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
67 #define SMALL_STACK (128 * (sizeof (gpointer) / 4) * 1024)
69 /* DEBUG: prints tp data every 2s */
72 /* mono_thread_pool_init called */
73 static volatile int tp_inited;
82 CRITICAL_SECTION io_lock; /* access to sock_to_state */
83 int inited; // 0 -> not initialized , 1->initializing, 2->initialized, 3->cleaned up
84 MonoGHashTable *sock_to_state;
88 void (*modify) (gpointer event_data, int fd, int operation, int events, gboolean is_new);
89 void (*wait) (gpointer sock_data);
90 void (*shutdown) (gpointer event_data);
93 static SocketIOData socket_io_data;
95 /* Keep in sync with the System.MonoAsyncCall class which provides GC tracking */
98 MonoMethodMessage *msg;
99 MonoMethod *cb_method;
100 MonoDelegate *cb_target;
108 MonoCQ *queue; /* GC root */
110 volatile gint waiting; /* threads waiting for a work item */
113 volatile gint pool_status; /* 0 -> not initialized, 1 -> initialized, 2 -> cleaning up */
114 /* min, max, n and busy -> Interlocked */
115 volatile gint min_threads;
116 volatile gint max_threads;
117 volatile gint nthreads;
118 volatile gint busy_threads;
120 void (*async_invoke) (gpointer data);
121 void *pc_nitems; /* Performance counter for total number of items in added */
122 void *pc_nthreads; /* Performance counter for total number of active threads */
124 volatile gint destroy_thread;
125 volatile gint ignore_times; /* Used when there's a thread being created or destroyed */
126 volatile gint sp_lock; /* spin lock used to protect ignore_times */
127 volatile gint64 last_check;
128 volatile gint64 time_sum;
134 static ThreadPool async_tp;
135 static ThreadPool async_io_tp;
137 static void async_invoke_thread (gpointer data);
138 static MonoObject *mono_async_invoke (ThreadPool *tp, MonoAsyncResult *ares);
139 static void threadpool_free_queue (ThreadPool *tp);
140 static void threadpool_append_job (ThreadPool *tp, MonoObject *ar);
141 static void threadpool_append_jobs (ThreadPool *tp, MonoObject **jobs, gint njobs);
142 static void threadpool_init (ThreadPool *tp, int min_threads, int max_threads, void (*async_invoke) (gpointer));
143 static void threadpool_start_idle_threads (ThreadPool *tp);
144 static void threadpool_kill_idle_threads (ThreadPool *tp);
145 static gboolean threadpool_start_thread (ThreadPool *tp);
146 static void monitor_thread (gpointer data);
147 static void socket_io_cleanup (SocketIOData *data);
148 static MonoObject *get_io_event (MonoMList **list, gint event);
149 static int get_events_from_list (MonoMList *list);
150 static int get_event_from_state (MonoSocketAsyncResult *state);
152 static MonoClass *async_call_klass;
153 static MonoClass *socket_async_call_klass;
154 static MonoClass *process_async_call_klass;
156 static GPtrArray *wsqs;
157 CRITICAL_SECTION wsqs_lock;
160 static MonoThreadPoolFunc tp_start_func;
161 static MonoThreadPoolFunc tp_finish_func;
162 static gpointer tp_hooks_user_data;
163 static MonoThreadPoolItemFunc tp_item_begin_func;
164 static MonoThreadPoolItemFunc tp_item_end_func;
165 static gpointer tp_item_user_data;
175 AIO_OP_RECV_JUST_CALLBACK,
176 AIO_OP_SEND_JUST_CALLBACK,
180 AIO_OP_ACCEPTRECEIVE,
181 AIO_OP_RECEIVE_BUFFERS,
186 #include <mono/metadata/tpool-poll.c>
188 #include <mono/metadata/tpool-epoll.c>
189 #elif defined(HAVE_KQUEUE)
190 #include <mono/metadata/tpool-kqueue.c>
193 * Functions to check whenever a class is given system class. We need to cache things in MonoDomain since some of the
194 * assemblies can be unloaded.
198 is_system_type (MonoDomain *domain, MonoClass *klass)
200 if (domain->system_image == NULL)
201 domain->system_image = mono_image_loaded ("System");
203 return klass->image == domain->system_image;
207 is_corlib_type (MonoDomain *domain, MonoClass *klass)
209 return klass->image == mono_defaults.corlib;
213 * Note that we call it is_socket_type() where 'socket' refers to the image
214 * that contains the System.Net.Sockets.Socket type.
215 * For moonlight there is a System.Net.Sockets.Socket class in both System.dll and System.Net.dll.
