2 * threadpool-ms.c: Microsoft threadpool runtime support
5 * Ludovic Henry (ludovic.henry@xamarin.com)
7 * Copyright 2015 Xamarin, Inc (http://www.xamarin.com)
8 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
12 // Copyright (c) Microsoft. All rights reserved.
13 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
16 // - src/vm/comthreadpool.cpp
17 // - src/vm/win32threadpoolcpp
18 // - src/vm/threadpoolrequest.cpp
19 // - src/vm/hillclimbing.cpp
21 // Ported from C++ to C and adjusted to Mono runtime
24 #define _USE_MATH_DEFINES // needed by MSVC to define math constants
29 #include <mono/metadata/class-internals.h>
30 #include <mono/metadata/exception.h>
31 #include <mono/metadata/gc-internals.h>
32 #include <mono/metadata/object.h>
33 #include <mono/metadata/object-internals.h>
34 #include <mono/metadata/threadpool-ms.h>
35 #include <mono/metadata/threadpool-ms-io.h>
36 #include <mono/utils/atomic.h>
37 #include <mono/utils/mono-compiler.h>
38 #include <mono/utils/mono-complex.h>
39 #include <mono/utils/mono-lazy-init.h>
40 #include <mono/utils/mono-logger.h>
41 #include <mono/utils/mono-logger-internals.h>
42 #include <mono/utils/mono-proclib.h>
43 #include <mono/utils/mono-threads.h>
44 #include <mono/utils/mono-time.h>
45 #include <mono/utils/mono-rand.h>
47 #define CPU_USAGE_LOW 80
48 #define CPU_USAGE_HIGH 95
50 #define MONITOR_INTERVAL 500 // ms
51 #define MONITOR_MINIMAL_LIFETIME 60 * 1000 // ms
53 #define WORKER_CREATION_MAX_PER_SEC 10
55 /* The exponent to apply to the gain. 1.0 means to use linear gain,
56 * higher values will enhance large moves and damp small ones.
58 #define HILL_CLIMBING_GAIN_EXPONENT 2.0
60 /* The 'cost' of a thread. 0 means drive for increased throughput regardless
61 * of thread count, higher values bias more against higher thread counts.
63 #define HILL_CLIMBING_BIAS 0.15
65 #define HILL_CLIMBING_WAVE_PERIOD 4
66 #define HILL_CLIMBING_MAX_WAVE_MAGNITUDE 20
67 #define HILL_CLIMBING_WAVE_MAGNITUDE_MULTIPLIER 1.0
68 #define HILL_CLIMBING_WAVE_HISTORY_SIZE 8
69 #define HILL_CLIMBING_TARGET_SIGNAL_TO_NOISE_RATIO 3.0
70 #define HILL_CLIMBING_MAX_CHANGE_PER_SECOND 4
71 #define HILL_CLIMBING_MAX_CHANGE_PER_SAMPLE 20
72 #define HILL_CLIMBING_SAMPLE_INTERVAL_LOW 10
73 #define HILL_CLIMBING_SAMPLE_INTERVAL_HIGH 200
74 #define HILL_CLIMBING_ERROR_SMOOTHING_FACTOR 0.01
75 #define HILL_CLIMBING_MAX_SAMPLE_ERROR_PERCENT 0.15
79 gint16 max_working; /* determined by heuristic */
80 gint16 active; /* executing worker_thread */
81 gint16 working; /* actively executing worker_thread, not parked */
82 gint16 parked; /* parked */
89 gint32 outstanding_request;
92 typedef MonoInternalThread ThreadPoolWorkingThread;
96 gint32 samples_to_measure;
97 gdouble target_throughput_ratio;
98 gdouble target_signal_to_noise_ratio;
99 gdouble max_change_per_second;
100 gdouble max_change_per_sample;
101 gint32 max_thread_wave_magnitude;
102 gint32 sample_interval_low;
103 gdouble thread_magnitude_multiplier;
104 gint32 sample_interval_high;
105 gdouble throughput_error_smoothing_factor;
106 gdouble gain_exponent;
107 gdouble max_sample_error;
109 gdouble current_control_setting;
110 gint64 total_samples;
111 gint16 last_thread_count;
112 gdouble elapsed_since_last_change;
113 gdouble completions_since_last_change;
115 gdouble average_throughput_noise;
118 gdouble *thread_counts;
120 guint32 current_sample_interval;
121 gpointer random_interval_generator;
123 gint32 accumulated_completion_count;
124 gdouble accumulated_sample_duration;
125 } ThreadPoolHillClimbing;
128 ThreadPoolCounter counters;
130 GPtrArray *domains; // ThreadPoolDomain* []
131 MonoCoopMutex domains_lock;
133 GPtrArray *working_threads; // ThreadPoolWorkingThread* []
134 gint32 parked_threads_count;
135 MonoCoopCond parked_threads_cond;
136 MonoCoopMutex active_threads_lock; /* protect access to working_threads and parked_threads */
138 guint32 worker_creation_current_second;
139 guint32 worker_creation_current_count;
140 MonoCoopMutex worker_creation_lock;
142 gint32 heuristic_completions;
143 gint64 heuristic_sample_start;
144 gint64 heuristic_last_dequeue; // ms
145 gint64 heuristic_last_adjustment; // ms
146 gint64 heuristic_adjustment_interval; // ms
147 ThreadPoolHillClimbing heuristic_hill_climbing;
148 MonoCoopMutex heuristic_lock;
150 gint32 limit_worker_min;
151 gint32 limit_worker_max;
155 MonoCpuUsageState *cpu_usage_state;
158 /* suspended by the debugger */
165 } ThreadPoolDomainCleanupSemaphore;
169 TRANSITION_INITIALIZING,
170 TRANSITION_RANDOM_MOVE,
171 TRANSITION_CLIMBING_MOVE,
172 TRANSITION_CHANGE_POINT,
173 TRANSITION_STABILIZING,
174 TRANSITION_STARVATION,
175 TRANSITION_THREAD_TIMED_OUT,
176 TRANSITION_UNDEFINED,
177 } ThreadPoolHeuristicStateTransition;
179 static mono_lazy_init_t status = MONO_LAZY_INIT_STATUS_NOT_INITIALIZED;
182 MONITOR_STATUS_REQUESTED,
183 MONITOR_STATUS_WAITING_FOR_REQUEST,
184 MONITOR_STATUS_NOT_RUNNING,
187 static gint32 monitor_status = MONITOR_STATUS_NOT_RUNNING;
189 static ThreadPool* threadpool;
191 #define COUNTER_CHECK(counter) \
193 g_assert (counter._.max_working > 0); \
194 g_assert (counter._.working >= 0); \
195 g_assert (counter._.active >= 0); \
198 #define COUNTER_READ() (InterlockedRead64 (&threadpool->counters.as_gint64))
200 #define COUNTER_ATOMIC(var,block) \
202 ThreadPoolCounter __old; \
204 g_assert (threadpool); \
205 __old.as_gint64 = COUNTER_READ (); \
208 COUNTER_CHECK (var); \
209 } while (InterlockedCompareExchange64 (&threadpool->counters.as_gint64, (var).as_gint64, __old.as_gint64) != __old.as_gint64); \
212 #define COUNTER_TRY_ATOMIC(res,var,block) \
214 ThreadPoolCounter __old; \
216 g_assert (threadpool); \
217 __old.as_gint64 = COUNTER_READ (); \
221 COUNTER_CHECK (var); \
222 (res) = InterlockedCompareExchange64 (&threadpool->counters.as_gint64, (var).as_gint64, __old.as_gint64) == __old.as_gint64; \
230 return mono_rand_init (NULL, 0);
234 rand_next (gpointer *handle, guint32 min, guint32 max)
238 mono_rand_try_get_uint32 (handle, &val, min, max, &error);
239 // FIXME handle error
240 mono_error_assert_ok (&error);
245 rand_free (gpointer handle)
247 mono_rand_close (handle);
253 ThreadPoolHillClimbing *hc;
254 const char *threads_per_cpu_env;
