-/*
- * threadpool-ms.c: Microsoft threadpool runtime support
- *
- * Author:
- * Ludovic Henry (ludovic.henry@xamarin.com)
- *
- * Copyright 2015 Xamarin, Inc (http://www.xamarin.com)
- * Licensed under the MIT license. See LICENSE file in the project root for full license information.
- */
-
-//
-// Copyright (c) Microsoft. All rights reserved.
-// Licensed under the MIT license. See LICENSE file in the project root for full license information.
-//
-// Files:
-// - src/vm/comthreadpool.cpp
-// - src/vm/win32threadpoolcpp
-// - src/vm/threadpoolrequest.cpp
-// - src/vm/hillclimbing.cpp
-//
-// Ported from C++ to C and adjusted to Mono runtime
-
-#include <stdlib.h>
-#define _USE_MATH_DEFINES // needed by MSVC to define math constants
-#include <math.h>
-#include <config.h>
-#include <glib.h>
-
-#include <mono/metadata/class-internals.h>
-#include <mono/metadata/exception.h>
-#include <mono/metadata/gc-internals.h>
-#include <mono/metadata/object.h>
-#include <mono/metadata/object-internals.h>
-#include <mono/metadata/threadpool-ms.h>
-#include <mono/metadata/threadpool-ms-io.h>
-#include <mono/metadata/w32event.h>
-#include <mono/utils/atomic.h>
-#include <mono/utils/mono-compiler.h>
-#include <mono/utils/mono-complex.h>
-#include <mono/utils/mono-lazy-init.h>
-#include <mono/utils/mono-logger.h>
-#include <mono/utils/mono-logger-internals.h>
-#include <mono/utils/mono-proclib.h>
-#include <mono/utils/mono-threads.h>
-#include <mono/utils/mono-time.h>
-#include <mono/utils/mono-rand.h>
-#include <mono/io-layer/io-layer.h>
-
-#define CPU_USAGE_LOW 80
-#define CPU_USAGE_HIGH 95
-
-#define MONITOR_INTERVAL 500 // ms
-#define MONITOR_MINIMAL_LIFETIME 60 * 1000 // ms
-
-#define WORKER_CREATION_MAX_PER_SEC 10
-
-/* The exponent to apply to the gain. 1.0 means to use linear gain,
- * higher values will enhance large moves and damp small ones.
- * default: 2.0 */
-#define HILL_CLIMBING_GAIN_EXPONENT 2.0
-
-/* The 'cost' of a thread. 0 means drive for increased throughput regardless
- * of thread count, higher values bias more against higher thread counts.
- * default: 0.15 */
-#define HILL_CLIMBING_BIAS 0.15
-
-#define HILL_CLIMBING_WAVE_PERIOD 4
-#define HILL_CLIMBING_MAX_WAVE_MAGNITUDE 20
-#define HILL_CLIMBING_WAVE_MAGNITUDE_MULTIPLIER 1.0
-#define HILL_CLIMBING_WAVE_HISTORY_SIZE 8
-#define HILL_CLIMBING_TARGET_SIGNAL_TO_NOISE_RATIO 3.0
-#define HILL_CLIMBING_MAX_CHANGE_PER_SECOND 4
-#define HILL_CLIMBING_MAX_CHANGE_PER_SAMPLE 20
-#define HILL_CLIMBING_SAMPLE_INTERVAL_LOW 10
-#define HILL_CLIMBING_SAMPLE_INTERVAL_HIGH 200
-#define HILL_CLIMBING_ERROR_SMOOTHING_FACTOR 0.01
-#define HILL_CLIMBING_MAX_SAMPLE_ERROR_PERCENT 0.15
-
-typedef union {
- struct {
- gint16 max_working; /* determined by heuristic */
- gint16 active; /* executing worker_thread */
- gint16 working; /* actively executing worker_thread, not parked */
- gint16 parked; /* parked */
- } _;
- gint64 as_gint64;
-} ThreadPoolCounter;
-
-typedef struct {
- MonoDomain *domain;
- /* Number of outstanding jobs */
- gint32 outstanding_request;
- /* Number of currently executing jobs */
- int threadpool_jobs;
- /* Signalled when threadpool_jobs + outstanding_request is 0 */
- /* Protected by threadpool->domains_lock */
- MonoCoopCond cleanup_cond;
-} ThreadPoolDomain;
-
-typedef MonoInternalThread ThreadPoolWorkingThread;
-
-typedef struct {
- gint32 wave_period;
- gint32 samples_to_measure;
- gdouble target_throughput_ratio;
- gdouble target_signal_to_noise_ratio;
- gdouble max_change_per_second;
- gdouble max_change_per_sample;
- gint32 max_thread_wave_magnitude;
- gint32 sample_interval_low;
- gdouble thread_magnitude_multiplier;
- gint32 sample_interval_high;
- gdouble throughput_error_smoothing_factor;
- gdouble gain_exponent;
- gdouble max_sample_error;
-
- gdouble current_control_setting;
- gint64 total_samples;
- gint16 last_thread_count;
- gdouble elapsed_since_last_change;
- gdouble completions_since_last_change;
-
- gdouble average_throughput_noise;
-
- gdouble *samples;
- gdouble *thread_counts;
-
- guint32 current_sample_interval;
- gpointer random_interval_generator;
-
- gint32 accumulated_completion_count;
- gdouble accumulated_sample_duration;
-} ThreadPoolHillClimbing;
-
-typedef struct {
- ThreadPoolCounter counters;
-
- GPtrArray *domains; // ThreadPoolDomain* []
- MonoCoopMutex domains_lock;
-
- GPtrArray *working_threads; // ThreadPoolWorkingThread* []
- gint32 parked_threads_count;
- MonoCoopCond parked_threads_cond;
- MonoCoopMutex active_threads_lock; /* protect access to working_threads and parked_threads */
-
- guint32 worker_creation_current_second;
- guint32 worker_creation_current_count;
- MonoCoopMutex worker_creation_lock;
-
- gint32 heuristic_completions;
- gint64 heuristic_sample_start;
- gint64 heuristic_last_dequeue; // ms
- gint64 heuristic_last_adjustment; // ms
- gint64 heuristic_adjustment_interval; // ms
- ThreadPoolHillClimbing heuristic_hill_climbing;
- MonoCoopMutex heuristic_lock;
-
- gint32 limit_worker_min;
- gint32 limit_worker_max;
- gint32 limit_io_min;
- gint32 limit_io_max;
-
- MonoCpuUsageState *cpu_usage_state;
- gint32 cpu_usage;
-
- /* suspended by the debugger */
- gboolean suspended;
-} ThreadPool;
-
-typedef enum {
- TRANSITION_WARMUP,
- TRANSITION_INITIALIZING,
- TRANSITION_RANDOM_MOVE,
- TRANSITION_CLIMBING_MOVE,
- TRANSITION_CHANGE_POINT,
- TRANSITION_STABILIZING,
- TRANSITION_STARVATION,
- TRANSITION_THREAD_TIMED_OUT,
- TRANSITION_UNDEFINED,
-} ThreadPoolHeuristicStateTransition;
-
-static mono_lazy_init_t status = MONO_LAZY_INIT_STATUS_NOT_INITIALIZED;
-
-enum {
- MONITOR_STATUS_REQUESTED,
- MONITOR_STATUS_WAITING_FOR_REQUEST,
- MONITOR_STATUS_NOT_RUNNING,
-};
-
-static gint32 monitor_status = MONITOR_STATUS_NOT_RUNNING;
-
-static ThreadPool* threadpool;
-
-#define COUNTER_CHECK(counter) \
- do { \
- g_assert (counter._.max_working > 0); \
- g_assert (counter._.working >= 0); \
- g_assert (counter._.active >= 0); \
- } while (0)
-
-#define COUNTER_READ() (InterlockedRead64 (&threadpool->counters.as_gint64))
-
-#define COUNTER_ATOMIC(var,block) \
- do { \
- ThreadPoolCounter __old; \
- do { \
- g_assert (threadpool); \
- __old.as_gint64 = COUNTER_READ (); \
- (var) = __old; \
- { block; } \
- COUNTER_CHECK (var); \
- } while (InterlockedCompareExchange64 (&threadpool->counters.as_gint64, (var).as_gint64, __old.as_gint64) != __old.as_gint64); \
- } while (0)
-
-#define COUNTER_TRY_ATOMIC(res,var,block) \
- do { \
- ThreadPoolCounter __old; \
- do { \
- g_assert (threadpool); \
