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/metadata/mono-ptr-array.h>
26 #include <mono/io-layer/io-layer.h>
27 #include <mono/utils/mono-time.h>
28 #include <mono/utils/mono-proclib.h>
29 #include <mono/utils/mono-semaphore.h>
31 #ifdef HAVE_SYS_TIME_H
34 #include <sys/types.h>
40 #ifdef HAVE_SYS_SOCKET_H
41 #include <sys/socket.h>
43 #include <mono/utils/mono-poll.h>
45 #include <sys/epoll.h>
48 #include <sys/event.h>
52 #ifndef DISABLE_SOCKETS
53 #include "mono/io-layer/socket-wrappers.h"
56 #include "threadpool.h"
58 #define THREAD_WANTS_A_BREAK(t) ((t->state & (ThreadState_StopRequested | \
59 ThreadState_SuspendRequested)) != 0)
61 #define SPIN_TRYLOCK(i) (InterlockedCompareExchange (&(i), 1, 0) == 0)
62 #define SPIN_LOCK(i) do { \
63 if (SPIN_TRYLOCK (i)) \
67 #define SPIN_UNLOCK(i) i = 0
68 #define SMALL_STACK (128 * (sizeof (gpointer) / 4) * 1024)
70 /* DEBUG: prints tp data every 2s */
73 /* mono_thread_pool_init called */
74 static volatile int tp_inited;
83 CRITICAL_SECTION io_lock; /* access to sock_to_state */
84 int inited; // 0 -> not initialized , 1->initializing, 2->initialized, 3->cleaned up
85 MonoGHashTable *sock_to_state;
89 void (*modify) (gpointer event_data, int fd, int operation, int events, gboolean is_new);
90 void (*wait) (gpointer sock_data);
91 void (*shutdown) (gpointer event_data);
94 static SocketIOData socket_io_data;
96 /* Keep in sync with the System.MonoAsyncCall class which provides GC tracking */
99 MonoMethodMessage *msg;
100 MonoMethod *cb_method;
101 MonoDelegate *cb_target;
109 MonoCQ *queue; /* GC root */
111 volatile gint waiting; /* threads waiting for a work item */
114 volatile gint pool_status; /* 0 -> not initialized, 1 -> initialized, 2 -> cleaning up */
115 /* min, max, n and busy -> Interlocked */
116 volatile gint min_threads;
117 volatile gint max_threads;
118 volatile gint nthreads;
119 volatile gint busy_threads;
121 void (*async_invoke) (gpointer data);
122 void *pc_nitems; /* Performance counter for total number of items in added */
123 void *pc_nthreads; /* Performance counter for total number of active threads */
125 volatile gint destroy_thread;
126 volatile gint ignore_times; /* Used when there's a thread being created or destroyed */
127 volatile gint sp_lock; /* spin lock used to protect ignore_times */
128 volatile gint64 last_check;
129 volatile gint64 time_sum;
135 static ThreadPool async_tp;
136 static ThreadPool async_io_tp;
138 static void async_invoke_thread (gpointer data);
139 static MonoObject *mono_async_invoke (ThreadPool *tp, MonoAsyncResult *ares);
140 static void threadpool_free_queue (ThreadPool *tp);
141 static void threadpool_append_job (ThreadPool *tp, MonoObject *ar);
142 static void threadpool_append_jobs (ThreadPool *tp, MonoObject **jobs, gint njobs);
143 static void threadpool_init (ThreadPool *tp, int min_threads, int max_threads, void (*async_invoke) (gpointer));
144 static void threadpool_start_idle_threads (ThreadPool *tp);
145 static void threadpool_kill_idle_threads (ThreadPool *tp);
146 static gboolean threadpool_start_thread (ThreadPool *tp);
147 static void monitor_thread (gpointer data);
148 static void socket_io_cleanup (SocketIOData *data);
149 static MonoObject *get_io_event (MonoMList **list, gint event);
150 static int get_events_from_list (MonoMList *list);
151 static int get_event_from_state (MonoSocketAsyncResult *state);
153 static MonoClass *async_call_klass;
154 static MonoClass *socket_async_call_klass;
155 static MonoClass *process_async_call_klass;
157 static GPtrArray *wsqs;
158 CRITICAL_SECTION wsqs_lock;
161 static MonoThreadPoolFunc tp_start_func;
162 static MonoThreadPoolFunc tp_finish_func;
163 static gpointer tp_hooks_user_data;
164 static MonoThreadPoolItemFunc tp_item_begin_func;
165 static MonoThreadPoolItemFunc tp_item_end_func;
166 static gpointer tp_item_user_data;
176 AIO_OP_RECV_JUST_CALLBACK,
177 AIO_OP_SEND_JUST_CALLBACK,
181 AIO_OP_ACCEPTRECEIVE,
182 AIO_OP_RECEIVE_BUFFERS,
187 #include <mono/metadata/tpool-poll.c>
189 #include <mono/metadata/tpool-epoll.c>
190 #elif defined(HAVE_KQUEUE)
191 #include <mono/metadata/tpool-kqueue.c>
194 * Functions to check whenever a class is given system class. We need to cache things in MonoDomain since some of the
195 * assemblies can be unloaded.
199 is_system_type (MonoDomain *domain, MonoClass *klass)
201 if (domain->system_image == NULL)
202 domain->system_image = mono_image_loaded ("System");
204 return klass->image == domain->system_image;
208 is_corlib_type (MonoDomain *domain, MonoClass *klass)
210 return klass->image == mono_defaults.corlib;
214 * Note that we call it is_socket_type() where 'socket' refers to the image
215 * that contains the System.Net.Sockets.Socket type.
216 * For moonlight there is a System.Net.Sockets.Socket class in both System.dll and System.Net.dll.
