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 100 // ms
50 #define MONITOR_MINIMAL_LIFETIME 60 * 1000 // ms
52 /* The exponent to apply to the gain. 1.0 means to use linear gain,
53 * higher values will enhance large moves and damp small ones.
55 #define HILL_CLIMBING_GAIN_EXPONENT 2.0
57 /* The 'cost' of a thread. 0 means drive for increased throughput regardless
58 * of thread count, higher values bias more against higher thread counts.
60 #define HILL_CLIMBING_BIAS 0.15
62 #define HILL_CLIMBING_WAVE_PERIOD 4
63 #define HILL_CLIMBING_MAX_WAVE_MAGNITUDE 20
64 #define HILL_CLIMBING_WAVE_MAGNITUDE_MULTIPLIER 1.0
65 #define HILL_CLIMBING_WAVE_HISTORY_SIZE 8
66 #define HILL_CLIMBING_TARGET_SIGNAL_TO_NOISE_RATIO 3.0
67 #define HILL_CLIMBING_MAX_CHANGE_PER_SECOND 4
68 #define HILL_CLIMBING_MAX_CHANGE_PER_SAMPLE 20
69 #define HILL_CLIMBING_SAMPLE_INTERVAL_LOW 10
70 #define HILL_CLIMBING_SAMPLE_INTERVAL_HIGH 200
71 #define HILL_CLIMBING_ERROR_SMOOTHING_FACTOR 0.01
72 #define HILL_CLIMBING_MAX_SAMPLE_ERROR_PERCENT 0.15
76 gint16 max_working; /* determined by heuristic */
77 gint16 active; /* executing worker_thread */
78 gint16 working; /* actively executing worker_thread, not parked */
79 gint16 parked; /* parked */
86 gint32 outstanding_request;
89 typedef MonoInternalThread ThreadPoolWorkingThread;
93 gint32 samples_to_measure;
94 gdouble target_throughput_ratio;
95 gdouble target_signal_to_noise_ratio;
96 gdouble max_change_per_second;
97 gdouble max_change_per_sample;
98 gint32 max_thread_wave_magnitude;
99 gint32 sample_interval_low;
100 gdouble thread_magnitude_multiplier;
101 gint32 sample_interval_high;
102 gdouble throughput_error_smoothing_factor;
103 gdouble gain_exponent;
104 gdouble max_sample_error;
106 gdouble current_control_setting;
107 gint64 total_samples;
108 gint16 last_thread_count;
109 gdouble elapsed_since_last_change;
110 gdouble completions_since_last_change;
112 gdouble average_throughput_noise;
115 gdouble *thread_counts;
117 guint32 current_sample_interval;
118 gpointer random_interval_generator;
120 gint32 accumulated_completion_count;
121 gdouble accumulated_sample_duration;
122 } ThreadPoolHillClimbing;
125 ThreadPoolCounter counters;
127 GPtrArray *domains; // ThreadPoolDomain* []
128 MonoCoopMutex domains_lock;
130 GPtrArray *working_threads; // ThreadPoolWorkingThread* []
131 gint32 parked_threads_count;
132 MonoCoopCond parked_threads_cond;
133 MonoCoopMutex active_threads_lock; /* protect access to working_threads and parked_threads */
135 gint32 heuristic_completions;
136 guint32 heuristic_sample_start;
137 guint32 heuristic_last_dequeue; // ms
138 guint32 heuristic_last_adjustment; // ms
139 guint32 heuristic_adjustment_interval; // ms
140 ThreadPoolHillClimbing heuristic_hill_climbing;
141 MonoCoopMutex heuristic_lock;
143 gint32 limit_worker_min;
144 gint32 limit_worker_max;
148 MonoCpuUsageState *cpu_usage_state;
151 /* suspended by the debugger */
157 TRANSITION_INITIALIZING,
158 TRANSITION_RANDOM_MOVE,
159 TRANSITION_CLIMBING_MOVE,
160 TRANSITION_CHANGE_POINT,
161 TRANSITION_STABILIZING,
162 TRANSITION_STARVATION,
163 TRANSITION_THREAD_TIMED_OUT,
164 TRANSITION_UNDEFINED,
165 } ThreadPoolHeuristicStateTransition;
167 static mono_lazy_init_t status = MONO_LAZY_INIT_STATUS_NOT_INITIALIZED;
170 MONITOR_STATUS_REQUESTED,
171 MONITOR_STATUS_WAITING_FOR_REQUEST,
172 MONITOR_STATUS_NOT_RUNNING,
175 static gint32 monitor_status = MONITOR_STATUS_NOT_RUNNING;
177 static ThreadPool* threadpool;
179 #define COUNTER_CHECK(counter) \
181 g_assert (counter._.max_working > 0); \
182 g_assert (counter._.working >= 0); \
183 g_assert (counter._.active >= 0); \
186 #define COUNTER_READ() (InterlockedRead64 (&threadpool->counters.as_gint64))
188 #define COUNTER_ATOMIC(var,block) \
190 ThreadPoolCounter __old; \
192 g_assert (threadpool); \
193 __old.as_gint64 = COUNTER_READ (); \
196 COUNTER_CHECK (var); \
197 } while (InterlockedCompareExchange64 (&threadpool->counters.as_gint64, (var).as_gint64, __old.as_gint64) != __old.as_gint64); \
200 #define COUNTER_TRY_ATOMIC(res,var,block) \
202 ThreadPoolCounter __old; \
204 g_assert (threadpool); \
205 __old.as_gint64 = COUNTER_READ (); \
209 COUNTER_CHECK (var); \
210 (res) = InterlockedCompareExchange64 (&threadpool->counters.as_gint64, (var).as_gint64, __old.as_gint64) == __old.as_gint64; \
218 return mono_rand_init (NULL, 0);
222 rand_next (gpointer *handle, guint32 min, guint32 max)
225 if (!mono_rand_try_get_uint32 (handle, &val, min, max)) {
226 // FIXME handle error
227 g_assert_not_reached ();
233 rand_free (gpointer handle)
235 mono_rand_close (handle);
241 ThreadPoolHillClimbing *hc;
242 const char *threads_per_cpu_env;
243 gint threads_per_cpu;
246 g_assert (!threadpool);
247 threadpool = g_new0 (ThreadPool, 1);
248 g_assert (threadpool);
250 threadpool->domains = g_ptr_array_new ();
251 mono_coop_mutex_init (&threadpool->domains_lock);
253 threadpool->parked_threads_count = 0;
254 mono_coop_cond_init (&threadpool->parked_threads_cond);
255 threadpool->working_threads = g_ptr_array_new ();
256 mono_coop_mutex_init (&threadpool->active_threads_lock);
258 threadpool->heuristic_adjustment_interval = 10;
259 mono_coop_mutex_init (&threadpool->heuristic_lock);
263 hc = &threadpool->heuristic_hill_climbing;
265 hc->wave_period = HILL_CLIMBING_WAVE_PERIOD;
266 hc->max_thread_wave_magnitude = HILL_CLIMBING_MAX_WAVE_MAGNITUDE;
267 hc->thread_magnitude_multiplier = (gdouble) HILL_CLIMBING_WAVE_MAGNITUDE_MULTIPLIER;
