/* * threadpool.c: global thread pool * * Authors: * Dietmar Maurer (dietmar@ximian.com) * Gonzalo Paniagua Javier (gonzalo@ximian.com) * * Copyright 2001-2003 Ximian, Inc (http://www.ximian.com) * Copyright 2004-2010 Novell, Inc (http://www.novell.com) * Copyright 2001 Xamarin Inc (http://www.xamarin.com) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef HAVE_SYS_TIME_H #include #endif #include #include #ifdef HAVE_UNISTD_H #include #endif #include #ifdef HAVE_SYS_SOCKET_H #include #endif #include #ifdef HAVE_EPOLL #include #endif #ifdef HAVE_KQUEUE #include #endif #ifndef DISABLE_SOCKETS #include "mono/io-layer/socket-wrappers.h" #endif #include "threadpool.h" #define THREAD_WANTS_A_BREAK(t) ((t->state & (ThreadState_StopRequested | \ ThreadState_SuspendRequested)) != 0) #define SPIN_TRYLOCK(i) (InterlockedCompareExchange (&(i), 1, 0) == 0) #define SPIN_LOCK(i) do { \ if (SPIN_TRYLOCK (i)) \ break; \ } while (1) #define SPIN_UNLOCK(i) i = 0 #define SMALL_STACK (128 * (sizeof (gpointer) / 4) * 1024) /* DEBUG: prints tp data every 2s */ #undef DEBUG /* mono_thread_pool_init called */ static volatile int tp_inited; enum { POLL_BACKEND, EPOLL_BACKEND, KQUEUE_BACKEND }; typedef struct { CRITICAL_SECTION io_lock; /* access to sock_to_state */ int inited; // 0 -> not initialized , 1->initializing, 2->initialized, 3->cleaned up MonoGHashTable *sock_to_state; gint event_system; gpointer event_data; void (*modify) (gpointer p, int fd, int operation, int events, gboolean is_new); void (*wait) (gpointer sock_data); void (*shutdown) (gpointer event_data); } SocketIOData; static SocketIOData socket_io_data; /* Keep in sync with the System.MonoAsyncCall class which provides GC tracking */ typedef struct { MonoObject object; MonoMethodMessage *msg; MonoMethod *cb_method; MonoDelegate *cb_target; MonoObject *state; MonoObject *res; MonoArray *out_args; } ASyncCall; typedef struct { MonoSemType lock; MonoCQ *queue; /* GC root */ MonoSemType new_job; volatile gint waiting; /* threads waiting for a work item */ /**/ volatile gint pool_status; /* 0 -> not initialized, 1 -> initialized, 2 -> cleaning up */ /* min, max, n and busy -> Interlocked */ volatile gint min_threads; volatile gint max_threads; volatile gint nthreads; volatile gint busy_threads; void (*async_invoke) (gpointer data); void *pc_nitems; /* Performance counter for total number of items in added */ void *pc_nthreads; /* Performance counter for total number of active threads */ /**/ volatile gint destroy_thread; volatile gint ignore_times; /* Used when there's a thread being created or destroyed */ volatile gint sp_lock; /* spin lock used to protect ignore_times */ volatile gint64 last_check; volatile gint64 time_sum; volatile gint n_sum; gint64 averages [2]; gboolean is_io; } ThreadPool; static ThreadPool async_tp; static ThreadPool async_io_tp; static void async_invoke_thread (gpointer data); static MonoObject *mono_async_invoke (ThreadPool *tp, MonoAsyncResult *ares); static void threadpool_free_queue (ThreadPool *tp); static void threadpool_append_job (ThreadPool *tp, MonoObject *ar); static void threadpool_append_jobs (ThreadPool *tp, MonoObject **jobs, gint njobs); static void threadpool_init (ThreadPool *tp, int min_threads, int max_threads, void (*async_invoke) (gpointer)); static void threadpool_start_idle_threads (ThreadPool *tp); static void threadpool_kill_idle_threads (ThreadPool *tp); static gboolean threadpool_start_thread (ThreadPool *tp); static void monitor_thread (gpointer data); static void socket_io_cleanup (SocketIOData *data); static MonoObject *get_io_event (MonoMList **list, gint event); static int get_events_from_list (MonoMList *list); static int get_event_from_state (MonoSocketAsyncResult *state); static void check_for_interruption_critical (void); static MonoClass *async_call_klass; static MonoClass *socket_async_call_klass; static MonoClass *process_async_call_klass; static GPtrArray *wsqs; CRITICAL_SECTION wsqs_lock; static gboolean suspended; /* Hooks */ static MonoThreadPoolFunc tp_start_func; static MonoThreadPoolFunc tp_finish_func; static gpointer tp_hooks_user_data; static MonoThreadPoolItemFunc tp_item_begin_func; static MonoThreadPoolItemFunc tp_item_end_func; static gpointer tp_item_user_data; enum { AIO_OP_FIRST, AIO_OP_ACCEPT = 0, AIO_OP_CONNECT, AIO_OP_RECEIVE, AIO_OP_RECEIVEFROM, AIO_OP_SEND, AIO_OP_SENDTO, AIO_OP_RECV_JUST_CALLBACK, AIO_OP_SEND_JUST_CALLBACK, AIO_OP_READPIPE, AIO_OP_CONSOLE2, AIO_OP_DISCONNECT, AIO_OP_ACCEPTRECEIVE, AIO_OP_RECEIVE_BUFFERS, AIO_OP_SEND_BUFFERS, AIO_OP_LAST }; #include #ifdef HAVE_EPOLL #include #elif defined(USE_KQUEUE_FOR_THREADPOOL) #include #endif /* * Functions to check whenever a class is given system class. We need to cache things in MonoDomain since some of the * assemblies can be unloaded. */ static gboolean is_system_type (MonoDomain *domain, MonoClass *klass) { if (domain->system_image == NULL) domain->system_image = mono_image_loaded ("System"); return klass->image == domain->system_image; } static gboolean is_corlib_type (MonoDomain *domain, MonoClass *klass) { return klass->image == mono_defaults.corlib; } /* * Note that we call it is_socket_type() where 'socket' refers to the image * that contains the System.Net.Sockets.Socket type. */ static gboolean is_socket_type (MonoDomain *domain, MonoClass *klass) { return is_system_type (domain, klass); } #define