218 is_socket_type (MonoDomain *domain, MonoClass *klass)
220 static const char *version = NULL;
221 static gboolean moonlight;
223 if (is_system_type (domain, klass))
226 /* If moonlight, check if the type is in System.Net.dll too */
227 if (version == NULL) {
228 version = mono_get_runtime_info ()->framework_version;
229 moonlight = !strcmp (version, "2.1");
235 if (domain->system_net_dll == NULL)
236 domain->system_net_dll = mono_image_loaded ("System.Net");
238 return klass->image == domain->system_net_dll;
241 #define check_type_cached(domain, ASSEMBLY, _class, _namespace, _name, loc) do { \
243 return *loc == _class; \
244 if (is_##ASSEMBLY##_type (domain, _class) && !strcmp (_name, _class->name) && !strcmp (_namespace, _class->name_space)) { \
251 #define check_corlib_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, corlib, _class, _namespace, _name, loc)
253 #define check_socket_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, socket, _class, _namespace, _name, loc)
255 #define check_system_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, system, _class, _namespace, _name, loc)
258 is_corlib_asyncresult (MonoDomain *domain, MonoClass *klass)
260 check_corlib_type_cached (domain, klass, "System.Runtime.Remoting.Messaging", "AsyncResult", &domain->corlib_asyncresult_class);
264 is_socket (MonoDomain *domain, MonoClass *klass)
266 check_socket_type_cached (domain, klass, "System.Net.Sockets", "Socket", &domain->socket_class);
270 is_socketasyncresult (MonoDomain *domain, MonoClass *klass)
272 return (klass->nested_in &&
273 is_socket (domain, klass->nested_in) &&
274 !strcmp (klass->name, "SocketAsyncResult"));
278 is_socketasynccall (MonoDomain *domain, MonoClass *klass)
280 return (klass->nested_in &&
281 is_socket (domain, klass->nested_in) &&
282 !strcmp (klass->name, "SocketAsyncCall"));
286 is_appdomainunloaded_exception (MonoDomain *domain, MonoClass *klass)
288 check_corlib_type_cached (domain, klass, "System", "AppDomainUnloadedException", &domain->ad_unloaded_ex_class);
292 is_sd_process (MonoDomain *domain, MonoClass *klass)
294 check_system_type_cached (domain, klass, "System.Diagnostics", "Process", &domain->process_class);
298 is_sdp_asyncreadhandler (MonoDomain *domain, MonoClass *klass)
301 return (klass->nested_in &&
302 is_sd_process (domain, klass->nested_in) &&
303 !strcmp (klass->name, "AsyncReadHandler"));
307 #ifdef DISABLE_SOCKETS
309 #define socket_io_cleanup(x)
312 get_event_from_state (MonoSocketAsyncResult *state)
314 g_assert_not_reached ();
319 get_events_from_list (MonoMList *list)
327 socket_io_cleanup (SocketIOData *data)
329 EnterCriticalSection (&data->io_lock);
330 if (data->inited != 2) {
331 LeaveCriticalSection (&data->io_lock);
335 data->shutdown (data->event_data);
336 LeaveCriticalSection (&data->io_lock);
340 get_event_from_state (MonoSocketAsyncResult *state)
342 switch (state->operation) {
345 case AIO_OP_RECV_JUST_CALLBACK:
346 case AIO_OP_RECEIVEFROM:
347 case AIO_OP_READPIPE:
348 case AIO_OP_ACCEPTRECEIVE:
349 case AIO_OP_RECEIVE_BUFFERS:
352 case AIO_OP_SEND_JUST_CALLBACK:
355 case AIO_OP_SEND_BUFFERS:
356 case AIO_OP_DISCONNECT:
358 default: /* Should never happen */
359 g_message ("get_event_from_state: unknown value in switch!!!");
365 get_events_from_list (MonoMList *list)
367 MonoSocketAsyncResult *state;
370 while (list && (state = (MonoSocketAsyncResult *)mono_mlist_get_data (list))) {
371 events |= get_event_from_state (state);
372 list = mono_mlist_next (list);
378 #define ICALL_RECV(x) ves_icall_System_Net_Sockets_Socket_Receive_internal (\
379 (SOCKET)(gssize)x->handle, x->buffer, x->offset, x->size,\
380 x->socket_flags, &x->error);
382 #define ICALL_SEND(x) ves_icall_System_Net_Sockets_Socket_Send_internal (\
383 (SOCKET)(gssize)x->handle, x->buffer, x->offset, x->size,\
384 x->socket_flags, &x->error);
386 #endif /* !DISABLE_SOCKETS */
389 threadpool_jobs_inc (MonoObject *obj)
392 InterlockedIncrement (&obj->vtable->domain->threadpool_jobs);
396 threadpool_jobs_dec (MonoObject *obj)
398 MonoDomain *domain = obj->vtable->domain;
399 int remaining_jobs = InterlockedDecrement (&domain->threadpool_jobs);
400 if (remaining_jobs == 0 && domain->cleanup_semaphore) {
401 ReleaseSemaphore (domain->cleanup_semaphore, 1, NULL);
408 get_io_event (MonoMList **list, gint event)
418 state = mono_mlist_get_data (current);
419 if (get_event_from_state ((MonoSocketAsyncResult *) state) == event)
424 current = mono_mlist_next (current);
429 mono_mlist_set_next (prev, mono_mlist_next (current));
431 *list = mono_mlist_next (*list);
439 * select/poll wake up when a socket is closed, but epoll just removes
440 * the socket from its internal list without notification.