219 is_socket_type (MonoDomain *domain, MonoClass *klass)
221 static const char *version = NULL;
222 static gboolean moonlight;
224 if (is_system_type (domain, klass))
227 /* If moonlight, check if the type is in System.Net.dll too */
228 if (version == NULL) {
229 version = mono_get_runtime_info ()->framework_version;
230 moonlight = !strcmp (version, "2.1");
236 if (domain->system_net_dll == NULL)
237 domain->system_net_dll = mono_image_loaded ("System.Net");
239 return klass->image == domain->system_net_dll;
242 #define check_type_cached(domain, ASSEMBLY, _class, _namespace, _name, loc) do { \
244 return *loc == _class; \
245 if (is_##ASSEMBLY##_type (domain, _class) && !strcmp (_name, _class->name) && !strcmp (_namespace, _class->name_space)) { \
252 #define check_corlib_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, corlib, _class, _namespace, _name, loc)
254 #define check_socket_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, socket, _class, _namespace, _name, loc)
256 #define check_system_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, system, _class, _namespace, _name, loc)
259 is_corlib_asyncresult (MonoDomain *domain, MonoClass *klass)
261 check_corlib_type_cached (domain, klass, "System.Runtime.Remoting.Messaging", "AsyncResult", &domain->corlib_asyncresult_class);
265 is_socket (MonoDomain *domain, MonoClass *klass)
267 check_socket_type_cached (domain, klass, "System.Net.Sockets", "Socket", &domain->socket_class);
271 is_socketasyncresult (MonoDomain *domain, MonoClass *klass)
273 return (klass->nested_in &&
274 is_socket (domain, klass->nested_in) &&
275 !strcmp (klass->name, "SocketAsyncResult"));
279 is_socketasynccall (MonoDomain *domain, MonoClass *klass)
281 return (klass->nested_in &&
282 is_socket (domain, klass->nested_in) &&
283 !strcmp (klass->name, "SocketAsyncCall"));
287 is_appdomainunloaded_exception (MonoDomain *domain, MonoClass *klass)
289 check_corlib_type_cached (domain, klass, "System", "AppDomainUnloadedException", &domain->ad_unloaded_ex_class);
293 is_sd_process (MonoDomain *domain, MonoClass *klass)
295 check_system_type_cached (domain, klass, "System.Diagnostics", "Process", &domain->process_class);
299 is_sdp_asyncreadhandler (MonoDomain *domain, MonoClass *klass)
302 return (klass->nested_in &&
303 is_sd_process (domain, klass->nested_in) &&
304 !strcmp (klass->name, "AsyncReadHandler"));
308 #ifdef DISABLE_SOCKETS
310 #define socket_io_cleanup(x)
313 get_event_from_state (MonoSocketAsyncResult *state)
315 g_assert_not_reached ();
320 get_events_from_list (MonoMList *list)
328 socket_io_cleanup (SocketIOData *data)
330 EnterCriticalSection (&data->io_lock);
331 if (data->inited != 2) {
332 LeaveCriticalSection (&data->io_lock);
336 data->shutdown (data->event_data);
337 LeaveCriticalSection (&data->io_lock);
341 get_event_from_state (MonoSocketAsyncResult *state)
343 switch (state->operation) {
346 case AIO_OP_RECV_JUST_CALLBACK:
347 case AIO_OP_RECEIVEFROM:
348 case AIO_OP_READPIPE:
349 case AIO_OP_ACCEPTRECEIVE:
350 case AIO_OP_RECEIVE_BUFFERS:
353 case AIO_OP_SEND_JUST_CALLBACK:
356 case AIO_OP_SEND_BUFFERS:
357 case AIO_OP_DISCONNECT:
359 default: /* Should never happen */
360 g_message ("get_event_from_state: unknown value in switch!!!");
366 get_events_from_list (MonoMList *list)
368 MonoSocketAsyncResult *state;
371 while (list && (state = (MonoSocketAsyncResult *)mono_mlist_get_data (list))) {
372 events |= get_event_from_state (state);
373 list = mono_mlist_next (list);
379 #define ICALL_RECV(x) ves_icall_System_Net_Sockets_Socket_Receive_internal (\
380 (SOCKET)(gssize)x->handle, x->buffer, x->offset, x->size,\
381 x->socket_flags, &x->error);
383 #define ICALL_SEND(x) ves_icall_System_Net_Sockets_Socket_Send_internal (\
384 (SOCKET)(gssize)x->handle, x->buffer, x->offset, x->size,\
385 x->socket_flags, &x->error);
387 #endif /* !DISABLE_SOCKETS */
390 threadpool_jobs_inc (MonoObject *obj)
393 InterlockedIncrement (&obj->vtable->domain->threadpool_jobs);
397 threadpool_jobs_dec (MonoObject *obj)
399 MonoDomain *domain = obj->vtable->domain;
400 int remaining_jobs = InterlockedDecrement (&domain->threadpool_jobs);
401 if (remaining_jobs == 0 && domain->cleanup_semaphore) {
402 ReleaseSemaphore (domain->cleanup_semaphore, 1, NULL);
409 get_io_event (MonoMList **list, gint event)
419 state = mono_mlist_get_data (current);
420 if (get_event_from_state ((MonoSocketAsyncResult *) state) == event)
425 current = mono_mlist_next (current);
430 mono_mlist_set_next (prev, mono_mlist_next (current));
432 *list = mono_mlist_next (*list);
440 * select/poll wake up when a socket is closed, but epoll just removes
441 * the socket from its internal list without notification.