- __old.as_gint64 = COUNTER_READ (); \
- (var) = __old; \
- (res) = FALSE; \
- { block; } \
- COUNTER_CHECK (var); \
- (res) = InterlockedCompareExchange64 (&threadpool->counters.as_gint64, (var).as_gint64, __old.as_gint64) == __old.as_gint64; \
- } while (0); \
- } while (0)
-
-static inline void
-domains_lock (void)
-{
- mono_coop_mutex_lock (&threadpool->domains_lock);
-}
-
-static inline void
-domains_unlock (void)
-{
- mono_coop_mutex_unlock (&threadpool->domains_lock);
-}
-
-static gpointer
-rand_create (void)
-{
- mono_rand_open ();
- return mono_rand_init (NULL, 0);
-}
-
-static guint32
-rand_next (gpointer *handle, guint32 min, guint32 max)
-{
- MonoError error;
- guint32 val;
- mono_rand_try_get_uint32 (handle, &val, min, max, &error);
- // FIXME handle error
- mono_error_assert_ok (&error);
- return val;
-}
-
-static void
-rand_free (gpointer handle)
-{
- mono_rand_close (handle);
-}
-
-static void
-initialize (void)
-{
- ThreadPoolHillClimbing *hc;
- const char *threads_per_cpu_env;
- gint threads_per_cpu;
- gint threads_count;
-
- g_assert (!threadpool);
- threadpool = g_new0 (ThreadPool, 1);
- g_assert (threadpool);
-
- threadpool->domains = g_ptr_array_new ();
- mono_coop_mutex_init (&threadpool->domains_lock);
-
- threadpool->parked_threads_count = 0;
- mono_coop_cond_init (&threadpool->parked_threads_cond);
- threadpool->working_threads = g_ptr_array_new ();
- mono_coop_mutex_init (&threadpool->active_threads_lock);
-
- threadpool->worker_creation_current_second = -1;
- mono_coop_mutex_init (&threadpool->worker_creation_lock);
-
- threadpool->heuristic_adjustment_interval = 10;
- mono_coop_mutex_init (&threadpool->heuristic_lock);
-
- mono_rand_open ();
-
- hc = &threadpool->heuristic_hill_climbing;
-
- hc->wave_period = HILL_CLIMBING_WAVE_PERIOD;
- hc->max_thread_wave_magnitude = HILL_CLIMBING_MAX_WAVE_MAGNITUDE;
- hc->thread_magnitude_multiplier = (gdouble) HILL_CLIMBING_WAVE_MAGNITUDE_MULTIPLIER;
- hc->samples_to_measure = hc->wave_period * HILL_CLIMBING_WAVE_HISTORY_SIZE;
- hc->target_throughput_ratio = (gdouble) HILL_CLIMBING_BIAS;
- hc->target_signal_to_noise_ratio = (gdouble) HILL_CLIMBING_TARGET_SIGNAL_TO_NOISE_RATIO;
- hc->max_change_per_second = (gdouble) HILL_CLIMBING_MAX_CHANGE_PER_SECOND;
- hc->max_change_per_sample = (gdouble) HILL_CLIMBING_MAX_CHANGE_PER_SAMPLE;
- hc->sample_interval_low = HILL_CLIMBING_SAMPLE_INTERVAL_LOW;
- hc->sample_interval_high = HILL_CLIMBING_SAMPLE_INTERVAL_HIGH;
- hc->throughput_error_smoothing_factor = (gdouble) HILL_CLIMBING_ERROR_SMOOTHING_FACTOR;
- hc->gain_exponent = (gdouble) HILL_CLIMBING_GAIN_EXPONENT;
- hc->max_sample_error = (gdouble) HILL_CLIMBING_MAX_SAMPLE_ERROR_PERCENT;
- hc->current_control_setting = 0;
- hc->total_samples = 0;
- hc->last_thread_count = 0;
- hc->average_throughput_noise = 0;
- hc->elapsed_since_last_change = 0;
- hc->accumulated_completion_count = 0;
- hc->accumulated_sample_duration = 0;
- hc->samples = g_new0 (gdouble, hc->samples_to_measure);
- hc->thread_counts = g_new0 (gdouble, hc->samples_to_measure);
- hc->random_interval_generator = rand_create ();
- hc->current_sample_interval = rand_next (&hc->random_interval_generator, hc->sample_interval_low, hc->sample_interval_high);
-
- if (!(threads_per_cpu_env = g_getenv ("MONO_THREADS_PER_CPU")))
- threads_per_cpu = 1;
- else
- threads_per_cpu = CLAMP (atoi (threads_per_cpu_env), 1, 50);
-
- threads_count = mono_cpu_count () * threads_per_cpu;
-
- threadpool->limit_worker_min = threadpool->limit_io_min = threads_count;
-
-#if defined (PLATFORM_ANDROID) || defined (HOST_IOS)
- threadpool->limit_worker_max = threadpool->limit_io_max = CLAMP (threads_count * 100, MIN (threads_count, 200), MAX (threads_count, 200));
-#else
- threadpool->limit_worker_max = threadpool->limit_io_max = threads_count * 100;
-#endif
-
- threadpool->counters._.max_working = threadpool->limit_worker_min;
-
- threadpool->cpu_usage_state = g_new0 (MonoCpuUsageState, 1);
-
- threadpool->suspended = FALSE;
-}
-
-static void worker_kill (ThreadPoolWorkingThread *thread);
-
-static void
-cleanup (void)
-{
- guint i;
-
- /* we make the assumption along the code that we are
- * cleaning up only if the runtime is shutting down */
- g_assert (mono_runtime_is_shutting_down ());
-
- while (monitor_status != MONITOR_STATUS_NOT_RUNNING)
- mono_thread_info_sleep (1, NULL);
-
- mono_coop_mutex_lock (&threadpool->active_threads_lock);
-
- /* stop all threadpool->working_threads */
- for (i = 0; i < threadpool->working_threads->len; ++i)
- worker_kill ((ThreadPoolWorkingThread*) g_ptr_array_index (threadpool->working_threads, i));
-
- /* unpark all threadpool->parked_threads */
- mono_coop_cond_broadcast (&threadpool->parked_threads_cond);
-
- mono_coop_mutex_unlock (&threadpool->active_threads_lock);
-}
-
-gboolean
-mono_threadpool_ms_enqueue_work_item (MonoDomain *domain, MonoObject *work_item, MonoError *error)
-{
- static MonoClass *threadpool_class = NULL;
- static MonoMethod *unsafe_queue_custom_work_item_method = NULL;
- MonoDomain *current_domain;
- MonoBoolean f;
- gpointer args [2];
-
- mono_error_init (error);
- g_assert (work_item);
-
- if (!threadpool_class)
- threadpool_class = mono_class_load_from_name (mono_defaults.corlib, "System.Threading", "ThreadPool");
-
- if (!unsafe_queue_custom_work_item_method)
- unsafe_queue_custom_work_item_method = mono_class_get_method_from_name (threadpool_class, "UnsafeQueueCustomWorkItem", 2);
- g_assert (unsafe_queue_custom_work_item_method);
-
- f = FALSE;
-
- args [0] = (gpointer) work_item;
- args [1] = (gpointer) &f;
-
- current_domain = mono_domain_get ();
- if (current_domain == domain) {
- mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
- return_val_if_nok (error, FALSE);
- } else {
- mono_thread_push_appdomain_ref (domain);
- if (mono_domain_set (domain, FALSE)) {
- mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
- if (!is_ok (error)) {
- mono_thread_pop_appdomain_ref ();
- return FALSE;
- }
- mono_domain_set (current_domain, TRUE);
- }
- mono_thread_pop_appdomain_ref ();
- }
- return TRUE;
-}
-
-/* LOCKING: domains_lock must be held */
-static void
-tpdomain_add (ThreadPoolDomain *tpdomain)
-{
- guint i, len;
-
- g_assert (tpdomain);
-
- len = threadpool->domains->len;
- for (i = 0; i < len; ++i) {
- if (g_ptr_array_index (threadpool->domains, i) == tpdomain)
- break;
- }
-
- if (i == len)
- g_ptr_array_add (threadpool->domains, tpdomain);
-}
-
-/* LOCKING: domains_lock must be held. */
-static gboolean
