig Tiller | ca4fc66 | 2017-06-09 11:13:56 -0700 | [diff] [blame] | 758 | for (int i = 0; (drain || i < MAX_EPOLL_EVENTS_HANDLED_EACH_POLL_CALL) && |
| 759 | pollset->event_cursor != pollset->event_count; |
| 760 | i++) { |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 761 | int n = pollset->event_cursor++; |
| 762 | struct epoll_event *ev = &pollset->events[n]; |
| 763 | void *data_ptr = ev->data.ptr; |
| 764 | if (1 & (intptr_t)data_ptr) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 765 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 766 | 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] | 767 | } |
Yash Tibrewal | 52778c4 | 2017-09-11 15:00:11 -0700 | [diff] [blame] | 768 | append_error(&error, |
| 769 | grpc_wakeup_fd_consume_wakeup( |
| 770 | (grpc_wakeup_fd *)((~(intptr_t)1) & (intptr_t)data_ptr)), |
Craig Tiller | 9bedddd | 2017-06-08 17:05:00 -0700 | [diff] [blame] | 771 | err_desc); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 772 | } else { |
Craig Tiller | 61f96c1 | 2017-05-12 13:36:39 -0700 | [diff] [blame] | 773 | grpc_fd *fd = (grpc_fd *)data_ptr; |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 774 | bool cancel = (ev->events & (EPOLLERR | EPOLLHUP)) != 0; |
| 775 | bool read_ev = (ev->events & (EPOLLIN | EPOLLPRI)) != 0; |
| 776 | bool write_ev = (ev->events & EPOLLOUT) != 0; |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 777 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 778 | gpr_log(GPR_DEBUG, |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 779 | "PS:%p got fd %p: cancel=%d read=%d " |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 780 | "write=%d", |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 781 | pollset, fd, cancel, read_ev, write_ev); |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 782 | } |
Craig Tiller | 61f96c1 | 2017-05-12 13:36:39 -0700 | [diff] [blame] | 783 | if (read_ev || cancel) { |
| 784 | fd_become_readable(exec_ctx, fd, pollset); |
| 785 | } |
| 786 | if (write_ev || cancel) { |
| 787 | fd_become_writable(exec_ctx, fd); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 788 | } |
| 789 | } |
| 790 | } |
| 791 | |
| 792 | return error; |
| 793 | } |
| 794 | |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 795 | /* pollset_shutdown is guaranteed to be called before pollset_destroy. */ |
| 796 | static void pollset_destroy(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset) { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 797 | pollable_destroy(&pollset->pollable_obj); |
Yash Tibrewal | 8f798e9 | 2017-09-13 15:45:47 -0700 | [diff] [blame] | 798 | if (pollset_is_pollable_fd(pollset, pollset->current_pollable_obj)) { |
| 799 | UNREF_BY(exec_ctx, (grpc_fd *)pollset->current_pollable_obj, 2, |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 800 | "pollset_pollable"); |
| 801 | } |
Craig Tiller | 9bedddd | 2017-06-08 17:05:00 -0700 | [diff] [blame] | 802 | GRPC_LOG_IF_ERROR("pollset_process_events", |
| 803 | pollset_process_events(exec_ctx, pollset, true)); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 804 | } |
| 805 | |
| 806 | static grpc_error *pollset_epoll(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 807 | pollable *p, gpr_timespec now, |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 808 | gpr_timespec deadline) { |
| 809 | int timeout = poll_deadline_to_millis_timeout(deadline, now); |
| 810 | |
| 811 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 812 | char *desc = pollable_desc(p); |
| 813 | gpr_log(GPR_DEBUG, "PS:%p poll %p[%s] for %dms", pollset, p, desc, timeout); |
| 814 | gpr_free(desc); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 815 | } |
| 816 | |
| 817 | if (timeout != 0) { |
| 818 | GRPC_SCHEDULING_START_BLOCKING_REGION; |
| 819 | } |
| 820 | int r; |
| 821 | do { |
Craig Tiller | b4bb1cd | 2017-07-20 14:18:17 -0700 | [diff] [blame] | 822 | GRPC_STATS_INC_SYSCALL_POLL(exec_ctx); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 823 | r = epoll_wait(p->epfd, pollset->events, MAX_EPOLL_EVENTS, timeout); |
| 824 | } while (r < 0 && errno == EINTR); |
| 825 | if (timeout != 0) { |
| 826 | GRPC_SCHEDULING_END_BLOCKING_REGION; |
| 827 | } |
| 828 | |
| 829 | if (r < 0) return GRPC_OS_ERROR(errno, "epoll_wait"); |
| 830 | |
| 831 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
| 832 | gpr_log(GPR_DEBUG, "PS:%p poll %p got %d events", pollset, p, r); |
| 833 | } |
| 834 | |
| 835 | pollset->event_cursor = 0; |
| 836 | pollset->event_count = r; |
| 837 | |
| 838 | return GRPC_ERROR_NONE; |
| 839 | } |
| 840 | |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 841 | /* Return true if first in list */ |
| 842 | static bool worker_insert(grpc_pollset_worker **root, pollset_worker_links link, |
| 843 | grpc_pollset_worker *worker) { |
| 844 | if (*root == NULL) { |
| 845 | *root = worker; |
| 846 | worker->links[link].next = worker->links[link].prev = worker; |
| 847 | return true; |
| 848 | } else { |
