2 * threadpool.c: global thread pool
5 * Dietmar Maurer (dietmar@ximian.com)
6 * Gonzalo Paniagua Javier (gonzalo@ximian.com)
8 * Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
9 * Copyright 2004-2010 Novell, Inc (http://www.novell.com)
10 * Copyright 2001 Xamarin Inc (http://www.xamarin.com)
16 #include <mono/metadata/profiler-private.h>
17 #include <mono/metadata/threads.h>
18 #include <mono/metadata/threads-types.h>
19 #include <mono/metadata/threadpool-internals.h>
20 #include <mono/metadata/exception.h>
21 #include <mono/metadata/environment.h>
22 #include <mono/metadata/mono-mlist.h>
23 #include <mono/metadata/mono-perfcounters.h>
24 #include <mono/metadata/socket-io.h>
25 #include <mono/metadata/mono-cq.h>
26 #include <mono/metadata/mono-wsq.h>
27 #include <mono/metadata/mono-ptr-array.h>
28 #include <mono/io-layer/io-layer.h>
29 #include <mono/utils/mono-time.h>
30 #include <mono/utils/mono-proclib.h>
31 #include <mono/utils/mono-semaphore.h>
33 #ifdef HAVE_SYS_TIME_H
36 #include <sys/types.h>
42 #ifdef HAVE_SYS_SOCKET_H
43 #include <sys/socket.h>
45 #include <mono/utils/mono-poll.h>
47 #include <sys/epoll.h>
50 #include <sys/event.h>
54 #ifndef DISABLE_SOCKETS
55 #include "mono/io-layer/socket-wrappers.h"
58 #include "threadpool.h"
60 #define THREAD_WANTS_A_BREAK(t) ((t->state & (ThreadState_StopRequested | \
61 ThreadState_SuspendRequested)) != 0)
63 #define SPIN_TRYLOCK(i) (InterlockedCompareExchange (&(i), 1, 0) == 0)
64 #define SPIN_LOCK(i) do { \
65 if (SPIN_TRYLOCK (i)) \
69 #define SPIN_UNLOCK(i) i = 0
70 #define SMALL_STACK (128 * (sizeof (gpointer) / 4) * 1024)
72 /* DEBUG: prints tp data every 2s */
75 /* mono_thread_pool_init called */
76 static volatile int tp_inited;
85 CRITICAL_SECTION io_lock; /* access to sock_to_state */
86 int inited; // 0 -> not initialized , 1->initializing, 2->initialized, 3->cleaned up
87 MonoGHashTable *sock_to_state;
91 void (*modify) (gpointer event_data, int fd, int operation, int events, gboolean is_new);
92 void (*wait) (gpointer sock_data);
93 void (*shutdown) (gpointer event_data);
96 static SocketIOData socket_io_data;
98 /* Keep in sync with the System.MonoAsyncCall class which provides GC tracking */
101 MonoMethodMessage *msg;
102 MonoMethod *cb_method;
103 MonoDelegate *cb_target;
111 MonoCQ *queue; /* GC root */
113 volatile gint waiting; /* threads waiting for a work item */
116 volatile gint pool_status; /* 0 -> not initialized, 1 -> initialized, 2 -> cleaning up */
117 /* min, max, n and busy -> Interlocked */
118 volatile gint min_threads;
119 volatile gint max_threads;
120 volatile gint nthreads;
121 volatile gint busy_threads;
123 void (*async_invoke) (gpointer data);
124 void *pc_nitems; /* Performance counter for total number of items in added */
125 void *pc_nthreads; /* Performance counter for total number of active threads */
127 volatile gint destroy_thread;
128 volatile gint ignore_times; /* Used when there's a thread being created or destroyed */
129 volatile gint sp_lock; /* spin lock used to protect ignore_times */
130 volatile gint64 last_check;
131 volatile gint64 time_sum;
137 static ThreadPool async_tp;
138 static ThreadPool async_io_tp;
140 static void async_invoke_thread (gpointer data);
141 static MonoObject *mono_async_invoke (ThreadPool *tp, MonoAsyncResult *ares);
142 static void threadpool_free_queue (ThreadPool *tp);
143 static void threadpool_append_job (ThreadPool *tp, MonoObject *ar);
144 static void threadpool_append_jobs (ThreadPool *tp, MonoObject **jobs, gint njobs);
145 static void threadpool_init (ThreadPool *tp, int min_threads, int max_threads, void (*async_invoke) (gpointer));
146 static void threadpool_start_idle_threads (ThreadPool *tp);
147 static void threadpool_kill_idle_threads (ThreadPool *tp);
148 static gboolean threadpool_start_thread (ThreadPool *tp);
149 static void monitor_thread (gpointer data);
150 static void socket_io_cleanup (SocketIOData *data);
151 static MonoObject *get_io_event (MonoMList **list, gint event);
152 static int get_events_from_list (MonoMList *list);
153 static int get_event_from_state (MonoSocketAsyncResult *state);
155 static MonoClass *async_call_klass;
156 static MonoClass *socket_async_call_klass;
157 static MonoClass *process_async_call_klass;
159 static GPtrArray *wsqs;
160 CRITICAL_SECTION wsqs_lock;
163 static MonoThreadPoolFunc tp_start_func;
164 static MonoThreadPoolFunc tp_finish_func;
165 static gpointer tp_hooks_user_data;
166 static MonoThreadPoolItemFunc tp_item_begin_func;
167 static MonoThreadPoolItemFunc tp_item_end_func;
168 static gpointer tp_item_user_data;
178 AIO_OP_RECV_JUST_CALLBACK,
179 AIO_OP_SEND_JUST_CALLBACK,
183 AIO_OP_ACCEPTRECEIVE,
184 AIO_OP_RECEIVE_BUFFERS,
189 #include <mono/metadata/tpool-poll.c>
191 #include <mono/metadata/tpool-epoll.c>
192 #elif defined(HAVE_KQUEUE)
193 #include <mono/metadata/tpool-kqueue.c>
196 * Functions to check whenever a class is given system class. We need to cache things in MonoDomain since some of the
197 * assemblies can be unloaded.