-tpdomain_remove (ThreadPoolDomain *tpdomain)
-{
- g_assert (tpdomain);
- return g_ptr_array_remove (threadpool->domains, tpdomain);
-}
-
-/* LOCKING: domains_lock must be held */
-static ThreadPoolDomain *
-tpdomain_get (MonoDomain *domain, gboolean create)
-{
- guint i;
- ThreadPoolDomain *tpdomain;
-
- g_assert (domain);
-
- for (i = 0; i < threadpool->domains->len; ++i) {
- ThreadPoolDomain *tpdomain;
-
- tpdomain = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i);
- if (tpdomain->domain == domain)
- return tpdomain;
- }
-
- if (!create)
- return NULL;
-
- tpdomain = g_new0 (ThreadPoolDomain, 1);
- tpdomain->domain = domain;
- mono_coop_cond_init (&tpdomain->cleanup_cond);
-
- tpdomain_add (tpdomain);
-
- return tpdomain;
-}
-
-static void
-tpdomain_free (ThreadPoolDomain *tpdomain)
-{
- g_free (tpdomain);
-}
-
-/* LOCKING: domains_lock must be held */
-static gboolean
-domain_any_has_request (void)
-{
- guint i;
-
- for (i = 0; i < threadpool->domains->len; ++i) {
- ThreadPoolDomain *tmp = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i);
- if (tmp->outstanding_request > 0)
- return TRUE;
- }
-
- return FALSE;
-}
-
-/* LOCKING: domains_lock must be held */
-static ThreadPoolDomain *
-tpdomain_get_next (ThreadPoolDomain *current)
-{
- ThreadPoolDomain *tpdomain = NULL;
- guint len;
-
- len = threadpool->domains->len;
- if (len > 0) {
- guint i, current_idx = -1;
- if (current) {
- for (i = 0; i < len; ++i) {
- if (current == g_ptr_array_index (threadpool->domains, i)) {
- current_idx = i;
- break;
- }
- }
- g_assert (current_idx != (guint)-1);
- }
- for (i = current_idx + 1; i < len + current_idx + 1; ++i) {
- ThreadPoolDomain *tmp = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i % len);
- if (tmp->outstanding_request > 0) {
- tpdomain = tmp;
- break;
- }
- }
- }
-
- return tpdomain;
-}
-
-static void
-worker_wait_interrupt (gpointer data)
-{
- mono_coop_mutex_lock (&threadpool->active_threads_lock);
- mono_coop_cond_signal (&threadpool->parked_threads_cond);
- mono_coop_mutex_unlock (&threadpool->active_threads_lock);
-}
-
-/* return TRUE if timeout, FALSE otherwise (worker unpark or interrupt) */
-static gboolean
-worker_park (void)
-{
- gboolean timeout = FALSE;
-
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] current worker parking", mono_native_thread_id_get ());
-
- mono_gc_set_skip_thread (TRUE);
-
- mono_coop_mutex_lock (&threadpool->active_threads_lock);
-
- if (!mono_runtime_is_shutting_down ()) {
- static gpointer rand_handle = NULL;
- MonoInternalThread *thread_internal;
- gboolean interrupted = FALSE;
-
- if (!rand_handle)
- rand_handle = rand_create ();
- g_assert (rand_handle);
-
- thread_internal = mono_thread_internal_current ();
- g_assert (thread_internal);
-
- threadpool->parked_threads_count += 1;
- g_ptr_array_remove_fast (threadpool->working_threads, thread_internal);
-
- mono_thread_info_install_interrupt (worker_wait_interrupt, NULL, &interrupted);
- if (interrupted)
- goto done;
-
- if (mono_coop_cond_timedwait (&threadpool->parked_threads_cond, &threadpool->active_threads_lock, rand_next (&rand_handle, 5 * 1000, 60 * 1000)) != 0)
- timeout = TRUE;
-
- mono_thread_info_uninstall_interrupt (&interrupted);
-
-done:
- g_ptr_array_add (threadpool->working_threads, thread_internal);
- threadpool->parked_threads_count -= 1;
- }
-
- mono_coop_mutex_unlock (&threadpool->active_threads_lock);
-
- mono_gc_set_skip_thread (FALSE);
-
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] current worker unparking, timeout? %s", mono_native_thread_id_get (), timeout ? "yes" : "no");
-
- return timeout;
-}
-
-static gboolean
-worker_try_unpark (void)
-{
- gboolean res = FALSE;
-
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try unpark worker", mono_native_thread_id_get ());
-
- mono_coop_mutex_lock (&threadpool->active_threads_lock);
- if (threadpool->parked_threads_count > 0) {
- mono_coop_cond_signal (&threadpool->parked_threads_cond);
- res = TRUE;
- }
- mono_coop_mutex_unlock (&threadpool->active_threads_lock);
-
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try unpark worker, success? %s", mono_native_thread_id_get (), res ? "yes" : "no");
-
- return res;
-}
-
-static void
-worker_kill (ThreadPoolWorkingThread *thread)
-{
- if (thread == mono_thread_internal_current ())
- return;
-
- mono_thread_internal_abort ((MonoInternalThread*) thread);
-}
-
-static void
-worker_thread (gpointer data)
-{
- MonoError error;
- MonoInternalThread *thread;
- ThreadPoolDomain *tpdomain, *previous_tpdomain;
- ThreadPoolCounter counter;
- gboolean retire = FALSE;
-
- mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_THREADPOOL, "[%p] worker starting", mono_native_thread_id_get ());
-
- g_assert (threadpool);
-
- thread = mono_thread_internal_current ();
- g_assert (thread);
-
- mono_thread_set_name_internal (thread, mono_string_new (mono_get_root_domain (), "Threadpool worker"), FALSE, &error);
- mono_error_assert_ok (&error);
-
- mono_coop_mutex_lock (&threadpool->active_threads_lock);
- g_ptr_array_add (threadpool->working_threads, thread);
- mono_coop_mutex_unlock (&threadpool->active_threads_lock);
-
- previous_tpdomain = NULL;
-
- domains_lock ();
-
- while (!mono_runtime_is_shutting_down ()) {
- tpdomain = NULL;
-
- if ((thread->state & (ThreadState_AbortRequested | ThreadState_SuspendRequested)) != 0) {
- domains_unlock ();
- mono_thread_interruption_checkpoint ();
- domains_lock ();
- }
-
- if (retire || !(tpdomain = tpdomain_get_next (previous_tpdomain))) {
- gboolean timeout;
-
- COUNTER_ATOMIC (counter, {
- counter._.working --;
- counter._.parked ++;
- });
-
- domains_unlock ();
- timeout = worker_park ();
- domains_lock ();
-
- COUNTER_ATOMIC (counter, {
- counter._.working ++;
- counter._.parked --;
- });
-
- if (timeout)
- break;
-
- if (retire)
- retire = FALSE;
-
- /* The tpdomain->domain might have unloaded, while this thread was parked */
- previous_tpdomain = NULL;
-
- continue;
- }
-
- tpdomain->outstanding_request --;
- g_assert (tpdomain->outstanding_request >= 0);
-
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] worker running in domain %p (outstanding requests %d) ",
- mono_native_thread_id_get (), tpdomain->domain, tpdomain->outstanding_request);
-
- g_assert (tpdomain->domain);
- g_assert (tpdomain->threadpool_jobs >= 0);
- tpdomain->threadpool_jobs ++;
-
- /*
- * This is needed so there is always an lmf frame in the runtime invoke call below,
- * so ThreadAbortExceptions are caught even if the thread is in native code.