check_type_cached(domain, ASSEMBLY, _class, _namespace, _name, loc) do { \ if (*loc) \ return *loc == _class; \ if (is_##ASSEMBLY##_type (domain, _class) && !strcmp (_name, _class->name) && !strcmp (_namespace, _class->name_space)) { \ *loc = _class; \ return TRUE; \ } \ return FALSE; \ } while (0) \ #define check_corlib_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, corlib, _class, _namespace, _name, loc) #define check_socket_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, socket, _class, _namespace, _name, loc) #define check_system_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, system, _class, _namespace, _name, loc) static gboolean is_corlib_asyncresult (MonoDomain *domain, MonoClass *klass) { check_corlib_type_cached (domain, klass, "System.Runtime.Remoting.Messaging", "AsyncResult", &domain->corlib_asyncresult_class); } static gboolean is_socket (MonoDomain *domain, MonoClass *klass) { check_socket_type_cached (domain, klass, "System.Net.Sockets", "Socket", &domain->socket_class); } static gboolean is_socketasyncresult (MonoDomain *domain, MonoClass *klass) { return (klass->nested_in && is_socket (domain, klass->nested_in) && !strcmp (klass->name, "SocketAsyncResult")); } static gboolean is_socketasynccall (MonoDomain *domain, MonoClass *klass) { return (klass->nested_in && is_socket (domain, klass->nested_in) && !strcmp (klass->name, "SocketAsyncCall")); } static gboolean is_appdomainunloaded_exception (MonoDomain *domain, MonoClass *klass) { check_corlib_type_cached (domain, klass, "System", "AppDomainUnloadedException", &domain->ad_unloaded_ex_class); } static gboolean is_sd_process (MonoDomain *domain, MonoClass *klass) { check_system_type_cached (domain, klass, "System.Diagnostics", "Process", &domain->process_class); } static gboolean is_sdp_asyncreadhandler (MonoDomain *domain, MonoClass *klass) { return (klass->nested_in && is_sd_process (domain, klass->nested_in) && !strcmp (klass->name, "AsyncReadHandler")); } #ifdef DISABLE_SOCKETS #define socket_io_cleanup(x) static int get_event_from_state (MonoSocketAsyncResult *state) { g_assert_not_reached (); return -1; } static int get_events_from_list (MonoMList *list) { return 0; } #else static void socket_io_cleanup (SocketIOData *data) { EnterCriticalSection (&data->io_lock); if (data->inited != 2) { LeaveCriticalSection (&data->io_lock); return; } data->inited = 3; data->shutdown (data->event_data); LeaveCriticalSection (&data->io_lock); } static int get_event_from_state (MonoSocketAsyncResult *state) { switch (state->operation) { case AIO_OP_ACCEPT: case AIO_OP_RECEIVE: case AIO_OP_RECV_JUST_CALLBACK: case AIO_OP_RECEIVEFROM: case AIO_OP_READPIPE: case AIO_OP_ACCEPTRECEIVE: case AIO_OP_RECEIVE_BUFFERS: return MONO_POLLIN; case AIO_OP_SEND: case AIO_OP_SEND_JUST_CALLBACK: case AIO_OP_SENDTO: case AIO_OP_CONNECT: case AIO_OP_SEND_BUFFERS: case AIO_OP_DISCONNECT: return MONO_POLLOUT; default: /* Should never happen */ g_message ("get_event_from_state: unknown value in switch!!!"); return 0; } } static int get_events_from_list (MonoMList *list) { MonoSocketAsyncResult *state; int events = 0; while (list && (state = (MonoSocketAsyncResult *)mono_mlist_get_data (list))) { events |= get_event_from_state (state); list = mono_mlist_next (list); } return events; } #define ICALL_RECV(x) ves_icall_System_Net_Sockets_Socket_Receive_internal (\ (SOCKET)(gssize)x->handle, x->buffer, x->offset, x->size,\ x->socket_flags, &x->error); #define ICALL_SEND(x) ves_icall_System_Net_Sockets_Socket_Send_internal (\ (SOCKET)(gssize)x->handle, x->buffer, x->offset, x->size,\ x->socket_flags, &x->error); #endif /* !DISABLE_SOCKETS */ static void threadpool_jobs_inc (MonoObject *obj) { if (obj) InterlockedIncrement (&obj->vtable->domain->threadpool_jobs); } static gboolean threadpool_jobs_dec (MonoObject *obj) { MonoDomain *domain; int remaining_jobs; if (obj == NULL) return FALSE; domain = obj->vtable->domain; remaining_jobs = InterlockedDecrement (&domain->threadpool_jobs); if (remaining_jobs == 0 && domain->cleanup_semaphore) { ReleaseSemaphore (domain->cleanup_semaphore, 1, NULL); return TRUE; } return FALSE; } static MonoObject * get_io_event (MonoMList **list, gint event) { MonoObject *state; MonoMList *current; MonoMList *prev; current = *list; prev = NULL; state = NULL; while (current) { state = mono_mlist_get_data (current); if (get_event_from_state ((MonoSocketAsyncResult *) state) == event) break; state = NULL; prev = current; current = mono_mlist_next (current); } if (current) { if (prev) { mono_mlist_set_next (prev, mono_mlist_next (current)); } else { *list = mono_mlist_next (*list); } } return state; } /* * select/poll wake up when a socket is closed, but epoll just removes * the socket from its internal list without notification. */ void mono_thread_pool_remove_socket (int sock) { MonoMList *list; MonoSocketAsyncResult *state; MonoObject *ares; if (socket_io_data.inited == 0) return; EnterCriticalSection (&socket_io_data.io_lock); if (socket_io_data.sock_to_state == NULL) { LeaveCriticalSection (&socket_io_data.io_lock); return; } list = mono_g_hash_table_lookup (socket_io_data.sock_to_state, GINT_TO_POINTER (sock)); if (list) mono_g_hash_table_remove (socket_io_data.sock_to_state, GINT_TO_POINTER (sock)); LeaveCriticalSection (&socket_io_data.io_lock); while (list) { state = (MonoSocketAsyncResult *) mono_mlist_get_data (list); if (state->operation == AIO_OP_RECEIVE) state->operation = AIO_OP_RECV_JUST_CALLBACK; else if (state->operation == AIO_OP_SEND) state->operation = AIO_OP_SEND_JUST_CALLBACK; ares = get_io_event (&list, MONO_POLLIN); threadpool_append_job (&async_io_tp, ares); if (list) { ares = get_io_event (&list, MONO_POLLOUT); threadpool_append_job (&async_io_tp, ares); } } } static void init_event_system (SocketIOData *data) { #ifdef HAVE_EPOLL if (data->event_system == EPOLL_BACKEND) { data->event_data = tp_epoll_init (data); if (data->event_data == NULL) { if (g_getenv ("MONO_DEBUG")) g_message ("Falling back to poll()"); data->event_system = POLL_BACKEND; } } #elif defined(USE_KQUEUE_FOR_THREADPOOL) if (data->event_system == KQUEUE_BACKEND) data->event_data = tp_kqueue_init (data); #endif if (data->event_system == POLL_BACKEND) data->event_data = tp_poll_init (data); } static void socket_io_init (SocketIOData *data) { int inited; if (data->inited >= 2) // 2 -> initialized, 3-> cleaned up return; inited = InterlockedCompareExchange (&data->inited, 1, 0); if (inited >= 1) { while (TRUE) { if (data->inited >= 2) return; SleepEx (1, FALSE); } } EnterCriticalSection (&data->io_lock); data->sock_to_state = mono_g_hash_table_new_type (g_direct_hash, g_direct_equal, MONO_HASH_VALUE_GC); #ifdef HAVE_EPOLL data->event_system = EPOLL_BACKEND; #elif defined(USE_KQUEUE_FOR_THREADPOOL) data->event_system = KQUEUE_BACKEND; #else data->event_system = POLL_BACKEND; #endif if (g_getenv ("MONO_DISABLE_AIO") != NULL) data->event_system = POLL_BACKEND; init_event_system (data); mono_thread_create_internal (mono_get_root_domain (), data->wait, data, TRUE, FALSE, SMALL_STACK); LeaveCriticalSection (&data->io_lock); data->inited = 2; threadpool_start_thread (&async_io_tp); } static void socket_io_add (MonoAsyncResult *ares, MonoSocketAsyncResult *state) { MonoMList *list; SocketIOData *data = &socket_io_data; int fd; gboolean is_new; int ievt; socket_io_init (&socket_io_data); if (mono_runtime_is_shutting_down () || data->inited == 3 || data->sock_to_state == NULL) return; if (async_tp.pool_status == 2) return; MONO_OBJECT_SETREF (state, ares, ares); fd = GPOINTER_TO_INT (state->handle); EnterCriticalSection (&data->io_lock); if (data->sock_to_state == NULL) { LeaveCriticalSection (&data->io_lock); return; } list = mono_g_hash_table_lookup (data->sock_to_state, GINT_TO_POINTER (fd)); if (list == NULL) { list = mono_mlist_alloc ((MonoObject*)state); is_new = TRUE; } else { list = mono_mlist_append (list, (MonoObject*)state); is_new = FALSE; } mono_g_hash_table_replace (data->sock_to_state, state->handle, list); ievt = get_events_from_list (list); /* The modify function leaves the io_lock critical section. */ data->modify (data, fd, state->operation, ievt, is_new); } #ifndef DISABLE_SOCKETS static gboolean socket_io_filter (MonoObject *target, MonoObject *state) { gint op; MonoSocketAsyncResult *sock_res; MonoClass *klass; MonoDomain *domain; if (target == NULL || state == NULL) return FALSE; domain = target->vtable->domain; klass = target->vtable->klass; if (socket_async_call_klass == NULL && is_socketasynccall (domain, klass)) socket_async_call_klass = klass; if (process_async_call_klass == NULL && is_sdp_asyncreadhandler (domain, klass)) process_async_call_klass = klass; if (klass != socket_async_call_klass && klass != process_async_call_klass) return FALSE; sock_res = (MonoSocketAsyncResult *) state; op = sock_res->operation; if (op < AIO_OP_FIRST || op >= AIO_OP_LAST) return FALSE; return TRUE; } #endif /* !DISABLE_SOCKETS */ /* Returns the exception thrown when invoking, if any */ static MonoObject * mono_async_invoke (ThreadPool *tp, MonoAsyncResult *ares) { ASyncCall *ac = (ASyncCall *)ares->object_data; MonoObject *res, *exc = NULL; MonoArray *out_args = NULL; HANDLE wait_event = NULL; MonoInternalThread *thread = mono_thread_internal_current (); if (ares->execution_context) { /* use captured ExecutionContext (if available) */ MONO_OBJECT_SETREF (ares, original_context, mono_thread_get_execution_context ()); mono_thread_set_execution_context (ares->execution_context); } else { ares->original_context = NULL; } if (ac == NULL) { /* Fast path from ThreadPool.*QueueUserWorkItem */ void *pa = ares->async_state; /* The debugger needs this */ thread->async_invoke_method = ((MonoDelegate*)ares->async_delegate)->method; res = mono_runtime_delegate_invoke (ares->async_delegate, &pa, &exc); thread->async_invoke_method = NULL; } else { MonoObject *cb_exc = NULL; ac->msg->exc = NULL; res = mono_message_invoke (ares->async_delegate, ac->msg, &exc, &out_args); MONO_OBJECT_SETREF (ac, res, res); MONO_OBJECT_SETREF (ac, msg->exc, exc); MONO_OBJECT_SETREF (ac, out_args, out_args); mono_monitor_enter ((MonoObject *) ares); ares->completed = 1; if (ares->handle != NULL) wait_event = mono_wait_handle_get_handle ((MonoWaitHandle *) ares->handle); mono_monitor_exit ((MonoObject *) ares); /* notify listeners */ if (wait_event != NULL) SetEvent (wait_event); /* call async callback if cb_method != null*/ if (ac != NULL && ac->cb_method) { void *pa = &ares; cb_exc = NULL; thread->async_invoke_method = ac->cb_method; mono_runtime_invoke (ac->cb_method, ac->cb_target, pa, &cb_exc); thread->async_invoke_method = NULL; exc = cb_exc; } else { exc = NULL; } } /* restore original thread execution context if flow isn't suppressed, i.e. non null */ if (ares->original_context) { mono_thread_set_execution_context (ares->original_context); ares->original_context = NULL; } return exc; } static void threadpool_start_idle_threads (ThreadPool *tp) { int n; guint32 stack_size; stack_size = (!tp->is_io) ? 