443 mono_thread_pool_remove_socket (int sock)
446 MonoSocketAsyncResult *state;
449 if (socket_io_data.inited == 0)
452 EnterCriticalSection (&socket_io_data.io_lock);
453 if (socket_io_data.sock_to_state == NULL) {
454 LeaveCriticalSection (&socket_io_data.io_lock);
457 list = mono_g_hash_table_lookup (socket_io_data.sock_to_state, GINT_TO_POINTER (sock));
459 mono_g_hash_table_remove (socket_io_data.sock_to_state, GINT_TO_POINTER (sock));
460 LeaveCriticalSection (&socket_io_data.io_lock);
463 state = (MonoSocketAsyncResult *) mono_mlist_get_data (list);
464 if (state->operation == AIO_OP_RECEIVE)
465 state->operation = AIO_OP_RECV_JUST_CALLBACK;
466 else if (state->operation == AIO_OP_SEND)
467 state->operation = AIO_OP_SEND_JUST_CALLBACK;
469 ares = get_io_event (&list, MONO_POLLIN);
470 threadpool_append_job (&async_io_tp, ares);
472 ares = get_io_event (&list, MONO_POLLOUT);
473 threadpool_append_job (&async_io_tp, ares);
479 init_event_system (SocketIOData *data)
482 if (data->event_system == EPOLL_BACKEND)
483 data->event_data = tp_epoll_init (data);
484 #elif defined(HAVE_KQUEUE)
485 if (data->event_system == KQUEUE_BACKEND)
486 data->event_data = tp_kqueue_init (data);
488 if (data->event_system == POLL_BACKEND)
489 data->event_data = tp_poll_init (data);
493 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 mono_thread_create_internal (mono_get_root_domain (), data->wait, data, TRUE, SMALL_STACK);
523 LeaveCriticalSection (&data->io_lock);
525 threadpool_start_thread (&async_io_tp);
529 socket_io_add (MonoAsyncResult *ares, MonoSocketAsyncResult *state)
532 SocketIOData *data = &socket_io_data;
537 socket_io_init (&socket_io_data);
538 if (mono_runtime_is_shutting_down () || data->inited == 3 || data->sock_to_state == NULL)
540 if (async_tp.pool_status == 2)
543 MONO_OBJECT_SETREF (state, ares, ares);
545 fd = GPOINTER_TO_INT (state->handle);
546 EnterCriticalSection (&data->io_lock);
547 if (data->sock_to_state == NULL) {
548 LeaveCriticalSection (&data->io_lock);
551 list = mono_g_hash_table_lookup (data->sock_to_state, GINT_TO_POINTER (fd));
553 list = mono_mlist_alloc ((MonoObject*)state);
556 list = mono_mlist_append (list, (MonoObject*)state);
560 mono_g_hash_table_replace (data->sock_to_state, state->handle, list);
561 ievt = get_events_from_list (list);
562 LeaveCriticalSection (&data->io_lock);
563 data->modify (data->event_data, fd, state->operation, ievt, is_new);
566 #ifndef DISABLE_SOCKETS
568 socket_io_filter (MonoObject *target, MonoObject *state)
571 MonoSocketAsyncResult *sock_res;
575 if (target == NULL || state == NULL)
578 domain = target->vtable->domain;
579 klass = target->vtable->klass;
580 if (socket_async_call_klass == NULL && is_socketasynccall (domain, klass))
581 socket_async_call_klass = klass;
583 if (process_async_call_klass == NULL && is_sdp_asyncreadhandler (domain, klass))
584 process_async_call_klass = klass;
586 if (klass != socket_async_call_klass && klass != process_async_call_klass)
589 sock_res = (MonoSocketAsyncResult *) state;
590 op = sock_res->operation;
591 if (op < AIO_OP_FIRST || op >= AIO_OP_LAST)
596 #endif /* !DISABLE_SOCKETS */
598 /* Returns the exception thrown when invoking, if any */
600 mono_async_invoke (ThreadPool *tp, MonoAsyncResult *ares)
602 ASyncCall *ac = (ASyncCall *)ares->object_data;
603 MonoObject *res, *exc = NULL;
604 MonoArray *out_args = NULL;
605 HANDLE wait_event = NULL;
607 if (ares->execution_context) {
608 /* use captured ExecutionContext (if available) */
609 MONO_OBJECT_SETREF (ares, original_context, mono_thread_get_execution_context ());
610 mono_thread_set_execution_context (ares->execution_context);
612 ares->original_context = NULL;
616 /* Fast path from ThreadPool.*QueueUserWorkItem */
617 void *pa = ares->async_state;
618 mono_runtime_delegate_invoke (ares->async_delegate, &pa, &exc);
620 MonoObject *cb_exc = NULL;
623 res = mono_message_invoke (ares->async_delegate, ac->msg, &exc, &out_args);
624 MONO_OBJECT_SETREF (ac, res, res);
625 MONO_OBJECT_SETREF (ac, msg->exc, exc);
626 MONO_OBJECT_SETREF (ac, out_args, out_args);
628 mono_monitor_enter ((MonoObject *) ares);
630 if (ares->handle != NULL)
631 wait_event = mono_wait_handle_get_handle ((MonoWaitHandle *) ares->handle);
632 mono_monitor_exit ((MonoObject *) ares);
633 /* notify listeners */
634 if (wait_event != NULL)
635 SetEvent (wait_event);
637 /* call async callback if cb_method != null*/
638 if (ac != NULL && ac->cb_method) {
641 mono_runtime_invoke (ac->cb_method, ac->cb_target, pa, &cb_exc);
642 MONO_OBJECT_SETREF (ac->msg, exc, cb_exc);
649 /* restore original thread execution context if flow isn't suppressed, i.e. non null */
650 if (ares->original_context) {
651 mono_thread_set_execution_context (ares->original_context);
652 ares->original_context = NULL;
658 threadpool_start_idle_threads (ThreadPool *tp)
663 stack_size = (!tp->is_io) ? 0 : SMALL_STACK;
667 if (n >= tp->min_threads)
669 if (InterlockedCompareExchange (&tp->nthreads, n + 1, n) == n)
672 mono_perfcounter_update_value (tp->pc_nthreads, TRUE, 1);