444 mono_thread_pool_remove_socket (int sock)
447 MonoSocketAsyncResult *state;
450 if (socket_io_data.inited == 0)
453 EnterCriticalSection (&socket_io_data.io_lock);
454 if (socket_io_data.sock_to_state == NULL) {
455 LeaveCriticalSection (&socket_io_data.io_lock);
458 list = mono_g_hash_table_lookup (socket_io_data.sock_to_state, GINT_TO_POINTER (sock));
460 mono_g_hash_table_remove (socket_io_data.sock_to_state, GINT_TO_POINTER (sock));
461 LeaveCriticalSection (&socket_io_data.io_lock);
464 state = (MonoSocketAsyncResult *) mono_mlist_get_data (list);
465 if (state->operation == AIO_OP_RECEIVE)
466 state->operation = AIO_OP_RECV_JUST_CALLBACK;
467 else if (state->operation == AIO_OP_SEND)
468 state->operation = AIO_OP_SEND_JUST_CALLBACK;
470 ares = get_io_event (&list, MONO_POLLIN);
471 threadpool_append_job (&async_io_tp, ares);
473 ares = get_io_event (&list, MONO_POLLOUT);
474 threadpool_append_job (&async_io_tp, ares);
480 init_event_system (SocketIOData *data)
483 if (data->event_system == EPOLL_BACKEND)
484 data->event_data = tp_epoll_init (data);
485 #elif defined(HAVE_KQUEUE)
486 if (data->event_system == KQUEUE_BACKEND)
487 data->event_data = tp_kqueue_init (data);
489 if (data->event_system == POLL_BACKEND)
490 data->event_data = tp_poll_init (data);
494 socket_io_init (SocketIOData *data)
498 if (data->inited >= 2) // 2 -> initialized, 3-> cleaned up
501 inited = InterlockedCompareExchange (&data->inited, 1, 0);
504 if (data->inited >= 2)
510 EnterCriticalSection (&data->io_lock);
511 data->sock_to_state = mono_g_hash_table_new_type (g_direct_hash, g_direct_equal, MONO_HASH_VALUE_GC);
513 data->event_system = EPOLL_BACKEND;
514 #elif defined(HAVE_KQUEUE)
515 data->event_system = KQUEUE_BACKEND;
517 data->event_system = POLL_BACKEND;
519 if (g_getenv ("MONO_DISABLE_AIO") != NULL)
520 data->event_system = POLL_BACKEND;
522 init_event_system (data);
523 mono_thread_create_internal (mono_get_root_domain (), data->wait, data, TRUE, SMALL_STACK);
524 LeaveCriticalSection (&data->io_lock);
526 threadpool_start_thread (&async_io_tp);
530 socket_io_add (MonoAsyncResult *ares, MonoSocketAsyncResult *state)
533 SocketIOData *data = &socket_io_data;
538 socket_io_init (&socket_io_data);
539 if (mono_runtime_is_shutting_down () || data->inited == 3 || data->sock_to_state == NULL)
541 if (async_tp.pool_status == 2)
544 MONO_OBJECT_SETREF (state, ares, ares);
546 fd = GPOINTER_TO_INT (state->handle);
547 EnterCriticalSection (&data->io_lock);
548 if (data->sock_to_state == NULL) {
549 LeaveCriticalSection (&data->io_lock);
552 list = mono_g_hash_table_lookup (data->sock_to_state, GINT_TO_POINTER (fd));
554 list = mono_mlist_alloc ((MonoObject*)state);
557 list = mono_mlist_append (list, (MonoObject*)state);
561 mono_g_hash_table_replace (data->sock_to_state, state->handle, list);
562 ievt = get_events_from_list (list);
563 LeaveCriticalSection (&data->io_lock);
564 data->modify (data->event_data, fd, state->operation, ievt, is_new);
567 #ifndef DISABLE_SOCKETS
569 socket_io_filter (MonoObject *target, MonoObject *state)
572 MonoSocketAsyncResult *sock_res;
576 if (target == NULL || state == NULL)
579 domain = target->vtable->domain;
580 klass = target->vtable->klass;
581 if (socket_async_call_klass == NULL && is_socketasynccall (domain, klass))
582 socket_async_call_klass = klass;
584 if (process_async_call_klass == NULL && is_sdp_asyncreadhandler (domain, klass))
585 process_async_call_klass = klass;
587 if (klass != socket_async_call_klass && klass != process_async_call_klass)
590 sock_res = (MonoSocketAsyncResult *) state;
591 op = sock_res->operation;
592 if (op < AIO_OP_FIRST || op >= AIO_OP_LAST)
597 #endif /* !DISABLE_SOCKETS */
599 /* Returns the exception thrown when invoking, if any */
601 mono_async_invoke (ThreadPool *tp, MonoAsyncResult *ares)
603 ASyncCall *ac = (ASyncCall *)ares->object_data;
604 MonoObject *res, *exc = NULL;
605 MonoArray *out_args = NULL;
606 HANDLE wait_event = NULL;
608 if (ares->execution_context) {
609 /* use captured ExecutionContext (if available) */
610 MONO_OBJECT_SETREF (ares, original_context, mono_thread_get_execution_context ());
611 mono_thread_set_execution_context (ares->execution_context);
613 ares->original_context = NULL;
617 /* Fast path from ThreadPool.*QueueUserWorkItem */
618 void *pa = ares->async_state;
619 mono_runtime_delegate_invoke (ares->async_delegate, &pa, &exc);