0 : SMALL_STACK; do { while (1) { n = tp->nthreads; if (n >= tp->min_threads) return; if (InterlockedCompareExchange (&tp->nthreads, n + 1, n) == n) break; } #ifndef DISABLE_PERFCOUNTERS mono_perfcounter_update_value (tp->pc_nthreads, TRUE, 1); #endif mono_thread_create_internal (mono_get_root_domain (), tp->async_invoke, tp, TRUE, FALSE, stack_size); SleepEx (100, TRUE); } while (1); } static void threadpool_init (ThreadPool *tp, int min_threads, int max_threads, void (*async_invoke) (gpointer)) { memset (tp, 0, sizeof (ThreadPool)); tp->min_threads = min_threads; tp->max_threads = max_threads; tp->async_invoke = async_invoke; tp->queue = mono_cq_create (); MONO_SEM_INIT (&tp->new_job, 0); } #ifndef DISABLE_PERFCOUNTERS static void * init_perf_counter (const char *category, const char *counter) { MonoString *category_str; MonoString *counter_str; MonoString *machine; MonoDomain *root; MonoBoolean custom; int type; if (category == NULL || counter == NULL) return NULL; root = mono_get_root_domain (); category_str = mono_string_new (root, category); counter_str = mono_string_new (root, counter); machine = mono_string_new (root, "."); return mono_perfcounter_get_impl (category_str, counter_str, NULL, machine, &type, &custom); } #endif #ifdef DEBUG static void print_pool_info (ThreadPool *tp) { // if (tp->tail - tp->head == 0) // return; g_print ("Pool status? %d\n", InterlockedCompareExchange (&tp->pool_status, 0, 0)); g_print ("Min. threads: %d\n", InterlockedCompareExchange (&tp->min_threads, 0, 0)); g_print ("Max. threads: %d\n", InterlockedCompareExchange (&tp->max_threads, 0, 0)); g_print ("nthreads: %d\n", InterlockedCompareExchange (&tp->nthreads, 0, 0)); g_print ("busy threads: %d\n", InterlockedCompareExchange (&tp->busy_threads, 0, 0)); g_print ("Waiting: %d\n", InterlockedCompareExchange (&tp->waiting, 0, 0)); g_print ("Queued: %d\n", (tp->tail - tp->head)); if (tp == &async_tp) { int i; EnterCriticalSection (&wsqs_lock); for (i = 0; i < wsqs->len; i++) { g_print ("\tWSQ %d: %d\n", i, mono_wsq_count (g_ptr_array_index (wsqs, i))); } LeaveCriticalSection (&wsqs_lock); } else { g_print ("\tSockets: %d\n", mono_g_hash_table_size (socket_io_data.sock_to_state)); } g_print ("-------------\n"); } static void signal_handler (int signo) { ThreadPool *tp; tp = &async_tp; g_print ("\n-----Non-IO-----\n"); print_pool_info (tp); tp = &async_io_tp; g_print ("\n-----IO-----\n"); print_pool_info (tp); alarm (2); } #endif static void monitor_thread (gpointer unused) { ThreadPool *pools [2]; MonoInternalThread *thread; guint32 ms; gboolean need_one; int i; pools [0] = &async_tp; pools [1] = &async_io_tp; thread = mono_thread_internal_current (); ves_icall_System_Threading_Thread_SetName_internal (thread, mono_string_new (mono_domain_get (), "Threadpool monitor")); while (1) { ms = 500; i = 10; //number of spurious awakes we tolerate before doing a round of rebalancing. do { guint32 ts; ts = mono_msec_ticks (); if (SleepEx (ms, TRUE) == 0) break; ms -= (mono_msec_ticks () - ts); if (mono_runtime_is_shutting_down ()) break; if (THREAD_WANTS_A_BREAK (thread)) mono_thread_interruption_checkpoint (); } while (ms > 0 && i--); if (mono_runtime_is_shutting_down ()) break; if (suspended) continue; for (i = 0; i < 2; i++) { ThreadPool *tp; tp = pools [i]; if (tp->waiting > 0) continue; need_one = (mono_cq_count (tp->queue) > 0); if (!need_one && !tp->is_io) { EnterCriticalSection (&wsqs_lock); for (i = 0; wsqs != NULL && i < wsqs->len; i++) { MonoWSQ *wsq; wsq = g_ptr_array_index (wsqs, i); if (mono_wsq_count (wsq) != 0) { need_one = TRUE; break; } } LeaveCriticalSection (&wsqs_lock); } if (need_one) threadpool_start_thread (tp); } } } void mono_thread_pool_init_tls (void) { mono_wsq_init (); } void mono_thread_pool_init (void) { gint threads_per_cpu = 1; gint thread_count; gint cpu_count = mono_cpu_count (); int result; if (tp_inited == 2) return; result = InterlockedCompareExchange (&tp_inited, 1, 0); if (result == 1) { while (1) { SleepEx (1, FALSE); if (tp_inited == 2) return; } } MONO_GC_REGISTER_ROOT_FIXED (socket_io_data.sock_to_state); InitializeCriticalSection (&socket_io_data.io_lock); if (g_getenv ("MONO_THREADS_PER_CPU") != NULL) { threads_per_cpu = atoi (g_getenv ("MONO_THREADS_PER_CPU")); if (threads_per_cpu < 1) threads_per_cpu = 1; } thread_count = MIN (cpu_count * threads_per_cpu, 100 * cpu_count); threadpool_init (&async_tp, thread_count, MAX (100 * cpu_count, thread_count), async_invoke_thread); threadpool_init (&async_io_tp, cpu_count * 2, cpu_count * 4, async_invoke_thread); async_io_tp.is_io = TRUE; async_call_klass = mono_class_from_name (mono_defaults.corlib, "System", "MonoAsyncCall"); g_assert (async_call_klass); InitializeCriticalSection (&wsqs_lock); wsqs = g_ptr_array_sized_new (MAX (100 * cpu_count, thread_count)); #ifndef DISABLE_PERFCOUNTERS async_tp.pc_nitems = init_perf_counter ("Mono Threadpool", "Work Items Added"); g_assert (async_tp.pc_nitems); async_io_tp.pc_nitems = init_perf_counter ("Mono Threadpool", "IO Work Items Added"); g_assert (async_io_tp.pc_nitems); async_tp.pc_nthreads = init_perf_counter ("Mono Threadpool", "# of Threads"); g_assert (async_tp.pc_nthreads); async_io_tp.pc_nthreads = init_perf_counter ("Mono Threadpool", "# of IO Threads"); g_assert (async_io_tp.pc_nthreads); #endif tp_inited = 2; #ifdef DEBUG signal (SIGALRM, signal_handler); alarm (2); #endif } static MonoAsyncResult * create_simple_asyncresult (MonoObject *target, MonoObject *state) { MonoDomain *domain = mono_domain_get (); MonoAsyncResult *ares; /* Don't call mono_async_result_new() to avoid capturing the context */ ares = (MonoAsyncResult *) mono_object_new (domain, mono_defaults.asyncresult_class); MONO_OBJECT_SETREF (ares, async_delegate, target); MONO_OBJECT_SETREF (ares, async_state, state); return ares; } void icall_append_io_job (MonoObject *target, MonoSocketAsyncResult *state) { MonoAsyncResult *ares; ares = create_simple_asyncresult (target, (MonoObject *) state); socket_io_add (ares, state); } MonoAsyncResult * mono_thread_pool_add (MonoObject *target, MonoMethodMessage *msg, MonoDelegate *async_callback, MonoObject *state) { MonoDomain *domain = mono_domain_get (); MonoAsyncResult *ares; ASyncCall *ac; ac = (ASyncCall*)mono_object_new (domain, async_call_klass); MONO_OBJECT_SETREF (ac, msg, msg); MONO_OBJECT_SETREF (ac, state, state); if (async_callback) { ac->cb_method = mono_get_delegate_invoke (((MonoObject *)async_callback)->vtable->klass); MONO_OBJECT_SETREF (ac, cb_target, async_callback); } ares = mono_async_result_new (domain, NULL, ac->state, NULL, (MonoObject*)ac); MONO_OBJECT_SETREF (ares, async_delegate, target); #ifndef DISABLE_SOCKETS if (socket_io_filter (target, state)) { socket_io_add (ares, (MonoSocketAsyncResult *) state); return ares; } #endif threadpool_append_job (&async_tp, (MonoObject *) ares); return ares; } MonoObject * mono_thread_pool_finish (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc) { ASyncCall *ac; HANDLE wait_event; *exc = NULL; *out_args = NULL; /* check if already finished */ mono_monitor_enter ((MonoObject *) ares); if (ares->endinvoke_called) { *exc = (MonoObject *) mono_get_exception_invalid_operation (NULL); mono_monitor_exit ((MonoObject *) ares); return NULL; } ares->endinvoke_called = 1; /* wait until we are really finished */ if (!ares->completed) { if (ares->handle == NULL) { wait_event = CreateEvent (NULL, TRUE, FALSE, NULL); g_assert(wait_event != 0); MONO_OBJECT_SETREF (ares, handle, (MonoObject *) mono_wait_handle_new (mono_object_domain (ares), wait_event)); } else { wait_event = mono_wait_handle_get_handle ((MonoWaitHandle *) ares->handle); } mono_monitor_exit ((MonoObject *) ares); WaitForSingleObjectEx (wait_event, INFINITE, TRUE); } else { mono_monitor_exit ((MonoObject *) ares); } ac = (ASyncCall *) ares->object_data; g_assert (ac != NULL); *exc = ac->msg->exc; /* FIXME: GC add write barrier */ *out_args = ac->out_args; return ac->res; } static void threadpool_kill_idle_threads (ThreadPool *tp) { gint n; n = (gint) InterlockedCompareExchange (&tp->max_threads, 0, -1); while (n) { n--; MONO_SEM_POST (&tp->new_job); } } void mono_thread_pool_cleanup (void) { if (InterlockedExchange (&async_io_tp.pool_status, 2) == 1) { socket_io_cleanup (&socket_io_data); /* Empty when DISABLE_SOCKETS is defined */ threadpool_kill_idle_threads (&async_io_tp); } if (async_io_tp.queue != NULL) { MONO_SEM_DESTROY (&async_io_tp.new_job); threadpool_free_queue (&async_io_tp); } if (InterlockedExchange (&async_tp.pool_status, 2) == 1) { threadpool_kill_idle_threads (&async_tp); threadpool_free_queue (&async_tp); } if (wsqs) { EnterCriticalSection (&wsqs_lock); mono_wsq_cleanup (); if (wsqs) g_ptr_array_free (wsqs, TRUE); wsqs = NULL; LeaveCriticalSection (&wsqs_lock); MONO_SEM_DESTROY (&async_tp.new_job); } } static gboolean threadpool_start_thread (ThreadPool *tp) { gint n; guint32 stack_size; stack_size = (!tp->is_io) ? 0 : SMALL_STACK; while (!mono_runtime_is_shutting_down () && (n = tp->nthreads) < tp->max_threads) { if (InterlockedCompareExchange (&tp->nthreads, n + 1, n) == n) { #ifndef DISABLE_PERFCOUNTERS mono_perfcounter_update_value (tp->pc_nthreads, TRUE, 1); #endif mono_thread_create_internal (mono_get_root_domain (), tp->async_invoke, tp, TRUE, FALSE, stack_size); return TRUE; } } return FALSE; } static void pulse_on_new_job (ThreadPool *tp) { if (tp->waiting) MONO_SEM_POST (&tp->new_job); } void icall_append_job (MonoObject *ar) { threadpool_append_jobs (&async_tp, &ar, 1); } static void threadpool_append_job (ThreadPool *tp, MonoObject *ar) { threadpool_append_jobs (tp, &ar, 1); } static void threadpool_append_jobs (ThreadPool *tp, MonoObject **jobs, gint njobs) { static int job_counter; MonoObject *ar; gint i; if (mono_runtime_is_shutting_down ()) return; if (tp->pool_status == 0 && InterlockedCompareExchange (&tp->pool_status, 1, 0) == 0) { if (!tp->is_io) { mono_thread_create_internal (mono_get_root_domain (), monitor_thread, NULL, TRUE, FALSE, SMALL_STACK); threadpool_start_thread (tp); } /* Create on demand up to min_threads to avoid startup penalty for apps that don't use * the threadpool that much */ if (mono_config_is_server_mode ()) { mono_thread_create_internal (mono_get_root_domain (), threadpool_start_idle_threads, tp, TRUE, FALSE, SMALL_STACK); } } for (i = 0; i < njobs; i++) { ar = jobs [i]; if (ar == NULL || mono_domain_is_unloading (ar->vtable->domain)) continue; /* Might happen when cleaning domain jobs */ if (!tp->is_io && (InterlockedIncrement (&job_counter) % 10) == 0) { MonoAsyncResult *o = (MonoAsyncResult *) ar; o->add_time = mono_100ns_ticks (); } threadpool_jobs_inc (ar); #ifndef DISABLE_PERFCOUNTERS