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)
15 #include <mono/metadata/profiler-private.h>
16 #include <mono/metadata/threads.h>
17 #include <mono/metadata/threads-types.h>
18 #include <mono/metadata/threadpool-internals.h>
19 #include <mono/metadata/exception.h>
20 #include <mono/metadata/mono-mlist.h>
21 #include <mono/metadata/mono-perfcounters.h>
22 #include <mono/metadata/socket-io.h>
23 #include <mono/metadata/mono-cq.h>
24 #include <mono/metadata/mono-wsq.h>
25 #include <mono/io-layer/io-layer.h>
26 #include <mono/utils/mono-time.h>
27 #include <mono/utils/mono-proclib.h>
28 #include <mono/utils/mono-semaphore.h>
30 #ifdef HAVE_SYS_TIME_H
33 #include <sys/types.h>
39 #ifdef HAVE_SYS_SOCKET_H
40 #include <sys/socket.h>
42 #include <mono/utils/mono-poll.h>
44 #include <sys/epoll.h>
47 #include <sys/event.h>
51 #ifndef DISABLE_SOCKETS
52 #include "mono/io-layer/socket-wrappers.h"
55 #include "threadpool.h"
57 #define THREAD_WANTS_A_BREAK(t) ((t->state & (ThreadState_StopRequested | \
58 ThreadState_SuspendRequested)) != 0)
60 #define SPIN_TRYLOCK(i) (InterlockedCompareExchange (&(i), 1, 0) == 0)
61 #define SPIN_LOCK(i) do { \
62 if (SPIN_TRYLOCK (i)) \
66 #define SPIN_UNLOCK(i) i = 0
68 /* DEBUG: prints tp data every 2s */
71 /* mono_thread_pool_init called */
72 static volatile int tp_inited;
81 CRITICAL_SECTION io_lock; /* access to sock_to_state */
82 int inited; // 0 -> not initialized , 1->initializing, 2->initialized, 3->cleaned up
83 MonoGHashTable *sock_to_state;
87 void (*modify) (gpointer event_data, int fd, int operation, int events, gboolean is_new);
88 void (*wait) (gpointer sock_data);
89 void (*shutdown) (gpointer event_data);
92 static SocketIOData socket_io_data;
94 /* Keep in sync with the System.MonoAsyncCall class which provides GC tracking */
97 MonoMethodMessage *msg;
98 MonoMethod *cb_method;
99 MonoDelegate *cb_target;
107 MonoCQ *queue; /* GC root */
109 volatile gint waiting; /* threads waiting for a work item */
112 volatile gint pool_status; /* 0 -> not initialized, 1 -> initialized, 2 -> cleaning up */
113 /* min, max, n and busy -> Interlocked */
114 volatile gint min_threads;
115 volatile gint max_threads;
116 volatile gint nthreads;
117 volatile gint busy_threads;
119 void (*async_invoke) (gpointer data);
120 void *pc_nitems; /* Performance counter for total number of items in added */
121 void *pc_nthreads; /* Performance counter for total number of active threads */
123 volatile gint destroy_thread;
124 volatile gint ignore_times; /* Used when there's a thread being created or destroyed */
125 volatile gint sp_lock; /* spin lock used to protect ignore_times */
126 volatile gint64 last_check;
127 volatile gint64 time_sum;
133 static ThreadPool async_tp;
134 static ThreadPool async_io_tp;
136 static void async_invoke_thread (gpointer data);
137 static MonoObject *mono_async_invoke (ThreadPool *tp, MonoAsyncResult *ares);
138 static void threadpool_free_queue (ThreadPool *tp);
139 static void threadpool_append_job (ThreadPool *tp, MonoObject *ar);
140 static void threadpool_append_jobs (ThreadPool *tp, MonoObject **jobs, gint njobs);
141 static void threadpool_init (ThreadPool *tp, int min_threads, int max_threads, void (*async_invoke) (gpointer));
142 static void threadpool_start_idle_threads (ThreadPool *tp);
143 static void threadpool_kill_idle_threads (ThreadPool *tp);
144 static gboolean threadpool_start_thread (ThreadPool *tp);
145 static void monitor_thread (gpointer data);
146 static void socket_io_cleanup (SocketIOData *data);
147 static MonoObject *get_io_event (MonoMList **list, gint event);
148 static int get_events_from_list (MonoMList *list);
149 static int get_event_from_state (MonoSocketAsyncResult *state);
151 static MonoClass *async_call_klass;
152 static MonoClass *socket_async_call_klass;
153 static MonoClass *process_async_call_klass;
155 static GPtrArray *wsqs;
156 CRITICAL_SECTION wsqs_lock;
159 static MonoThreadPoolFunc tp_start_func;
160 static MonoThreadPoolFunc tp_finish_func;
161 static gpointer tp_hooks_user_data;
162 static MonoThreadPoolItemFunc tp_item_begin_func;
163 static MonoThreadPoolItemFunc tp_item_end_func;
164 static gpointer tp_item_user_data;
174 AIO_OP_RECV_JUST_CALLBACK,
175 AIO_OP_SEND_JUST_CALLBACK,
179 AIO_OP_ACCEPTRECEIVE,
180 AIO_OP_RECEIVE_BUFFERS,
185 #include <mono/metadata/tpool-poll.c>
187 #include <mono/metadata/tpool-epoll.c>
188 #elif defined(HAVE_KQUEUE)
189 #include <mono/metadata/tpool-kqueue.c>
192 * Functions to check whenever a class is given system class. We need to cache things in MonoDomain since some of the
193 * assemblies can be unloaded.