201 is_system_type (MonoDomain *domain, MonoClass *klass)
203 if (domain->system_image == NULL)
204 domain->system_image = mono_image_loaded ("System");
206 return klass->image == domain->system_image;
210 is_corlib_type (MonoDomain *domain, MonoClass *klass)
212 return klass->image == mono_defaults.corlib;
216 * Note that we call it is_socket_type() where 'socket' refers to the image
217 * that contains the System.Net.Sockets.Socket type.
218 * For moonlight there is a System.Net.Sockets.Socket class in both System.dll and System.Net.dll.
221 is_socket_type (MonoDomain *domain, MonoClass *klass)
223 static const char *version = NULL;
224 static gboolean moonlight;
226 if (is_system_type (domain, klass))
229 /* If moonlight, check if the type is in System.Net.dll too */
230 if (version == NULL) {
231 version = mono_get_runtime_info ()->framework_version;
232 moonlight = !strcmp (version, "2.1");
238 if (domain->system_net_dll == NULL)
239 domain->system_net_dll = mono_image_loaded ("System.Net");
241 return klass->image == domain->system_net_dll;
244 #define check_type_cached(domain, ASSEMBLY, _class, _namespace, _name, loc) do { \
246 return *loc == _class; \
247 if (is_##ASSEMBLY##_type (domain, _class) && !strcmp (_name, _class->name) && !strcmp (_namespace, _class->name_space)) { \
254 #define check_corlib_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, corlib, _class, _namespace, _name, loc)
256 #define check_socket_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, socket, _class, _namespace, _name, loc)
258 #define check_system_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, system, _class, _namespace, _name, loc)
261 is_corlib_asyncresult (MonoDomain *domain, MonoClass *klass)
263 check_corlib_type_cached (domain, klass, "System.Runtime.Remoting.Messaging", "AsyncResult", &domain->corlib_asyncresult_class);
267 is_socket (MonoDomain *domain, MonoClass *klass)
269 check_socket_type_cached (domain, klass, "System.Net.Sockets", "Socket", &domain->socket_class);
273 is_socketasyncresult (MonoDomain *domain, MonoClass *klass)
275 return (klass->nested_in &&
276 is_socket (domain, klass->nested_in) &&
277 !strcmp (klass->name, "SocketAsyncResult"));
281 is_socketasynccall (MonoDomain *domain, MonoClass *klass)
283 return (klass->nested_in &&
284 is_socket (domain, klass->nested_in) &&
285 !strcmp (klass->name, "SocketAsyncCall"));
289 is_appdomainunloaded_exception (MonoDomain *domain, MonoClass *klass)
291 check_corlib_type_cached (domain, klass, "System", "AppDomainUnloadedException", &domain->ad_unloaded_ex_class);
295 is_sd_process (MonoDomain *domain, MonoClass *klass)
297 check_system_type_cached (domain, klass, "System.Diagnostics", "Process", &domain->process_class);
301 is_sdp_asyncreadhandler (MonoDomain *domain, MonoClass *klass)
304 return (klass->nested_in &&
305 is_sd_process (domain, klass->nested_in) &&
306 !strcmp (klass->name, "AsyncReadHandler"));
310 #ifdef DISABLE_SOCKETS
312 #define socket_io_cleanup(x)
315 get_event_from_state (MonoSocketAsyncResult *state)
317 g_assert_not_reached ();
322 get_events_from_list (MonoMList *list)
330 socket_io_cleanup (SocketIOData *data)
332 EnterCriticalSection (&data->io_lock);
333 if (data->inited != 2) {
334 LeaveCriticalSection (&data->io_lock);
338 data->shutdown (data->event_data);
339 LeaveCriticalSection (&data->io_lock);
343 get_event_from_state (MonoSocketAsyncResult *state)
345 switch (state->operation) {
348 case AIO_OP_RECV_JUST_CALLBACK:
349 case AIO_OP_RECEIVEFROM:
350 case AIO_OP_READPIPE:
351 case AIO_OP_ACCEPTRECEIVE:
352 case AIO_OP_RECEIVE_BUFFERS:
355 case AIO_OP_SEND_JUST_CALLBACK:
358 case AIO_OP_SEND_BUFFERS:
359 case AIO_OP_DISCONNECT:
361 default: /* Should never happen */
362 g_message ("get_event_from_state: unknown value in switch!!!");
368 get_events_from_list (MonoMList *list)
370 MonoSocketAsyncResult *state;
373 while (list && (state = (MonoSocketAsyncResult *)mono_mlist_get_data (list))) {
374 events |= get_event_from_state (state);
375 list = mono_mlist_next (list);
381 #define ICALL_RECV(x) ves_icall_System_Net_Sockets_Socket_Receive_internal (\
382 (SOCKET)(gssize)x->handle, x->buffer, x->offset, x->size,\
383 x->socket_flags, &x->error);
385 #define ICALL_SEND(x) ves_icall_System_Net_Sockets_Socket_Send_internal (\
386 (SOCKET)(gssize)x->handle, x->buffer, x->offset, x->size,\
387 x->socket_flags, &x->error);
389 #endif /* !DISABLE_SOCKETS */
392 threadpool_jobs_inc (MonoObject *obj)
395 InterlockedIncrement (&obj->vtable->domain->threadpool_jobs);
399 threadpool_jobs_dec (MonoObject *obj)
407 domain = obj->vtable->domain;
408 remaining_jobs = InterlockedDecrement (&domain->threadpool_jobs);
409 if (remaining_jobs == 0 && domain->cleanup_semaphore) {
410 ReleaseSemaphore (domain->cleanup_semaphore, 1, NULL);
417 get_io_event (MonoMList **list, gint event)
427 state = mono_mlist_get_data (current);
428 if (get_event_from_state ((MonoSocketAsyncResult *) state) == event)
433 current = mono_mlist_next (current);
438 mono_mlist_set_next (prev, mono_mlist_next (current));
440 *list = mono_mlist_next (*list);
448 * select/poll wake up when a socket is closed, but epoll just removes
449 * the socket from its internal list without notification.
