2 * threadpool-ms.c: Microsoft threadpool runtime support
5 * Ludovic Henry (ludovic.henry@xamarin.com)
7 * Copyright 2015 Xamarin, Inc (http://www.xamarin.com)
11 // Copyright (c) Microsoft. All rights reserved.
12 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
15 // - src/vm/comthreadpool.cpp
16 // - src/vm/win32threadpoolcpp
17 // - src/vm/threadpoolrequest.cpp
18 // - src/vm/hillclimbing.cpp
20 // Ported from C++ to C and adjusted to Mono runtime
23 #define _USE_MATH_DEFINES // needed by MSVC to define math constants
28 #include <mono/metadata/class-internals.h>
29 #include <mono/metadata/exception.h>
30 #include <mono/metadata/gc-internals.h>
31 #include <mono/metadata/object.h>
32 #include <mono/metadata/object-internals.h>
33 #include <mono/metadata/threadpool-ms.h>
34 #include <mono/metadata/threadpool-ms-io.h>
35 #include <mono/utils/atomic.h>
36 #include <mono/utils/mono-compiler.h>
37 #include <mono/utils/mono-complex.h>
38 #include <mono/utils/mono-lazy-init.h>
39 #include <mono/utils/mono-logger.h>
40 #include <mono/utils/mono-logger-internals.h>
41 #include <mono/utils/mono-proclib.h>
42 #include <mono/utils/mono-threads.h>
43 #include <mono/utils/mono-time.h>
44 #include <mono/utils/mono-rand.h>
46 #define CPU_USAGE_LOW 80
47 #define CPU_USAGE_HIGH 95
49 #define MONITOR_INTERVAL 500 // ms
50 #define MONITOR_MINIMAL_LIFETIME 60 * 1000 // ms
52 #define WORKER_CREATION_MAX_PER_SEC 10
54 /* The exponent to apply to the gain. 1.0 means to use linear gain,
55 * higher values will enhance large moves and damp small ones.
57 #define HILL_CLIMBING_GAIN_EXPONENT 2.0
59 /* The 'cost' of a thread. 0 means drive for increased throughput regardless
60 * of thread count, higher values bias more against higher thread counts.
62 #define HILL_CLIMBING_BIAS 0.15
64 #define HILL_CLIMBING_WAVE_PERIOD 4
65 #define HILL_CLIMBING_MAX_WAVE_MAGNITUDE 20
66 #define HILL_CLIMBING_WAVE_MAGNITUDE_MULTIPLIER 1.0
67 #define HILL_CLIMBING_WAVE_HISTORY_SIZE 8
68 #define HILL_CLIMBING_TARGET_SIGNAL_TO_NOISE_RATIO 3.0
69 #define HILL_CLIMBING_MAX_CHANGE_PER_SECOND 4
70 #define HILL_CLIMBING_MAX_CHANGE_PER_SAMPLE 20
71 #define HILL_CLIMBING_SAMPLE_INTERVAL_LOW 10
72 #define HILL_CLIMBING_SAMPLE_INTERVAL_HIGH 200
73 #define HILL_CLIMBING_ERROR_SMOOTHING_FACTOR 0.01
74 #define HILL_CLIMBING_MAX_SAMPLE_ERROR_PERCENT 0.15
78 gint16 max_working; /* determined by heuristic */
79 gint16 active; /* executing worker_thread */
80 gint16 working; /* actively executing worker_thread, not parked */
81 gint16 parked; /* parked */
88 gint32 outstanding_request;
91 typedef MonoInternalThread ThreadPoolWorkingThread;
95 gint32 samples_to_measure;
96 gdouble target_throughput_ratio;
97 gdouble target_signal_to_noise_ratio;
98 gdouble max_change_per_second;
99 gdouble max_change_per_sample;
100 gint32 max_thread_wave_magnitude;
101 gint32 sample_interval_low;
102 gdouble thread_magnitude_multiplier;
103 gint32 sample_interval_high;
104 gdouble throughput_error_smoothing_factor;
105 gdouble gain_exponent;
106 gdouble max_sample_error;
108 gdouble current_control_setting;
109 gint64 total_samples;
110 gint16 last_thread_count;
111 gdouble elapsed_since_last_change;
112 gdouble completions_since_last_change;
114 gdouble average_throughput_noise;
117 gdouble *thread_counts;
119 guint32 current_sample_interval;
120 gpointer random_interval_generator;
122 gint32 accumulated_completion_count;
123 gdouble accumulated_sample_duration;
124 } ThreadPoolHillClimbing;
127 ThreadPoolCounter counters;
129 GPtrArray *domains; // ThreadPoolDomain* []
130 MonoCoopMutex domains_lock;
132 GPtrArray *working_threads; // ThreadPoolWorkingThread* []
133 gint32 parked_threads_count;
134 MonoCoopCond parked_threads_cond;
135 MonoCoopMutex active_threads_lock; /* protect access to working_threads and parked_threads */
137 guint32 worker_creation_current_second;
138 guint32 worker_creation_current_count;
139 MonoCoopMutex worker_creation_lock;
141 gint32 heuristic_completions;
142 guint32 heuristic_sample_start;
143 guint32 heuristic_last_dequeue; // ms
144 guint32 heuristic_last_adjustment; // ms
145 guint32 heuristic_adjustment_interval; // ms
146 ThreadPoolHillClimbing heuristic_hill_climbing;
147 MonoCoopMutex heuristic_lock;
149 gint32 limit_worker_min;
150 gint32 limit_worker_max;
154 MonoCpuUsageState *cpu_usage_state;
157 /* suspended by the debugger */
163 TRANSITION_INITIALIZING,
164 TRANSITION_RANDOM_MOVE,
165 TRANSITION_CLIMBING_MOVE,
166 TRANSITION_CHANGE_POINT,
167 TRANSITION_STABILIZING,
168 TRANSITION_STARVATION,
169 TRANSITION_THREAD_TIMED_OUT,
170 TRANSITION_UNDEFINED,
171 } ThreadPoolHeuristicStateTransition;
173 static mono_lazy_init_t status = MONO_LAZY_INIT_STATUS_NOT_INITIALIZED;
176 MONITOR_STATUS_REQUESTED,
177 MONITOR_STATUS_WAITING_FOR_REQUEST,
178 MONITOR_STATUS_NOT_RUNNING,
181 static gint32 monitor_status = MONITOR_STATUS_NOT_RUNNING;
183 static ThreadPool* threadpool;
185 #define COUNTER_CHECK(counter) \
187 g_assert (counter._.max_working > 0); \
188 g_assert (counter._.working >= 0); \
189 g_assert (counter._.active >= 0); \
192 #define COUNTER_READ() (InterlockedRead64 (&threadpool->counters.as_gint64))
194 #define COUNTER_ATOMIC(var,block) \
196 ThreadPoolCounter __old; \
198 g_assert (threadpool); \
199 __old.as_gint64 = COUNTER_READ (); \
202 COUNTER_CHECK (var); \
203 } while (InterlockedCompareExchange64 (&threadpool->counters.as_gint64, (var).as_gint64, __old.as_gint64) != __old.as_gint64); \
206 #define COUNTER_TRY_ATOMIC(res,var,block) \
208 ThreadPoolCounter __old; \
210 g_assert (threadpool); \
211 __old.as_gint64 = COUNTER_READ (); \
215 COUNTER_CHECK (var); \
216 (res) = InterlockedCompareExchange64 (&threadpool->counters.as_gint64, (var).as_gint64, __old.as_gint64) == __old.as_gint64; \
224 return mono_rand_init (NULL, 0);
228 rand_next (gpointer *handle, guint32 min, guint32 max)
232 mono_rand_try_get_uint32 (handle, &val, min, max, &error);