268 hc->samples_to_measure = hc->wave_period * HILL_CLIMBING_WAVE_HISTORY_SIZE;
269 hc->target_throughput_ratio = (gdouble) HILL_CLIMBING_BIAS;
270 hc->target_signal_to_noise_ratio = (gdouble) HILL_CLIMBING_TARGET_SIGNAL_TO_NOISE_RATIO;
271 hc->max_change_per_second = (gdouble) HILL_CLIMBING_MAX_CHANGE_PER_SECOND;
272 hc->max_change_per_sample = (gdouble) HILL_CLIMBING_MAX_CHANGE_PER_SAMPLE;
273 hc->sample_interval_low = HILL_CLIMBING_SAMPLE_INTERVAL_LOW;
274 hc->sample_interval_high = HILL_CLIMBING_SAMPLE_INTERVAL_HIGH;
275 hc->throughput_error_smoothing_factor = (gdouble) HILL_CLIMBING_ERROR_SMOOTHING_FACTOR;
276 hc->gain_exponent = (gdouble) HILL_CLIMBING_GAIN_EXPONENT;
277 hc->max_sample_error = (gdouble) HILL_CLIMBING_MAX_SAMPLE_ERROR_PERCENT;
278 hc->current_control_setting = 0;
279 hc->total_samples = 0;
280 hc->last_thread_count = 0;
281 hc->average_throughput_noise = 0;
282 hc->elapsed_since_last_change = 0;
283 hc->accumulated_completion_count = 0;
284 hc->accumulated_sample_duration = 0;
285 hc->samples = g_new0 (gdouble, hc->samples_to_measure);
286 hc->thread_counts = g_new0 (gdouble, hc->samples_to_measure);
287 hc->random_interval_generator = rand_create ();
288 hc->current_sample_interval = rand_next (&hc->random_interval_generator, hc->sample_interval_low, hc->sample_interval_high);
290 if (!(threads_per_cpu_env = g_getenv ("MONO_THREADS_PER_CPU")))
293 threads_per_cpu = CLAMP (atoi (threads_per_cpu_env), 1, 50);
295 threads_count = mono_cpu_count () * threads_per_cpu;
297 threadpool->limit_worker_min = threadpool->limit_io_min = threads_count;
298 threadpool->limit_worker_max = threadpool->limit_io_max = threads_count * 100;
300 threadpool->counters._.max_working = threadpool->limit_worker_min;
302 threadpool->cpu_usage_state = g_new0 (MonoCpuUsageState, 1);
304 threadpool->suspended = FALSE;
307 static void worker_kill (ThreadPoolWorkingThread *thread);
314 /* we make the assumption along the code that we are
315 * cleaning up only if the runtime is shutting down */
316 g_assert (mono_runtime_is_shutting_down ());
318 while (monitor_status != MONITOR_STATUS_NOT_RUNNING)
319 mono_thread_info_sleep (1, NULL);
321 mono_coop_mutex_lock (&threadpool->active_threads_lock);
323 /* stop all threadpool->working_threads */
324 for (i = 0; i < threadpool->working_threads->len; ++i)
325 worker_kill ((ThreadPoolWorkingThread*) g_ptr_array_index (threadpool->working_threads, i));
327 /* unpark all threadpool->parked_threads */
328 mono_coop_cond_broadcast (&threadpool->parked_threads_cond);
330 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
334 mono_threadpool_ms_enqueue_work_item (MonoDomain *domain, MonoObject *work_item)
336 static MonoClass *threadpool_class = NULL;
337 static MonoMethod *unsafe_queue_custom_work_item_method = NULL;
338 MonoDomain *current_domain;
342 g_assert (work_item);
344 if (!threadpool_class)
345 threadpool_class = mono_class_from_name (mono_defaults.corlib, "System.Threading", "ThreadPool");
346 g_assert (threadpool_class);
348 if (!unsafe_queue_custom_work_item_method)
349 unsafe_queue_custom_work_item_method = mono_class_get_method_from_name (threadpool_class, "UnsafeQueueCustomWorkItem", 2);
350 g_assert (unsafe_queue_custom_work_item_method);
354 args [0] = (gpointer) work_item;
355 args [1] = (gpointer) &f;
357 current_domain = mono_domain_get ();
358 if (current_domain == domain) {
359 mono_runtime_invoke (unsafe_queue_custom_work_item_method, NULL, args, NULL);
361 mono_thread_push_appdomain_ref (domain);
362 if (mono_domain_set (domain, FALSE)) {
363 mono_runtime_invoke (unsafe_queue_custom_work_item_method, NULL, args, NULL);
364 mono_domain_set (current_domain, TRUE);
366 mono_thread_pop_appdomain_ref ();
370 /* LOCKING: threadpool->domains_lock must be held */
372 domain_add (ThreadPoolDomain *tpdomain)
378 len = threadpool->domains->len;
379 for (i = 0; i < len; ++i) {
380 if (g_ptr_array_index (threadpool->domains, i) == tpdomain)
385 g_ptr_array_add (threadpool->domains, tpdomain);
388 /* LOCKING: threadpool->domains_lock must be held */
390 domain_remove (ThreadPoolDomain *tpdomain)
393 return g_ptr_array_remove (threadpool->domains, tpdomain);
396 /* LOCKING: threadpool->domains_lock must be held */
397 static ThreadPoolDomain *
398 domain_get (MonoDomain *domain, gboolean create)
400 ThreadPoolDomain *tpdomain = NULL;
405 for (i = 0; i < threadpool->domains->len; ++i) {
406 tpdomain = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i);
407 if (tpdomain->domain == domain)
412 tpdomain = g_new0 (ThreadPoolDomain, 1);
413 tpdomain->domain = domain;
414 domain_add (tpdomain);
421 domain_free (ThreadPoolDomain *tpdomain)
426 /* LOCKING: threadpool->domains_lock must be held */
428 domain_any_has_request (void)
432 for (i = 0; i < threadpool->domains->len; ++i) {
433 ThreadPoolDomain *tmp = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i);
434 if (tmp->outstanding_request > 0)
441 /* LOCKING: threadpool->domains_lock must be held */
442 static ThreadPoolDomain *
443 domain_get_next (ThreadPoolDomain *current)
445 ThreadPoolDomain *tpdomain = NULL;
448 len = threadpool->domains->len;
450 guint i, current_idx = -1;
452 for (i = 0; i < len; ++i) {
453 if (current == g_ptr_array_index (threadpool->domains, i)) {
458 g_assert (current_idx >= 0);
460 for (i = current_idx + 1; i < len + current_idx + 1; ++i) {
461 ThreadPoolDomain *tmp = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i % len);