255 gint threads_per_cpu;
258 g_assert (!threadpool);
259 threadpool = g_new0 (ThreadPool, 1);
260 g_assert (threadpool);
262 threadpool->domains = g_ptr_array_new ();
263 mono_coop_mutex_init (&threadpool->domains_lock);
265 threadpool->parked_threads_count = 0;
266 mono_coop_cond_init (&threadpool->parked_threads_cond);
267 threadpool->working_threads = g_ptr_array_new ();
268 mono_coop_mutex_init (&threadpool->active_threads_lock);
270 threadpool->worker_creation_current_second = -1;
271 mono_coop_mutex_init (&threadpool->worker_creation_lock);
273 threadpool->heuristic_adjustment_interval = 10;
274 mono_coop_mutex_init (&threadpool->heuristic_lock);
278 hc = &threadpool->heuristic_hill_climbing;
280 hc->wave_period = HILL_CLIMBING_WAVE_PERIOD;
281 hc->max_thread_wave_magnitude = HILL_CLIMBING_MAX_WAVE_MAGNITUDE;
282 hc->thread_magnitude_multiplier = (gdouble) HILL_CLIMBING_WAVE_MAGNITUDE_MULTIPLIER;
283 hc->samples_to_measure = hc->wave_period * HILL_CLIMBING_WAVE_HISTORY_SIZE;
284 hc->target_throughput_ratio = (gdouble) HILL_CLIMBING_BIAS;
285 hc->target_signal_to_noise_ratio = (gdouble) HILL_CLIMBING_TARGET_SIGNAL_TO_NOISE_RATIO;
286 hc->max_change_per_second = (gdouble) HILL_CLIMBING_MAX_CHANGE_PER_SECOND;
287 hc->max_change_per_sample = (gdouble) HILL_CLIMBING_MAX_CHANGE_PER_SAMPLE;
288 hc->sample_interval_low = HILL_CLIMBING_SAMPLE_INTERVAL_LOW;
289 hc->sample_interval_high = HILL_CLIMBING_SAMPLE_INTERVAL_HIGH;
290 hc->throughput_error_smoothing_factor = (gdouble) HILL_CLIMBING_ERROR_SMOOTHING_FACTOR;
291 hc->gain_exponent = (gdouble) HILL_CLIMBING_GAIN_EXPONENT;
292 hc->max_sample_error = (gdouble) HILL_CLIMBING_MAX_SAMPLE_ERROR_PERCENT;
293 hc->current_control_setting = 0;
294 hc->total_samples = 0;
295 hc->last_thread_count = 0;
296 hc->average_throughput_noise = 0;
297 hc->elapsed_since_last_change = 0;
298 hc->accumulated_completion_count = 0;
299 hc->accumulated_sample_duration = 0;
300 hc->samples = g_new0 (gdouble, hc->samples_to_measure);
301 hc->thread_counts = g_new0 (gdouble, hc->samples_to_measure);
302 hc->random_interval_generator = rand_create ();
303 hc->current_sample_interval = rand_next (&hc->random_interval_generator, hc->sample_interval_low, hc->sample_interval_high);
305 if (!(threads_per_cpu_env = g_getenv ("MONO_THREADS_PER_CPU")))
308 threads_per_cpu = CLAMP (atoi (threads_per_cpu_env), 1, 50);
310 threads_count = mono_cpu_count () * threads_per_cpu;
312 threadpool->limit_worker_min = threadpool->limit_io_min = threads_count;
314 #if defined (PLATFORM_ANDROID) || defined (HOST_IOS)
315 threadpool->limit_worker_max = threadpool->limit_io_max = CLAMP (threads_count * 100, MIN (threads_count, 200), MAX (threads_count, 200));
317 threadpool->limit_worker_max = threadpool->limit_io_max = threads_count * 100;
320 threadpool->counters._.max_working = threadpool->limit_worker_min;
322 threadpool->cpu_usage_state = g_new0 (MonoCpuUsageState, 1);
324 threadpool->suspended = FALSE;
327 static void worker_kill (ThreadPoolWorkingThread *thread);
334 /* we make the assumption along the code that we are
335 * cleaning up only if the runtime is shutting down */
336 g_assert (mono_runtime_is_shutting_down ());
338 while (monitor_status != MONITOR_STATUS_NOT_RUNNING)
339 mono_thread_info_sleep (1, NULL);
341 mono_coop_mutex_lock (&threadpool->active_threads_lock);
343 /* stop all threadpool->working_threads */
344 for (i = 0; i < threadpool->working_threads->len; ++i)
345 worker_kill ((ThreadPoolWorkingThread*) g_ptr_array_index (threadpool->working_threads, i));
347 /* unpark all threadpool->parked_threads */
348 mono_coop_cond_broadcast (&threadpool->parked_threads_cond);
350 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
354 mono_threadpool_ms_enqueue_work_item (MonoDomain *domain, MonoObject *work_item, MonoError *error)
356 static MonoClass *threadpool_class = NULL;
357 static MonoMethod *unsafe_queue_custom_work_item_method = NULL;
358 MonoDomain *current_domain;
362 mono_error_init (error);
363 g_assert (work_item);
365 if (!threadpool_class)
366 threadpool_class = mono_class_load_from_name (mono_defaults.corlib, "System.Threading", "ThreadPool");
368 if (!unsafe_queue_custom_work_item_method)
369 unsafe_queue_custom_work_item_method = mono_class_get_method_from_name (threadpool_class, "UnsafeQueueCustomWorkItem", 2);
370 g_assert (unsafe_queue_custom_work_item_method);
374 args [0] = (gpointer) work_item;
375 args [1] = (gpointer) &f;
377 current_domain = mono_domain_get ();
378 if (current_domain == domain) {
379 mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
380 return_val_if_nok (error, FALSE);
382 mono_thread_push_appdomain_ref (domain);
383 if (mono_domain_set (domain, FALSE)) {
384 mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
385 if (!is_ok (error)) {
386 mono_thread_pop_appdomain_ref ();
389 mono_domain_set (current_domain, TRUE);
391 mono_thread_pop_appdomain_ref ();
396 /* LOCKING: threadpool->domains_lock must be held */
398 domain_add (ThreadPoolDomain *tpdomain)
404 len = threadpool->domains->len;
405 for (i = 0; i < len; ++i) {
406 if (g_ptr_array_index (threadpool->domains, i) == tpdomain)
411 g_ptr_array_add (threadpool->domains, tpdomain);
414 /* LOCKING: threadpool->domains_lock must be held */
416 domain_remove (ThreadPoolDomain *tpdomain)
419 return g_ptr_array_remove (threadpool->domains, tpdomain);
422 /* LOCKING: threadpool->domains_lock must be held */
423 static ThreadPoolDomain *
424 domain_get (MonoDomain *domain, gboolean create)
426 ThreadPoolDomain *tpdomain = NULL;
431 for (i = 0; i < threadpool->domains->len; ++i) {
432 tpdomain = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i);
433 if (tpdomain->domain == domain)
438 ThreadPoolDomainCleanupSemaphore *cleanup_semaphore;
439 cleanup_semaphore = g_new0 (ThreadPoolDomainCleanupSemaphore, 1);
440 cleanup_semaphore->ref = 2;
441 mono_coop_sem_init (&cleanup_semaphore->sem, 0);
443 g_assert(!domain->cleanup_semaphore);
444 domain->cleanup_semaphore = cleanup_semaphore;
446 tpdomain = g_new0 (ThreadPoolDomain, 1);
447 tpdomain->domain = domain;
448 domain_add (tpdomain);
455 domain_free (ThreadPoolDomain *tpdomain)
460 /* LOCKING: threadpool->domains_lock must be held */
462 domain_any_has_request (void)