197 is_system_type (MonoDomain *domain, MonoClass *klass)
199 if (domain->system_image == NULL)
200 domain->system_image = mono_image_loaded ("System");
202 return klass->image == domain->system_image;
206 is_corlib_type (MonoDomain *domain, MonoClass *klass)
208 return klass->image == mono_defaults.corlib;
212 * Note that we call it is_socket_type() where 'socket' refers to the image
213 * that contains the System.Net.Sockets.Socket type.
214 * For moonlight there is a System.Net.Sockets.Socket class in both System.dll and System.Net.dll.
217 is_socket_type (MonoDomain *domain, MonoClass *klass)
219 static const char *version = NULL;
220 static gboolean moonlight;
222 if (is_system_type (domain, klass))
225 /* If moonlight, check if the type is in System.Net.dll too */
226 if (version == NULL) {
227 version = mono_get_runtime_info ()->framework_version;
228 moonlight = !strcmp (version, "2.1");
234 if (domain->system_net_dll == NULL)
235 domain->system_net_dll = mono_image_loaded ("System.Net");
237 return klass->image == domain->system_net_dll;
240 #define check_type_cached(domain, ASSEMBLY, _class, _namespace, _name, loc) do { \
242 return *loc == _class; \
243 if (is_##ASSEMBLY##_type (domain, _class) && !strcmp (_name, _class->name) && !strcmp (_namespace, _class->name_space)) { \
250 #define check_corlib_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, corlib, _class, _namespace, _name, loc)
252 #define check_socket_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, socket, _class, _namespace, _name, loc)
254 #define check_system_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, system, _class, _namespace, _name, loc)
257 is_corlib_asyncresult (MonoDomain *domain, MonoClass *klass)
259 check_corlib_type_cached (domain, klass, "System.Runtime.Remoting.Messaging", "AsyncResult", &domain->corlib_asyncresult_class);
263 is_socket (MonoDomain *domain, MonoClass *klass)
265 check_socket_type_cached (domain, klass, "System.Net.Sockets", "Socket", &domain->socket_class);
269 is_socketasyncresult (MonoDomain *domain, MonoClass *klass)
271 return (klass->nested_in &&
272 is_socket (domain, klass->nested_in) &&
273 !strcmp (klass->name, "SocketAsyncResult"));
277 is_socketasynccall (MonoDomain *domain, MonoClass *klass)
279 return (klass->nested_in &&
280 is_socket (domain, klass->nested_in) &&
281 !strcmp (klass->name, "SocketAsyncCall"));
285 is_appdomainunloaded_exception (MonoDomain *domain, MonoClass *klass)
287 check_corlib_type_cached (domain, klass, "System", "AppDomainUnloadedException", &domain->ad_unloaded_ex_class);
291 is_sd_process (MonoDomain *domain, MonoClass *klass)
293 check_system_type_cached (domain, klass, "System.Diagnostics", "Process", &domain->process_class);
297 is_sdp_asyncreadhandler (MonoDomain *domain, MonoClass *klass)
300 return (klass->nested_in &&
301 is_sd_process (domain, klass->nested_in) &&
302 !strcmp (klass->name, "AsyncReadHandler"));
306 #ifdef DISABLE_SOCKETS
308 #define socket_io_cleanup(x)
311 get_event_from_state (MonoSocketAsyncResult *state)
313 g_assert_not_reached ();
318 get_events_from_list (MonoMList *list)
326 socket_io_cleanup (SocketIOData *data)
328 EnterCriticalSection (&data->io_lock);
329 if (data->inited != 2) {
330 LeaveCriticalSection (&data->io_lock);
334 data->shutdown (data->event_data);
335 LeaveCriticalSection (&data->io_lock);
339 get_event_from_state (MonoSocketAsyncResult *state)
341 switch (state->operation) {
344 case AIO_OP_RECV_JUST_CALLBACK:
345 case AIO_OP_RECEIVEFROM:
346 case AIO_OP_READPIPE:
347 case AIO_OP_ACCEPTRECEIVE:
348 case AIO_OP_RECEIVE_BUFFERS:
351 case AIO_OP_SEND_JUST_CALLBACK:
354 case AIO_OP_SEND_BUFFERS:
355 case AIO_OP_DISCONNECT:
357 default: /* Should never happen */
358 g_message ("get_event_from_state: unknown value in switch!!!");
364 get_events_from_list (MonoMList *list)
366 MonoSocketAsyncResult *state;
369 while (list && (state = (MonoSocketAsyncResult *)mono_mlist_get_data (list))) {
370 events |= get_event_from_state (state);
371 list = mono_mlist_next (list);
377 #define ICALL_RECV(x) ves_icall_System_Net_Sockets_Socket_Receive_internal (\
378 (SOCKET)(gssize)x->handle, x->buffer, x->offset, x->size,\
379 x->socket_flags, &x->error);
381 #define ICALL_SEND(x) ves_icall_System_Net_Sockets_Socket_Send_internal (\
382 (SOCKET)(gssize)x->handle, x->buffer, x->offset, x->size,\
383 x->socket_flags, &x->error);
385 #endif /* !DISABLE_SOCKETS */
388 threadpool_jobs_inc (MonoObject *obj)
391 InterlockedIncrement (&obj->vtable->domain->threadpool_jobs);
395 threadpool_jobs_dec (MonoObject *obj)
397 MonoDomain *domain = obj->vtable->domain;
398 int remaining_jobs = InterlockedDecrement (&domain->threadpool_jobs);
399 if (remaining_jobs == 0 && domain->cleanup_semaphore) {
400 ReleaseSemaphore (domain->cleanup_semaphore, 1, NULL);
407 get_io_event (MonoMList **list, gint event)
417 state = mono_mlist_get_data (current);
418 if (get_event_from_state ((MonoSocketAsyncResult *) state) == event)
423 current = mono_mlist_next (current);
428 mono_mlist_set_next (prev, mono_mlist_next (current));
430 *list = mono_mlist_next (*list);
438 * select/poll wake up when a socket is closed, but epoll just removes
439 * the socket from its internal list without notification.