| 849 | worker->links[link].next = *root; |
| 850 | worker->links[link].prev = worker->links[link].next->links[link].prev; |
| 851 | worker->links[link].next->links[link].prev = worker; |
| 852 | worker->links[link].prev->links[link].next = worker; |
| 853 | return false; |
| 854 | } |
| 855 | } |
| 856 | |
| 857 | /* Return true if last in list */ |
| 858 | typedef enum { EMPTIED, NEW_ROOT, REMOVED } worker_remove_result; |
| 859 | |
| 860 | static worker_remove_result worker_remove(grpc_pollset_worker **root, |
| 861 | pollset_worker_links link, |
| 862 | grpc_pollset_worker *worker) { |
| 863 | if (worker == *root) { |
| 864 | if (worker == worker->links[link].next) { |
| 865 | *root = NULL; |
| 866 | return EMPTIED; |
| 867 | } else { |
| 868 | *root = worker->links[link].next; |
| 869 | worker->links[link].prev->links[link].next = worker->links[link].next; |
| 870 | worker->links[link].next->links[link].prev = worker->links[link].prev; |
| 871 | return NEW_ROOT; |
| 872 | } |
| 873 | } else { |
| 874 | worker->links[link].prev->links[link].next = worker->links[link].next; |
| 875 | worker->links[link].next->links[link].prev = worker->links[link].prev; |
| 876 | return REMOVED; |
| 877 | } |
| 878 | } |
| 879 | |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 880 | /* Return true if this thread should poll */ |
| 881 | static bool begin_worker(grpc_pollset *pollset, grpc_pollset_worker *worker, |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 882 | grpc_pollset_worker **worker_hdl, gpr_timespec *now, |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 883 | gpr_timespec deadline) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 884 | bool do_poll = true; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 885 | if (worker_hdl != NULL) *worker_hdl = worker; |
Craig Tiller | 9f01251 | 2017-04-13 15:37:14 -0700 | [diff] [blame] | 886 | worker->initialized_cv = false; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 887 | worker->kicked = false; |
| 888 | worker->pollset = pollset; |
Yash Tibrewal | 8f798e9 | 2017-09-13 15:45:47 -0700 | [diff] [blame] | 889 | worker->pollable_obj = pollset->current_pollable_obj; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 890 | |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 891 | if (pollset_is_pollable_fd(pollset, worker->pollable_obj)) { |
| 892 | REF_BY((grpc_fd *)worker->pollable_obj, 2, "one_poll"); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 893 | } |
| 894 | |
| 895 | worker_insert(&pollset->root_worker, PWL_POLLSET, worker); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 896 | if (!worker_insert(&worker->pollable_obj->root_worker, PWL_POLLABLE, |
| 897 | worker)) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 898 | worker->initialized_cv = true; |
| 899 | gpr_cv_init(&worker->cv); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 900 | if (worker->pollable_obj != &pollset->pollable_obj) { |
| 901 | gpr_mu_unlock(&pollset->pollable_obj.po.mu); |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 902 | } |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 903 | if (GRPC_TRACER_ON(grpc_polling_trace) && |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 904 | worker->pollable_obj->root_worker != worker) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 905 | 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] | 906 | worker->pollable_obj, worker, |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 907 | poll_deadline_to_millis_timeout(deadline, *now)); |
| 908 | } |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 909 | while (do_poll && worker->pollable_obj->root_worker != worker) { |
| 910 | if (gpr_cv_wait(&worker->cv, &worker->pollable_obj->po.mu, deadline)) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 911 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 912 | gpr_log(GPR_DEBUG, "PS:%p timeout_wait %p w=%p", pollset, |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 913 | worker->pollable_obj, worker); |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 914 | } |
| 915 | do_poll = false; |
| 916 | } else if (worker->kicked) { |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 917 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 918 | gpr_log(GPR_DEBUG, "PS:%p wakeup %p w=%p", pollset, |
| 919 | worker->pollable_obj, worker); |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 920 | } |
| 921 | do_poll = false; |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 922 | } else if (GRPC_TRACER_ON(grpc_polling_trace) && |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 923 | worker->pollable_obj->root_worker != worker) { |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 924 | gpr_log(GPR_DEBUG, "PS:%p spurious_wakeup %p w=%p", pollset, |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 925 | worker->pollable_obj, worker); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 926 | } |