466 for (i = 0; i < threadpool->domains->len; ++i) {
467 ThreadPoolDomain *tmp = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i);
468 if (tmp->outstanding_request > 0)
475 /* LOCKING: threadpool->domains_lock must be held */
476 static ThreadPoolDomain *
477 domain_get_next (ThreadPoolDomain *current)
479 ThreadPoolDomain *tpdomain = NULL;
482 len = threadpool->domains->len;
484 guint i, current_idx = -1;
486 for (i = 0; i < len; ++i) {
487 if (current == g_ptr_array_index (threadpool->domains, i)) {
492 g_assert (current_idx != (guint)-1);
494 for (i = current_idx + 1; i < len + current_idx + 1; ++i) {
495 ThreadPoolDomain *tmp = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i % len);
496 if (tmp->outstanding_request > 0) {
507 worker_wait_interrupt (gpointer data)
509 mono_coop_mutex_lock (&threadpool->active_threads_lock);
510 mono_coop_cond_signal (&threadpool->parked_threads_cond);
511 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
514 /* return TRUE if timeout, FALSE otherwise (worker unpark or interrupt) */
518 gboolean timeout = FALSE;
520 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] current worker parking", mono_native_thread_id_get ());
522 mono_gc_set_skip_thread (TRUE);
524 mono_coop_mutex_lock (&threadpool->active_threads_lock);
526 if (!mono_runtime_is_shutting_down ()) {
527 static gpointer rand_handle = NULL;
528 MonoInternalThread *thread_internal;
529 gboolean interrupted = FALSE;
532 rand_handle = rand_create ();
533 g_assert (rand_handle);
535 thread_internal = mono_thread_internal_current ();
536 g_assert (thread_internal);
538 threadpool->parked_threads_count += 1;
539 g_ptr_array_remove_fast (threadpool->working_threads, thread_internal);
541 mono_thread_info_install_interrupt (worker_wait_interrupt, NULL, &interrupted);
545 if (mono_coop_cond_timedwait (&threadpool->parked_threads_cond, &threadpool->active_threads_lock, rand_next (&rand_handle, 5 * 1000, 60 * 1000)) != 0)
548 mono_thread_info_uninstall_interrupt (&interrupted);
551 g_ptr_array_add (threadpool->working_threads, thread_internal);
552 threadpool->parked_threads_count -= 1;
555 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
557 mono_gc_set_skip_thread (FALSE);
559 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] current worker unparking, timeout? %s", mono_native_thread_id_get (), timeout ? "yes" : "no");
565 worker_try_unpark (void)
567 gboolean res = FALSE;
569 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try unpark worker", mono_native_thread_id_get ());
571 mono_coop_mutex_lock (&threadpool->active_threads_lock);
572 if (threadpool->parked_threads_count > 0) {
573 mono_coop_cond_signal (&threadpool->parked_threads_cond);
576 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
578 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try unpark worker, success? %s", mono_native_thread_id_get (), res ? "yes" : "no");
584 worker_kill (ThreadPoolWorkingThread *thread)
586 if (thread == mono_thread_internal_current ())
589 mono_thread_internal_stop ((MonoInternalThread*) thread);
593 worker_thread (gpointer data)
596 MonoInternalThread *thread;
597 ThreadPoolDomain *tpdomain, *previous_tpdomain;
598 ThreadPoolCounter counter;
599 gboolean retire = FALSE;
601 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_THREADPOOL, "[%p] worker starting", mono_native_thread_id_get ());
603 g_assert (threadpool);
605 thread = mono_thread_internal_current ();
608 mono_thread_set_name_internal (thread, mono_string_new (mono_get_root_domain (), "Threadpool worker"), FALSE, &error);
609 mono_error_assert_ok (&error);
611 mono_coop_mutex_lock (&threadpool->active_threads_lock);
612 g_ptr_array_add (threadpool->working_threads, thread);
613 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
615 previous_tpdomain = NULL;
617 mono_coop_mutex_lock (&threadpool->domains_lock);
619 while (!mono_runtime_is_shutting_down ()) {
622 if ((thread->state & (ThreadState_StopRequested | ThreadState_SuspendRequested)) != 0) {
623 mono_coop_mutex_unlock (&threadpool->domains_lock);
624 mono_thread_interruption_checkpoint ();
625 mono_coop_mutex_lock (&threadpool->domains_lock);
628 if (retire || !(tpdomain = domain_get_next (previous_tpdomain))) {
631 COUNTER_ATOMIC (counter, {
632 counter._.working --;
636 mono_coop_mutex_unlock (&threadpool->domains_lock);
637 timeout = worker_park ();
638 mono_coop_mutex_lock (&threadpool->domains_lock);
640 COUNTER_ATOMIC (counter, {
641 counter._.working ++;
651 /* The tpdomain->domain might have unloaded, while this thread was parked */
652 previous_tpdomain = NULL;
657 tpdomain->outstanding_request --;
658 g_assert (tpdomain->outstanding_request >= 0);
660 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] worker running in domain %p",
661 mono_native_thread_id_get (), tpdomain->domain, tpdomain->outstanding_request);
663 g_assert (tpdomain->domain);
664 g_assert (tpdomain->domain->threadpool_jobs >= 0);
665 tpdomain->domain->threadpool_jobs ++;
667 mono_coop_mutex_unlock (&threadpool->domains_lock);
669 mono_thread_push_appdomain_ref (tpdomain->domain);
670 if (mono_domain_set (tpdomain->domain, FALSE)) {
671 MonoObject *exc = NULL, *res;
673 res = mono_runtime_try_invoke (mono_defaults.threadpool_perform_wait_callback_method, NULL, NULL, &exc, &error);
674 if (exc || !mono_error_ok(&error)) {
676 exc = (MonoObject *) mono_error_convert_to_exception (&error);
678 mono_error_cleanup (&error);
679 mono_thread_internal_unhandled_exception (exc);
680 } else if (res && *(MonoBoolean*) mono_object_unbox (res) == FALSE)
683 mono_thread_clr_state (thread, (MonoThreadState)~ThreadState_Background);
684 if (!mono_thread_test_state (thread , ThreadState_Background))
685 ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background);
687 mono_domain_set (mono_get_root_domain (), TRUE);
689 mono_thread_pop_appdomain_ref ();
691 mono_coop_mutex_lock (&threadpool->domains_lock);
693 tpdomain->domain->threadpool_jobs --;
694 g_assert (tpdomain->domain->threadpool_jobs >= 0);
696 if (tpdomain->domain->threadpool_jobs == 0 && mono_domain_is_unloading (tpdomain->domain)) {
697 ThreadPoolDomainCleanupSemaphore *cleanup_semaphore;
700 removed = domain_remove(tpdomain);
