mono/metadata/threadpool-io.c

   1 /*
   2  * threadpool-io.c: Microsoft IO threadpool runtime support
   3  *
   4  * Author:
   5  *      Ludovic Henry (ludovic.henry@xamarin.com)
   6  *
   7  * Copyright 2015 Xamarin, Inc (http://www.xamarin.com)
   8  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
   9  */
  10
  11 #include <config.h>
  12
  13 #ifndef DISABLE_SOCKETS
  14
  15 #include <glib.h>
  16
  17 #if defined(HOST_WIN32)
  18 #include <windows.h>
  19 #else
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #endif
  23
  24 #include <mono/metadata/gc-internals.h>
  25 #include <mono/metadata/mono-mlist.h>
  26 #include <mono/metadata/threadpool.h>
  27 #include <mono/metadata/threadpool-io.h>
  28 #include <mono/utils/atomic.h>
  29 #include <mono/utils/mono-threads.h>
  30 #include <mono/utils/mono-lazy-init.h>
  31 #include <mono/utils/mono-logger-internals.h>
  32 #include <mono/utils/w32api.h>
  33
  34 typedef struct {
  35         gboolean (*init) (gint wakeup_pipe_fd);
  36         void     (*register_fd) (gint fd, gint events, gboolean is_new);
  37         void     (*remove_fd) (gint fd);
  38         gint     (*event_wait) (void (*callback) (gint fd, gint events, gpointer user_data), gpointer user_data);
  39 } ThreadPoolIOBackend;
  40
  41 /* Keep in sync with System.IOOperation in mcs/class/System/System/IOSelector.cs */
  42 enum MonoIOOperation {
  43         EVENT_IN   = 1 << 0,
  44         EVENT_OUT  = 1 << 1,
  45         EVENT_ERR  = 1 << 2, /* not in managed */
  46 };
  47
  48 #include "threadpool-io-epoll.c"
  49 #include "threadpool-io-kqueue.c"
  50 #include "threadpool-io-poll.c"
  51
  52 #define UPDATES_CAPACITY 128
  53
  54 /* Keep in sync with System.IOSelectorJob in mcs/class/System/System/IOSelector.cs */
  55 struct _MonoIOSelectorJob {
  56         MonoObject object;
  57         gint32 operation;
  58         MonoObject *callback;
  59         MonoObject *state;
  60 };
  61
  62 typedef enum {
  63         UPDATE_EMPTY = 0,
  64         UPDATE_ADD,
  65         UPDATE_REMOVE_SOCKET,
  66         UPDATE_REMOVE_DOMAIN,
  67 } ThreadPoolIOUpdateType;
  68
  69 typedef struct {
  70         gint fd;
  71         MonoIOSelectorJob *job;
  72 } ThreadPoolIOUpdate_Add;
  73
  74 typedef struct {
  75         gint fd;
  76 } ThreadPoolIOUpdate_RemoveSocket;
  77
  78 typedef struct {
  79         MonoDomain *domain;
  80 } ThreadPoolIOUpdate_RemoveDomain;
  81
  82 typedef struct {
  83         ThreadPoolIOUpdateType type;
  84         union {
  85                 ThreadPoolIOUpdate_Add add;
  86                 ThreadPoolIOUpdate_RemoveSocket remove_socket;
  87                 ThreadPoolIOUpdate_RemoveDomain remove_domain;
  88         } data;
  89 } ThreadPoolIOUpdate;
  90
  91 typedef struct {
  92         ThreadPoolIOBackend backend;
  93
  94         ThreadPoolIOUpdate updates [UPDATES_CAPACITY];
  95         gint updates_size;
  96         MonoCoopMutex updates_lock;
  97         MonoCoopCond updates_cond;
  98
  99 #if !defined(HOST_WIN32)
 100         gint wakeup_pipes [2];
 101 #else
 102         SOCKET wakeup_pipes [2];
 103 #endif
 104 } ThreadPoolIO;
 105
 106 static mono_lazy_init_t io_status = MONO_LAZY_INIT_STATUS_NOT_INITIALIZED;
 107
 108 static gboolean io_selector_running = FALSE;
 109
 110 static ThreadPoolIO* threadpool_io;
 111
 112 static MonoIOSelectorJob*
 113 get_job_for_event (MonoMList **list, gint32 event)
 114 {
 115         MonoMList *current;
 116
 117         g_assert (list);
 118
 119         for (current = *list; current; current = mono_mlist_next (current)) {
 120                 MonoIOSelectorJob *job = (MonoIOSelectorJob*) mono_mlist_get_data (current);
 121                 if (job->operation == event) {
 122                         *list = mono_mlist_remove_item (*list, current);
 123                         return job;
 124                 }
 125         }
 126