621 MonoObject *cb_exc = NULL;
624 res = mono_message_invoke (ares->async_delegate, ac->msg, &exc, &out_args);
625 MONO_OBJECT_SETREF (ac, res, res);
626 MONO_OBJECT_SETREF (ac, msg->exc, exc);
627 MONO_OBJECT_SETREF (ac, out_args, out_args);
629 mono_monitor_enter ((MonoObject *) ares);
631 if (ares->handle != NULL)
632 wait_event = mono_wait_handle_get_handle ((MonoWaitHandle *) ares->handle);
633 mono_monitor_exit ((MonoObject *) ares);
634 /* notify listeners */
635 if (wait_event != NULL)
636 SetEvent (wait_event);
638 /* call async callback if cb_method != null*/
639 if (ac != NULL && ac->cb_method) {
642 mono_runtime_invoke (ac->cb_method, ac->cb_target, pa, &cb_exc);
643 MONO_OBJECT_SETREF (ac->msg, exc, cb_exc);
650 /* restore original thread execution context if flow isn't suppressed, i.e. non null */
651 if (ares->original_context) {
652 mono_thread_set_execution_context (ares->original_context);
653 ares->original_context = NULL;
659 threadpool_start_idle_threads (ThreadPool *tp)
664 stack_size = (!tp->is_io) ? 0 : SMALL_STACK;
668 if (n >= tp->min_threads)
670 if (InterlockedCompareExchange (&tp->nthreads, n + 1, n) == n)
673 mono_perfcounter_update_value (tp->pc_nthreads, TRUE, 1);
674 mono_thread_create_internal (mono_get_root_domain (), tp->async_invoke, tp, TRUE, stack_size);
680 threadpool_init (ThreadPool *tp, int min_threads, int max_threads, void (*async_invoke) (gpointer))
682 memset (tp, 0, sizeof (ThreadPool));
683 tp->min_threads = min_threads;
684 tp->max_threads = max_threads;
685 tp->async_invoke = async_invoke;
686 tp->queue = mono_cq_create ();
687 MONO_SEM_INIT (&tp->new_job, 0);
691 init_perf_counter (const char *category, const char *counter)
693 MonoString *category_str;
694 MonoString *counter_str;
700 if (category == NULL || counter == NULL)
702 root = mono_get_root_domain ();
703 category_str = mono_string_new (root, category);
704 counter_str = mono_string_new (root, counter);
705 machine = mono_string_new (root, ".");
706 return mono_perfcounter_get_impl (category_str, counter_str, NULL, machine, &type, &custom);
711 print_pool_info (ThreadPool *tp)
714 // if (tp->tail - tp->head == 0)
717 g_print ("Pool status? %d\n", InterlockedCompareExchange (&tp->pool_status, 0, 0));
718 g_print ("Min. threads: %d\n", InterlockedCompareExchange (&tp->min_threads, 0, 0));
719 g_print ("Max. threads: %d\n", InterlockedCompareExchange (&tp->max_threads, 0, 0));
720 g_print ("nthreads: %d\n", InterlockedCompareExchange (&tp->nthreads, 0, 0));
721 g_print ("busy threads: %d\n", InterlockedCompareExchange (&tp->busy_threads, 0, 0));
722 g_print ("Waiting: %d\n", InterlockedCompareExchange (&tp->waiting, 0, 0));
723 g_print ("Queued: %d\n", (tp->tail - tp->head));
724 if (tp == &async_tp) {
726 EnterCriticalSection (&wsqs_lock);
727 for (i = 0; i < wsqs->len; i++) {
728 g_print ("\tWSQ %d: %d\n", i, mono_wsq_count (g_ptr_array_index (wsqs, i)));
730 LeaveCriticalSection (&wsqs_lock);
732 g_print ("\tSockets: %d\n", mono_g_hash_table_size (socket_io_data.sock_to_state));
734 g_print ("-------------\n");
738 signal_handler (int signo)
743 g_print ("\n-----Non-IO-----\n");
744 print_pool_info (tp);
746 g_print ("\n-----IO-----\n");
747 print_pool_info (tp);
753 monitor_thread (gpointer unused)
755 ThreadPool *pools [2];
756 MonoInternalThread *thread;
761 pools [0] = &async_tp;
762 pools [1] = &async_io_tp;
763 thread = mono_thread_internal_current ();
764 ves_icall_System_Threading_Thread_SetName_internal (thread, mono_string_new (mono_domain_get (), "Threadpool 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 ())
782 for (i = 0; i < 2; i++) {
787 need_one = (mono_cq_count (tp->queue) > 0);
788 if (!need_one && !tp->is_io) {
789 EnterCriticalSection (&wsqs_lock);
790 for (i = 0; wsqs != NULL && i < wsqs->len; i++) {
792 wsq = g_ptr_array_index (wsqs, i);
793 if (mono_wsq_count (wsq) != 0) {
798 LeaveCriticalSection (&wsqs_lock);
801 threadpool_start_thread (tp);
807 mono_thread_pool_init ()
809 gint threads_per_cpu = 1;
811 gint cpu_count = mono_cpu_count ();
817 result = InterlockedCompareExchange (&tp_inited, 1, 0);
826 MONO_GC_REGISTER_ROOT_FIXED (socket_io_data.sock_to_state);
827 InitializeCriticalSection (&socket_io_data.io_lock);
828 if (g_getenv ("MONO_THREADS_PER_CPU") != NULL) {
829 threads_per_cpu = atoi (g_getenv ("MONO_THREADS_PER_CPU"));
830 if (threads_per_cpu < 1)