703 cleanup_semaphore = (ThreadPoolDomainCleanupSemaphore*) tpdomain->domain->cleanup_semaphore;
705 g_assert(cleanup_semaphore);
706 mono_coop_sem_post (&cleanup_semaphore->sem);
707 if (InterlockedDecrement (&cleanup_semaphore->ref) == 0) {
708 mono_coop_sem_destroy (&cleanup_semaphore->sem);
709 g_free (cleanup_semaphore);
710 tpdomain->domain->cleanup_semaphore = NULL;
713 domain_free (tpdomain);
717 previous_tpdomain = tpdomain;
720 mono_coop_mutex_unlock (&threadpool->domains_lock);
722 mono_coop_mutex_lock (&threadpool->active_threads_lock);
723 g_ptr_array_remove_fast (threadpool->working_threads, thread);
724 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
726 COUNTER_ATOMIC (counter, {
731 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_THREADPOOL, "[%p] worker finishing", mono_native_thread_id_get ());
735 worker_try_create (void)
737 ThreadPoolCounter counter;
738 MonoInternalThread *thread;
739 gint64 current_ticks;
742 mono_coop_mutex_lock (&threadpool->worker_creation_lock);
744 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try create worker", mono_native_thread_id_get ());
745 current_ticks = mono_100ns_ticks ();
746 now = current_ticks / (10 * 1000 * 1000);
747 if (0 == current_ticks) {
748 g_warning ("failed to get 100ns ticks");
750 if (threadpool->worker_creation_current_second != now) {
751 threadpool->worker_creation_current_second = now;
752 threadpool->worker_creation_current_count = 0;
754 g_assert (threadpool->worker_creation_current_count <= WORKER_CREATION_MAX_PER_SEC);
755 if (threadpool->worker_creation_current_count == WORKER_CREATION_MAX_PER_SEC) {
756 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try create worker, failed: maximum number of worker created per second reached, current count = %d",
757 mono_native_thread_id_get (), threadpool->worker_creation_current_count);
758 mono_coop_mutex_unlock (&threadpool->worker_creation_lock);
764 COUNTER_ATOMIC (counter, {
765 if (counter._.working >= counter._.max_working) {
766 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try create worker, failed: maximum number of working threads reached",
767 mono_native_thread_id_get ());
768 mono_coop_mutex_unlock (&threadpool->worker_creation_lock);
771 counter._.working ++;
776 if ((thread = mono_thread_create_internal (mono_get_root_domain (), worker_thread, NULL, TRUE, 0, &error)) != NULL) {
777 threadpool->worker_creation_current_count += 1;
779 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try create worker, created %p, now = %d count = %d", mono_native_thread_id_get (), thread->tid, now, threadpool->worker_creation_current_count);
780 mono_coop_mutex_unlock (&threadpool->worker_creation_lock);
784 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try create worker, failed: could not create thread due to %s", mono_native_thread_id_get (), mono_error_get_message (&error));
785 mono_error_cleanup (&error);
787 COUNTER_ATOMIC (counter, {
788 counter._.working --;
792 mono_coop_mutex_unlock (&threadpool->worker_creation_lock);
796 static void monitor_ensure_running (void);
799 worker_request (MonoDomain *domain)
801 ThreadPoolDomain *tpdomain;
804 g_assert (threadpool);
806 if (mono_runtime_is_shutting_down ())
809 mono_coop_mutex_lock (&threadpool->domains_lock);
811 /* synchronize check with worker_thread */
812 if (mono_domain_is_unloading (domain)) {
813 mono_coop_mutex_unlock (&threadpool->domains_lock);
817 tpdomain = domain_get (domain, TRUE);
819 tpdomain->outstanding_request ++;
821 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, domain = %p, outstanding_request = %d",
822 mono_native_thread_id_get (), tpdomain->domain, tpdomain->outstanding_request);
824 mono_coop_mutex_unlock (&threadpool->domains_lock);
826 if (threadpool->suspended)
829 monitor_ensure_running ();
831 if (worker_try_unpark ()) {
832 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, unparked", mono_native_thread_id_get ());
836 if (worker_try_create ()) {
837 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, created", mono_native_thread_id_get ());
841 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, failed", mono_native_thread_id_get ());
846 monitor_should_keep_running (void)
848 static gint64 last_should_keep_running = -1;
850 g_assert (monitor_status == MONITOR_STATUS_WAITING_FOR_REQUEST || monitor_status == MONITOR_STATUS_REQUESTED);
852 if (InterlockedExchange (&monitor_status, MONITOR_STATUS_WAITING_FOR_REQUEST) == MONITOR_STATUS_WAITING_FOR_REQUEST) {
853 gboolean should_keep_running = TRUE, force_should_keep_running = FALSE;
855 if (mono_runtime_is_shutting_down ()) {
856 should_keep_running = FALSE;
858 mono_coop_mutex_lock (&threadpool->domains_lock);
859 if (!domain_any_has_request ())
860 should_keep_running = FALSE;
861 mono_coop_mutex_unlock (&threadpool->domains_lock);
863 if (!should_keep_running) {
864 if (last_should_keep_running == -1 || mono_100ns_ticks () - last_should_keep_running < MONITOR_MINIMAL_LIFETIME * 1000 * 10) {
865 should_keep_running = force_should_keep_running = TRUE;
870 if (should_keep_running) {
871 if (last_should_keep_running == -1 || !force_should_keep_running)
872 last_should_keep_running = mono_100ns_ticks ();
874 last_should_keep_running = -1;
875 if (InterlockedCompareExchange (&monitor_status, MONITOR_STATUS_NOT_RUNNING, MONITOR_STATUS_WAITING_FOR_REQUEST) == MONITOR_STATUS_WAITING_FOR_REQUEST)
880 g_assert (monitor_status == MONITOR_STATUS_WAITING_FOR_REQUEST || monitor_status == MONITOR_STATUS_REQUESTED);
886 monitor_sufficient_delay_since_last_dequeue (void)
890 g_assert (threadpool);
892 if (threadpool->cpu_usage < CPU_USAGE_LOW) {
893 threshold = MONITOR_INTERVAL;
895 ThreadPoolCounter counter;
896 counter.as_gint64 = COUNTER_READ();
897 threshold = counter._.max_working * MONITOR_INTERVAL * 2;
900 return mono_msec_ticks () >= threadpool->heuristic_last_dequeue + threshold;
903 static void hill_climbing_force_change (gint16 new_thread_count, ThreadPoolHeuristicStateTransition transition);
906 monitor_thread (void)
908 MonoInternalThread *current_thread = mono_thread_internal_current ();
911 mono_cpu_usage (threadpool->cpu_usage_state);
913 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, started", mono_native_thread_id_get ());