452 mono_thread_pool_remove_socket (int sock)
455 MonoSocketAsyncResult *state;
458 if (socket_io_data.inited == 0)
461 EnterCriticalSection (&socket_io_data.io_lock);
462 if (socket_io_data.sock_to_state == NULL) {
463 LeaveCriticalSection (&socket_io_data.io_lock);
466 list = mono_g_hash_table_lookup (socket_io_data.sock_to_state, GINT_TO_POINTER (sock));
468 mono_g_hash_table_remove (socket_io_data.sock_to_state, GINT_TO_POINTER (sock));
469 LeaveCriticalSection (&socket_io_data.io_lock);
472 state = (MonoSocketAsyncResult *) mono_mlist_get_data (list);
473 if (state->operation == AIO_OP_RECEIVE)
474 state->operation = AIO_OP_RECV_JUST_CALLBACK;
475 else if (state->operation == AIO_OP_SEND)
476 state->operation = AIO_OP_SEND_JUST_CALLBACK;
478 ares = get_io_event (&list, MONO_POLLIN);
479 threadpool_append_job (&async_io_tp, ares);
481 ares = get_io_event (&list, MONO_POLLOUT);
482 threadpool_append_job (&async_io_tp, ares);
488 init_event_system (SocketIOData *data)
491 if (data->event_system == EPOLL_BACKEND) {
492 data->event_data = tp_epoll_init (data);
493 if (data->event_data == NULL) {
494 if (g_getenv ("MONO_DEBUG"))
495 g_message ("Falling back to poll()");
496 data->event_system = POLL_BACKEND;
499 #elif defined(HAVE_KQUEUE)
500 if (data->event_system == KQUEUE_BACKEND)
501 data->event_data = tp_kqueue_init (data);
503 if (data->event_system == POLL_BACKEND)
504 data->event_data = tp_poll_init (data);
508 socket_io_init (SocketIOData *data)
512 if (data->inited >= 2) // 2 -> initialized, 3-> cleaned up
515 inited = InterlockedCompareExchange (&data->inited, 1, 0);
518 if (data->inited >= 2)
524 EnterCriticalSection (&data->io_lock);
525 data->sock_to_state = mono_g_hash_table_new_type (g_direct_hash, g_direct_equal, MONO_HASH_VALUE_GC);
527 data->event_system = EPOLL_BACKEND;
528 #elif defined(HAVE_KQUEUE)
529 data->event_system = KQUEUE_BACKEND;
531 data->event_system = POLL_BACKEND;
533 if (g_getenv ("MONO_DISABLE_AIO") != NULL)
534 data->event_system = POLL_BACKEND;
536 init_event_system (data);
537 mono_thread_create_internal (mono_get_root_domain (), data->wait, data, TRUE, SMALL_STACK);
538 LeaveCriticalSection (&data->io_lock);
540 threadpool_start_thread (&async_io_tp);
544 socket_io_add (MonoAsyncResult *ares, MonoSocketAsyncResult *state)
547 SocketIOData *data = &socket_io_data;
552 socket_io_init (&socket_io_data);
553 if (mono_runtime_is_shutting_down () || data->inited == 3 || data->sock_to_state == NULL)
555 if (async_tp.pool_status == 2)
558 MONO_OBJECT_SETREF (state, ares, ares);
560 fd = GPOINTER_TO_INT (state->handle);
561 EnterCriticalSection (&data->io_lock);
562 if (data->sock_to_state == NULL) {
563 LeaveCriticalSection (&data->io_lock);
566 list = mono_g_hash_table_lookup (data->sock_to_state, GINT_TO_POINTER (fd));
568 list = mono_mlist_alloc ((MonoObject*)state);
571 list = mono_mlist_append (list, (MonoObject*)state);
575 mono_g_hash_table_replace (data->sock_to_state, state->handle, list);
576 ievt = get_events_from_list (list);
577 LeaveCriticalSection (&data->io_lock);
578 data->modify (data->event_data, fd, state->operation, ievt, is_new);
581 #ifndef DISABLE_SOCKETS
583 socket_io_filter (MonoObject *target, MonoObject *state)
586 MonoSocketAsyncResult *sock_res;
590 if (target == NULL || state == NULL)
593 domain = target->vtable->domain;
594 klass = target->vtable->klass;
595 if (socket_async_call_klass == NULL && is_socketasynccall (domain, klass))
596 socket_async_call_klass = klass;
598 if (process_async_call_klass == NULL && is_sdp_asyncreadhandler (domain, klass))
599 process_async_call_klass = klass;
601 if (klass != socket_async_call_klass && klass != process_async_call_klass)
604 sock_res = (MonoSocketAsyncResult *) state;
605 op = sock_res->operation;
606 if (op < AIO_OP_FIRST || op >= AIO_OP_LAST)
611 #endif /* !DISABLE_SOCKETS */
613 /* Returns the exception thrown when invoking, if any */
615 mono_async_invoke (ThreadPool *tp, MonoAsyncResult *ares)
617 ASyncCall *ac = (ASyncCall *)ares->object_data;
618 MonoObject *res, *exc = NULL;
619 MonoArray *out_args = NULL;
620 HANDLE wait_event = NULL;
622 if (ares->execution_context) {
623 /* use captured ExecutionContext (if available) */
624 MONO_OBJECT_SETREF (ares, original_context, mono_thread_get_execution_context ());
625 mono_thread_set_execution_context (ares->execution_context);
627 ares->original_context = NULL;
631 /* Fast path from ThreadPool.*QueueUserWorkItem */
632 void *pa = ares->async_state;