 127         return NULL;
 128 }
 129
 130 static gint
 131 get_operations_for_jobs (MonoMList *list)
 132 {
 133         MonoMList *current;
 134         gint operations = 0;
 135
 136         for (current = list; current; current = mono_mlist_next (current))
 137                 operations |= ((MonoIOSelectorJob*) mono_mlist_get_data (current))->operation;
 138
 139         return operations;
 140 }
 141
 142 static void
 143 selector_thread_wakeup (void)
 144 {
 145         gchar msg = 'c';
 146         gint written;
 147
 148         for (;;) {
 149 #if !defined(HOST_WIN32)
 150                 written = write (threadpool_io->wakeup_pipes [1], &msg, 1);
 151                 if (written == 1)
 152                         break;
 153                 if (written == -1) {
 154                         g_warning ("selector_thread_wakeup: write () failed, error (%d) %s\n", errno, g_strerror (errno));
 155                         break;
 156                 }
 157 #else
 158                 written = send (threadpool_io->wakeup_pipes [1], &msg, 1, 0);
 159                 if (written == 1)
 160                         break;
 161                 if (written == SOCKET_ERROR) {
 162                         g_warning ("selector_thread_wakeup: write () failed, error (%d)\n", WSAGetLastError ());
 163                         break;
 164                 }
 165 #endif
 166         }
 167 }
 168
 169 static void
 170 selector_thread_wakeup_drain_pipes (void)
 171 {
 172         gchar buffer [128];
 173         gint received;
 174
 175         for (;;) {
 176 #if !defined(HOST_WIN32)
 177                 received = read (threadpool_io->wakeup_pipes [0], buffer, sizeof (buffer));
 178                 if (received == 0)
 179                         break;
 180                 if (received == -1) {
 181                         if (errno != EINTR && errno != EAGAIN)
 182                                 g_warning ("selector_thread_wakeup_drain_pipes: read () failed, error (%d) %s\n", errno, g_strerror (errno));
 183                         break;
 184                 }
 185 #else
 186                 received = recv (threadpool_io->wakeup_pipes [0], buffer, sizeof (buffer), 0);
 187                 if (received == 0)
 188                         break;
 189                 if (received == SOCKET_ERROR) {
 190                         if (WSAGetLastError () != WSAEINTR && WSAGetLastError () != WSAEWOULDBLOCK)
 191                                 g_warning ("selector_thread_wakeup_drain_pipes: recv () failed, error (%d) %s\n", WSAGetLastError ());
 192                         break;
 193                 }
 194 #endif
 195         }
 196 }
 197
 198 typedef struct {
 199         MonoDomain *domain;
 200         MonoGHashTable *states;
 201 } FilterSockaresForDomainData;
 202
 203 static void
 204 filter_jobs_for_domain (gpointer key, gpointer value, gpointer user_data)
 205 {
 206         FilterSockaresForDomainData *data;
 207         MonoMList *list = (MonoMList *)value, *element;
 208         MonoDomain *domain;
 209         MonoGHashTable *states;
 210
 211         g_assert (user_data);
 212         data = (FilterSockaresForDomainData *)user_data;
 213         domain = data->domain;
 214         states = data->states;
 215
 216         for (element = list; element; element = mono_mlist_next (element)) {
 217                 MonoIOSelectorJob *job = (MonoIOSelectorJob*) mono_mlist_get_data (element);
 218                 if (mono_object_domain (job) == domain)
 219                         mono_mlist_set_data (element, NULL);
 220         }
 221
 222         /* we skip all the first elements which are NULL */
 223         for (; list; list = mono_mlist_next (list)) {
 224                 if (mono_mlist_get_data (list))
 225                         break;
 226         }
 227
 228         if (list) {
 229                 g_assert (mono_mlist_get_data (list));
 230