834 thread_count = MIN (cpu_count * threads_per_cpu, 100 * cpu_count);
835 threadpool_init (&async_tp, thread_count, MAX (100 * cpu_count, thread_count), async_invoke_thread);
836 threadpool_init (&async_io_tp, cpu_count * 2, cpu_count * 4, async_invoke_thread);
837 async_io_tp.is_io = TRUE;
839 async_call_klass = mono_class_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
840 g_assert (async_call_klass);
842 InitializeCriticalSection (&wsqs_lock);
843 wsqs = g_ptr_array_sized_new (MAX (100 * cpu_count, thread_count));
846 async_tp.pc_nitems = init_perf_counter ("Mono Threadpool", "Work Items Added");
847 g_assert (async_tp.pc_nitems);
849 async_io_tp.pc_nitems = init_perf_counter ("Mono Threadpool", "IO Work Items Added");
850 g_assert (async_io_tp.pc_nitems);
852 async_tp.pc_nthreads = init_perf_counter ("Mono Threadpool", "# of Threads");
853 g_assert (async_tp.pc_nthreads);
855 async_io_tp.pc_nthreads = init_perf_counter ("Mono Threadpool", "# of IO Threads");
856 g_assert (async_io_tp.pc_nthreads);
859 signal (SIGALRM, signal_handler);
864 static MonoAsyncResult *
865 create_simple_asyncresult (MonoObject *target, MonoObject *state)
867 MonoDomain *domain = mono_domain_get ();
868 MonoAsyncResult *ares;
870 /* Don't call mono_async_result_new() to avoid capturing the context */
871 ares = (MonoAsyncResult *) mono_object_new (domain, mono_defaults.asyncresult_class);
872 MONO_OBJECT_SETREF (ares, async_delegate, target);
873 MONO_OBJECT_SETREF (ares, async_state, state);
878 icall_append_io_job (MonoObject *target, MonoSocketAsyncResult *state)
880 MonoAsyncResult *ares;
882 ares = create_simple_asyncresult (target, (MonoObject *) state);
883 socket_io_add (ares, state);
887 mono_thread_pool_add (MonoObject *target, MonoMethodMessage *msg, MonoDelegate *async_callback,
890 MonoDomain *domain = mono_domain_get ();
891 MonoAsyncResult *ares;
894 ac = (ASyncCall*)mono_object_new (domain, async_call_klass);
895 MONO_OBJECT_SETREF (ac, msg, msg);
896 MONO_OBJECT_SETREF (ac, state, state);
898 if (async_callback) {
899 ac->cb_method = mono_get_delegate_invoke (((MonoObject *)async_callback)->vtable->klass);
900 MONO_OBJECT_SETREF (ac, cb_target, async_callback);
903 ares = mono_async_result_new (domain, NULL, ac->state, NULL, (MonoObject*)ac);
904 MONO_OBJECT_SETREF (ares, async_delegate, target);
906 #ifndef DISABLE_SOCKETS
907 if (socket_io_filter (target, state)) {
908 socket_io_add (ares, (MonoSocketAsyncResult *) state);
912 threadpool_append_job (&async_tp, (MonoObject *) ares);
917 mono_thread_pool_finish (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc)
925 /* check if already finished */
926 mono_monitor_enter ((MonoObject *) ares);
928 if (ares->endinvoke_called) {
929 *exc = (MonoObject *) mono_get_exception_invalid_operation (NULL);
930 mono_monitor_exit ((MonoObject *) ares);
934 ares->endinvoke_called = 1;
935 /* wait until we are really finished */
936 if (!ares->completed) {
937 if (ares->handle == NULL) {
938 wait_event = CreateEvent (NULL, TRUE, FALSE, NULL);
939 g_assert(wait_event != 0);
940 MONO_OBJECT_SETREF (ares, handle, (MonoObject *) mono_wait_handle_new (mono_object_domain (ares), wait_event));
942 wait_event = mono_wait_handle_get_handle ((MonoWaitHandle *) ares->handle);
944 mono_monitor_exit ((MonoObject *) ares);
945 WaitForSingleObjectEx (wait_event, INFINITE, TRUE);
947 mono_monitor_exit ((MonoObject *) ares);
950 ac = (ASyncCall *) ares->object_data;
951 g_assert (ac != NULL);
952 *exc = ac->msg->exc; /* FIXME: GC add write barrier */
953 *out_args = ac->out_args;
959 threadpool_kill_idle_threads (ThreadPool *tp)
963 n = (gint) InterlockedCompareExchange (&tp->max_threads, 0, -1);
966 MONO_SEM_POST (&tp->new_job);
971 mono_thread_pool_cleanup (void)
973 if (InterlockedExchange (&async_io_tp.pool_status, 2) == 1) {
974 socket_io_cleanup (&socket_io_data); /* Empty when DISABLE_SOCKETS is defined */
975 threadpool_kill_idle_threads (&async_io_tp);
978 if (async_io_tp.queue != NULL) {
979 MONO_SEM_DESTROY (&async_io_tp.new_job);
980 threadpool_free_queue (&async_io_tp);
984 if (InterlockedExchange (&async_tp.pool_status, 2) == 1) {
985 threadpool_kill_idle_threads (&async_tp);
986 threadpool_free_queue (&async_tp);
990 EnterCriticalSection (&wsqs_lock);
993 g_ptr_array_free (wsqs, TRUE);
995 LeaveCriticalSection (&wsqs_lock);
996 MONO_SEM_DESTROY (&async_tp.new_job);