633 mono_runtime_delegate_invoke (ares->async_delegate, &pa, &exc);
635 MonoObject *cb_exc = NULL;
638 res = mono_message_invoke (ares->async_delegate, ac->msg, &exc, &out_args);
639 MONO_OBJECT_SETREF (ac, res, res);
640 MONO_OBJECT_SETREF (ac, msg->exc, exc);
641 MONO_OBJECT_SETREF (ac, out_args, out_args);
643 mono_monitor_enter ((MonoObject *) ares);
645 if (ares->handle != NULL)
646 wait_event = mono_wait_handle_get_handle ((MonoWaitHandle *) ares->handle);
647 mono_monitor_exit ((MonoObject *) ares);
648 /* notify listeners */
649 if (wait_event != NULL)
650 SetEvent (wait_event);
652 /* call async callback if cb_method != null*/
653 if (ac != NULL && ac->cb_method) {
656 mono_runtime_invoke (ac->cb_method, ac->cb_target, pa, &cb_exc);
657 MONO_OBJECT_SETREF (ac->msg, exc, cb_exc);
664 /* restore original thread execution context if flow isn't suppressed, i.e. non null */
665 if (ares->original_context) {
666 mono_thread_set_execution_context (ares->original_context);
667 ares->original_context = NULL;
673 threadpool_start_idle_threads (ThreadPool *tp)
678 stack_size = (!tp->is_io) ? 0 : SMALL_STACK;
682 if (n >= tp->min_threads)
684 if (InterlockedCompareExchange (&tp->nthreads, n + 1, n) == n)
687 mono_perfcounter_update_value (tp->pc_nthreads, TRUE, 1);
688 mono_thread_create_internal (mono_get_root_domain (), tp->async_invoke, tp, TRUE, stack_size);
694 threadpool_init (ThreadPool *tp, int min_threads, int max_threads, void (*async_invoke) (gpointer))
696 memset (tp, 0, sizeof (ThreadPool));
697 tp->min_threads = min_threads;
698 tp->max_threads = max_threads;
699 tp->async_invoke = async_invoke;
700 tp->queue = mono_cq_create ();
701 MONO_SEM_INIT (&tp->new_job, 0);
705 init_perf_counter (const char *category, const char *counter)
707 MonoString *category_str;
708 MonoString *counter_str;
714 if (category == NULL || counter == NULL)
716 root = mono_get_root_domain ();
717 category_str = mono_string_new (root, category);
718 counter_str = mono_string_new (root, counter);
719 machine = mono_string_new (root, ".");
720 return mono_perfcounter_get_impl (category_str, counter_str, NULL, machine, &type, &custom);
725 print_pool_info (ThreadPool *tp)
728 // if (tp->tail - tp->head == 0)
731 g_print ("Pool status? %d\n", InterlockedCompareExchange (&tp->pool_status, 0, 0));
732 g_print ("Min. threads: %d\n", InterlockedCompareExchange (&tp->min_threads, 0, 0));
733 g_print ("Max. threads: %d\n", InterlockedCompareExchange (&tp->max_threads, 0, 0));
734 g_print ("nthreads: %d\n", InterlockedCompareExchange (&tp->nthreads, 0, 0));
735 g_print ("busy threads: %d\n", InterlockedCompareExchange (&tp->busy_threads, 0, 0));
736 g_print ("Waiting: %d\n", InterlockedCompareExchange (&tp->waiting, 0, 0));
737 g_print ("Queued: %d\n", (tp->tail - tp->head));
738 if (tp == &async_tp) {
740 EnterCriticalSection (&wsqs_lock);
741 for (i = 0; i < wsqs->len; i++) {
742 g_print ("\tWSQ %d: %d\n", i, mono_wsq_count (g_ptr_array_index (wsqs, i)));
744 LeaveCriticalSection (&wsqs_lock);
746 g_print ("\tSockets: %d\n", mono_g_hash_table_size (socket_io_data.sock_to_state));
748 g_print ("-------------\n");
752 signal_handler (int signo)
757 g_print ("\n-----Non-IO-----\n");
758 print_pool_info (tp);
760 g_print ("\n-----IO-----\n");
761 print_pool_info (tp);
767 monitor_thread (gpointer unused)
769 ThreadPool *pools [2];
770 MonoInternalThread *thread;
775 pools [0] = &async_tp;
776 pools [1] = &async_io_tp;
777 thread = mono_thread_internal_current ();
778 ves_icall_System_Threading_Thread_SetName_internal (thread, mono_string_new (mono_domain_get (), "Threadpool monitor"));
783 ts = mono_msec_ticks ();
784 if (SleepEx (ms, TRUE) == 0)
786 ms -= (mono_msec_ticks () - ts);
787 if (mono_runtime_is_shutting_down ())
789 if (THREAD_WANTS_A_BREAK (thread))
790 mono_thread_interruption_checkpoint ();
793 if (mono_runtime_is_shutting_down ())
796 for (i = 0; i < 2; i++) {
801 need_one = (mono_cq_count (tp->queue) > 0);
802 if (!need_one && !tp->is_io) {
803 EnterCriticalSection (&wsqs_lock);
804 for (i = 0; wsqs != NULL && i < wsqs->len; i++) {
806 wsq = g_ptr_array_index (wsqs, i);
807 if (mono_wsq_count (wsq) != 0) {
812 LeaveCriticalSection (&wsqs_lock);
815 threadpool_start_thread (tp);
821 mono_thread_pool_init ()
823 gint threads_per_cpu = 1;
825 gint cpu_count = mono_cpu_count ();
831 result = InterlockedCompareExchange (&tp_inited, 1, 0);
840 MONO_GC_REGISTER_ROOT_FIXED (socket_io_data.sock_to_state);
841 InitializeCriticalSection (&socket_io_data.io_lock);