233 // FIXME handle error
234 mono_error_assert_ok (&error);
239 rand_free (gpointer handle)
241 mono_rand_close (handle);
247 ThreadPoolHillClimbing *hc;
248 const char *threads_per_cpu_env;
249 gint threads_per_cpu;
252 g_assert (!threadpool);
253 threadpool = g_new0 (ThreadPool, 1);
254 g_assert (threadpool);
256 threadpool->domains = g_ptr_array_new ();
257 mono_coop_mutex_init (&threadpool->domains_lock);
259 threadpool->parked_threads_count = 0;
260 mono_coop_cond_init (&threadpool->parked_threads_cond);
261 threadpool->working_threads = g_ptr_array_new ();
262 mono_coop_mutex_init (&threadpool->active_threads_lock);
264 threadpool->worker_creation_current_second = -1;
265 mono_coop_mutex_init (&threadpool->worker_creation_lock);
267 threadpool->heuristic_adjustment_interval = 10;
268 mono_coop_mutex_init (&threadpool->heuristic_lock);
272 hc = &threadpool->heuristic_hill_climbing;
274 hc->wave_period = HILL_CLIMBING_WAVE_PERIOD;
275 hc->max_thread_wave_magnitude = HILL_CLIMBING_MAX_WAVE_MAGNITUDE;
276 hc->thread_magnitude_multiplier = (gdouble) HILL_CLIMBING_WAVE_MAGNITUDE_MULTIPLIER;
277 hc->samples_to_measure = hc->wave_period * HILL_CLIMBING_WAVE_HISTORY_SIZE;
278 hc->target_throughput_ratio = (gdouble) HILL_CLIMBING_BIAS;
279 hc->target_signal_to_noise_ratio = (gdouble) HILL_CLIMBING_TARGET_SIGNAL_TO_NOISE_RATIO;
280 hc->max_change_per_second = (gdouble) HILL_CLIMBING_MAX_CHANGE_PER_SECOND;
281 hc->max_change_per_sample = (gdouble) HILL_CLIMBING_MAX_CHANGE_PER_SAMPLE;
282 hc->sample_interval_low = HILL_CLIMBING_SAMPLE_INTERVAL_LOW;
283 hc->sample_interval_high = HILL_CLIMBING_SAMPLE_INTERVAL_HIGH;
284 hc->throughput_error_smoothing_factor = (gdouble) HILL_CLIMBING_ERROR_SMOOTHING_FACTOR;
285 hc->gain_exponent = (gdouble) HILL_CLIMBING_GAIN_EXPONENT;
286 hc->max_sample_error = (gdouble) HILL_CLIMBING_MAX_SAMPLE_ERROR_PERCENT;
287 hc->current_control_setting = 0;
288 hc->total_samples = 0;
289 hc->last_thread_count = 0;
290 hc->average_throughput_noise = 0;
291 hc->elapsed_since_last_change = 0;
292 hc->accumulated_completion_count = 0;
293 hc->accumulated_sample_duration = 0;
294 hc->samples = g_new0 (gdouble, hc->samples_to_measure);
295 hc->thread_counts = g_new0 (gdouble, hc->samples_to_measure);
296 hc->random_interval_generator = rand_create ();
297 hc->current_sample_interval = rand_next (&hc->random_interval_generator, hc->sample_interval_low, hc->sample_interval_high);
299 if (!(threads_per_cpu_env = g_getenv ("MONO_THREADS_PER_CPU")))
302 threads_per_cpu = CLAMP (atoi (threads_per_cpu_env), 1, 50);
304 threads_count = mono_cpu_count () * threads_per_cpu;
306 threadpool->limit_worker_min = threadpool->limit_io_min = threads_count;
308 #if defined (PLATFORM_ANDROID) || defined (HOST_IOS)
309 threadpool->limit_worker_max = threadpool->limit_io_max = CLAMP (threads_count * 100, MIN (threads_count, 200), MAX (threads_count, 200));
311 threadpool->limit_worker_max = threadpool->limit_io_max = threads_count * 100;
314 threadpool->counters._.max_working = threadpool->limit_worker_min;
316 threadpool->cpu_usage_state = g_new0 (MonoCpuUsageState, 1);
318 threadpool->suspended = FALSE;
321 static void worker_kill (ThreadPoolWorkingThread *thread);
328 /* we make the assumption along the code that we are
329 * cleaning up only if the runtime is shutting down */
330 g_assert (mono_runtime_is_shutting_down ());
332 while (monitor_status != MONITOR_STATUS_NOT_RUNNING)
333 mono_thread_info_sleep (1, NULL);
335 mono_coop_mutex_lock (&threadpool->active_threads_lock);
337 /* stop all threadpool->working_threads */
338 for (i = 0; i < threadpool->working_threads->len; ++i)
339 worker_kill ((ThreadPoolWorkingThread*) g_ptr_array_index (threadpool->working_threads, i));
341 /* unpark all threadpool->parked_threads */
342 mono_coop_cond_broadcast (&threadpool->parked_threads_cond);
344 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
348 mono_threadpool_ms_enqueue_work_item (MonoDomain *domain, MonoObject *work_item, MonoError *error)
350 static MonoClass *threadpool_class = NULL;
351 static MonoMethod *unsafe_queue_custom_work_item_method = NULL;
352 MonoDomain *current_domain;
356 mono_error_init (error);
357 g_assert (work_item);
359 if (!threadpool_class)
360 threadpool_class = mono_class_load_from_name (mono_defaults.corlib, "System.Threading", "ThreadPool");
362 if (!unsafe_queue_custom_work_item_method)
363 unsafe_queue_custom_work_item_method = mono_class_get_method_from_name (threadpool_class, "UnsafeQueueCustomWorkItem", 2);
364 g_assert (unsafe_queue_custom_work_item_method);
368 args [0] = (gpointer) work_item;
369 args [1] = (gpointer) &f;
371 current_domain = mono_domain_get ();
372 if (current_domain == domain) {
373 mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
374 return_val_if_nok (error, FALSE);
376 mono_thread_push_appdomain_ref (domain);
377 if (mono_domain_set (domain, FALSE)) {
378 mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
379 if (!is_ok (error)) {
380 mono_thread_pop_appdomain_ref ();
383 mono_domain_set (current_domain, TRUE);
385 mono_thread_pop_appdomain_ref ();
390 /* LOCKING: threadpool->domains_lock must be held */
392 domain_add (ThreadPoolDomain *tpdomain)
398 len = threadpool->domains->len;
399 for (i = 0; i < len; ++i) {
400 if (g_ptr_array_index (threadpool->domains, i) == tpdomain)
405 g_ptr_array_add (threadpool->domains, tpdomain);
408 /* LOCKING: threadpool->domains_lock must be held */
410 domain_remove (ThreadPoolDomain *tpdomain)
413 return g_ptr_array_remove (threadpool->domains, tpdomain);
416 /* LOCKING: threadpool->domains_lock must be held */
417 static ThreadPoolDomain *
418 domain_get (MonoDomain *domain, gboolean create)
420 ThreadPoolDomain *tpdomain = NULL;
425 for (i = 0; i < threadpool->domains->len; ++i) {
426 tpdomain = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i);
427 if (tpdomain->domain == domain)
432 tpdomain = g_new0 (ThreadPoolDomain, 1);