1001 threadpool_start_thread (ThreadPool *tp)
1006 stack_size = (!tp->is_io) ? 0 : SMALL_STACK;
1007 while (!mono_runtime_is_shutting_down () && (n = tp->nthreads) < tp->max_threads) {
1008 if (InterlockedCompareExchange (&tp->nthreads, n + 1, n) == n) {
1009 mono_perfcounter_update_value (tp->pc_nthreads, TRUE, 1);
1010 mono_thread_create_internal (mono_get_root_domain (), tp->async_invoke, tp, TRUE, stack_size);
1019 pulse_on_new_job (ThreadPool *tp)
1022 MONO_SEM_POST (&tp->new_job);
1026 icall_append_job (MonoObject *ar)
1028 threadpool_append_jobs (&async_tp, &ar, 1);
1032 threadpool_append_job (ThreadPool *tp, MonoObject *ar)
1034 threadpool_append_jobs (tp, &ar, 1);
1038 threadpool_append_jobs (ThreadPool *tp, MonoObject **jobs, gint njobs)
1040 static int job_counter;
1044 if (mono_runtime_is_shutting_down ())
1047 if (tp->pool_status == 0 && InterlockedCompareExchange (&tp->pool_status, 1, 0) == 0) {
1049 mono_thread_create_internal (mono_get_root_domain (), monitor_thread, NULL, TRUE, SMALL_STACK);
1050 /* Create on demand up to min_threads to avoid startup penalty for apps that don't use
1051 * the threadpool that much
1052 * mono_thread_create_internal (mono_get_root_domain (), threadpool_start_idle_threads, tp, TRUE, SMALL_STACK);
1056 for (i = 0; i < njobs; i++) {
1058 if (ar == NULL || mono_domain_is_unloading (ar->vtable->domain))
1059 continue; /* Might happen when cleaning domain jobs */
1060 if (!tp->is_io && (InterlockedIncrement (&job_counter) % 10) == 0) {
1061 MonoAsyncResult *o = (MonoAsyncResult *) ar;
1062 o->add_time = mono_100ns_ticks ();
1064 threadpool_jobs_inc (ar);
1065 mono_perfcounter_update_value (tp->pc_nitems, TRUE, 1);
1066 if (!tp->is_io && mono_wsq_local_push (ar))
1069 mono_cq_enqueue (tp->queue, ar);
1072 for (i = 0; tp->waiting > 0 && i < MIN(njobs, tp->max_threads); i++)
1073 pulse_on_new_job (tp);
1077 threadpool_clear_queue (ThreadPool *tp, MonoDomain *domain)
1083 while (mono_cq_dequeue (tp->queue, &obj)) {
1086 if (obj->vtable->domain != domain)
1087 other = mono_mlist_prepend (other, obj);
1088 threadpool_jobs_dec (obj);
1092 threadpool_append_job (tp, (MonoObject *) mono_mlist_get_data (other));
1093 other = mono_mlist_next (other);
1098 * Clean up the threadpool of all domain jobs.
1099 * Can only be called as part of the domain unloading process as
1100 * it will wait for all jobs to be visible to the interruption code.
1103 mono_thread_pool_remove_domain_jobs (MonoDomain *domain, int timeout)
1107 guint32 start_time = 0;
1109 g_assert (domain->state == MONO_APPDOMAIN_UNLOADING);
1111 threadpool_clear_queue (&async_tp, domain);
1112 threadpool_clear_queue (&async_io_tp, domain);
1115 * There might be some threads out that could be about to execute stuff from the given domain.
1116 * We avoid that by setting up a semaphore to be pulsed by the thread that reaches zero.
1118 sem_handle = CreateSemaphore (NULL, 0, 1, NULL);
1120 domain->cleanup_semaphore = sem_handle;
1122 * The memory barrier here is required to have global ordering between assigning to cleanup_semaphone
1123 * and reading threadpool_jobs.
1124 * Otherwise this thread could read a stale version of threadpool_jobs and wait forever.
1126 mono_memory_write_barrier ();
1128 if (domain->threadpool_jobs && timeout != -1)
1129 start_time = mono_msec_ticks ();
1130 while (domain->threadpool_jobs) {
1131 WaitForSingleObject (sem_handle, timeout);
1132 if (timeout != -1 && (mono_msec_ticks () - start_time) > timeout) {
1138 domain->cleanup_semaphore = NULL;
1139 CloseHandle (sem_handle);
1144 threadpool_free_queue (ThreadPool *tp)
1146 mono_cq_destroy (tp->queue);
1151 mono_thread_pool_is_queue_array (MonoArray *o)
1153 // gpointer obj = o;
1155 // FIXME: need some fix in sgen code.
1165 EnterCriticalSection (&wsqs_lock);
1166 wsq = mono_wsq_create ();
1168 LeaveCriticalSection (&wsqs_lock);
1171 for (i = 0; i < wsqs->len; i++) {
1172 if (g_ptr_array_index (wsqs, i) == NULL) {
1173 wsqs->pdata [i] = wsq;
1174 LeaveCriticalSection (&wsqs_lock);
1178 g_ptr_array_add (wsqs, wsq);
1179 LeaveCriticalSection (&wsqs_lock);
1184 remove_wsq (MonoWSQ *wsq)
1191 EnterCriticalSection (&wsqs_lock);
1193 LeaveCriticalSection (&wsqs_lock);
1196 g_ptr_array_remove_fast (wsqs, wsq);
1199 * Only clean this up when shutting down, any other case will error out
1200 * if we're removing a queue that still has work items.