442 mono_thread_pool_remove_socket (int sock)
445 MonoSocketAsyncResult *state;
448 if (socket_io_data.inited == 0)
451 EnterCriticalSection (&socket_io_data.io_lock);
452 if (socket_io_data.sock_to_state == NULL) {
453 LeaveCriticalSection (&socket_io_data.io_lock);
456 list = mono_g_hash_table_lookup (socket_io_data.sock_to_state, GINT_TO_POINTER (sock));
458 mono_g_hash_table_remove (socket_io_data.sock_to_state, GINT_TO_POINTER (sock));
459 LeaveCriticalSection (&socket_io_data.io_lock);
462 state = (MonoSocketAsyncResult *) mono_mlist_get_data (list);
463 if (state->operation == AIO_OP_RECEIVE)
464 state->operation = AIO_OP_RECV_JUST_CALLBACK;
465 else if (state->operation == AIO_OP_SEND)
466 state->operation = AIO_OP_SEND_JUST_CALLBACK;
468 ares = get_io_event (&list, MONO_POLLIN);
469 threadpool_append_job (&async_io_tp, ares);
471 ares = get_io_event (&list, MONO_POLLOUT);
472 threadpool_append_job (&async_io_tp, ares);
478 init_event_system (SocketIOData *data)
481 if (data->event_system == EPOLL_BACKEND)
482 data->event_data = tp_epoll_init (data);
483 #elif defined(HAVE_KQUEUE)
484 if (data->event_system == KQUEUE_BACKEND)
485 data->event_data = tp_kqueue_init (data);
487 if (data->event_system == POLL_BACKEND)
488 data->event_data = tp_poll_init (data);
492 socket_io_init (SocketIOData *data)
497 if (data->inited >= 2) // 2 -> initialized, 3-> cleaned up
500 inited = InterlockedCompareExchange (&data->inited, 1, 0);
503 if (data->inited >= 2)
509 EnterCriticalSection (&data->io_lock);
510 data->sock_to_state = mono_g_hash_table_new_type (g_direct_hash, g_direct_equal, MONO_HASH_VALUE_GC);
512 data->event_system = EPOLL_BACKEND;
513 #elif defined(HAVE_KQUEUE)
514 data->event_system = KQUEUE_BACKEND;
516 data->event_system = POLL_BACKEND;
518 if (g_getenv ("MONO_DISABLE_AIO") != NULL)
519 data->event_system = POLL_BACKEND;
521 init_event_system (data);
522 stack_size = mono_threads_get_default_stacksize ();
523 mono_threads_set_default_stacksize (128 * (sizeof (gpointer) / 4) * 1024);
524 mono_thread_create_internal (mono_get_root_domain (), data->wait, data, TRUE);
525 mono_threads_set_default_stacksize (stack_size);
526 LeaveCriticalSection (&data->io_lock);
531 socket_io_add (MonoAsyncResult *ares, MonoSocketAsyncResult *state)
534 SocketIOData *data = &socket_io_data;
539 socket_io_init (&socket_io_data);
540 if (mono_runtime_is_shutting_down () || data->inited == 3 || data->sock_to_state == NULL)
542 if (async_tp.pool_status == 2)
545 MONO_OBJECT_SETREF (state, ares, ares);
547 fd = GPOINTER_TO_INT (state->handle);
548 EnterCriticalSection (&data->io_lock);
549 if (data->sock_to_state == NULL) {
550 LeaveCriticalSection (&data->io_lock);
553 list = mono_g_hash_table_lookup (data->sock_to_state, GINT_TO_POINTER (fd));
555 list = mono_mlist_alloc ((MonoObject*)state);
558 list = mono_mlist_append (list, (MonoObject*)state);
562 mono_g_hash_table_replace (data->sock_to_state, state->handle, list);
563 ievt = get_events_from_list (list);
564 LeaveCriticalSection (&data->io_lock);
565 data->modify (data->event_data, fd, state->operation, ievt, is_new);
568 #ifndef DISABLE_SOCKETS
570 socket_io_filter (MonoObject *target, MonoObject *state)
573 MonoSocketAsyncResult *sock_res;
577 if (target == NULL || state == NULL)
580 domain = target->vtable->domain;
581 klass = target->vtable->klass;
582 if (socket_async_call_klass == NULL && is_socketasynccall (domain, klass))
583 socket_async_call_klass = klass;
585 if (process_async_call_klass == NULL && is_sdp_asyncreadhandler (domain, klass))
586 process_async_call_klass = klass;
588 if (klass != socket_async_call_klass && klass != process_async_call_klass)
591 sock_res = (MonoSocketAsyncResult *) state;
592 op = sock_res->operation;
593 if (op < AIO_OP_FIRST || op >= AIO_OP_LAST)
598 #endif /* !DISABLE_SOCKETS */
600 /* Returns the exception thrown when invoking, if any */
602 mono_async_invoke (ThreadPool *tp, MonoAsyncResult *ares)
604 ASyncCall *ac = (ASyncCall *)ares->object_data;
605 MonoObject *res, *exc = NULL;
606 MonoArray *out_args = NULL;
607 HANDLE wait_event = NULL;
609 if (ares->execution_context) {
610 /* use captured ExecutionContext (if available) */
611 MONO_OBJECT_SETREF (ares, original_context, mono_thread_get_execution_context ());
612 mono_thread_set_execution_context (ares->execution_context);
614 ares->original_context = NULL;