 231                 /* we delete all the NULL elements after the first one */
 232                 for (element = list; element;) {
 233                         MonoMList *next;
 234                         if (!(next = mono_mlist_next (element)))
 235                                 break;
 236                         if (mono_mlist_get_data (next))
 237                                 element = next;
 238                         else
 239                                 mono_mlist_set_next (element, mono_mlist_next (next));
 240                 }
 241         }
 242
 243         mono_g_hash_table_replace (states, key, list);
 244 }
 245
 246 static void
 247 wait_callback (gint fd, gint events, gpointer user_data)
 248 {
 249         MonoError error;
 250
 251         if (mono_runtime_is_shutting_down ())
 252                 return;
 253
 254         if (fd == threadpool_io->wakeup_pipes [0]) {
 255                 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_THREADPOOL, "io threadpool: wke");
 256                 selector_thread_wakeup_drain_pipes ();
 257         } else {
 258                 MonoGHashTable *states;
 259                 MonoMList *list = NULL;
 260                 gpointer k;
 261                 gboolean remove_fd = FALSE;
 262                 gint operations;
 263
 264                 g_assert (user_data);
 265                 states = (MonoGHashTable *)user_data;
 266
 267                 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_THREADPOOL, "io threadpool: cal fd %3d, events = %2s | %2s | %3s",
 268                         fd, (events & EVENT_IN) ? "RD" : "..", (events & EVENT_OUT) ? "WR" : "..", (events & EVENT_ERR) ? "ERR" : "...");
 269
 270                 if (!mono_g_hash_table_lookup_extended (states, GINT_TO_POINTER (fd), &k, (gpointer*) &list))
 271                         g_error ("wait_callback: fd %d not found in states table", fd);
 272
 273                 if (list && (events & EVENT_IN) != 0) {
 274                         MonoIOSelectorJob *job = get_job_for_event (&list, EVENT_IN);
 275                         if (job) {
 276                                 mono_threadpool_enqueue_work_item (((MonoObject*) job)->vtable->domain, (MonoObject*) job, &error);
 277                                 mono_error_assert_ok (&error);
 278                         }
 279
 280                 }
 281                 if (list && (events & EVENT_OUT) != 0) {
 282                         MonoIOSelectorJob *job = get_job_for_event (&list, EVENT_OUT);
 283                         if (job) {
 284                                 mono_threadpool_enqueue_work_item (((MonoObject*) job)->vtable->domain, (MonoObject*) job, &error);
 285                                 mono_error_assert_ok (&error);
 286                         }
 287                 }
 288
 289                 remove_fd = (events & EVENT_ERR) == EVENT_ERR;
 290                 if (!remove_fd) {
 291                         mono_g_hash_table_replace (states, GINT_TO_POINTER (fd), list);
 292
 293                         operations = get_operations_for_jobs (list);
 294
 295                         mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_THREADPOOL, "io threadpool: res fd %3d, events = %2s | %2s | %3s",
 296                                 fd, (operations & EVENT_IN) ? "RD" : "..", (operations & EVENT_OUT) ? "WR" : "..", (operations & EVENT_ERR) ? "ERR" : "...");
 297
 298                         threadpool_io->backend.register_fd (fd, operations, FALSE);
 299                 } else {
 300                         mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_THREADPOOL, "io threadpool: err fd %d", fd);
 301
 302                         mono_g_hash_table_remove (states, GINT_TO_POINTER (fd));
 303
 304                         threadpool_io->backend.remove_fd (fd);
 305                 }
 306         }
 307 }
 308
 309 static void
 310 selector_thread_interrupt (gpointer unused)