1202 if (mono_runtime_is_shutting_down ()) {
1203 while (mono_wsq_local_pop (&data)) {
1204 threadpool_jobs_dec (data);
1208 mono_wsq_destroy (wsq);
1209 LeaveCriticalSection (&wsqs_lock);
1213 try_steal (MonoWSQ *local_wsq, gpointer *data, gboolean retry)
1218 if (wsqs == NULL || data == NULL || *data != NULL)
1223 if (mono_runtime_is_shutting_down ())
1226 EnterCriticalSection (&wsqs_lock);
1227 for (i = 0; wsqs != NULL && i < wsqs->len; i++) {
1230 wsq = wsqs->pdata [i];
1231 if (wsq == local_wsq || mono_wsq_count (wsq) == 0)
1233 mono_wsq_try_steal (wsqs->pdata [i], data, ms);
1234 if (*data != NULL) {
1235 LeaveCriticalSection (&wsqs_lock);
1239 LeaveCriticalSection (&wsqs_lock);
1241 } while (retry && ms < 11);
1245 dequeue_or_steal (ThreadPool *tp, gpointer *data, MonoWSQ *local_wsq)
1247 if (mono_runtime_is_shutting_down ())
1249 mono_cq_dequeue (tp->queue, (MonoObject **) data);
1250 if (!tp->is_io && !*data)
1251 try_steal (local_wsq, data, FALSE);
1252 return (*data != NULL);
1256 process_idle_times (ThreadPool *tp, gint64 t)
1260 gboolean compute_avg;
1264 if (tp->ignore_times || t <= 0)
1267 compute_avg = FALSE;
1268 ticks = mono_100ns_ticks ();
1270 SPIN_LOCK (tp->sp_lock);
1271 if (tp->ignore_times) {
1272 SPIN_UNLOCK (tp->sp_lock);
1277 if (tp->last_check == 0)
1278 tp->last_check = ticks;
1279 else if (tp->last_check > 0 && (ticks - tp->last_check) > 5000000) {
1280 tp->ignore_times = 1;
1283 SPIN_UNLOCK (tp->sp_lock);
1288 //printf ("Items: %d Time elapsed: %.3fs\n", tp->n_sum, (ticks - tp->last_check) / 10000.0);
1289 tp->last_check = ticks;
1291 avg = tp->time_sum / tp->n_sum;
1292 if (tp->averages [1] == 0) {
1293 tp->averages [1] = avg;
1295 per1 = ((100 * (ABS (avg - tp->averages [1]))) / tp->averages [1]);
1297 if (avg > tp->averages [1]) {
1298 if (tp->averages [1] < tp->averages [0]) {
1303 } else if (avg < tp->averages [1] && tp->averages [1] < tp->averages [0]) {
1308 min = tp->min_threads;
1310 if ((n - min) < min && tp->busy_threads == n)
1314 if (new_threads != 0) {
1315 printf ("n: %d per1: %lld avg=%lld avg1=%lld avg0=%lld\n", new_threads, per1, avg, tp->averages [1], tp->averages [0]);
1323 tp->averages [0] = tp->averages [1];
1324 tp->averages [1] = avg;
1325 tp->ignore_times = 0;
1327 if (new_threads == -1) {
1328 if (tp->destroy_thread == 0 && InterlockedCompareExchange (&tp->destroy_thread, 1, 0) == 0)
1329 pulse_on_new_job (tp);
1334 should_i_die (ThreadPool *tp)
1336 gboolean result = FALSE;
1337 if (tp->destroy_thread == 1 && InterlockedCompareExchange (&tp->destroy_thread, 0, 1) == 1)
1338 result = (tp->nthreads > tp->min_threads);
1343 async_invoke_thread (gpointer data)
1346 MonoInternalThread *thread;
1357 thread = mono_thread_internal_current ();
1359 mono_profiler_thread_start (thread->tid);
1360 name = (tp->is_io) ? "IO Threadpool worker" : "Threadpool worker";
1361 ves_icall_System_Threading_Thread_SetName_internal (thread, mono_string_new (mono_domain_get (), name));
1364 tp_start_func (tp_hooks_user_data);
1368 MonoAsyncResult *ar;
1370 gboolean is_io_task;
1375 ar = (MonoAsyncResult *) data;
1377 InterlockedIncrement (&tp->busy_threads);
1378 domain = ((MonoObject *)ar)->vtable->domain;
1379 #ifndef DISABLE_SOCKETS
1380 klass = ((MonoObject *) data)->vtable->klass;
1381 is_io_task = !is_corlib_asyncresult (domain, klass);
1384 MonoSocketAsyncResult *state = (MonoSocketAsyncResult *) data;
1385 is_socket = is_socketasyncresult (domain, klass);
1387 switch (state->operation) {
1388 case AIO_OP_RECEIVE:
1389 state->total = ICALL_RECV (state);
1392 state->total = ICALL_SEND (state);
1397 /* worker threads invokes methods in different domains,
1398 * so we need to set the right domain here */
1401 if (mono_domain_is_unloading (domain) || mono_runtime_is_shutting_down ()) {
1402 threadpool_jobs_dec ((MonoObject *)ar);
1405 InterlockedDecrement (&tp->busy_threads);
1407 mono_thread_push_appdomain_ref (domain);
1408 if (threadpool_jobs_dec ((MonoObject *)ar)) {
1411 mono_thread_pop_appdomain_ref ();
1412 InterlockedDecrement (&tp->busy_threads);
1416 if (mono_domain_set (domain, FALSE)) {
1419 if (tp_item_begin_func)
1420 tp_item_begin_func (tp_item_user_data);
1422 if (!is_io_task && ar->add_time > 0)
1423 process_idle_times (tp, ar->add_time);
1424 exc = mono_async_invoke (tp, ar);
1425 if (tp_item_end_func)
1426 tp_item_end_func (tp_item_user_data);
1427 if (exc && mono_runtime_unhandled_exception_policy_get () == MONO_UNHANDLED_POLICY_CURRENT) {
1431 klass = exc->vtable->klass;
1432 unloaded = is_appdomainunloaded_exception (exc->vtable->domain, klass);
1433 if (!unloaded && klass != mono_defaults.threadabortexception_class) {
1434 mono_unhandled_exception (exc);
1437 if (klass == mono_defaults.threadabortexception_class)
1438 mono_thread_internal_reset_abort (thread);
1440 if (is_socket && tp->is_io) {
1441 MonoSocketAsyncResult *state = (MonoSocketAsyncResult *) data;
1443 if (state->completed && state->callback) {
1444 MonoAsyncResult *cb_ares;
1445 cb_ares = create_simple_asyncresult ((MonoObject *) state->callback,
1446 (MonoObject *) state);
1447 icall_append_job ((MonoObject *) cb_ares);
1450 mono_domain_set (mono_get_root_domain (), TRUE);
