2 * threadpool-ms-io.c: Microsoft IO threadpool runtime support
5 * Ludovic Henry (ludovic.henry@xamarin.com)
7 * Copyright 2015 Xamarin, Inc (http://www.xamarin.com)
12 #ifndef DISABLE_SOCKETS
16 #if defined(HOST_WIN32)
23 #include <mono/metadata/gc-internals.h>
24 #include <mono/metadata/mono-mlist.h>
25 #include <mono/metadata/threadpool-ms.h>
26 #include <mono/metadata/threadpool-ms-io.h>
27 #include <mono/utils/atomic.h>
28 #include <mono/utils/mono-threads.h>
29 #include <mono/utils/mono-lazy-init.h>
30 #include <mono/utils/mono-logger-internals.h>
33 gboolean (*init) (gint wakeup_pipe_fd);
34 void (*cleanup) (void);
35 void (*register_fd) (gint fd, gint events, gboolean is_new);
36 void (*remove_fd) (gint fd);
37 gint (*event_wait) (void (*callback) (gint fd, gint events, gpointer user_data), gpointer user_data);
38 } ThreadPoolIOBackend;
40 /* Keep in sync with System.IOOperation in mcs/class/System/System/IOSelector.cs */
41 enum MonoIOOperation {
44 EVENT_ERR = 1 << 2, /* not in managed */
47 #include "threadpool-ms-io-epoll.c"
48 #include "threadpool-ms-io-kqueue.c"
49 #include "threadpool-ms-io-poll.c"
51 #define UPDATES_CAPACITY 128
53 /* Keep in sync with System.IOSelectorJob in mcs/class/System/System/IOSelector.cs */
54 struct _MonoIOSelectorJob {
66 } ThreadPoolIOUpdateType;
70 MonoIOSelectorJob *job;
71 } ThreadPoolIOUpdate_Add;
75 } ThreadPoolIOUpdate_RemoveSocket;
79 } ThreadPoolIOUpdate_RemoveDomain;
82 ThreadPoolIOUpdateType type;
84 ThreadPoolIOUpdate_Add add;
85 ThreadPoolIOUpdate_RemoveSocket remove_socket;
86 ThreadPoolIOUpdate_RemoveDomain remove_domain;
91 ThreadPoolIOBackend backend;
93 ThreadPoolIOUpdate updates [UPDATES_CAPACITY];
95 MonoCoopMutex updates_lock;
96 MonoCoopCond updates_cond;
98 #if !defined(HOST_WIN32)
99 gint wakeup_pipes [2];
101 SOCKET wakeup_pipes [2];
105 static mono_lazy_init_t io_status = MONO_LAZY_INIT_STATUS_NOT_INITIALIZED;
107 static gboolean io_selector_running = FALSE;
109 static ThreadPoolIO* threadpool_io;
111 static MonoIOSelectorJob*
112 get_job_for_event (MonoMList **list, gint32 event)
118 for (current = *list; current; current = mono_mlist_next (current)) {
119 MonoIOSelectorJob *job = (MonoIOSelectorJob*) mono_mlist_get_data (current);
120 if (job->operation == event) {
121 *list = mono_mlist_remove_item (*list, current);
130 get_operations_for_jobs (MonoMList *list)
135 for (current = list; current; current = mono_mlist_next (current))
136 operations |= ((MonoIOSelectorJob*) mono_mlist_get_data (current))->operation;
142 selector_thread_wakeup (void)
148 #if !defined(HOST_WIN32)
149 written = write (threadpool_io->wakeup_pipes [1], &msg, 1);
153 g_warning ("selector_thread_wakeup: write () failed, error (%d) %s\n", errno, g_strerror (errno));
157 written = send (threadpool_io->wakeup_pipes [1], &msg, 1, 0);
160 if (written == SOCKET_ERROR) {
161 g_warning ("selector_thread_wakeup: write () failed, error (%d)\n", WSAGetLastError ());
169 selector_thread_wakeup_drain_pipes (void)
175 #if !defined(HOST_WIN32)
176 received = read (threadpool_io->wakeup_pipes [0], buffer, sizeof (buffer));
179 if (received == -1) {
180 if (errno != EINTR && errno != EAGAIN)
181 g_warning ("selector_thread_wakeup_drain_pipes: read () failed, error (%d) %s\n", errno, g_strerror (errno));
185 received = recv (threadpool_io->wakeup_pipes [0], buffer, sizeof (buffer), 0);