 311 {
 312         selector_thread_wakeup ();
 313 }
 314
 315 static gsize WINAPI
 316 selector_thread (gpointer data)
 317 {
 318         MonoError error;
 319         MonoGHashTable *states;
 320
 321         io_selector_running = TRUE;
 322
 323         if (mono_runtime_is_shutting_down ()) {
 324                 io_selector_running = FALSE;
 325                 return 0;
 326         }
 327
 328         states = mono_g_hash_table_new_type (g_direct_hash, g_direct_equal, MONO_HASH_VALUE_GC, MONO_ROOT_SOURCE_THREAD_POOL, "i/o thread pool states table");
 329
 330         while (!mono_runtime_is_shutting_down ()) {
 331                 gint i, j;
 332                 gint res;
 333                 gboolean interrupted = FALSE;
 334
 335                 if (mono_thread_interruption_checkpoint ())
 336                         continue;
 337
 338                 mono_coop_mutex_lock (&threadpool_io->updates_lock);
 339
 340                 for (i = 0; i < threadpool_io->updates_size; ++i) {
 341                         ThreadPoolIOUpdate *update = &threadpool_io->updates [i];
 342
 343                         switch (update->type) {
 344                         case UPDATE_EMPTY:
 345                                 break;
 346                         case UPDATE_ADD: {
 347                                 gint fd;
 348                                 gint operations;
 349                                 gpointer k;
 350                                 gboolean exists;
 351                                 MonoMList *list = NULL;
 352                                 MonoIOSelectorJob *job;
 353
 354                                 fd = update->data.add.fd;
 355                                 g_assert (fd >= 0);
 356
 357                                 job = update->data.add.job;
 358                                 g_assert (job);
 359
 360                                 exists = mono_g_hash_table_lookup_extended (states, GINT_TO_POINTER (fd), &k, (gpointer*) &list);
 361                                 list = mono_mlist_append_checked (list, (MonoObject*) job, &error);
 362                                 mono_error_assert_ok (&error);
 363                                 mono_g_hash_table_replace (states, GINT_TO_POINTER (fd), list);
 364
 365                                 operations = get_operations_for_jobs (list);
 366
 367                                 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_THREADPOOL, "io threadpool: %3s fd %3d, operations = %2s | %2s | %3s",
 368                                         exists ? "mod" : "add", fd, (operations & EVENT_IN) ? "RD" : "..", (operations & EVENT_OUT) ? "WR" : "..", (operations & EVENT_ERR) ? "ERR" : "...");
 369
 370                                 threadpool_io->backend.register_fd (fd, operations, !exists);
 371
 372                                 break;
 373                         }
 374                         case UPDATE_REMOVE_SOCKET: {
 375                                 gint fd;
 376                                 gpointer k;
 377                                 MonoMList *list = NULL;
 378
 379                                 fd = update->data.remove_socket.fd;
 380                                 g_assert (fd >= 0);
 381
 382                                 if (mono_g_hash_table_lookup_extended (states, GINT_TO_POINTER (fd), &k, (gpointer*) &list)) {
 383                                         mono_g_hash_table_remove (states, GINT_TO_POINTER (fd));
 384
 385                                         for (j = i + 1; j < threadpool_io->updates_size; ++j) {
 386                                                 ThreadPoolIOUpdate *update = &threadpool_io->updates [j];
 387                                                 if (update->type == UPDATE_ADD && update->data.add.fd == fd)
 388                                                         memset (update, 0, sizeof (ThreadPoolIOUpdate));