| 927 | } |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 928 | if (worker->pollable_obj != &pollset->pollable_obj) { |
| 929 | gpr_mu_unlock(&worker->pollable_obj->po.mu); |
| 930 | gpr_mu_lock(&pollset->pollable_obj.po.mu); |
| 931 | gpr_mu_lock(&worker->pollable_obj->po.mu); |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 932 | } |
| 933 | *now = gpr_now(now->clock_type); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 934 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 935 | |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 936 | return do_poll && pollset->shutdown_closure == NULL && |
Yash Tibrewal | 8f798e9 | 2017-09-13 15:45:47 -0700 | [diff] [blame] | 937 | pollset->current_pollable_obj == worker->pollable_obj; |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 938 | } |
| 939 | |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 940 | static void end_worker(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 941 | grpc_pollset_worker *worker, |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 942 | grpc_pollset_worker **worker_hdl) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 943 | if (NEW_ROOT == |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 944 | worker_remove(&worker->pollable_obj->root_worker, PWL_POLLABLE, worker)) { |
| 945 | gpr_cv_signal(&worker->pollable_obj->root_worker->cv); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 946 | } |
| 947 | if (worker->initialized_cv) { |
| 948 | gpr_cv_destroy(&worker->cv); |
| 949 | } |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 950 | if (pollset_is_pollable_fd(pollset, worker->pollable_obj)) { |
| 951 | UNREF_BY(exec_ctx, (grpc_fd *)worker->pollable_obj, 2, "one_poll"); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 952 | } |
Craig Tiller | 227e11b | 2017-04-20 18:25:02 +0000 | [diff] [blame] | 953 | if (EMPTIED == worker_remove(&pollset->root_worker, PWL_POLLSET, worker)) { |
| 954 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
| 955 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 956 | } |
| 957 | |
Craig Tiller | 8fc1ca1 | 2017-04-07 13:01:48 -0700 | [diff] [blame] | 958 | /* pollset->po.mu lock must be held by the caller before calling this. |
| 959 | The function pollset_work() may temporarily release the lock (pollset->po.mu) |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 960 | during the course of its execution but it will always re-acquire the lock and |
| 961 | ensure that it is held by the time the function returns */ |
| 962 | static grpc_error *pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 963 | grpc_pollset_worker **worker_hdl, |
| 964 | gpr_timespec now, gpr_timespec deadline) { |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 965 | grpc_pollset_worker worker; |
Craig Tiller | cfaa046 | 2017-05-05 15:27:40 +0000 | [diff] [blame] | 966 | if (0 && GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | cd0354b | 2017-04-10 16:19:18 -0700 | [diff] [blame] | 967 | gpr_log(GPR_DEBUG, "PS:%p work hdl=%p worker=%p now=%" PRId64 |
| 968 | ".%09d deadline=%" PRId64 ".%09d kwp=%d root_worker=%p", |
| 969 | pollset, worker_hdl, &worker, now.tv_sec, now.tv_nsec, |
| 970 | deadline.tv_sec, deadline.tv_nsec, pollset->kicked_without_poller, |
| 971 | pollset->root_worker); |
| 972 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 973 | grpc_error *error = GRPC_ERROR_NONE; |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 974 | static const char *err_desc = "pollset_work"; |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 975 | if (pollset->kicked_without_poller) { |
| 976 | pollset->kicked_without_poller = false; |
| 977 | return GRPC_ERROR_NONE; |
| 978 | } |
Yash Tibrewal | 8f798e9 | 2017-09-13 15:45:47 -0700 | [diff] [blame] | 979 | if (pollset->current_pollable_obj != &pollset->pollable_obj) { |
| 980 | gpr_mu_lock(&pollset->current_pollable_obj->po.mu); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 981 | } |
Craig Tiller | e3a6933 | 2017-04-18 16:45:40 +0000 | [diff] [blame] | 982 | if (begin_worker(pollset, &worker, worker_hdl, &now, deadline)) { |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 983 | gpr_tls_set(&g_current_thread_pollset, (intptr_t)pollset); |
| 984 | gpr_tls_set(&g_current_thread_worker, (intptr_t)&worker); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 985 | GPR_ASSERT(!pollset->shutdown_closure); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 986 | append_error(&error, pollable_materialize(worker.pollable_obj), err_desc); |
| 987 | if (worker.pollable_obj != &pollset->pollable_obj) { |
| 988 | gpr_mu_unlock(&worker.pollable_obj->po.mu); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 989 | } |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 990 | gpr_mu_unlock(&pollset->pollable_obj.po.mu); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 991 | if (pollset->event_cursor == pollset->event_count) { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 992 | append_error(&error, pollset_epoll(exec_ctx, pollset, worker.pollable_obj, |