188 if (received == SOCKET_ERROR) {
189 if (WSAGetLastError () != WSAEINTR && WSAGetLastError () != WSAEWOULDBLOCK)
190 g_warning ("selector_thread_wakeup_drain_pipes: recv () failed, error (%d) %s\n", WSAGetLastError ());
199 MonoGHashTable *states;
200 } FilterSockaresForDomainData;
203 filter_jobs_for_domain (gpointer key, gpointer value, gpointer user_data)
205 FilterSockaresForDomainData *data;
206 MonoMList *list = (MonoMList *)value, *element;
208 MonoGHashTable *states;
210 g_assert (user_data);
211 data = (FilterSockaresForDomainData *)user_data;
212 domain = data->domain;
213 states = data->states;
215 for (element = list; element; element = mono_mlist_next (element)) {
216 MonoIOSelectorJob *job = (MonoIOSelectorJob*) mono_mlist_get_data (element);
217 if (mono_object_domain (job) == domain)
218 mono_mlist_set_data (element, NULL);
221 /* we skip all the first elements which are NULL */
222 for (; list; list = mono_mlist_next (list)) {
223 if (mono_mlist_get_data (list))
228 g_assert (mono_mlist_get_data (list));
230 /* we delete all the NULL elements after the first one */
231 for (element = list; element;) {
233 if (!(next = mono_mlist_next (element)))
235 if (mono_mlist_get_data (next))
238 mono_mlist_set_next (element, mono_mlist_next (next));
242 mono_g_hash_table_replace (states, key, list);
246 wait_callback (gint fd, gint events, gpointer user_data)
248 if (mono_runtime_is_shutting_down ())
251 if (fd == threadpool_io->wakeup_pipes [0]) {
252 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_THREADPOOL, "io threadpool: wke");
253 selector_thread_wakeup_drain_pipes ();
255 MonoGHashTable *states;
256 MonoMList *list = NULL;
258 gboolean remove_fd = FALSE;
261 g_assert (user_data);
262 states = (MonoGHashTable *)user_data;
264 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_THREADPOOL, "io threadpool: cal fd %3d, events = %2s | %2s | %3s",
265 fd, (events & EVENT_IN) ? "RD" : "..", (events & EVENT_OUT) ? "WR" : "..", (events & EVENT_ERR) ? "ERR" : "...");
267 if (!mono_g_hash_table_lookup_extended (states, GINT_TO_POINTER (fd), &k, (gpointer*) &list))
268 g_error ("wait_callback: fd %d not found in states table", fd);
270 if (list && (events & EVENT_IN) != 0) {
271 MonoIOSelectorJob *job = get_job_for_event (&list, EVENT_IN);
273 mono_threadpool_ms_enqueue_work_item (((MonoObject*) job)->vtable->domain, (MonoObject*) job);
275 if (list && (events & EVENT_OUT) != 0) {
276 MonoIOSelectorJob *job = get_job_for_event (&list, EVENT_OUT);
278 mono_threadpool_ms_enqueue_work_item (((MonoObject*) job)->vtable->domain, (MonoObject*) job);
281 remove_fd = (events & EVENT_ERR) == EVENT_ERR;
283 mono_g_hash_table_replace (states, GINT_TO_POINTER (fd), list);
285 operations = get_operations_for_jobs (list);
287 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_THREADPOOL, "io threadpool: res fd %3d, events = %2s | %2s | %3s",
288 fd, (operations & EVENT_IN) ? "RD" : "..", (operations & EVENT_OUT) ? "WR" : "..", (operations & EVENT_ERR) ? "ERR" : "...");
290 threadpool_io->backend.register_fd (fd, operations, FALSE);
292 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_THREADPOOL, "io threadpool: err fd %d", fd);
294 mono_g_hash_table_remove (states, GINT_TO_POINTER (fd));
296 threadpool_io->backend.remove_fd (fd);
302 selector_thread (gpointer data)
