mono/metadata/threadpool.c

   1 /**
   2  * \file
   3  * Microsoft threadpool runtime support
   4  *
   5  * Author:
   6  *      Ludovic Henry (ludovic.henry@xamarin.com)
   7  *
   8  * Copyright 2015 Xamarin, Inc (http://www.xamarin.com)
   9  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
  10  */
  11
  12 //
  13 // Copyright (c) Microsoft. All rights reserved.
  14 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
  15 //
  16 // Files:
  17 //  - src/vm/comthreadpool.cpp
  18 //  - src/vm/win32threadpoolcpp
  19 //  - src/vm/threadpoolrequest.cpp
  20 //  - src/vm/hillclimbing.cpp
  21 //
  22 // Ported from C++ to C and adjusted to Mono runtime
  23
  24 #include <stdlib.h>
  25 #define _USE_MATH_DEFINES // needed by MSVC to define math constants
  26 #include <math.h>
  27 #include <config.h>
  28 #include <glib.h>
  29
  30 #include <mono/metadata/class-internals.h>
  31 #include <mono/metadata/exception.h>
  32 #include <mono/metadata/gc-internals.h>
  33 #include <mono/metadata/object.h>
  34 #include <mono/metadata/object-internals.h>
  35 #include <mono/metadata/threadpool.h>
  36 #include <mono/metadata/threadpool-worker.h>
  37 #include <mono/metadata/threadpool-io.h>
  38 #include <mono/metadata/w32event.h>
  39 #include <mono/utils/atomic.h>
  40 #include <mono/utils/mono-compiler.h>
  41 #include <mono/utils/mono-complex.h>
  42 #include <mono/utils/mono-lazy-init.h>
  43 #include <mono/utils/mono-logger.h>
  44 #include <mono/utils/mono-logger-internals.h>
  45 #include <mono/utils/mono-proclib.h>
  46 #include <mono/utils/mono-threads.h>
  47 #include <mono/utils/mono-time.h>
  48 #include <mono/utils/refcount.h>
  49
  50 typedef struct {
  51         MonoDomain *domain;
  52         /* Number of outstanding jobs */
  53         gint32 outstanding_request;
  54         /* Number of currently executing jobs */
  55         gint32 threadpool_jobs;
  56         /* Signalled when threadpool_jobs + outstanding_request is 0 */
  57         /* Protected by threadpool.domains_lock */
  58         MonoCoopCond cleanup_cond;
  59 } ThreadPoolDomain;
  60
  61 typedef union {
  62         struct {
  63                 gint16 starting; /* starting, but not yet in worker_callback */
  64                 gint16 working; /* executing worker_callback */
  65         } _;
  66         gint32 as_gint32;
  67 } ThreadPoolCounter;
  68
  69 typedef struct {
  70         MonoRefCount ref;
  71
  72         GPtrArray *domains; // ThreadPoolDomain* []
  73         MonoCoopMutex domains_lock;
  74
  75         ThreadPoolCounter counters;
  76
  77         gint32 limit_io_min;
  78         gint32 limit_io_max;
  79 } ThreadPool;
  80
  81 static mono_lazy_init_t status = MONO_LAZY_INIT_STATUS_NOT_INITIALIZED;
  82
  83 static ThreadPool threadpool;
  84
  85 #define COUNTER_ATOMIC(var,block) \
  86         do { \
  87                 ThreadPoolCounter __old; \
  88                 do { \
  89                         (var) = __old = COUNTER_READ (); \
  90                         { block; } \
  91                         if (!(counter._.starting >= 0)) \
  92                                 g_error ("%s: counter._.starting = %d, but should be >= 0", __func__, counter._.starting); \
  93                         if (!(counter._.working >= 0)) \
  94                                 g_error ("%s: counter._.working = %d, but should be >= 0", __func__, counter._.working); \
  95                 } while (InterlockedCompareExchange (&threadpool.counters.as_gint32, (var).as_gint32, __old.as_gint32) != __old.as_gint32); \
  96         } while (0)
  97
  98 static inline ThreadPoolCounter
  99 COUNTER_READ (void)