916 ThreadPoolCounter counter;
917 gboolean limit_worker_max_reached;
918 gint32 interval_left = MONITOR_INTERVAL;
919 gint32 awake = 0; /* number of spurious awakes we tolerate before doing a round of rebalancing */
921 g_assert (monitor_status != MONITOR_STATUS_NOT_RUNNING);
923 mono_gc_set_skip_thread (TRUE);
927 gboolean alerted = FALSE;
929 if (mono_runtime_is_shutting_down ())
932 ts = mono_msec_ticks ();
933 if (mono_thread_info_sleep (interval_left, &alerted) == 0)
935 interval_left -= mono_msec_ticks () - ts;
937 mono_gc_set_skip_thread (FALSE);
938 if ((current_thread->state & (ThreadState_StopRequested | ThreadState_SuspendRequested)) != 0)
939 mono_thread_interruption_checkpoint ();
940 mono_gc_set_skip_thread (TRUE);
941 } while (interval_left > 0 && ++awake < 10);
943 mono_gc_set_skip_thread (FALSE);
945 if (threadpool->suspended)
948 if (mono_runtime_is_shutting_down ())
951 mono_coop_mutex_lock (&threadpool->domains_lock);
952 if (!domain_any_has_request ()) {
953 mono_coop_mutex_unlock (&threadpool->domains_lock);
956 mono_coop_mutex_unlock (&threadpool->domains_lock);
958 threadpool->cpu_usage = mono_cpu_usage (threadpool->cpu_usage_state);
960 if (!monitor_sufficient_delay_since_last_dequeue ())
963 limit_worker_max_reached = FALSE;
965 COUNTER_ATOMIC (counter, {
966 if (counter._.max_working >= threadpool->limit_worker_max) {
967 limit_worker_max_reached = TRUE;
970 counter._.max_working ++;
973 if (limit_worker_max_reached)
976 hill_climbing_force_change (counter._.max_working, TRANSITION_STARVATION);
978 for (i = 0; i < 5; ++i) {
979 if (mono_runtime_is_shutting_down ())
982 if (worker_try_unpark ()) {
983 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, unparked", mono_native_thread_id_get ());
987 if (worker_try_create ()) {
988 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, created", mono_native_thread_id_get ());
992 } while (monitor_should_keep_running ());
994 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, finished", mono_native_thread_id_get ());
998 monitor_ensure_running (void)
1002 switch (monitor_status) {
1003 case MONITOR_STATUS_REQUESTED:
1005 case MONITOR_STATUS_WAITING_FOR_REQUEST:
1006 InterlockedCompareExchange (&monitor_status, MONITOR_STATUS_REQUESTED, MONITOR_STATUS_WAITING_FOR_REQUEST);
1008 case MONITOR_STATUS_NOT_RUNNING:
1009 if (mono_runtime_is_shutting_down ())
1011 if (InterlockedCompareExchange (&monitor_status, MONITOR_STATUS_REQUESTED, MONITOR_STATUS_NOT_RUNNING) == MONITOR_STATUS_NOT_RUNNING) {
1012 if (!mono_thread_create_internal (mono_get_root_domain (), monitor_thread, NULL, TRUE, SMALL_STACK, &error)) {
1013 monitor_status = MONITOR_STATUS_NOT_RUNNING;
1014 mono_error_cleanup (&error);
1019 default: g_assert_not_reached ();
1025 hill_climbing_change_thread_count (gint16 new_thread_count, ThreadPoolHeuristicStateTransition transition)
1027 ThreadPoolHillClimbing *hc;
1029 g_assert (threadpool);
1031 hc = &threadpool->heuristic_hill_climbing;
1033 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_THREADPOOL, "[%p] hill climbing, change max number of threads %d", mono_native_thread_id_get (), new_thread_count);
1035 hc->last_thread_count = new_thread_count;
1036 hc->current_sample_interval = rand_next (&hc->random_interval_generator, hc->sample_interval_low, hc->sample_interval_high);
1037 hc->elapsed_since_last_change = 0;
1038 hc->completions_since_last_change = 0;
1042 hill_climbing_force_change (gint16 new_thread_count, ThreadPoolHeuristicStateTransition transition)
1044 ThreadPoolHillClimbing *hc;
1046 g_assert (threadpool);
1048 hc = &threadpool->heuristic_hill_climbing;
1050 if (new_thread_count != hc->last_thread_count) {
1051 hc->current_control_setting += new_thread_count - hc->last_thread_count;
1052 hill_climbing_change_thread_count (new_thread_count, transition);
1056 static double_complex
1057 hill_climbing_get_wave_component (gdouble *samples, guint sample_count, gdouble period)
1059 ThreadPoolHillClimbing *hc;
1060 gdouble w, cosine, sine, coeff, q0, q1, q2;
1063 g_assert (threadpool);
1064 g_assert (sample_count >= period);
1065 g_assert (period >= 2);
1067 hc = &threadpool->heuristic_hill_climbing;
1069 w = 2.0 * M_PI / period;
1072 coeff = 2.0 * cosine;
1075 for (i = 0; i < sample_count; ++i) {
1076 q0 = coeff * q1 - q2 + samples [(hc->total_samples - sample_count + i) % hc->samples_to_measure];
1081 return mono_double_complex_scalar_div (mono_double_complex_make (q1 - q2 * cosine, (q2 * sine)), ((gdouble)sample_count));
1085 hill_climbing_update (gint16 current_thread_count, guint32 sample_duration, gint32 completions, gint64 *adjustment_interval)
1087 ThreadPoolHillClimbing *hc;
1088 ThreadPoolHeuristicStateTransition transition;
1090 gdouble throughput_error_estimate;
1096 gint new_thread_wave_magnitude;
1097 gint new_thread_count;
1098 double_complex thread_wave_component;
1099 double_complex throughput_wave_component;
1100 double_complex ratio;
1102 g_assert (threadpool);
1103 g_assert (adjustment_interval);
1105 hc = &threadpool->heuristic_hill_climbing;
1107 /* If someone changed the thread count without telling us, update our records accordingly. */
1108 if (current_thread_count != hc->last_thread_count)
1109 hill_climbing_force_change (current_thread_count, TRANSITION_INITIALIZING);
1111 /* Update the cumulative stats for this thread count */
1112 hc->elapsed_since_last_change += sample_duration;
1113 hc->completions_since_last_change += completions;
1115 /* Add in any data we've already collected about this sample */
1116 sample_duration += hc->accumulated_sample_duration;
1117 completions += hc->accumulated_completion_count;
1119 /* We need to make sure we're collecting reasonably accurate data. Since we're just counting the end
1120 * of each work item, we are goinng to be missing some data about what really happened during the
1121 * sample interval. The count produced by each thread includes an initial work item that may have
1122 * started well before the start of the interval, and each thread may have been running some new
1123 * work item for some time before the end of the interval, which did not yet get counted. So
1124 * our count is going to be off by +/- threadCount workitems.