- */
- mono_defaults.threadpool_perform_wait_callback_method->save_lmf = TRUE;
-
- domains_unlock ();
-
- mono_thread_push_appdomain_ref (tpdomain->domain);
- if (mono_domain_set (tpdomain->domain, FALSE)) {
- MonoObject *exc = NULL, *res;
-
- res = mono_runtime_try_invoke (mono_defaults.threadpool_perform_wait_callback_method, NULL, NULL, &exc, &error);
- if (exc || !mono_error_ok(&error)) {
- if (exc == NULL)
- exc = (MonoObject *) mono_error_convert_to_exception (&error);
- else
- mono_error_cleanup (&error);
- mono_thread_internal_unhandled_exception (exc);
- } else if (res && *(MonoBoolean*) mono_object_unbox (res) == FALSE)
- retire = TRUE;
-
- mono_thread_clr_state (thread, (MonoThreadState)~ThreadState_Background);
- if (!mono_thread_test_state (thread , ThreadState_Background))
- ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background);
-
- mono_domain_set (mono_get_root_domain (), TRUE);
- }
- mono_thread_pop_appdomain_ref ();
-
- domains_lock ();
-
- tpdomain->threadpool_jobs --;
- g_assert (tpdomain->threadpool_jobs >= 0);
-
- if (tpdomain->outstanding_request + tpdomain->threadpool_jobs == 0 && mono_domain_is_unloading (tpdomain->domain)) {
- gboolean removed;
-
- removed = tpdomain_remove (tpdomain);
- g_assert (removed);
-
- mono_coop_cond_signal (&tpdomain->cleanup_cond);
- tpdomain = NULL;
- }
-
- previous_tpdomain = tpdomain;
- }
-
- domains_unlock ();
-
- mono_coop_mutex_lock (&threadpool->active_threads_lock);
- g_ptr_array_remove_fast (threadpool->working_threads, thread);
- mono_coop_mutex_unlock (&threadpool->active_threads_lock);
-
- COUNTER_ATOMIC (counter, {
- counter._.working--;
- counter._.active --;
- });
-
- mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_THREADPOOL, "[%p] worker finishing", mono_native_thread_id_get ());
-}
-
-static gboolean
-worker_try_create (void)
-{
- ThreadPoolCounter counter;
- MonoInternalThread *thread;
- gint64 current_ticks;
- gint32 now;
-
- mono_coop_mutex_lock (&threadpool->worker_creation_lock);
-
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try create worker", mono_native_thread_id_get ());
- current_ticks = mono_100ns_ticks ();
- now = current_ticks / (10 * 1000 * 1000);
- if (0 == current_ticks) {
- g_warning ("failed to get 100ns ticks");
- } else {
- if (threadpool->worker_creation_current_second != now) {
- threadpool->worker_creation_current_second = now;
- threadpool->worker_creation_current_count = 0;
- } else {
- g_assert (threadpool->worker_creation_current_count <= WORKER_CREATION_MAX_PER_SEC);
- if (threadpool->worker_creation_current_count == WORKER_CREATION_MAX_PER_SEC) {
- 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",
- mono_native_thread_id_get (), threadpool->worker_creation_current_count);
- mono_coop_mutex_unlock (&threadpool->worker_creation_lock);
- return FALSE;
- }
- }
- }
-
- COUNTER_ATOMIC (counter, {
- if (counter._.working >= counter._.max_working) {
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try create worker, failed: maximum number of working threads reached",
- mono_native_thread_id_get ());
- mono_coop_mutex_unlock (&threadpool->worker_creation_lock);
- return FALSE;
- }
- counter._.working ++;
- counter._.active ++;
- });
-
- MonoError error;
- if ((thread = mono_thread_create_internal (mono_get_root_domain (), worker_thread, NULL, TRUE, 0, &error)) != NULL) {
- threadpool->worker_creation_current_count += 1;
-
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try create worker, created %p, now = %d count = %d", mono_native_thread_id_get (), GUINT_TO_POINTER(thread->tid), now, threadpool->worker_creation_current_count);
- mono_coop_mutex_unlock (&threadpool->worker_creation_lock);
- return TRUE;
- }
-
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] try create worker, failed: could not create thread due to %s", mono_native_thread_id_get (), mono_error_get_message (&error));
- mono_error_cleanup (&error);
-
- COUNTER_ATOMIC (counter, {
- counter._.working --;
- counter._.active --;
- });
-
- mono_coop_mutex_unlock (&threadpool->worker_creation_lock);
- return FALSE;
-}
-
-static void monitor_ensure_running (void);
-
-static gboolean
-worker_request (MonoDomain *domain)
-{
- ThreadPoolDomain *tpdomain;
-
- g_assert (domain);
- g_assert (threadpool);
-
- if (mono_runtime_is_shutting_down ())
- return FALSE;
-
- domains_lock ();
-
- /* synchronize check with worker_thread */
- if (mono_domain_is_unloading (domain)) {
- domains_unlock ();
- return FALSE;
- }
-
- tpdomain = tpdomain_get (domain, TRUE);
- g_assert (tpdomain);
- tpdomain->outstanding_request ++;
-
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, domain = %p, outstanding_request = %d",
- mono_native_thread_id_get (), tpdomain->domain, tpdomain->outstanding_request);
-
- domains_unlock ();
-
- if (threadpool->suspended)
- return FALSE;
-
- monitor_ensure_running ();
-
- if (worker_try_unpark ()) {
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, unparked", mono_native_thread_id_get ());
- return TRUE;
- }
-
- if (worker_try_create ()) {
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, created", mono_native_thread_id_get ());
- return TRUE;
- }
-
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] request worker, failed", mono_native_thread_id_get ());
- return FALSE;
-}
-
-static gboolean
-monitor_should_keep_running (void)
-{
- static gint64 last_should_keep_running = -1;
-
- g_assert (monitor_status == MONITOR_STATUS_WAITING_FOR_REQUEST || monitor_status == MONITOR_STATUS_REQUESTED);
-
- if (InterlockedExchange (&monitor_status, MONITOR_STATUS_WAITING_FOR_REQUEST) == MONITOR_STATUS_WAITING_FOR_REQUEST) {
- gboolean should_keep_running = TRUE, force_should_keep_running = FALSE;
-
- if (mono_runtime_is_shutting_down ()) {
- should_keep_running = FALSE;
- } else {
- domains_lock ();
- if (!domain_any_has_request ())
- should_keep_running = FALSE;
- domains_unlock ();
-
- if (!should_keep_running) {
- if (last_should_keep_running == -1 || mono_100ns_ticks () - last_should_keep_running < MONITOR_MINIMAL_LIFETIME * 1000 * 10) {
- should_keep_running = force_should_keep_running = TRUE;
- }
- }
- }
-
- if (should_keep_running) {
- if (last_should_keep_running == -1 || !force_should_keep_running)
- last_should_keep_running = mono_100ns_ticks ();
- } else {
- last_should_keep_running = -1;
- if (InterlockedCompareExchange (&monitor_status, MONITOR_STATUS_NOT_RUNNING, MONITOR_STATUS_WAITING_FOR_REQUEST) == MONITOR_STATUS_WAITING_FOR_REQUEST)
- return FALSE;
- }
- }
-
- g_assert (monitor_status == MONITOR_STATUS_WAITING_FOR_REQUEST || monitor_status == MONITOR_STATUS_REQUESTED);
-
- return TRUE;
-}
-
-static gboolean
-monitor_sufficient_delay_since_last_dequeue (void)
-{
- gint64 threshold;
-
- g_assert (threadpool);
-
- if (threadpool->cpu_usage < CPU_USAGE_LOW) {
- threshold = MONITOR_INTERVAL;
- } else {
- ThreadPoolCounter counter;
- counter.as_gint64 = COUNTER_READ();