842 if (g_getenv ("MONO_THREADS_PER_CPU") != NULL) {
843 threads_per_cpu = atoi (g_getenv ("MONO_THREADS_PER_CPU"));
844 if (threads_per_cpu < 1)
848 thread_count = MIN (cpu_count * threads_per_cpu, 100 * cpu_count);
849 threadpool_init (&async_tp, thread_count, MAX (100 * cpu_count, thread_count), async_invoke_thread);
850 threadpool_init (&async_io_tp, cpu_count * 2, cpu_count * 4, async_invoke_thread);
851 async_io_tp.is_io = TRUE;
853 async_call_klass = mono_class_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
854 g_assert (async_call_klass);
856 InitializeCriticalSection (&wsqs_lock);
857 wsqs = g_ptr_array_sized_new (MAX (100 * cpu_count, thread_count));
860 async_tp.pc_nitems = init_perf_counter ("Mono Threadpool", "Work Items Added");
861 g_assert (async_tp.pc_nitems);
863 async_io_tp.pc_nitems = init_perf_counter ("Mono Threadpool", "IO Work Items Added");
864 g_assert (async_io_tp.pc_nitems);
866 async_tp.pc_nthreads = init_perf_counter ("Mono Threadpool", "# of Threads");
867 g_assert (async_tp.pc_nthreads);
869 async_io_tp.pc_nthreads = init_perf_counter ("Mono Threadpool", "# of IO Threads");
870 g_assert (async_io_tp.pc_nthreads);
873 signal (SIGALRM, signal_handler);
878 static MonoAsyncResult *
879 create_simple_asyncresult (MonoObject *target, MonoObject *state)
881 MonoDomain *domain = mono_domain_get ();
882 MonoAsyncResult *ares;
884 /* Don't call mono_async_result_new() to avoid capturing the context */
885 ares = (MonoAsyncResult *) mono_object_new (domain, mono_defaults.asyncresult_class);
886 MONO_OBJECT_SETREF (ares, async_delegate, target);
887 MONO_OBJECT_SETREF (ares, async_state, state);
892 icall_append_io_job (MonoObject *target, MonoSocketAsyncResult *state)
894 MonoAsyncResult *ares;
896 ares = create_simple_asyncresult (target, (MonoObject *) state);
897 socket_io_add (ares, state);
901 mono_thread_pool_add (MonoObject *target, MonoMethodMessage *msg, MonoDelegate *async_callback,
904 MonoDomain *domain = mono_domain_get ();
905 MonoAsyncResult *ares;
908 ac = (ASyncCall*)mono_object_new (domain, async_call_klass);
909 MONO_OBJECT_SETREF (ac, msg, msg);
910 MONO_OBJECT_SETREF (ac, state, state);
912 if (async_callback) {
913 ac->cb_method = mono_get_delegate_invoke (((MonoObject *)async_callback)->vtable->klass);
914 MONO_OBJECT_SETREF (ac, cb_target, async_callback);
917 ares = mono_async_result_new (domain, NULL, ac->state, NULL, (MonoObject*)ac);
918 MONO_OBJECT_SETREF (ares, async_delegate, target);
920 #ifndef DISABLE_SOCKETS
921 if (socket_io_filter (target, state)) {
922 socket_io_add (ares, (MonoSocketAsyncResult *) state);
926 threadpool_append_job (&async_tp, (MonoObject *) ares);
931 mono_thread_pool_finish (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc)
939 /* check if already finished */
940 mono_monitor_enter ((MonoObject *) ares);
942 if (ares->endinvoke_called) {
943 *exc = (MonoObject *) mono_get_exception_invalid_operation (NULL);
944 mono_monitor_exit ((MonoObject *) ares);
948 ares->endinvoke_called = 1;
949 /* wait until we are really finished */
950 if (!ares->completed) {
951 if (ares->handle == NULL) {
952 wait_event = CreateEvent (NULL, TRUE, FALSE, NULL);
953 g_assert(wait_event != 0);
954 MONO_OBJECT_SETREF (ares, handle, (MonoObject *) mono_wait_handle_new (mono_object_domain (ares), wait_event));
956 wait_event = mono_wait_handle_get_handle ((MonoWaitHandle *) ares->handle);
958 mono_monitor_exit ((MonoObject *) ares);
959 WaitForSingleObjectEx (wait_event, INFINITE, TRUE);
961 mono_monitor_exit ((MonoObject *) ares);
964 ac = (ASyncCall *) ares->object_data;
965 g_assert (ac != NULL);
966 *exc = ac->msg->exc; /* FIXME: GC add write barrier */
967 *out_args = ac->out_args;
973 threadpool_kill_idle_threads (ThreadPool *tp)
977 n = (gint) InterlockedCompareExchange (&tp->max_threads, 0, -1);
980 MONO_SEM_POST (&tp->new_job);
985 mono_thread_pool_cleanup (void)
987 if (InterlockedExchange (&async_io_tp.pool_status, 2) == 1) {
988 socket_io_cleanup (&socket_io_data); /* Empty when DISABLE_SOCKETS is defined */
989 threadpool_kill_idle_threads (&async_io_tp);
992 if (async_io_tp.queue != NULL) {
993 MONO_SEM_DESTROY (&async_io_tp.new_job);
994 threadpool_free_queue (&async_io_tp);
998 if (InterlockedExchange (&async_tp.pool_status, 2) == 1) {
999 threadpool_kill_idle_threads (&async_tp);
1000 threadpool_free_queue (&async_tp);
1004 EnterCriticalSection (&wsqs_lock);
1005 mono_wsq_cleanup ();
1007 g_ptr_array_free (wsqs, TRUE);