 389                                         }
 390
 391                                         for (; list; list = mono_mlist_remove_item (list, list)) {
 392                                                 mono_threadpool_enqueue_work_item (mono_object_domain (mono_mlist_get_data (list)), mono_mlist_get_data (list), &error);
 393                                                 mono_error_assert_ok (&error);
 394                                         }
 395
 396                                         mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_THREADPOOL, "io threadpool: del fd %3d", fd);
 397                                         threadpool_io->backend.remove_fd (fd);
 398                                 }
 399
 400                                 break;
 401                         }
 402                         case UPDATE_REMOVE_DOMAIN: {
 403                                 MonoDomain *domain;
 404
 405                                 domain = update->data.remove_domain.domain;
 406                                 g_assert (domain);
 407
 408                                 FilterSockaresForDomainData user_data = { .domain = domain, .states = states };
 409                                 mono_g_hash_table_foreach (states, filter_jobs_for_domain, &user_data);
 410
 411                                 for (j = i + 1; j < threadpool_io->updates_size; ++j) {
 412                                         ThreadPoolIOUpdate *update = &threadpool_io->updates [j];
 413                                         if (update->type == UPDATE_ADD && mono_object_domain (update->data.add.job) == domain)
 414                                                 memset (update, 0, sizeof (ThreadPoolIOUpdate));
 415                                 }
 416
 417                                 break;
 418                         }
 419                         default:
 420                                 g_assert_not_reached ();
 421                         }
 422                 }
 423
 424                 mono_coop_cond_broadcast (&threadpool_io->updates_cond);
 425
 426                 if (threadpool_io->updates_size > 0) {
 427                         threadpool_io->updates_size = 0;
 428                         memset (&threadpool_io->updates, 0, UPDATES_CAPACITY * sizeof (ThreadPoolIOUpdate));
 429                 }
 430
 431                 mono_coop_mutex_unlock (&threadpool_io->updates_lock);
 432
 433                 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_THREADPOOL, "io threadpool: wai");
 434
 435                 mono_thread_info_install_interrupt (selector_thread_interrupt, NULL, &interrupted);
 436                 if (interrupted)
 437                         continue;
 438
 439                 res = threadpool_io->backend.event_wait (wait_callback, states);
 440                 if (res == -1)
 441                         break;
 442
 443                 mono_thread_info_uninstall_interrupt (&interrupted);
 444         }
 445
 446         mono_g_hash_table_destroy (states);
 447
 448         io_selector_running = FALSE;
 449
 450         return 0;
 451 }
 452
 453 /* Locking: threadpool_io->updates_lock must be held */
 454 static ThreadPoolIOUpdate*
 455 update_get_new (void)
 456 {
 457         ThreadPoolIOUpdate *update = NULL;
 458         g_assert (threadpool_io->updates_size <= UPDATES_CAPACITY);
 459
 460         while (threadpool_io->updates_size == UPDATES_CAPACITY) {
 461                 /* we wait for updates to be applied in the selector_thread and we loop
 462                  * as long as none are available. if it happends too much, then we need
 463                  * to increase UPDATES_CAPACITY */
 464                 mono_coop_cond_wait (&threadpool_io->updates_cond, &threadpool_io->updates_lock);
 465         }
 466
 467         g_assert (threadpool_io->updates_size < UPDATES_CAPACITY);
 468