Craig Tiller | 9bedddd | 2017-06-08 17:05:00 -0700 | [diff] [blame] | 993 | now, deadline), |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 994 | err_desc); |
| 995 | } |
Craig Tiller | 9bedddd | 2017-06-08 17:05:00 -0700 | [diff] [blame] | 996 | append_error(&error, pollset_process_events(exec_ctx, pollset, false), |
| 997 | err_desc); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 998 | gpr_mu_lock(&pollset->pollable_obj.po.mu); |
| 999 | if (worker.pollable_obj != &pollset->pollable_obj) { |
| 1000 | gpr_mu_lock(&worker.pollable_obj->po.mu); |
Craig Tiller | 9f01251 | 2017-04-13 15:37:14 -0700 | [diff] [blame] | 1001 | } |
Craig Tiller | bb93af6 | 2017-04-07 23:49:00 +0000 | [diff] [blame] | 1002 | gpr_tls_set(&g_current_thread_pollset, 0); |
| 1003 | gpr_tls_set(&g_current_thread_worker, 0); |
Craig Tiller | d9cd8f0 | 2017-04-07 16:26:02 -0700 | [diff] [blame] | 1004 | pollset_maybe_finish_shutdown(exec_ctx, pollset); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 1005 | } |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 1006 | end_worker(exec_ctx, pollset, &worker, worker_hdl); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1007 | if (worker.pollable_obj != &pollset->pollable_obj) { |
| 1008 | gpr_mu_unlock(&worker.pollable_obj->po.mu); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 1009 | } |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 1010 | if (grpc_exec_ctx_has_work(exec_ctx)) { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1011 | gpr_mu_unlock(&pollset->pollable_obj.po.mu); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 1012 | grpc_exec_ctx_flush(exec_ctx); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1013 | gpr_mu_lock(&pollset->pollable_obj.po.mu); |
Craig Tiller | 4f07ea8 | 2017-06-08 23:56:06 +0000 | [diff] [blame] | 1014 | } |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 1015 | return error; |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1016 | } |
| 1017 | |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 1018 | static void unref_fd_no_longer_poller(grpc_exec_ctx *exec_ctx, void *arg, |
| 1019 | grpc_error *error) { |
Yash Tibrewal | ca3c1c0 | 2017-09-07 22:47:16 -0700 | [diff] [blame] | 1020 | grpc_fd *fd = (grpc_fd *)arg; |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1021 | UNREF_BY(exec_ctx, fd, 2, "pollset_pollable"); |
| 1022 | } |
| 1023 | |
| 1024 | /* expects pollsets locked, flag whether fd is locked or not */ |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 1025 | static grpc_error *pollset_add_fd_locked(grpc_exec_ctx *exec_ctx, |
| 1026 | grpc_pollset *pollset, grpc_fd *fd, |
| 1027 | bool fd_locked) { |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 1028 | static const char *err_desc = "pollset_add_fd"; |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1029 | grpc_error *error = GRPC_ERROR_NONE; |
Yash Tibrewal | 8f798e9 | 2017-09-13 15:45:47 -0700 | [diff] [blame] | 1030 | if (pollset->current_pollable_obj == &g_empty_pollable) { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 1031 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 1032 | gpr_log(GPR_DEBUG, |
| 1033 | "PS:%p add fd %p; transition pollable from empty to fd", pollset, |
| 1034 | fd); |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 1035 | } |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1036 | /* empty pollable --> single fd pollable */ |
Craig Tiller | e16722c | 2017-05-17 21:50:37 +0000 | [diff] [blame] | 1037 | pollset_kick_all(exec_ctx, pollset); |
Yash Tibrewal | 8f798e9 | 2017-09-13 15:45:47 -0700 | [diff] [blame] | 1038 | pollset->current_pollable_obj = &fd->pollable_obj; |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1039 | if (!fd_locked) gpr_mu_lock(&fd->pollable_obj.po.mu); |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1040 | append_error(&error, fd_become_pollable_locked(fd), err_desc); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1041 | if (!fd_locked) gpr_mu_unlock(&fd->pollable_obj.po.mu); |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 1042 | REF_BY(fd, 2, "pollset_pollable"); |
Yash Tibrewal | 8f798e9 | 2017-09-13 15:45:47 -0700 | [diff] [blame] | 1043 | } else if (pollset->current_pollable_obj == &pollset->pollable_obj) { |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 1044 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 1045 | gpr_log(GPR_DEBUG, "PS:%p add fd %p; already multipolling", pollset, fd); |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 1046 | } |
Yash Tibrewal | 8f798e9 | 2017-09-13 15:45:47 -0700 | [diff] [blame] | 1047 | append_error(&error, pollable_add_fd(pollset->current_pollable_obj, fd), |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 1048 | err_desc); |
Yash Tibrewal | 8f798e9 | 2017-09-13 15:45:47 -0700 | [diff] [blame] | 1049 | } else if (pollset->current_pollable_obj != &fd->pollable_obj) { |