1126 * The exception is that the thread that reported to us last time definitely wasn't running any work
1127 * at that time, and the thread that's reporting now definitely isn't running a work item now. So
1128 * we really only need to consider threadCount-1 threads.
1130 * Thus the percent error in our count is +/- (threadCount-1)/numCompletions.
1132 * We cannot rely on the frequency-domain analysis we'll be doing later to filter out this error, because
1133 * of the way it accumulates over time. If this sample is off by, say, 33% in the negative direction,
1134 * then the next one likely will be too. The one after that will include the sum of the completions
1135 * we missed in the previous samples, and so will be 33% positive. So every three samples we'll have
1136 * two "low" samples and one "high" sample. This will appear as periodic variation right in the frequency
1137 * range we're targeting, which will not be filtered by the frequency-domain translation. */
1138 if (hc->total_samples > 0 && ((current_thread_count - 1.0) / completions) >= hc->max_sample_error) {
1139 /* Not accurate enough yet. Let's accumulate the data so
1140 * far, and tell the ThreadPool to collect a little more. */
1141 hc->accumulated_sample_duration = sample_duration;
1142 hc->accumulated_completion_count = completions;
1143 *adjustment_interval = 10;
1144 return current_thread_count;
1147 /* We've got enouugh data for our sample; reset our accumulators for next time. */
1148 hc->accumulated_sample_duration = 0;
1149 hc->accumulated_completion_count = 0;
1151 /* Add the current thread count and throughput sample to our history. */
1152 throughput = ((gdouble) completions) / sample_duration;
1154 sample_index = hc->total_samples % hc->samples_to_measure;
1155 hc->samples [sample_index] = throughput;
1156 hc->thread_counts [sample_index] = current_thread_count;
1157 hc->total_samples ++;
1159 /* Set up defaults for our metrics. */
1160 thread_wave_component = mono_double_complex_make(0, 0);
1161 throughput_wave_component = mono_double_complex_make(0, 0);
1162 throughput_error_estimate = 0;
1163 ratio = mono_double_complex_make(0, 0);
1166 transition = TRANSITION_WARMUP;
1168 /* How many samples will we use? It must be at least the three wave periods we're looking for, and it must also
1169 * be a whole multiple of the primary wave's period; otherwise the frequency we're looking for will fall between
1170 * two frequency bands in the Fourier analysis, and we won't be able to measure it accurately. */
1171 sample_count = ((gint) MIN (hc->total_samples - 1, hc->samples_to_measure) / hc->wave_period) * hc->wave_period;
1173 if (sample_count > hc->wave_period) {
1175 gdouble average_throughput;
1176 gdouble average_thread_count;
1177 gdouble sample_sum = 0;
1178 gdouble thread_sum = 0;
1180 /* Average the throughput and thread count samples, so we can scale the wave magnitudes later. */
1181 for (i = 0; i < sample_count; ++i) {
1182 guint j = (hc->total_samples - sample_count + i) % hc->samples_to_measure;
1183 sample_sum += hc->samples [j];
1184 thread_sum += hc->thread_counts [j];
1187 average_throughput = sample_sum / sample_count;
1188 average_thread_count = thread_sum / sample_count;
1190 if (average_throughput > 0 && average_thread_count > 0) {
1191 gdouble noise_for_confidence, adjacent_period_1, adjacent_period_2;
1193 /* Calculate the periods of the adjacent frequency bands we'll be using to
1194 * measure noise levels. We want the two adjacent Fourier frequency bands. */
1195 adjacent_period_1 = sample_count / (((gdouble) sample_count) / ((gdouble) hc->wave_period) + 1);
1196 adjacent_period_2 = sample_count / (((gdouble) sample_count) / ((gdouble) hc->wave_period) - 1);
1198 /* Get the the three different frequency components of the throughput (scaled by average
1199 * throughput). Our "error" estimate (the amount of noise that might be present in the
1200 * frequency band we're really interested in) is the average of the adjacent bands. */
1201 throughput_wave_component = mono_double_complex_scalar_div (hill_climbing_get_wave_component (hc->samples, sample_count, hc->wave_period), average_throughput);
1202 throughput_error_estimate = cabs (mono_double_complex_scalar_div (hill_climbing_get_wave_component (hc->samples, sample_count, adjacent_period_1), average_throughput));
1204 if (adjacent_period_2 <= sample_count) {
1205 throughput_error_estimate = MAX (throughput_error_estimate, cabs (mono_double_complex_scalar_div (hill_climbing_get_wave_component (
1206 hc->samples, sample_count, adjacent_period_2), average_throughput)));
1209 /* Do the same for the thread counts, so we have something to compare to. We don't
1210 * measure thread count noise, because there is none; these are exact measurements. */
1211 thread_wave_component = mono_double_complex_scalar_div (hill_climbing_get_wave_component (hc->thread_counts, sample_count, hc->wave_period), average_thread_count);
1213 /* Update our moving average of the throughput noise. We'll use this
1214 * later as feedback to determine the new size of the thread wave. */
1215 if (hc->average_throughput_noise == 0) {
1216 hc->average_throughput_noise = throughput_error_estimate;
1218 hc->average_throughput_noise = (hc->throughput_error_smoothing_factor * throughput_error_estimate)
1219 + ((1.0 + hc->throughput_error_smoothing_factor) * hc->average_throughput_noise);
1222 if (cabs (thread_wave_component) > 0) {
1223 /* Adjust the throughput wave so it's centered around the target wave,
1224 * and then calculate the adjusted throughput/thread ratio. */
1225 ratio = mono_double_complex_div (mono_double_complex_sub (throughput_wave_component, mono_double_complex_scalar_mul(thread_wave_component, hc->target_throughput_ratio)), thread_wave_component);
1226 transition = TRANSITION_CLIMBING_MOVE;
1228 ratio = mono_double_complex_make (0, 0);
1229 transition = TRANSITION_STABILIZING;
1232 noise_for_confidence = MAX (hc->average_throughput_noise, throughput_error_estimate);
1233 if (noise_for_confidence > 0) {
1234 confidence = cabs (thread_wave_component) / noise_for_confidence / hc->target_signal_to_noise_ratio;
1236 /* there is no noise! */
1242 /* We use just the real part of the complex ratio we just calculated. If the throughput signal
1243 * is exactly in phase with the thread signal, this will be the same as taking the magnitude of
1244 * the complex move and moving that far up. If they're 180 degrees out of phase, we'll move
1245 * backward (because this indicates that our changes are having the opposite of the intended effect).