 100 {
 101         ThreadPoolCounter counter;
 102         counter.as_gint32 = InterlockedRead (&threadpool.counters.as_gint32);
 103         return counter;
 104 }
 105
 106 static inline void
 107 domains_lock (void)
 108 {
 109         mono_coop_mutex_lock (&threadpool.domains_lock);
 110 }
 111
 112 static inline void
 113 domains_unlock (void)
 114 {
 115         mono_coop_mutex_unlock (&threadpool.domains_lock);
 116 }
 117
 118 static void
 119 destroy (gpointer unused)
 120 {
 121         g_ptr_array_free (threadpool.domains, TRUE);
 122         mono_coop_mutex_destroy (&threadpool.domains_lock);
 123 }
 124
 125 static void
 126 initialize (void)
 127 {
 128         g_assert (sizeof (ThreadPoolCounter) == sizeof (gint32));
 129
 130         mono_refcount_init (&threadpool, destroy);
 131
 132         threadpool.domains = g_ptr_array_new ();
 133         mono_coop_mutex_init (&threadpool.domains_lock);
 134
 135         threadpool.limit_io_min = mono_cpu_count ();
 136         threadpool.limit_io_max = CLAMP (threadpool.limit_io_min * 100, MIN (threadpool.limit_io_min, 200), MAX (threadpool.limit_io_min, 200));
 137
 138         mono_threadpool_worker_init ();
 139 }
 140
 141 static void
 142 cleanup (void)
 143 {
 144         mono_threadpool_worker_cleanup ();
 145
 146         mono_refcount_dec (&threadpool);
 147 }
 148
 149 gboolean
 150 mono_threadpool_enqueue_work_item (MonoDomain *domain, MonoObject *work_item, MonoError *error)
 151 {
 152         static MonoClass *threadpool_class = NULL;
 153         static MonoMethod *unsafe_queue_custom_work_item_method = NULL;
 154         MonoDomain *current_domain;
 155         MonoBoolean f;
 156         gpointer args [2];
 157
 158         error_init (error);
 159         g_assert (work_item);
 160
 161         if (!threadpool_class)
 162                 threadpool_class = mono_class_load_from_name (mono_defaults.corlib, "System.Threading", "ThreadPool");
 163
 164         if (!unsafe_queue_custom_work_item_method)
 165                 unsafe_queue_custom_work_item_method = mono_class_get_method_from_name (threadpool_class, "UnsafeQueueCustomWorkItem", 2);
 166         g_assert (unsafe_queue_custom_work_item_method);
 167
 168         f = FALSE;
 169
 170         args [0] = (gpointer) work_item;
 171         args [1] = (gpointer) &f;
 172
 173         current_domain = mono_domain_get ();
 174         if (current_domain == domain) {
 175                 mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
 176                 return_val_if_nok (error, FALSE);
 177         } else {
 178                 mono_thread_push_appdomain_ref (domain);
 179                 if (mono_domain_set (domain, FALSE)) {
 180                         mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
 181                         if (!is_ok (error)) {
 182                                 mono_thread_pop_appdomain_ref ();
 183                                 return FALSE;
 184                         }
 185                         mono_domain_set (current_domain, TRUE);
 186                 }
 187                 mono_thread_pop_appdomain_ref ();
 188         }
 189         return TRUE;
 190 }
 191
 192 /* LOCKING: domains_lock must be held. */
 193 static ThreadPoolDomain *
 194 tpdomain_create (MonoDomain *domain)
 195 {
 196         ThreadPoolDomain *tpdomain;
 197
 198         tpdomain = g_new0 (ThreadPoolDomain, 1);
 199         tpdomain->domain = domain;
 200         mono_coop_cond_init (&tpdomain->cleanup_cond);
 201
 202         g_ptr_array_add (threadpool.domains, tpdomain);
 203
 204         return tpdomain;
 205 }
 206
 207 /* LOCKING: domains_lock must be held. */