618 /* Fast path from ThreadPool.*QueueUserWorkItem */
619 void *pa = ares->async_state;
620 mono_runtime_delegate_invoke (ares->async_delegate, &pa, &exc);
622 MonoObject *cb_exc = NULL;
625 res = mono_message_invoke (ares->async_delegate, ac->msg, &exc, &out_args);
626 MONO_OBJECT_SETREF (ac, res, res);
627 MONO_OBJECT_SETREF (ac, msg->exc, exc);
628 MONO_OBJECT_SETREF (ac, out_args, out_args);
630 mono_monitor_enter ((MonoObject *) ares);
632 if (ares->handle != NULL)
633 wait_event = mono_wait_handle_get_handle ((MonoWaitHandle *) ares->handle);
634 mono_monitor_exit ((MonoObject *) ares);
635 /* notify listeners */
636 if (wait_event != NULL)
637 SetEvent (wait_event);
639 /* call async callback if cb_method != null*/
640 if (ac != NULL && ac->cb_method) {
643 mono_runtime_invoke (ac->cb_method, ac->cb_target, pa, &cb_exc);
644 MONO_OBJECT_SETREF (ac->msg, exc, cb_exc);
651 /* restore original thread execution context if flow isn't suppressed, i.e. non null */
652 if (ares->original_context) {
653 mono_thread_set_execution_context (ares->original_context);
654 ares->original_context = NULL;
660 threadpool_start_idle_threads (ThreadPool *tp)
664 if (tp->pool_status == 1 && !tp->is_io)
665 mono_thread_create_internal (mono_get_root_domain (), monitor_thread, tp, TRUE);
669 if (n >= tp->min_threads)
671 if (InterlockedCompareExchange (&tp->nthreads, n + 1, n) == n)
674 mono_perfcounter_update_value (tp->pc_nthreads, TRUE, 1);
675 mono_thread_create_internal (mono_get_root_domain (), tp->async_invoke, tp, TRUE);
681 threadpool_init (ThreadPool *tp, int min_threads, int max_threads, void (*async_invoke) (gpointer))
683 memset (tp, 0, sizeof (ThreadPool));
684 tp->min_threads = min_threads;
685 tp->max_threads = max_threads;
686 tp->async_invoke = async_invoke;
687 tp->queue = mono_cq_create ();
688 MONO_SEM_INIT (&tp->new_job, 0);
692 init_perf_counter (const char *category, const char *counter)
694 MonoString *category_str;
695 MonoString *counter_str;
701 if (category == NULL || counter == NULL)
703 root = mono_get_root_domain ();
704 category_str = mono_string_new (root, category);
705 counter_str = mono_string_new (root, counter);
706 machine = mono_string_new (root, ".");
707 return mono_perfcounter_get_impl (category_str, counter_str, NULL, machine, &type, &custom);
712 print_pool_info (ThreadPool *tp)
715 // if (tp->tail - tp->head == 0)
718 g_print ("Pool status? %d\n", InterlockedCompareExchange (&tp->pool_status, 0, 0));
719 g_print ("Min. threads: %d\n", InterlockedCompareExchange (&tp->min_threads, 0, 0));
720 g_print ("Max. threads: %d\n", InterlockedCompareExchange (&tp->max_threads, 0, 0));
721 g_print ("nthreads: %d\n", InterlockedCompareExchange (&tp->nthreads, 0, 0));
722 g_print ("busy threads: %d\n", InterlockedCompareExchange (&tp->busy_threads, 0, 0));
723 g_print ("Waiting: %d\n", InterlockedCompareExchange (&tp->waiting, 0, 0));
724 g_print ("Queued: %d\n", (tp->tail - tp->head));
725 if (tp == &async_tp) {
727 EnterCriticalSection (&wsqs_lock);
728 for (i = 0; i < wsqs->len; i++) {
729 g_print ("\tWSQ %d: %d\n", i, mono_wsq_count (g_ptr_array_index (wsqs, i)));
731 LeaveCriticalSection (&wsqs_lock);
733 g_print ("\tSockets: %d\n", mono_g_hash_table_size (socket_io_data.sock_to_state));
735 g_print ("-------------\n");
739 signal_handler (int signo)
744 g_print ("\n-----Non-IO-----\n");
745 print_pool_info (tp);
747 g_print ("\n-----IO-----\n");
748 print_pool_info (tp);
754 monitor_thread (gpointer data)
757 MonoInternalThread *thread;
763 thread = mono_thread_internal_current ();
764 ves_icall_System_Threading_Thread_SetName_internal (thread, mono_string_new (mono_domain_get (), "Threapool monitor"));
769 ts = mono_msec_ticks ();
770 if (SleepEx (ms, TRUE) == 0)
772 ms -= (mono_msec_ticks () - ts);
773 if (mono_runtime_is_shutting_down ())
775 if (THREAD_WANTS_A_BREAK (thread))
776 mono_thread_interruption_checkpoint ();
779 if (mono_runtime_is_shutting_down ())
783 need_one = (mono_cq_count (tp->queue) > 0);
785 EnterCriticalSection (&wsqs_lock);
786 for (i = 0; wsqs != NULL && i < wsqs->len; i++) {
788 wsq = g_ptr_array_index (wsqs, i);
789 if (mono_wsq_count (wsq) > 0) {
794 LeaveCriticalSection (&wsqs_lock);
797 threadpool_start_thread (tp);
802 mono_thread_pool_init ()
804 gint threads_per_cpu = 1;
806 gint cpu_count = mono_cpu_count ();
812 result = InterlockedCompareExchange (&tp_inited, 1, 0);