673 mono_thread_create_internal (mono_get_root_domain (), tp->async_invoke, tp, TRUE, stack_size);
679 threadpool_init (ThreadPool *tp, int min_threads, int max_threads, void (*async_invoke) (gpointer))
681 memset (tp, 0, sizeof (ThreadPool));
682 tp->min_threads = min_threads;
683 tp->max_threads = max_threads;
684 tp->async_invoke = async_invoke;
685 tp->queue = mono_cq_create ();
686 MONO_SEM_INIT (&tp->new_job, 0);
690 init_perf_counter (const char *category, const char *counter)
692 MonoString *category_str;
693 MonoString *counter_str;
699 if (category == NULL || counter == NULL)
701 root = mono_get_root_domain ();
702 category_str = mono_string_new (root, category);
703 counter_str = mono_string_new (root, counter);
704 machine = mono_string_new (root, ".");
705 return mono_perfcounter_get_impl (category_str, counter_str, NULL, machine, &type, &custom);
710 print_pool_info (ThreadPool *tp)
713 // if (tp->tail - tp->head == 0)
716 g_print ("Pool status? %d\n", InterlockedCompareExchange (&tp->pool_status, 0, 0));
717 g_print ("Min. threads: %d\n", InterlockedCompareExchange (&tp->min_threads, 0, 0));
718 g_print ("Max. threads: %d\n", InterlockedCompareExchange (&tp->max_threads, 0, 0));
719 g_print ("nthreads: %d\n", InterlockedCompareExchange (&tp->nthreads, 0, 0));
720 g_print ("busy threads: %d\n", InterlockedCompareExchange (&tp->busy_threads, 0, 0));
721 g_print ("Waiting: %d\n", InterlockedCompareExchange (&tp->waiting, 0, 0));
722 g_print ("Queued: %d\n", (tp->tail - tp->head));
723 if (tp == &async_tp) {
725 EnterCriticalSection (&wsqs_lock);
726 for (i = 0; i < wsqs->len; i++) {
727 g_print ("\tWSQ %d: %d\n", i, mono_wsq_count (g_ptr_array_index (wsqs, i)));
729 LeaveCriticalSection (&wsqs_lock);
731 g_print ("\tSockets: %d\n", mono_g_hash_table_size (socket_io_data.sock_to_state));
733 g_print ("-------------\n");
737 signal_handler (int signo)
742 g_print ("\n-----Non-IO-----\n");
743 print_pool_info (tp);
745 g_print ("\n-----IO-----\n");
746 print_pool_info (tp);
752 monitor_thread (gpointer unused)
754 ThreadPool *pools [2];
755 MonoInternalThread *thread;
760 pools [0] = &async_tp;
761 pools [1] = &async_io_tp;
762 thread = mono_thread_internal_current ();
763 ves_icall_System_Threading_Thread_SetName_internal (thread, mono_string_new (mono_domain_get (), "Threadpool monitor"));
768 ts = mono_msec_ticks ();
769 if (SleepEx (ms, TRUE) == 0)
771 ms -= (mono_msec_ticks () - ts);
772 if (mono_runtime_is_shutting_down ())
774 if (THREAD_WANTS_A_BREAK (thread))
775 mono_thread_interruption_checkpoint ();
778 if (mono_runtime_is_shutting_down ())
781 for (i = 0; i < 2; i++) {
786 need_one = (mono_cq_count (tp->queue) > 0);
787 if (!need_one && !tp->is_io) {
788 EnterCriticalSection (&wsqs_lock);
789 for (i = 0; wsqs != NULL && i < wsqs->len; i++) {
791 wsq = g_ptr_array_index (wsqs, i);
792 if (mono_wsq_count (wsq) != 0) {
797 LeaveCriticalSection (&wsqs_lock);
800 threadpool_start_thread (tp);
806 mono_thread_pool_init ()
808 gint threads_per_cpu = 1;
810 gint cpu_count = mono_cpu_count ();
816 result = InterlockedCompareExchange (&tp_inited, 1, 0);
825 MONO_GC_REGISTER_ROOT_FIXED (socket_io_data.sock_to_state);
826 InitializeCriticalSection (&socket_io_data.io_lock);
827 if (g_getenv ("MONO_THREADS_PER_CPU") != NULL) {
828 threads_per_cpu = atoi (g_getenv ("MONO_THREADS_PER_CPU"));
829 if (threads_per_cpu < 1)
833 thread_count = MIN (cpu_count * threads_per_cpu, 100 * cpu_count);
834 threadpool_init (&async_tp, thread_count, MAX (100 * cpu_count, thread_count), async_invoke_thread);
835 threadpool_init (&async_io_tp, cpu_count * 2, cpu_count * 4, async_invoke_thread);
836 async_io_tp.is_io = TRUE;
838 async_call_klass = mono_class_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
839 g_assert (async_call_klass);
841 InitializeCriticalSection (&wsqs_lock);
842 wsqs = g_ptr_array_sized_new (MAX (100 * cpu_count, thread_count));
845 async_tp.pc_nitems = init_perf_counter ("Mono Threadpool", "Work Items Added");
846 g_assert (async_tp.pc_nitems);
848 async_io_tp.pc_nitems = init_perf_counter ("Mono Threadpool", "IO Work Items Added");
849 g_assert (async_io_tp.pc_nitems);
851 async_tp.pc_nthreads = init_perf_counter ("Mono Threadpool", "# of Threads");
852 g_assert (async_tp.pc_nthreads);
854 async_io_tp.pc_nthreads = init_perf_counter ("Mono Threadpool", "# of IO Threads");
855 g_assert (async_io_tp.pc_nthreads);
858 signal (SIGALRM, signal_handler);
863 static MonoAsyncResult *
864 create_simple_asyncresult (MonoObject *target, MonoObject *state)
866 MonoDomain *domain = mono_domain_get ();
867 MonoAsyncResult *ares;
869 /* Don't call mono_async_result_new() to avoid capturing the context */
870 ares = (MonoAsyncResult *) mono_object_new (domain, mono_defaults.asyncresult_class);
871 MONO_OBJECT_SETREF (ares, async_delegate, target);
872 MONO_OBJECT_SETREF (ares, async_state, state);
877 icall_append_io_job (MonoObject *target, MonoSocketAsyncResult *state)
879 MonoAsyncResult *ares;