433 tpdomain->domain = domain;
434 domain_add (tpdomain);
441 domain_free (ThreadPoolDomain *tpdomain)
446 /* LOCKING: threadpool->domains_lock must be held */
448 domain_any_has_request (void)
452 for (i = 0; i < threadpool->domains->len; ++i) {
453 ThreadPoolDomain *tmp = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i);
454 if (tmp->outstanding_request > 0)
461 /* LOCKING: threadpool->domains_lock must be held */
462 static ThreadPoolDomain *
463 domain_get_next (ThreadPoolDomain *current)
465 ThreadPoolDomain *tpdomain = NULL;
468 len = threadpool->domains->len;
470 guint i, current_idx = -1;
472 for (i = 0; i < len; ++i) {
473 if (current == g_ptr_array_index (threadpool->domains, i)) {
478 g_assert (current_idx >= 0);
480 for (i = current_idx + 1; i < len + current_idx + 1; ++i) {
481 ThreadPoolDomain *tmp = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i % len);
482 if (tmp->outstanding_request > 0) {
493 worker_wait_interrupt (gpointer data)
495 mono_coop_mutex_lock (&threadpool->active_threads_lock);
496 mono_coop_cond_signal (&threadpool->parked_threads_cond);
497 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
500 /* return TRUE if timeout, FALSE otherwise (worker unpark or interrupt) */
504 gboolean timeout = FALSE;
506 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] current worker parking", mono_native_thread_id_get ());
508 mono_gc_set_skip_thread (TRUE);
510 mono_coop_mutex_lock (&threadpool->active_threads_lock);
512 if (!mono_runtime_is_shutting_down ()) {
513 static gpointer rand_handle = NULL;
514 MonoInternalThread *thread_internal;
515 gboolean interrupted = FALSE;
518 rand_handle = rand_create ();
519 g_assert (rand_handle);
521 thread_internal = mono_thread_internal_current ();
522 g_assert (thread_internal);
524 threadpool->parked_threads_count += 1;
525 g_ptr_array_remove_fast (threadpool->working_threads, thread_internal);
527 mono_thread_info_install_interrupt (worker_wait_interrupt, NULL, &interrupted);
531 if (mono_coop_cond_timedwait (&threadpool->parked_threads_cond, &threadpool->active_threads_lock, rand_next ((void **)rand_handle, 5 * 1000, 60 * 1000)) != 0)
534 mono_thread_info_uninstall_interrupt (&interrupted);
537 g_ptr_array_add (threadpool->working_threads, thread_internal);
538 threadpool->parked_threads_count -= 1;
541 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
543 mono_gc_set_skip_thread (FALSE);
545 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] current worker unparking, timeout? %s", mono_native_thread_id_get (), timeout ? "yes" : "no");
551 worker_try_unpark (void)
553 gboolean res = FALSE;
555 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try unpark worker", mono_native_thread_id_get ());
557 mono_coop_mutex_lock (&threadpool->active_threads_lock);
558 if (threadpool->parked_threads_count > 0) {
559 mono_coop_cond_signal (&threadpool->parked_threads_cond);
562 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
564 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try unpark worker, success? %s", mono_native_thread_id_get (), res ? "yes" : "no");
570 worker_kill (ThreadPoolWorkingThread *thread)
572 if (thread == mono_thread_internal_current ())
575 mono_thread_internal_stop ((MonoInternalThread*) thread);
579 worker_thread (gpointer data)
582 MonoInternalThread *thread;
583 ThreadPoolDomain *tpdomain, *previous_tpdomain;
584 ThreadPoolCounter counter;
585 gboolean retire = FALSE;
587 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_THREADPOOL, "[%p] worker starting", mono_native_thread_id_get ());
589 g_assert (threadpool);
591 thread = mono_thread_internal_current ();
594 mono_thread_set_name_internal (thread, mono_string_new (mono_domain_get (), "Threadpool worker"), FALSE);
596 mono_coop_mutex_lock (&threadpool->active_threads_lock);
597 g_ptr_array_add (threadpool->working_threads, thread);
598 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
600 previous_tpdomain = NULL;
602 mono_coop_mutex_lock (&threadpool->domains_lock);
604 while (!mono_runtime_is_shutting_down ()) {
607 if ((thread->state & (ThreadState_StopRequested | ThreadState_SuspendRequested)) != 0) {
608 mono_coop_mutex_unlock (&threadpool->domains_lock);
609 mono_thread_interruption_checkpoint ();
610 mono_coop_mutex_lock (&threadpool->domains_lock);
613 if (retire || !(tpdomain = domain_get_next (previous_tpdomain))) {
616 COUNTER_ATOMIC (counter, {
617 counter._.working --;
621 mono_coop_mutex_unlock (&threadpool->domains_lock);
622 timeout = worker_park ();
623 mono_coop_mutex_lock (&threadpool->domains_lock);
625 COUNTER_ATOMIC (counter, {
626 counter._.working ++;
639 tpdomain->outstanding_request --;
640 g_assert (tpdomain->outstanding_request >= 0);
642 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] worker running in domain %p",
643 mono_native_thread_id_get (), tpdomain->domain, tpdomain->outstanding_request);
645 g_assert (tpdomain->domain);
646 g_assert (tpdomain->domain->threadpool_jobs >= 0);
647 tpdomain->domain->threadpool_jobs ++;
649 mono_coop_mutex_unlock (&threadpool->domains_lock);
651 mono_thread_push_appdomain_ref (tpdomain->domain);
652 if (mono_domain_set (tpdomain->domain, FALSE)) {
653 MonoObject *exc = NULL, *res;
655 res = mono_runtime_try_invoke (mono_defaults.threadpool_perform_wait_callback_method, NULL, NULL, &exc, &error);
656 if (exc || !mono_error_ok(&error)) {
658 exc = (MonoObject *) mono_error_convert_to_exception (&error);
660 mono_error_cleanup (&error);
661 mono_thread_internal_unhandled_exception (exc);
662 } else if (res && *(MonoBoolean*) mono_object_unbox (res) == FALSE)
665 mono_thread_clr_state (thread, (MonoThreadState)~ThreadState_Background);
666 if (!mono_thread_test_state (thread , ThreadState_Background))
667 ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background);
669 mono_domain_set (mono_get_root_domain (), TRUE);
671 mono_thread_pop_appdomain_ref ();
673 mono_coop_mutex_lock (&threadpool->domains_lock);