- threshold = counter._.max_working * MONITOR_INTERVAL * 2;
- }
-
- return mono_msec_ticks () >= threadpool->heuristic_last_dequeue + threshold;
-}
-
-static void hill_climbing_force_change (gint16 new_thread_count, ThreadPoolHeuristicStateTransition transition);
-
-static void
-monitor_thread (void)
-{
- MonoInternalThread *current_thread = mono_thread_internal_current ();
- guint i;
-
- mono_cpu_usage (threadpool->cpu_usage_state);
-
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, started", mono_native_thread_id_get ());
-
- do {
- ThreadPoolCounter counter;
- gboolean limit_worker_max_reached;
- gint32 interval_left = MONITOR_INTERVAL;
- gint32 awake = 0; /* number of spurious awakes we tolerate before doing a round of rebalancing */
-
- g_assert (monitor_status != MONITOR_STATUS_NOT_RUNNING);
-
- mono_gc_set_skip_thread (TRUE);
-
- do {
- gint64 ts;
- gboolean alerted = FALSE;
-
- if (mono_runtime_is_shutting_down ())
- break;
-
- ts = mono_msec_ticks ();
- if (mono_thread_info_sleep (interval_left, &alerted) == 0)
- break;
- interval_left -= mono_msec_ticks () - ts;
-
- mono_gc_set_skip_thread (FALSE);
- if ((current_thread->state & (ThreadState_StopRequested | ThreadState_SuspendRequested)) != 0)
- mono_thread_interruption_checkpoint ();
- mono_gc_set_skip_thread (TRUE);
- } while (interval_left > 0 && ++awake < 10);
-
- mono_gc_set_skip_thread (FALSE);
-
- if (threadpool->suspended)
- continue;
-
- if (mono_runtime_is_shutting_down ())
- continue;
-
- domains_lock ();
- if (!domain_any_has_request ()) {
- domains_unlock ();
- continue;
- }
- domains_unlock ();
-
- threadpool->cpu_usage = mono_cpu_usage (threadpool->cpu_usage_state);
-
- if (!monitor_sufficient_delay_since_last_dequeue ())
- continue;
-
- limit_worker_max_reached = FALSE;
-
- COUNTER_ATOMIC (counter, {
- if (counter._.max_working >= threadpool->limit_worker_max) {
- limit_worker_max_reached = TRUE;
- break;
- }
- counter._.max_working ++;
- });
-
- if (limit_worker_max_reached)
- continue;
-
- hill_climbing_force_change (counter._.max_working, TRANSITION_STARVATION);
-
- for (i = 0; i < 5; ++i) {
- if (mono_runtime_is_shutting_down ())
- break;
-
- if (worker_try_unpark ()) {
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, unparked", mono_native_thread_id_get ());
- break;
- }
-
- if (worker_try_create ()) {
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, created", mono_native_thread_id_get ());
- break;
- }
- }
- } while (monitor_should_keep_running ());
-
- mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] monitor thread, finished", mono_native_thread_id_get ());
-}
-
-static void
-monitor_ensure_running (void)
-{
- MonoError error;
- for (;;) {
- switch (monitor_status) {
- case MONITOR_STATUS_REQUESTED:
- return;
- case MONITOR_STATUS_WAITING_FOR_REQUEST:
- InterlockedCompareExchange (&monitor_status, MONITOR_STATUS_REQUESTED, MONITOR_STATUS_WAITING_FOR_REQUEST);
- break;
- case MONITOR_STATUS_NOT_RUNNING:
- if (mono_runtime_is_shutting_down ())
- return;
- if (InterlockedCompareExchange (&monitor_status, MONITOR_STATUS_REQUESTED, MONITOR_STATUS_NOT_RUNNING) == MONITOR_STATUS_NOT_RUNNING) {
- if (!mono_thread_create_internal (mono_get_root_domain (), monitor_thread, NULL, TRUE, SMALL_STACK, &error)) {
- monitor_status = MONITOR_STATUS_NOT_RUNNING;
- mono_error_cleanup (&error);
- }
- return;
- }
- break;
- default: g_assert_not_reached ();
- }
- }
-}
-
-static void
-hill_climbing_change_thread_count (gint16 new_thread_count, ThreadPoolHeuristicStateTransition transition)
-{
- ThreadPoolHillClimbing *hc;
-
- g_assert (threadpool);
-
- hc = &threadpool->heuristic_hill_climbing;
-
- 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);
-
- hc->last_thread_count = new_thread_count;
- hc->current_sample_interval = rand_next (&hc->random_interval_generator, hc->sample_interval_low, hc->sample_interval_high);
- hc->elapsed_since_last_change = 0;
- hc->completions_since_last_change = 0;
-}
-
-static void
-hill_climbing_force_change (gint16 new_thread_count, ThreadPoolHeuristicStateTransition transition)
-{
- ThreadPoolHillClimbing *hc;
-
- g_assert (threadpool);
-
- hc = &threadpool->heuristic_hill_climbing;
-
- if (new_thread_count != hc->last_thread_count) {
- hc->current_control_setting += new_thread_count - hc->last_thread_count;
- hill_climbing_change_thread_count (new_thread_count, transition);
- }
-}
-
-static double_complex
-hill_climbing_get_wave_component (gdouble *samples, guint sample_count, gdouble period)
-{
- ThreadPoolHillClimbing *hc;
- gdouble w, cosine, sine, coeff, q0, q1, q2;
- guint i;
-
- g_assert (threadpool);
- g_assert (sample_count >= period);
- g_assert (period >= 2);
-
- hc = &threadpool->heuristic_hill_climbing;
-
- w = 2.0 * M_PI / period;
- cosine = cos (w);
- sine = sin (w);
- coeff = 2.0 * cosine;
- q0 = q1 = q2 = 0;
-
- for (i = 0; i < sample_count; ++i) {
- q0 = coeff * q1 - q2 + samples [(hc->total_samples - sample_count + i) % hc->samples_to_measure];
- q2 = q1;
- q1 = q0;
- }
-
- return mono_double_complex_scalar_div (mono_double_complex_make (q1 - q2 * cosine, (q2 * sine)), ((gdouble)sample_count));
-}
-
-static gint16
-hill_climbing_update (gint16 current_thread_count, guint32 sample_duration, gint32 completions, gint64 *adjustment_interval)
-{
- ThreadPoolHillClimbing *hc;
- ThreadPoolHeuristicStateTransition transition;
- gdouble throughput;
- gdouble throughput_error_estimate;
- gdouble confidence;
- gdouble move;
- gdouble gain;
- gint sample_index;
- gint sample_count;
- gint new_thread_wave_magnitude;
- gint new_thread_count;
- double_complex thread_wave_component;
- double_complex throughput_wave_component;
- double_complex ratio;
-
- g_assert (threadpool);
- g_assert (adjustment_interval);
-
- hc = &threadpool->heuristic_hill_climbing;
-
- /* If someone changed the thread count without telling us, update our records accordingly. */
- if (current_thread_count != hc->last_thread_count)
- hill_climbing_force_change (current_thread_count, TRANSITION_INITIALIZING);
-
- /* Update the cumulative stats for this thread count */
- hc->elapsed_since_last_change += sample_duration;
- hc->completions_since_last_change += completions;
-
- /* Add in any data we've already collected about this sample */
- sample_duration += hc->accumulated_sample_duration;
- completions += hc->accumulated_completion_count;
-
- /* We need to make sure we're collecting reasonably accurate data. Since we're just counting the end
- * of each work item, we are goinng to be missing some data about what really happened during the
- * sample interval. The count produced by each thread includes an initial work item that may have
- * started well before the start of the interval, and each thread may have been running some new
- * work item for some time before the end of the interval, which did not yet get counted. So
- * our count is going to be off by +/- threadCount workitems.