1009 LeaveCriticalSection (&wsqs_lock);
1010 MONO_SEM_DESTROY (&async_tp.new_job);
1015 threadpool_start_thread (ThreadPool *tp)
1020 stack_size = (!tp->is_io) ? 0 : SMALL_STACK;
1021 while (!mono_runtime_is_shutting_down () && (n = tp->nthreads) < tp->max_threads) {
1022 if (InterlockedCompareExchange (&tp->nthreads, n + 1, n) == n) {
1023 mono_perfcounter_update_value (tp->pc_nthreads, TRUE, 1);
1024 mono_thread_create_internal (mono_get_root_domain (), tp->async_invoke, tp, TRUE, stack_size);
1033 pulse_on_new_job (ThreadPool *tp)
1036 MONO_SEM_POST (&tp->new_job);
1040 icall_append_job (MonoObject *ar)
1042 threadpool_append_jobs (&async_tp, &ar, 1);
1046 threadpool_append_job (ThreadPool *tp, MonoObject *ar)
1048 threadpool_append_jobs (tp, &ar, 1);
1052 threadpool_append_jobs (ThreadPool *tp, MonoObject **jobs, gint njobs)
1054 static int job_counter;
1058 if (mono_runtime_is_shutting_down ())
1061 if (tp->pool_status == 0 && InterlockedCompareExchange (&tp->pool_status, 1, 0) == 0) {
1063 mono_thread_create_internal (mono_get_root_domain (), monitor_thread, NULL, TRUE, SMALL_STACK);
1064 threadpool_start_thread (tp);
1066 /* Create on demand up to min_threads to avoid startup penalty for apps that don't use
1067 * the threadpool that much
1068 * mono_thread_create_internal (mono_get_root_domain (), threadpool_start_idle_threads, tp, TRUE, SMALL_STACK);
1072 for (i = 0; i < njobs; i++) {
1074 if (ar == NULL || mono_domain_is_unloading (ar->vtable->domain))
1075 continue; /* Might happen when cleaning domain jobs */
1076 if (!tp->is_io && (InterlockedIncrement (&job_counter) % 10) == 0) {
1077 MonoAsyncResult *o = (MonoAsyncResult *) ar;
1078 o->add_time = mono_100ns_ticks ();
1080 threadpool_jobs_inc (ar);
1081 mono_perfcounter_update_value (tp->pc_nitems, TRUE, 1);
1082 if (!tp->is_io && mono_wsq_local_push (ar))
1085 mono_cq_enqueue (tp->queue, ar);
1088 for (i = 0; tp->waiting > 0 && i < MIN(njobs, tp->max_threads); i++)
1089 pulse_on_new_job (tp);
1093 threadpool_clear_queue (ThreadPool *tp, MonoDomain *domain)
1099 while (mono_cq_dequeue (tp->queue, &obj)) {
1102 if (obj->vtable->domain != domain)
1103 other = mono_mlist_prepend (other, obj);
1104 threadpool_jobs_dec (obj);
1108 threadpool_append_job (tp, (MonoObject *) mono_mlist_get_data (other));
1109 other = mono_mlist_next (other);
1114 * Clean up the threadpool of all domain jobs.
1115 * Can only be called as part of the domain unloading process as
1116 * it will wait for all jobs to be visible to the interruption code.
1119 mono_thread_pool_remove_domain_jobs (MonoDomain *domain, int timeout)
1123 guint32 start_time = 0;
1125 g_assert (domain->state == MONO_APPDOMAIN_UNLOADING);
1127 threadpool_clear_queue (&async_tp, domain);
1128 threadpool_clear_queue (&async_io_tp, domain);
1131 * There might be some threads out that could be about to execute stuff from the given domain.
1132 * We avoid that by setting up a semaphore to be pulsed by the thread that reaches zero.
1134 sem_handle = CreateSemaphore (NULL, 0, 1, NULL);
1136 domain->cleanup_semaphore = sem_handle;
1138 * The memory barrier here is required to have global ordering between assigning to cleanup_semaphone
1139 * and reading threadpool_jobs.
1140 * Otherwise this thread could read a stale version of threadpool_jobs and wait forever.
1142 mono_memory_write_barrier ();
1144 if (domain->threadpool_jobs && timeout != -1)
1145 start_time = mono_msec_ticks ();
1146 while (domain->threadpool_jobs) {
1147 WaitForSingleObject (sem_handle, timeout);
1148 if (timeout != -1 && (mono_msec_ticks () - start_time) > timeout) {
1154 domain->cleanup_semaphore = NULL;
1155 CloseHandle (sem_handle);
1160 threadpool_free_queue (ThreadPool *tp)
1162 mono_cq_destroy (tp->queue);
1167 mono_thread_pool_is_queue_array (MonoArray *o)
1169 // gpointer obj = o;
1171 // FIXME: need some fix in sgen code.
1181 EnterCriticalSection (&wsqs_lock);
1182 wsq = mono_wsq_create ();
1184 LeaveCriticalSection (&wsqs_lock);
1187 for (i = 0; i < wsqs->len; i++) {
1188 if (g_ptr_array_index (wsqs, i) == NULL) {
1189 wsqs->pdata [i] = wsq;
1190 LeaveCriticalSection (&wsqs_lock);
1194 g_ptr_array_add (wsqs, wsq);
1195 LeaveCriticalSection (&wsqs_lock);
1200 remove_wsq (MonoWSQ *wsq)
1207 EnterCriticalSection (&wsqs_lock);
1209 LeaveCriticalSection (&wsqs_lock);
1212 g_ptr_array_remove_fast (wsqs, wsq);
1215 * Only clean this up when shutting down, any other case will error out
1216 * if we're removing a queue that still has work items.