 208 static gboolean
 209 tpdomain_remove (ThreadPoolDomain *tpdomain)
 210 {
 211         g_assert (tpdomain);
 212         return g_ptr_array_remove (threadpool.domains, tpdomain);
 213 }
 214
 215 /* LOCKING: domains_lock must be held */
 216 static ThreadPoolDomain *
 217 tpdomain_get (MonoDomain *domain)
 218 {
 219         gint i;
 220
 221         g_assert (domain);
 222
 223         for (i = 0; i < threadpool.domains->len; ++i) {
 224                 ThreadPoolDomain *tpdomain;
 225
 226                 tpdomain = (ThreadPoolDomain *)g_ptr_array_index (threadpool.domains, i);
 227                 if (tpdomain->domain == domain)
 228                         return tpdomain;
 229         }
 230
 231         return NULL;
 232 }
 233
 234 static void
 235 tpdomain_free (ThreadPoolDomain *tpdomain)
 236 {
 237         g_free (tpdomain);
 238 }
 239
 240 /* LOCKING: domains_lock must be held */
 241 static ThreadPoolDomain *
 242 tpdomain_get_next (ThreadPoolDomain *current)
 243 {
 244         ThreadPoolDomain *tpdomain = NULL;
 245         gint len;
 246
 247         len = threadpool.domains->len;
 248         if (len > 0) {
 249                 gint i, current_idx = -1;
 250                 if (current) {
 251                         for (i = 0; i < len; ++i) {
 252                                 if (current == g_ptr_array_index (threadpool.domains, i)) {
 253                                         current_idx = i;
 254                                         break;
 255                                 }
 256                         }
 257                 }
 258                 for (i = current_idx + 1; i < len + current_idx + 1; ++i) {
 259                         ThreadPoolDomain *tmp = (ThreadPoolDomain *)g_ptr_array_index (threadpool.domains, i % len);
 260                         if (tmp->outstanding_request > 0) {
 261                                 tpdomain = tmp;
 262                                 break;
 263                         }
 264                 }
 265         }
 266
 267         return tpdomain;
 268 }
 269
 270 static MonoObject*
 271 try_invoke_perform_wait_callback (MonoObject** exc, MonoError *error)
 272 {
 273         HANDLE_FUNCTION_ENTER ();
 274         error_init (error);
 275         MonoObject *res = mono_runtime_try_invoke (mono_defaults.threadpool_perform_wait_callback_method, NULL, NULL, exc, error);
 276         HANDLE_FUNCTION_RETURN_VAL (res);
 277 }
 278
 279 static void
 280 worker_callback (gpointer unused)
 281 {
 282         MonoError error;
 283         ThreadPoolDomain *tpdomain, *previous_tpdomain;
 284         ThreadPoolCounter counter;
 285         MonoInternalThread *thread;
 286
 287         if (!mono_refcount_tryinc (&threadpool))
 288                 return;
 289
 290         thread = mono_thread_internal_current ();
 291
 292         COUNTER_ATOMIC (counter, {
 293                 if (!(counter._.working < 32767 /* G_MAXINT16 */))
 294                         g_error ("%s: counter._.working = %d, but should be < 32767", __func__, counter._.working);
 295
 296                 counter._.starting --;
 297                 counter._.working ++;
 298         });
 299
 300         if (mono_runtime_is_shutting_down ()) {
 301                 COUNTER_ATOMIC (counter, {
 302                         counter._.working --;
 303                 });
 304
 305                 mono_refcount_dec (&threadpool);
 306                 return;
 307         }
 308
 309         /*
 310          * This is needed so there is always an lmf frame in the runtime invoke call below,
 311          * so ThreadAbortExceptions are caught even if the thread is in native code.