881 ares = create_simple_asyncresult (target, (MonoObject *) state);
882 socket_io_add (ares, state);
886 mono_thread_pool_add (MonoObject *target, MonoMethodMessage *msg, MonoDelegate *async_callback,
889 MonoDomain *domain = mono_domain_get ();
890 MonoAsyncResult *ares;
893 ac = (ASyncCall*)mono_object_new (domain, async_call_klass);
894 MONO_OBJECT_SETREF (ac, msg, msg);
895 MONO_OBJECT_SETREF (ac, state, state);
897 if (async_callback) {
898 ac->cb_method = mono_get_delegate_invoke (((MonoObject *)async_callback)->vtable->klass);
899 MONO_OBJECT_SETREF (ac, cb_target, async_callback);
902 ares = mono_async_result_new (domain, NULL, ac->state, NULL, (MonoObject*)ac);
903 MONO_OBJECT_SETREF (ares, async_delegate, target);
905 #ifndef DISABLE_SOCKETS
906 if (socket_io_filter (target, state)) {
907 socket_io_add (ares, (MonoSocketAsyncResult *) state);
911 threadpool_append_job (&async_tp, (MonoObject *) ares);
916 mono_thread_pool_finish (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc)
924 /* check if already finished */
925 mono_monitor_enter ((MonoObject *) ares);
927 if (ares->endinvoke_called) {
928 *exc = (MonoObject *) mono_get_exception_invalid_operation (NULL);
929 mono_monitor_exit ((MonoObject *) ares);
933 ares->endinvoke_called = 1;
934 /* wait until we are really finished */
935 if (!ares->completed) {
936 if (ares->handle == NULL) {
937 wait_event = CreateEvent (NULL, TRUE, FALSE, NULL);
938 g_assert(wait_event != 0);
939 MONO_OBJECT_SETREF (ares, handle, (MonoObject *) mono_wait_handle_new (mono_object_domain (ares), wait_event));
941 wait_event = mono_wait_handle_get_handle ((MonoWaitHandle *) ares->handle);
943 mono_monitor_exit ((MonoObject *) ares);
944 WaitForSingleObjectEx (wait_event, INFINITE, TRUE);
946 mono_monitor_exit ((MonoObject *) ares);
949 ac = (ASyncCall *) ares->object_data;
950 g_assert (ac != NULL);
951 *exc = ac->msg->exc; /* FIXME: GC add write barrier */
952 *out_args = ac->out_args;
958 threadpool_kill_idle_threads (ThreadPool *tp)
962 n = (gint) InterlockedCompareExchange (&tp->max_threads, 0, -1);
965 MONO_SEM_POST (&tp->new_job);
970 mono_thread_pool_cleanup (void)
972 if (InterlockedExchange (&async_io_tp.pool_status, 2) == 1) {
973 socket_io_cleanup (&socket_io_data); /* Empty when DISABLE_SOCKETS is defined */
974 threadpool_kill_idle_threads (&async_io_tp);
977 if (async_io_tp.queue != NULL) {
978 MONO_SEM_DESTROY (&async_io_tp.new_job);
979 threadpool_free_queue (&async_io_tp);
983 if (InterlockedExchange (&async_tp.pool_status, 2) == 1) {
984 threadpool_kill_idle_threads (&async_tp);
985 threadpool_free_queue (&async_tp);
989 EnterCriticalSection (&wsqs_lock);
992 g_ptr_array_free (wsqs, TRUE);
994 LeaveCriticalSection (&wsqs_lock);
995 MONO_SEM_DESTROY (&async_tp.new_job);
1000 threadpool_start_thread (ThreadPool *tp)
1005 stack_size = (!tp->is_io) ? 0 : SMALL_STACK;
1006 while (!mono_runtime_is_shutting_down () && (n = tp->nthreads) < tp->max_threads) {
1007 if (InterlockedCompareExchange (&tp->nthreads, n + 1, n) == n) {
1008 mono_perfcounter_update_value (tp->pc_nthreads, TRUE, 1);
1009 mono_thread_create_internal (mono_get_root_domain (), tp->async_invoke, tp, TRUE, stack_size);
1018 pulse_on_new_job (ThreadPool *tp)
1021 MONO_SEM_POST (&tp->new_job);
1025 icall_append_job (MonoObject *ar)
1027 threadpool_append_jobs (&async_tp, &ar, 1);
1031 threadpool_append_job (ThreadPool *tp, MonoObject *ar)
1033 threadpool_append_jobs (tp, &ar, 1);
1037 threadpool_append_jobs (ThreadPool *tp, MonoObject **jobs, gint njobs)
1039 static int job_counter;
1043 if (mono_runtime_is_shutting_down ())
1046 if (tp->pool_status == 0 && InterlockedCompareExchange (&tp->pool_status, 1, 0) == 0) {
1048 mono_thread_create_internal (mono_get_root_domain (), monitor_thread, NULL, TRUE, SMALL_STACK);
1049 /* Create on demand up to min_threads to avoid startup penalty for apps that don't use
1050 * the threadpool that much
1051 * mono_thread_create_internal (mono_get_root_domain (), threadpool_start_idle_threads, tp, TRUE, SMALL_STACK);
1055 for (i = 0; i < njobs; i++) {
1057 if (ar == NULL || mono_domain_is_unloading (ar->vtable->domain))
1058 continue; /* Might happen when cleaning domain jobs */
1059 if (!tp->is_io && (InterlockedIncrement (&job_counter) % 10) == 0) {
1060 MonoAsyncResult *o = (MonoAsyncResult *) ar;
1061 o->add_time = mono_100ns_ticks ();
1063 threadpool_jobs_inc (ar);
1064 mono_perfcounter_update_value (tp->pc_nitems, TRUE, 1);
1065 if (!tp->is_io && mono_wsq_local_push (ar))
1068 mono_cq_enqueue (tp->queue, ar);
1071 for (i = 0; tp->waiting > 0 && i < MIN(njobs, tp->max_threads); i++)
1072 pulse_on_new_job (tp);
1076 threadpool_clear_queue (ThreadPool *tp, MonoDomain *domain)
1082 while (mono_cq_dequeue (tp->queue, &obj)) {
1085 if (obj->vtable->domain != domain)
1086 other = mono_mlist_prepend (other, obj);
1087 threadpool_jobs_dec (obj);
1091 threadpool_append_job (tp, (MonoObject *) mono_mlist_get_data (other));
1092 other = mono_mlist_next (other);
1097 * Clean up the threadpool of all domain jobs.