1218 if (mono_runtime_is_shutting_down ()) {
1219 while (mono_wsq_local_pop (&data)) {
1220 threadpool_jobs_dec (data);
1224 mono_wsq_destroy (wsq);
1225 LeaveCriticalSection (&wsqs_lock);
1229 try_steal (MonoWSQ *local_wsq, gpointer *data, gboolean retry)
1234 if (wsqs == NULL || data == NULL || *data != NULL)
1239 if (mono_runtime_is_shutting_down ())
1242 EnterCriticalSection (&wsqs_lock);
1243 for (i = 0; wsqs != NULL && i < wsqs->len; i++) {
1246 wsq = wsqs->pdata [i];
1247 if (wsq == local_wsq || mono_wsq_count (wsq) == 0)
1249 mono_wsq_try_steal (wsqs->pdata [i], data, ms);
1250 if (*data != NULL) {
1251 LeaveCriticalSection (&wsqs_lock);
1255 LeaveCriticalSection (&wsqs_lock);
1257 } while (retry && ms < 11);
1261 dequeue_or_steal (ThreadPool *tp, gpointer *data, MonoWSQ *local_wsq)
1263 if (mono_runtime_is_shutting_down ())
1265 mono_cq_dequeue (tp->queue, (MonoObject **) data);
1266 if (!tp->is_io && !*data)
1267 try_steal (local_wsq, data, FALSE);
1268 return (*data != NULL);
1272 process_idle_times (ThreadPool *tp, gint64 t)
1276 gboolean compute_avg;
1280 if (tp->ignore_times || t <= 0)
1283 compute_avg = FALSE;
1284 ticks = mono_100ns_ticks ();
1286 SPIN_LOCK (tp->sp_lock);
1287 if (tp->ignore_times) {
1288 SPIN_UNLOCK (tp->sp_lock);
1293 if (tp->last_check == 0)
1294 tp->last_check = ticks;
1295 else if (tp->last_check > 0 && (ticks - tp->last_check) > 5000000) {
1296 tp->ignore_times = 1;
1299 SPIN_UNLOCK (tp->sp_lock);
1304 //printf ("Items: %d Time elapsed: %.3fs\n", tp->n_sum, (ticks - tp->last_check) / 10000.0);
1305 tp->last_check = ticks;
1307 avg = tp->time_sum / tp->n_sum;
1308 if (tp->averages [1] == 0) {
1309 tp->averages [1] = avg;
1311 per1 = ((100 * (ABS (avg - tp->averages [1]))) / tp->averages [1]);
1313 if (avg > tp->averages [1]) {
1314 if (tp->averages [1] < tp->averages [0]) {
1319 } else if (avg < tp->averages [1] && tp->averages [1] < tp->averages [0]) {
1324 min = tp->min_threads;
1326 if ((n - min) < min && tp->busy_threads == n)
1330 if (new_threads != 0) {
1331 printf ("n: %d per1: %lld avg=%lld avg1=%lld avg0=%lld\n", new_threads, per1, avg, tp->averages [1], tp->averages [0]);
1339 tp->averages [0] = tp->averages [1];
1340 tp->averages [1] = avg;
1341 tp->ignore_times = 0;
1343 if (new_threads == -1) {
1344 if (tp->destroy_thread == 0 && InterlockedCompareExchange (&tp->destroy_thread, 1, 0) == 0)
1345 pulse_on_new_job (tp);
1350 should_i_die (ThreadPool *tp)
1352 gboolean result = FALSE;
1353 if (tp->destroy_thread == 1 && InterlockedCompareExchange (&tp->destroy_thread, 0, 1) == 1)
1354 result = (tp->nthreads > tp->min_threads);
1359 async_invoke_thread (gpointer data)
1362 MonoInternalThread *thread;
1373 thread = mono_thread_internal_current ();
1375 mono_profiler_thread_start (thread->tid);
1376 name = (tp->is_io) ? "IO Threadpool worker" : "Threadpool worker";
1377 mono_thread_set_name_internal (thread, mono_string_new (mono_domain_get (), name), FALSE);
1380 tp_start_func (tp_hooks_user_data);
1384 MonoAsyncResult *ar;
1386 gboolean is_io_task;
1391 ar = (MonoAsyncResult *) data;
1393 InterlockedIncrement (&tp->busy_threads);
1394 domain = ((MonoObject *)ar)->vtable->domain;
1395 #ifndef DISABLE_SOCKETS
1396 klass = ((MonoObject *) data)->vtable->klass;
1397 is_io_task = !is_corlib_asyncresult (domain, klass);
1400 MonoSocketAsyncResult *state = (MonoSocketAsyncResult *) data;
1401 is_socket = is_socketasyncresult (domain, klass);
1403 switch (state->operation) {
1404 case AIO_OP_RECEIVE:
1405 state->total = ICALL_RECV (state);
1408 state->total = ICALL_SEND (state);
1413 /* worker threads invokes methods in different domains,
1414 * so we need to set the right domain here */
1417 if (mono_domain_is_unloading (domain) || mono_runtime_is_shutting_down ()) {
1418 threadpool_jobs_dec ((MonoObject *)ar);
1421 InterlockedDecrement (&tp->busy_threads);
1423 mono_thread_push_appdomain_ref (domain);
1424 if (threadpool_jobs_dec ((MonoObject *)ar)) {
1427 mono_thread_pop_appdomain_ref ();
1428 InterlockedDecrement (&tp->busy_threads);
1432 if (mono_domain_set (domain, FALSE)) {
1435 if (tp_item_begin_func)
1436 tp_item_begin_func (tp_item_user_data);
1438 if (!is_io_task && ar->add_time > 0)
1439 process_idle_times (tp, ar->add_time);
1440 exc = mono_async_invoke (tp, ar);
1441 if (tp_item_end_func)
1442 tp_item_end_func (tp_item_user_data);
1444 mono_internal_thread_unhandled_exception (exc);
1445 if (is_socket && tp->is_io) {
1446 MonoSocketAsyncResult *state = (MonoSocketAsyncResult *) data;
1448 if (state->completed && state->callback) {
1449 MonoAsyncResult *cb_ares;
1450 cb_ares = create_simple_asyncresult ((MonoObject *) state->callback,
1451 (MonoObject *) state);
1452 icall_append_job ((MonoObject *) cb_ares);
1455 mono_domain_set (mono_get_root_domain (), TRUE);
1457 mono_thread_pop_appdomain_ref ();
1458 InterlockedDecrement (&tp->busy_threads);
1459 /* If the callee changes the background status, set it back to TRUE */
1460 mono_thread_clr_state (thread , ~ThreadState_Background);
1461 if (!mono_thread_test_state (thread , ThreadState_Background))
1462 ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background);
1468 must_die = should_i_die (tp);
1469 if (!must_die && (tp->is_io || !mono_wsq_local_pop (&data)))
1470 dequeue_or_steal (tp, &data, wsq);
1473 while (!must_die && !data && n_naps < 4) {
1476 InterlockedIncrement (&tp->waiting);
1478 // Another thread may have added a job into its wsq since the last call to dequeue_or_steal