 312          */
 313         mono_defaults.threadpool_perform_wait_callback_method->save_lmf = TRUE;
 314
 315         domains_lock ();
 316
 317         previous_tpdomain = NULL;
 318
 319         while (!mono_runtime_is_shutting_down ()) {
 320                 gboolean retire = FALSE;
 321
 322                 if (thread->state & (ThreadState_AbortRequested | ThreadState_SuspendRequested)) {
 323                         domains_unlock ();
 324                         if (mono_thread_interruption_checkpoint ()) {
 325                                 domains_lock ();
 326                                 continue;
 327                         }
 328                         domains_lock ();
 329                 }
 330
 331                 tpdomain = tpdomain_get_next (previous_tpdomain);
 332                 if (!tpdomain)
 333                         break;
 334
 335                 tpdomain->outstanding_request --;
 336                 g_assert (tpdomain->outstanding_request >= 0);
 337
 338                 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] worker running in domain %p (outstanding requests %d)",
 339                         mono_native_thread_id_get (), tpdomain->domain, tpdomain->outstanding_request);
 340
 341                 g_assert (tpdomain->threadpool_jobs >= 0);
 342                 tpdomain->threadpool_jobs ++;
 343
 344                 domains_unlock ();
 345
 346                 mono_thread_set_name_internal (thread, mono_string_new (mono_get_root_domain (), "Threadpool worker"), FALSE, TRUE, &error);
 347                 mono_error_assert_ok (&error);
 348
 349                 mono_thread_clr_state (thread, (MonoThreadState)~ThreadState_Background);
 350                 if (!mono_thread_test_state (thread , ThreadState_Background))
 351                         ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background);
 352
 353                 mono_thread_push_appdomain_ref (tpdomain->domain);
 354                 if (mono_domain_set (tpdomain->domain, FALSE)) {
 355                         MonoObject *exc = NULL, *res;
 356
 357                         res = try_invoke_perform_wait_callback (&exc, &error);
 358                         if (exc || !mono_error_ok(&error)) {
 359                                 if (exc == NULL)
 360                                         exc = (MonoObject *) mono_error_convert_to_exception (&error);
 361                                 else
 362                                         mono_error_cleanup (&error);
 363                                 mono_thread_internal_unhandled_exception (exc);
 364                         } else if (res && *(MonoBoolean*) mono_object_unbox (res) == FALSE) {
 365                                 retire = TRUE;
 366                         }
 367
 368                         mono_domain_set (mono_get_root_domain (), TRUE);
 369                 }
 370                 mono_thread_pop_appdomain_ref ();
 371
 372                 domains_lock ();
 373
 374                 tpdomain->threadpool_jobs --;
 375                 g_assert (tpdomain->threadpool_jobs >= 0);
 376
 377                 if (tpdomain->outstanding_request + tpdomain->threadpool_jobs == 0 && mono_domain_is_unloading (tpdomain->domain)) {
 378                         gboolean removed;
 379
 380                         removed = tpdomain_remove (tpdomain);
 381                         g_assert (removed);
 382
 383                         mono_coop_cond_signal (&tpdomain->cleanup_cond);
 384                         tpdomain = NULL;
 385                 }
 386
 387                 if (retire)
 388                         break;
 389
 390                 previous_tpdomain = tpdomain;
 391         }
 392
 393         domains_unlock ();
 394
 395         COUNTER_ATOMIC (counter, {
 396                 counter._.working --;
 397         });
 398
 399         mono_refcount_dec (&threadpool);
 400 }
 401
 402 void
 403 mono_threadpool_cleanup (void)
 404 {
 405 #ifndef DISABLE_SOCKETS
 406         mono_threadpool_io_cleanup ();
 407 #endif
 408         mono_lazy_cleanup (&status, cleanup);
 409 }
 410
 411 MonoAsyncResult *
 412 mono_threadpool_begin_invoke (MonoDomain *domain, MonoObject *target, MonoMethod *method, gpointer *params, MonoError *error)
 413 {
 414         static MonoClass *async_call_klass = NULL;
 415         MonoMethodMessage *message;
 416         MonoAsyncResult *async_result;
 417         MonoAsyncCall *async_call;
 418         MonoDelegate *async_callback = NULL;
 419         MonoObject *state = NULL;
 420
 421         if (!async_call_klass)