675 tpdomain->domain->threadpool_jobs --;
676 g_assert (tpdomain->domain->threadpool_jobs >= 0);
678 if (tpdomain->domain->threadpool_jobs == 0 && mono_domain_is_unloading (tpdomain->domain)) {
679 gboolean removed = domain_remove (tpdomain);
681 if (tpdomain->domain->cleanup_semaphore)
682 ReleaseSemaphore (tpdomain->domain->cleanup_semaphore, 1, NULL);
683 domain_free (tpdomain);
687 previous_tpdomain = tpdomain;
690 mono_coop_mutex_unlock (&threadpool->domains_lock);
692 mono_coop_mutex_lock (&threadpool->active_threads_lock);
693 g_ptr_array_remove_fast (threadpool->working_threads, thread);
694 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
696 COUNTER_ATOMIC (counter, {
701 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_THREADPOOL, "[%p] worker finishing", mono_native_thread_id_get ());
705 worker_try_create (void)
707 ThreadPoolCounter counter;
708 MonoInternalThread *thread;
711 mono_coop_mutex_lock (&threadpool->worker_creation_lock);
713 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try create worker", mono_native_thread_id_get ());
715 if ((now = mono_100ns_ticks () / 10 / 1000 / 1000) == 0) {
716 g_warning ("failed to get 100ns ticks");
718 if (threadpool->worker_creation_current_second != now) {
719 threadpool->worker_creation_current_second = now;
720 threadpool->worker_creation_current_count = 0;
722 g_assert (threadpool->worker_creation_current_count <= WORKER_CREATION_MAX_PER_SEC);
723 if (threadpool->worker_creation_current_count == WORKER_CREATION_MAX_PER_SEC) {
724 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",
725 mono_native_thread_id_get (), threadpool->worker_creation_current_count);
726 mono_coop_mutex_unlock (&threadpool->worker_creation_lock);
732 COUNTER_ATOMIC (counter, {
733 if (counter._.working >= counter._.max_working) {
734 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try create worker, failed: maximum number of working threads reached",
735 mono_native_thread_id_get ());
736 mono_coop_mutex_unlock (&threadpool->worker_creation_lock);
739 counter._.working ++;
743 if ((thread = mono_thread_create_internal (mono_get_root_domain (), worker_thread, NULL, TRUE, 0)) != NULL) {
744 threadpool->worker_creation_current_count += 1;
746 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);
747 mono_coop_mutex_unlock (&threadpool->worker_creation_lock);
751 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try create worker, failed: could not create thread", mono_native_thread_id_get ());
753 COUNTER_ATOMIC (counter, {
754 counter._.working --;
758 mono_coop_mutex_unlock (&threadpool->worker_creation_lock);
762 static void monitor_ensure_running (void);
765 worker_request (MonoDomain *domain)
767 ThreadPoolDomain *tpdomain;
770 g_assert (threadpool);
772 if (mono_runtime_is_shutting_down ())
775 mono_coop_mutex_lock (&threadpool->domains_lock);
777 /* synchronize check with worker_thread */
778 if (mono_domain_is_unloading (domain)) {
779 mono_coop_mutex_unlock (&threadpool->domains_lock);
783 tpdomain = domain_get (domain, TRUE);
785 tpdomain->outstanding_request ++;
787 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, domain = %p, outstanding_request = %d",
788 mono_native_thread_id_get (), tpdomain->domain, tpdomain->outstanding_request);
790 mono_coop_mutex_unlock (&threadpool->domains_lock);
792 if (threadpool->suspended)
795 monitor_ensure_running ();
797 if (worker_try_unpark ()) {
798 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, unparked", mono_native_thread_id_get ());
802 if (worker_try_create ()) {
803 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, created", mono_native_thread_id_get ());
807 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, failed", mono_native_thread_id_get ());
812 monitor_should_keep_running (void)
814 static gint64 last_should_keep_running = -1;
816 g_assert (monitor_status == MONITOR_STATUS_WAITING_FOR_REQUEST || monitor_status == MONITOR_STATUS_REQUESTED);
818 if (InterlockedExchange (&monitor_status, MONITOR_STATUS_WAITING_FOR_REQUEST) == MONITOR_STATUS_WAITING_FOR_REQUEST) {
819 gboolean should_keep_running = TRUE, force_should_keep_running = FALSE;
821 if (mono_runtime_is_shutting_down ()) {
822 should_keep_running = FALSE;
824 mono_coop_mutex_lock (&threadpool->domains_lock);
825 if (!domain_any_has_request ())
826 should_keep_running = FALSE;
827 mono_coop_mutex_unlock (&threadpool->domains_lock);
829 if (!should_keep_running) {
830 if (last_should_keep_running == -1 || mono_100ns_ticks () - last_should_keep_running < MONITOR_MINIMAL_LIFETIME * 1000 * 10) {
831 should_keep_running = force_should_keep_running = TRUE;
836 if (should_keep_running) {
837 if (last_should_keep_running == -1 || !force_should_keep_running)
838 last_should_keep_running = mono_100ns_ticks ();
840 last_should_keep_running = -1;
841 if (InterlockedCompareExchange (&monitor_status, MONITOR_STATUS_NOT_RUNNING, MONITOR_STATUS_WAITING_FOR_REQUEST) == MONITOR_STATUS_WAITING_FOR_REQUEST)
846 g_assert (monitor_status == MONITOR_STATUS_WAITING_FOR_REQUEST || monitor_status == MONITOR_STATUS_REQUESTED);
852 monitor_sufficient_delay_since_last_dequeue (void)
856 g_assert (threadpool);
858 if (threadpool->cpu_usage < CPU_USAGE_LOW) {
859 threshold = MONITOR_INTERVAL;
861 ThreadPoolCounter counter;
862 counter.as_gint64 = COUNTER_READ();
863 threshold = counter._.max_working * MONITOR_INTERVAL * 2;
866 return mono_msec_ticks () >= threadpool->heuristic_last_dequeue + threshold;
869 static void hill_climbing_force_change (gint16 new_thread_count, ThreadPoolHeuristicStateTransition transition);
872 monitor_thread (void)
874 MonoInternalThread *current_thread = mono_thread_internal_current ();
877 mono_cpu_usage (threadpool->cpu_usage_state);
879 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, started", mono_native_thread_id_get ());
882 ThreadPoolCounter counter;
883 gboolean limit_worker_max_reached;
884 gint32 interval_left = MONITOR_INTERVAL;