462 if (tmp->outstanding_request > 0) {
473 worker_wait_interrupt (gpointer data)
475 mono_coop_mutex_lock (&threadpool->active_threads_lock);
476 mono_coop_cond_signal (&threadpool->parked_threads_cond);
477 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
480 /* return TRUE if timeout, FALSE otherwise (worker unpark or interrupt) */
484 gboolean timeout = FALSE;
486 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] current worker parking", mono_native_thread_id_get ());
488 mono_gc_set_skip_thread (TRUE);
490 mono_coop_mutex_lock (&threadpool->active_threads_lock);
492 if (!mono_runtime_is_shutting_down ()) {
493 static gpointer rand_handle = NULL;
494 MonoInternalThread *thread_internal;
495 gboolean interrupted = FALSE;
498 rand_handle = rand_create ();
499 g_assert (rand_handle);
501 thread_internal = mono_thread_internal_current ();
502 g_assert (thread_internal);
504 threadpool->parked_threads_count += 1;
505 g_ptr_array_remove_fast (threadpool->working_threads, thread_internal);
507 mono_thread_info_install_interrupt (worker_wait_interrupt, NULL, &interrupted);
511 if (mono_coop_cond_timedwait (&threadpool->parked_threads_cond, &threadpool->active_threads_lock, rand_next ((void **)rand_handle, 5 * 1000, 60 * 1000)) != 0)
514 mono_thread_info_uninstall_interrupt (&interrupted);
517 g_ptr_array_add (threadpool->working_threads, thread_internal);
518 threadpool->parked_threads_count -= 1;
521 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
523 mono_gc_set_skip_thread (FALSE);
525 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] current worker unparking, timeout? %s", mono_native_thread_id_get (), timeout ? "yes" : "no");
531 worker_try_unpark (void)
533 gboolean res = FALSE;
535 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try unpark worker", mono_native_thread_id_get ());
537 mono_coop_mutex_lock (&threadpool->active_threads_lock);
538 if (threadpool->parked_threads_count > 0) {
539 mono_coop_cond_signal (&threadpool->parked_threads_cond);
542 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
544 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try unpark worker, success? %s", mono_native_thread_id_get (), res ? "yes" : "no");
550 worker_kill (ThreadPoolWorkingThread *thread)
552 if (thread == mono_thread_internal_current ())
555 mono_thread_internal_stop ((MonoInternalThread*) thread);
559 worker_thread (gpointer data)
561 MonoInternalThread *thread;
562 ThreadPoolDomain *tpdomain, *previous_tpdomain;
563 ThreadPoolCounter counter;
564 gboolean retire = FALSE;
566 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_THREADPOOL, "[%p] worker starting", mono_native_thread_id_get ());
568 g_assert (threadpool);
570 thread = mono_thread_internal_current ();
573 mono_thread_set_name_internal (thread, mono_string_new (mono_domain_get (), "Threadpool worker"), FALSE);
575 mono_coop_mutex_lock (&threadpool->active_threads_lock);
576 g_ptr_array_add (threadpool->working_threads, thread);
577 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
579 previous_tpdomain = NULL;
581 mono_coop_mutex_lock (&threadpool->domains_lock);
583 while (!mono_runtime_is_shutting_down ()) {
586 if ((thread->state & (ThreadState_StopRequested | ThreadState_SuspendRequested)) != 0) {
587 mono_coop_mutex_unlock (&threadpool->domains_lock);
588 mono_thread_interruption_checkpoint ();
589 mono_coop_mutex_lock (&threadpool->domains_lock);
592 if (retire || !(tpdomain = domain_get_next (previous_tpdomain))) {
595 COUNTER_ATOMIC (counter, {
596 counter._.working --;
600 mono_coop_mutex_unlock (&threadpool->domains_lock);
601 timeout = worker_park ();
602 mono_coop_mutex_lock (&threadpool->domains_lock);
604 COUNTER_ATOMIC (counter, {
605 counter._.working ++;
618 tpdomain->outstanding_request --;
619 g_assert (tpdomain->outstanding_request >= 0);
621 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] worker running in domain %p",
622 mono_native_thread_id_get (), tpdomain->domain, tpdomain->outstanding_request);
624 g_assert (tpdomain->domain);
625 g_assert (tpdomain->domain->threadpool_jobs >= 0);
626 tpdomain->domain->threadpool_jobs ++;
628 mono_coop_mutex_unlock (&threadpool->domains_lock);
630 mono_thread_push_appdomain_ref (tpdomain->domain);
631 if (mono_domain_set (tpdomain->domain, FALSE)) {
632 MonoObject *exc = NULL;
633 MonoObject *res = mono_runtime_invoke (mono_defaults.threadpool_perform_wait_callback_method, NULL, NULL, &exc);
635 mono_thread_internal_unhandled_exception (exc);
636 else if (res && *(MonoBoolean*) mono_object_unbox (res) == FALSE)
639 mono_thread_clr_state (thread, (MonoThreadState)~ThreadState_Background);
640 if (!mono_thread_test_state (thread , ThreadState_Background))
641 ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background);
643 mono_domain_set (mono_get_root_domain (), TRUE);
645 mono_thread_pop_appdomain_ref ();
647 mono_coop_mutex_lock (&threadpool->domains_lock);
649 tpdomain->domain->threadpool_jobs --;
650 g_assert (tpdomain->domain->threadpool_jobs >= 0);
652 if (tpdomain->domain->threadpool_jobs == 0 && mono_domain_is_unloading (tpdomain->domain)) {
653 gboolean removed = domain_remove (tpdomain);
655 if (tpdomain->domain->cleanup_semaphore)
656 ReleaseSemaphore (tpdomain->domain->cleanup_semaphore, 1, NULL);
657 domain_free (tpdomain);
661 previous_tpdomain = tpdomain;
664 mono_coop_mutex_unlock (&threadpool->domains_lock);