 422                 async_call_klass = mono_class_load_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
 423
 424         error_init (error);
 425
 426         message = mono_method_call_message_new (method, params, mono_get_delegate_invoke (method->klass), (params != NULL) ? (&async_callback) : NULL, (params != NULL) ? (&state) : NULL, error);
 427         return_val_if_nok (error, NULL);
 428
 429         async_call = (MonoAsyncCall*) mono_object_new_checked (domain, async_call_klass, error);
 430         return_val_if_nok (error, NULL);
 431
 432         MONO_OBJECT_SETREF (async_call, msg, message);
 433         MONO_OBJECT_SETREF (async_call, state, state);
 434
 435         if (async_callback) {
 436                 MONO_OBJECT_SETREF (async_call, cb_method, mono_get_delegate_invoke (((MonoObject*) async_callback)->vtable->klass));
 437                 MONO_OBJECT_SETREF (async_call, cb_target, async_callback);
 438         }
 439
 440         async_result = mono_async_result_new (domain, NULL, async_call->state, NULL, (MonoObject*) async_call, error);
 441         return_val_if_nok (error, NULL);
 442         MONO_OBJECT_SETREF (async_result, async_delegate, target);
 443
 444         mono_threadpool_enqueue_work_item (domain, (MonoObject*) async_result, error);
 445         return_val_if_nok (error, NULL);
 446
 447         return async_result;
 448 }
 449
 450 MonoObject *
 451 mono_threadpool_end_invoke (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc, MonoError *error)
 452 {
 453         MonoAsyncCall *ac;
 454
 455         error_init (error);
 456         g_assert (exc);
 457         g_assert (out_args);
 458
 459         *exc = NULL;
 460         *out_args = NULL;
 461
 462         /* check if already finished */
 463         mono_monitor_enter ((MonoObject*) ares);
 464
 465         if (ares->endinvoke_called) {
 466                 mono_error_set_invalid_operation(error, "Delegate EndInvoke method called more than once");
 467                 mono_monitor_exit ((MonoObject*) ares);
 468                 return NULL;
 469         }
 470
 471         ares->endinvoke_called = 1;
 472
 473         /* wait until we are really finished */
 474         if (ares->completed) {
 475                 mono_monitor_exit ((MonoObject *) ares);
 476         } else {
 477                 gpointer wait_event;
 478                 if (ares->handle) {
 479                         wait_event = mono_wait_handle_get_handle ((MonoWaitHandle*) ares->handle);
 480                 } else {
 481                         wait_event = mono_w32event_create (TRUE, FALSE);
 482                         g_assert(wait_event);
 483                         MonoWaitHandle *wait_handle = mono_wait_handle_new (mono_object_domain (ares), wait_event, error);
 484                         if (!is_ok (error)) {
 485                                 mono_w32event_close (wait_event);
 486                                 return NULL;
 487                         }
 488                         MONO_OBJECT_SETREF (ares, handle, (MonoObject*) wait_handle);
 489                 }
 490                 mono_monitor_exit ((MonoObject*) ares);
 491                 MONO_ENTER_GC_SAFE;
 492 #ifdef HOST_WIN32
 493                 WaitForSingleObjectEx (wait_event, INFINITE, TRUE);
 494 #else
 495                 mono_w32handle_wait_one (wait_event, MONO_INFINITE_WAIT, TRUE);
 496 #endif
 497                 MONO_EXIT_GC_SAFE;
 498         }
 499
 500         ac = (MonoAsyncCall*) ares->object_data;
 501         g_assert (ac);
 502
 503         *exc = ac->msg->exc; /* FIXME: GC add write barrier */
 504         *out_args = ac->out_args;
 505         return ac->res;
 506 }
 507
 508 gboolean
 509 mono_threadpool_remove_domain_jobs (MonoDomain *domain, int timeout)
 510 {
 511         gint64 end;
 512         ThreadPoolDomain *tpdomain;
 513         gboolean ret;
 514
 515         g_assert (domain);
 516         g_assert (timeout >= -1);
 517
 518         g_assert (mono_domain_is_unloading (domain));
 519
 520         if (timeout != -1)
 521                 end = mono_msec_ticks () + timeout;
 522
 523 #ifndef DISABLE_SOCKETS
 524         mono_threadpool_io_remove_domain_jobs (domain);
 525         if (timeout != -1) {
 526                 if (mono_msec_ticks () > end)
 527                         return FALSE;
 528         }
 529 #endif
 530
 531         /*
 532          * Wait for all threads which execute jobs in the domain to exit.
 533          * The is_unloading () check in worker_request () ensures that
 534          * no new jobs are added after we enter the lock below.