 469         update = &threadpool_io->updates [threadpool_io->updates_size ++];
 470
 471         return update;
 472 }
 473
 474 static void
 475 wakeup_pipes_init (void)
 476 {
 477 #if !defined(HOST_WIN32)
 478         if (pipe (threadpool_io->wakeup_pipes) == -1)
 479                 g_error ("wakeup_pipes_init: pipe () failed, error (%d) %s\n", errno, g_strerror (errno));
 480         if (fcntl (threadpool_io->wakeup_pipes [0], F_SETFL, O_NONBLOCK) == -1)
 481                 g_error ("wakeup_pipes_init: fcntl () failed, error (%d) %s\n", errno, g_strerror (errno));
 482 #else
 483         struct sockaddr_in client;
 484         struct sockaddr_in server;
 485         SOCKET server_sock;
 486         gulong arg;
 487         gint size;
 488
 489         server_sock = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
 490         g_assert (server_sock != INVALID_SOCKET);
 491         threadpool_io->wakeup_pipes [1] = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
 492         g_assert (threadpool_io->wakeup_pipes [1] != INVALID_SOCKET);
 493
 494         server.sin_family = AF_INET;
 495         server.sin_addr.s_addr = inet_addr ("127.0.0.1");
 496         server.sin_port = 0;
 497         if (bind (server_sock, (SOCKADDR*) &server, sizeof (server)) == SOCKET_ERROR) {
 498                 closesocket (server_sock);
 499                 g_error ("wakeup_pipes_init: bind () failed, error (%d)\n", WSAGetLastError ());
 500         }
 501
 502         size = sizeof (server);
 503         if (getsockname (server_sock, (SOCKADDR*) &server, &size) == SOCKET_ERROR) {
 504                 closesocket (server_sock);
 505                 g_error ("wakeup_pipes_init: getsockname () failed, error (%d)\n", WSAGetLastError ());
 506         }
 507         if (listen (server_sock, 1024) == SOCKET_ERROR) {
 508                 closesocket (server_sock);
 509                 g_error ("wakeup_pipes_init: listen () failed, error (%d)\n", WSAGetLastError ());
 510         }
 511         if (connect ((SOCKET) threadpool_io->wakeup_pipes [1], (SOCKADDR*) &server, sizeof (server)) == SOCKET_ERROR) {
 512                 closesocket (server_sock);
 513                 g_error ("wakeup_pipes_init: connect () failed, error (%d)\n", WSAGetLastError ());
 514         }
 515
 516         size = sizeof (client);
 517         threadpool_io->wakeup_pipes [0] = accept (server_sock, (SOCKADDR *) &client, &size);
 518         g_assert (threadpool_io->wakeup_pipes [0] != INVALID_SOCKET);
 519
 520         arg = 1;
 521         if (ioctlsocket (threadpool_io->wakeup_pipes [0], FIONBIO, &arg) == SOCKET_ERROR) {
 522                 closesocket (threadpool_io->wakeup_pipes [0]);
 523                 closesocket (server_sock);
 524                 g_error ("wakeup_pipes_init: ioctlsocket () failed, error (%d)\n", WSAGetLastError ());
 525         }
 526
 527         closesocket (server_sock);
 528 #endif
 529 }
 530
 531 static void
 532 initialize (void)
 533 {
 534         g_assert (!threadpool_io);
 535         threadpool_io = g_new0 (ThreadPoolIO, 1);
 536         g_assert (threadpool_io);
 537
 538         mono_coop_mutex_init (&threadpool_io->updates_lock);
 539         mono_coop_cond_init (&threadpool_io->updates_cond);
 540         mono_gc_register_root ((char *)&threadpool_io->updates [0], sizeof (threadpool_io->updates), MONO_GC_DESCRIPTOR_NULL, MONO_ROOT_SOURCE_THREAD_POOL, "i/o thread pool updates list");
 541
 542         threadpool_io->updates_size = 0;
 543
 544         threadpool_io->backend = backend_poll;
 545         if (g_getenv ("MONO_ENABLE_AIO") != NULL) {
 546 #if defined(HAVE_EPOLL)
 547                 threadpool_io->backend = backend_epoll;
 548 #elif defined(HAVE_KQUEUE)
 549                 threadpool_io->backend = backend_kqueue;
 550 #endif
 551         }
 552
 553         wakeup_pipes_init ();
 554
 555         if (!threadpool_io->backend.init (threadpool_io->wakeup_pipes [0]))