| 1050 | grpc_fd *had_fd = (grpc_fd *)pollset->current_pollable_obj; |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 1051 | if (GRPC_TRACER_ON(grpc_polling_trace)) { |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 1052 | gpr_log(GPR_DEBUG, |
| 1053 | "PS:%p add fd %p; transition pollable from fd %p to multipoller", |
| 1054 | pollset, fd, had_fd); |
Craig Tiller | 86ffd65 | 2017-06-20 00:16:54 +0000 | [diff] [blame] | 1055 | } |
| 1056 | /* Introduce a spurious completion. |
| 1057 | If we do not, then it may be that the fd-specific epoll set consumed |
| 1058 | a completion without being polled, leading to a missed edge going up. */ |
Sree Kuchibhotla | c9caedd | 2017-07-14 15:46:51 -0700 | [diff] [blame] | 1059 | grpc_lfev_set_ready(exec_ctx, &had_fd->read_closure, "read"); |
| 1060 | grpc_lfev_set_ready(exec_ctx, &had_fd->write_closure, "write"); |
Craig Tiller | e16722c | 2017-05-17 21:50:37 +0000 | [diff] [blame] | 1061 | pollset_kick_all(exec_ctx, pollset); |
Yash Tibrewal | 8f798e9 | 2017-09-13 15:45:47 -0700 | [diff] [blame] | 1062 | pollset->current_pollable_obj = &pollset->pollable_obj; |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1063 | if (append_error(&error, pollable_materialize(&pollset->pollable_obj), |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 1064 | err_desc)) { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1065 | pollable_add_fd(&pollset->pollable_obj, had_fd); |
| 1066 | pollable_add_fd(&pollset->pollable_obj, fd); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 1067 | } |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 1068 | GRPC_CLOSURE_SCHED(exec_ctx, |
| 1069 | GRPC_CLOSURE_CREATE(unref_fd_no_longer_poller, had_fd, |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 1070 | grpc_schedule_on_exec_ctx), |
| 1071 | GRPC_ERROR_NONE); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 1072 | } |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1073 | return error; |
| 1074 | } |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 1075 | |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1076 | static void pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| 1077 | grpc_fd *fd) { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1078 | gpr_mu_lock(&pollset->pollable_obj.po.mu); |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1079 | grpc_error *error = pollset_add_fd_locked(exec_ctx, pollset, fd, false); |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1080 | gpr_mu_unlock(&pollset->pollable_obj.po.mu); |
Craig Tiller | e24b24d | 2017-04-06 16:05:45 -0700 | [diff] [blame] | 1081 | GRPC_LOG_IF_ERROR("pollset_add_fd", error); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1082 | } |
| 1083 | |
| 1084 | /******************************************************************************* |
| 1085 | * Pollset-set Definitions |
| 1086 | */ |
| 1087 | |
| 1088 | static grpc_pollset_set *pollset_set_create(void) { |
Yash Tibrewal | ca3c1c0 | 2017-09-07 22:47:16 -0700 | [diff] [blame] | 1089 | grpc_pollset_set *pss = (grpc_pollset_set *)gpr_zalloc(sizeof(*pss)); |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1090 | po_init(&pss->po, PO_POLLSET_SET); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1091 | return pss; |
| 1092 | } |
| 1093 | |
| 1094 | static void pollset_set_destroy(grpc_exec_ctx *exec_ctx, |
| 1095 | grpc_pollset_set *pss) { |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1096 | po_destroy(&pss->po); |
Craig Tiller | 83d5fb6 | 2017-04-10 22:13:43 +0000 | [diff] [blame] | 1097 | gpr_free(pss); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1098 | } |
| 1099 | |
| 1100 | static void pollset_set_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset_set *pss, |
| 1101 | grpc_fd *fd) { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1102 | po_join(exec_ctx, &pss->po, &fd->pollable_obj.po); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1103 | } |
| 1104 | |
| 1105 | static void pollset_set_del_fd(grpc_exec_ctx *exec_ctx, grpc_pollset_set *pss, |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1106 | grpc_fd *fd) {} |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1107 | |
| 1108 | static void pollset_set_add_pollset(grpc_exec_ctx *exec_ctx, |
| 1109 | grpc_pollset_set *pss, grpc_pollset *ps) { |
Yash Tibrewal | b2a54ac | 2017-09-13 10:18:07 -0700 | [diff] [blame] | 1110 | po_join(exec_ctx, &pss->po, &ps->pollable_obj.po); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1111 | } |
| 1112 | |
| 1113 | static void pollset_set_del_pollset(grpc_exec_ctx *exec_ctx, |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1114 | grpc_pollset_set *pss, grpc_pollset *ps) {} |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1115 | |
| 1116 | static void pollset_set_add_pollset_set(grpc_exec_ctx *exec_ctx, |
| 1117 | grpc_pollset_set *bag, |
| 1118 | grpc_pollset_set *item) { |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1119 | po_join(exec_ctx, &bag->po, &item->po); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1120 | } |