885 gint32 awake = 0; /* number of spurious awakes we tolerate before doing a round of rebalancing */
887 g_assert (monitor_status != MONITOR_STATUS_NOT_RUNNING);
889 mono_gc_set_skip_thread (TRUE);
893 gboolean alerted = FALSE;
895 if (mono_runtime_is_shutting_down ())
898 ts = mono_msec_ticks ();
899 if (mono_thread_info_sleep (interval_left, &alerted) == 0)
901 interval_left -= mono_msec_ticks () - ts;
903 mono_gc_set_skip_thread (FALSE);
904 if ((current_thread->state & (ThreadState_StopRequested | ThreadState_SuspendRequested)) != 0)
905 mono_thread_interruption_checkpoint ();
906 mono_gc_set_skip_thread (TRUE);
907 } while (interval_left > 0 && ++awake < 10);
909 mono_gc_set_skip_thread (FALSE);
911 if (threadpool->suspended)
914 if (mono_runtime_is_shutting_down ())
917 mono_coop_mutex_lock (&threadpool->domains_lock);
918 if (!domain_any_has_request ()) {
919 mono_coop_mutex_unlock (&threadpool->domains_lock);
922 mono_coop_mutex_unlock (&threadpool->domains_lock);
924 threadpool->cpu_usage = mono_cpu_usage (threadpool->cpu_usage_state);
926 if (!monitor_sufficient_delay_since_last_dequeue ())
929 limit_worker_max_reached = FALSE;
931 COUNTER_ATOMIC (counter, {
932 if (counter._.max_working >= threadpool->limit_worker_max) {
933 limit_worker_max_reached = TRUE;
936 counter._.max_working ++;
939 if (limit_worker_max_reached)
942 hill_climbing_force_change (counter._.max_working, TRANSITION_STARVATION);
944 for (i = 0; i < 5; ++i) {
945 if (mono_runtime_is_shutting_down ())
948 if (worker_try_unpark ()) {
949 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, unparked", mono_native_thread_id_get ());
953 if (worker_try_create ()) {
954 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, created", mono_native_thread_id_get ());
958 } while (monitor_should_keep_running ());
960 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, finished", mono_native_thread_id_get ());
964 monitor_ensure_running (void)
967 switch (monitor_status) {
968 case MONITOR_STATUS_REQUESTED:
970 case MONITOR_STATUS_WAITING_FOR_REQUEST:
971 InterlockedCompareExchange (&monitor_status, MONITOR_STATUS_REQUESTED, MONITOR_STATUS_WAITING_FOR_REQUEST);
973 case MONITOR_STATUS_NOT_RUNNING:
974 if (mono_runtime_is_shutting_down ())
976 if (InterlockedCompareExchange (&monitor_status, MONITOR_STATUS_REQUESTED, MONITOR_STATUS_NOT_RUNNING) == MONITOR_STATUS_NOT_RUNNING) {
977 if (!mono_thread_create_internal (mono_get_root_domain (), monitor_thread, NULL, TRUE, SMALL_STACK))
978 monitor_status = MONITOR_STATUS_NOT_RUNNING;
982 default: g_assert_not_reached ();
988 hill_climbing_change_thread_count (gint16 new_thread_count, ThreadPoolHeuristicStateTransition transition)
990 ThreadPoolHillClimbing *hc;
992 g_assert (threadpool);
994 hc = &threadpool->heuristic_hill_climbing;
996 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);
998 hc->last_thread_count = new_thread_count;
999 hc->current_sample_interval = rand_next (&hc->random_interval_generator, hc->sample_interval_low, hc->sample_interval_high);
1000 hc->elapsed_since_last_change = 0;
1001 hc->completions_since_last_change = 0;
1005 hill_climbing_force_change (gint16 new_thread_count, ThreadPoolHeuristicStateTransition transition)
1007 ThreadPoolHillClimbing *hc;
1009 g_assert (threadpool);
1011 hc = &threadpool->heuristic_hill_climbing;
1013 if (new_thread_count != hc->last_thread_count) {
1014 hc->current_control_setting += new_thread_count - hc->last_thread_count;
1015 hill_climbing_change_thread_count (new_thread_count, transition);
1019 static double_complex
1020 hill_climbing_get_wave_component (gdouble *samples, guint sample_count, gdouble period)
1022 ThreadPoolHillClimbing *hc;
1023 gdouble w, cosine, sine, coeff, q0, q1, q2;
1026 g_assert (threadpool);
1027 g_assert (sample_count >= period);
1028 g_assert (period >= 2);
1030 hc = &threadpool->heuristic_hill_climbing;
1032 w = 2.0 * M_PI / period;
1035 coeff = 2.0 * cosine;
1038 for (i = 0; i < sample_count; ++i) {
1039 q0 = coeff * q1 - q2 + samples [(hc->total_samples - sample_count + i) % hc->samples_to_measure];
1044 return mono_double_complex_scalar_div (mono_double_complex_make (q1 - q2 * cosine, (q2 * sine)), ((gdouble)sample_count));
1048 hill_climbing_update (gint16 current_thread_count, guint32 sample_duration, gint32 completions, guint32 *adjustment_interval)
1050 ThreadPoolHillClimbing *hc;
1051 ThreadPoolHeuristicStateTransition transition;
1053 gdouble throughput_error_estimate;
1059 gint new_thread_wave_magnitude;
1060 gint new_thread_count;
1061 double_complex thread_wave_component;
1062 double_complex throughput_wave_component;
1063 double_complex ratio;
1065 g_assert (threadpool);
1066 g_assert (adjustment_interval);
1068 hc = &threadpool->heuristic_hill_climbing;
1070 /* If someone changed the thread count without telling us, update our records accordingly. */
1071 if (current_thread_count != hc->last_thread_count)
1072 hill_climbing_force_change (current_thread_count, TRANSITION_INITIALIZING);
1074 /* Update the cumulative stats for this thread count */
1075 hc->elapsed_since_last_change += sample_duration;
1076 hc->completions_since_last_change += completions;
1078 /* Add in any data we've already collected about this sample */
1079 sample_duration += hc->accumulated_sample_duration;
1080 completions += hc->accumulated_completion_count;
1082 /* We need to make sure we're collecting reasonably accurate data. Since we're just counting the end
1083 * of each work item, we are goinng to be missing some data about what really happened during the
1084 * sample interval. The count produced by each thread includes an initial work item that may have
1085 * started well before the start of the interval, and each thread may have been running some new
1086 * work item for some time before the end of the interval, which did not yet get counted. So
1087 * our count is going to be off by +/- threadCount workitems.