 556                 g_error ("initialize: backend->init () failed");
 557
 558         MonoError error;
 559         if (!mono_thread_create_internal (mono_get_root_domain (), selector_thread, NULL, TRUE, SMALL_STACK, &error))
 560                 g_error ("initialize: mono_thread_create_internal () failed due to %s", mono_error_get_message (&error));
 561 }
 562
 563 static void
 564 cleanup (void)
 565 {
 566         // FIXME destroy everything
 567 }
 568
 569 void
 570 mono_threadpool_io_cleanup (void)
 571 {
 572         mono_lazy_cleanup (&io_status, cleanup);
 573 }
 574
 575 void
 576 ves_icall_System_IOSelector_Add (gpointer handle, MonoIOSelectorJob *job)
 577 {
 578         ThreadPoolIOUpdate *update;
 579
 580         g_assert (handle);
 581
 582         g_assert ((job->operation == EVENT_IN) ^ (job->operation == EVENT_OUT));
 583         g_assert (job->callback);
 584
 585         if (mono_runtime_is_shutting_down ())
 586                 return;
 587         if (mono_domain_is_unloading (mono_object_domain (job)))
 588                 return;
 589
 590         mono_lazy_initialize (&io_status, initialize);
 591
 592         mono_coop_mutex_lock (&threadpool_io->updates_lock);
 593
 594         update = update_get_new ();
 595         update->type = UPDATE_ADD;
 596         update->data.add.fd = GPOINTER_TO_INT (handle);
 597         update->data.add.job = job;
 598         mono_memory_barrier (); /* Ensure this is safely published before we wake up the selector */
 599
 600         selector_thread_wakeup ();
 601
 602         mono_coop_mutex_unlock (&threadpool_io->updates_lock);
 603 }
 604
 605 void
 606 ves_icall_System_IOSelector_Remove (gpointer handle)
 607 {
 608         mono_threadpool_io_remove_socket (GPOINTER_TO_INT (handle));
 609 }
 610
 611 void
 612 mono_threadpool_io_remove_socket (int fd)
 613 {
 614         ThreadPoolIOUpdate *update;
 615
 616         if (!mono_lazy_is_initialized (&io_status))
 617                 return;
 618
 619         mono_coop_mutex_lock (&threadpool_io->updates_lock);
 620
 621         update = update_get_new ();
 622         update->type = UPDATE_REMOVE_SOCKET;
 623         update->data.add.fd = fd;
 624         mono_memory_barrier (); /* Ensure this is safely published before we wake up the selector */
 625
 626         selector_thread_wakeup ();
 627
 628         mono_coop_cond_wait (&threadpool_io->updates_cond, &threadpool_io->updates_lock);
 629
 630         mono_coop_mutex_unlock (&threadpool_io->updates_lock);
 631 }
 632
 633 void
 634 mono_threadpool_io_remove_domain_jobs (MonoDomain *domain)
 635 {
 636         ThreadPoolIOUpdate *update;
 637
 638         if (!mono_lazy_is_initialized (&io_status))
 639                 return;
 640
 641         mono_coop_mutex_lock (&threadpool_io->updates_lock);
 642
 643         update = update_get_new ();
 644         update->type = UPDATE_REMOVE_DOMAIN;
 645         update->data.remove_domain.domain = domain;
 646         mono_memory_barrier (); /* Ensure this is safely published before we wake up the selector */
 647
 648         selector_thread_wakeup ();
 649
 650         mono_coop_cond_wait (&threadpool_io->updates_cond, &threadpool_io->updates_lock);
 651
 652         mono_coop_mutex_unlock (&threadpool_io->updates_lock);
 653 }
 654
 655 #else
 656
 657 void
 658 ves_icall_System_IOSelector_Add (gpointer handle, MonoIOSelectorJob *job)
 659 {
 660         g_assert_not_reached ();
 661 }
 662
 663 void
 664 ves_icall_System_IOSelector_Remove (gpointer handle)
 665 {
 666         g_assert_not_reached ();
 667 }
 668
 669 void
 670 mono_threadpool_io_cleanup (void)
 671 {
 672         g_assert_not_reached ();
 673 }
 674
 675 void
 676 mono_threadpool_io_remove_socket (int fd)
 677 {
 678         g_assert_not_reached ();
 679 }
 680
 681 void
 682 mono_threadpool_io_remove_domain_jobs (MonoDomain *domain)
 683 {
 684         g_assert_not_reached ();
 685 }
 686
 687 #endif