 535          */
 536
 537         if (!mono_lazy_is_initialized (&status))
 538                 return TRUE;
 539
 540         mono_refcount_inc (&threadpool);
 541
 542         domains_lock ();
 543
 544         tpdomain = tpdomain_get (domain);
 545         if (!tpdomain) {
 546                 domains_unlock ();
 547                 mono_refcount_dec (&threadpool);
 548                 return TRUE;
 549         }
 550
 551         ret = TRUE;
 552
 553         while (tpdomain->outstanding_request + tpdomain->threadpool_jobs > 0) {
 554                 if (timeout == -1) {
 555                         mono_coop_cond_wait (&tpdomain->cleanup_cond, &threadpool.domains_lock);
 556                 } else {
 557                         gint64 now;
 558                         gint res;
 559
 560                         now = mono_msec_ticks();
 561                         if (now > end) {
 562                                 ret = FALSE;
 563                                 break;
 564                         }
 565
 566                         res = mono_coop_cond_timedwait (&tpdomain->cleanup_cond, &threadpool.domains_lock, end - now);
 567                         if (res != 0) {
 568                                 ret = FALSE;
 569                                 break;
 570                         }
 571                 }
 572         }
 573
 574         /* Remove from the list the worker threads look at */
 575         tpdomain_remove (tpdomain);
 576
 577         domains_unlock ();
 578
 579         mono_coop_cond_destroy (&tpdomain->cleanup_cond);
 580         tpdomain_free (tpdomain);
 581
 582         mono_refcount_dec (&threadpool);
 583
 584         return ret;
 585 }
 586
 587 void
 588 mono_threadpool_suspend (void)
 589 {
 590         if (mono_lazy_is_initialized (&status))
 591                 mono_threadpool_worker_set_suspended (TRUE);
 592 }
 593
 594 void
 595 mono_threadpool_resume (void)
 596 {
 597         if (mono_lazy_is_initialized (&status))
 598                 mono_threadpool_worker_set_suspended (FALSE);
 599 }
 600
 601 void
 602 ves_icall_System_Threading_ThreadPool_GetAvailableThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 603 {
 604         ThreadPoolCounter counter;
 605
 606         if (!worker_threads || !completion_port_threads)
 607                 return;
 608
 609         if (!mono_lazy_initialize (&status, initialize) || !mono_refcount_tryinc (&threadpool)) {
 610                 *worker_threads = 0;
 611                 *completion_port_threads = 0;
 612                 return;
 613         }
 614
 615         counter = COUNTER_READ ();
 616
 617         *worker_threads = MAX (0, mono_threadpool_worker_get_max () - counter._.working);
 618         *completion_port_threads = threadpool.limit_io_max;
 619
 620         mono_refcount_dec (&threadpool);
 621 }
 622
 623 void
 624 ves_icall_System_Threading_ThreadPool_GetMinThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 625 {
 626         if (!worker_threads || !completion_port_threads)
 627                 return;
 628
 629         if (!mono_lazy_initialize (&status, initialize) || !mono_refcount_tryinc (&threadpool)) {
 630                 *worker_threads = 0;
 631                 *completion_port_threads = 0;
 632                 return;
 633         }
 634
 635         *worker_threads = mono_threadpool_worker_get_min ();
 636         *completion_port_threads = threadpool.limit_io_min;
 637
 638         mono_refcount_dec (&threadpool);
 639 }
 640
 641 void
 642 ves_icall_System_Threading_ThreadPool_GetMaxThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 643 {
 644         if (!worker_threads || !completion_port_threads)
 645                 return;
 646
 647         if (!mono_lazy_initialize (&status, initialize) || !mono_refcount_tryinc (&threadpool)) {
 648                 *worker_threads = 0;
 649                 *completion_port_threads = 0;
 650                 return;
 651         }
 652
 653         *worker_threads = mono_threadpool_worker_get_max ();
 654         *completion_port_threads = threadpool.limit_io_max;
 655
 656         mono_refcount_dec (&threadpool);
 657 }
 658
 659 MonoBoolean
 660 ves_icall_System_Threading_ThreadPool_SetMinThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
 661 {
 662         if (completion_port_threads <= 0 || completion_port_threads > threadpool.limit_io_max)
 663                 return FALSE;
 664
 665         if (!mono_lazy_initialize (&status, initialize) || !mono_refcount_tryinc (&threadpool))
 666                 return FALSE;
 667
 668         if (!mono_threadpool_worker_set_min (worker_threads)) {
 669                 mono_refcount_dec (&threadpool);