666 mono_coop_mutex_lock (&threadpool->active_threads_lock);
667 g_ptr_array_remove_fast (threadpool->working_threads, thread);
668 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
670 COUNTER_ATOMIC (counter, {
675 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_THREADPOOL, "[%p] worker finishing", mono_native_thread_id_get ());
679 worker_try_create (void)
681 ThreadPoolCounter counter;
682 MonoInternalThread *thread;
684 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try create worker", mono_native_thread_id_get ());
686 COUNTER_ATOMIC (counter, {
687 if (counter._.working >= counter._.max_working)
689 counter._.working ++;
693 if ((thread = mono_thread_create_internal (mono_get_root_domain (), worker_thread, NULL, TRUE, 0)) != NULL) {
694 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try create worker, created %p",
695 mono_native_thread_id_get (), thread->tid);
699 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try create worker, failed", mono_native_thread_id_get ());
701 COUNTER_ATOMIC (counter, {
702 counter._.working --;
709 static void monitor_ensure_running (void);
712 worker_request (MonoDomain *domain)
714 ThreadPoolDomain *tpdomain;
717 g_assert (threadpool);
719 if (mono_runtime_is_shutting_down ())
722 mono_coop_mutex_lock (&threadpool->domains_lock);
724 /* synchronize check with worker_thread */
725 if (mono_domain_is_unloading (domain)) {
726 mono_coop_mutex_unlock (&threadpool->domains_lock);
730 tpdomain = domain_get (domain, TRUE);
732 tpdomain->outstanding_request ++;
734 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, domain = %p, outstanding_request = %d",
735 mono_native_thread_id_get (), tpdomain->domain, tpdomain->outstanding_request);
737 mono_coop_mutex_unlock (&threadpool->domains_lock);
739 if (threadpool->suspended)
742 monitor_ensure_running ();
744 if (worker_try_unpark ()) {
745 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, unparked", mono_native_thread_id_get ());
749 if (worker_try_create ()) {
750 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, created", mono_native_thread_id_get ());
754 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, failed", mono_native_thread_id_get ());
759 monitor_should_keep_running (void)
761 static gint64 last_should_keep_running = -1;
763 g_assert (monitor_status == MONITOR_STATUS_WAITING_FOR_REQUEST || monitor_status == MONITOR_STATUS_REQUESTED);
765 if (InterlockedExchange (&monitor_status, MONITOR_STATUS_WAITING_FOR_REQUEST) == MONITOR_STATUS_WAITING_FOR_REQUEST) {
766 gboolean should_keep_running = TRUE, force_should_keep_running = FALSE;
768 if (mono_runtime_is_shutting_down ()) {
769 should_keep_running = FALSE;
771 mono_coop_mutex_lock (&threadpool->domains_lock);
772 if (!domain_any_has_request ())
773 should_keep_running = FALSE;
774 mono_coop_mutex_unlock (&threadpool->domains_lock);
776 if (!should_keep_running) {
777 if (last_should_keep_running == -1 || mono_100ns_ticks () - last_should_keep_running < MONITOR_MINIMAL_LIFETIME * 1000 * 10) {
778 should_keep_running = force_should_keep_running = TRUE;
783 if (should_keep_running) {
784 if (last_should_keep_running == -1 || !force_should_keep_running)
785 last_should_keep_running = mono_100ns_ticks ();
787 last_should_keep_running = -1;
788 if (InterlockedCompareExchange (&monitor_status, MONITOR_STATUS_NOT_RUNNING, MONITOR_STATUS_WAITING_FOR_REQUEST) == MONITOR_STATUS_WAITING_FOR_REQUEST)
793 g_assert (monitor_status == MONITOR_STATUS_WAITING_FOR_REQUEST || monitor_status == MONITOR_STATUS_REQUESTED);
799 monitor_sufficient_delay_since_last_dequeue (void)
803 g_assert (threadpool);
805 if (threadpool->cpu_usage < CPU_USAGE_LOW) {
806 threshold = MONITOR_INTERVAL;
808 ThreadPoolCounter counter;
809 counter.as_gint64 = COUNTER_READ();
810 threshold = counter._.max_working * MONITOR_INTERVAL * 2;
813 return mono_msec_ticks () >= threadpool->heuristic_last_dequeue + threshold;
816 static void hill_climbing_force_change (gint16 new_thread_count, ThreadPoolHeuristicStateTransition transition);
819 monitor_thread (void)
821 MonoInternalThread *current_thread = mono_thread_internal_current ();
824 mono_cpu_usage (threadpool->cpu_usage_state);
826 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, started", mono_native_thread_id_get ());
829 MonoInternalThread *thread;
830 gboolean all_waitsleepjoin = TRUE;
831 gint32 interval_left = MONITOR_INTERVAL;
832 gint32 awake = 0; /* number of spurious awakes we tolerate before doing a round of rebalancing */
834 g_assert (monitor_status != MONITOR_STATUS_NOT_RUNNING);
836 mono_gc_set_skip_thread (TRUE);
840 gboolean alerted = FALSE;
842 if (mono_runtime_is_shutting_down ())
845 ts = mono_msec_ticks ();
846 if (mono_thread_info_sleep (interval_left, &alerted) == 0)
848 interval_left -= mono_msec_ticks () - ts;
850 mono_gc_set_skip_thread (FALSE);
851 if ((current_thread->state & (ThreadState_StopRequested | ThreadState_SuspendRequested)) != 0)
852 mono_thread_interruption_checkpoint ();
853 mono_gc_set_skip_thread (TRUE);
854 } while (interval_left > 0 && ++awake < 10);
856 mono_gc_set_skip_thread (FALSE);
858 if (threadpool->suspended)
861 if (mono_runtime_is_shutting_down ())
864 mono_coop_mutex_lock (&threadpool->domains_lock);
865 if (!domain_any_has_request ()) {
866 mono_coop_mutex_unlock (&threadpool->domains_lock);
869 mono_coop_mutex_unlock (&threadpool->domains_lock);
872 mono_coop_mutex_lock (&threadpool->active_threads_lock);