821 MONO_GC_REGISTER_ROOT_FIXED (socket_io_data.sock_to_state);
822 InitializeCriticalSection (&socket_io_data.io_lock);
823 if (g_getenv ("MONO_THREADS_PER_CPU") != NULL) {
824 threads_per_cpu = atoi (g_getenv ("MONO_THREADS_PER_CPU"));
825 if (threads_per_cpu < 1)
829 thread_count = MIN (cpu_count * threads_per_cpu, 100 * cpu_count);
830 threadpool_init (&async_tp, thread_count, MAX (100 * cpu_count, thread_count), async_invoke_thread);
831 threadpool_init (&async_io_tp, cpu_count * 2, cpu_count * 4, async_invoke_thread);
832 async_io_tp.is_io = TRUE;
834 async_call_klass = mono_class_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
835 g_assert (async_call_klass);
837 InitializeCriticalSection (&wsqs_lock);
838 wsqs = g_ptr_array_sized_new (MAX (100 * cpu_count, thread_count));
841 async_tp.pc_nitems = init_perf_counter ("Mono Threadpool", "Work Items Added");
842 g_assert (async_tp.pc_nitems);
844 async_io_tp.pc_nitems = init_perf_counter ("Mono Threadpool", "IO Work Items Added");
845 g_assert (async_io_tp.pc_nitems);
847 async_tp.pc_nthreads = init_perf_counter ("Mono Threadpool", "# of Threads");
848 g_assert (async_tp.pc_nthreads);
850 async_io_tp.pc_nthreads = init_perf_counter ("Mono Threadpool", "# of IO Threads");
851 g_assert (async_io_tp.pc_nthreads);
854 signal (SIGALRM, signal_handler);
859 static MonoAsyncResult *
860 create_simple_asyncresult (MonoObject *target, MonoObject *state)
862 MonoDomain *domain = mono_domain_get ();
863 MonoAsyncResult *ares;
865 /* Don't call mono_async_result_new() to avoid capturing the context */
866 ares = (MonoAsyncResult *) mono_object_new (domain, mono_defaults.asyncresult_class);
867 MONO_OBJECT_SETREF (ares, async_delegate, target);
868 MONO_OBJECT_SETREF (ares, async_state, state);
873 icall_append_io_job (MonoObject *target, MonoSocketAsyncResult *state)
875 MonoAsyncResult *ares;
877 ares = create_simple_asyncresult (target, (MonoObject *) state);
878 socket_io_add (ares, state);
882 mono_thread_pool_add (MonoObject *target, MonoMethodMessage *msg, MonoDelegate *async_callback,
885 MonoDomain *domain = mono_domain_get ();
886 MonoAsyncResult *ares;
889 ac = (ASyncCall*)mono_object_new (domain, async_call_klass);
890 MONO_OBJECT_SETREF (ac, msg, msg);
891 MONO_OBJECT_SETREF (ac, state, state);
893 if (async_callback) {
894 ac->cb_method = mono_get_delegate_invoke (((MonoObject *)async_callback)->vtable->klass);
895 MONO_OBJECT_SETREF (ac, cb_target, async_callback);
898 ares = mono_async_result_new (domain, NULL, ac->state, NULL, (MonoObject*)ac);
899 MONO_OBJECT_SETREF (ares, async_delegate, target);
901 #ifndef DISABLE_SOCKETS
902 if (socket_io_filter (target, state)) {
903 socket_io_add (ares, (MonoSocketAsyncResult *) state);
907 threadpool_append_job (&async_tp, (MonoObject *) ares);
912 mono_thread_pool_finish (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc)
920 /* check if already finished */
921 mono_monitor_enter ((MonoObject *) ares);
923 if (ares->endinvoke_called) {
924 *exc = (MonoObject *) mono_get_exception_invalid_operation (NULL);
925 mono_monitor_exit ((MonoObject *) ares);
929 ares->endinvoke_called = 1;
930 /* wait until we are really finished */
931 if (!ares->completed) {
932 if (ares->handle == NULL) {
933 wait_event = CreateEvent (NULL, TRUE, FALSE, NULL);
934 g_assert(wait_event != 0);
935 MONO_OBJECT_SETREF (ares, handle, (MonoObject *) mono_wait_handle_new (mono_object_domain (ares), wait_event));
937 wait_event = mono_wait_handle_get_handle ((MonoWaitHandle *) ares->handle);
939 mono_monitor_exit ((MonoObject *) ares);
940 WaitForSingleObjectEx (wait_event, INFINITE, TRUE);
942 mono_monitor_exit ((MonoObject *) ares);
945 ac = (ASyncCall *) ares->object_data;
946 g_assert (ac != NULL);
947 *exc = ac->msg->exc; /* FIXME: GC add write barrier */
948 *out_args = ac->out_args;
954 threadpool_kill_idle_threads (ThreadPool *tp)
958 n = (gint) InterlockedCompareExchange (&tp->max_threads, 0, -1);
961 MONO_SEM_POST (&tp->new_job);
966 mono_thread_pool_cleanup (void)
968 if (!(async_tp.pool_status == 0 || async_tp.pool_status == 2)) {
969 if (!(async_tp.pool_status == 1 && InterlockedCompareExchange (&async_tp.pool_status, 2, 1) == 2)) {
970 InterlockedExchange (&async_io_tp.pool_status, 2);
971 threadpool_free_queue (&async_tp);
972 threadpool_kill_idle_threads (&async_tp);
974 socket_io_cleanup (&socket_io_data); /* Empty when DISABLE_SOCKETS is defined */