1089 * The exception is that the thread that reported to us last time definitely wasn't running any work
1090 * at that time, and the thread that's reporting now definitely isn't running a work item now. So
1091 * we really only need to consider threadCount-1 threads.
1093 * Thus the percent error in our count is +/- (threadCount-1)/numCompletions.
1095 * We cannot rely on the frequency-domain analysis we'll be doing later to filter out this error, because
1096 * of the way it accumulates over time. If this sample is off by, say, 33% in the negative direction,
1097 * then the next one likely will be too. The one after that will include the sum of the completions
1098 * we missed in the previous samples, and so will be 33% positive. So every three samples we'll have
1099 * two "low" samples and one "high" sample. This will appear as periodic variation right in the frequency
1100 * range we're targeting, which will not be filtered by the frequency-domain translation. */
1101 if (hc->total_samples > 0 && ((current_thread_count - 1.0) / completions) >= hc->max_sample_error) {
1102 /* Not accurate enough yet. Let's accumulate the data so
1103 * far, and tell the ThreadPool to collect a little more. */
1104 hc->accumulated_sample_duration = sample_duration;
1105 hc->accumulated_completion_count = completions;
1106 *adjustment_interval = 10;
1107 return current_thread_count;
1110 /* We've got enouugh data for our sample; reset our accumulators for next time. */
1111 hc->accumulated_sample_duration = 0;
1112 hc->accumulated_completion_count = 0;
1114 /* Add the current thread count and throughput sample to our history. */
1115 throughput = ((gdouble) completions) / sample_duration;
1117 sample_index = hc->total_samples % hc->samples_to_measure;
1118 hc->samples [sample_index] = throughput;
1119 hc->thread_counts [sample_index] = current_thread_count;
1120 hc->total_samples ++;
1122 /* Set up defaults for our metrics. */
1123 thread_wave_component = mono_double_complex_make(0, 0);
1124 throughput_wave_component = mono_double_complex_make(0, 0);
1125 throughput_error_estimate = 0;
1126 ratio = mono_double_complex_make(0, 0);
1129 transition = TRANSITION_WARMUP;
1131 /* How many samples will we use? It must be at least the three wave periods we're looking for, and it must also
1132 * be a whole multiple of the primary wave's period; otherwise the frequency we're looking for will fall between
1133 * two frequency bands in the Fourier analysis, and we won't be able to measure it accurately. */
1134 sample_count = ((gint) MIN (hc->total_samples - 1, hc->samples_to_measure) / hc->wave_period) * hc->wave_period;
1136 if (sample_count > hc->wave_period) {
1138 gdouble average_throughput;
1139 gdouble average_thread_count;
1140 gdouble sample_sum = 0;
1141 gdouble thread_sum = 0;
1143 /* Average the throughput and thread count samples, so we can scale the wave magnitudes later. */
1144 for (i = 0; i < sample_count; ++i) {
1145 guint j = (hc->total_samples - sample_count + i) % hc->samples_to_measure;
1146 sample_sum += hc->samples [j];
1147 thread_sum += hc->thread_counts [j];
1150 average_throughput = sample_sum / sample_count;
1151 average_thread_count = thread_sum / sample_count;
1153 if (average_throughput > 0 && average_thread_count > 0) {
1154 gdouble noise_for_confidence, adjacent_period_1, adjacent_period_2;
1156 /* Calculate the periods of the adjacent frequency bands we'll be using to
1157 * measure noise levels. We want the two adjacent Fourier frequency bands. */
1158 adjacent_period_1 = sample_count / (((gdouble) sample_count) / ((gdouble) hc->wave_period) + 1);
1159 adjacent_period_2 = sample_count / (((gdouble) sample_count) / ((gdouble) hc->wave_period) - 1);
1161 /* Get the the three different frequency components of the throughput (scaled by average
1162 * throughput). Our "error" estimate (the amount of noise that might be present in the
1163 * frequency band we're really interested in) is the average of the adjacent bands. */
1164 throughput_wave_component = mono_double_complex_scalar_div (hill_climbing_get_wave_component (hc->samples, sample_count, hc->wave_period), average_throughput);
1165 throughput_error_estimate = cabs (mono_double_complex_scalar_div (hill_climbing_get_wave_component (hc->samples, sample_count, adjacent_period_1), average_throughput));
1167 if (adjacent_period_2 <= sample_count) {
1168 throughput_error_estimate = MAX (throughput_error_estimate, cabs (mono_double_complex_scalar_div (hill_climbing_get_wave_component (
1169 hc->samples, sample_count, adjacent_period_2), average_throughput)));
1172 /* Do the same for the thread counts, so we have something to compare to. We don't
1173 * measure thread count noise, because there is none; these are exact measurements. */
1174 thread_wave_component = mono_double_complex_scalar_div (hill_climbing_get_wave_component (hc->thread_counts, sample_count, hc->wave_period), average_thread_count);
1176 /* Update our moving average of the throughput noise. We'll use this
1177 * later as feedback to determine the new size of the thread wave. */
1178 if (hc->average_throughput_noise == 0) {
1179 hc->average_throughput_noise = throughput_error_estimate;
1181 hc->average_throughput_noise = (hc->throughput_error_smoothing_factor * throughput_error_estimate)
1182 + ((1.0 + hc->throughput_error_smoothing_factor) * hc->average_throughput_noise);
1185 if (cabs (thread_wave_component) > 0) {
1186 /* Adjust the throughput wave so it's centered around the target wave,
1187 * and then calculate the adjusted throughput/thread ratio. */
1188 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);
1189 transition = TRANSITION_CLIMBING_MOVE;
1191 ratio = mono_double_complex_make (0, 0);
1192 transition = TRANSITION_STABILIZING;
1195 noise_for_confidence = MAX (hc->average_throughput_noise, throughput_error_estimate);
1196 if (noise_for_confidence > 0) {
1197 confidence = cabs (thread_wave_component) / noise_for_confidence / hc->target_signal_to_noise_ratio;
1199 /* there is no noise! */
1205 /* We use just the real part of the complex ratio we just calculated. If the throughput signal
1206 * is exactly in phase with the thread signal, this will be the same as taking the magnitude of
1207 * the complex move and moving that far up. If they're 180 degrees out of phase, we'll move
1208 * backward (because this indicates that our changes are having the opposite of the intended effect).