mono_perfcounter_update_value (tp->pc_nitems, TRUE, 1); #endif if (!tp->is_io && mono_wsq_local_push (ar)) continue; mono_cq_enqueue (tp->queue, ar); } for (i = 0; tp->waiting > 0 && i < MIN(njobs, tp->max_threads); i++) pulse_on_new_job (tp); } static void threadpool_clear_queue (ThreadPool *tp, MonoDomain *domain) { MonoObject *obj; MonoMList *other = NULL; MonoCQ *queue = tp->queue; if (!queue) return; while (mono_cq_dequeue (queue, &obj)) { if (obj == NULL) continue; if (obj->vtable->domain != domain) other = mono_mlist_prepend (other, obj); threadpool_jobs_dec (obj); } if (mono_runtime_is_shutting_down ()) return; while (other) { threadpool_append_job (tp, (MonoObject *) mono_mlist_get_data (other)); other = mono_mlist_next (other); } } static gboolean remove_sockstate_for_domain (gpointer key, gpointer value, gpointer user_data) { MonoMList *list = value; gboolean remove = FALSE; while (list) { MonoObject *data = mono_mlist_get_data (list); if (mono_object_domain (data) == user_data) { remove = TRUE; mono_mlist_set_data (list, NULL); } list = mono_mlist_next (list); } //FIXME is there some sort of additional unregistration we need to perform here? return remove; } /* * Clean up the threadpool of all domain jobs. * Can only be called as part of the domain unloading process as * it will wait for all jobs to be visible to the interruption code. */ gboolean mono_thread_pool_remove_domain_jobs (MonoDomain *domain, int timeout) { HANDLE sem_handle; int result = TRUE; guint32 start_time = 0; g_assert (domain->state == MONO_APPDOMAIN_UNLOADING); threadpool_clear_queue (&async_tp, domain); threadpool_clear_queue (&async_io_tp, domain); EnterCriticalSection (&socket_io_data.io_lock); if (socket_io_data.sock_to_state) mono_g_hash_table_foreach_remove (socket_io_data.sock_to_state, remove_sockstate_for_domain, domain); LeaveCriticalSection (&socket_io_data.io_lock); /* * There might be some threads out that could be about to execute stuff from the given domain. * We avoid that by setting up a semaphore to be pulsed by the thread that reaches zero. */ sem_handle = CreateSemaphore (NULL, 0, 1, NULL); domain->cleanup_semaphore = sem_handle; /* * The memory barrier here is required to have global ordering between assigning to cleanup_semaphone * and reading threadpool_jobs. * Otherwise this thread could read a stale version of threadpool_jobs and wait forever. */ mono_memory_write_barrier (); if (domain->threadpool_jobs && timeout != -1) start_time = mono_msec_ticks (); while (domain->threadpool_jobs) { WaitForSingleObject (sem_handle, timeout); if (timeout != -1 && (mono_msec_ticks () - start_time) > timeout) { result = FALSE; break; } } domain->cleanup_semaphore = NULL; CloseHandle (sem_handle); return result; } static void threadpool_free_queue (ThreadPool *tp) { mono_cq_destroy (tp->queue); tp->queue = NULL; } gboolean mono_thread_pool_is_queue_array (MonoArray *o) { // gpointer obj = o; // FIXME: need some fix in sgen code. return FALSE; } static MonoWSQ * add_wsq (void) { int i; MonoWSQ *wsq; EnterCriticalSection (&wsqs_lock); wsq = mono_wsq_create (); if (wsqs == NULL) { LeaveCriticalSection (&wsqs_lock); return NULL; } for (i = 0; i < wsqs->len; i++) { if (g_ptr_array_index (wsqs, i) == NULL) { wsqs->pdata [i] = wsq; LeaveCriticalSection (&wsqs_lock); return wsq; } } g_ptr_array_add (wsqs, wsq); LeaveCriticalSection (&wsqs_lock); return wsq; } static void remove_wsq (MonoWSQ *wsq) { gpointer data; if (wsq == NULL) return; EnterCriticalSection (&wsqs_lock); if (wsqs == NULL) { LeaveCriticalSection (&wsqs_lock); return; } g_ptr_array_remove_fast (wsqs, wsq); data = NULL; /* * Only clean this up when shutting down, any other case will error out * if we're removing a queue that still has work items. */ if (mono_runtime_is_shutting_down ()) { while (mono_wsq_local_pop (&data)) { threadpool_jobs_dec (data); data = NULL; } } mono_wsq_destroy (wsq); LeaveCriticalSection (&wsqs_lock); } static void try_steal (MonoWSQ *local_wsq, gpointer *data, gboolean retry) { int i; int ms; if (wsqs == NULL || data == NULL || *data != NULL) return; ms = 0; do { if (mono_runtime_is_shutting_down ()) return; EnterCriticalSection (&wsqs_lock); for (i = 0; wsqs != NULL && i < wsqs->len; i++) { MonoWSQ *wsq; wsq = wsqs->pdata [i]; if (wsq == local_wsq || mono_wsq_count (wsq) == 0) continue; mono_wsq_try_steal (wsqs->pdata [i], data, ms); if (*data != NULL) { LeaveCriticalSection (&wsqs_lock); return; } } LeaveCriticalSection (&wsqs_lock); ms += 10; } while (retry && ms < 11); } static gboolean dequeue_or_steal (ThreadPool *tp, gpointer *data, MonoWSQ *local_wsq) { if (mono_runtime_is_shutting_down ()) return FALSE; mono_cq_dequeue (tp->queue, (MonoObject **) data); if (!tp->is_io && !