873 for (i = 0; i < threadpool->working_threads->len; ++i) {
874 thread = (MonoInternalThread *)g_ptr_array_index (threadpool->working_threads, i);
875 if ((thread->state & ThreadState_WaitSleepJoin) == 0) {
876 all_waitsleepjoin = FALSE;
880 mono_coop_mutex_unlock (&threadpool->active_threads_lock);
882 if (all_waitsleepjoin) {
883 ThreadPoolCounter counter;
884 COUNTER_ATOMIC (counter, { counter._.max_working ++; });
885 hill_climbing_force_change (counter._.max_working, TRANSITION_STARVATION);
888 threadpool->cpu_usage = mono_cpu_usage (threadpool->cpu_usage_state);
890 if (monitor_sufficient_delay_since_last_dequeue ()) {
891 for (i = 0; i < 5; ++i) {
892 if (mono_runtime_is_shutting_down ())
895 if (worker_try_unpark ()) {
896 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, unparked", mono_native_thread_id_get ());
900 if (worker_try_create ()) {
901 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, created", mono_native_thread_id_get ());
906 } while (monitor_should_keep_running ());
908 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, finished", mono_native_thread_id_get ());
912 monitor_ensure_running (void)
915 switch (monitor_status) {
916 case MONITOR_STATUS_REQUESTED:
918 case MONITOR_STATUS_WAITING_FOR_REQUEST:
919 InterlockedCompareExchange (&monitor_status, MONITOR_STATUS_REQUESTED, MONITOR_STATUS_WAITING_FOR_REQUEST);
921 case MONITOR_STATUS_NOT_RUNNING:
922 if (mono_runtime_is_shutting_down ())
924 if (InterlockedCompareExchange (&monitor_status, MONITOR_STATUS_REQUESTED, MONITOR_STATUS_NOT_RUNNING) == MONITOR_STATUS_NOT_RUNNING) {
925 if (!mono_thread_create_internal (mono_get_root_domain (), monitor_thread, NULL, TRUE, SMALL_STACK))
926 monitor_status = MONITOR_STATUS_NOT_RUNNING;
930 default: g_assert_not_reached ();
936 hill_climbing_change_thread_count (gint16 new_thread_count, ThreadPoolHeuristicStateTransition transition)
938 ThreadPoolHillClimbing *hc;
940 g_assert (threadpool);
942 hc = &threadpool->heuristic_hill_climbing;
944 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);
946 hc->last_thread_count = new_thread_count;
947 hc->current_sample_interval = rand_next (&hc->random_interval_generator, hc->sample_interval_low, hc->sample_interval_high);
948 hc->elapsed_since_last_change = 0;
949 hc->completions_since_last_change = 0;
953 hill_climbing_force_change (gint16 new_thread_count, ThreadPoolHeuristicStateTransition transition)
955 ThreadPoolHillClimbing *hc;
957 g_assert (threadpool);
959 hc = &threadpool->heuristic_hill_climbing;
961 if (new_thread_count != hc->last_thread_count) {
962 hc->current_control_setting += new_thread_count - hc->last_thread_count;
963 hill_climbing_change_thread_count (new_thread_count, transition);
967 static double_complex
968 hill_climbing_get_wave_component (gdouble *samples, guint sample_count, gdouble period)
970 ThreadPoolHillClimbing *hc;
971 gdouble w, cosine, sine, coeff, q0, q1, q2;
974 g_assert (threadpool);
975 g_assert (sample_count >= period);
976 g_assert (period >= 2);
978 hc = &threadpool->heuristic_hill_climbing;
980 w = 2.0 * M_PI / period;
983 coeff = 2.0 * cosine;
986 for (i = 0; i < sample_count; ++i) {
987 q0 = coeff * q1 - q2 + samples [(hc->total_samples - sample_count + i) % hc->samples_to_measure];
992 return mono_double_complex_scalar_div (mono_double_complex_make (q1 - q2 * cosine, (q2 * sine)), ((gdouble)sample_count));
996 hill_climbing_update (gint16 current_thread_count, guint32 sample_duration, gint32 completions, guint32 *adjustment_interval)
998 ThreadPoolHillClimbing *hc;
999 ThreadPoolHeuristicStateTransition transition;
1001 gdouble throughput_error_estimate;
1007 gint new_thread_wave_magnitude;
1008 gint new_thread_count;
1009 double_complex thread_wave_component;
1010 double_complex throughput_wave_component;
1011 double_complex ratio;
1013 g_assert (threadpool);
1014 g_assert (adjustment_interval);
1016 hc = &threadpool->heuristic_hill_climbing;
1018 /* If someone changed the thread count without telling us, update our records accordingly. */
1019 if (current_thread_count != hc->last_thread_count)
1020 hill_climbing_force_change (current_thread_count, TRANSITION_INITIALIZING);
1022 /* Update the cumulative stats for this thread count */
1023 hc->elapsed_since_last_change += sample_duration;
1024 hc->completions_since_last_change += completions;
1026 /* Add in any data we've already collected about this sample */
1027 sample_duration += hc->accumulated_sample_duration;
1028 completions += hc->accumulated_completion_count;
1030 /* We need to make sure we're collecting reasonably accurate data. Since we're just counting the end
1031 * of each work item, we are goinng to be missing some data about what really happened during the
1032 * sample interval. The count produced by each thread includes an initial work item that may have
1033 * started well before the start of the interval, and each thread may have been running some new
1034 * work item for some time before the end of the interval, which did not yet get counted. So
1035 * our count is going to be off by +/- threadCount workitems.
1037 * The exception is that the thread that reported to us last time definitely wasn't running any work
1038 * at that time, and the thread that's reporting now definitely isn't running a work item now. So
1039 * we really only need to consider threadCount-1 threads.
1041 * Thus the percent error in our count is +/- (threadCount-1)/numCompletions.