1209 * If they're 90 degrees out of phase, we won't move at all, because we can't tell wether we're
1210 * having a negative or positive effect on throughput. */
1211 move = creal (ratio);
1212 move = CLAMP (move, -1.0, 1.0);
1214 /* Apply our confidence multiplier. */
1215 move *= CLAMP (confidence, -1.0, 1.0);
1217 /* Now apply non-linear gain, such that values around zero are attenuated, while higher values
1218 * are enhanced. This allows us to move quickly if we're far away from the target, but more slowly
1219 * if we're getting close, giving us rapid ramp-up without wild oscillations around the target. */
1220 gain = hc->max_change_per_second * sample_duration;
1221 move = pow (fabs (move), hc->gain_exponent) * (move >= 0.0 ? 1 : -1) * gain;
1222 move = MIN (move, hc->max_change_per_sample);
1224 /* If the result was positive, and CPU is > 95%, refuse the move. */
1225 if (move > 0.0 && threadpool->cpu_usage > CPU_USAGE_HIGH)
1228 /* Apply the move to our control setting. */
1229 hc->current_control_setting += move;
1231 /* Calculate the new thread wave magnitude, which is based on the moving average we've been keeping of the
1232 * throughput error. This average starts at zero, so we'll start with a nice safe little wave at first. */
1233 new_thread_wave_magnitude = (gint)(0.5 + (hc->current_control_setting * hc->average_throughput_noise
1234 * hc->target_signal_to_noise_ratio * hc->thread_magnitude_multiplier * 2.0));
1235 new_thread_wave_magnitude = CLAMP (new_thread_wave_magnitude, 1, hc->max_thread_wave_magnitude);
1237 /* Make sure our control setting is within the ThreadPool's limits. */
1238 hc->current_control_setting = CLAMP (hc->current_control_setting, threadpool->limit_worker_min, threadpool->limit_worker_max - new_thread_wave_magnitude);
1240 /* Calculate the new thread count (control setting + square wave). */
1241 new_thread_count = (gint)(hc->current_control_setting + new_thread_wave_magnitude * ((hc->total_samples / (hc->wave_period / 2)) % 2));
1243 /* Make sure the new thread count doesn't exceed the ThreadPool's limits. */
1244 new_thread_count = CLAMP (new_thread_count, threadpool->limit_worker_min, threadpool->limit_worker_max);
1246 if (new_thread_count != current_thread_count)
1247 hill_climbing_change_thread_count (new_thread_count, transition);
1249 if (creal (ratio) < 0.0 && new_thread_count == threadpool->limit_worker_min)
1250 *adjustment_interval = (gint)(0.5 + hc->current_sample_interval * (10.0 * MAX (-1.0 * creal (ratio), 1.0)));
1252 *adjustment_interval = hc->current_sample_interval;
1254 return new_thread_count;
1258 heuristic_notify_work_completed (void)
1260 g_assert (threadpool);
1262 InterlockedIncrement (&threadpool->heuristic_completions);
1263 threadpool->heuristic_last_dequeue = mono_msec_ticks ();
1267 heuristic_should_adjust (void)
1269 g_assert (threadpool);
1271 if (threadpool->heuristic_last_dequeue > threadpool->heuristic_last_adjustment + threadpool->heuristic_adjustment_interval) {
1272 ThreadPoolCounter counter;
1273 counter.as_gint64 = COUNTER_READ();
1274 if (counter._.working <= counter._.max_working)
1282 heuristic_adjust (void)
1284 g_assert (threadpool);
1286 if (mono_coop_mutex_trylock (&threadpool->heuristic_lock) == 0) {
1287 gint32 completions = InterlockedExchange (&threadpool->heuristic_completions, 0);
1288 guint32 sample_end = mono_msec_ticks ();
1289 guint32 sample_duration = sample_end - threadpool->heuristic_sample_start;
1291 if (sample_duration >= threadpool->heuristic_adjustment_interval / 2) {
1292 ThreadPoolCounter counter;
1293 gint16 new_thread_count;
1295 counter.as_gint64 = COUNTER_READ ();
1296 new_thread_count = hill_climbing_update (counter._.max_working, sample_duration, completions, &threadpool->heuristic_adjustment_interval);
1298 COUNTER_ATOMIC (counter, { counter._.max_working = new_thread_count; });
1300 if (new_thread_count > counter._.max_working)
1301 worker_request (mono_domain_get ());
1303 threadpool->heuristic_sample_start = sample_end;
1304 threadpool->heuristic_last_adjustment = mono_msec_ticks ();
1307 mono_coop_mutex_unlock (&threadpool->heuristic_lock);
1312 mono_threadpool_ms_cleanup (void)
1314 #ifndef DISABLE_SOCKETS
1315 mono_threadpool_ms_io_cleanup ();
1317 mono_lazy_cleanup (&status, cleanup);
1321 mono_threadpool_ms_begin_invoke (MonoDomain *domain, MonoObject *target, MonoMethod *method, gpointer *params, MonoError *error)
1323 static MonoClass *async_call_klass = NULL;
1324 MonoMethodMessage *message;
1325 MonoAsyncResult *async_result;
1326 MonoAsyncCall *async_call;
1327 MonoDelegate *async_callback = NULL;
1328 MonoObject *state = NULL;
1330 if (!async_call_klass)
1331 async_call_klass = mono_class_load_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
1333 mono_lazy_initialize (&status, initialize);
1335 mono_error_init (error);
1337 message = mono_method_call_message_new (method, params, mono_get_delegate_invoke (method->klass), (params != NULL) ? (&async_callback) : NULL, (params != NULL) ? (&state) : NULL);
1339 async_call = (MonoAsyncCall*) mono_object_new_checked (domain, async_call_klass, error);
1340 return_val_if_nok (error, NULL);
1342 MONO_OBJECT_SETREF (async_call, msg, message);
1343 MONO_OBJECT_SETREF (async_call, state, state);
1345 if (async_callback) {
1346 MONO_OBJECT_SETREF (async_call, cb_method, mono_get_delegate_invoke (((MonoObject*) async_callback)->vtable->klass));
1347 MONO_OBJECT_SETREF (async_call, cb_target, async_callback);
1350 async_result = mono_async_result_new (domain, NULL, async_call->state, NULL, (MonoObject*) async_call);
1351 MONO_OBJECT_SETREF (async_result, async_delegate, target);
1353 mono_threadpool_ms_enqueue_work_item (domain, (MonoObject*) async_result, error);
1354 return_val_if_nok (error, NULL);
1356 return async_result;
1360 mono_threadpool_ms_end_invoke (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc)
1365 g_assert (out_args);
1370 /* check if already finished */
1371 mono_monitor_enter ((MonoObject*) ares);
1373 if (ares->endinvoke_called) {
1374 *exc = (MonoObject*) mono_get_exception_invalid_operation (NULL);
1375 mono_monitor_exit ((MonoObject*) ares);
1379 ares->endinvoke_called = 1;
1381 /* wait until we are really finished */
1382 if (ares->completed) {
1383 mono_monitor_exit ((MonoObject *) ares);
1385 gpointer wait_event;
1387 wait_event = mono_wait_handle_get_handle ((MonoWaitHandle*) ares->handle);
1389 wait_event = CreateEvent (NULL, TRUE, FALSE, NULL);
1390 g_assert(wait_event);
1391 MONO_OBJECT_SETREF (ares, handle, (MonoObject*) mono_wait_handle_new (mono_object_domain (ares), wait_event));
1393 mono_monitor_exit ((MonoObject*) ares);
1394 MONO_PREPARE_BLOCKING;
1395 WaitForSingleObjectEx (wait_event, INFINITE, TRUE);
1396 MONO_FINISH_BLOCKING;
1399 ac = (MonoAsyncCall*) ares->object_data;
1402 *exc = ac->msg->exc; /* FIXME: GC add write barrier */
1403 *out_args = ac->out_args;
1408 mono_threadpool_ms_remove_domain_jobs (MonoDomain *domain, int timeout)
1410 gboolean res = TRUE;
1415 g_assert (timeout >= -1);
1417 g_assert (mono_domain_is_unloading (domain));
1420 start = mono_msec_ticks ();
1422 #ifndef DISABLE_SOCKETS
1423 mono_threadpool_ms_io_remove_domain_jobs (domain);
1424 if (timeout != -1) {
1425 timeout -= mono_msec_ticks () - start;
1432 * There might be some threads out that could be about to execute stuff from the given domain.