1098 * Can only be called as part of the domain unloading process as
1099 * it will wait for all jobs to be visible to the interruption code.
1102 mono_thread_pool_remove_domain_jobs (MonoDomain *domain, int timeout)
1106 guint32 start_time = 0;
1108 g_assert (domain->state == MONO_APPDOMAIN_UNLOADING);
1110 threadpool_clear_queue (&async_tp, domain);
1111 threadpool_clear_queue (&async_io_tp, domain);
1114 * There might be some threads out that could be about to execute stuff from the given domain.
1115 * We avoid that by setting up a semaphore to be pulsed by the thread that reaches zero.
1117 sem_handle = CreateSemaphore (NULL, 0, 1, NULL);
1119 domain->cleanup_semaphore = sem_handle;
1121 * The memory barrier here is required to have global ordering between assigning to cleanup_semaphone
1122 * and reading threadpool_jobs.
1123 * Otherwise this thread could read a stale version of threadpool_jobs and wait forever.
1125 mono_memory_write_barrier ();
1127 if (domain->threadpool_jobs && timeout != -1)
1128 start_time = mono_msec_ticks ();
1129 while (domain->threadpool_jobs) {
1130 WaitForSingleObject (sem_handle, timeout);
1131 if (timeout != -1 && (mono_msec_ticks () - start_time) > timeout) {
1137 domain->cleanup_semaphore = NULL;
1138 CloseHandle (sem_handle);
1143 threadpool_free_queue (ThreadPool *tp)
1145 mono_cq_destroy (tp->queue);
1150 mono_thread_pool_is_queue_array (MonoArray *o)
1152 // gpointer obj = o;
1154 // FIXME: need some fix in sgen code.
1164 EnterCriticalSection (&wsqs_lock);
1165 wsq = mono_wsq_create ();
1167 LeaveCriticalSection (&wsqs_lock);
1170 for (i = 0; i < wsqs->len; i++) {
1171 if (g_ptr_array_index (wsqs, i) == NULL) {
1172 wsqs->pdata [i] = wsq;
1173 LeaveCriticalSection (&wsqs_lock);
1177 g_ptr_array_add (wsqs, wsq);
1178 LeaveCriticalSection (&wsqs_lock);
1183 remove_wsq (MonoWSQ *wsq)
1190 EnterCriticalSection (&wsqs_lock);
1192 LeaveCriticalSection (&wsqs_lock);
1195 g_ptr_array_remove_fast (wsqs, wsq);
1198 * Only clean this up when shutting down, any other case will error out
1199 * if we're removing a queue that still has work items.
1201 if (mono_runtime_is_shutting_down ()) {
1202 while (mono_wsq_local_pop (&data)) {
1203 threadpool_jobs_dec (data);
1207 mono_wsq_destroy (wsq);
1208 LeaveCriticalSection (&wsqs_lock);
1212 try_steal (MonoWSQ *local_wsq, gpointer *data, gboolean retry)
1217 if (wsqs == NULL || data == NULL || *data != NULL)
1222 if (mono_runtime_is_shutting_down ())
1225 EnterCriticalSection (&wsqs_lock);
1226 for (i = 0; wsqs != NULL && i < wsqs->len; i++) {
1229 wsq = wsqs->pdata [i];
1230 if (wsq == local_wsq || mono_wsq_count (wsq) == 0)
1232 mono_wsq_try_steal (wsqs->pdata [i], data, ms);
1233 if (*data != NULL) {
1234 LeaveCriticalSection (&wsqs_lock);
1238 LeaveCriticalSection (&wsqs_lock);
1240 } while (retry && ms < 11);
1244 dequeue_or_steal (ThreadPool *tp, gpointer *data, MonoWSQ *local_wsq)
1246 if (mono_runtime_is_shutting_down ())
1248 mono_cq_dequeue (tp->queue, (MonoObject **) data);
1249 if (!tp->is_io && !*data)
1250 try_steal (local_wsq, data, FALSE);
1251 return (*data != NULL);
1255 process_idle_times (ThreadPool *tp, gint64 t)
1259 gboolean compute_avg;
1263 if (tp->ignore_times || t <= 0)
1266 compute_avg = FALSE;
1267 ticks = mono_100ns_ticks ();
1269 SPIN_LOCK (tp->sp_lock);
1270 if (tp->ignore_times) {
1271 SPIN_UNLOCK (tp->sp_lock);
1276 if (tp->last_check == 0)
1277 tp->last_check = ticks;
1278 else if (tp->last_check > 0 && (ticks - tp->last_check) > 5000000) {
1279 tp->ignore_times = 1;
1282 SPIN_UNLOCK (tp->sp_lock);
1287 //printf ("Items: %d Time elapsed: %.3fs\n", tp->n_sum, (ticks - tp->last_check) / 10000.0);
1288 tp->last_check = ticks;
1290 avg = tp->time_sum / tp->n_sum;
1291 if (tp->averages [1] == 0) {
1292 tp->averages [1] = avg;
1294 per1 = ((100 * (ABS (avg - tp->averages [1]))) / tp->averages [1]);
1296 if (avg > tp->averages [1]) {
1297 if (tp->averages [1] < tp->averages [0]) {
1302 } else if (avg < tp->averages [1] && tp->averages [1] < tp->averages [0]) {
1307 min = tp->min_threads;
1309 if ((n - min) < min && tp->busy_threads == n)
1313 if (new_threads != 0) {