1043 * We cannot rely on the frequency-domain analysis we'll be doing later to filter out this error, because
1044 * of the way it accumulates over time. If this sample is off by, say, 33% in the negative direction,
1045 * then the next one likely will be too. The one after that will include the sum of the completions
1046 * we missed in the previous samples, and so will be 33% positive. So every three samples we'll have
1047 * two "low" samples and one "high" sample. This will appear as periodic variation right in the frequency
1048 * range we're targeting, which will not be filtered by the frequency-domain translation. */
1049 if (hc->total_samples > 0 && ((current_thread_count - 1.0) / completions) >= hc->max_sample_error) {
1050 /* Not accurate enough yet. Let's accumulate the data so
1051 * far, and tell the ThreadPool to collect a little more. */
1052 hc->accumulated_sample_duration = sample_duration;
1053 hc->accumulated_completion_count = completions;
1054 *adjustment_interval = 10;
1055 return current_thread_count;
1058 /* We've got enouugh data for our sample; reset our accumulators for next time. */
1059 hc->accumulated_sample_duration = 0;
1060 hc->accumulated_completion_count = 0;
1062 /* Add the current thread count and throughput sample to our history. */
1063 throughput = ((gdouble) completions) / sample_duration;
1065 sample_index = hc->total_samples % hc->samples_to_measure;
1066 hc->samples [sample_index] = throughput;
1067 hc->thread_counts [sample_index] = current_thread_count;
1068 hc->total_samples ++;
1070 /* Set up defaults for our metrics. */
1071 thread_wave_component = mono_double_complex_make(0, 0);
1072 throughput_wave_component = mono_double_complex_make(0, 0);
1073 throughput_error_estimate = 0;
1074 ratio = mono_double_complex_make(0, 0);
1077 transition = TRANSITION_WARMUP;
1079 /* How many samples will we use? It must be at least the three wave periods we're looking for, and it must also
1080 * be a whole multiple of the primary wave's period; otherwise the frequency we're looking for will fall between
1081 * two frequency bands in the Fourier analysis, and we won't be able to measure it accurately. */
1082 sample_count = ((gint) MIN (hc->total_samples - 1, hc->samples_to_measure) / hc->wave_period) * hc->wave_period;
1084 if (sample_count > hc->wave_period) {
1086 gdouble average_throughput;
1087 gdouble average_thread_count;
1088 gdouble sample_sum = 0;
1089 gdouble thread_sum = 0;
1091 /* Average the throughput and thread count samples, so we can scale the wave magnitudes later. */
1092 for (i = 0; i < sample_count; ++i) {
1093 guint j = (hc->total_samples - sample_count + i) % hc->samples_to_measure;
1094 sample_sum += hc->samples [j];
1095 thread_sum += hc->thread_counts [j];
1098 average_throughput = sample_sum / sample_count;
1099 average_thread_count = thread_sum / sample_count;
1101 if (average_throughput > 0 && average_thread_count > 0) {
1102 gdouble noise_for_confidence, adjacent_period_1, adjacent_period_2;
1104 /* Calculate the periods of the adjacent frequency bands we'll be using to
1105 * measure noise levels. We want the two adjacent Fourier frequency bands. */
1106 adjacent_period_1 = sample_count / (((gdouble) sample_count) / ((gdouble) hc->wave_period) + 1);
1107 adjacent_period_2 = sample_count / (((gdouble) sample_count) / ((gdouble) hc->wave_period) - 1);
1109 /* Get the the three different frequency components of the throughput (scaled by average
1110 * throughput). Our "error" estimate (the amount of noise that might be present in the
1111 * frequency band we're really interested in) is the average of the adjacent bands. */
1112 throughput_wave_component = mono_double_complex_scalar_div (hill_climbing_get_wave_component (hc->samples, sample_count, hc->wave_period), average_throughput);
1113 throughput_error_estimate = cabs (mono_double_complex_scalar_div (hill_climbing_get_wave_component (hc->samples, sample_count, adjacent_period_1), average_throughput));
1115 if (adjacent_period_2 <= sample_count) {
1116 throughput_error_estimate = MAX (throughput_error_estimate, cabs (mono_double_complex_scalar_div (hill_climbing_get_wave_component (
1117 hc->samples, sample_count, adjacent_period_2), average_throughput)));
1120 /* Do the same for the thread counts, so we have something to compare to. We don't
1121 * measure thread count noise, because there is none; these are exact measurements. */
1122 thread_wave_component = mono_double_complex_scalar_div (hill_climbing_get_wave_component (hc->thread_counts, sample_count, hc->wave_period), average_thread_count);
1124 /* Update our moving average of the throughput noise. We'll use this
1125 * later as feedback to determine the new size of the thread wave. */
1126 if (hc->average_throughput_noise == 0) {
1127 hc->average_throughput_noise = throughput_error_estimate;
1129 hc->average_throughput_noise = (hc->throughput_error_smoothing_factor * throughput_error_estimate)
1130 + ((1.0 + hc->throughput_error_smoothing_factor) * hc->average_throughput_noise);
1133 if (cabs (thread_wave_component) > 0) {
1134 /* Adjust the throughput wave so it's centered around the target wave,
1135 * and then calculate the adjusted throughput/thread ratio. */
1136 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);
1137 transition = TRANSITION_CLIMBING_MOVE;
1139 ratio = mono_double_complex_make (0, 0);
1140 transition = TRANSITION_STABILIZING;
1143 noise_for_confidence = MAX (hc->average_throughput_noise, throughput_error_estimate);
1144 if (noise_for_confidence > 0) {
1145 confidence = cabs (thread_wave_component) / noise_for_confidence / hc->target_signal_to_noise_ratio;
1147 /* there is no noise! */
1153 /* We use just the real part of the complex ratio we just calculated. If the throughput signal
1154 * is exactly in phase with the thread signal, this will be the same as taking the magnitude of
1155 * the complex move and moving that far up. If they're 180 degrees out of phase, we'll move
1156 * backward (because this indicates that our changes are having the opposite of the intended effect).