- *
- * The exception is that the thread that reported to us last time definitely wasn't running any work
- * at that time, and the thread that's reporting now definitely isn't running a work item now. So
- * we really only need to consider threadCount-1 threads.
- *
- * Thus the percent error in our count is +/- (threadCount-1)/numCompletions.
- *
- * We cannot rely on the frequency-domain analysis we'll be doing later to filter out this error, because
- * of the way it accumulates over time. If this sample is off by, say, 33% in the negative direction,
- * then the next one likely will be too. The one after that will include the sum of the completions
- * we missed in the previous samples, and so will be 33% positive. So every three samples we'll have
- * two "low" samples and one "high" sample. This will appear as periodic variation right in the frequency
- * range we're targeting, which will not be filtered by the frequency-domain translation. */
- if (hc->total_samples > 0 && ((current_thread_count - 1.0) / completions) >= hc->max_sample_error) {
- /* Not accurate enough yet. Let's accumulate the data so
- * far, and tell the ThreadPool to collect a little more. */
- hc->accumulated_sample_duration = sample_duration;
- hc->accumulated_completion_count = completions;
- *adjustment_interval = 10;
- return current_thread_count;
- }
-
- /* We've got enouugh data for our sample; reset our accumulators for next time. */
- hc->accumulated_sample_duration = 0;
- hc->accumulated_completion_count = 0;
-
- /* Add the current thread count and throughput sample to our history. */
- throughput = ((gdouble) completions) / sample_duration;
-
- sample_index = hc->total_samples % hc->samples_to_measure;
- hc->samples [sample_index] = throughput;
- hc->thread_counts [sample_index] = current_thread_count;
- hc->total_samples ++;
-
- /* Set up defaults for our metrics. */
- thread_wave_component = mono_double_complex_make(0, 0);
- throughput_wave_component = mono_double_complex_make(0, 0);
- throughput_error_estimate = 0;
- ratio = mono_double_complex_make(0, 0);
- confidence = 0;
-
- transition = TRANSITION_WARMUP;
-
- /* How many samples will we use? It must be at least the three wave periods we're looking for, and it must also
- * be a whole multiple of the primary wave's period; otherwise the frequency we're looking for will fall between
- * two frequency bands in the Fourier analysis, and we won't be able to measure it accurately. */
- sample_count = ((gint) MIN (hc->total_samples - 1, hc->samples_to_measure) / hc->wave_period) * hc->wave_period;
-
- if (sample_count > hc->wave_period) {
- guint i;
- gdouble average_throughput;
- gdouble average_thread_count;
- gdouble sample_sum = 0;
- gdouble thread_sum = 0;
-
- /* Average the throughput and thread count samples, so we can scale the wave magnitudes later. */
- for (i = 0; i < sample_count; ++i) {
- guint j = (hc->total_samples - sample_count + i) % hc->samples_to_measure;
- sample_sum += hc->samples [j];
- thread_sum += hc->thread_counts [j];
- }
-
- average_throughput = sample_sum / sample_count;
- average_thread_count = thread_sum / sample_count;
-
- if (average_throughput > 0 && average_thread_count > 0) {
- gdouble noise_for_confidence, adjacent_period_1, adjacent_period_2;
-
- /* Calculate the periods of the adjacent frequency bands we'll be using to
- * measure noise levels. We want the two adjacent Fourier frequency bands. */
- adjacent_period_1 = sample_count / (((gdouble) sample_count) / ((gdouble) hc->wave_period) + 1);
- adjacent_period_2 = sample_count / (((gdouble) sample_count) / ((gdouble) hc->wave_period) - 1);
-
- /* Get the the three different frequency components of the throughput (scaled by average
- * throughput). Our "error" estimate (the amount of noise that might be present in the
- * frequency band we're really interested in) is the average of the adjacent bands. */
- throughput_wave_component = mono_double_complex_scalar_div (hill_climbing_get_wave_component (hc->samples, sample_count, hc->wave_period), average_throughput);
- throughput_error_estimate = cabs (mono_double_complex_scalar_div (hill_climbing_get_wave_component (hc->samples, sample_count, adjacent_period_1), average_throughput));
-
- if (adjacent_period_2 <= sample_count) {
- throughput_error_estimate = MAX (throughput_error_estimate, cabs (mono_double_complex_scalar_div (hill_climbing_get_wave_component (
- hc->samples, sample_count, adjacent_period_2), average_throughput)));
- }
-
- /* Do the same for the thread counts, so we have something to compare to. We don't
- * measure thread count noise, because there is none; these are exact measurements. */
- thread_wave_component = mono_double_complex_scalar_div (hill_climbing_get_wave_component (hc->thread_counts, sample_count, hc->wave_period), average_thread_count);
-
- /* Update our moving average of the throughput noise. We'll use this
- * later as feedback to determine the new size of the thread wave. */
- if (hc->average_throughput_noise == 0) {
- hc->average_throughput_noise = throughput_error_estimate;
- } else {
- hc->average_throughput_noise = (hc->throughput_error_smoothing_factor * throughput_error_estimate)
- + ((1.0 + hc->throughput_error_smoothing_factor) * hc->average_throughput_noise);
- }
-
- if (cabs (thread_wave_component) > 0) {
- /* Adjust the throughput wave so it's centered around the target wave,
- * and then calculate the adjusted throughput/thread ratio. */
- 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);
- transition = TRANSITION_CLIMBING_MOVE;
- } else {
- ratio = mono_double_complex_make (0, 0);
- transition = TRANSITION_STABILIZING;
- }
-
- noise_for_confidence = MAX (hc->average_throughput_noise, throughput_error_estimate);
- if (noise_for_confidence > 0) {
- confidence = cabs (thread_wave_component) / noise_for_confidence / hc->target_signal_to_noise_ratio;
- } else {
- /* there is no noise! */
- confidence = 1.0;
- }
- }
- }
-
- /* We use just the real part of the complex ratio we just calculated. If the throughput signal
- * is exactly in phase with the thread signal, this will be the same as taking the magnitude of
- * the complex move and moving that far up. If they're 180 degrees out of phase, we'll move
- * backward (because this indicates that our changes are having the opposite of the intended effect).