1433 * We avoid that by setting up a semaphore to be pulsed by the thread that reaches zero.
1435 sem = domain->cleanup_semaphore = CreateSemaphore (NULL, 0, 1, NULL);
1438 * The memory barrier here is required to have global ordering between assigning to cleanup_semaphone
1439 * and reading threadpool_jobs. Otherwise this thread could read a stale version of threadpool_jobs
1442 mono_memory_write_barrier ();
1444 while (domain->threadpool_jobs) {
1445 MONO_PREPARE_BLOCKING;
1446 WaitForSingleObject (sem, timeout);
1447 MONO_FINISH_BLOCKING;
1448 if (timeout != -1) {
1449 timeout -= mono_msec_ticks () - start;
1457 domain->cleanup_semaphore = NULL;
1464 mono_threadpool_ms_suspend (void)
1467 threadpool->suspended = TRUE;
1471 mono_threadpool_ms_resume (void)
1474 threadpool->suspended = FALSE;
1478 ves_icall_System_Threading_ThreadPool_GetAvailableThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
1480 ThreadPoolCounter counter;
1482 if (!worker_threads || !completion_port_threads)
1485 mono_lazy_initialize (&status, initialize);
1487 counter.as_gint64 = COUNTER_READ ();
1489 *worker_threads = MAX (0, threadpool->limit_worker_max - counter._.active);
1490 *completion_port_threads = threadpool->limit_io_max;
1494 ves_icall_System_Threading_ThreadPool_GetMinThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
1496 if (!worker_threads || !completion_port_threads)
1499 mono_lazy_initialize (&status, initialize);
1501 *worker_threads = threadpool->limit_worker_min;
1502 *completion_port_threads = threadpool->limit_io_min;
1506 ves_icall_System_Threading_ThreadPool_GetMaxThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
1508 if (!worker_threads || !completion_port_threads)
1511 mono_lazy_initialize (&status, initialize);
1513 *worker_threads = threadpool->limit_worker_max;
1514 *completion_port_threads = threadpool->limit_io_max;
1518 ves_icall_System_Threading_ThreadPool_SetMinThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
1520 mono_lazy_initialize (&status, initialize);
1522 if (worker_threads <= 0 || worker_threads > threadpool->limit_worker_max)
1524 if (completion_port_threads <= 0 || completion_port_threads > threadpool->limit_io_max)
1527 threadpool->limit_worker_min = worker_threads;
1528 threadpool->limit_io_min = completion_port_threads;
1534 ves_icall_System_Threading_ThreadPool_SetMaxThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
1536 gint cpu_count = mono_cpu_count ();
1538 mono_lazy_initialize (&status, initialize);
1540 if (worker_threads < threadpool->limit_worker_min || worker_threads < cpu_count)
1542 if (completion_port_threads < threadpool->limit_io_min || completion_port_threads < cpu_count)
1545 threadpool->limit_worker_max = worker_threads;
1546 threadpool->limit_io_max = completion_port_threads;
1552 ves_icall_System_Threading_ThreadPool_InitializeVMTp (MonoBoolean *enable_worker_tracking)
1554 if (enable_worker_tracking) {
1555 // TODO implement some kind of switch to have the possibily to use it
1556 *enable_worker_tracking = FALSE;
1559 mono_lazy_initialize (&status, initialize);
1563 ves_icall_System_Threading_ThreadPool_NotifyWorkItemComplete (void)
1565 ThreadPoolCounter counter;
1567 if (mono_domain_is_unloading (mono_domain_get ()) || mono_runtime_is_shutting_down ())
1570 heuristic_notify_work_completed ();
1572 if (heuristic_should_adjust ())
1573 heuristic_adjust ();
1575 counter.as_gint64 = COUNTER_READ ();
1576 return counter._.working <= counter._.max_working;
1580 ves_icall_System_Threading_ThreadPool_NotifyWorkItemProgressNative (void)
1582 heuristic_notify_work_completed ();
1584 if (heuristic_should_adjust ())
1585 heuristic_adjust ();
1589 ves_icall_System_Threading_ThreadPool_ReportThreadStatus (MonoBoolean is_working)
1593 mono_error_set_not_implemented (&error, "");
1594 mono_error_set_pending_exception (&error);
1598 ves_icall_System_Threading_ThreadPool_RequestWorkerThread (void)
1600 return worker_request (mono_domain_get ());
1603 MonoBoolean G_GNUC_UNUSED
1604 ves_icall_System_Threading_ThreadPool_PostQueuedCompletionStatus (MonoNativeOverlapped *native_overlapped)
1606 /* This copy the behavior of the current Mono implementation */
1608 mono_error_set_not_implemented (&error, "");
1609 mono_error_set_pending_exception (&error);
1613 MonoBoolean G_GNUC_UNUSED
1614 ves_icall_System_Threading_ThreadPool_BindIOCompletionCallbackNative (gpointer file_handle)
1616 /* This copy the behavior of the current Mono implementation */
1620 MonoBoolean G_GNUC_UNUSED
1621 ves_icall_System_Threading_ThreadPool_IsThreadPoolHosted (void)