1157 * If they're 90 degrees out of phase, we won't move at all, because we can't tell wether we're
1158 * having a negative or positive effect on throughput. */
1159 move = creal (ratio);
1160 move = CLAMP (move, -1.0, 1.0);
1162 /* Apply our confidence multiplier. */
1163 move *= CLAMP (confidence, -1.0, 1.0);
1165 /* Now apply non-linear gain, such that values around zero are attenuated, while higher values
1166 * are enhanced. This allows us to move quickly if we're far away from the target, but more slowly
1167 * if we're getting close, giving us rapid ramp-up without wild oscillations around the target. */
1168 gain = hc->max_change_per_second * sample_duration;
1169 move = pow (fabs (move), hc->gain_exponent) * (move >= 0.0 ? 1 : -1) * gain;
1170 move = MIN (move, hc->max_change_per_sample);
1172 /* If the result was positive, and CPU is > 95%, refuse the move. */
1173 if (move > 0.0 && threadpool->cpu_usage > CPU_USAGE_HIGH)
1176 /* Apply the move to our control setting. */
1177 hc->current_control_setting += move;
1179 /* Calculate the new thread wave magnitude, which is based on the moving average we've been keeping of the
1180 * throughput error. This average starts at zero, so we'll start with a nice safe little wave at first. */
1181 new_thread_wave_magnitude = (gint)(0.5 + (hc->current_control_setting * hc->average_throughput_noise
1182 * hc->target_signal_to_noise_ratio * hc->thread_magnitude_multiplier * 2.0));
1183 new_thread_wave_magnitude = CLAMP (new_thread_wave_magnitude, 1, hc->max_thread_wave_magnitude);
1185 /* Make sure our control setting is within the ThreadPool's limits. */
1186 hc->current_control_setting = CLAMP (hc->current_control_setting, threadpool->limit_worker_min, threadpool->limit_worker_max - new_thread_wave_magnitude);
1188 /* Calculate the new thread count (control setting + square wave). */
1189 new_thread_count = (gint)(hc->current_control_setting + new_thread_wave_magnitude * ((hc->total_samples / (hc->wave_period / 2)) % 2));
1191 /* Make sure the new thread count doesn't exceed the ThreadPool's limits. */
1192 new_thread_count = CLAMP (new_thread_count, threadpool->limit_worker_min, threadpool->limit_worker_max);
1194 if (new_thread_count != current_thread_count)
1195 hill_climbing_change_thread_count (new_thread_count, transition);
1197 if (creal (ratio) < 0.0 && new_thread_count == threadpool->limit_worker_min)
1198 *adjustment_interval = (gint)(0.5 + hc->current_sample_interval * (10.0 * MAX (-1.0 * creal (ratio), 1.0)));
1200 *adjustment_interval = hc->current_sample_interval;
1202 return new_thread_count;
1206 heuristic_notify_work_completed (void)
1208 g_assert (threadpool);
1210 InterlockedIncrement (&threadpool->heuristic_completions);
1211 threadpool->heuristic_last_dequeue = mono_msec_ticks ();
1215 heuristic_should_adjust (void)
1217 g_assert (threadpool);
1219 if (threadpool->heuristic_last_dequeue > threadpool->heuristic_last_adjustment + threadpool->heuristic_adjustment_interval) {
1220 ThreadPoolCounter counter;
1221 counter.as_gint64 = COUNTER_READ();
1222 if (counter._.working <= counter._.max_working)
1230 heuristic_adjust (void)
1232 g_assert (threadpool);
1234 if (mono_coop_mutex_trylock (&threadpool->heuristic_lock) == 0) {
1235 gint32 completions = InterlockedExchange (&threadpool->heuristic_completions, 0);
1236 guint32 sample_end = mono_msec_ticks ();
1237 guint32 sample_duration = sample_end - threadpool->heuristic_sample_start;
1239 if (sample_duration >= threadpool->heuristic_adjustment_interval / 2) {
1240 ThreadPoolCounter counter;
1241 gint16 new_thread_count;
1243 counter.as_gint64 = COUNTER_READ ();
1244 new_thread_count = hill_climbing_update (counter._.max_working, sample_duration, completions, &threadpool->heuristic_adjustment_interval);
1246 COUNTER_ATOMIC (counter, { counter._.max_working = new_thread_count; });
1248 if (new_thread_count > counter._.max_working)
1249 worker_request (mono_domain_get ());
1251 threadpool->heuristic_sample_start = sample_end;
1252 threadpool->heuristic_last_adjustment = mono_msec_ticks ();
1255 mono_coop_mutex_unlock (&threadpool->heuristic_lock);
1260 mono_threadpool_ms_cleanup (void)
1262 #ifndef DISABLE_SOCKETS
1263 mono_threadpool_ms_io_cleanup ();
1265 mono_lazy_cleanup (&status, cleanup);
1269 mono_threadpool_ms_begin_invoke (MonoDomain *domain, MonoObject *target, MonoMethod *method, gpointer *params)
1271 static MonoClass *async_call_klass = NULL;
1272 MonoMethodMessage *message;
1273 MonoAsyncResult *async_result;
1274 MonoAsyncCall *async_call;
1275 MonoDelegate *async_callback = NULL;
1276 MonoObject *state = NULL;
1278 if (!async_call_klass)
1279 async_call_klass = mono_class_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
1280 g_assert (async_call_klass);
1282 mono_lazy_initialize (&status, initialize);
1284 message = mono_method_call_message_new (method, params, mono_get_delegate_invoke (method->klass), (params != NULL) ? (&async_callback) : NULL, (params != NULL) ? (&state) : NULL);
1286 async_call = (MonoAsyncCall*) mono_object_new (domain, async_call_klass);
1287 MONO_OBJECT_SETREF (async_call, msg, message);
1288 MONO_OBJECT_SETREF (async_call, state, state);
1290 if (async_callback) {
1291 MONO_OBJECT_SETREF (async_call, cb_method, mono_get_delegate_invoke (((MonoObject*) async_callback)->vtable->klass));
1292 MONO_OBJECT_SETREF (async_call, cb_target, async_callback);
1295 async_result = mono_async_result_new (domain, NULL, async_call->state, NULL, (MonoObject*) async_call);
1296 MONO_OBJECT_SETREF (async_result, async_delegate, target);
1298 mono_threadpool_ms_enqueue_work_item (domain, (MonoObject*) async_result);
1300 return async_result;
1304 mono_threadpool_ms_end_invoke (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc)
1309 g_assert (out_args);
1314 /* check if already finished */
1315 mono_monitor_enter ((MonoObject*) ares);
1317 if (ares->endinvoke_called) {
1318 *exc = (MonoObject*) mono_get_exception_invalid_operation (NULL);
1319 mono_monitor_exit ((MonoObject*) ares);
1323 ares->endinvoke_called = 1;
1325 /* wait until we are really finished */
1326 if (ares->completed) {
1327 mono_monitor_exit ((MonoObject *) ares);
1329 gpointer wait_event;
1331 wait_event = mono_wait_handle_get_handle ((MonoWaitHandle*) ares->handle);
1333 wait_event = CreateEvent (NULL, TRUE, FALSE, NULL);
1334 g_assert(wait_event);
1335 MONO_OBJECT_SETREF (ares, handle, (MonoObject*) mono_wait_handle_new (mono_object_domain (ares), wait_event));
1337 mono_monitor_exit ((MonoObject*) ares);
1338 MONO_PREPARE_BLOCKING;
1339 WaitForSingleObjectEx (wait_event, INFINITE, TRUE);
1340 MONO_FINISH_BLOCKING;
1343 ac = (MonoAsyncCall*) ares->object_data;
1346 *exc = ac->msg->exc; /* FIXME: GC add write barrier */
1347 *out_args = ac->out_args;
1352 mono_threadpool_ms_remove_domain_jobs (MonoDomain *domain, int timeout)
1354 gboolean res = TRUE;
1359 g_assert (timeout >= -1);
1361 g_assert (mono_domain_is_unloading (domain));
1364 start = mono_msec_ticks ();
1366 #ifndef DISABLE_SOCKETS
1367 mono_threadpool_ms_io_remove_domain_jobs (domain);
1368 if (timeout != -1) {
1369 timeout -= mono_msec_ticks () - start;
1376 * There might be some threads out that could be about to execute stuff from the given domain.