1452 mono_thread_pop_appdomain_ref ();
1453 InterlockedDecrement (&tp->busy_threads);
1454 /* If the callee changes the background status, set it back to TRUE */
1455 mono_thread_clr_state (thread , ~ThreadState_Background);
1456 if (!mono_thread_test_state (thread , ThreadState_Background))
1457 ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background);
1463 must_die = should_i_die (tp);
1464 if (!must_die && (tp->is_io || !mono_wsq_local_pop (&data)))
1465 dequeue_or_steal (tp, &data, wsq);
1468 while (!must_die && !data && n_naps < 4) {
1471 InterlockedIncrement (&tp->waiting);
1472 #if defined(__OpenBSD__)
1473 while ((res = mono_sem_wait (&tp->new_job, TRUE)) == -1) {// && errno == EINTR) {
1475 while ((res = mono_sem_timedwait (&tp->new_job, 2000, TRUE)) == -1) {// && errno == EINTR) {
1477 if (mono_runtime_is_shutting_down ())
1479 if (THREAD_WANTS_A_BREAK (thread))
1480 mono_thread_interruption_checkpoint ();
1482 InterlockedDecrement (&tp->waiting);
1483 if (mono_runtime_is_shutting_down ())
1485 must_die = should_i_die (tp);
1486 dequeue_or_steal (tp, &data, wsq);
1490 if (!data && !tp->is_io && !mono_runtime_is_shutting_down ()) {
1491 mono_wsq_local_pop (&data);
1492 if (data && must_die) {
1493 InterlockedCompareExchange (&tp->destroy_thread, 1, 0);
1494 pulse_on_new_job (tp);
1503 down = mono_runtime_is_shutting_down ();
1504 if (!down && nt <= tp->min_threads)
1506 if (down || InterlockedCompareExchange (&tp->nthreads, nt - 1, nt) == nt) {
1507 mono_perfcounter_update_value (tp->pc_nthreads, TRUE, -1);
1512 mono_profiler_thread_end (thread->tid);
1515 tp_finish_func (tp_hooks_user_data);
1522 g_assert_not_reached ();
1526 ves_icall_System_Threading_ThreadPool_GetAvailableThreads (gint *workerThreads, gint *completionPortThreads)
1528 *workerThreads = async_tp.max_threads - async_tp.busy_threads;
1529 *completionPortThreads = async_io_tp.max_threads - async_io_tp.busy_threads;
1533 ves_icall_System_Threading_ThreadPool_GetMaxThreads (gint *workerThreads, gint *completionPortThreads)
1535 *workerThreads = async_tp.max_threads;
1536 *completionPortThreads = async_io_tp.max_threads;
1540 ves_icall_System_Threading_ThreadPool_GetMinThreads (gint *workerThreads, gint *completionPortThreads)
1542 *workerThreads = async_tp.min_threads;
1543 *completionPortThreads = async_io_tp.min_threads;
1547 ves_icall_System_Threading_ThreadPool_SetMinThreads (gint workerThreads, gint completionPortThreads)
1550 gint max_io_threads;
1552 max_threads = async_tp.max_threads;
1553 if (workerThreads <= 0 || workerThreads > max_threads)
1556 max_io_threads = async_io_tp.max_threads;
1557 if (completionPortThreads <= 0 || completionPortThreads > max_io_threads)
1560 InterlockedExchange (&async_tp.min_threads, workerThreads);
1561 InterlockedExchange (&async_io_tp.min_threads, completionPortThreads);
1562 if (workerThreads > async_tp.nthreads)
1563 mono_thread_create_internal (mono_get_root_domain (), threadpool_start_idle_threads, &async_tp, TRUE, SMALL_STACK);
1564 if (completionPortThreads > async_io_tp.nthreads)
1565 mono_thread_create_internal (mono_get_root_domain (), threadpool_start_idle_threads, &async_io_tp, TRUE, SMALL_STACK);
1570 ves_icall_System_Threading_ThreadPool_SetMaxThreads (gint workerThreads, gint completionPortThreads)
1573 gint min_io_threads;
1576 cpu_count = mono_cpu_count ();
1577 min_threads = async_tp.min_threads;
1578 if (workerThreads < min_threads || workerThreads < cpu_count)
1581 /* We don't really have the concept of completion ports. Do we care here? */
1582 min_io_threads = async_io_tp.min_threads;
1583 if (completionPortThreads < min_io_threads || completionPortThreads < cpu_count)
1586 InterlockedExchange (&async_tp.max_threads, workerThreads);
1587 InterlockedExchange (&async_io_tp.max_threads, completionPortThreads);
1592 * mono_install_threadpool_thread_hooks
1593 * @start_func: the function to be called right after a new threadpool thread is created. Can be NULL.
1594 * @finish_func: the function to be called right before a thredpool thread is exiting. Can be NULL.
1595 * @user_data: argument passed to @start_func and @finish_func.
1597 * @start_fun will be called right after a threadpool thread is created and @finish_func right before a threadpool thread exits.
1598 * The calls will be made from the thread itself.
1601 mono_install_threadpool_thread_hooks (MonoThreadPoolFunc start_func, MonoThreadPoolFunc finish_func, gpointer user_data)
1603 tp_start_func = start_func;
1604 tp_finish_func = finish_func;
1605 tp_hooks_user_data = user_data;
1609 * mono_install_threadpool_item_hooks
1610 * @begin_func: the function to be called before a threadpool work item processing starts.
1611 * @end_func: the function to be called after a threadpool work item is finished.
1612 * @user_data: argument passed to @begin_func and @end_func.
1614 * The calls will be made from the thread itself and from the same AppDomain
1615 * where the work item was executed.
1619 mono_install_threadpool_item_hooks (MonoThreadPoolItemFunc begin_func, MonoThreadPoolItemFunc end_func, gpointer user_data)
1621 tp_item_begin_func = begin_func;
1622 tp_item_end_func = end_func;
1623 tp_item_user_data = user_data;