1314 printf ("n: %d per1: %lld avg=%lld avg1=%lld avg0=%lld\n", new_threads, per1, avg, tp->averages [1], tp->averages [0]);
1322 tp->averages [0] = tp->averages [1];
1323 tp->averages [1] = avg;
1324 tp->ignore_times = 0;
1326 if (new_threads == -1) {
1327 if (tp->destroy_thread == 0 && InterlockedCompareExchange (&tp->destroy_thread, 1, 0) == 0)
1328 pulse_on_new_job (tp);
1333 should_i_die (ThreadPool *tp)
1335 gboolean result = FALSE;
1336 if (tp->destroy_thread == 1 && InterlockedCompareExchange (&tp->destroy_thread, 0, 1) == 1)
1337 result = (tp->nthreads > tp->min_threads);
1342 async_invoke_thread (gpointer data)
1345 MonoInternalThread *thread;
1356 thread = mono_thread_internal_current ();
1358 mono_profiler_thread_start (thread->tid);
1359 name = (tp->is_io) ? "IO Threadpool worker" : "Threadpool worker";
1360 ves_icall_System_Threading_Thread_SetName_internal (thread, mono_string_new (mono_domain_get (), name));
1363 tp_start_func (tp_hooks_user_data);
1367 MonoAsyncResult *ar;
1369 gboolean is_io_task;
1374 ar = (MonoAsyncResult *) data;
1376 InterlockedIncrement (&tp->busy_threads);
1377 domain = ((MonoObject *)ar)->vtable->domain;
1378 #ifndef DISABLE_SOCKETS
1379 klass = ((MonoObject *) data)->vtable->klass;
1380 is_io_task = !is_corlib_asyncresult (domain, klass);
1383 MonoSocketAsyncResult *state = (MonoSocketAsyncResult *) data;
1384 is_socket = is_socketasyncresult (domain, klass);
1386 switch (state->operation) {
1387 case AIO_OP_RECEIVE:
1388 state->total = ICALL_RECV (state);
1391 state->total = ICALL_SEND (state);
1396 /* worker threads invokes methods in different domains,
1397 * so we need to set the right domain here */
1400 if (mono_domain_is_unloading (domain) || mono_runtime_is_shutting_down ()) {
1401 threadpool_jobs_dec ((MonoObject *)ar);
1404 InterlockedDecrement (&tp->busy_threads);
1406 mono_thread_push_appdomain_ref (domain);
1407 if (threadpool_jobs_dec ((MonoObject *)ar)) {
1410 mono_thread_pop_appdomain_ref ();
1411 InterlockedDecrement (&tp->busy_threads);
1415 if (mono_domain_set (domain, FALSE)) {
1418 if (tp_item_begin_func)
1419 tp_item_begin_func (tp_item_user_data);
1421 if (!is_io_task && ar->add_time > 0)
1422 process_idle_times (tp, ar->add_time);
1423 exc = mono_async_invoke (tp, ar);
1424 if (tp_item_end_func)
1425 tp_item_end_func (tp_item_user_data);
1426 if (exc && mono_runtime_unhandled_exception_policy_get () == MONO_UNHANDLED_POLICY_CURRENT) {
1430 klass = exc->vtable->klass;
1431 unloaded = is_appdomainunloaded_exception (exc->vtable->domain, klass);
1432 if (!unloaded && klass != mono_defaults.threadabortexception_class) {
1433 mono_unhandled_exception (exc);
1436 if (klass == mono_defaults.threadabortexception_class)
1437 mono_thread_internal_reset_abort (thread);
1439 if (is_socket && tp->is_io) {
1440 MonoSocketAsyncResult *state = (MonoSocketAsyncResult *) data;
1442 if (state->completed && state->callback) {
1443 MonoAsyncResult *cb_ares;
1444 cb_ares = create_simple_asyncresult ((MonoObject *) state->callback,
1445 (MonoObject *) state);
1446 icall_append_job ((MonoObject *) cb_ares);
1449 mono_domain_set (mono_get_root_domain (), TRUE);
1451 mono_thread_pop_appdomain_ref ();
1452 InterlockedDecrement (&tp->busy_threads);
1453 /* If the callee changes the background status, set it back to TRUE */
1454 mono_thread_clr_state (thread , ~ThreadState_Background);
1455 if (!mono_thread_test_state (thread , ThreadState_Background))
1456 ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background);
1462 must_die = should_i_die (tp);
1463 if (!must_die && (tp->is_io || !mono_wsq_local_pop (&data)))
1464 dequeue_or_steal (tp, &data, wsq);
1467 while (!must_die && !data && n_naps < 4) {
1470 InterlockedIncrement (&tp->waiting);
1471 #if defined(__OpenBSD__)
1472 while ((res = mono_sem_wait (&tp->new_job, TRUE)) == -1) {// && errno == EINTR) {
1474 while ((res = mono_sem_timedwait (&tp->new_job, 2000, TRUE)) == -1) {// && errno == EINTR) {
1476 if (mono_runtime_is_shutting_down ())
1478 if (THREAD_WANTS_A_BREAK (thread))
1479 mono_thread_interruption_checkpoint ();
1481 InterlockedDecrement (&tp->waiting);
1482 if (mono_runtime_is_shutting_down ())