975 threadpool_free_queue (&async_io_tp);
976 threadpool_kill_idle_threads (&async_io_tp);
977 MONO_SEM_DESTROY (&async_io_tp.new_job);
981 EnterCriticalSection (&wsqs_lock);
984 g_ptr_array_free (wsqs, TRUE);
986 LeaveCriticalSection (&wsqs_lock);
987 MONO_SEM_DESTROY (&async_tp.new_job);
991 threadpool_start_thread (ThreadPool *tp)
995 while (!mono_runtime_is_shutting_down () && (n = tp->nthreads) < tp->max_threads) {
996 if (InterlockedCompareExchange (&tp->nthreads, n + 1, n) == n) {
997 mono_perfcounter_update_value (tp->pc_nthreads, TRUE, 1);
998 mono_thread_create_internal (mono_get_root_domain (), tp->async_invoke, tp, TRUE);
1007 pulse_on_new_job (ThreadPool *tp)
1010 MONO_SEM_POST (&tp->new_job);
1014 icall_append_job (MonoObject *ar)
1016 threadpool_append_job (&async_tp, ar);
1020 threadpool_append_job (ThreadPool *tp, MonoObject *ar)
1022 threadpool_append_jobs (tp, &ar, 1);
1026 threadpool_append_jobs (ThreadPool *tp, MonoObject **jobs, gint njobs)
1028 static int job_counter;
1032 if (mono_runtime_is_shutting_down ())
1035 if (tp->pool_status == 0 && InterlockedCompareExchange (&tp->pool_status, 1, 0) == 0)
1036 mono_thread_create_internal (mono_get_root_domain (), threadpool_start_idle_threads, tp, TRUE);
1038 for (i = 0; i < njobs; i++) {
1040 if (ar == NULL || mono_domain_is_unloading (ar->vtable->domain))
1041 continue; /* Might happen when cleaning domain jobs */
1042 if (!tp->is_io && (InterlockedIncrement (&job_counter) % 10) == 0) {
1043 MonoAsyncResult *o = (MonoAsyncResult *) ar;
1044 o->add_time = mono_100ns_ticks ();
1046 threadpool_jobs_inc (ar);
1047 mono_perfcounter_update_value (tp->pc_nitems, TRUE, 1);
1048 if (!tp->is_io && mono_wsq_local_push (ar))
1051 mono_cq_enqueue (tp->queue, ar);
1054 for (i = 0; i < MIN(njobs, tp->max_threads); i++)
1055 pulse_on_new_job (tp);
1059 threadpool_clear_queue (ThreadPool *tp, MonoDomain *domain)
1067 while (mono_cq_dequeue (tp->queue, &obj)) {
1068 if (obj != NULL && obj->vtable->domain == domain) {
1070 threadpool_jobs_dec (obj);
1071 } else if (obj != NULL) {
1072 other = mono_mlist_prepend (other, obj);
1077 threadpool_append_job (tp, (MonoObject *) mono_mlist_get_data (other));
1078 other = mono_mlist_next (other);
1083 * Clean up the threadpool of all domain jobs.
1084 * Can only be called as part of the domain unloading process as
1085 * it will wait for all jobs to be visible to the interruption code.
1088 mono_thread_pool_remove_domain_jobs (MonoDomain *domain, int timeout)
1092 guint32 start_time = 0;
1094 g_assert (domain->state == MONO_APPDOMAIN_UNLOADING);
1096 threadpool_clear_queue (&async_tp, domain);
1097 threadpool_clear_queue (&async_io_tp, domain);
1100 * There might be some threads out that could be about to execute stuff from the given domain.
1101 * We avoid that by setting up a semaphore to be pulsed by the thread that reaches zero.
1103 sem_handle = CreateSemaphore (NULL, 0, 1, NULL);
1105 domain->cleanup_semaphore = sem_handle;
1107 * The memory barrier here is required to have global ordering between assigning to cleanup_semaphone
1108 * and reading threadpool_jobs.
1109 * Otherwise this thread could read a stale version of threadpool_jobs and wait forever.
1111 mono_memory_write_barrier ();
1113 if (domain->threadpool_jobs && timeout != -1)
1114 start_time = mono_msec_ticks ();
1115 while (domain->threadpool_jobs) {
1116 WaitForSingleObject (sem_handle, timeout);
1117 if (timeout != -1 && (mono_msec_ticks () - start_time) > timeout) {
1123 domain->cleanup_semaphore = NULL;
1124 CloseHandle (sem_handle);
1129 threadpool_free_queue (ThreadPool *tp)
1131 mono_cq_destroy (tp->queue);
1136 mono_thread_pool_is_queue_array (MonoArray *o)
1138 // gpointer obj = o;
1140 // FIXME: need some fix in sgen code.
1150 EnterCriticalSection (&wsqs_lock);
1151 wsq = mono_wsq_create ();
1153 LeaveCriticalSection (&wsqs_lock);
1156 for (i = 0; i < wsqs->len; i++) {
1157 if (g_ptr_array_index (wsqs, i) == NULL) {
1158 wsqs->pdata [i] = wsq;
1159 LeaveCriticalSection (&wsqs_lock);
1163 g_ptr_array_add (wsqs, wsq);
1164 LeaveCriticalSection (&wsqs_lock);
1169 remove_wsq (MonoWSQ *wsq)
1176 EnterCriticalSection (&wsqs_lock);
1178 LeaveCriticalSection (&wsqs_lock);
1181 g_ptr_array_remove_fast (wsqs, wsq);
1184 * Only clean this up when shutting down, any other case will error out
1185 * if we're removing a queue that still has work items.