1377 * We avoid that by setting up a semaphore to be pulsed by the thread that reaches zero.
1379 sem = domain->cleanup_semaphore = CreateSemaphore (NULL, 0, 1, NULL);
1382 * The memory barrier here is required to have global ordering between assigning to cleanup_semaphone
1383 * and reading threadpool_jobs. Otherwise this thread could read a stale version of threadpool_jobs
1386 mono_memory_write_barrier ();
1388 while (domain->threadpool_jobs) {
1389 MONO_PREPARE_BLOCKING;
1390 WaitForSingleObject (sem, timeout);
1391 MONO_FINISH_BLOCKING;
1392 if (timeout != -1) {
1393 timeout -= mono_msec_ticks () - start;
1401 domain->cleanup_semaphore = NULL;
1408 mono_threadpool_ms_suspend (void)
1411 threadpool->suspended = TRUE;
1415 mono_threadpool_ms_resume (void)
1418 threadpool->suspended = FALSE;
1422 ves_icall_System_Threading_ThreadPool_GetAvailableThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
1424 ThreadPoolCounter counter;
1426 if (!worker_threads || !completion_port_threads)
1429 mono_lazy_initialize (&status, initialize);
1431 counter.as_gint64 = COUNTER_READ ();
1433 *worker_threads = threadpool->limit_worker_max - counter._.active;
1434 *completion_port_threads = threadpool->limit_io_max;
1438 ves_icall_System_Threading_ThreadPool_GetMinThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
1440 if (!worker_threads || !completion_port_threads)
1443 mono_lazy_initialize (&status, initialize);
1445 *worker_threads = threadpool->limit_worker_min;
1446 *completion_port_threads = threadpool->limit_io_min;
1450 ves_icall_System_Threading_ThreadPool_GetMaxThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
1452 if (!worker_threads || !completion_port_threads)
1455 mono_lazy_initialize (&status, initialize);
1457 *worker_threads = threadpool->limit_worker_max;
1458 *completion_port_threads = threadpool->limit_io_max;
1462 ves_icall_System_Threading_ThreadPool_SetMinThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
1464 mono_lazy_initialize (&status, initialize);
1466 if (worker_threads <= 0 || worker_threads > threadpool->limit_worker_max)
1468 if (completion_port_threads <= 0 || completion_port_threads > threadpool->limit_io_max)
1471 threadpool->limit_worker_min = worker_threads;
1472 threadpool->limit_io_min = completion_port_threads;
1478 ves_icall_System_Threading_ThreadPool_SetMaxThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
1480 gint cpu_count = mono_cpu_count ();
1482 mono_lazy_initialize (&status, initialize);
1484 if (worker_threads < threadpool->limit_worker_min || worker_threads < cpu_count)
1486 if (completion_port_threads < threadpool->limit_io_min || completion_port_threads < cpu_count)
1489 threadpool->limit_worker_max = worker_threads;
1490 threadpool->limit_io_max = completion_port_threads;
1496 ves_icall_System_Threading_ThreadPool_InitializeVMTp (MonoBoolean *enable_worker_tracking)
1498 if (enable_worker_tracking) {
1499 // TODO implement some kind of switch to have the possibily to use it
1500 *enable_worker_tracking = FALSE;
1503 mono_lazy_initialize (&status, initialize);
1507 ves_icall_System_Threading_ThreadPool_NotifyWorkItemComplete (void)
1509 ThreadPoolCounter counter;
1511 if (mono_domain_is_unloading (mono_domain_get ()) || mono_runtime_is_shutting_down ())
1514 heuristic_notify_work_completed ();
1516 if (heuristic_should_adjust ())
1517 heuristic_adjust ();
1519 counter.as_gint64 = COUNTER_READ ();
1520 return counter._.working <= counter._.max_working;
1524 ves_icall_System_Threading_ThreadPool_NotifyWorkItemProgressNative (void)
1526 heuristic_notify_work_completed ();
1528 if (heuristic_should_adjust ())
1529 heuristic_adjust ();
1533 ves_icall_System_Threading_ThreadPool_ReportThreadStatus (MonoBoolean is_working)
1536 mono_raise_exception (mono_get_exception_not_implemented (NULL));
1540 ves_icall_System_Threading_ThreadPool_RequestWorkerThread (void)
1542 return worker_request (mono_domain_get ());
1545 MonoBoolean G_GNUC_UNUSED
1546 ves_icall_System_Threading_ThreadPool_PostQueuedCompletionStatus (MonoNativeOverlapped *native_overlapped)
1548 /* This copy the behavior of the current Mono implementation */
1549 mono_raise_exception (mono_get_exception_not_implemented (NULL));
1553 MonoBoolean G_GNUC_UNUSED
1554 ves_icall_System_Threading_ThreadPool_BindIOCompletionCallbackNative (gpointer file_handle)
1556 /* This copy the behavior of the current Mono implementation */
1560 MonoBoolean G_GNUC_UNUSED
1561 ves_icall_System_Threading_ThreadPool_IsThreadPoolHosted (void)