304 MonoGHashTable *states;
306 io_selector_running = TRUE;
308 if (mono_runtime_is_shutting_down ()) {
309 io_selector_running = FALSE;
313 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");
319 mono_coop_mutex_lock (&threadpool_io->updates_lock);
321 for (i = 0; i < threadpool_io->updates_size; ++i) {
322 ThreadPoolIOUpdate *update = &threadpool_io->updates [i];
324 switch (update->type) {
332 MonoMList *list = NULL;
333 MonoIOSelectorJob *job;
335 fd = update->data.add.fd;
338 job = update->data.add.job;
341 exists = mono_g_hash_table_lookup_extended (states, GINT_TO_POINTER (fd), &k, (gpointer*) &list);
342 list = mono_mlist_append (list, (MonoObject*) job);
343 mono_g_hash_table_replace (states, GINT_TO_POINTER (fd), list);
345 operations = get_operations_for_jobs (list);
347 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_THREADPOOL, "io threadpool: %3s fd %3d, operations = %2s | %2s | %3s",
348 exists ? "mod" : "add", fd, (operations & EVENT_IN) ? "RD" : "..", (operations & EVENT_OUT) ? "WR" : "..", (operations & EVENT_ERR) ? "ERR" : "...");
350 threadpool_io->backend.register_fd (fd, operations, !exists);
354 case UPDATE_REMOVE_SOCKET: {
357 MonoMList *list = NULL;
359 fd = update->data.remove_socket.fd;
362 if (mono_g_hash_table_lookup_extended (states, GINT_TO_POINTER (fd), &k, (gpointer*) &list)) {
363 mono_g_hash_table_remove (states, GINT_TO_POINTER (fd));
365 for (j = i + 1; j < threadpool_io->updates_size; ++j) {
366 ThreadPoolIOUpdate *update = &threadpool_io->updates [j];
367 if (update->type == UPDATE_ADD && update->data.add.fd == fd)
368 memset (update, 0, sizeof (ThreadPoolIOUpdate));
371 for (; list; list = mono_mlist_remove_item (list, list))
372 mono_threadpool_ms_enqueue_work_item (mono_object_domain (mono_mlist_get_data (list)), mono_mlist_get_data (list));
374 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_THREADPOOL, "io threadpool: del fd %3d", fd);
375 threadpool_io->backend.remove_fd (fd);
380 case UPDATE_REMOVE_DOMAIN: {
383 domain = update->data.remove_domain.domain;
386 FilterSockaresForDomainData user_data = { .domain = domain, .states = states };
387 mono_g_hash_table_foreach (states, filter_jobs_for_domain, &user_data);
389 for (j = i + 1; j < threadpool_io->updates_size; ++j) {
390 ThreadPoolIOUpdate *update = &threadpool_io->updates [j];
391 if (update->type == UPDATE_ADD && mono_object_domain (update->data.add.job) == domain)
392 memset (update, 0, sizeof (ThreadPoolIOUpdate));
398 g_assert_not_reached ();
402 mono_coop_cond_broadcast (&threadpool_io->updates_cond);
404 if (threadpool_io->updates_size > 0) {
405 threadpool_io->updates_size = 0;
406 memset (&threadpool_io->updates, 0, UPDATES_CAPACITY * sizeof (ThreadPoolIOUpdate));
409 mono_coop_mutex_unlock (&threadpool_io->updates_lock);
411 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_THREADPOOL, "io threadpool: wai");
413 res = threadpool_io->backend.event_wait (wait_callback, states);
415 if (res == -1 || mono_runtime_is_shutting_down ())
419 mono_g_hash_table_destroy (states);
421 io_selector_running = FALSE;
424 /* Locking: threadpool_io->updates_lock must be held */
425 static ThreadPoolIOUpdate*
426 update_get_new (void)
428 ThreadPoolIOUpdate *update = NULL;
429 g_assert (threadpool_io->updates_size <= UPDATES_CAPACITY);
431 while (threadpool_io->updates_size == UPDATES_CAPACITY) {