| 1121 | |
| 1122 | static void pollset_set_del_pollset_set(grpc_exec_ctx *exec_ctx, |
| 1123 | grpc_pollset_set *bag, |
Craig Tiller | f081d89 | 2017-04-07 14:04:42 -0700 | [diff] [blame] | 1124 | grpc_pollset_set *item) {} |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1125 | |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1126 | static void po_init(polling_obj *po, polling_obj_type type) { |
| 1127 | gpr_mu_init(&po->mu); |
| 1128 | po->type = type; |
| 1129 | po->group = NULL; |
| 1130 | po->next = po; |
| 1131 | po->prev = po; |
| 1132 | } |
| 1133 | |
| 1134 | static polling_group *pg_lock_latest(polling_group *pg) { |
| 1135 | /* assumes pg unlocked; consumes ref, returns ref */ |
| 1136 | gpr_mu_lock(&pg->po.mu); |
| 1137 | while (pg->po.group != NULL) { |
| 1138 | polling_group *new_pg = pg_ref(pg->po.group); |
| 1139 | gpr_mu_unlock(&pg->po.mu); |
| 1140 | pg_unref(pg); |
| 1141 | pg = new_pg; |
| 1142 | gpr_mu_lock(&pg->po.mu); |
| 1143 | } |
| 1144 | return pg; |
| 1145 | } |
| 1146 | |
| 1147 | static void po_destroy(polling_obj *po) { |
| 1148 | if (po->group != NULL) { |
| 1149 | polling_group *pg = pg_lock_latest(po->group); |
| 1150 | po->prev->next = po->next; |
| 1151 | po->next->prev = po->prev; |
Craig Tiller | 3e21ec5 | 2017-04-10 15:11:38 -0700 | [diff] [blame] | 1152 | gpr_mu_unlock(&pg->po.mu); |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1153 | pg_unref(pg); |
| 1154 | } |
| 1155 | gpr_mu_destroy(&po->mu); |
| 1156 | } |
| 1157 | |
| 1158 | static polling_group *pg_ref(polling_group *pg) { |
| 1159 | gpr_ref(&pg->refs); |
| 1160 | return pg; |
| 1161 | } |
| 1162 | |
| 1163 | static void pg_unref(polling_group *pg) { |
| 1164 | if (gpr_unref(&pg->refs)) { |
| 1165 | po_destroy(&pg->po); |
| 1166 | gpr_free(pg); |
| 1167 | } |
| 1168 | } |
| 1169 | |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 1170 | static int po_cmp(polling_obj *a, polling_obj *b) { |
| 1171 | if (a == b) return 0; |
| 1172 | if (a->type < b->type) return -1; |
| 1173 | if (a->type > b->type) return 1; |
| 1174 | if (a < b) return -1; |
| 1175 | assert(a > b); |
| 1176 | return 1; |
| 1177 | } |
| 1178 | |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1179 | static void po_join(grpc_exec_ctx *exec_ctx, polling_obj *a, polling_obj *b) { |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 1180 | switch (po_cmp(a, b)) { |
| 1181 | case 0: |
| 1182 | return; |
| 1183 | case 1: |
| 1184 | GPR_SWAP(polling_obj *, a, b); |
| 1185 | /* fall through */ |
| 1186 | case -1: |
| 1187 | gpr_mu_lock(&a->mu); |
| 1188 | gpr_mu_lock(&b->mu); |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1189 | |
Craig Tiller | d1d7fdd | 2017-04-14 16:16:24 -0700 | [diff] [blame] | 1190 | if (a->group == NULL) { |
| 1191 | if (b->group == NULL) { |
| 1192 | polling_obj *initial_po[] = {a, b}; |
| 1193 | pg_create(exec_ctx, initial_po, GPR_ARRAY_SIZE(initial_po)); |
| 1194 | gpr_mu_unlock(&a->mu); |
| 1195 | gpr_mu_unlock(&b->mu); |
| 1196 | } else { |
| 1197 | polling_group *b_group = pg_ref(b->group); |
| 1198 | gpr_mu_unlock(&b->mu); |
| 1199 | gpr_mu_unlock(&a->mu); |
| 1200 | pg_join(exec_ctx, b_group, a); |
| 1201 | } |
| 1202 | } else if (b->group == NULL) { |
| 1203 | polling_group *a_group = pg_ref(a->group); |
| 1204 | gpr_mu_unlock(&a->mu); |
| 1205 | gpr_mu_unlock(&b->mu); |
| 1206 | pg_join(exec_ctx, a_group, b); |
| 1207 | } else if (a->group == b->group) { |
| 1208 | /* nothing to do */ |
| 1209 | gpr_mu_unlock(&a->mu); |
| 1210 | gpr_mu_unlock(&b->mu); |
| 1211 | } else { |
| 1212 | polling_group *a_group = pg_ref(a->group); |
| 1213 | polling_group *b_group = pg_ref(b->group); |
| 1214 | gpr_mu_unlock(&a->mu); |
| 1215 | gpr_mu_unlock(&b->mu); |
| 1216 | pg_merge(exec_ctx, a_group, b_group); |
| 1217 | } |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1218 | } |
| 1219 | } |
| 1220 | |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1221 | static void pg_notify(grpc_exec_ctx *exec_ctx, polling_obj *a, polling_obj *b) { |
Craig Tiller | 6462fd8 | 2017-04-13 17:32:07 +0000 | [diff] [blame] | 1222 | if (a->type == PO_FD && b->type == PO_POLLSET) { |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1223 | pollset_add_fd_locked(exec_ctx, (grpc_pollset *)b, (grpc_fd *)a, true); |
Craig Tiller | 6462fd8 | 2017-04-13 17:32:07 +0000 | [diff] [blame] | 1224 | } else if (a->type == PO_POLLSET && b->type == PO_FD) { |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1225 | pollset_add_fd_locked(exec_ctx, (grpc_pollset *)a, (grpc_fd *)b, true); |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1226 | } |
| 1227 | } |
| 1228 | |
| 1229 | static void pg_broadcast(grpc_exec_ctx *exec_ctx, polling_group *from, |
| 1230 | polling_group *to) { |
| 1231 | for (polling_obj *a = from->po.next; a != &from->po; a = a->next) { |
| 1232 | for (polling_obj *b = to->po.next; b != &to->po; b = b->next) { |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1233 | if (po_cmp(a, b) < 0) { |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 1234 | gpr_mu_lock(&a->mu); |