1484 must_die = should_i_die (tp);
1485 dequeue_or_steal (tp, &data, wsq);
1489 if (!data && !tp->is_io && !mono_runtime_is_shutting_down ()) {
1490 mono_wsq_local_pop (&data);
1491 if (data && must_die) {
1492 InterlockedCompareExchange (&tp->destroy_thread, 1, 0);
1493 pulse_on_new_job (tp);
1502 down = mono_runtime_is_shutting_down ();
1503 if (!down && nt <= tp->min_threads)
1505 if (down || InterlockedCompareExchange (&tp->nthreads, nt - 1, nt) == nt) {
1506 mono_perfcounter_update_value (tp->pc_nthreads, TRUE, -1);
1511 mono_profiler_thread_end (thread->tid);
1514 tp_finish_func (tp_hooks_user_data);
1521 g_assert_not_reached ();
1525 ves_icall_System_Threading_ThreadPool_GetAvailableThreads (gint *workerThreads, gint *completionPortThreads)
1527 *workerThreads = async_tp.max_threads - async_tp.busy_threads;
1528 *completionPortThreads = async_io_tp.max_threads - async_io_tp.busy_threads;
1532 ves_icall_System_Threading_ThreadPool_GetMaxThreads (gint *workerThreads, gint *completionPortThreads)
1534 *workerThreads = async_tp.max_threads;
1535 *completionPortThreads = async_io_tp.max_threads;
1539 ves_icall_System_Threading_ThreadPool_GetMinThreads (gint *workerThreads, gint *completionPortThreads)
1541 *workerThreads = async_tp.min_threads;
1542 *completionPortThreads = async_io_tp.min_threads;
1546 ves_icall_System_Threading_ThreadPool_SetMinThreads (gint workerThreads, gint completionPortThreads)
1549 gint max_io_threads;
1551 max_threads = async_tp.max_threads;
1552 if (workerThreads <= 0 || workerThreads > max_threads)
1555 max_io_threads = async_io_tp.max_threads;
1556 if (completionPortThreads <= 0 || completionPortThreads > max_io_threads)
1559 InterlockedExchange (&async_tp.min_threads, workerThreads);
1560 InterlockedExchange (&async_io_tp.min_threads, completionPortThreads);
1561 if (workerThreads > async_tp.nthreads)
1562 mono_thread_create_internal (mono_get_root_domain (), threadpool_start_idle_threads, &async_tp, TRUE, SMALL_STACK);
1563 if (completionPortThreads > async_io_tp.nthreads)
1564 mono_thread_create_internal (mono_get_root_domain (), threadpool_start_idle_threads, &async_io_tp, TRUE, SMALL_STACK);
1569 ves_icall_System_Threading_ThreadPool_SetMaxThreads (gint workerThreads, gint completionPortThreads)
1572 gint min_io_threads;
1575 cpu_count = mono_cpu_count ();
1576 min_threads = async_tp.min_threads;
1577 if (workerThreads < min_threads || workerThreads < cpu_count)
1580 /* We don't really have the concept of completion ports. Do we care here? */
1581 min_io_threads = async_io_tp.min_threads;
1582 if (completionPortThreads < min_io_threads || completionPortThreads < cpu_count)
1585 InterlockedExchange (&async_tp.max_threads, workerThreads);
1586 InterlockedExchange (&async_io_tp.max_threads, completionPortThreads);
1591 * mono_install_threadpool_thread_hooks
1592 * @start_func: the function to be called right after a new threadpool thread is created. Can be NULL.
1593 * @finish_func: the function to be called right before a thredpool thread is exiting. Can be NULL.
1594 * @user_data: argument passed to @start_func and @finish_func.
1596 * @start_fun will be called right after a threadpool thread is created and @finish_func right before a threadpool thread exits.
1597 * The calls will be made from the thread itself.
1600 mono_install_threadpool_thread_hooks (MonoThreadPoolFunc start_func, MonoThreadPoolFunc finish_func, gpointer user_data)
1602 tp_start_func = start_func;
1603 tp_finish_func = finish_func;
1604 tp_hooks_user_data = user_data;
1608 * mono_install_threadpool_item_hooks
1609 * @begin_func: the function to be called before a threadpool work item processing starts.
1610 * @end_func: the function to be called after a threadpool work item is finished.
1611 * @user_data: argument passed to @begin_func and @end_func.
1613 * The calls will be made from the thread itself and from the same AppDomain
1614 * where the work item was executed.
1618 mono_install_threadpool_item_hooks (MonoThreadPoolItemFunc begin_func, MonoThreadPoolItemFunc end_func, gpointer user_data)
1620 tp_item_begin_func = begin_func;
1621 tp_item_end_func = end_func;
1622 tp_item_user_data = user_data;