432 /* we wait for updates to be applied in the selector_thread and we loop
433 * as long as none are available. if it happends too much, then we need
434 * to increase UPDATES_CAPACITY */
435 mono_coop_cond_wait (&threadpool_io->updates_cond, &threadpool_io->updates_lock);
438 g_assert (threadpool_io->updates_size < UPDATES_CAPACITY);
440 update = &threadpool_io->updates [threadpool_io->updates_size ++];
446 wakeup_pipes_init (void)
448 #if !defined(HOST_WIN32)
449 if (pipe (threadpool_io->wakeup_pipes) == -1)
450 g_error ("wakeup_pipes_init: pipe () failed, error (%d) %s\n", errno, g_strerror (errno));
451 if (fcntl (threadpool_io->wakeup_pipes [0], F_SETFL, O_NONBLOCK) == -1)
452 g_error ("wakeup_pipes_init: fcntl () failed, error (%d) %s\n", errno, g_strerror (errno));
454 struct sockaddr_in client;
455 struct sockaddr_in server;
460 server_sock = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
461 g_assert (server_sock != INVALID_SOCKET);
462 threadpool_io->wakeup_pipes [1] = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
463 g_assert (threadpool_io->wakeup_pipes [1] != INVALID_SOCKET);
465 server.sin_family = AF_INET;
466 server.sin_addr.s_addr = inet_addr ("127.0.0.1");
468 if (bind (server_sock, (SOCKADDR*) &server, sizeof (server)) == SOCKET_ERROR) {
469 closesocket (server_sock);
470 g_error ("wakeup_pipes_init: bind () failed, error (%d)\n", WSAGetLastError ());
473 size = sizeof (server);
474 if (getsockname (server_sock, (SOCKADDR*) &server, &size) == SOCKET_ERROR) {
475 closesocket (server_sock);
476 g_error ("wakeup_pipes_init: getsockname () failed, error (%d)\n", WSAGetLastError ());
478 if (listen (server_sock, 1024) == SOCKET_ERROR) {
479 closesocket (server_sock);
480 g_error ("wakeup_pipes_init: listen () failed, error (%d)\n", WSAGetLastError ());
482 if (connect ((SOCKET) threadpool_io->wakeup_pipes [1], (SOCKADDR*) &server, sizeof (server)) == SOCKET_ERROR) {
483 closesocket (server_sock);
484 g_error ("wakeup_pipes_init: connect () failed, error (%d)\n", WSAGetLastError ());
487 size = sizeof (client);
488 threadpool_io->wakeup_pipes [0] = accept (server_sock, (SOCKADDR *) &client, &size);
489 g_assert (threadpool_io->wakeup_pipes [0] != INVALID_SOCKET);
492 if (ioctlsocket (threadpool_io->wakeup_pipes [0], FIONBIO, &arg) == SOCKET_ERROR) {
493 closesocket (threadpool_io->wakeup_pipes [0]);
494 closesocket (server_sock);
495 g_error ("wakeup_pipes_init: ioctlsocket () failed, error (%d)\n", WSAGetLastError ());
498 closesocket (server_sock);
505 g_assert (!threadpool_io);
506 threadpool_io = g_new0 (ThreadPoolIO, 1);
507 g_assert (threadpool_io);
509 mono_coop_mutex_init (&threadpool_io->updates_lock);
510 mono_coop_cond_init (&threadpool_io->updates_cond);
511 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");
513 threadpool_io->updates_size = 0;
515 threadpool_io->backend = backend_poll;
516 if (g_getenv ("MONO_ENABLE_AIO") != NULL) {
517 #if defined(HAVE_EPOLL)
518 threadpool_io->backend = backend_epoll;
519 #elif defined(HAVE_KQUEUE)
520 threadpool_io->backend = backend_kqueue;
524 wakeup_pipes_init ();
526 if (!threadpool_io->backend.init (threadpool_io->wakeup_pipes [0]))
527 g_error ("initialize: backend->init () failed");
529 if (!mono_thread_create_internal (mono_get_root_domain (), selector_thread, NULL, TRUE, SMALL_STACK))