| 1235 | gpr_mu_lock(&b->mu); |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1236 | } else { |
| 1237 | GPR_ASSERT(po_cmp(a, b) != 0); |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 1238 | gpr_mu_lock(&b->mu); |
| 1239 | gpr_mu_lock(&a->mu); |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1240 | } |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1241 | pg_notify(exec_ctx, a, b); |
Craig Tiller | f840110 | 2017-04-17 09:47:28 -0700 | [diff] [blame] | 1242 | gpr_mu_unlock(&a->mu); |
| 1243 | gpr_mu_unlock(&b->mu); |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1244 | } |
| 1245 | } |
| 1246 | } |
| 1247 | |
| 1248 | static void pg_create(grpc_exec_ctx *exec_ctx, polling_obj **initial_po, |
| 1249 | size_t initial_po_count) { |
| 1250 | /* assumes all polling objects in initial_po are locked */ |
Yash Tibrewal | ca3c1c0 | 2017-09-07 22:47:16 -0700 | [diff] [blame] | 1251 | polling_group *pg = (polling_group *)gpr_malloc(sizeof(*pg)); |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1252 | po_init(&pg->po, PO_POLLING_GROUP); |
Craig Tiller | ac328d2 | 2017-04-10 14:45:15 -0700 | [diff] [blame] | 1253 | gpr_ref_init(&pg->refs, (int)initial_po_count); |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1254 | for (size_t i = 0; i < initial_po_count; i++) { |
| 1255 | GPR_ASSERT(initial_po[i]->group == NULL); |
| 1256 | initial_po[i]->group = pg; |
| 1257 | } |
| 1258 | for (size_t i = 1; i < initial_po_count; i++) { |
| 1259 | initial_po[i]->prev = initial_po[i - 1]; |
| 1260 | } |
| 1261 | for (size_t i = 0; i < initial_po_count - 1; i++) { |
| 1262 | initial_po[i]->next = initial_po[i + 1]; |
| 1263 | } |
| 1264 | initial_po[0]->prev = &pg->po; |
| 1265 | initial_po[initial_po_count - 1]->next = &pg->po; |
| 1266 | pg->po.next = initial_po[0]; |
| 1267 | pg->po.prev = initial_po[initial_po_count - 1]; |
| 1268 | for (size_t i = 1; i < initial_po_count; i++) { |
| 1269 | for (size_t j = 0; j < i; j++) { |
| 1270 | pg_notify(exec_ctx, initial_po[i], initial_po[j]); |
| 1271 | } |
| 1272 | } |
| 1273 | } |
| 1274 | |
| 1275 | static void pg_join(grpc_exec_ctx *exec_ctx, polling_group *pg, |
| 1276 | polling_obj *po) { |
| 1277 | /* assumes neither pg nor po are locked; consumes one ref to pg */ |
| 1278 | pg = pg_lock_latest(pg); |
| 1279 | /* pg locked */ |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1280 | for (polling_obj *existing = pg->po.next /* skip pg - it's just a stub */; |
| 1281 | existing != &pg->po; existing = existing->next) { |
| 1282 | if (po_cmp(po, existing) < 0) { |
| 1283 | gpr_mu_lock(&po->mu); |
| 1284 | gpr_mu_lock(&existing->mu); |
| 1285 | } else { |
| 1286 | GPR_ASSERT(po_cmp(po, existing) != 0); |
| 1287 | gpr_mu_lock(&existing->mu); |
| 1288 | gpr_mu_lock(&po->mu); |
| 1289 | } |
| 1290 | /* pg, po, existing locked */ |
| 1291 | if (po->group != NULL) { |
| 1292 | gpr_mu_unlock(&pg->po.mu); |
| 1293 | polling_group *po_group = pg_ref(po->group); |
| 1294 | gpr_mu_unlock(&po->mu); |
| 1295 | gpr_mu_unlock(&existing->mu); |
| 1296 | pg_merge(exec_ctx, pg, po_group); |
| 1297 | /* early exit: polling obj picked up a group during joining: we needed |
| 1298 | to do a full merge */ |
| 1299 | return; |
| 1300 | } |
| 1301 | pg_notify(exec_ctx, po, existing); |
| 1302 | gpr_mu_unlock(&po->mu); |
| 1303 | gpr_mu_unlock(&existing->mu); |
| 1304 | } |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1305 | gpr_mu_lock(&po->mu); |
| 1306 | if (po->group != NULL) { |
| 1307 | gpr_mu_unlock(&pg->po.mu); |
| 1308 | polling_group *po_group = pg_ref(po->group); |
| 1309 | gpr_mu_unlock(&po->mu); |
| 1310 | pg_merge(exec_ctx, pg, po_group); |
Craig Tiller | 50480b2 | 2017-04-17 16:34:52 +0000 | [diff] [blame] | 1311 | /* early exit: polling obj picked up a group during joining: we needed |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1312 | to do a full merge */ |
| 1313 | return; |
| 1314 | } |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1315 | po->group = pg; |
| 1316 | po->next = &pg->po; |
| 1317 | po->prev = pg->po.prev; |
| 1318 | po->prev->next = po->next->prev = po; |
| 1319 | gpr_mu_unlock(&pg->po.mu); |
| 1320 | gpr_mu_unlock(&po->mu); |
| 1321 | } |
| 1322 | |
| 1323 | static void pg_merge(grpc_exec_ctx *exec_ctx, polling_group *a, |
| 1324 | polling_group *b) { |
| 1325 | for (;;) { |
Craig Tiller | 3614894 | 2017-04-13 17:45:08 +0000 | [diff] [blame] | 1326 | if (a == b) { |
| 1327 | pg_unref(a); |
| 1328 | pg_unref(b); |
| 1329 | return; |
| 1330 | } |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1331 | if (a > b) GPR_SWAP(polling_group *, a, b); |
| 1332 | gpr_mu_lock(&a->po.mu); |
| 1333 | gpr_mu_lock(&b->po.mu); |
| 1334 | if (a->po.group != NULL) { |
| 1335 | polling_group *m2 = pg_ref(a->po.group); |
| 1336 | gpr_mu_unlock(&a->po.mu); |
| 1337 | gpr_mu_unlock(&b->po.mu); |
| 1338 | pg_unref(a); |