1246 * If they're 90 degrees out of phase, we won't move at all, because we can't tell wether we're
1247 * having a negative or positive effect on throughput. */
1248 move = creal (ratio);
1249 move = CLAMP (move, -1.0, 1.0);
1251 /* Apply our confidence multiplier. */
1252 move *= CLAMP (confidence, -1.0, 1.0);
1254 /* Now apply non-linear gain, such that values around zero are attenuated, while higher values
1255 * are enhanced. This allows us to move quickly if we're far away from the target, but more slowly
1256 * if we're getting close, giving us rapid ramp-up without wild oscillations around the target. */
1257 gain = hc->max_change_per_second * sample_duration;
1258 move = pow (fabs (move), hc->gain_exponent) * (move >= 0.0 ? 1 : -1) * gain;
1259 move = MIN (move, hc->max_change_per_sample);
1261 /* If the result was positive, and CPU is > 95%, refuse the move. */
1262 if (move > 0.0 && threadpool->cpu_usage > CPU_USAGE_HIGH)
1265 /* Apply the move to our control setting. */
1266 hc->current_control_setting += move;
1268 /* Calculate the new thread wave magnitude, which is based on the moving average we've been keeping of the
1269 * throughput error. This average starts at zero, so we'll start with a nice safe little wave at first. */
1270 new_thread_wave_magnitude = (gint)(0.5 + (hc->current_control_setting * hc->average_throughput_noise
1271 * hc->target_signal_to_noise_ratio * hc->thread_magnitude_multiplier * 2.0));
1272 new_thread_wave_magnitude = CLAMP (new_thread_wave_magnitude, 1, hc->max_thread_wave_magnitude);
1274 /* Make sure our control setting is within the ThreadPool's limits. */
1275 hc->current_control_setting = CLAMP (hc->current_control_setting, threadpool->limit_worker_min, threadpool->limit_worker_max - new_thread_wave_magnitude);
1277 /* Calculate the new thread count (control setting + square wave). */
1278 new_thread_count = (gint)(hc->current_control_setting + new_thread_wave_magnitude * ((hc->total_samples / (hc->wave_period / 2)) % 2));
1280 /* Make sure the new thread count doesn't exceed the ThreadPool's limits. */
1281 new_thread_count = CLAMP (new_thread_count, threadpool->limit_worker_min, threadpool->limit_worker_max);
1283 if (new_thread_count != current_thread_count)
1284 hill_climbing_change_thread_count (new_thread_count, transition);
1286 if (creal (ratio) < 0.0 && new_thread_count == threadpool->limit_worker_min)
1287 *adjustment_interval = (gint)(0.5 + hc->current_sample_interval * (10.0 * MAX (-1.0 * creal (ratio), 1.0)));
1289 *adjustment_interval = hc->current_sample_interval;
1291 return new_thread_count;
1295 heuristic_notify_work_completed (void)
1297 g_assert (threadpool);
1299 InterlockedIncrement (&threadpool->heuristic_completions);
1300 threadpool->heuristic_last_dequeue = mono_msec_ticks ();
1304 heuristic_should_adjust (void)
1306 g_assert (threadpool);
1308 if (threadpool->heuristic_last_dequeue > threadpool->heuristic_last_adjustment + threadpool->heuristic_adjustment_interval) {
1309 ThreadPoolCounter counter;
1310 counter.as_gint64 = COUNTER_READ();
1311 if (counter._.working <= counter._.max_working)
1319 heuristic_adjust (void)
1321 g_assert (threadpool);
1323 if (mono_coop_mutex_trylock (&threadpool->heuristic_lock) == 0) {
1324 gint32 completions = InterlockedExchange (&threadpool->heuristic_completions, 0);
1325 gint64 sample_end = mono_msec_ticks ();
1326 gint64 sample_duration = sample_end - threadpool->heuristic_sample_start;
1328 if (sample_duration >= threadpool->heuristic_adjustment_interval / 2) {
1329 ThreadPoolCounter counter;
1330 gint16 new_thread_count;
1332 counter.as_gint64 = COUNTER_READ ();
1333 new_thread_count = hill_climbing_update (counter._.max_working, sample_duration, completions, &threadpool->heuristic_adjustment_interval);
1335 COUNTER_ATOMIC (counter, { counter._.max_working = new_thread_count; });
1337 if (new_thread_count > counter._.max_working)
1338 worker_request (mono_domain_get ());
1340 threadpool->heuristic_sample_start = sample_end;
1341 threadpool->heuristic_last_adjustment = mono_msec_ticks ();
1344 mono_coop_mutex_unlock (&threadpool->heuristic_lock);
1349 mono_threadpool_ms_cleanup (void)
1351 #ifndef DISABLE_SOCKETS
1352 mono_threadpool_ms_io_cleanup ();
1354 mono_lazy_cleanup (&status, cleanup);
1358 mono_threadpool_ms_begin_invoke (MonoDomain *domain, MonoObject *target, MonoMethod *method, gpointer *params, MonoError *error)
1360 static MonoClass *async_call_klass = NULL;
1361 MonoMethodMessage *message;
1362 MonoAsyncResult *async_result;
1363 MonoAsyncCall *async_call;
1364 MonoDelegate *async_callback = NULL;
1365 MonoObject *state = NULL;
1367 if (!async_call_klass)
1368 async_call_klass = mono_class_load_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
1370 mono_lazy_initialize (&status, initialize);
1372 mono_error_init (error);
1374 message = mono_method_call_message_new (method, params, mono_get_delegate_invoke (method->klass), (params != NULL) ? (&async_callback) : NULL, (params != NULL) ? (&state) : NULL, error);
1375 return_val_if_nok (error, NULL);
1377 async_call = (MonoAsyncCall*) mono_object_new_checked (domain, async_call_klass, error);
1378 return_val_if_nok (error, NULL);
1380 MONO_OBJECT_SETREF (async_call, msg, message);
1381 MONO_OBJECT_SETREF (async_call, state, state);
1383 if (async_callback) {
1384 MONO_OBJECT_SETREF (async_call, cb_method, mono_get_delegate_invoke (((MonoObject*) async_callback)->vtable->klass));
1385 MONO_OBJECT_SETREF (async_call, cb_target, async_callback);
1388 async_result = mono_async_result_new (domain, NULL, async_call->state, NULL, (MonoObject*) async_call, error);
1389 return_val_if_nok (error, NULL);
1390 MONO_OBJECT_SETREF (async_result, async_delegate, target);
1392 mono_threadpool_ms_enqueue_work_item (domain, (MonoObject*) async_result, error);
1393 return_val_if_nok (error, NULL);
1395 return async_result;
1399 mono_threadpool_ms_end_invoke (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc, MonoError *error)
1403 mono_error_init (error);
1405 g_assert (out_args);
1410 /* check if already finished */
1411 mono_monitor_enter ((MonoObject*) ares);
1413 if (ares->endinvoke_called) {
1414 mono_error_set_invalid_operation(error, "Delegate EndInvoke method called more than once");
1415 mono_monitor_exit ((MonoObject*) ares);
1419 ares->endinvoke_called = 1;
1421 /* wait until we are really finished */
1422 if (ares->completed) {
1423 mono_monitor_exit ((MonoObject *) ares);
1425 gpointer wait_event;
1427 wait_event = mono_wait_handle_get_handle ((MonoWaitHandle*) ares->handle);
1429 wait_event = CreateEvent (NULL, TRUE, FALSE, NULL);
1430 g_assert(wait_event);
1431 MonoWaitHandle *wait_handle = mono_wait_handle_new (mono_object_domain (ares), wait_event, error);
1432 if (!is_ok (error)) {
1433 CloseHandle (wait_event);
1436 MONO_OBJECT_SETREF (ares, handle, (MonoObject*) wait_handle);
1438 mono_monitor_exit ((MonoObject*) ares);
1440 WaitForSingleObjectEx (wait_event, INFINITE, TRUE);
1444 ac = (MonoAsyncCall*) ares->object_data;
1447 *exc = ac->msg->exc; /* FIXME: GC add write barrier */
1448 *out_args = ac->out_args;
1453 mono_threadpool_ms_remove_domain_jobs (MonoDomain *domain, int timeout)
1457 ThreadPoolDomain *tpdomain;
1458 ThreadPoolDomainCleanupSemaphore *cleanup_semaphore;
1461 g_assert (timeout >= -1);
1463 g_assert (mono_domain_is_unloading (domain));
1466 end = mono_msec_ticks () + timeout;
1468 #ifndef DISABLE_SOCKETS
1469 mono_threadpool_ms_io_remove_domain_jobs (domain);
1470 if (timeout != -1) {
1471 if (mono_msec_ticks () > end)
1477 * There might be some threads out that could be about to execute stuff from the given domain.