1187 if (mono_runtime_is_shutting_down ()) {
1188 while (mono_wsq_local_pop (&data)) {
1189 threadpool_jobs_dec (data);
1193 mono_wsq_destroy (wsq);
1194 LeaveCriticalSection (&wsqs_lock);
1198 try_steal (gpointer *data, gboolean retry)
1203 if (wsqs == NULL || data == NULL || *data != NULL)
1208 if (mono_runtime_is_shutting_down ())
1210 for (i = 0; wsqs != NULL && i < wsqs->len; i++) {
1211 if (mono_runtime_is_shutting_down ()) {
1214 mono_wsq_try_steal (wsqs->pdata [i], data, ms);
1215 if (*data != NULL) {
1220 } while (retry && ms < 11);
1224 dequeue_or_steal (ThreadPool *tp, gpointer *data)
1226 if (mono_runtime_is_shutting_down ())
1228 mono_cq_dequeue (tp->queue, (MonoObject **) data);
1229 if (!tp->is_io && !*data)
1230 try_steal (data, FALSE);
1231 return (*data != NULL);
1235 process_idle_times (ThreadPool *tp, gint64 t)
1239 gboolean compute_avg;
1243 if (tp->ignore_times || t <= 0)
1246 compute_avg = FALSE;
1247 ticks = mono_100ns_ticks ();
1249 SPIN_LOCK (tp->sp_lock);
1250 if (tp->ignore_times) {
1251 SPIN_UNLOCK (tp->sp_lock);
1256 if (tp->last_check == 0)
1257 tp->last_check = ticks;
1258 else if (tp->last_check > 0 && (ticks - tp->last_check) > 5000000) {
1259 tp->ignore_times = 1;
1262 SPIN_UNLOCK (tp->sp_lock);
1267 //printf ("Items: %d Time elapsed: %.3fs\n", tp->n_sum, (ticks - tp->last_check) / 10000.0);
1268 tp->last_check = ticks;
1270 avg = tp->time_sum / tp->n_sum;
1271 if (tp->averages [1] == 0) {
1272 tp->averages [1] = avg;
1274 per1 = ((100 * (ABS (avg - tp->averages [1]))) / tp->averages [1]);
1276 if (avg > tp->averages [1]) {
1277 if (tp->averages [1] < tp->averages [0]) {
1282 } else if (avg < tp->averages [1] && tp->averages [1] < tp->averages [0]) {
1287 min = tp->min_threads;
1289 if ((n - min) < min && tp->busy_threads == n)
1293 if (new_threads != 0) {
1294 printf ("n: %d per1: %lld avg=%lld avg1=%lld avg0=%lld\n", new_threads, per1, avg, tp->averages [1], tp->averages [0]);
1302 tp->averages [0] = tp->averages [1];
1303 tp->averages [1] = avg;
1304 tp->ignore_times = 0;
1306 if (new_threads == -1) {
1307 if (tp->destroy_thread == 0 && InterlockedCompareExchange (&tp->destroy_thread, 1, 0) == 0)
1308 pulse_on_new_job (tp);
1313 should_i_die (ThreadPool *tp)
1315 gboolean result = FALSE;
1316 if (tp->destroy_thread == 1 && InterlockedCompareExchange (&tp->destroy_thread, 0, 1) == 1)
1317 result = (tp->nthreads > tp->min_threads);
1322 async_invoke_thread (gpointer data)
1325 MonoInternalThread *thread;
1335 thread = mono_thread_internal_current ();
1337 mono_profiler_thread_start (thread->tid);
1338 ves_icall_System_Threading_Thread_SetName_internal (thread, mono_string_new (mono_domain_get (), "Threapool worker"));
1341 tp_start_func (tp_hooks_user_data);
1345 MonoAsyncResult *ar;
1347 gboolean is_io_task;
1352 ar = (MonoAsyncResult *) data;
1354 InterlockedIncrement (&tp->busy_threads);
1355 domain = ((MonoObject *)ar)->vtable->domain;
1356 #ifndef DISABLE_SOCKETS
1357 klass = ((MonoObject *) data)->vtable->klass;
1358 is_io_task = !is_corlib_asyncresult (domain, klass);
1361 MonoSocketAsyncResult *state = (MonoSocketAsyncResult *) data;
1362 is_socket = is_socketasyncresult (domain, klass);
1364 switch (state->operation) {
1365 case AIO_OP_RECEIVE:
1366 state->total = ICALL_RECV (state);
1369 state->total = ICALL_SEND (state);
1374 /* worker threads invokes methods in different domains,
1375 * so we need to set the right domain here */
1378 if (mono_domain_is_unloading (domain) || mono_runtime_is_shutting_down ()) {
1379 threadpool_jobs_dec ((MonoObject *)ar);
1382 InterlockedDecrement (&tp->busy_threads);
1384 mono_thread_push_appdomain_ref (domain);
1385 if (threadpool_jobs_dec ((MonoObject *)ar)) {
1388 mono_thread_pop_appdomain_ref ();
1389 InterlockedDecrement (&tp->busy_threads);
1393 if (mono_domain_set (domain, FALSE)) {
1396 if (tp_item_begin_func)
1397 tp_item_begin_func (tp_item_user_data);
1399 if (!is_io_task && ar->add_time > 0)
1400 process_idle_times (tp, ar->add_time);
1401 exc = mono_async_invoke (tp, ar);
1402 if (tp_item_end_func)
1403 tp_item_end_func (tp_item_user_data);
1404 if (exc && mono_runtime_unhandled_exception_policy_get () == MONO_UNHANDLED_POLICY_CURRENT) {
1408 klass = exc->vtable->klass;
1409 unloaded = is_appdomainunloaded_exception (exc->vtable->domain, klass);
1410 if (!unloaded && klass != mono_defaults.threadabortexception_class) {
1411 mono_unhandled_exception (exc);
1414 if (klass == mono_defaults.threadabortexception_class)
1415 mono_thread_internal_reset_abort (thread);
1417 if (is_socket && tp->is_io) {
1418 MonoSocketAsyncResult *state = (MonoSocketAsyncResult *) data;
1420 if (state->completed && state->callback) {
1421 MonoAsyncResult *cb_ares;
1422 cb_ares = create_simple_asyncresult ((MonoObject *) state->callback,
1423 (MonoObject *) state);
1424 icall_append_job ((MonoObject *) cb_ares);
1427 mono_domain_set (mono_get_root_domain (), TRUE);
1429 mono_thread_pop_appdomain_ref ();
1430 InterlockedDecrement (&tp->busy_threads);