- * If they're 90 degrees out of phase, we won't move at all, because we can't tell wether we're
- * having a negative or positive effect on throughput. */
- move = creal (ratio);
- move = CLAMP (move, -1.0, 1.0);
-
- /* Apply our confidence multiplier. */
- move *= CLAMP (confidence, -1.0, 1.0);
-
- /* Now apply non-linear gain, such that values around zero are attenuated, while higher values
- * are enhanced. This allows us to move quickly if we're far away from the target, but more slowly
- * if we're getting close, giving us rapid ramp-up without wild oscillations around the target. */
- gain = hc->max_change_per_second * sample_duration;
- move = pow (fabs (move), hc->gain_exponent) * (move >= 0.0 ? 1 : -1) * gain;
- move = MIN (move, hc->max_change_per_sample);
-
- /* If the result was positive, and CPU is > 95%, refuse the move. */
- if (move > 0.0 && threadpool->cpu_usage > CPU_USAGE_HIGH)
- move = 0.0;
-
- /* Apply the move to our control setting. */
- hc->current_control_setting += move;
-
- /* Calculate the new thread wave magnitude, which is based on the moving average we've been keeping of the
- * throughput error. This average starts at zero, so we'll start with a nice safe little wave at first. */
- new_thread_wave_magnitude = (gint)(0.5 + (hc->current_control_setting * hc->average_throughput_noise
- * hc->target_signal_to_noise_ratio * hc->thread_magnitude_multiplier * 2.0));
- new_thread_wave_magnitude = CLAMP (new_thread_wave_magnitude, 1, hc->max_thread_wave_magnitude);
-
- /* Make sure our control setting is within the ThreadPool's limits. */
- hc->current_control_setting = CLAMP (hc->current_control_setting, threadpool->limit_worker_min, threadpool->limit_worker_max - new_thread_wave_magnitude);
-
- /* Calculate the new thread count (control setting + square wave). */
- new_thread_count = (gint)(hc->current_control_setting + new_thread_wave_magnitude * ((hc->total_samples / (hc->wave_period / 2)) % 2));
-
- /* Make sure the new thread count doesn't exceed the ThreadPool's limits. */
- new_thread_count = CLAMP (new_thread_count, threadpool->limit_worker_min, threadpool->limit_worker_max);
-
- if (new_thread_count != current_thread_count)
- hill_climbing_change_thread_count (new_thread_count, transition);
-
- if (creal (ratio) < 0.0 && new_thread_count == threadpool->limit_worker_min)
- *adjustment_interval = (gint)(0.5 + hc->current_sample_interval * (10.0 * MAX (-1.0 * creal (ratio), 1.0)));
- else
- *adjustment_interval = hc->current_sample_interval;
-
- return new_thread_count;
-}
-
-static void
-heuristic_notify_work_completed (void)
-{
- g_assert (threadpool);
-
- InterlockedIncrement (&threadpool->heuristic_completions);
- threadpool->heuristic_last_dequeue = mono_msec_ticks ();
-}
-
-static gboolean
-heuristic_should_adjust (void)
-{
- g_assert (threadpool);
-
- if (threadpool->heuristic_last_dequeue > threadpool->heuristic_last_adjustment + threadpool->heuristic_adjustment_interval) {
- ThreadPoolCounter counter;
- counter.as_gint64 = COUNTER_READ();
- if (counter._.working <= counter._.max_working)
- return TRUE;
- }
-
- return FALSE;
-}
-
-static void
-heuristic_adjust (void)
-{
- g_assert (threadpool);
-
- if (mono_coop_mutex_trylock (&threadpool->heuristic_lock) == 0) {
- gint32 completions = InterlockedExchange (&threadpool->heuristic_completions, 0);
- gint64 sample_end = mono_msec_ticks ();
- gint64 sample_duration = sample_end - threadpool->heuristic_sample_start;
-
- if (sample_duration >= threadpool->heuristic_adjustment_interval / 2) {
- ThreadPoolCounter counter;
- gint16 new_thread_count;
-
- counter.as_gint64 = COUNTER_READ ();
- new_thread_count = hill_climbing_update (counter._.max_working, sample_duration, completions, &threadpool->heuristic_adjustment_interval);
-
- COUNTER_ATOMIC (counter, { counter._.max_working = new_thread_count; });
-
- if (new_thread_count > counter._.max_working)
- worker_request (mono_domain_get ());
-
- threadpool->heuristic_sample_start = sample_end;
- threadpool->heuristic_last_adjustment = mono_msec_ticks ();
- }
-
- mono_coop_mutex_unlock (&threadpool->heuristic_lock);
- }
-}
-
-void
-mono_threadpool_ms_cleanup (void)
-{
-#ifndef DISABLE_SOCKETS
- mono_threadpool_ms_io_cleanup ();
-#endif
- mono_lazy_cleanup (&status, cleanup);
-}
-
-MonoAsyncResult *
-mono_threadpool_ms_begin_invoke (MonoDomain *domain, MonoObject *target, MonoMethod *method, gpointer *params, MonoError *error)
-{
- static MonoClass *async_call_klass = NULL;
- MonoMethodMessage *message;
- MonoAsyncResult *async_result;
- MonoAsyncCall *async_call;
- MonoDelegate *async_callback = NULL;
- MonoObject *state = NULL;
-
- if (!async_call_klass)
- async_call_klass = mono_class_load_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
-
- mono_lazy_initialize (&status, initialize);
-
- mono_error_init (error);
-
- message = mono_method_call_message_new (method, params, mono_get_delegate_invoke (method->klass), (params != NULL) ? (&async_callback) : NULL, (params != NULL) ? (&state) : NULL, error);
- return_val_if_nok (error, NULL);
-
- async_call = (MonoAsyncCall*) mono_object_new_checked (domain, async_call_klass, error);
- return_val_if_nok (error, NULL);
-
- MONO_OBJECT_SETREF (async_call, msg, message);
- MONO_OBJECT_SETREF (async_call, state, state);
-
- if (async_callback) {
- MONO_OBJECT_SETREF (async_call, cb_method, mono_get_delegate_invoke (((MonoObject*) async_callback)->vtable->klass));
- MONO_OBJECT_SETREF (async_call, cb_target, async_callback);
- }
-
- async_result = mono_async_result_new (domain, NULL, async_call->state, NULL, (MonoObject*) async_call, error);
- return_val_if_nok (error, NULL);
- MONO_OBJECT_SETREF (async_result, async_delegate, target);
-
- mono_threadpool_ms_enqueue_work_item (domain, (MonoObject*) async_result, error);
- return_val_if_nok (error, NULL);
-
- return async_result;
-}
-
-MonoObject *
-mono_threadpool_ms_end_invoke (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc, MonoError *error)
-{
- MonoAsyncCall *ac;
-
- mono_error_init (error);
- g_assert (exc);
- g_assert (out_args);
-
- *exc = NULL;
- *out_args = NULL;
-
- /* check if already finished */
- mono_monitor_enter ((MonoObject*) ares);
-
- if (ares->endinvoke_called) {
- mono_error_set_invalid_operation(error, "Delegate EndInvoke method called more than once");
- mono_monitor_exit ((MonoObject*) ares);
- return NULL;
- }
-
- ares->endinvoke_called = 1;
-
- /* wait until we are really finished */
- if (ares->completed) {
- mono_monitor_exit ((MonoObject *) ares);
- } else {
- gpointer wait_event;
- if (ares->handle) {
- wait_event = mono_wait_handle_get_handle ((MonoWaitHandle*) ares->handle);
- } else {
- wait_event = mono_w32event_create (TRUE, FALSE);
- g_assert(wait_event);
- MonoWaitHandle *wait_handle = mono_wait_handle_new (mono_object_domain (ares), wait_event, error);
- if (!is_ok (error)) {
- CloseHandle (wait_event);
- return NULL;
- }
- MONO_OBJECT_SETREF (ares, handle, (MonoObject*) wait_handle);
- }
- mono_monitor_exit ((MonoObject*) ares);
- MONO_ENTER_GC_SAFE;
-#ifdef HOST_WIN32
- WaitForSingleObjectEx (wait_event, INFINITE, TRUE);
-#else
- mono_w32handle_wait_one (wait_event, MONO_INFINITE_WAIT, TRUE);
-#endif
- MONO_EXIT_GC_SAFE;
- }
-
- ac = (MonoAsyncCall*) ares->object_data;
- g_assert (ac);
-
- *exc = ac->msg->exc; /* FIXME: GC add write barrier */
- *out_args = ac->out_args;
- return ac->res;
-}
-
-gboolean
-mono_threadpool_ms_remove_domain_jobs (MonoDomain *domain, int timeout)
-{
- gint64 end;
- ThreadPoolDomain *tpdomain;
- gboolean ret;
-
- g_assert (domain);
- g_assert (timeout >= -1);
-
- g_assert (mono_domain_is_unloading (domain));
-
- if (timeout != -1)
- end = mono_msec_ticks () + timeout;
-
-#ifndef DISABLE_SOCKETS
- mono_threadpool_ms_io_remove_domain_jobs (domain);
- if (timeout != -1) {
- if (mono_msec_ticks () > end)
- return FALSE;
- }
-#endif
-
- /*
- * Wait for all threads which execute jobs in the domain to exit.