*data) try_steal (local_wsq, data, FALSE); return (*data != NULL); } static void process_idle_times (ThreadPool *tp, gint64 t) { gint64 ticks; gint64 avg; gboolean compute_avg; gint new_threads; gint64 per1; if (tp->ignore_times || t <= 0) return; compute_avg = FALSE; ticks = mono_100ns_ticks (); t = ticks - t; SPIN_LOCK (tp->sp_lock); if (tp->ignore_times) { SPIN_UNLOCK (tp->sp_lock); return; } tp->time_sum += t; tp->n_sum++; if (tp->last_check == 0) tp->last_check = ticks; else if (tp->last_check > 0 && (ticks - tp->last_check) > 5000000) { tp->ignore_times = 1; compute_avg = TRUE; } SPIN_UNLOCK (tp->sp_lock); if (!compute_avg) return; //printf ("Items: %d Time elapsed: %.3fs\n", tp->n_sum, (ticks - tp->last_check) / 10000.0); tp->last_check = ticks; new_threads = 0; avg = tp->time_sum / tp->n_sum; if (tp->averages [1] == 0) { tp->averages [1] = avg; } else { per1 = ((100 * (ABS (avg - tp->averages [1]))) / tp->averages [1]); if (per1 > 5) { if (avg > tp->averages [1]) { if (tp->averages [1] < tp->averages [0]) { new_threads = -1; } else { new_threads = 1; } } else if (avg < tp->averages [1] && tp->averages [1] < tp->averages [0]) { new_threads = 1; } } else { int min, n; min = tp->min_threads; n = tp->nthreads; if ((n - min) < min && tp->busy_threads == n) new_threads = 1; } /* if (new_threads != 0) { printf ("n: %d per1: %lld avg=%lld avg1=%lld avg0=%lld\n", new_threads, per1, avg, tp->averages [1], tp->averages [0]); } */ } tp->time_sum = 0; tp->n_sum = 0; tp->averages [0] = tp->averages [1]; tp->averages [1] = avg; tp->ignore_times = 0; if (new_threads == -1) { if (tp->destroy_thread == 0 && InterlockedCompareExchange (&tp->destroy_thread, 1, 0) == 0) pulse_on_new_job (tp); } } static gboolean should_i_die (ThreadPool *tp) { gboolean result = FALSE; if (tp->destroy_thread == 1 && InterlockedCompareExchange (&tp->destroy_thread, 0, 1) == 1) result = (tp->nthreads > tp->min_threads); return result; } static void set_tp_thread_info (ThreadPool *tp) { const gchar *name; MonoInternalThread *thread = mono_thread_internal_current (); mono_profiler_thread_start (thread->tid); name = (tp->is_io) ? "IO Threadpool worker" : "Threadpool worker"; mono_thread_set_name_internal (thread, mono_string_new (mono_domain_get (), name), FALSE); } static void clear_thread_state (void) { MonoInternalThread *thread = mono_thread_internal_current (); /* If the callee changes the background status, set it back to TRUE */ mono_thread_clr_state (thread , ~ThreadState_Background); if (!mono_thread_test_state (thread , ThreadState_Background)) ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background); } static void check_for_interruption_critical (void) { MonoInternalThread *thread; /*RULE NUMBER ONE OF SKIP_THREAD: NEVER POKE MANAGED STATE.*/ mono_gc_set_skip_thread (FALSE); thread = mono_thread_internal_current (); if (THREAD_WANTS_A_BREAK (thread)) mono_thread_interruption_checkpoint (); /*RULE NUMBER TWO OF SKIP_THREAD: READ RULE NUMBER ONE.*/ mono_gc_set_skip_thread (TRUE); } static void fire_profiler_thread_end (void) { MonoInternalThread *thread = mono_thread_internal_current (); mono_profiler_thread_end (thread->tid); } static void async_invoke_thread (gpointer data) { MonoDomain *domain; MonoWSQ *wsq; ThreadPool *tp; gboolean must_die; tp = data; wsq = NULL; if (!tp->is_io) wsq = add_wsq (); set_tp_thread_info (tp); if (tp_start_func) tp_start_func (tp_hooks_user_data); data = NULL; for (;;) { MonoAsyncResult *ar; MonoClass *klass; gboolean is_io_task; gboolean is_socket; int n_naps = 0; is_io_task = FALSE; ar = (MonoAsyncResult *) data; if (ar) { InterlockedIncrement (&tp->busy_threads); domain = ((MonoObject *)ar)->vtable->domain; #ifndef DISABLE_SOCKETS klass = ((MonoObject *) data)->vtable->klass; is_io_task = !is_corlib_asyncresult (domain, klass); is_socket = FALSE; if (is_io_task) { MonoSocketAsyncResult *state = (MonoSocketAsyncResult *) data; is_socket = is_socketasyncresult (domain, klass); ar = state->ares; switch (state->operation) { case AIO_OP_RECEIVE: state->total = ICALL_RECV (state); break; case AIO_OP_SEND: state->total = ICALL_SEND (state); break; } } #endif /* worker threads invokes methods in different domains, * so we need to set the right domain here */ g_assert (domain); if (mono_domain_is_unloading (domain) || mono_runtime_is_shutting_down ()) { threadpool_jobs_dec ((MonoObject *)ar); data = NULL; ar = NULL; InterlockedDecrement (&tp->busy_threads); } else { mono_thread_push_appdomain_ref (domain); if (threadpool_jobs_dec ((MonoObject *)ar)) { data = NULL; ar = NULL; mono_thread_pop_appdomain_ref (); InterlockedDecrement (&tp->busy_threads); continue; } if (mono_domain_set (domain, FALSE)) { MonoObject *exc; if (tp_item_begin_func) tp_item_begin_func (tp_item_user_data); if (!is_io_task && ar->add_time > 0) process_idle_times (tp, ar->add_time); exc = mono_async_invoke (tp, ar); if (tp_item_end_func) tp_item_end_func (tp_item_user_data); if (exc) mono_internal_thread_unhandled_exception (exc); if (is_socket && tp->is_io) { MonoSocketAsyncResult *state = (MonoSocketAsyncResult *) data; if (state->completed && state->callback) { MonoAsyncResult *cb_ares; cb_ares = create_simple_asyncresult ((MonoObject *) state->callback, (MonoObject *) state); icall_append_job ((MonoObject *) cb_ares); } } mono_domain_set (mono_get_root_domain (), TRUE); } mono_thread_pop_appdomain_ref (); InterlockedDecrement (&tp->busy_threads); clear_thread_state (); } } ar = NULL; data = NULL; must_die = should_i_die (tp); if (!must_die && (tp->is_io || !mono_wsq_local_pop (&data))) dequeue_or_steal (tp, &data, wsq); n_naps = 0; while (!must_die && !data && n_naps < 4) { gboolean res; InterlockedIncrement (&tp->waiting); // Another thread may have added a job into its wsq since the last call to dequeue_or_steal // Check all the queues again before entering the wait loop dequeue_or_steal (tp, &data, wsq); if (data) { InterlockedDecrement (&tp->waiting); break; } mono_gc_set_skip_thread (TRUE); #if defined(__OpenBSD__) while (mono_cq_count (tp->queue) == 0 && (res = mono_sem_wait (&tp->new_job, TRUE)) == -1) {// && errno == EINTR) { #else while (mono_cq_count (tp->queue) == 0 && (res = mono_sem_timedwait (&tp->new_job, 2000, TRUE)) == -1) {// && errno == EINTR) { #endif if (mono_runtime_is_shutting_down ()) break; check_for_interruption_critical (); } InterlockedDecrement (&tp->waiting); mono_gc_set_skip_thread (FALSE); if (mono_runtime_is_shutting_down ()) break; must_die = should_i_die (tp); dequeue_or_steal (tp, &data, wsq); n_naps++; } if (!data && !tp->is_io && !mono_runtime_is_shutting_down ()) { mono_wsq_local_pop (&data); if (data && must_die) { InterlockedCompareExchange (&tp->destroy_thread, 1, 0); pulse_on_new_job (tp); } } if (!data) { gint nt; gboolean down; while (1) { nt = tp->nthreads; down = mono_runtime_is_shutting_down (); if (!down && nt <= tp->min_threads) break; if (down || InterlockedCompareExchange (&tp->nthreads, nt - 1, nt) == nt) { #ifndef DISABLE_PERFCOUNTERS mono_perfcounter_update_value (tp->pc_nthreads, TRUE, -1); #endif if (!tp->is_io) { remove_wsq (wsq); } fire_profiler_thread_end (); if (tp_finish_func) tp_finish_func (tp_hooks_user_data); return; } } } } g_assert_not_reached (); } void ves_icall_System_Threading_ThreadPool_GetAvailableThreads (gint *workerThreads, gint *completionPortThreads) { *workerThreads = async_tp.max_threads - async_tp.busy_threads; *completionPortThreads = async_io_tp.max_threads - async_io_tp.busy_threads; } void ves_icall_System_Threading_ThreadPool_GetMaxThreads (gint *workerThreads, gint *completionPortThreads) { *workerThreads = async_tp.max_threads; *completionPortThreads = async_io_tp.max_threads; } void ves_icall_System_Threading_ThreadPool_GetMinThreads (gint *workerThreads, gint *completionPortThreads) { *workerThreads = async_tp.min_threads; *completionPortThreads = async_io_tp.min_threads; } MonoBoolean ves_icall_System_Threading_ThreadPool_SetMinThreads (gint workerThreads, gint completionPortThreads) { gint max_threads; gint max_io_threads; max_threads = async_tp.max_threads; if (workerThreads <= 0 || workerThreads > max_threads) return FALSE; max_io_threads = async_io_tp.max_threads; if (completionPortThreads <= 0 || completionPortThreads > max_io_threads) return FALSE; InterlockedExchange (&async_tp.min_threads, workerThreads); InterlockedExchange (&async_io_tp.min_threads, completionPortThreads); if (workerThreads > async_tp.nthreads) mono_thread_create_internal (mono_get_root_domain (), threadpool_start_idle_threads, &async_tp, TRUE, FALSE, SMALL_STACK); if (completionPortThreads > async_io_tp.nthreads) mono_thread_create_internal (mono_get_root_domain (), threadpool_start_idle_threads, &async_io_tp, TRUE, FALSE, SMALL_STACK); return TRUE; } MonoBoolean ves_icall_System_Threading_ThreadPool_SetMaxThreads (gint workerThreads, gint completionPortThreads) { gint min_threads; gint min_io_threads; gint cpu_count; cpu_count = mono_cpu_count (); min_threads = async_tp.min_threads; if (workerThreads < min_threads || workerThreads < cpu_count) return FALSE; /* We don't really have the concept of completion ports. Do we care here? */ min_io_threads = async_io_tp.min_threads; if (completionPortThreads < min_io_threads || completionPortThreads < cpu_count) return FALSE; InterlockedExchange (&async_tp.max_threads, workerThreads); InterlockedExchange (&async_io_tp.max_threads, completionPortThreads); return TRUE; } /** * mono_install_threadpool_thread_hooks * @start_func: the function to be called right after a new threadpool thread is created. Can be NULL. * @finish_func: the function to be called right before a thredpool thread is exiting. Can be NULL. * @user_data: argument passed to @start_func and @finish_func. * * @start_fun will be called right after a threadpool thread is created and @finish_func right before a threadpool thread exits. * The calls will be made from the thread itself. */ void mono_install_threadpool_thread_hooks (MonoThreadPoolFunc start_func, MonoThreadPoolFunc finish_func, gpointer user_data) { tp_start_func = start_func; tp_finish_func = finish_func; tp_hooks_user_data = user_data; } /** * mono_install_threadpool_item_hooks * @begin_func: the function to be called before a threadpool work item processing starts. * @end_func: the function to be called after a threadpool work item is finished. * @user_data: argument passed to @begin_func and @end_func. * * The calls will be made from the thread itself and from the same AppDomain * where the work item was executed. * */ void mono_install_threadpool_item_hooks (MonoThreadPoolItemFunc begin_func, MonoThreadPoolItemFunc end_func, gpointer user_data) { tp_item_begin_func = begin_func; tp_item_end_func = end_func; tp_item_user_data = user_data; } void mono_internal_thread_unhandled_exception (MonoObject* exc) { if (mono_runtime_unhandled_exception_policy_get () == MONO_UNHANDLED_POLICY_CURRENT) { gboolean unloaded; MonoClass *klass; klass = exc->vtable->klass; unloaded = is_appdomainunloaded_exception (exc->vtable->domain, klass); if (!unloaded && klass != mono_defaults.threadabortexception_class) { mono_unhandled_exception (exc); if (mono_environment_exitcode_get () == 1) exit (255); } if (klass == mono_defaults.threadabortexception_class) mono_thread_internal_reset_abort (mono_thread_internal_current ()); } } /* * Suspend creation of new threads. */ void mono_thread_pool_suspend (void) { suspended = TRUE; } /* * Resume creation of new threads. */ void mono_thread_pool_resume (void) { suspended = FALSE; }