530 g_error ("initialize: mono_thread_create_internal () failed");
536 /* we make the assumption along the code that we are
537 * cleaning up only if the runtime is shutting down */
538 g_assert (mono_runtime_is_shutting_down ());
540 selector_thread_wakeup ();
541 while (io_selector_running)
544 mono_coop_mutex_destroy (&threadpool_io->updates_lock);
545 mono_coop_cond_destroy (&threadpool_io->updates_cond);
547 threadpool_io->backend.cleanup ();
549 #if !defined(HOST_WIN32)
550 close (threadpool_io->wakeup_pipes [0]);
551 close (threadpool_io->wakeup_pipes [1]);
553 closesocket (threadpool_io->wakeup_pipes [0]);
554 closesocket (threadpool_io->wakeup_pipes [1]);
557 g_assert (threadpool_io);
558 g_free (threadpool_io);
559 threadpool_io = NULL;
560 g_assert (!threadpool_io);
564 mono_threadpool_ms_io_cleanup (void)
566 mono_lazy_cleanup (&io_status, cleanup);
570 ves_icall_System_IOSelector_Add (gpointer handle, MonoIOSelectorJob *job)
572 ThreadPoolIOUpdate *update;
574 g_assert (handle >= 0);
576 g_assert (job->operation == EVENT_IN ^ job->operation == EVENT_OUT);
577 g_assert (job->callback);
579 if (mono_runtime_is_shutting_down ())
581 if (mono_domain_is_unloading (mono_object_domain (job)))
584 mono_lazy_initialize (&io_status, initialize);
586 mono_coop_mutex_lock (&threadpool_io->updates_lock);
588 update = update_get_new ();
589 update->type = UPDATE_ADD;
590 update->data.add.fd = GPOINTER_TO_INT (handle);
591 update->data.add.job = job;
592 mono_memory_barrier (); /* Ensure this is safely published before we wake up the selector */
594 selector_thread_wakeup ();
596 mono_coop_mutex_unlock (&threadpool_io->updates_lock);
600 ves_icall_System_IOSelector_Remove (gpointer handle)
602 mono_threadpool_ms_io_remove_socket (GPOINTER_TO_INT (handle));
606 mono_threadpool_ms_io_remove_socket (int fd)
608 ThreadPoolIOUpdate *update;
610 if (!mono_lazy_is_initialized (&io_status))
613 mono_coop_mutex_lock (&threadpool_io->updates_lock);
615 update = update_get_new ();
616 update->type = UPDATE_REMOVE_SOCKET;
617 update->data.add.fd = fd;
618 mono_memory_barrier (); /* Ensure this is safely published before we wake up the selector */
620 selector_thread_wakeup ();
622 mono_coop_cond_wait (&threadpool_io->updates_cond, &threadpool_io->updates_lock);
624 mono_coop_mutex_unlock (&threadpool_io->updates_lock);
628 mono_threadpool_ms_io_remove_domain_jobs (MonoDomain *domain)
630 ThreadPoolIOUpdate *update;
632 if (!mono_lazy_is_initialized (&io_status))
635 mono_coop_mutex_lock (&threadpool_io->updates_lock);
637 update = update_get_new ();
638 update->type = UPDATE_REMOVE_DOMAIN;
639 update->data.remove_domain.domain = domain;
640 mono_memory_barrier (); /* Ensure this is safely published before we wake up the selector */
642 selector_thread_wakeup ();
644 mono_coop_cond_wait (&threadpool_io->updates_cond, &threadpool_io->updates_lock);
646 mono_coop_mutex_unlock (&threadpool_io->updates_lock);
652 ves_icall_System_IOSelector_Add (gpointer handle, MonoIOSelectorJob *job)
654 g_assert_not_reached ();
658 ves_icall_System_IOSelector_Remove (gpointer handle)
660 g_assert_not_reached ();
664 mono_threadpool_ms_io_cleanup (void)
666 g_assert_not_reached ();
670 mono_threadpool_ms_io_remove_socket (int fd)
672 g_assert_not_reached ();
676 mono_threadpool_ms_io_remove_domain_jobs (MonoDomain *domain)
678 g_assert_not_reached ();