| 1339 | a = m2; |
| 1340 | } else if (b->po.group != NULL) { |
| 1341 | polling_group *m2 = pg_ref(b->po.group); |
| 1342 | gpr_mu_unlock(&a->po.mu); |
| 1343 | gpr_mu_unlock(&b->po.mu); |
| 1344 | pg_unref(b); |
| 1345 | b = m2; |
| 1346 | } else { |
| 1347 | break; |
| 1348 | } |
| 1349 | } |
| 1350 | polling_group **unref = NULL; |
| 1351 | size_t unref_count = 0; |
| 1352 | size_t unref_cap = 0; |
| 1353 | b->po.group = a; |
| 1354 | pg_broadcast(exec_ctx, a, b); |
| 1355 | pg_broadcast(exec_ctx, b, a); |
| 1356 | while (b->po.next != &b->po) { |
| 1357 | polling_obj *po = b->po.next; |
| 1358 | gpr_mu_lock(&po->mu); |
| 1359 | if (unref_count == unref_cap) { |
| 1360 | unref_cap = GPR_MAX(8, 3 * unref_cap / 2); |
Yash Tibrewal | ca3c1c0 | 2017-09-07 22:47:16 -0700 | [diff] [blame] | 1361 | unref = (polling_group **)gpr_realloc(unref, unref_cap * sizeof(*unref)); |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1362 | } |
| 1363 | unref[unref_count++] = po->group; |
| 1364 | po->group = pg_ref(a); |
| 1365 | // unlink from b |
| 1366 | po->prev->next = po->next; |
| 1367 | po->next->prev = po->prev; |
| 1368 | // link to a |
| 1369 | po->next = &a->po; |
| 1370 | po->prev = a->po.prev; |
| 1371 | po->next->prev = po->prev->next = po; |
| 1372 | gpr_mu_unlock(&po->mu); |
| 1373 | } |
| 1374 | gpr_mu_unlock(&a->po.mu); |
| 1375 | gpr_mu_unlock(&b->po.mu); |
| 1376 | for (size_t i = 0; i < unref_count; i++) { |
| 1377 | pg_unref(unref[i]); |
| 1378 | } |
| 1379 | gpr_free(unref); |
Craig Tiller | 3614894 | 2017-04-13 17:45:08 +0000 | [diff] [blame] | 1380 | pg_unref(b); |
Craig Tiller | f18286b | 2017-04-10 14:44:09 -0700 | [diff] [blame] | 1381 | } |
| 1382 | |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1383 | /******************************************************************************* |
| 1384 | * Event engine binding |
| 1385 | */ |
| 1386 | |
| 1387 | static void shutdown_engine(void) { |
| 1388 | fd_global_shutdown(); |
| 1389 | pollset_global_shutdown(); |
| 1390 | } |
| 1391 | |
| 1392 | static const grpc_event_engine_vtable vtable = { |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame^] | 1393 | sizeof(grpc_pollset), |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1394 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame^] | 1395 | fd_create, |
| 1396 | fd_wrapped_fd, |
| 1397 | fd_orphan, |
| 1398 | fd_shutdown, |
| 1399 | fd_notify_on_read, |
| 1400 | fd_notify_on_write, |
| 1401 | fd_is_shutdown, |
| 1402 | fd_get_read_notifier_pollset, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1403 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame^] | 1404 | pollset_init, |
| 1405 | pollset_shutdown, |
| 1406 | pollset_destroy, |
| 1407 | pollset_work, |
| 1408 | pollset_kick, |
| 1409 | pollset_add_fd, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1410 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame^] | 1411 | pollset_set_create, |
| 1412 | pollset_set_destroy, |
| 1413 | pollset_set_add_pollset, |
| 1414 | pollset_set_del_pollset, |
| 1415 | pollset_set_add_pollset_set, |
| 1416 | pollset_set_del_pollset_set, |
| 1417 | pollset_set_add_fd, |
| 1418 | pollset_set_del_fd, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1419 | |
Yash Tibrewal | 533d118 | 2017-09-18 10:48:22 -0700 | [diff] [blame^] | 1420 | shutdown_engine, |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1421 | }; |
| 1422 | |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 1423 | const grpc_event_engine_vtable *grpc_init_epollex_linux( |
| 1424 | bool explicitly_requested) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1425 | if (!grpc_has_wakeup_fd()) { |
| 1426 | return NULL; |
| 1427 | } |
| 1428 | |
Craig Tiller | 819cd88 | 2017-04-25 13:18:22 -0700 | [diff] [blame] | 1429 | if (!grpc_is_epollexclusive_available()) { |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1430 | return NULL; |
| 1431 | } |
| 1432 | |
| 1433 | fd_global_init(); |
| 1434 | |
| 1435 | if (!GRPC_LOG_IF_ERROR("pollset_global_init", pollset_global_init())) { |
Craig Tiller | 54d388d | 2017-04-14 16:20:45 -0700 | [diff] [blame] | 1436 | pollset_global_shutdown(); |
| 1437 | fd_global_shutdown(); |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1438 | return NULL; |
| 1439 | } |
| 1440 | |
| 1441 | return &vtable; |
| 1442 | } |
| 1443 | |
| 1444 | #else /* defined(GRPC_LINUX_EPOLL) */ |
| 1445 | #if defined(GRPC_POSIX_SOCKET) |
| 1446 | #include "src/core/lib/iomgr/ev_posix.h" |
| 1447 | /* If GRPC_LINUX_EPOLL is not defined, it means epoll is not available. Return |
| 1448 | * NULL */ |
Craig Tiller | 6c8383a | 2017-05-05 16:54:42 +0000 | [diff] [blame] | 1449 | const grpc_event_engine_vtable *grpc_init_epollex_linux( |
| 1450 | bool explicitly_requested) { |
| 1451 | return NULL; |
| 1452 | } |
Craig Tiller | dd86b69 | 2017-04-06 10:43:11 -0700 | [diff] [blame] | 1453 | #endif /* defined(GRPC_POSIX_SOCKET) */ |
| 1454 | |
| 1455 | #endif /* !defined(GRPC_LINUX_EPOLL) */ |