1478 * We avoid that by waiting on a semaphore to be pulsed by the thread that reaches zero.
1479 * The semaphore is only created for domains which queued threadpool jobs.
1480 * We always wait on the semaphore rather than ensuring domain->threadpool_jobs is 0.
1481 * There may be pending outstanding requests which will create new jobs.
1482 * The semaphore is signaled the threadpool domain has been removed from list
1483 * and we know no more jobs for the domain will be processed.
1486 mono_lazy_initialize(&status, initialize);
1487 mono_coop_mutex_lock(&threadpool->domains_lock);
1489 tpdomain = domain_get (domain, FALSE);
1490 if (!tpdomain || tpdomain->outstanding_request == 0) {
1491 mono_coop_mutex_unlock(&threadpool->domains_lock);
1495 mono_coop_mutex_unlock(&threadpool->domains_lock);
1497 g_assert (domain->cleanup_semaphore);
1499 cleanup_semaphore = (ThreadPoolDomainCleanupSemaphore*) domain->cleanup_semaphore;
1501 if (timeout == -1) {
1502 res = mono_coop_sem_wait (&cleanup_semaphore->sem, MONO_SEM_FLAGS_NONE);
1503 g_assert (res == MONO_SEM_TIMEDWAIT_RET_SUCCESS);
1505 now = mono_msec_ticks();
1508 res = mono_coop_sem_timedwait (&cleanup_semaphore->sem, end - now, MONO_SEM_FLAGS_NONE);
1511 if (InterlockedDecrement (&cleanup_semaphore->ref) == 0) {
1512 mono_coop_sem_destroy (&cleanup_semaphore->sem);
1513 g_free (cleanup_semaphore);
1514 domain->cleanup_semaphore = NULL;
1517 return res == MONO_SEM_TIMEDWAIT_RET_SUCCESS;
1521 mono_threadpool_ms_suspend (void)
1524 threadpool->suspended = TRUE;
1528 mono_threadpool_ms_resume (void)
1531 threadpool->suspended = FALSE;
1535 ves_icall_System_Threading_ThreadPool_GetAvailableThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
1537 ThreadPoolCounter counter;
1539 if (!worker_threads || !completion_port_threads)
1542 mono_lazy_initialize (&status, initialize);
1544 counter.as_gint64 = COUNTER_READ ();
1546 *worker_threads = MAX (0, threadpool->limit_worker_max - counter._.active);
1547 *completion_port_threads = threadpool->limit_io_max;
1551 ves_icall_System_Threading_ThreadPool_GetMinThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
1553 if (!worker_threads || !completion_port_threads)
1556 mono_lazy_initialize (&status, initialize);
1558 *worker_threads = threadpool->limit_worker_min;
1559 *completion_port_threads = threadpool->limit_io_min;
1563 ves_icall_System_Threading_ThreadPool_GetMaxThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
1565 if (!worker_threads || !completion_port_threads)
1568 mono_lazy_initialize (&status, initialize);
1570 *worker_threads = threadpool->limit_worker_max;
1571 *completion_port_threads = threadpool->limit_io_max;
1575 ves_icall_System_Threading_ThreadPool_SetMinThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
1577 mono_lazy_initialize (&status, initialize);
1579 if (worker_threads <= 0 || worker_threads > threadpool->limit_worker_max)
1581 if (completion_port_threads <= 0 || completion_port_threads > threadpool->limit_io_max)
1584 threadpool->limit_worker_min = worker_threads;
1585 threadpool->limit_io_min = completion_port_threads;
1591 ves_icall_System_Threading_ThreadPool_SetMaxThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
1593 gint cpu_count = mono_cpu_count ();
1595 mono_lazy_initialize (&status, initialize);
1597 if (worker_threads < threadpool->limit_worker_min || worker_threads < cpu_count)
1599 if (completion_port_threads < threadpool->limit_io_min || completion_port_threads < cpu_count)
1602 threadpool->limit_worker_max = worker_threads;
1603 threadpool->limit_io_max = completion_port_threads;
1609 ves_icall_System_Threading_ThreadPool_InitializeVMTp (MonoBoolean *enable_worker_tracking)
1611 if (enable_worker_tracking) {
1612 // TODO implement some kind of switch to have the possibily to use it
1613 *enable_worker_tracking = FALSE;
1616 mono_lazy_initialize (&status, initialize);
1620 ves_icall_System_Threading_ThreadPool_NotifyWorkItemComplete (void)
1622 ThreadPoolCounter counter;
1624 if (mono_domain_is_unloading (mono_domain_get ()) || mono_runtime_is_shutting_down ())
1627 heuristic_notify_work_completed ();
1629 if (heuristic_should_adjust ())
1630 heuristic_adjust ();
1632 counter.as_gint64 = COUNTER_READ ();
1633 return counter._.working <= counter._.max_working;
1637 ves_icall_System_Threading_ThreadPool_NotifyWorkItemProgressNative (void)
1639 heuristic_notify_work_completed ();
1641 if (heuristic_should_adjust ())
1642 heuristic_adjust ();
1646 ves_icall_System_Threading_ThreadPool_ReportThreadStatus (MonoBoolean is_working)
1650 mono_error_set_not_implemented (&error, "");
1651 mono_error_set_pending_exception (&error);
1655 ves_icall_System_Threading_ThreadPool_RequestWorkerThread (void)
1657 return worker_request (mono_domain_get ());
1660 MonoBoolean G_GNUC_UNUSED
1661 ves_icall_System_Threading_ThreadPool_PostQueuedCompletionStatus (MonoNativeOverlapped *native_overlapped)
1663 /* This copy the behavior of the current Mono implementation */
1665 mono_error_set_not_implemented (&error, "");
1666 mono_error_set_pending_exception (&error);
1670 MonoBoolean G_GNUC_UNUSED
1671 ves_icall_System_Threading_ThreadPool_BindIOCompletionCallbackNative (gpointer file_handle)
1673 /* This copy the behavior of the current Mono implementation */
1677 MonoBoolean G_GNUC_UNUSED
1678 ves_icall_System_Threading_ThreadPool_IsThreadPoolHosted (void)