 670                 return FALSE;
 671         }
 672
 673         threadpool.limit_io_min = completion_port_threads;
 674
 675         mono_refcount_dec (&threadpool);
 676         return TRUE;
 677 }
 678
 679 MonoBoolean
 680 ves_icall_System_Threading_ThreadPool_SetMaxThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
 681 {
 682         gint cpu_count = mono_cpu_count ();
 683
 684         if (completion_port_threads < threadpool.limit_io_min || completion_port_threads < cpu_count)
 685                 return FALSE;
 686
 687         if (!mono_lazy_initialize (&status, initialize) || !mono_refcount_tryinc (&threadpool))
 688                 return FALSE;
 689
 690         if (!mono_threadpool_worker_set_max (worker_threads)) {
 691                 mono_refcount_dec (&threadpool);
 692                 return FALSE;
 693         }
 694
 695         threadpool.limit_io_max = completion_port_threads;
 696
 697         mono_refcount_dec (&threadpool);
 698         return TRUE;
 699 }
 700
 701 void
 702 ves_icall_System_Threading_ThreadPool_InitializeVMTp (MonoBoolean *enable_worker_tracking)
 703 {
 704         if (enable_worker_tracking) {
 705                 // TODO implement some kind of switch to have the possibily to use it
 706                 *enable_worker_tracking = FALSE;
 707         }
 708
 709         mono_lazy_initialize (&status, initialize);
 710 }
 711
 712 MonoBoolean
 713 ves_icall_System_Threading_ThreadPool_NotifyWorkItemComplete (void)
 714 {
 715         if (mono_domain_is_unloading (mono_domain_get ()) || mono_runtime_is_shutting_down ())
 716                 return FALSE;
 717
 718         return mono_threadpool_worker_notify_completed ();
 719 }
 720
 721 void
 722 ves_icall_System_Threading_ThreadPool_NotifyWorkItemProgressNative (void)
 723 {
 724         mono_threadpool_worker_notify_completed ();
 725 }
 726
 727 void
 728 ves_icall_System_Threading_ThreadPool_ReportThreadStatus (MonoBoolean is_working)
 729 {
 730         // TODO
 731         MonoError error;
 732         mono_error_set_not_implemented (&error, "");
 733         mono_error_set_pending_exception (&error);
 734 }
 735
 736 MonoBoolean
 737 ves_icall_System_Threading_ThreadPool_RequestWorkerThread (void)
 738 {
 739         MonoDomain *domain;
 740         ThreadPoolDomain *tpdomain;
 741         ThreadPoolCounter counter;
 742
 743         domain = mono_domain_get ();
 744         if (mono_domain_is_unloading (domain))
 745                 return FALSE;
 746
 747         if (!mono_lazy_initialize (&status, initialize) || !mono_refcount_tryinc (&threadpool)) {
 748                 /* threadpool has been destroyed, we are shutting down */
 749                 return FALSE;
 750         }
 751
 752         domains_lock ();
 753
 754         tpdomain = tpdomain_get (domain);
 755         if (!tpdomain) {
 756                 /* synchronize with mono_threadpool_remove_domain_jobs */
 757                 if (mono_domain_is_unloading (domain)) {
 758                         domains_unlock ();
 759                         mono_refcount_dec (&threadpool);
 760                         return FALSE;
 761                 }
 762
 763                 tpdomain = tpdomain_create (domain);
 764         }
 765
 766         g_assert (tpdomain);
 767
 768         tpdomain->outstanding_request ++;
 769         g_assert (tpdomain->outstanding_request >= 1);
 770
 771         domains_unlock ();
 772
 773         COUNTER_ATOMIC (counter, {
 774                 if (counter._.starting == 16) {
 775                         mono_refcount_dec (&threadpool);
 776                         return TRUE;
 777                 }
 778
 779                 counter._.starting ++;
 780         });
 781
 782         mono_threadpool_worker_enqueue (worker_callback, NULL);
 783
 784         mono_refcount_dec (&threadpool);
 785         return TRUE;
 786 }
 787
 788 MonoBoolean G_GNUC_UNUSED
 789 ves_icall_System_Threading_ThreadPool_PostQueuedCompletionStatus (MonoNativeOverlapped *native_overlapped)
 790 {
 791         /* This copy the behavior of the current Mono implementation */
 792         MonoError error;
 793         mono_error_set_not_implemented (&error, "");
 794         mono_error_set_pending_exception (&error);
 795         return FALSE;
 796 }
 797
 798 MonoBoolean G_GNUC_UNUSED
 799 ves_icall_System_Threading_ThreadPool_BindIOCompletionCallbackNative (gpointer file_handle)
 800 {
 801         /* This copy the behavior of the current Mono implementation */
 802         return TRUE;
 803 }
 804
 805 MonoBoolean G_GNUC_UNUSED
 806 ves_icall_System_Threading_ThreadPool_IsThreadPoolHosted (void)
 807 {
 808         return FALSE;
 809 }