1479 // Check all the queues again before entering the wait loop
1480 dequeue_or_steal (tp, &data, wsq);
1482 InterlockedDecrement (&tp->waiting);
1486 mono_gc_set_skip_thread (TRUE);
1488 #if defined(__OpenBSD__)
1489 while (mono_cq_count (tp->queue) == 0 && (res = mono_sem_wait (&tp->new_job, TRUE)) == -1) {// && errno == EINTR) {
1491 while (mono_cq_count (tp->queue) == 0 && (res = mono_sem_timedwait (&tp->new_job, 2000, TRUE)) == -1) {// && errno == EINTR) {
1493 if (mono_runtime_is_shutting_down ())
1495 if (THREAD_WANTS_A_BREAK (thread))
1496 mono_thread_interruption_checkpoint ();
1498 InterlockedDecrement (&tp->waiting);
1500 mono_gc_set_skip_thread (FALSE);
1502 if (mono_runtime_is_shutting_down ())
1504 must_die = should_i_die (tp);
1505 dequeue_or_steal (tp, &data, wsq);
1509 if (!data && !tp->is_io && !mono_runtime_is_shutting_down ()) {
1510 mono_wsq_local_pop (&data);
1511 if (data && must_die) {
1512 InterlockedCompareExchange (&tp->destroy_thread, 1, 0);
1513 pulse_on_new_job (tp);
1522 down = mono_runtime_is_shutting_down ();
1523 if (!down && nt <= tp->min_threads)
1525 if (down || InterlockedCompareExchange (&tp->nthreads, nt - 1, nt) == nt) {
1526 mono_perfcounter_update_value (tp->pc_nthreads, TRUE, -1);
1531 mono_profiler_thread_end (thread->tid);
1534 tp_finish_func (tp_hooks_user_data);
1541 g_assert_not_reached ();
1545 ves_icall_System_Threading_ThreadPool_GetAvailableThreads (gint *workerThreads, gint *completionPortThreads)
1547 *workerThreads = async_tp.max_threads - async_tp.busy_threads;
1548 *completionPortThreads = async_io_tp.max_threads - async_io_tp.busy_threads;
1552 ves_icall_System_Threading_ThreadPool_GetMaxThreads (gint *workerThreads, gint *completionPortThreads)
1554 *workerThreads = async_tp.max_threads;
1555 *completionPortThreads = async_io_tp.max_threads;
1559 ves_icall_System_Threading_ThreadPool_GetMinThreads (gint *workerThreads, gint *completionPortThreads)
1561 *workerThreads = async_tp.min_threads;
1562 *completionPortThreads = async_io_tp.min_threads;
1566 ves_icall_System_Threading_ThreadPool_SetMinThreads (gint workerThreads, gint completionPortThreads)
1569 gint max_io_threads;
1571 max_threads = async_tp.max_threads;
1572 if (workerThreads <= 0 || workerThreads > max_threads)
1575 max_io_threads = async_io_tp.max_threads;
1576 if (completionPortThreads <= 0 || completionPortThreads > max_io_threads)
1579 InterlockedExchange (&async_tp.min_threads, workerThreads);
1580 InterlockedExchange (&async_io_tp.min_threads, completionPortThreads);
1581 if (workerThreads > async_tp.nthreads)
1582 mono_thread_create_internal (mono_get_root_domain (), threadpool_start_idle_threads, &async_tp, TRUE, SMALL_STACK);
1583 if (completionPortThreads > async_io_tp.nthreads)
1584 mono_thread_create_internal (mono_get_root_domain (), threadpool_start_idle_threads, &async_io_tp, TRUE, SMALL_STACK);
1589 ves_icall_System_Threading_ThreadPool_SetMaxThreads (gint workerThreads, gint completionPortThreads)
1592 gint min_io_threads;
1595 cpu_count = mono_cpu_count ();
1596 min_threads = async_tp.min_threads;
1597 if (workerThreads < min_threads || workerThreads < cpu_count)
1600 /* We don't really have the concept of completion ports. Do we care here? */
1601 min_io_threads = async_io_tp.min_threads;
1602 if (completionPortThreads < min_io_threads || completionPortThreads < cpu_count)
1605 InterlockedExchange (&async_tp.max_threads, workerThreads);
1606 InterlockedExchange (&async_io_tp.max_threads, completionPortThreads);
1611 * mono_install_threadpool_thread_hooks
1612 * @start_func: the function to be called right after a new threadpool thread is created. Can be NULL.
1613 * @finish_func: the function to be called right before a thredpool thread is exiting. Can be NULL.
1614 * @user_data: argument passed to @start_func and @finish_func.
1616 * @start_fun will be called right after a threadpool thread is created and @finish_func right before a threadpool thread exits.
1617 * The calls will be made from the thread itself.
1620 mono_install_threadpool_thread_hooks (MonoThreadPoolFunc start_func, MonoThreadPoolFunc finish_func, gpointer user_data)
1622 tp_start_func = start_func;
1623 tp_finish_func = finish_func;
1624 tp_hooks_user_data = user_data;
1628 * mono_install_threadpool_item_hooks
1629 * @begin_func: the function to be called before a threadpool work item processing starts.
1630 * @end_func: the function to be called after a threadpool work item is finished.
1631 * @user_data: argument passed to @begin_func and @end_func.
1633 * The calls will be made from the thread itself and from the same AppDomain
1634 * where the work item was executed.
1638 mono_install_threadpool_item_hooks (MonoThreadPoolItemFunc begin_func, MonoThreadPoolItemFunc end_func, gpointer user_data)
1640 tp_item_begin_func = begin_func;
1641 tp_item_end_func = end_func;
1642 tp_item_user_data = user_data;
1646 mono_internal_thread_unhandled_exception (MonoObject* exc)
1648 if (mono_runtime_unhandled_exception_policy_get () == MONO_UNHANDLED_POLICY_CURRENT) {
1652 klass = exc->vtable->klass;
1653 unloaded = is_appdomainunloaded_exception (exc->vtable->domain, klass);
1654 if (!unloaded && klass != mono_defaults.threadabortexception_class) {
1655 mono_unhandled_exception (exc);
1656 if (mono_environment_exitcode_get () == 1)
1659 if (klass == mono_defaults.threadabortexception_class)
1660 mono_thread_internal_reset_abort (mono_thread_internal_current ());