1431 /* If the callee changes the background status, set it back to TRUE */
1432 mono_thread_clr_state (thread , ~ThreadState_Background);
1433 if (!mono_thread_test_state (thread , ThreadState_Background))
1434 ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background);
1440 must_die = should_i_die (tp);
1441 if (!must_die && (tp->is_io || !mono_wsq_local_pop (&data)))
1442 dequeue_or_steal (tp, &data);
1445 while (!must_die && !data && n_naps < 4) {
1448 InterlockedIncrement (&tp->waiting);
1449 #if defined(__OpenBSD__)
1450 while ((res = mono_sem_wait (&tp->new_job, TRUE)) == -1) {// && errno == EINTR) {
1452 while ((res = mono_sem_timedwait (&tp->new_job, 2000, TRUE)) == -1) {// && errno == EINTR) {
1454 if (mono_runtime_is_shutting_down ())
1456 if (THREAD_WANTS_A_BREAK (thread))
1457 mono_thread_interruption_checkpoint ();
1459 InterlockedDecrement (&tp->waiting);
1460 if (mono_runtime_is_shutting_down ())
1462 must_die = should_i_die (tp);
1463 dequeue_or_steal (tp, &data);
1467 if (!data && !tp->is_io && !mono_runtime_is_shutting_down ()) {
1468 mono_wsq_local_pop (&data);
1469 if (data && must_die) {
1470 InterlockedCompareExchange (&tp->destroy_thread, 1, 0);
1471 pulse_on_new_job (tp);
1480 down = mono_runtime_is_shutting_down ();
1481 if (!down && nt <= tp->min_threads)
1483 if (down || InterlockedCompareExchange (&tp->nthreads, nt - 1, nt) == nt) {
1484 mono_perfcounter_update_value (tp->pc_nthreads, TRUE, -1);
1489 mono_profiler_thread_end (thread->tid);
1492 tp_finish_func (tp_hooks_user_data);
1499 g_assert_not_reached ();
1503 ves_icall_System_Threading_ThreadPool_GetAvailableThreads (gint *workerThreads, gint *completionPortThreads)
1505 *workerThreads = async_tp.max_threads - async_tp.busy_threads;
1506 *completionPortThreads = async_io_tp.max_threads - async_io_tp.busy_threads;
1510 ves_icall_System_Threading_ThreadPool_GetMaxThreads (gint *workerThreads, gint *completionPortThreads)
1512 *workerThreads = async_tp.max_threads;
1513 *completionPortThreads = async_io_tp.max_threads;
1517 ves_icall_System_Threading_ThreadPool_GetMinThreads (gint *workerThreads, gint *completionPortThreads)
1519 *workerThreads = async_tp.min_threads;
1520 *completionPortThreads = async_io_tp.min_threads;
1524 ves_icall_System_Threading_ThreadPool_SetMinThreads (gint workerThreads, gint completionPortThreads)
1527 gint max_io_threads;
1529 max_threads = async_tp.max_threads;
1530 if (workerThreads <= 0 || workerThreads > max_threads)
1533 max_io_threads = async_io_tp.max_threads;
1534 if (completionPortThreads <= 0 || completionPortThreads > max_io_threads)
1537 InterlockedExchange (&async_tp.min_threads, workerThreads);
1538 InterlockedExchange (&async_io_tp.min_threads, completionPortThreads);
1539 if (workerThreads > async_tp.nthreads)
1540 mono_thread_create_internal (mono_get_root_domain (), threadpool_start_idle_threads, &async_tp, TRUE);
1541 if (completionPortThreads > async_io_tp.nthreads)
1542 mono_thread_create_internal (mono_get_root_domain (), threadpool_start_idle_threads, &async_io_tp, TRUE);
1547 ves_icall_System_Threading_ThreadPool_SetMaxThreads (gint workerThreads, gint completionPortThreads)
1550 gint min_io_threads;
1553 cpu_count = mono_cpu_count ();
1554 min_threads = async_tp.min_threads;
1555 if (workerThreads < min_threads || workerThreads < cpu_count)
1558 /* We don't really have the concept of completion ports. Do we care here? */
1559 min_io_threads = async_io_tp.min_threads;
1560 if (completionPortThreads < min_io_threads || completionPortThreads < cpu_count)
1563 InterlockedExchange (&async_tp.max_threads, workerThreads);
1564 InterlockedExchange (&async_io_tp.max_threads, completionPortThreads);
1569 * mono_install_threadpool_thread_hooks
1570 * @start_func: the function to be called right after a new threadpool thread is created. Can be NULL.
1571 * @finish_func: the function to be called right before a thredpool thread is exiting. Can be NULL.
1572 * @user_data: argument passed to @start_func and @finish_func.
1574 * @start_fun will be called right after a threadpool thread is created and @finish_func right before a threadpool thread exits.
1575 * The calls will be made from the thread itself.
1578 mono_install_threadpool_thread_hooks (MonoThreadPoolFunc start_func, MonoThreadPoolFunc finish_func, gpointer user_data)
1580 tp_start_func = start_func;
1581 tp_finish_func = finish_func;
1582 tp_hooks_user_data = user_data;
1586 * mono_install_threadpool_item_hooks
1587 * @begin_func: the function to be called before a threadpool work item processing starts.
1588 * @end_func: the function to be called after a threadpool work item is finished.
1589 * @user_data: argument passed to @begin_func and @end_func.
1591 * The calls will be made from the thread itself and from the same AppDomain
1592 * where the work item was executed.
1596 mono_install_threadpool_item_hooks (MonoThreadPoolItemFunc begin_func, MonoThreadPoolItemFunc end_func, gpointer user_data)
1598 tp_item_begin_func = begin_func;
1599 tp_item_end_func = end_func;
1600 tp_item_user_data = user_data;