- * The is_unloading () check in worker_request () ensures that
- * no new jobs are added after we enter the lock below.
- */
- mono_lazy_initialize (&status, initialize);
- domains_lock ();
-
- tpdomain = tpdomain_get (domain, FALSE);
- if (!tpdomain) {
- domains_unlock ();
- return TRUE;
- }
-
- ret = TRUE;
-
- while (tpdomain->outstanding_request + tpdomain->threadpool_jobs > 0) {
- if (timeout == -1) {
- mono_coop_cond_wait (&tpdomain->cleanup_cond, &threadpool->domains_lock);
- } else {
- gint64 now;
- gint res;
-
- now = mono_msec_ticks();
- if (now > end) {
- ret = FALSE;
- break;
- }
-
- res = mono_coop_cond_timedwait (&tpdomain->cleanup_cond, &threadpool->domains_lock, end - now);
- if (res != 0) {
- ret = FALSE;
- break;
- }
- }
- }
-
- /* Remove from the list the worker threads look at */
- tpdomain_remove (tpdomain);
-
- domains_unlock ();
-
- mono_coop_cond_destroy (&tpdomain->cleanup_cond);
- tpdomain_free (tpdomain);
-
- return ret;
-}
-
-void
-mono_threadpool_ms_suspend (void)
-{
- if (threadpool)
- threadpool->suspended = TRUE;
-}
-
-void
-mono_threadpool_ms_resume (void)
-{
- if (threadpool)
- threadpool->suspended = FALSE;
-}
-
-void
-ves_icall_System_Threading_ThreadPool_GetAvailableThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
-{
- ThreadPoolCounter counter;
-
- if (!worker_threads || !completion_port_threads)
- return;
-
- mono_lazy_initialize (&status, initialize);
-
- counter.as_gint64 = COUNTER_READ ();
-
- *worker_threads = MAX (0, threadpool->limit_worker_max - counter._.active);
- *completion_port_threads = threadpool->limit_io_max;
-}
-
-void
-ves_icall_System_Threading_ThreadPool_GetMinThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
-{
- if (!worker_threads || !completion_port_threads)
- return;
-
- mono_lazy_initialize (&status, initialize);
-
- *worker_threads = threadpool->limit_worker_min;
- *completion_port_threads = threadpool->limit_io_min;
-}
-
-void
-ves_icall_System_Threading_ThreadPool_GetMaxThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
-{
- if (!worker_threads || !completion_port_threads)
- return;
-
- mono_lazy_initialize (&status, initialize);
-
- *worker_threads = threadpool->limit_worker_max;
- *completion_port_threads = threadpool->limit_io_max;
-}
-
-MonoBoolean
-ves_icall_System_Threading_ThreadPool_SetMinThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
-{
- mono_lazy_initialize (&status, initialize);
-
- if (worker_threads <= 0 || worker_threads > threadpool->limit_worker_max)
- return FALSE;
- if (completion_port_threads <= 0 || completion_port_threads > threadpool->limit_io_max)
- return FALSE;
-
- threadpool->limit_worker_min = worker_threads;
- threadpool->limit_io_min = completion_port_threads;
-
- return TRUE;
-}
-
-MonoBoolean
-ves_icall_System_Threading_ThreadPool_SetMaxThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
-{
- gint cpu_count = mono_cpu_count ();
-
- mono_lazy_initialize (&status, initialize);
-
- if (worker_threads < threadpool->limit_worker_min || worker_threads < cpu_count)
- return FALSE;
- if (completion_port_threads < threadpool->limit_io_min || completion_port_threads < cpu_count)
- return FALSE;
-
- threadpool->limit_worker_max = worker_threads;
- threadpool->limit_io_max = completion_port_threads;
-
- return TRUE;
-}
-
-void
-ves_icall_System_Threading_ThreadPool_InitializeVMTp (MonoBoolean *enable_worker_tracking)
-{
- if (enable_worker_tracking) {
- // TODO implement some kind of switch to have the possibily to use it
- *enable_worker_tracking = FALSE;
- }
-
- mono_lazy_initialize (&status, initialize);
-}
-
-MonoBoolean
-ves_icall_System_Threading_ThreadPool_NotifyWorkItemComplete (void)
-{
- ThreadPoolCounter counter;
-
- if (mono_domain_is_unloading (mono_domain_get ()) || mono_runtime_is_shutting_down ())
- return FALSE;
-
- heuristic_notify_work_completed ();
-
- if (heuristic_should_adjust ())
- heuristic_adjust ();
-
- counter.as_gint64 = COUNTER_READ ();
- return counter._.working <= counter._.max_working;
-}
-
-void
-ves_icall_System_Threading_ThreadPool_NotifyWorkItemProgressNative (void)
-{
- heuristic_notify_work_completed ();
-
- if (heuristic_should_adjust ())
- heuristic_adjust ();
-}
-
-void
-ves_icall_System_Threading_ThreadPool_ReportThreadStatus (MonoBoolean is_working)
-{
- // TODO
- MonoError error;
- mono_error_set_not_implemented (&error, "");
- mono_error_set_pending_exception (&error);
-}
-
-MonoBoolean
-ves_icall_System_Threading_ThreadPool_RequestWorkerThread (void)
-{
- return worker_request (mono_domain_get ());
-}
-
-MonoBoolean G_GNUC_UNUSED
-ves_icall_System_Threading_ThreadPool_PostQueuedCompletionStatus (MonoNativeOverlapped *native_overlapped)
-{
- /* This copy the behavior of the current Mono implementation */
- MonoError error;
- mono_error_set_not_implemented (&error, "");
- mono_error_set_pending_exception (&error);
- return FALSE;
-}
-
-MonoBoolean G_GNUC_UNUSED
-ves_icall_System_Threading_ThreadPool_BindIOCompletionCallbackNative (gpointer file_handle)
-{
- /* This copy the behavior of the current Mono implementation */
- return TRUE;
-}
-
-MonoBoolean G_GNUC_UNUSED
-ves_icall_System_Threading_ThreadPool_IsThreadPoolHosted (void)
-{
- return FALSE;
-}